CN108767814A - A kind of electromagnetic potential transformer failure analysis methods and device - Google Patents
A kind of electromagnetic potential transformer failure analysis methods and device Download PDFInfo
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- CN108767814A CN108767814A CN201810681931.0A CN201810681931A CN108767814A CN 108767814 A CN108767814 A CN 108767814A CN 201810681931 A CN201810681931 A CN 201810681931A CN 108767814 A CN108767814 A CN 108767814A
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Classifications
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- 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
- H02H7/04—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 for transformers
- H02H7/045—Differential protection of transformers
- H02H7/0455—Differential protection of transformers taking into account saturation of current transformers
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- 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
-
- 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
An embodiment of the present invention provides a kind of electromagnetic potential transformer failure analysis methods and devices, wherein this method includes：After getting the transient process signal for enabling mutual inductor be saturated, the three-phase voltage of the neutral ground electric current and mutual inductor secondary winding of mutual inductor first winding is acquired；Three-phase voltage is calculated, the residual voltage characteristic quantity of mutual inductor is obtained；After judging that residual voltage characteristic quantity and/or neutral ground electric current meet alarm conditions, the failure cause for determining mutual inductor is corresponded to according to judging result.The present invention is monitored by neutral point current to mutual inductor and three-phase voltage, using residual voltage characteristic quantity and neutral point current as variable to judging whether the failure of mutual inductor, the reason of mulual inductor malfunction is finally determined according to the result of judgement, it can be in mulual inductor malfunction, the reason of realizing and voltage, the electric current of transformer transient process be monitored, and mulual inductor malfunction is accurately analyzed based on monitoring and obtain voltage and current.
Description
Technical field
The present invention relates to voltage transformer field more particularly to a kind of electromagnetic potential transformer failure analysis methods and dress
It sets.
Background technology
A kind of voltage changer of electromagnetic potential transformer (Potential transformer, PT) conduct, can incite somebody to action
The high voltage of one subsidiary risk of current system is converted to the low-voltage that measuring device can detect, be protecting electrical power system, metering and
The necessary fore device of measurement.However electromagnetic transformer is since itself has nonlinear characteristic, it is extensive in aircraft carrier line combined floodgate, failure
It may cause core sataration under the transient processes excitation such as multiple, cause inductance value to reduce, electric current increases, and causes mutual inductor winding
Or explosion accident.It is therefore desirable to carry out qualitative and quantitative analysis to mulual inductor malfunction reason, changes existing appraisal procedure and be difficult to really
Recognize failure cause this limitation.
It is related to its residing electric network composition parameter whether mutual inductor generates saturation and resonance phenomena in power grid transient process,
Since system wiring pattern and switching process are multifarious, cause failure go to toward can not accurate envisioned defects generation, failure
Foundation is also lacked to the lookup of failure cause and analysis afterwards, it is equipment failure itself that cannot be distinguished or parameter matching is bad to be led
Cause the generation of failure.For mulual inductor malfunction two methods can be used at present, it is right after breaking down one is by emulation mode
Systematic parameter is calculated, and is compared with empirical data according to its parameter attribute and Overvoltage Amplitude, thus it is speculated that whether there is
Resonance cause failure possibility, but this method only rest on conjecture and non-faulting is qualitative；Second method uses field measurement,
The transient characteristic in practical switching is obtained by the general divider of in-site installation and the method that carries out equipment or circuit switching.And
However, field measurement is often measured only for voltage, but empirical evidence significant portion PT failures show as an overcurrent and burn
It ruins, it is non-linear due to mutual inductor, mutual inductor voltage can not be passed through and speculate actual current value.In addition this method can not predict system
Earth fault, it is also difficult to which fault point is artificially set at the scene, to monitor failure and failover procedure.What be in addition, there will be is logical
Used voltage monitor often based on portable, needs to remove after completing closing and opening test, and mutual inductor saturation process feature
Measurer has dispersibility, can not fully react its characteristic by limited measure several times.Therefore both the above method can not be straight
It is reversed to answer PT failure causes, cause the mutual inductor that grid parts position is installed to break down again and again, is brought for safety lock production hidden
Suffer from.
