CN105203911B - Three phase mains open phase fault detection method, device and a kind of automatic change-over - Google Patents
Three phase mains open phase fault detection method, device and a kind of automatic change-over Download PDFInfo
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Abstract
The invention discloses a kind of three phase mains open phase fault detection method, belong to low-voltage electrical technical field.The problem of present invention is influenceed to be easily caused missing inspection for existing open phase fault detection technique by connect load, using existing detection circuit, the phase difference between A phases phase voltage and BC line voltages is detected by A phase phase voltages sample circuit, BC line voltages sample circuit（Or phase angle difference）, according to intrinsic changing rule of the phase difference in the case of disconnected phase, realize the reliable detection of B phases or C phase open phase faults.The invention also discloses a kind of three phase mains open phase fault detection means and a kind of automatic change-over.Compared with prior art, the present invention is not influenceed by connect load, high to the Detection accuracy of open phase fault, and circuit is simple, cost of implementation is low.
Description
Technical field
The present invention relates to a kind of three phase mains open phase fault detection method, device, belong to low-voltage electrical technical field.
Background technology
Automatic change-over is had been widely used in industrial power supply system, and automatic change-over standing uses three by detecting
The malfunction of phase power supply realizes automatic conversion.The malfunction of three phase mains is including under-voltage, over-pressed, disconnected equal, wherein right
The following two methods of detection generally use for phase of breaking in three phase mains：It is a kind of be by detect the phase voltage of A phase, B phase, C phase come
Judge whether disconnected phase, be determined as disconnected phase when the phase voltage of certain phase is less than 30% specified phase voltage；Another kind is by detecting A
Phase phase voltage, BC line voltages judge whether disconnected phase, same when A phases phase voltage is less than 30% specified phase voltage or BC line voltages
It is determined as disconnected phase during less than 30% rated line voltage.First method can be accurately judged to disconnected phase, but hardware circuit is answered
Miscellaneous, cost is relatively high.Second method can save the hardware sample circuit of a phase, and circuit is simple, cost is low, but due to automatic
Change-over switch outlet side is typically connected with voltmeter, electric instrument even load, automatic change-over is conventional or standby enter line side
B phases or C phases break phase when, the line voltage value between the B phases and C phases that detect is likely larger than 30% rated line voltage and causes to control
Device processed judges B phases or the disconnected mutually error, and then have a strong impact on the security reliability of whole electric power system of C phases.
The content of the invention
The technical problems to be solved by the invention are solve the problems of prior art, there is provided a kind of three phase mains
Open phase fault detection method, device, it is not influenceed by connect load, high to the Detection accuracy of open phase fault, and circuit letter
List, cost of implementation are low.
It is of the invention specifically to solve above-mentioned technical problem using following technical scheme：
Three phase mains open phase fault detection method, between the phase voltage and the second phase and third phase to the phase of three phase mains first
Line voltage carry out voltage sample respectively, be then calculated the value of the first phase phase voltage according to voltage sample result, and with
It is at least one in lower two parameter：The phase difference φ of line voltage between first phase phase voltage and the second phase and third phase, in three-phase
The rising edge zero-acrross ing moment of first phase phase voltage in power supply a cycle T/between trailing edge zero-acrross ing moment and the second phase and third phase
Time difference Δ t between rising edge zero-acrross ing moment/trailing edge zero-acrross ing moment of line voltage；Then Δ φ is calculated*Or Δ t*, It is if any one in following condition
It is individual to be met, then judge that open phase fault occurs in the three phase mains：The value of first phase phase voltage is less than default phase voltage threshold
Value, | 90 °-Δ φ*| more than default phase difference threshold,More than default time difference threshold value；Such as the three-phase electricity
Source connection load connects for single triangle, then the span of the phase difference threshold is [0 °, 60 °], the time difference threshold
The span of value isThe three phase mains connection load as described in is non-single triangle connection, then the phase difference threshold
The span of value is [0 °, 30 °], and the span of the time difference threshold value is
Preferably, between the first phase phase voltage and the second phase and third phase line voltage phase difference φ, calculated according to Δ t
Arrive：
Δ φ=360 ° × f × Δ t
In formula, f be the three phase mains frequency, unit Hz；Time difference Δ t unit is s.
