CN110265972A - A kind of zero-sequence current protection setting method - Google Patents
A kind of zero-sequence current protection setting method Download PDFInfo
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- CN110265972A CN110265972A CN201910516112.5A CN201910516112A CN110265972A CN 110265972 A CN110265972 A CN 110265972A CN 201910516112 A CN201910516112 A CN 201910516112A CN 110265972 A CN110265972 A CN 110265972A
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- 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
- H02H3/006—Calibration or setting of parameters
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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
Abstract
The invention discloses a kind of zero-sequence current protection setting methods, comprising: chooses unsaturated preferred phase, and obtains the winding current of unsaturated preferably phase；Using the winding current of unsaturated preferably phase, the corresponding transformer windings standard of any point-in-time is calculated from leakage inductance value, identifies unsaturated time interval；The transformer windings standard calculated in unsaturated time interval obtains transformer windings from leakage inductance value from leakage inductance average value, and obtains transformer secondary winding from leakage inductance value from leakage inductance value and transformer short-circuit leakage inductance according to transformer windings；According to transformer windings from leakage inductance value and transformer secondary winding from leakage inductance value, obtains zero mould under all divide-shut brake angle combinations and shove fundamental wave virtual value；It is shoved fundamental wave virtual value and safety factor according to zero mould maximum under all divide-shut brake angle combinations, obtains zero-sequence over-current protection setting valve.Zero-sequence over-current protection malfunction caused by the method for the present invention can be avoided effectively because of inrush current of transformer improves the safety of system operation.
Description
Technical field
The invention belongs to Relay Protection Technology in Power System fields, adjust more particularly, to a kind of zero-sequence current protection
Method.
Background technique
The zero-sequence current that zero-sequence current protection generates when referring to using ground connection makes the device of protection act, neutral-point solid ground
Ground short circuit occurs for system, will generate very big zero-sequence current, is constituted and protected using zero-sequence current component, can be used as a kind of master
The earthing short circuit protection wanted.And it is the selectivity for guaranteeing zero-sequence over-current protection, guarantee it only in the protection model of zero-sequence over-current protection
Movement when enclosing interior generation ground short circuit failure needs to adjust movement definite value.
Current setting method generally has: being likely to occur when 1, escaping single-phase at junior's line outlet or two-phase grounding fault
Maximum zero sequence current；2, the maximum zero sequence current occurred when escaping breaker three-phase contact breakers asynchronous closing；3, when on route
When using single phase autoreclosing, the maximum zero sequence current occurred when vibrating under non-full-operating state again is escaped.
Current setting method does not account for the maximum zero sequence electricity that excitation surge current three-phase imbalance generates when transformer puts into operation
Stream.When the transformer of past conventional structure puts into operation excitation surge current three-phase imbalance generate zero-sequence current it is smaller, caused by influence
It is not serious.And in recent years, for limiting short-circuit current, high pressure internally-arranged type high-impedance transformer (referred to as " built-in change ") has obtained big
Amount application, the zero-sequence current that built-in change generates when putting into operation is very big, zero-sequence over-current protection malfunction is repeatedly caused, to system safety operation
Bring serious threat, it is therefore desirable to propose that the maximum that excitation surge current three-phase imbalance generates when transformer puts into operation can be avoided
The setting method of zero-sequence current, and the key of maximum zero sequence current adjusting is to seek transformer in all divide-shut brake angle combinations
Under maximum zero sequence current, that is, seek zero mould of maximum fundamental wave virtual value and shove.
Zero mould shove size in addition to combined floodgate operating condition mutually outside the Pass, also with transformer windings from leakage inductance and secondary winding from
Leakage inductance size is related, it is considered that, windings are equal from leakage inductance and secondary winding from leakage inductance, and two sides are respectively total leakage inductance from leakage inductance
Half, but actually two sides might not be equal from leakage inductance, represents the magnetic linkage only to interlink with itself winding in transformation from leakage inductance
The size of corresponding inductance in the differential equation of device circuit, the magnetic linkage can be influenced by iron core winding construction and size, therefore at certain
In a little special transformers, such as the high-impedance transformer increased mainly leakage inductance of low-pressure side, high-pressure side is almost unchanged, two side leakages
Sense numerical value differs greatly, and needs to measure respectively, but existing transformer windings natural leak sensed quantity method needs use original side
Winding and secondary winding side's voltage and current, measurement method are complex.