Therefore it provides it is a kind of can promptly and accurately analysis voltage mulual inductor malfunction method and device become art technology
Personnel's technical problem urgently to be resolved hurrily.
Invention content
An embodiment of the present invention provides a kind of electromagnetic potential transformer failure analysis methods and devices, can be to mutual inductor
State be monitored, and realize and the lookup of mulual inductor malfunction reason analyzed.
According to an aspect of the present invention, a kind of electromagnetic potential transformer failure analysis methods are provided, including：
After getting the transient process signal for enabling mutual inductor be saturated, the neutral ground of the mutual inductor first winding is acquired
The three-phase voltage of electric current and the mutual inductor secondary winding；
The three-phase voltage is calculated, the residual voltage characteristic quantity of the mutual inductor is obtained；
After judging that the residual voltage characteristic quantity and/or the neutral ground electric current meet alarm conditions, according to sentencing
Disconnected result corresponds to the failure cause for determining the mutual inductor.
Preferably, enable the transient process signal that mutual inductor is saturated single-phase for the switching signal of breaker or the power grid
The recovery signal of earth fault.
Preferably, described to calculate the three-phase voltage, the residual voltage characteristic quantity for obtaining the mutual inductor is specific
For：
The three-phase voltage is synthesized to obtain open-delta voltage, extracts the zero sequence of the open-delta voltage
Voltage characteristic amount.
Preferably, the residual voltage characteristic quantity includes：Voltage peak, zero sequence half order harmonic components amplitude and zero
Sequence third-harmonic component amplitude.
Preferably, the judgement residual voltage characteristic quantity and/or the neutral ground electric current meet alarm conditions
Specially：
In the voltage peak, zero sequence half order harmonic components amplitude and zero-sequence third harmonic component amplitude, sentence
Any one of residual voltage characteristic quantity that breaks is more than corresponding preset voltage thresholds, then meets electric voltage exception alarm conditions；
And/or
Judge that the neutral ground electric current is more than preset current threshold value, and continues preset time period and unattenuated, then it is full
Sufficient overcurrent alarm conditions.
Preferably, described corresponded to according to judging result determines that the failure cause of the mutual inductor is specially：
If the zero-sequence third harmonic component amplitude is more than corresponding preset voltage thresholds, and the neutral ground electric current
More than preset current threshold value, and continue preset time period and unattenuated, it is determined that the failure of the mutual inductor is drawn by high-frequency resonant
The overcurrent risen causes；
If the zero sequence half harmonic component amplitude is more than corresponding preset voltage thresholds, and the neutral ground
Electric current is more than preset current threshold value, and continues preset time period and unattenuated, it is determined that the failure of the mutual inductor is humorous by dividing
Overcurrent causes caused by shaking；
If the voltage peak is more than corresponding preset voltage thresholds, and the neutral ground electric current is more than preset current
Threshold value, and continue preset time period and unattenuated, it is determined that failure overcurrent caused by industrial frequency resonance of the mutual inductor causes；
If meeting the overcurrent alarm conditions and being unsatisfactory for the electric voltage exception alarm conditions, it is determined that the mutual inductance
The failure of device is caused by short circuit or load；
If meeting the electric voltage exception alarm conditions and being unsatisfactory for the overcurrent alarm conditions, it is determined that the mutual inductance
The failure of device is caused by insulation defect.
According to another aspect of the present invention, a kind of electromagnetic potential transformer fail analysis device is provided, including：
Acquisition module, for get enable mutual inductor be saturated transient process signal after, acquire the mutual inductor once around
The three-phase voltage of the neutral ground electric current and the mutual inductor secondary winding of group；
Computing module obtains the residual voltage characteristic quantity of the mutual inductor for calculating the three-phase voltage；
Determining module, for judging the residual voltage characteristic quantity and/or neutral ground electric current satisfaction alarm
After condition, the failure cause for determining the mutual inductor is corresponded to according to judging result.
Preferably, enable the transient process signal that mutual inductor is saturated single-phase for the switching signal of breaker or the power grid
The recovery signal of earth fault.
According to another aspect of the present invention, a kind of electromagnetic potential transformer fail analysis device is provided, including：Storage
Device, and it is coupled to the processor of the memory；
The processor is configured as, based on the instruction being stored in the memory devices, executing above-described electromagnetism
Formula voltage transformer failure analysis methods.