Preferably, the detection method of the rising edge zero-acrross ing moment/trailing edge zero-acrross ing moment is specific as follows：For each
Voltage sample point, the magnitude of voltage of the magnitude of voltage of current sampling point, a upper sampled point is crossed into zero reference value with voltage sample respectively and entered
Row compares, if the magnitude of voltage of current sampling point crosses zero reference value more than voltage sample, the magnitude of voltage of a upper sampled point
Zero reference value is crossed less than or equal to voltage sample, then current sampling point is rising edge zero-acrross ing moment；, whereas if current sampling point
While magnitude of voltage crosses zero reference value less than voltage sample, the magnitude of voltage of a upper sampled point crosses zero reference more than or equal to voltage sample
Value, then current sampling point is trailing edge zero-acrross ing moment.
It is the connection of single triangle preferably for connection load, the three phase mains of non-single triangle connection, the phase
Potential difference threshold value is respectively 30 °, 15 °, and the time difference threshold value is respectively
Three phase mains open phase fault detection means, including：It is respectively used to the phase voltage to the phase of three phase mains first and
Line voltage between two-phase and third phase carries out phase voltage sample circuit, the line voltage sample circuit of voltage sample, and electric with phase
The breakdown judge unit that pressure sample circuit, line voltage sample circuit connect respectively；The breakdown judge unit include computing module,
Judge module；The computing module is used for the value that the first phase phase voltage is calculated according to the sampled result of phase voltage sample circuit, with
It is and at least one in following two parameter：The phase difference φ of line voltage between first phase phase voltage and the second phase and third phase,
Rising edge zero-acrross ing moment/trailing edge the zero-acrross ing moment and the second phase and the 3rd of first phase phase voltage in three phase mains a cycle T
Time difference Δ t between rising edge zero-acrross ing moment/trailing edge zero-acrross ing moment of alternate line voltage, then calculates Δ φ*Or Δ
t*, The judge module is used for basis
The output result of computing module judges whether the three phase mains open phase fault occurs：If any one in following condition obtains
To satisfaction, then judge that open phase fault occurs in the three phase mains：First phase phase voltage is less than default phase voltage threshold value, | 90 °-
Δφ*| more than default phase difference threshold,More than default time difference threshold value；As the three phase mains connection is negative
Carry and connected for single triangle, then the span of the phase difference threshold is [0 °, 60 °], the value of the time difference threshold value
Scope isThe three phase mains connection load as described in is non-single triangle connection, then the value of the phase difference threshold
Scope is [0 °, 30 °], and the span of the time difference threshold value is
Preferably, the computing module includes zero-crossing timing difference detection sub-module, phasometer operator module；The zero passage
Time difference detection sub-module is used in a cycle of the three phase mains, is utilized respectively voltage sample result and detects first
Between rising edge zero-acrross ing moment/trailing edge zero-acrross ing moment of phase phase voltage, the second phase and third phase during the rising edge zero passage of line voltage
Quarter/trailing edge zero-acrross ing moment, and calculate both time difference Δ t；The phasometer operator module is based on according to the following formula
Calculation obtains the phase difference φ of line voltage between the first phase phase voltage and the second phase and third phase：
Δ φ=360 ° × f × Δ t
In formula, f be the three phase mains frequency, unit Hz；Time difference Δ t unit is s.
Preferably, the detection method of the rising edge zero-acrross ing moment/trailing edge zero-acrross ing moment is specific as follows：For each
Voltage sample point, the magnitude of voltage of the magnitude of voltage of current sampling point, a upper sampled point is crossed into zero reference value with voltage sample respectively and entered
Row compares, if the magnitude of voltage of current sampling point crosses zero reference value more than voltage sample, the magnitude of voltage of a upper sampled point
Zero reference value is crossed less than or equal to voltage sample, then current sampling point is rising edge zero-acrross ing moment；, whereas if current sampling point
While magnitude of voltage crosses zero reference value less than voltage sample, the magnitude of voltage of a upper sampled point crosses zero reference more than or equal to voltage sample
Value, then current sampling point is trailing edge zero-acrross ing moment.
It is the connection of single triangle preferably for connection load, the three phase mains of non-single triangle connection, the phase
Potential difference threshold value is respectively 30 °, 15 °, and the time difference threshold value is respectively
Following technical scheme can also be obtained according to identical invention thinking：
A kind of automatic change-over, including as above three phase mains open phase fault detection means described in any technical scheme.