In general, existing zero-sequence current setting method is uneven due to not accounting for excitation surge current three-phase when transformer puts into operation
Weigh the maximum zero sequence current generated, there are problems that zero-sequence over-current protection malfunction, threatens system safety operation, while adjusting
Transformer windings are also complex from leakage inductance and secondary winding from the measurement of leakage inductance in journey.
Summary of the invention
In view of the drawbacks of the prior art, the purpose of the present invention is to provide a kind of zero-sequence current protection setting methods, it is intended to
Solving existing zero-sequence current setting method, there are zero-sequence over-current protection malfunctions, while transformer windings natural leak in tuning process
Sense and secondary winding measure also complex problem from leakage inductance.
To achieve the above object, the present invention provides a kind of zero-sequence current protection setting methods, comprising:
(1) using the smallest phase of peak absolute value in windings electric current in transformer during no-load closing the latter period as not
It is saturated preferred phase, and obtains the winding current of the unsaturated preferably phase；
(2) using the winding current of the unsaturated preferably phase, the corresponding transformer windings of any point-in-time are calculated
Standard from leakage inductance value, when in the time interval being calculated any two transformer windings standard from leakage inductance difference lower than setting
Value, then using the time interval as unsaturated time interval；
(3) the transformer windings standard in the unsaturated time interval is calculated from leakage inductance average value, obtains transformer
Windings obtain transformer from leakage inductance value and transformer short-circuit leakage inductance from leakage inductance value, and according to the transformer windings
Secondary winding is from leakage inductance value；
(4) all points are obtained from leakage inductance value and transformer secondary winding from leakage inductance value according to the transformer windings
Zero mould under combined floodgate angle combinations shoves fundamental wave virtual value；
(5) it is shoved fundamental wave virtual value and safety factor according to zero mould maximum under all divide-shut brake angle combinations, obtains zero
Sequence overcurrent protection setting valve.
Further, any point-in-time pair is calculated using the winding current of the unsaturated preferably phase described in step (2)
The transformer windings standard answered from leakage inductance value, specifically:
According to transformer primary side's winding three-phase electric current, transformer primary side's winding three-phase voltage, transformer short-circuit leakage inductance, star-like
The winding current of side neutral point voltage and the unsaturated preferably phase, obtains transformer windings standard from leakage inductance value.
Further, calculation expression of the transformer windings standard from leakage inductance value are as follows:
Wherein, u0It is zero mode voltage, u0=(uAT+uBT+cCT)/3, uAT、uBT、uCTFor transformer primary side's winding three-phase voltage,
i0It is that zero mould shoves, i0=(iA+iB+iC)/3, iA、iB、iCFor transformer primary side's winding three-phase electric current, uNFor star-like side neutral point
Voltage, LKFor transformer short-circuit leakage inductance, iXFor the winding current of unsaturated preferably phase.
Further, the corresponding transformer windings standard of calculating any point-in-time described in step (2) is needed from leakage inductance value
Discretization is carried out from the calculation expression of leakage inductance value to the transformer windings standard, is obtained:
Wherein, LσWIt (k) is transformer windings standard from leakage inductance discrete value, k is to calculate time point, and Δ T is the sampling interval.
Further, step (4) specifically includes,
(4.1) it is counted according to the transformer windings being calculated from leakage inductance value and transformer secondary winding from leakage inductance value
Zero mould under all divide-shut brake angle combinations is calculated to shove instantaneous value；
(4.2) to zero mould of all divide-shut brake angle combinations shove instantaneous value carry out fast Fourier transform, obtain zero
Mould shoves fundamental wave virtual value.
Further, the calculation expression that zero mould shoves are as follows:
Wherein, UsFor system voltage, LairFor transformer air core inductor, Ls0For system zero sequence inductance, LσFor transformer primary side
Winding is from leakage inductance value, LσDIt is transformer secondary winding from leakage inductance value, BJ(t) saturation magnetic induction is accounted for for iron core flux density unsaturated part
Percentage, BrThe percentage of saturation magnetic induction is accounted for for three-phase remanent magnetism flux density.