According to another aspect of the present invention, a kind of computer-readable medium is provided, computer program is stored thereon with, the journey
Above-described electromagnetic potential transformer failure analysis methods are realized when sequence is executed by processor.
As can be seen from the above technical solutions, the embodiment of the present invention has the following advantages：
An embodiment of the present invention provides a kind of electromagnetic potential transformer failure analysis methods and devices, wherein this method
Including：Get enable mutual inductor be saturated transient process signal after, acquire mutual inductor first winding neutral ground electric current and
The three-phase voltage of mutual inductor secondary winding；Three-phase voltage is calculated, the residual voltage characteristic quantity of mutual inductor is obtained；Judging
After residual voltage characteristic quantity and/or neutral ground electric current meet alarm conditions, is corresponded to according to judging result and determine mutual inductor
Failure cause.The present invention is monitored by neutral point current to mutual inductor and three-phase voltage, with residual voltage characteristic quantity and
Neutral point current, to judging whether the failure of mutual inductor, finally determines mulual inductor malfunction as variable according to the result of judgement
The reason of, it can realize and voltage, the electric current of transformer transient process are monitored, and to monitor in mulual inductor malfunction
The reason of mulual inductor malfunction is accurately analyzed based on to voltage and current.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without having to pay creative labor, may be used also for those of ordinary skill in the art
To obtain other attached drawings according to these attached drawings.
Fig. 1 is that a kind of flow of one embodiment of electromagnetic potential transformer failure analysis methods provided by the invention is shown
It is intended to；
Fig. 2 is that a kind of structure of one embodiment of electromagnetic potential transformer fail analysis device provided by the invention is shown
It is intended to.
Specific implementation mode
An embodiment of the present invention provides a kind of electromagnetic potential transformer failure analysis methods and devices, can be to mutual inductor
State be monitored, and realize and the lookup of mulual inductor malfunction reason analyzed.
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that disclosed below
Embodiment be only a part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, this field
All other embodiment that those of ordinary skill is obtained without making creative work, belongs to protection of the present invention
Range.
Referring to Fig. 1, a kind of one embodiment of electromagnetic potential transformer failure analysis methods provided by the invention, packet
It includes：
101, after getting the transient process signal for enabling mutual inductor be saturated, the neutral ground of mutual inductor first winding is acquired
The three-phase voltage of electric current and mutual inductor secondary winding；
In the present embodiment, the parameter of the mutual inductor in power grid is monitored in real time, enables mutual inductor be saturated getting
Transient process signal after, then accelerate the three-phase to the neutral ground electric current and mutual inductor secondary winding of mutual inductor first winding
The picking rate of voltage, to obtain the parameter under mutual inductor saturation state.
102, three-phase voltage is calculated, obtains the residual voltage characteristic quantity of mutual inductor；
After obtaining neutral ground electric current and the three-phase voltage under mutual inductor saturation state, three-phase voltage is calculated,
Corresponding residual voltage characteristic quantity is obtained, and alarm bar is met as judgement using centre-point earth electric current and residual voltage characteristic quantity
Condition whether part.
103, it after judging that residual voltage characteristic quantity and/or neutral ground electric current meet alarm conditions, is tied according to judgement
Fruit corresponds to the failure cause for determining mutual inductor.
Since residual voltage characteristic quantity and neutral ground electric current are to separate to judge, the two amounts meet alarm bar
Result whether part can be multiple combinations situation, therefore the present embodiment corresponds to according to the result of judgement and determines that the failure of mutual inductor is former
Cause.
The present invention is monitored by neutral point current to mutual inductor and three-phase voltage, with residual voltage characteristic quantity and in
Property point electric current, to judging whether the failure of mutual inductor, finally determines mulual inductor malfunction as variable according to the result of judgement
Reason can be realized and be monitored to voltage, the electric current of transformer transient process in mulual inductor malfunction, and obtained with monitoring
The reason of mulual inductor malfunction is accurately analyzed based on voltage and current.