Compared with prior art, the invention has the advantages that：
Using phase voltage and line voltage, the phase difference before and after disconnected phase changes to realize the differentiation of the disconnected phase of power supply the present invention, has
Effect overcomes traditional open phase detection method based on line voltage value and judges problem caused by by load effect by accident, can greatly improve three
Phase power supply open phase detection accuracy rate, and then improve the security reliability of electric power system；
The present invention can be based on existing three phase mains failure detector circuit, it is not necessary to efficient processor and complicated hardware
Circuit, it is only necessary to simple software modification is carried out to existing three phase mains failure detector circuit and can be achieved；
The present invention has the characteristics of hardware circuit is simple, and cost of implementation is low, has both been applicable to the upgrading of existing product,
It can also be used for the design of new product.
Brief description of the drawings
Fig. 1 is the principle schematic diagram of automatic change-over；
Fig. 2 is the principle schematic diagram of existing three phase mains phase interruption testing device；
When Fig. 3 is that three-phase voltage is normal, the oscillogram of A phases phase voltage and BC line voltages；
Fig. 4 is the oscillogram of A phases phase voltage and BC line voltages in the case of the disconnected phase of B phases；
Fig. 5 is the oscillogram of A phases phase voltage and BC line voltages in the case of the disconnected phase of C phases.
Embodiment
Technical scheme is described in detail below in conjunction with the accompanying drawings：
Fig. 1 shows the structural principle of automatic change-over, as illustrated, when conventional power supply is normal, loads by conventional electricity
Source power, when conventional power supply occur it is abnormal when, such as it is under-voltage, break equal failure, automatic change-over by commonly use be switched to it is standby,
Load is powered by stand-by power supply.
The following two methods of detection generally use for phase of breaking for three phase mains：One kind is by detecting A phase, B phase, C phase
Phase voltage judge whether disconnected phase, be determined as phase of breaking when the value of the phase voltage of certain phase is less than 30% specified phase voltage；Separately
One kind be by detecting A phases phase voltage, BC line voltages judge whether disconnected phase, same when the value of A phase phase voltages is less than 30%
Specified phase voltage or BC line voltages are determined as disconnected phase when being less than 30% rated line voltage.First method can be accurately judged to
Disconnected phase, but hardware circuit is complicated, cost is relatively high.Second method can save the hardware sample circuit of a phase, circuit is simple,
Cost is low.Therefore automatic change-over is increasingly intended to apply second of detection scheme at present.
Fig. 2 shows the hardware configuration of the detection means using second of detection scheme, as illustrated, A phase phase voltages are adopted
Sample circuit, BC line voltages sample circuit sample to A phases phase voltage, BC line voltages respectively, and microprocessor is according to sampled result
A phases phase voltage, the value of BC line voltages and compared with default voltage threshold the 30% of rated voltage (be usually) are calculated,
Judge whether open phase fault occur according to comparative result.For automatic change-over, phase voltage and the line electricity of three phase mains
Pressure signal is the input acquisition from automatic change-over, and the outlet side of automatic change-over is typically connected with voltmeter, electricity
Power instrument even load.When disconnected phase occurs for B phases or C phases, because the voltmeter of outlet side connection, electric instrument even load will not break phase
Voltage imported into the automatic switch end of incoming cables of disconnected phase, so as to occur still having the phenomenon of BC line voltages, now easily occur
Detected BC line voltages are higher than line voltage threshold value, then is open phase fault does not occur for the judged result of microprocessor, actually
Now B phases or C phases have produced open phase fault.It is larger hidden that the missing inspection of this open phase fault can give the safety of whole electric power system to cause
Suffer from.