Further, the iron core flux density unsaturated part accounts for the percentage B of saturation magnetic inductionJ(t) expression formula are as follows:
Wherein, α is the level angle of A phase when combined floodgate puts into operation.
Further, the three-phase remanent magnetism flux density accounts for the percentage B of saturation flux flux densityrExpression formula are as follows:
Wherein, the level angle of A phase when θ is last separating brake.
Contemplated above technical scheme through the invention, compared with prior art, can obtain it is following the utility model has the advantages that
(1) present invention seeks when transformer puts into operation excitation surge current three-phase imbalance using the method for mathematical analysis and generates most
Big zero-sequence current seeks result precision height and easily operated, the zero-sequence current generated when effectively transformer can be avoided to put into operation
It is larger, and the problem of cause zero-sequence over-current protection malfunction, improve the safety of system operation.
(2) in zero-sequence current protection tuning process of the invention, transformer windings are from leakage inductance and secondary winding natural leak
The voltage and current that windings are only needed in inductance value calculating process, it is easy to operate without measuring the voltage and current of secondary winding
It is convenient, and transformer neutral point ground connection and it is earth-free when can all apply, strong applicability.
Detailed description of the invention
Fig. 1 is a kind of zero-sequence current protection setting method flow diagram provided by the invention；
Fig. 2 is Y/delta wiring transformer structure chart；
Fig. 3 (a) is neutral ground Shi Yuanfang three-phase windings current curve diagram provided in an embodiment of the present invention；
The quasi- natural leak of transformer windings being calculated when Fig. 3 (b) is neutral ground provided in an embodiment of the present invention
Inductance value；
Fig. 4 (a) is isolated neutral Shi Yuanfang three-phase windings current curve diagram provided in an embodiment of the present invention；
The transformer windings standard being calculated when Fig. 4 (b) is isolated neutral provided in an embodiment of the present invention is certainly
Leakage inductance value；
Fig. 5 (a) and Fig. 5 (b) are that zero mould under all divide-shut brake angle combinations shoves the audio-visual picture of fundamental wave virtual value respectively
And top view.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The present invention provides a kind of zero-sequence current protection setting methods, comprising:
(1) using the smallest phase of peak absolute value in windings electric current in transformer during no-load closing the latter period as not
It is saturated preferred phase, and obtains the winding current of the unsaturated preferably phase；
Specifically, when transformer during no-load closing, tri-phase iron core can not be saturated simultaneously, always there is the insatiable hunger always of a certain phase
With, or enter saturation time it is later, this is mutually referred to as unsaturated preferred phase, and it is unsaturated when, exciting current (windings and
The sum of secondary winding current value) very little, it is believed that exciting current 0, but influenced at this time by secondary winding circulation, it is unsaturated
The windings of phase can generate the primary current i offseted with secondary winding circulationX(be mutually X phase assuming that unsaturated, X ∈ A, B,
C), then the winding current and secondary winding circulation of unsaturated phase opposite number each other in unsaturated section；Due to windings electricity
Flow smaller, unsaturated section is bigger, to keep unsaturated section as big as possible, and then effectively identifies unsaturated time interval, this hair
It is bright preferred using the smallest phase of peak absolute value in windings electric current in transformer during no-load closing the latter period as unsaturation
Phase X.