It is a kind of one embodiment of electromagnetic potential transformer failure analysis methods above, to carry out in particular
It is bright, a kind of another embodiment of electromagnetic potential transformer failure analysis methods, a kind of electricity provided by the invention is provided below
Another embodiment of electromagnetic type voltage transformer failure analysis methods, including：
201, after getting the switching signal of breaker or the recovery signal of the electric network single-phase earth fault, mutual inductance is acquired
The three-phase voltage of the neutral ground electric current and mutual inductor secondary winding of device first winding；
According to previous accident analysis experience, no matter electromagnetic potential transformer is that three-phase is split type or three-phase five-limb,
First winding burning fault often first occur on 1~2 winding rather than three-phase at the same occur overheat burn, theoretically
The phenomenon is explained, PT overcurrents are often due to core sataration causes, and core sataration is often excited by overvoltage, three-phase mistake
Voltage and degree of saturation do not have simultaneity usually.In summary theoretical and practical experience considers in three-phase mutual inductor neutral point
One current sensor is installed, no matter single-phase or two-phase saturation causes overcurrent, can be risen by neutral point current amplitude
With reflection.Common electromagnetic potential transformer pattern is different, for three-phase five-pole voltage transformer, due to three-phase windings
End is not drawn respectively, and only provides neutral point earth current, therefore using the method being only monitored to earth current
Meet the structural requirement of this typical case PT of three-phase and five-pole.Current sensor band requirement meets fundamental frequency and higher hamonic wave measurement is wanted
It asks, measurement accuracy requirement is met in low-frequency range.It is also contemplated that installation when choosing current sensor form and removes convenience.
PT is saturated and its caused overcurrent is burnt and often excited by two class transient process of power grid：1. closing operation, especially
Mutual inductor saturation is easily caused when the short busbar of division；2 electric network single-phase earth faults restore.It is supervised two above signal as quickening
The trigger condition for degree of testing the speed, and monitoring and recording time are adjusted, most of mutual inductor over current fault process can be covered.Therefore, with
The transient process of this upper two classes network system can cause mutual inductor to be saturated, then at this point, the voltage and current of mutual inductor
Accordingly changed, it is to be understood that two transient processes are the inducements of mutual inductor saturation, but the failure of mutual inductor is former
Cause is often varied and is difficult to clearly analyze, and therefore, the present invention passes through neutral ground electric current and residual voltage characteristic quantity
The states such as size carry out accurate the reason of judging mulual inductor malfunction.
202, three-phase voltage is synthesized to obtain open-delta voltage, extracts the residual voltage of open-delta voltage
Characteristic quantity, wherein residual voltage characteristic quantity includes：Voltage peak, zero sequence half order harmonic components amplitude and zero sequence are three times
Harmonic component amplitude；
Since line voltage remains unchanged when mutual inductor saturation has zero sequence characteristic, i.e. failure, phase voltage increases, open delta
Shape voltage is equal to 3 times of neutral point voltages.When normal operation, open-delta voltage is zero, when monitoring that it is a certain that voltage rises to
When amplitude, show that the earth fault that network system has occurred or mutual inductor are saturated.Therefore by obtaining open-delta
Voltage can effectively reflect network system transient process.
Therefore, the embodiment of the present invention is after determining mutual inductor saturation, to mutual inductor three-phase voltage synthesis open-delta electricity
Pressure obtains three characteristic quantities：1, voltage peak；2,1/2 order harmonic components amplitude of zero sequence；3, zero-sequence third harmonic component amplitude.
Be calculated three characteristic quantities are compared with respective preset threshold value, it is when three's any one exceeds threshold value, then full
The electric voltage exception alarm conditions of sufficient mulual inductor malfunction.Threshold value chooses it is contemplated that following factor：
For the preset threshold value V of voltage peakP, open-delta voltage (100V), is opened when can choose singlephase earth fault
Mouth triangular voltage shows that earth fault has occurred in system when reaching the value；For the preset threshold value of 1/2 order harmonic components amplitude
V3And the preset threshold value V of third-harmonic component amplitude1/2, there are the lower each harmonic of amplitude, correlation marks when system normal operation
Standard is distinctly claimed harmonic component, the harmonics level when triggering of device needs to avoid normal operation.It can be according to power quality
Relevant criterion requires to choose the two rahmonic component upper limits, and is multiplied by a certain coefficient as harmonic condition threshold value.
