CN120280861B - Reactor turn-to-turn fault protection method and system for tracking voltage and current change trend - Google Patents
Reactor turn-to-turn fault protection method and system for tracking voltage and current change trendInfo
- Publication number
- CN120280861B CN120280861B CN202510764967.5A CN202510764967A CN120280861B CN 120280861 B CN120280861 B CN 120280861B CN 202510764967 A CN202510764967 A CN 202510764967A CN 120280861 B CN120280861 B CN 120280861B
- Authority
- CN
- China
- Prior art keywords
- effective value
- turn
- condition
- current
- positive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/02—Measuring effective values, i.e. root-mean-square values
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/56—Testing of electric apparatus
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a method and a system for protecting a turn-to-turn fault of a reactor for tracking a voltage and current change trend, which relate to the technical field of relay protection of power systems and comprise the steps of collecting voltage sampling point data and current sampling point data of a reactor protection device side based on preset frequency; based on the voltage sampling point data and the current sampling point data, calculating a positive sequence voltage effective value, a three-phase current effective value, a positive sequence current effective value and a negative sequence current effective value, judging whether an inter-turn protection starting condition, an inter-turn protection action condition and an inter-turn protection current change trend condition are met, and controlling the action of the reactor protection device if the inter-turn protection starting condition, the inter-turn protection action condition and the inter-turn protection current change trend condition are met within a preset sampling time. The invention relieves the technical problem that the reactor is possibly damaged due to slow action of the relay protection device when the turn-to-turn fault of the 35kV reactor exists in the prior art.
Description
Technical Field
The invention relates to the technical field of relay protection of power systems, in particular to a method and a system for protecting inter-turn faults of a reactor for tracking voltage and current change trend.
Background
The 35kV reactor is an important device in a 35KV power system, and is mainly used for regulating current, limiting short-circuit faults, inhibiting harmonic waves and improving the stability of the power system, and the device is widely applied to the power system. As the winding insulation (e.g., epoxy, paper insulation) ages or deteriorates due to long term operation or overload of the reactor, the reactor equipment may cause turn-to-turn protection failure. During the turn-to-turn fault of the reactor, the fault current is gradually increased, the temperature of the lead is gradually increased, insulating materials are ignited, and finally the reactor is ignited and burnt.
The inter-turn fault of the reactor at the current stage is realized by adopting a zero-sequence impedance principle, but a 35kV power system adopts a non-grounding system, so that the inter-turn protection of the reactor by adopting the zero-sequence impedance principle is not applicable to the 35kV reactor, and in addition, the 35kV reactor usually adopts overcurrent protection to realize inter-turn fault tripping, but when the overcurrent protection is in delayed action, the delay is set according to hundred milliseconds, during which the slight inter-turn fault of the reactor can be developed into serious fault, and the overcurrent protection can not timely isolate the fault and protect primary equipment.
Disclosure of Invention
The invention aims to solve at least one technical problem, and provides a reactor turn-to-turn fault protection method and system for tracking voltage and current variation trend.
According to the method, whether an inter-turn protection starting condition is met or not is judged based on the ratio of the positive sequence voltage effective value to the negative sequence current effective value to the positive sequence current effective value, whether an inter-turn protection starting condition is met or not is judged based on the change trend of the positive sequence voltage effective value, whether an inter-turn protection action condition is met or not is judged based on the ratio of the positive sequence current effective value to the positive sequence current effective value, and whether the inter-turn protection action condition is met or not is judged based on the ratio of the positive sequence current effective value to the negative sequence current effective value to the positive sequence current effective value.
Further, positive sequence voltage effective values, three-phase current effective values, positive sequence current effective values and negative sequence current effective values are calculated based on the voltage sampling point data and the current sampling point data, and the positive sequence voltage effective values, the three-phase current effective values, the positive sequence current effective values and the negative sequence current effective values are calculated based on the voltage vector data and the current vector data.