(2) using the winding current of the unsaturated preferably phase, the corresponding transformer windings of any point-in-time are calculated
Standard is from leakage inductance value, when any two transformer windings standard being calculated in certain time interval is lower than setting from leakage inductance difference
Value, then using the time interval as unsaturated time interval；
Specifically, Y/delta wiring transformer structure is as shown in Fig. 2, electricity reduction is to high-pressure side, transformer circuit side in figure
Journey may be expressed as:
Wherein, uAT、uBT、uCTFor transformer primary side's winding three-phase voltage, uNFor star-like side neutral point voltage, R windings
Resistance, iA、iB、iCRespectively transformer primary side's winding three-phase electric current, ea, eb, ecFor Three-Phase Transformer field excitation branch line induction electric
Gesture, LσIt is transformer windings from leakage inductance；
Secondary winding meets equation:
Wherein, ua、ub、ucRespectively transformer secondary winding voltage, r are secondary winding resistance, ia、ib、icRespectively become
Depressor secondary winding electric current, iDFor secondary winding circulation, LσDIt is transformer secondary winding from leakage inductance；
Joint type (1) and (2), obtain:
Another u0=(uAT+uBT+cCT)/3, i0=(iA+iB+iC)/3 obtain:
Negligible resistance component when resistance is smaller, obtains:
Simultaneous short circuit leakage inductance expression formula is Lσ+LσD=LKWherein, LKFor transformer short-circuit leakage inductance, obtain transformer primary side around
Calculation expression of the group from leakage inductance value:
Utilize the winding current i of unsaturated phaseXInstead of secondary winding circulation iD, transformer windings standard is obtained from leakage inductance
The final calculation expression of value:
The corresponding transformer windings standard of any point-in-time is calculated from leakage inductance value, discretization need to be carried out to formula (7), obtained
It arrives:
Wherein, LσWIt (k) is transformer windings standard from leakage inductance discrete value, k is to calculate time point, and Δ T is the sampling interval；
Due to being not aware that unsaturated precise time section in advance, or even unsaturated time interval both ends boundary is also mould
Paste, but in the section, what is be calculated can be close to a steady state value from leakage inductance value.Therefore, by judging two transformations
Whether device windings are lower than setting value from leakage inductance difference, and to identify unsaturated time interval, the embodiment of the present invention chooses short circuit
Leakage inductance LK1% be used as setting value.
(3) the transformer windings standard in the unsaturated time interval is calculated from leakage inductance average value, obtains transformer
Windings obtain transformer from leakage inductance value and transformer short-circuit leakage inductance from leakage inductance value, and according to the transformer windings
Secondary winding is from leakage inductance value；
(4) all points are obtained from leakage inductance value and transformer secondary winding from leakage inductance value according to the transformer windings
Zero mould under combined floodgate angle combinations shoves fundamental wave virtual value；
Specifically, step (4) specifically includes,
(4.1) it is counted according to the transformer windings being calculated from leakage inductance value and transformer secondary winding from leakage inductance value
Zero mould under all divide-shut brake angle combinations is calculated to shove instantaneous value；
The calculation expression that zero mould shoves are as follows:
Wherein, UsFor system voltage, LairFor transformer air core inductor, Ls0For system zero sequence inductance, LσFor transformer primary side
Winding is from leakage inductance value, LσDIt is transformer secondary winding from leakage inductance value, is known；BJ(t) it is accounted for for iron core flux density unsaturated part
The percentage of saturation magnetic induction, expression formula are as follows:
Wherein, α is the level angle of A phase when combined floodgate puts into operation.
BrThe percentage of saturation flux flux density, expression formula are accounted for for three-phase remanent magnetism flux density are as follows:
Wherein, the level angle of A phase when θ is last separating brake.
Because of three-phase symmetrical, the sum of three-phase remanent magnetism is zero in formula (9), i.e.,The windings natural leak that will be obtained
Sense and secondary winding are brought into from leakage inductance and known parameters, are obtained:
(4.2) to zero mould under all divide-shut brake angle combinations shove instantaneous value carry out fast Fourier transform, obtain zero mould
Shove fundamental wave virtual value.
Specifically, α, β are calculated from 0 °~360 ° (2 ° of interval) traversals, and zero mould obtained under all divide-shut brake angle combinations gushes
Flow instantaneous value, to zero mould shove instantaneous value carry out FFT (Fast Fourier Transformation, fast Fourier transform) meter
It calculates, obtains zero mould and shove fundamental wave virtual value IB。
(5) it is shoved fundamental wave virtual value and safety factor according to zero mould maximum under all divide-shut brake angle combinations, obtains zero
Sequence overcurrent protection setting valve.