203, it after judging that residual voltage characteristic quantity and/or neutral ground electric current meet alarm conditions, is tied according to judgement
Fruit corresponds to the failure cause for determining mutual inductor.
In the present embodiment, judge that residual voltage characteristic quantity and/or neutral ground electric current meet alarm conditions and be specially：
In voltage peak, zero sequence half order harmonic components amplitude and zero-sequence third harmonic component amplitude, judge to appoint
One residual voltage characteristic quantity of meaning is more than corresponding preset voltage thresholds, then meets electric voltage exception alarm conditions；
And/or
Judge that neutral ground electric current is more than preset current threshold value, and continuing preset time period (can be according to actual demand
It is arranged in advance) and it is unattenuated, then meet overcurrent alarm conditions.
In the present embodiment, since there are three residual voltage characteristic quantities, wherein any one is more than corresponding preset voltage
Threshold value can then meet electric voltage exception alarm conditions, and neutral ground electric current is more than preset current threshold value, and when continuing preset
Between section and it is unattenuated after can then meet overcurrent alarm conditions, it should be noted that the two conditions can only meet one,
It can also meet simultaneously, therefore, following five kinds of situations can occur in judging result, and can correspond to and determine respective mulual inductor malfunction
The reason of：
(1) if zero-sequence third harmonic component amplitude is more than corresponding preset voltage thresholds, and neutral ground electric current is more than
Preset current threshold value, and continue preset time period and unattenuated, it is determined that the failure of mutual inductor overcurrent caused by high-frequency resonant
Cause；
(2) if zero sequence half harmonic component amplitude is more than corresponding preset voltage thresholds, and neutral ground electric current
More than preset current threshold value, and continue preset time period and unattenuated, it is determined that the failure of mutual inductor is caused by Subharmonic Resonance
Overcurrent causes；
(3) if voltage peak is more than corresponding preset voltage thresholds, and neutral ground electric current is more than preset current threshold value,
And continue preset time period and unattenuated, it is determined that failure overcurrent caused by industrial frequency resonance of mutual inductor causes；
(4) if meeting overcurrent alarm conditions and being unsatisfactory for electric voltage exception alarm conditions, it is determined that the failure of mutual inductor
Caused by short circuit or load；
(5) if meeting overvoltage abnormality alarming condition and being unsatisfactory for overcurrent alarm conditions, it is determined that the failure of mutual inductor
Caused by insulation defect.
For above-mentioned failure cause (4), in addition to the mutual inductor overcurrent caused by the saturation, when mutual inductor itself is due to winding insulation
The factors such as defect, load characteristic variation, load leads short circuit and wiring error may also cause overcurrent.The overcurrent value often by
Step increases and reaches the hundreds of times of rated primary current, mutual inductor is caused to burn after running a few minutes.Due to such overcurrent
It is unrelated with mutual inductor nonlinear characteristic itself therefore unrelated with transient voltage.
The present invention is monitored by neutral point current to mutual inductor and three-phase voltage, with residual voltage characteristic quantity and in
Property point electric current, to judging whether the failure of mutual inductor, finally determines mulual inductor malfunction as variable according to the result of judgement
Reason can be realized and be monitored to voltage, the electric current of transformer transient process in mulual inductor malfunction, and obtained with monitoring
The reason of mulual inductor malfunction is accurately analyzed based on voltage and current.
It is the detailed description that a kind of electromagnetic potential transformer failure analysis methods provided by the invention are carried out above, with
It is lower to illustrate a kind of electromagnetic potential transformer fail analysis device provided by the invention, referring to Fig. 2, the present invention provides
A kind of electromagnetic potential transformer fail analysis device one embodiment, including：
Acquisition module 201 acquires mutual inductor first winding after getting the transient process signal for enabling mutual inductor be saturated
Neutral ground electric current and mutual inductor secondary winding three-phase voltage；
Computing module 202 obtains the residual voltage characteristic quantity of mutual inductor for calculating three-phase voltage；
Determining module 203, for judging that residual voltage characteristic quantity and/or neutral ground electric current meet alarm conditions
Afterwards, the failure cause for determining mutual inductor is corresponded to according to judging result.