The inter-turn protection starting condition comprises a positive sequence voltage condition, a three-phase current condition and a ratio condition, wherein the positive sequence voltage condition comprises that the positive sequence voltage effective value is larger than a first preset voltage threshold value, the three-phase current condition comprises that the three-phase current effective values are all larger than a preset no-current threshold value, and the ratio condition comprises that the ratio of the negative sequence current effective value to the positive sequence current effective value is larger than a preset sensitivity coefficient.
Further, judging whether an inter-turn protection starting condition is met or not based on the positive sequence voltage effective value, the three-phase current effective value and the ratio of the negative sequence current effective value to the positive sequence current effective value comprises judging whether the positive sequence voltage condition, the three-phase current condition and the ratio condition are met or not based on the positive sequence voltage effective value, the three-phase current effective value and the ratio of the negative sequence current effective value to the positive sequence current effective value, and judging that the inter-turn protection starting condition is met if yes.
Further, based on the change trend of the positive sequence voltage effective value, judging whether an inter-turn protection action condition is met or not, wherein the judgment comprises judging whether the absolute value of the difference value between the positive sequence voltage effective value corresponding to the current cycle and the positive sequence voltage effective value corresponding to the historical cycle is smaller than a second preset voltage threshold value or not, and if so, judging that the inter-turn protection action condition is met.
The inter-turn protection current change trend condition comprises a phase current change trend condition, a negative sequence current change trend condition, a positive sequence current change trend condition and a ratio change trend condition, wherein the phase current change trend condition comprises that the change trend of at least one phase current effective value in the three-phase current effective values is an increasing trend, the negative sequence current change trend condition comprises that the change trend of the negative sequence current effective values is an increasing trend, the positive sequence current change trend condition comprises that the change trend of the positive sequence current effective values is an increasing trend, and the ratio change trend condition comprises that the change trend of the ratio of the negative sequence current effective values to the positive sequence current effective values is an increasing trend.
Further, judging whether inter-turn protection current change trend conditions are met or not based on the three-phase current effective value, the negative sequence current effective value, the positive sequence current effective value and the ratio of the negative sequence current effective value to the positive sequence current effective value, wherein judging whether the phase current change trend conditions, the negative sequence current change trend conditions, the positive sequence current change trend conditions and the ratio change trend conditions are met or not based on the three-phase current effective value, the negative sequence current effective value, the positive sequence current effective value and the ratio of the negative sequence current effective value to the positive sequence current effective value, and judging that the inter-turn protection current change trend conditions are met if yes.
The embodiment of the invention further provides a reactor turn-to-turn fault protection system for tracking a voltage and current change trend, which is applied to a reactor protection device of a 35kV power system, and comprises a sampling module, a calculating module, a first judging module, a second judging module, a third judging module and a protection module, wherein the sampling module is used for collecting voltage sampling point data and current sampling point data on the side of the reactor protection device based on a preset frequency, the calculating module is used for calculating a positive-sequence voltage effective value, a three-phase current effective value, a positive-sequence current effective value and a negative-sequence current effective value based on the voltage sampling point data and the current sampling point data, the first judging module is used for judging whether an inter-turn protection starting condition is met or not based on the ratio of the positive-sequence voltage effective value, the three-phase current effective value and the negative-sequence current effective value, the second judging module is used for judging whether an inter-turn protection action condition is met or not based on the change of the positive-sequence voltage effective value, the third judging module is used for controlling the inter-turn protection device based on the three-phase current effective value and the current effective value, and the current ratio of the positive-sequence current effective value, and the current effective value meets the inter-turn protection condition.
In a third aspect, the embodiment of the invention also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the computer program to realize the method provided by the embodiment of the invention.
In a fourth aspect, embodiments of the present invention also provide a computer readable storage medium storing computer instructions that, when executed by a processor, implement a method as provided by embodiments of the present invention.