The thinking of the present invention is to utilize existing detection circuit, passes through A phase phase voltages sample circuit, BC line voltage sample circuits
To detect the phase difference (or phase angle difference) between A phases phase voltage and BC line voltages, according to phase difference consolidating in the case of disconnected phase
Rule is changed, realizes the reliable detection of B phases or C phase open phase faults.Fig. 3 shows the equal normal condition of A phase, B phase, C phase voltage
The waveform of lower A phases phase voltage and BC line voltages, wherein UAIt is A phase phase voltages sample circuit (the voltage sample electricity in the present embodiment
Road has carried out 2.048V overall lifting to rectified voltage signal) output voltage, UBCIt is that BC line voltages after lifting are adopted
The voltage signal of sample circuit output, now A phases phase voltage and BC line voltage phase angle differences ΔΦ are 90 °.When B phases or C phases are broken
The voltage of not disconnected phase imported into the automatic conversion of broken phase by Xiang Shi, the voltmeter connected by outlet side, electric instrument even load
End of incoming cables is switched, so as to occur still having the phenomenon of BC line voltages, now the phase angle difference of A phases phase voltage and BC line voltages can be sent out
Raw corresponding change, its waveform is as shown in Figure 4, Figure 5.When threephase load does not connect N phases, i.e., three phase mains connection load is single triangle
When shape connects, as A phases, C phase are normal, disconnected phase occurs for B phases, then the phase angle difference ΔΦ between A phases phase voltage and BC line voltages is 30 °,
As A phases, B phases are normal, disconnected phase occurs for C phases, and the phase angle difference between A phases phase voltage and BC line voltages is 150 °, described single triangle
It is a kind of that shape connection refers to that three phase mains connection load only has triangle connected mode.Other three phase mains connection load is non-single
Triangle connection includes：Y-connection, single-phase connection, wantonly two kinds of combinations in triangle connection, Y-connection, single-phase connection
Connection and triangle connection, Y-connection, hybrid connection etc. of single-phase connection composition.The present invention is connected with three phase mains
Load to be illustrated exemplified by Y-connection, when threephase load connects N phases, i.e., three phase mains connection load is Y-connection, such as A
Phase, C phases are normal, and disconnected phase occurs for B phases, then the phase angle difference ΔΦ between A phases phase voltage and BC line voltages is 60 °, such as A phases, B phases just
Often, disconnected phase occurs for C phases, and the phase angle difference ΔΦ between A phases phase voltage and BC line voltages is 120 °.So, according to the phase detected in real time
Angular difference ΔΦ can judge whether B phases and C phases occur open phase fault.In practical situations both, due to the fluctuation meeting of supply frequency
There is deviation in the phase difference for causing to detect, it is therefore desirable to considers influence of this detection error to fault verification.Assuming that to three
The maximum detection error of phase power phase difference ΔΦ is Δ max, then the three-phase electricity for connection load for the connection of single triangle
The judgement that open phase fault occur in source, its B phase or C phases can be according to following criterion：
As the phase difference φ of A phases phase voltage and B phases line voltage alternate with C meets：Δ φ ＜ 30 °+Δ max or Δ φ
＞ 150 °-Δ max, then judge that open phase fault occur in B phases or C phases；Above-mentioned decision condition can be converted to down by simply converting
Formula：
| 90 °-Δ φ | 60 °-Δs of ＞ max
Similarly, it is the three phase mains of Y-connection for connection load, the judgement of open phase fault occur in its B phase or C phases
Formula is：
| 90 °-Δ φ | 30 °-Δs of ＞ max
So, according to the maximum detection error Δ max of actual three phase mains phase difference ΔΦ, will be arranged on the right side of inequality
Fixed phase difference threshold, you can realize that the open phase fault of B phases and C phases judges.Connected for connection load for single triangle
Three phase mains, the span of the phase difference threshold is [0 °, 60 °], preferably value be 30 °；It is non-for connection load
The three phase mains of single triangle connection such as Y-connection, the span of the phase difference threshold is [0 °, 30 °], preferably
Value is 15 °.In actual use, to make open phase fault decision method be applied to any load, the phase difference threshold takes
Value scope chooses the common factor [0 °, 30 °] that single triangle connection load is connected load phase difference threshold value with non-single triangle, excellent
First value is 15 °.
Above-mentioned phase difference ΔΦ can utilize the sampled result of A phase phase voltage sample circuits and BC line voltage sample circuits to calculate
Obtain, be below a specific embodiment.
After automatic change-over connects three phase mains, microprocessor gathers A phase phase voltages in real time by 0.2ms Interruptions,
And record U1–U1ZAnd U1pre–U1Z, when detecting U for the first time1pre≤U1ZAnd U1>U1Z, illustrate that A phases phase voltage waveform is in and rise
Along zero-acrross ing moment, conversely, U ought be detected for the first time1pre≥U1ZAnd U1<U1Z, illustrate that A phases phase voltage waveform is in trailing edge zero passage
Moment.Likewise, microprocessor gathers BC line voltages in real time by 0.2ms Interruptions, and record U23–U23ZAnd U23pre–
U23Z, when detecting U for the first time23pre≤U23ZAnd U23>U23Z, illustrate that BC line voltages waveform is in rising edge zero-acrross ing moment, conversely,
When detecting U for the first time23pre≥U23ZAnd U23<U23Z, illustrate that BC line voltages waveform is in trailing edge zero-acrross ing moment.