Further, it is the switching signal or power grid single-phase earthing of breaker to enable the transient process signal that mutual inductor is saturated
The recovery signal of failure.
Further, computing module 202 is additionally operable to be synthesized to obtain open-delta voltage to three-phase voltage, extraction
The residual voltage characteristic quantity of open-delta voltage.
Further, residual voltage characteristic quantity includes：Voltage peak, zero sequence half order harmonic components amplitude and zero
Sequence third-harmonic component amplitude.
Further, determining module 203 includes：
Judging unit, for judging whether residual voltage characteristic quantity and/or neutral ground electric current meet alarm conditions；
Determination unit, for corresponding to the failure cause for determining mutual inductor according to judging result；
Judging unit is additionally operable in voltage peak, zero sequence half order harmonic components amplitude and zero-sequence third harmonic component
In amplitude, judges that any one residual voltage characteristic quantity is more than corresponding preset voltage thresholds, then meet electric voltage exception alarm bar
Part；
And/or
Judge that neutral ground electric current is more than preset current threshold value, and continues preset time period and unattenuated, then to meet
Electric current alarm conditions.
Further, determination unit is additionally operable to：
If zero-sequence third harmonic component amplitude is more than corresponding preset voltage thresholds, and neutral ground electric current is more than preset
Current threshold, and continue preset time period and unattenuated, it is determined that failure overcurrent caused by high-frequency resonant of mutual inductor causes；
If zero sequence half harmonic component amplitude is more than corresponding preset voltage thresholds, and neutral ground electric current is more than
Preset current threshold value, and continue preset time period and unattenuated, it is determined that the failure of mutual inductor overcurrent caused by Subharmonic Resonance
Cause；
If voltage peak is more than corresponding preset voltage thresholds, and neutral ground electric current is more than preset current threshold value, and
Continue preset time period and unattenuated, it is determined that failure overcurrent caused by industrial frequency resonance of mutual inductor causes；
If meeting overcurrent alarm conditions and being unsatisfactory for electric voltage exception alarm conditions, it is determined that the failure of mutual inductor is by short
Road or load cause；
If meeting overvoltage abnormality alarming condition and being unsatisfactory for overcurrent alarm conditions, it is determined that the failure of mutual inductor is by exhausted
Edge defect causes.
A kind of another embodiment of electromagnetic potential transformer fail analysis device provided by the invention, including：Storage
Device, and it is coupled to the processor of memory；
Processor is configured as, based on the instruction being stored in memory devices, it is mutual executing above-described electromagnetic potential
Sensor failure analysis methods.
The invention further relates to a kind of computer-readable mediums, are stored thereon with computer program, which is held by processor
Above-described electromagnetic potential transformer failure analysis methods are realized when row.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed system, device and method can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
It divides, only a kind of division of logic function, formula that in actual implementation, there may be another division manner, such as multiple units or component
It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be the indirect coupling by some interfaces, device or unit
It closes or communicates to connect, can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, you can be located at a place, or may be distributed over multiple
In network element.Some or all of unit therein can be selected according to the actual needs to realize the mesh of this embodiment scheme
's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also
It is that each unit physically exists alone, it can also be during two or more units be integrated in one unit.Above-mentioned integrated list
The form that hardware had both may be used in member is realized, can also be realized in the form of SFU software functional unit.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can be stored in a computer read/write memory medium.Based on this understanding, technical scheme of the present invention is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can be personal computer, server or the network equipment etc.) executes the complete of each embodiment the method for the present invention
Portion or part steps.And storage medium above-mentioned includes：USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can store journey
The medium of sequence code.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to before
Stating embodiment, invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be to preceding
The technical solution recorded in each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
Modification or replacement, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of electromagnetic potential transformer failure analysis methods, which is characterized in that including：
After getting the transient process signal for enabling mutual inductor be saturated, the neutral ground electric current of the mutual inductor first winding is acquired
With the three-phase voltage of the mutual inductor secondary winding；
The three-phase voltage is calculated, the residual voltage characteristic quantity of the mutual inductor is obtained；
After judging that the residual voltage characteristic quantity and/or the neutral ground electric current meet alarm conditions, tied according to judgement
Fruit corresponds to the failure cause for determining the mutual inductor.