The invention provides a method and a system for protecting inter-turn faults of a reactor, which can be used for tracking the voltage and current change trend, increasing the action delay of the inter-turn faults of a 35kV reactor from hundred milliseconds to ten milliseconds, effectively reducing the duration of the inter-turn faults of the reactor, avoiding the risk of burning the reactor, prolonging the service life of the reactor equipment, effectively judging slight inter-turn protection faults by adopting a sensitive starting coefficient of the ratio of negative sequence current to positive sequence current in the judging process, and simultaneously, effectively and quickly identifying the inter-turn faults of the 35kV reactor by adopting the judgment of tracking the positive sequence voltage change trend and the current change trend, and improving the protection sensitivity of the reactor. The invention relieves the technical problem that the reactor is possibly damaged due to slow action of the relay protection device when the turn-to-turn fault of the 35kV reactor exists in the prior art.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are needed in the detailed description of the embodiments and the prior art will be briefly described below, it being obvious that the drawings in the following description are some embodiments of the application and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a reactor turn-to-turn fault protection method for tracking voltage and current variation trends according to an embodiment of the present invention;
Fig. 2 is a schematic diagram of a reactor turn-to-turn fault protection system for tracking voltage and current variation trends according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Fig. 1 is a flowchart of a reactor turn-to-turn fault protection method for tracking voltage and current variation trend, which is applied to a reactor protection device of a 35kV power system. As shown in fig. 1, the method specifically includes the following steps:
Step S102, voltage sampling point data and current sampling point data of the reactor protection device side are collected based on a preset frequency.
Step S104, calculating positive sequence voltage effective values, three-phase current effective values, positive sequence current effective values and negative sequence current effective values based on the voltage sampling point data and the current sampling point data.
And S106, judging whether the turn-to-turn protection starting condition is met or not based on the positive sequence voltage effective value, the three-phase current effective value and the ratio of the negative sequence current effective value to the positive sequence current effective value.
Step S108, judging whether the turn-to-turn protection action condition is met or not based on the change trend of the positive-sequence voltage effective value.
Step S110, judging whether the inter-turn protection current change trend condition is met or not based on the three-phase current effective value, the negative sequence current effective value, the positive sequence current effective value and the ratio of the negative sequence current effective value to the positive sequence current effective value.
And step S112, if the inter-turn protection starting condition, the inter-turn protection action condition and the inter-turn protection current change trend condition are all met within the preset sampling time, controlling the reactor protection device to act.
Specifically, step S104 further includes the steps of:
Step S1041, converting the voltage sampling point data and the current sampling point data into voltage vector data and current vector data respectively by a full-cycle Fourier algorithm;
step S1042, calculating positive sequence voltage effective value, three-phase current effective value, positive sequence current effective value and negative sequence current effective value based on the voltage vector data and the current vector data.
Specifically, the full-cycle vector value represents the formula:
wherein, the Representing the value of the full-cycle vector,For the real part of the vector value, i represents an imaginary unit, and the calculation formula is as follows:
Im is the imaginary part of the vector value and its calculation formula is as follows:
the vector value effective value calculation formula is as follows:
In the above formula (2) and formula (3): for the sampling point array, j represents the sampling point array number, N represents the sampling point number of one cycle, and the definition of N is the same as that of the latter.
Optionally, n=24, i.e. the number of points of the weekly wave sampling point control is 24.
Through formulas (1) - (3) and voltage sampling point dataData of current sampling pointRespectively calculating voltage vector dataAnd current vector data. Wherein, the For phase, a phase or b phase or c phase is included.