Wherein 0.2ms Interruptions are Interruption of the microprocessor Jing Guo parameter setting automatic running；U1To be current
The instantaneous value for the A phase phase voltages that 0.2ms Interruptions are collected by A phase phase voltage sample circuits；U1preDetermine for a upper 0.2ms
When interrupt the instantaneous value of A phase phase voltages collected by A phase phase voltage sample circuits；U23It is current 0.2ms Interruptions by BC
The instantaneous value for the BC line voltages that line voltage sample circuit collects；U23preAdopted for a upper 0.2ms Interruption by BC line voltages
The instantaneous value for the BC line voltages that sample circuit collects；U1ZZero reference value was sampled for A phase phase voltages；U23ZSampled for BC line voltages
Cross zero reference value.
Exemplified by when threephase load does not connect N phases, microprocessor passes through 0.2ms Interruptions, cycle index A phase phase voltage ripples
All U in shape a cycle1Value, all U that will be recorded1–U1ZValue is done quadratic sum and added up, and accumulated value finally is opened into radical sign,
Obtained value is the value (i.e. virtual value) of A phase phase voltages, and the value and default disconnected phase are judged into phase voltage threshold value is (such as desirable
30% phase voltage rated value) it is compared, if the value of A phase phase voltages is less than the threshold value, A phases are broken phase；Otherwise, A phases are normal.
, will such as Fig. 3 in the case of the equal lifting 2.048V of voltage sampling signal of A phases phase voltage and BC line voltages
2.048V was regarded as zero reference value, and the phase difference calculating of the zero crossing and the zero crossing of BC line voltages of A phase phase voltages is as follows：In A
Phase phase voltage UARising edge zero-acrross ing moment (or trailing edge zero-acrross ing moment) starts the cumulative of variable Tcount, in B phases and C phase top-stitchings
Voltage UBCRising edge zero-acrross ing moment (or trailing edge zero-acrross ing moment) stops the cumulative of variable Tcount, obtains now Tcount value
N, and Δ t=n*0.2ms is calculated, Tcount is reset after the completion of calculating, after obtaining time difference Δ t, calculates phase angle difference ΔΦ：In formula, f be the three phase mains frequency, unit Hz；Time difference Δ t unit is ms.Wherein
Tcount is that a cumulative variable, initial value zero are carried out in 0.2ms Interruptions.
Phase angle difference ΔΦ achieved above cannot be directly used to disconnected mutually judgement, it is necessary to whether be more than 180 ° of progress phases according to it
It should handle：As ΔΦ be more than 180 °, then (180 °-ΔΦ) are assigned to ΔΦ, otherwise, ΔΦ holding it is constant.
Microprocessor according to after processing ΔΦ calculate | 90 °-Δ φ | value, if | 90 °-Δ φ | 30 ° of ＞, B or C phases
Disconnected phase occurs, if | 90 °-Δ φ | 30 ° of ＜, B, C phase are normal.
Similar, the three phase mains for connection load for Y-connection, it is only necessary to change corresponding phase angle difference threshold value i.e.
Can.
Above-mentioned voltage zero-cross a reference value is related to specifically used voltage sampling circuit, such as the rectification circuit in sample circuit
Not connecing voltage lifting circuit afterwards, then corresponding voltage zero-cross a reference value is 0V, as being connected to voltage lifting circuit after rectification circuit,
Then corresponding voltage zero-cross a reference value is lifting voltage.
In addition it should be noted that in the inventive method, the time difference Δ t detected can also be used directly as B, C phase
Disconnected phase basis for estimation, it is only necessary to whether the time difference Δ t detected is more than according to itDoing respective handling, (such as Δ t is more thanThen willΔ t is assigned to, otherwise, Δ t keeps constant), and when default phase difference threshold is converted into corresponding
Between poor threshold value, the two bases for estimation are actually of equal value.Specifically, can basisWhether it is more than default
Time difference threshold value judges, in this way, then shows that disconnected phase occur in B phases or C phases.Correspondingly, it is as the three phase mains connects load
Single triangle connection, then the span of the time difference threshold value isIt is preferred thatAs the three phase mains connects
Load and connected for non-single triangle, then the span of the time difference threshold value isIt is preferred that
The present invention may be directly applied to the phase interruption testing device of existing automatic change-over, it is not necessary to increase any hardware dress
Put, it is only necessary to which simple upgrade is carried out to software program, you can realize being substantially improved for open phase fault Detection accuracy, have fine
Application prospect.