2. electromagnetic potential transformer failure analysis methods according to claim 1, which is characterized in that mutual inductor is enabled to be saturated
The transient process signal be breaker switching signal or the electric network single-phase earth fault recovery signal.
3. electromagnetic potential transformer failure analysis methods according to claim 1, which is characterized in that described to described three
Phase voltage is calculated, and the residual voltage characteristic quantity for obtaining the mutual inductor is specially：
The three-phase voltage is synthesized to obtain open-delta voltage, extracts the residual voltage of the open-delta voltage
Characteristic quantity.
4. electromagnetic potential transformer failure analysis methods according to claim 3, which is characterized in that the residual voltage
Characteristic quantity includes：Voltage peak, zero sequence half order harmonic components amplitude and zero-sequence third harmonic component amplitude.
5. electromagnetic potential transformer failure analysis methods according to claim 4, which is characterized in that described in the judgement
Residual voltage characteristic quantity and/or the neutral ground electric current meet alarm conditions and are specially：
In the voltage peak, zero sequence half order harmonic components amplitude and zero-sequence third harmonic component amplitude, judge to appoint
One residual voltage characteristic quantity of meaning is more than corresponding preset voltage thresholds, then meets electric voltage exception alarm conditions；
And/or
Judge that the neutral ground electric current is more than preset current threshold value, and continues preset time period and unattenuated, then to meet
Electric current alarm conditions.
6. electromagnetic potential transformer failure analysis methods according to claim 5, which is characterized in that described according to judgement
As a result corresponding to determine that the failure cause of the mutual inductor is specially：
If the zero-sequence third harmonic component amplitude is more than corresponding preset voltage thresholds, and the neutral ground electric current is more than
Preset current threshold value, and continue preset time period and unattenuated, it is determined that the failure of the mutual inductor is caused by high-frequency resonant
Overcurrent causes；
If the zero sequence half harmonic component amplitude is more than corresponding preset voltage thresholds, and the neutral ground electric current
More than preset current threshold value, and continue preset time period and unattenuated, it is determined that the failure of the mutual inductor is drawn by Subharmonic Resonance
The overcurrent risen causes；
If the voltage peak is more than corresponding preset voltage thresholds, and the neutral ground electric current is more than preset current threshold
Value, and continue preset time period and unattenuated, it is determined that failure overcurrent caused by industrial frequency resonance of the mutual inductor causes；
If meeting the overcurrent alarm conditions and being unsatisfactory for the electric voltage exception alarm conditions, it is determined that the mutual inductor
Failure is caused by short circuit or load；
If meeting the electric voltage exception alarm conditions and being unsatisfactory for the overcurrent alarm conditions, it is determined that the mutual inductor
Failure is caused by insulation defect.
7. a kind of electromagnetic potential transformer fail analysis device, which is characterized in that including：
Acquisition module acquires the mutual inductor first winding after getting the transient process signal for enabling mutual inductor be saturated
The three-phase voltage of neutral ground electric current and the mutual inductor secondary winding；
Computing module obtains the residual voltage characteristic quantity of the mutual inductor for calculating the three-phase voltage；
Determining module, for judging that the residual voltage characteristic quantity and/or the neutral ground electric current meet alarm conditions
Afterwards, the failure cause for determining the mutual inductor is corresponded to according to judging result.
8. electromagnetic potential transformer fail analysis device according to claim 7, which is characterized in that mutual inductor is enabled to be saturated
The transient process signal be breaker switching signal or the electric network single-phase earth fault recovery signal.
9. a kind of electromagnetic potential transformer fail analysis device, which is characterized in that including：Memory, and be coupled to described
The processor of memory；
The processor is configured as, based on the instruction being stored in the memory devices, executing as claim 1 to 6 is arbitrary
Electromagnetic potential transformer failure analysis methods described in one.
10. a kind of computer-readable medium, is stored thereon with computer program, which is characterized in that the program is executed by processor
Electromagnetic potential transformer failure analysis methods described in Shi Shixian claim 1 to 6 any one.
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