Then, the positive sequence voltage vector value is calculated by the formula (4), the formula (5) and the formula (6)Positive sequence current vector valueAnd negative sequence current vector value:
The positive sequence voltage vector value to be used in the invention is obtained through the vector value calculationPositive sequence current vector valueNegative sequence current vector valueAnd three-phase current vector value。
Calculating effective values corresponding to the voltage vector values and the current vector values through a formula (4):
Calculating positive sequence voltage effective value and recording to positive sequence voltage array corresponding to current sampling point n The positive sequence current effective value is recorded to a positive sequence current array corresponding to the current sampling point nThe negative sequence current effective value is recorded to a negative sequence current array corresponding to the current sampling point nThree-phase current effective valueAnd records the positive sequence current array corresponding to the current sampling point nThe ratio of the negative sequence current effective value to the positive sequence current effective valueAnd record to the corresponding array。
Specifically, the turn-to-turn protection starting conditions comprise a positive sequence voltage condition, a three-phase current condition and a ratio condition, wherein,
(1) The positive sequence voltage condition includes that the positive sequence voltage effective value is larger than a first preset voltage threshold. For example, if the first preset voltage threshold is 0.95 times the rated voltage, the positive sequence voltage condition is determined as follows:
Current positive sequence voltage effective value Is greater than 0.95 times rated voltage。
(2) The three-phase current condition comprises that the three-phase current effective values are all larger than a preset no-current threshold value. Specifically, the discriminant is as follows:
the current three-phase current effective values are all larger than a preset no-current threshold value (E.g., a preset no-current threshold of 0.04 times rated current):。
(3) The ratio condition comprises that the ratio of the effective value of the negative sequence current to the effective value of the positive sequence current is larger than a preset sensitivity coefficient. Specifically, the discriminant is as follows:
Negative sequence current effective value And positive sequence current effective valueRatio ofIs greater than a preset sensitivity coefficient(E.g.,Taking a number between 0.05 and 0.1):。
Sensitivity coefficient The value has a direct relation with the severity of the turn-to-turn fault. The inter-turn fault of the reactor is developed from a slight inter-turn fault to a serious inter-turn fault whenThe smaller the value, the earlier the inter-turn fault can be found in the process from slight to severe, in the embodiment of the invention, in order to ensure the sensitivity of inter-turn fault identification,The value is 0.05, so that the method can be started in time in the process of developing the turn-to-turn slight fault to the moderate fault, and the sensitivity of turn-to-turn protection is ensured.
I.e. ratio condition of。
Specifically, step S106 includes:
judging whether the positive sequence voltage condition, the three-phase current condition and the ratio condition are all met or not based on the positive sequence voltage effective value, the three-phase current effective value and the ratio of the negative sequence current effective value to the positive sequence current effective value;
If yes, judging that the turn-to-turn protection starting condition is met.
Specifically, the discriminant of the turn-to-turn protection starting condition is as follows:
If the discriminant is satisfied, the inter-turn protection starting condition is satisfied, otherwise, the inter-turn protection action delay is set to 0.
Specifically, step S108 includes the steps of:
judging whether the absolute value of the difference value between the positive sequence voltage effective value corresponding to the current cycle and the positive sequence voltage effective value corresponding to the historical cycle is smaller than a second preset voltage threshold value or not;
If yes, judging that the turn-to-turn protection action condition is met.
Optionally, the second preset voltage threshold is 0.02 times the rated voltage value Un.
Specifically, the process from the turn-to-turn fault of the 35kV reactor to the burnout of the reactor has a period of time, which is at least hundreds of milliseconds, during which the voltage of the reactor is basically unchanged and is maintained at the level of the system voltage, and the voltage cannot drop to 0V until the reactor is burnt out. And tracking and judging the positive sequence voltage of the reactor according to the voltage characteristics of the turn-to-turn faults. The judging conditions are as follows:
Current positive sequence voltage effective value And the positive sequence voltage effective value before m cyclesThe absolute value of the difference of (2) is smaller than:
For example, the current sampling point count n of the reactor protection device is 36, 1 cycle is taken by m cycles, and the corresponding sampling point count before 1 cycle isNamely, the current positive sequence voltage effective value discrimination formula is as follows:
When the positive sequence voltage effective value corresponding to the sampling point count of 36 meets the above formula, the positive sequence voltage is considered to be unchanged, and the positive sequence voltage change trend of the turn-to-turn fault with the sampling point count of 36 meets the turn-to-turn protection action condition. Otherwise, the positive sequence voltage action condition of the inter-turn fault is not satisfied, and the inter-turn fault protection action delay is set to 0.
Specifically, the inter-turn protection current variation trend conditions include a phase current variation trend condition, a negative sequence current variation trend condition, a positive sequence current variation trend condition, and a ratio variation trend condition, wherein,
(1) The phase current change trend condition comprises that the change trend of at least one phase current effective value in the three-phase current effective values is an increasing trend.