Claims (9)
1. three phase mains open phase fault detection method, it is characterised in that to the phase voltage and the second phase of the phase of three phase mains first
Line voltage between third phase carries out voltage sample respectively, and the first phase phase voltage then is calculated according to voltage sample result
Value, and it is at least one in following two parameter：The phase difference of line voltage between first phase phase voltage and the second phase and third phase
φ, in three phase mains a cycle T rising edge zero-acrross ing moment/trailing edge zero-acrross ing moment of the first phase phase voltage and the second phase with
Time difference Δ t between third phase between rising edge zero-acrross ing moment/trailing edge zero-acrross ing moment of line voltage；Then Δ φ is calculated*Or
Δt*,Then resulting the is utilized
One phase phase voltage and Δ φ*Or/and Δ t*Judge whether the three phase mains open phase fault occurs：If in following condition
Any one is met, then judges that open phase fault occurs in the three phase mains：The value of first phase phase voltage is less than default phase
Voltage threshold, | 90 °-Δ φ*| more than default phase difference threshold,More than default time difference threshold value；As described in
Three phase mains connection load connects for single triangle, then the span of the phase difference threshold is [0 °, 60 °], when described
Between the span of poor threshold value beThe three phase mains connection load as described in is non-single triangle connection, then the phase
The span of potential difference threshold value is [0 °, 30 °], and the span of the time difference threshold value is
2. open phase fault detection method as claimed in claim 1, it is characterised in that the first phase phase voltage and the second phase and third phase
Between line voltage phase difference φ, be calculated according to Δ t：
Δ φ=360 ° × f × Δ t
In formula, f be the three phase mains frequency, unit Hz；Time difference Δ t unit is s.
3. open phase fault detection method as claimed in claim 2, it is characterised in that the rising edge zero-acrross ing moment/trailing edge mistake
The detection method of zero moment is specific as follows：For each voltage sample point, by the magnitude of voltage of current sampling point, a upper sampled point
Magnitude of voltage cross zero reference value with voltage sample respectively compared with, if the magnitude of voltage of current sampling point is more than voltage sample mistake
While zero reference value, the magnitude of voltage of a upper sampled point crosses zero reference value less than or equal to voltage sample, then current sampling point is upper
Rise along zero-acrross ing moment；, whereas if while the magnitude of voltage of current sampling point crosses zero reference value less than voltage sample, a upper sampling
The magnitude of voltage of point crosses zero reference value more than or equal to voltage sample, then current sampling point is trailing edge zero-acrross ing moment.
4. open phase fault detection method as claimed in claim 1, it is characterised in that connect for connection load for single triangle
Connect, the three phase mains of non-single triangle connection, the phase difference threshold is respectively 30 °, 15 °, the time difference threshold value difference
For
5. three phase mains open phase fault detection means, including：It is respectively used to the phase voltage and second to the phase of three phase mains first
Mutually the line voltage between third phase carries out phase voltage sample circuit, the line voltage sample circuit of voltage sample, and and phase voltage
The breakdown judge unit that sample circuit, line voltage sample circuit connect respectively；Characterized in that, the breakdown judge unit includes
Computing module, judge module；The computing module is used to calculate the first phase mutually electricity according to the sampled result of phase voltage sample circuit
It is at least one in the value of pressure, and following two parameter：The phase of line voltage between first phase phase voltage and the second phase and third phase
Poor Δ φ, rising edge zero-acrross ing moment/trailing edge zero-acrross ing moment and second of the first phase phase voltage in three phase mains a cycle T
The mutually time difference Δ t between third phase between rising edge zero-acrross ing moment/trailing edge zero-acrross ing moment of line voltage, then calculates Δ
φ*Or Δ t*, The judge module is used
In the output result according to computing module, the first resulting phase phase voltage and Δ φ are utilized*Or/and Δ t*Judge described three
Whether phase power supply there is open phase fault：If any one in following condition is met, judge that the three phase mains goes out
Existing open phase fault：The value of first phase phase voltage is less than default phase voltage threshold value, | 90 °-Δ φ*| more than default phase difference threshold
Value,More than default time difference threshold value；Connected as the three phase mains connection loads for single triangle, then institute
The span for stating phase difference threshold is [0 °, 60 °], and the span of the time difference threshold value isSuch as the three-phase
Power supply connection load is non-single triangle connection, then the span of the phase difference threshold is [0 °, 30 °], the time
The span of poor threshold value is
6. open phase fault detection means as claimed in claim 5, it is characterised in that the computing module includes zero-crossing timing difference inspection
Survey submodule, phasometer operator module；The zero-crossing timing difference detection sub-module is used for the week in the three phase mains
In phase, it is utilized respectively voltage sample result and detects rising edge zero-acrross ing moment/trailing edge zero-acrross ing moment of the first phase phase voltage,
Rising edge zero-acrross ing moment/trailing edge zero-acrross ing moment of line voltage between two-phase and third phase, and calculate both time difference Δ t；
The phasometer operator module is used to line voltage between the first phase phase voltage and the second phase and third phase be calculated according to the following formula
Phase difference φ：
Δ φ=360 ° × f × Δ t
In formula, f be the three phase mains frequency, unit Hz；Time difference Δ t unit is s.