Specifically, the maximum value I of fundamental wave virtual value under all divide-shut brake angle combinations is foundBmax, multiplied by safety factor
Krel, obtain new zero-sequence over-current protection setting valve I0set=Krel·IBmax。
In order to verify the correctness of calculation of circulating current method proposed in this paper, transformer emulation system is established using PSCAD software
System simulating actual conditions.It is 240/80MVA with capacity, the high-impedance transformer that voltage rating no-load voltage ratio is 220/10.5kV is former
Type, high-low pressure short-circuit reactance percentage are 36% (0.2311H), and high-pressure side, low-pressure side leakage reactance percentage are respectively 14% (famous
Value: 0.0899H), 22% (famous value: 0.1412H)；Since total leakage reactance percentage can only be inputted in PSCAD simulation model, height
Pressure side cannot be respectively set, and the present embodiment takes a kind of transform method, and the saturation current source for simulating field excitation branch line is placed in high pressure
Side, while high voltage side of transformer impedance is added in system side, low-pressure side is defeated as short-circuit impedance percentage from leakage reactance percentage
Enter for model.By calculating, the resistance that high-pressure side is added is 0.2 Ω and inductance is 0.0899H, when obtaining transformer during no-load closing
Electricity data calculated.
Fig. 3 (a) thick line represents the selected preferred phase of unsaturation, is calculated according to formula (8), obtains neutrality shown in Fig. 3 (b)
Leakage inductance value change curve when point ground connection, unsaturated section recognition result is as shown in dotted line in Fig. 3 (b)；Thick line generation in Fig. 4 (a)
The selected preferred phase of unsaturation of table, is calculated according to formula (8), obtains leakage inductance value when isolated neutral shown in Fig. 4 (b)
Change curve, unsaturated section recognition result is as shown in dotted line in Fig. 4 (b)；To corresponding transformer primary side in unsaturated section
Standard is averaged calculating from leakage inductance, has obtained leakage inductance value L σ in neutral ground and earth-free situation, respectively 0.0898H and
0.0896H, compared with actual value 0.0899H, error is only 0.1% and 0.3%, and calculated result is more accurate.
The transformer windings acquired are brought into zero mould from leakage inductance from leakage inductance and secondary winding to shove expression formula (9), obtain
It shoves to zero mould known to coefficient and institute is made according to formula mathematical analysis respectively about the function expression (12) of divide-shut brake angle
There is zero mould under divide-shut brake angle combinations to shove fundamental wave virtual value, as shown in Fig. 5 (a) and Fig. 5 (b), obtains fundamental wave virtual value most
Big value IBmaxFor 1.5kA, usual safety factor KrelIt is 1.2, so new zero-sequence over-current protection setting valve is I0set=Krel·
IBmax=1.8kA.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (8)
1. a kind of zero-sequence current protection setting method characterized by comprising
(1) using the smallest phase of peak absolute value in windings electric current in transformer during no-load closing the latter period as unsaturation
It is preferred that phase, and obtain the winding current of the unsaturated preferably phase；
(2) using the winding current of the unsaturated preferably phase, the corresponding transformer windings standard of any point-in-time is calculated certainly
Leakage inductance value, when in the time interval being calculated any two transformer windings standard from leakage inductance difference be lower than setting value, then
Using the time interval as unsaturated time interval；
(3) the transformer windings standard in the unsaturated time interval is calculated from leakage inductance average value, obtains transformer primary side
Winding obtains transformer pair side from leakage inductance value and transformer short-circuit leakage inductance from leakage inductance value, and according to the transformer windings
Winding is from leakage inductance value；
(4) all divide-shut brakes are obtained from leakage inductance value and transformer secondary winding from leakage inductance value according to the transformer windings
Zero mould under angle combinations shoves fundamental wave virtual value；
(5) it is shoved fundamental wave virtual value and safety factor according to zero mould maximum under all divide-shut brake angle combinations, obtains zero sequence mistake
Flow protection seting value.