The process from turn-to-turn fault of the 35kV reactor to the burnout of the reactor has a period of at least several hundred milliseconds, during which the reactor phase current slowly increases. According to the current characteristics of the turn-to-turn faults, the phase current of the reactor is tracked and judged.
Effective value of current phaseEffective value of phase current corresponding to m cycle frontIs greater thanEffective value of corresponding phase current before multiple m cycles:
For example, the current sampling point count n of the reactor protection device is 36, 1 cycle is taken by m cycles, and the corresponding sampling point count before 1 cycle isTo satisfy the enough sensitivity of turn-to-turn faults, thenThe value is 0.05, namely the discrimination formula of the phase current change trend condition is as follows:
Taking ab inter-phase turn-to-turn faults as an example, when the a-phase current effective value or the b-phase current effective value with the sampling point count of 36 meets the above formula, the phase current change trend with the sampling point count of 36 is considered to meet the phase current change trend condition.
(2) The negative sequence current change trend condition comprises that the change trend of the effective value of the negative sequence current is an increasing trend.
Specifically, the process from the turn-to-turn fault of the 35kV reactor to the burnout of the reactor has a period of time, which is at least hundreds of milliseconds, and during the hundreds of milliseconds, the negative sequence current of the reactor slowly increases. And tracking and judging the negative sequence current of the reactor according to the characteristic of the turn-to-turn fault negative sequence current.
The judging conditions are as follows:
current negative sequence current effective value Negative sequence current effective value corresponding to m cycle frontIs greater thanEffective value of corresponding negative sequence current before multiple m cycles:
For example, the current sampling point count n of the reactor protection device is 36, 1 cycle is taken by m cycles, and the corresponding sampling point count before 1 cycle isTo satisfy the enough sensitivity of turn-to-turn faults, thenThe value is 0.02, namely the discrimination formula of the negative sequence current change trend condition is as follows:
Taking ab inter-phase turn-to-turn faults as an example, when the negative sequence current effective value of which the sampling point count is 36 meets the above condition, the negative sequence current change trend of which the sampling point count is 36 is considered to meet the negative sequence current change trend condition.
(3) The positive sequence current change trend condition comprises that the change trend of the positive sequence current effective value is an increasing trend.
Specifically, the process from the turn-to-turn fault of the 35kV reactor to the burnout of the reactor has a period of time, which is at least hundreds of milliseconds, and during the hundreds of milliseconds, the positive sequence current of the reactor slowly increases. And tracking and judging the positive sequence current of the reactor according to the characteristic of the positive sequence current of the turn-to-turn fault.
The judging conditions are as follows:
Current positive sequence current effective value Positive sequence current effective value corresponding to m cycle frontIs greater thanPositive sequence current effective value corresponding to m times of cycle;
For example, the current sampling point count n of the reactor protection device is 36, 1 cycle is taken by m cycles, and the corresponding sampling point count before 1 cycle isTo satisfy the enough sensitivity of turn-to-turn faults, thenThe value is 0.05, namely the discrimination formula of the positive sequence current variation trend condition is as follows:
Taking ab inter-phase turn-to-turn faults as an example, when the positive sequence current effective value of which the sampling point count is 36 meets the above condition, the positive sequence current change trend of which the sampling point count is 36 is considered to meet the positive sequence current change trend condition.
(4) The ratio change trend condition comprises that the change trend of the ratio of the negative sequence current effective value to the positive sequence current effective value is an increasing trend.
Specifically, the process from the turn-to-turn fault of the 35kV reactor to the burnout of the reactor has a period of time which is at least several hundred milliseconds, and the ratio of the negative sequence current to the positive sequence current of the reactor is during the several hundred millisecondsSlowly increases. According to the negative sequence of turn-to-turn faults ratio of current to positive sequence currentCharacteristic is that the ratio of negative sequence current to positive sequence current of reactorAnd (5) tracking judgment is carried out.