7. open phase fault detection means as claimed in claim 6, it is characterised in that the rising edge zero-acrross ing moment/trailing edge mistake
The detection method of zero moment is specific as follows：For each voltage sample point, by the magnitude of voltage of current sampling point, a upper sampled point
Magnitude of voltage cross zero reference value with voltage sample respectively compared with, if the magnitude of voltage of current sampling point is more than voltage sample mistake
While zero reference value, the magnitude of voltage of a upper sampled point crosses zero reference value less than or equal to voltage sample, then current sampling point is upper
Rise along zero-acrross ing moment；, whereas if while the magnitude of voltage of current sampling point crosses zero reference value less than voltage sample, a upper sampling
The magnitude of voltage of point crosses zero reference value more than or equal to voltage sample, then current sampling point is trailing edge zero-acrross ing moment.
8. open phase fault detection means as claimed in claim 5, it is characterised in that connect for connection load for single triangle
Connect, the three phase mains of non-single triangle connection, the phase difference threshold is respectively 30 °, 15 °, the time difference threshold value difference
For
9. a kind of automatic change-over, including the three phase mains open phase fault detection means as described in any one of claim 5~8.
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| CN201510698591.9A CN105203911B (en) | 2015-10-26 | 2015-10-26 | Three phase mains open phase fault detection method, device and a kind of automatic change-over |
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| CN106018983A (en) * | 2016-07-13 | 2016-10-12 | 苏州长量电器有限公司 | Phase failure detection single-sided comprehensive detection method |
| CN106253232B (en) * | 2016-08-26 | 2018-07-20 | 扬州电力设备修造厂有限公司 | Open phases of three-phase power source detection method and motor phase failure protect system in a kind of motor operation |
| CN106501673B (en) * | 2016-10-21 | 2019-03-08 | 国网江苏省电力有限公司检修分公司 | A Normal Harmonic Discrimination Method Based on Measured Current Traveling Wave of Transmission Line Hidden Discharge |
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| CN109613386B (en) * | 2019-01-04 | 2020-10-02 | 常熟开关制造有限公司(原常熟开关厂） | Method and device for detecting misconnection of zero lines of three-phase power supply incoming line and automatic change-over switch |
| CN112578306A (en) * | 2020-12-28 | 2021-03-30 | 施耐德万高（天津）电气设备有限公司 | Three-phase power supply fault identification method based on phase angle monitoring |
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| CN114660500B (en) * | 2022-05-19 | 2022-08-19 | 秦皇岛广控科技有限公司 | Three-phase monitoring protection system |
| CN114878927A (en) * | 2022-06-20 | 2022-08-09 | 广东美的暖通设备有限公司 | Phase-loss detection method and device, frequency converter, motor and electric equipment |
| CN115015797B (en) * | 2022-08-08 | 2022-10-14 | 深圳市恒运昌真空技术有限公司 | Radio frequency power supply signal acquisition method and device |
| CN117706279B (en) * | 2024-02-05 | 2024-05-24 | 青岛鼎信通讯科技有限公司 | Phase failure fault diagnosis method for low-voltage distribution system |
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