2. a kind of zero-sequence current protection setting method according to claim 1, which is characterized in that benefit described in step (2)
With the winding current of the unsaturated preferably phase, the corresponding transformer windings standard of any point-in-time is calculated from leakage inductance value, tool
Body are as follows:
According in transformer primary side's winding three-phase electric current, transformer primary side's winding three-phase voltage, transformer short-circuit leakage inductance, star-like side
Property point voltage and the unsaturated preferably phase winding current, obtain transformer windings standard from leakage inductance value.
3. a kind of zero-sequence current protection setting method according to claim 2, which is characterized in that the transformer primary side around
The quasi- calculating formula from leakage inductance value of group are as follows:
Wherein, u0It is zero mode voltage, u0=(uAT+uBT+cCT)/3, uAT、uBT、uCTFor transformer primary side's winding three-phase voltage, i0For
Zero mould shoves, i0=(iA+iB+iC)/3, iA、iB、iCFor transformer primary side's winding three-phase electric current, uNFor star-like side neutral point voltage,
LKFor transformer short-circuit leakage inductance, iXFor the winding current of unsaturated preferably phase.
4. a kind of zero-sequence current protection setting method according to claim 3, which is characterized in that counted described in step (2)
The corresponding transformer windings standard of any point-in-time is calculated from leakage inductance value, it need to be to the transformer windings standard from leakage inductance value
Calculation expression carries out discretization, obtains:
Wherein, LσWIt (k) is transformer windings standard from leakage inductance discrete value, k is to calculate time point, and Δ T is the sampling interval.
5. a kind of zero-sequence current protection setting method according to claim 1-4, which is characterized in that step (4)
It specifically includes,
(4.1) institute is calculated from leakage inductance value and transformer secondary winding from leakage inductance value according to the transformer windings being calculated
There is zero mould under divide-shut brake angle combinations to shove instantaneous value；
(4.2) to zero mould of all divide-shut brake angle combinations shove instantaneous value carry out fast Fourier transform, obtain zero mould and gush
Flow fundamental wave virtual value.
6. a kind of zero-sequence current protection setting method according to claim 5, which is characterized in that the meter that zero mould shoves
Operator expression formula are as follows:
Wherein, UsFor system voltage, LairFor transformer air core inductor, Ls0For system zero sequence inductance, LσFor transformer windings
From leakage inductance value, LσDIt is transformer secondary winding from leakage inductance value, BJ(t) percentage of saturation magnetic induction is accounted for for iron core flux density unsaturated part
Number, BrThe percentage of saturation magnetic induction is accounted for for three-phase remanent magnetism flux density.
7. a kind of zero-sequence current protection setting method according to claim 6, which is characterized in that the iron core flux density insatiable hunger
Partially account for the percentage B of saturation magnetic inductionJ(t) expression formula are as follows:
Wherein, α is the level angle of A phase when combined floodgate puts into operation.
8. a kind of zero-sequence current protection setting method according to claim 6, which is characterized in that the three-phase remanent magnetism flux density
Account for the percentage B of saturation flux flux densityrExpression formula are as follows:
Wherein, the level angle of A phase when θ is last separating brake.
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| CN111654008A (en) * | 2020-06-09 | 2020-09-11 | 中国南方电网有限责任公司 | Temporary zero-sequence overcurrent protection engineering setting method and system for transformer |
| CN113176522A (en) * | 2021-04-16 | 2021-07-27 | 国网江苏省电力有限公司南通供电分公司 | Transformer short-circuit fault detection method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110854800A (en) * | 2019-09-29 | 2020-02-28 | 广东电网有限责任公司 | Zero-sequence over-current setting method, device and equipment |
| CN110854800B (en) * | 2019-09-29 | 2022-01-21 | 广东电网有限责任公司 | Zero-sequence over-current setting method, device and equipment |
| CN111654008A (en) * | 2020-06-09 | 2020-09-11 | 中国南方电网有限责任公司 | Temporary zero-sequence overcurrent protection engineering setting method and system for transformer |
| CN111654008B (en) * | 2020-06-09 | 2022-05-13 | 中国南方电网有限责任公司 | Temporary zero-sequence overcurrent protection engineering setting method and system for transformer |
| CN113176522A (en) * | 2021-04-16 | 2021-07-27 | 国网江苏省电力有限公司南通供电分公司 | Transformer short-circuit fault detection method |
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