The judging conditions are as follows:
the ratio of the present negative sequence current effective value to the positive sequence current effective value The ratio of the positive sequence current effective value to the negative sequence current effective value corresponding to the m cycle frontIs greater than:
For example, the current sampling point count n of the reactor protection device is 36, 1 cycle is taken by m cycles, and the corresponding sampling point count before 1 cycle isTo satisfy the enough sensitivity of turn-to-turn faults, thenThe value is 0.01, namely the discrimination formula of the ratio change trend condition is as follows:
Taking ab inter-phase turn-to-turn fault as an example, when the sampling point count is 36, the ratio of the negative sequence current effective value to the positive sequence current effective value When the above is satisfied, the ratio of the negative sequence current effective value to the positive sequence current effective value of which the sampling point count is 36 is consideredThe variation trend satisfies the ratio variation trend condition.
Specifically, step S110 includes the steps of:
judging whether the phase current change trend condition, the negative sequence current change trend condition, the positive sequence current change trend condition and the ratio change trend condition are all met or not based on the three-phase current effective value, the negative sequence current effective value, the positive sequence current effective value and the ratio of the negative sequence current effective value to the positive sequence current effective value;
if yes, judging that the inter-turn protection current change trend condition is met.
Specifically, step S112 includes that when the inter-turn protection starting condition is met and the inter-turn protection action condition is met and the inter-turn protection current variation trend condition is met at the same sampling time, the target inter-turn protection action condition of the sampling point is met. And when the target inter-turn protection action conditions of the continuous M milliseconds corresponding to the sampling points are all met, tripping the inter-turn protection action.
Taking ab inter-phase turn-to-turn fault as an example, when the sampling point count is 36, the target inter-turn protection action condition is met, and timing judgment is started.
The number of sampling points corresponding to M milliseconds after the sampling point count 36 meets the target inter-turn protection action condition, namely the positive sequence voltage is basically unchanged, the a-phase or b-phase current continuously increases, the negative sequence current continuously increases, the positive sequence current continuously increases, and the ratio of the negative sequence current to the positive sequence current continuously increases in M milliseconds, so that the inter-turn protection action is realized.
Optionally, in this example, M milliseconds takes 2 times the cycle time (1 cycle for 20ms, corresponding to 24 points for sampling point N), i.e., from sampling point count 36 to count 84 (36+48), each meeting the target inter-turn protection action condition, the inter-turn protection trips.
As can be seen from the above description, the embodiment of the invention provides a protection method for inter-turn faults of a reactor, which tracks the voltage and current variation trend, and the protection method comprises the steps of collecting three-phase voltage and three-phase current connected with the reactor by using a reactor protection device, calculating corresponding positive sequence voltage, three-phase current, positive sequence current and negative sequence current, and judging according to inter-turn fault characteristics of a 35kV reactor:
Judging whether the inter-turn fault occurs in the reactor or not by tracking the trend that the positive sequence voltage is basically unchanged when the inter-turn fault occurs, if the positive sequence voltage is basically unchanged, considering that the inter-turn fault is likely to occur in the reactor, further judging the current to accelerate the inter-turn protection action;
According to the current characteristics of the turn-to-turn fault of the 35kV reactor, judging that when the turn-to-turn fault occurs, the phase current, the positive sequence current and the negative sequence current are slowly increased, and the current is considered to meet the characteristics of the turn-to-turn fault by tracking the continuously increasing trend of the phase current, the negative sequence current, the ratio of the positive sequence current to the negative sequence current and the positive sequence current. When the voltage characteristic and the current characteristic are both satisfied, then the inter-turn fault protection trips. The invention can rapidly and accurately judge the turn-to-turn faults of the 35kV reactor and shorten the turn-to-turn fault removal time.
Example two
Fig. 2 is a schematic diagram of a reactor turn-to-turn fault protection system for tracking voltage and current variation trend, which is applied to a reactor protection device of a 35kV power system, according to an embodiment of the present invention. As shown in fig. 2, the system includes a sampling module 10, a calculation module 20, a first judgment module 30, a second judgment module 40, a third judgment module 50, and a protection module 60.
Specifically, the sampling module 10 is configured to collect voltage sampling point data and current sampling point data on the reactor protection device side based on a preset frequency.
The calculating module 20 is configured to calculate a positive sequence voltage effective value, a three-phase current effective value, a positive sequence current effective value, and a negative sequence current effective value based on the voltage sampling point data and the current sampling point data.
The first judging module 30 is configured to judge whether the inter-turn protection starting condition is satisfied based on the positive sequence voltage effective value, the three-phase current effective value, and the ratio of the negative sequence current effective value to the positive sequence current effective value.
The second judging module 40 is configured to judge whether the inter-turn protection action condition is satisfied based on the variation trend of the positive sequence voltage effective value.
The third judging module 50 is configured to judge whether the inter-turn protection current variation trend condition is satisfied based on the three-phase current effective value, the negative sequence current effective value, the positive sequence current effective value, and the ratio of the negative sequence current effective value to the positive sequence current effective value.
The protection module 60 is configured to control the reactor protection device to operate if the inter-turn protection start condition, the inter-turn protection operation condition, and the inter-turn protection current trend condition are all satisfied within the preset sampling time.
Specifically, the calculation module 20 is further configured to convert the voltage sampling point data and the current sampling point data into voltage vector data and current vector data respectively through a full-cycle fourier algorithm, and calculate a positive sequence voltage effective value, a three-phase current effective value, a positive sequence current effective value and a negative sequence current effective value based on the voltage vector data and the current vector data.
The inter-turn protection starting conditions comprise a positive sequence voltage condition, a three-phase current condition and a ratio condition, wherein the positive sequence voltage condition comprises that a positive sequence voltage effective value is larger than a first preset voltage threshold value, the three-phase current condition comprises that three-phase current effective values are all larger than a preset no-current threshold value, and the ratio condition comprises that the ratio of a negative sequence current effective value to a positive sequence current effective value is larger than a preset sensitivity coefficient.
Specifically, the first judging module 30 is further configured to judge whether the positive sequence voltage condition, the three-phase current condition and the ratio condition are all satisfied based on the positive sequence voltage effective value, the three-phase current effective value and the ratio of the negative sequence current effective value to the positive sequence current effective value, and if so, judge that the inter-turn protection starting condition is satisfied.
Specifically, the second judging module 40 is further configured to judge whether an absolute value of a difference between the positive sequence voltage effective value corresponding to the current cycle and the positive sequence voltage effective value corresponding to the historical cycle is smaller than a second preset voltage threshold, and if so, judge that the inter-turn protection action condition is satisfied.
The inter-turn protection current change trend condition comprises a phase current change trend condition, a negative sequence current change trend condition, a positive sequence current change trend condition and a ratio change trend condition, wherein the phase current change trend condition comprises that the change trend of at least one phase current effective value in three-phase current effective values is an increasing trend, the negative sequence current change trend condition comprises that the change trend of the negative sequence current effective values is an increasing trend, the positive sequence current change trend condition comprises that the change trend of the positive sequence current effective values is an increasing trend, and the ratio change trend condition comprises that the change trend of the ratio of the negative sequence current effective values to the positive sequence current effective values is an increasing trend.
Specifically, the third judging module 50 is further configured to judge whether the phase current variation trend condition, the negative sequence current variation trend condition, the positive sequence current variation trend condition and the ratio variation trend condition are all satisfied based on the three-phase current effective value, the negative sequence current effective value, the positive sequence current effective value and the ratio of the negative sequence current effective value to the positive sequence current effective value, and if so, judge that the inter-turn protection current variation trend condition is satisfied.
The invention also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method as provided by the embodiment of the invention when executing the computer program.
The invention also provides a computer readable storage medium storing computer instructions which, when executed by a processor, implement a method as provided by an embodiment of the invention.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510764967.5A CN120280861B (en) | 2025-06-10 | 2025-06-10 | Reactor turn-to-turn fault protection method and system for tracking voltage and current change trend |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510764967.5A CN120280861B (en) | 2025-06-10 | 2025-06-10 | Reactor turn-to-turn fault protection method and system for tracking voltage and current change trend |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN120280861A CN120280861A (en) | 2025-07-08 |
| CN120280861B true CN120280861B (en) | 2025-08-22 |
Family
ID=96243282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202510764967.5A Active CN120280861B (en) | 2025-06-10 | 2025-06-10 | Reactor turn-to-turn fault protection method and system for tracking voltage and current change trend |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN120280861B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101025434A (en) * | 2007-03-28 | 2007-08-29 | 华北电力大学 | Asynchronous motor stator winding inter-turn short circuit failure on-line detecting method and device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101630850B (en) * | 2009-08-07 | 2011-07-13 | 深圳市禾望电气有限公司 | Through power network fault device and through power network fault method of double-fed induction generator |
| US10088516B2 (en) * | 2016-02-10 | 2018-10-02 | General Electric Company | Systems and methods for detecting turn-to-turn faults in windings |
| CN109462249B (en) * | 2018-08-30 | 2022-04-12 | 昆明理工大学 | Double-fed fan asymmetric short-circuit current analysis method considering crowbar protection action |
| CN119340923B (en) * | 2024-11-20 | 2025-05-30 | 中国电力科学研究院有限公司 | Reactor turn-to-turn fault protection method and system based on inductance value change rate |
-
2025
- 2025-06-10 CN CN202510764967.5A patent/CN120280861B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101025434A (en) * | 2007-03-28 | 2007-08-29 | 华北电力大学 | Asynchronous motor stator winding inter-turn short circuit failure on-line detecting method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN120280861A (en) | 2025-07-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104242267B (en) | A kind of wind-power electricity generation sends out transmission line distance protecting method | |
| CN109038489A (en) | A kind of high-voltage shunt reactor turn-to-turn fault guard method | |
| CN113078615B (en) | Active protection method and device for large power transformer | |
| CN110556783B (en) | A kind of transformer zero sequence overcurrent protection method and device | |
| CN110609195A (en) | A method and system for identifying grounding and phase-to-phase faults in a microgrid | |
| CN114094541B (en) | A segmented third harmonic voltage ratio stator grounding protection method and system | |
| CN110850333B (en) | A method for identifying single-phase grounding faults in low-voltage power distribution systems | |
| CN108963974B (en) | A method and device for preventing misoperation of external fault removal differential protection | |
| CN120280861B (en) | Reactor turn-to-turn fault protection method and system for tracking voltage and current change trend | |
| CN113805050A (en) | Phase selection closing angle monitoring method and device, computer equipment and storage medium | |
| CN106532641A (en) | Protection method of parallel dry type air-core reactor based on current and voltage phase angles | |
| CN119340923B (en) | Reactor turn-to-turn fault protection method and system based on inductance value change rate | |
| CN115693616A (en) | Capacity equivalent type current protection method and device suitable for high-proportion new energy power grid | |
| CN118117540B (en) | A protection method and system for identifying internal faults of transformers based on equivalent excitation inductance | |
| CN100362718C (en) | Fault-tolerant complex judging self adaption high voltage parallel reactor turn-to-turn protection | |
| CN118938070A (en) | A method for capturing characteristic points of small current grounding fault | |
| CN115616448B (en) | Method, device, electronic device and computer-readable medium for judging circuit breaker fault of neutral point zero-sequence current loop on high-voltage side of transformer | |
| CN116937808A (en) | Fault isolation method and device for low-voltage distribution network, electronic equipment and storage medium | |
| CN110137910B (en) | Method, device and system for controlling generator stator grounding protection action | |
| CN119335324B (en) | High-resistance arc-light grounding fault diagnosis method and system based on edge calculation | |
| CN115684844B (en) | Voltage sampling loop abnormality diagnosis method and system based on dynamic record data | |
| CN113852046B (en) | Method and system for preventing turn-to-turn protection misoperation when line reactor adopts bus PT | |
| CN117060349B (en) | AC line longitudinal differential protection method and device for wind power access to flexible DC system | |
| CN119582107B (en) | Single-phase grounding protection method and system based on small-resistance grounding system | |
| CN118937907B (en) | Power transmission line fault point troubleshooting method and related equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |