CN109270449A - The prior-warning device and method of high pressure GIS switching point voltage mutual inductor ferromagnetic resonance - Google Patents
The prior-warning device and method of high pressure GIS switching point voltage mutual inductor ferromagnetic resonance Download PDFInfo
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- 230000005350 ferromagnetic resonance Effects 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 18
- 125000006850 spacer group Chemical group 0.000 claims abstract description 25
- 238000012544 monitoring process Methods 0.000 claims abstract description 12
- 208000033748 Device issues Diseases 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 239000003990 capacitor Substances 0.000 description 5
- 230000010355 oscillation Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 230000005294 ferromagnetic effect Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000005291 magnetic effect Effects 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
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Abstract
The invention discloses the prior-warning devices and method of a kind of high pressure GIS switching point voltage mutual inductor ferromagnetic resonance, including Ferroresonance Overvoltage Caused by PT prior-warning device, the breaker quartile signal acquisition module is acquired the circuit breaker position contact of each GIS spacer units, the voltage signal acquisition module is acquired voltage transformer secondary side three-phase phase voltage, and the breaker quartile signal acquisition module is electrically connected with ferromagnetic resonance pre-warning signal output module respectively with voltage signal acquisition module.Compared with prior art, the present invention can be after the operation of high voltage switchyard primary equipment or breaker emergency stop valve trip, when ferromagnetic resonance occurs for GIS spacer units, accurately judge, and pre-warning signal quickly is exported to monitoring system, quickly operations staff is reminded to take timely measure handling failure, avoids the serious accident of occurrence of equipment scaling loss.
Description
Technical field
The present invention relates to the high pressure GIS switchyards more particularly to a kind of high pressure GIS switching point voltage in a kind of electric system
Mutual inductor ferromagnetic resonance prior-warning device and method.
Background technique
At present in electric system high pressure GIS switchyard, improvement fracture voltage is typically arranged between high-voltage circuitbreaker fracture
The shunt capacitor of distribution character, in certain specific occasion, when being disconnected such as the last one breaker of bus power failure operation, GIS
When some equipment interval (including main transformer, route, bus interval) the last one breaker of power failure operation disconnects, in the interval
Voltage transformer is possible to that lasting low frequency high voltage can be generated, i.e. ferromagnetic resonance has occurred in the voltage transformer.
When Ferroresonance Overvoltage Caused by PT occurs, the overvoltage more than voltage rating several times may be generated, short
If not adopting an effective measure processing in a few minutes, exciting current is very big, after some time it is possible to reach several hundred or even thousands of times of normal current,
It will cause voltage transformer overheat scaling loss.Because ferromagnetic resonance can generate high voltage, such as it cannot find and handle in time, electricity will be caused
It presses mutual inductor insulation impaired, even results in equipment damage；Especially in unforeseen emergency stop valve trip, artificial hair in time
The difficulty of existing resonance is bigger, it is easier to voltage transformer be caused to be damaged.
In current electric system, the method for use is run on duty after high voltage switchyard primary equipment grid switching operation
Personnel by observation failure wave-recording waveform, listen attentively to primary equipment sound, check that voltage transformer voltage the means such as shows and finds
Ferromagnetic resonance takes a long time and is not easy to find ferromagnetic resonance, be easy to cause troubleshooting not in time, it can jeopardize voltage transformer
Insulation, and voltage transformer is caused to be damaged；Especially in unforeseen emergency stop valve trip, manually find in time ferromagnetic
The difficulty of resonance is bigger, it is easier to voltage transformer be caused to be damaged.All there is hysteresis quality to the failure cause and judgement at present,
Do not furtherd investigate and designed solution.
Summary of the invention
It solves the above problems the object of the invention is that providing one kind, when switching station equipment generation resonance, sends pre-
Alert signal is reminded operator to pull open resonance interval unit breaker in time by voltage transformer side disconnecting switch, is destroyed
Resonant parameter avoids resonance from causing equipment scaling loss, and the high pressure GIS switching point voltage that resonance is preferably minimized the harm of equipment is mutual
The prior-warning device and method of sensor ferromagnetic resonance.
To achieve the goals above, the technical solution adopted by the present invention is that: a kind of high pressure GIS switching point voltage mutual inductor iron
The prior-warning device of magnetic resonance, including Ferroresonance Overvoltage Caused by PT prior-warning device, the Ferroresonance Overvoltage Caused by PT early warning dress
It sets and is made of breaker quartile signal acquisition module, voltage signal acquisition module and ferromagnetic resonance pre-warning signal output module, institute
It states breaker quartile signal acquisition module to be acquired the circuit breaker position contact of each GIS spacer units, the voltage signal
Acquisition module is acquired voltage transformer secondary side three-phase phase voltage, the breaker quartile signal acquisition module and voltage
Signal acquisition module is electrically connected with ferromagnetic resonance pre-warning signal output module respectively.
Preferably, the breaker quartile signal acquisition module is to the breaker quartile of each GIS spacer units and right
The breaker secondary side stable state phase voltage U φ of GIS spacer units is acquired.
Preferably, the breaker quartile signal acquisition module further includes timer, the timer is between pulling open GIS
It is acquired every the time T and setting time Tset that unit the last one breaker starts timing.
Preferably, the ferromagnetic resonance pre-warning signal output module carries out threshold value setting and carries out pre-warning signal transmission.
Preferably, the monitoring system communication in the ferromagnetic resonance pre-warning signal output module and electric system is repeatedly
It connects.
A kind of method for early warning of high pressure GIS switching point voltage mutual inductor ferromagnetic resonance, in the high voltage switchyard of electric system
Ferroresonance Overvoltage Caused by PT prior-warning device is installed, by the breaker secondary side for acquiring breaker quartile and GIS spacer units
Stable state phase voltage U φ starts timing T when pulling open the last one breaker of GIS spacer units, is exceeding setting time Tset
Afterwards, any one phase stable state phase voltage of Ferroresonance Overvoltage Caused by PT prior-warning device acquisition or stable state frequency dividing phase voltage are more than that its is right
The early warning definite value answered, then ferromagnetic resonance prior-warning device issues alarm signal and is transported to monitoring system, to carry out ferromagnetic resonance
Warning function.
Preferably, the breaker secondary side stable state phase voltage U φ to GIS spacer units carries out scaling down processing, calculate
Secondary side 1/3,1/5,1/7 divides stable state phase voltage, respectively U φ (f0/3)、Uφ(f0/5)、Uφ(f0/7)。
Preferably, the value of the setting time Tset is 0.2s-0.5s.
Preferably, the early warning definite value under setting time Tset is that secondary side stable state divides phase voltage definite value U φ (f0/3)
.set、Uφ(f0/5).set、Uφ(f0/ 7) .set and secondary side stable state phase voltage definite value U φ .set.
Preferably, the secondary side stable state divides phase voltage definite value U φ (f0/3).set、Uφ(f0/5).set、Uφ
(f0/ 7) .set value is 4V-8V；The value of the secondary side stable state phase voltage definite value U φ .set is voltage transformer secondary side
The 1/3 of specified phase voltage.
Compared with the prior art, the advantages of the present invention are as follows: the present invention can operate or break in high voltage switchyard primary equipment
It after the device emergency stop valve trip of road, when ferromagnetic resonance occurs for GIS spacer units, accurately judges, and quickly pre- to monitoring system output
Alert signal, quickly reminds operations staff to take timely measure handling failure, avoids the serious accident of occurrence of equipment scaling loss.
Detailed description of the invention
Fig. 1 is single bus scheme exemplary diagram；
Fig. 2 is ferromagnetic resonance equivalent circuit figure；
Fig. 3 is the oscillation due to discharge form figure of static capacity；
Fig. 4 is voltage transformer excitation property figure；
Fig. 5 is current graph when C2 discharges on L；
Fig. 6 is f0/3 Subharmonic Resonance primary side voltage oscillogram；
Fig. 7 is f0/5 Subharmonic Resonance primary side voltage oscillogram；
Fig. 8 is f0/7 Subharmonic Resonance primary side voltage oscillogram；
Fig. 9 is Ferroresonance Overvoltage Caused by PT prior-warning device logic chart；
Figure 10 is that Ferroresonance Overvoltage Caused by PT prior-warning device realizes schematic diagram.
Specific embodiment
The invention will be further described below.
Embodiment: technical problem analysis: by being cutd open to operation ferromagnetic resonance situation in electric system high pressure GIS switchyard
Analysis,
The occurrence condition of 1.1 Ferroresonance Overvoltage Caused by PT
GIS high voltage switchyard ferromagnetic resonance is by the direct-to-ground capacitance and voltage of capacitor, GIS bus between breaker fracture
What the series LC circuit that the nonlinear inductance of mutual inductor is constituted generated under given conditions.Voltage transformer is easy to produce ferromagnetic
The condition of resonance is as follows:
1, each phase of breaker must have more than one arc-control device (containing equalizing capacitor).
2, voltage transformer is necessarily mounted in sub-fraction GIS device, and one end of GIS device must install in this section
One or more breakers, and install one or more disconnecting switch in the other end, by the part not with overhead line, cable outlet
Or transformer is connected.
3, breaker or disconnecting switch must be disconnected, their sides opposite with voltage transformer must be charged.
The phenomenon that 1.2 Ferroresonance Overvoltage Caused by PT process
By taking certain 500kV high voltage switchyard as an example, which uses single bus scheme mode, as shown in Figure 1,
Wherein GCB indicates that breaker, DS indicate disconnecting switch, and VT indicates voltage transformer.When the method for operation changes, if GCB2,
GCB3 separating brake, the last separating brake of GCB1, then ferromagnetic resonance may occur for voltage transformer VT.Show referring to Fig. 1 single bus scheme
Example: breaker fracture is configured with shunt capacitor in Fig. 1；Its ferromagnetic resonance equivalent circuit such as Fig. 2, wherein C1 indicates that breaker is disconnected
Mouth capacitor, C2 indicate that GIS bus direct-to-ground capacitance, R indicate that voltage transformer primary coil resistance, L indicate voltage transformer inductance,
E indicates supply voltage.
1.2.1 the oscillation due to discharge form of static capacity
The moment that GCB has just turned off, remaining charge (peak value that maximum is equivalent to E) can be to L on GIS bus direct-to-ground capacitance C2
It discharges.The general very little of C2 (thousands of pF) under normal conditions, therefore its discharge voltage is a kind of low-frequency oscillation decaying waveform.?
In the series loop of R/L/C composition, when meeting certain parameter condition, i.e. when R < 4L/C, discharge voltage such as Fig. 3 static capacity
Oscillation due to discharge form.
Discharge voltage and discharge current on C2:
1.2.2 voltage transformer excitation property
As shown in figure 4, its inductance shows as non-linear, L1, L2 are respectively iron core for the exciting characteristic curve of voltage transformer
Coil inductance when unsaturated state, saturation state.The L of zone of saturation is very big with respect to unsaturation regional change in excitation curve
(hundred times that general L1 is about L2).When C2 discharges, curent change trend such as Fig. 5 on L, the working cycles of VT are as follows: O → A → B
→A→O→C→D→C→O。
1.2.3 the voltage waveform of Ferroresonance Overvoltage Caused by PT
After GCB is disconnected, the upper induced voltage that can bear to be generated by power supply E of L, numerical value is EC1/ (C1+C2), with oscillation
Decaying waveform will be overlapped and compensate the oscillating voltage of decaying, if the induced voltage is sufficiently large and its phase is at a time proper
It is close with the low-frequency voltage phase of decaying, it is possible to increase the amplitude of low-frequency voltage and persistently exist, i.e., iron has occurred in VT
Magnetic resonance causes voltage transformer over-voltage.If power frequency is f0, then resonance frequency is generally f0/3, f0/5, f0/7 at this time, they
Corresponding equilibrium transport voltage peak respectively about distinguish by 375kV, 187kV, 125kV, conversion to voltage transformer secondary side voltage
About 68V, 34V, 23V, resonance primary side voltage waveform is as shown in Fig. 6, Fig. 7, Fig. 8.
Pass through practice analysis, it is determined that the establishment for the collection point main points that the application is directed to, it is more accurate, quick to guarantee
It was found that high voltage switchyard Ferroresonance Overvoltage Caused by PT phenomenon.And implement the high pressure GIS switchyard electricity of R & D design the application
Mutual inductor ferromagnetic resonance prior-warning device is pressed, the GIS spacer units device signal that ferromagnetic resonance may occur is acquired and in advance
It is alert.
A kind of prior-warning device of high pressure GIS switching point voltage mutual inductor ferromagnetic resonance, referring to Fig. 9, Figure 10, voltage transformer
Ferromagnetic resonance prior-warning device logic chart and Ferroresonance Overvoltage Caused by PT prior-warning device realize schematic diagram.Including voltage transformer iron
Magnetic resonance prior-warning device, the Ferroresonance Overvoltage Caused by PT prior-warning device are believed by breaker quartile signal acquisition module, voltage
Number acquisition module and ferromagnetic resonance pre-warning signal output module composition, the breaker quartile signal acquisition module is between each GIS
It is acquired every the circuit breaker position contact of unit, the voltage signal acquisition module is mutually electric to voltage transformer secondary side three-phase
Pressure is acquired, the breaker quartile signal acquisition module and voltage signal acquisition module respectively with ferromagnetic resonance pre-warning signal
Output module electrical connection.
Ferroresonance Overvoltage Caused by PT prior-warning device installation site is flexible, is mountable to high-tension switch gear room, relay is protected
It protects in room or monitoring room, installation site can be selected according to on-site actual situations, it acquires circuit breaker position signal and voltage is mutual
Sensor secondary side three-phase phase voltage, each signal that acquires use independent loop, guarantee the reliability of signal.
The breaker quartile signal acquisition module is to the breaker quartiles of each GIS spacer units, and to the interval GIS list
The breaker secondary side stable state phase voltage U φ of member is acquired.
The breaker quartile signal acquisition module further includes timer, and the timer is to pulling open GIS spacer units most
The time T and setting time Tset that the latter breaker starts timing are acquired.
The ferromagnetic resonance pre-warning signal output module carries out threshold value setting and carries out pre-warning signal transmission.
Monitoring system in the ferromagnetic resonance pre-warning signal output module and electric system communicates downlink connection, ferromagnetic resonance
Pre-warning signal output module send alarm signal to monitoring system switching value acquisition module by hardwire, to realize ferromagnetic humorous
Vibration warning function.
A kind of method for early warning of high pressure GIS switching point voltage mutual inductor ferromagnetic resonance, in the high voltage switchyard of electric system
Ferroresonance Overvoltage Caused by PT prior-warning device is installed, by the breaker secondary side for acquiring breaker quartile and GIS spacer units
Stable state phase voltage U φ starts timing T when pulling open the last one breaker of GIS spacer units, is exceeding setting time Tset
Afterwards, any one phase stable state phase voltage of Ferroresonance Overvoltage Caused by PT prior-warning device acquisition or stable state frequency dividing phase voltage are more than that its is right
The early warning definite value answered, then ferromagnetic resonance prior-warning device issues alarm signal and is transported to monitoring system, to carry out ferromagnetic resonance
Warning function.
Scaling down processing is carried out to the breaker secondary side stable state phase voltage U φ of GIS spacer units, calculate secondary side 1/3,
1/5,1/7 frequency dividing stable state phase voltage, uses U φ (f respectively0/3)、Uφ(f0/5)、Uφ(f0/ 7) it indicates, is pulling open the spacer units
Start timing when the last one breaker GCBn, if ferromagnetic resonance prior-warning device still be able to collect except setting time it is super
The stable state phase voltage or stable state frequency dividing phase voltage of definite value are crossed, then ferromagnetic resonance prior-warning device issues resonance pre-warning signal.
T indicates the time for starting timing when pulling open the spacer units the last one breaker GCBn, when Tset indicates adjusting
Between, U φ indicates secondary side stable state phase voltage, and U φ .set indicates secondary side stable state phase voltage definite value, U φ (f0/3)、Uφ(f0/
5)、Uφ(f0/ 7) indicate that calculated secondary side stable state divides phase voltage, U φ (f0/3).set、Uφ(f0/5).set、Uφ
(f0/ 7) .set indicates that secondary side stable state divides phase voltage definite value.
Preferably, the value of the setting time Tset is 0.2s-0.5s.The secondary side stable state frequency dividing phase voltage is fixed
Value U φ (f0/3).set、Uφ(f0/5).set、Uφ(f0/ 7) .set value is 4V-8V；The secondary side stable state phase voltage is fixed
The value of value U φ .set is the 1/3 of voltage transformer secondary side specified phase voltage.In this way, ferromagnetic resonance prior-warning device can hide
Unbalance voltage when standby operate normally is opened up, and can reliably collect the steady state voltage being spaced after breaker open operation, and have
Very high sensitivity.
Safe and practical property analysis:
Ferroresonance Overvoltage Caused by PT prior-warning device can above send pre-warning signal, remind when switching station equipment generation resonance
Operator pulls open resonance interval unit breaker by voltage transformer side disconnecting switch in time, destroys resonant parameter, keeps away
Exempt from resonance and cause equipment scaling loss, resonance is preferably minimized the harm of equipment.Especially in the case of switchyard accident treatment, operation
Personnel have found that the difficulty of resonance is bigger, which can solve this problem.
Security reliability analysis:
The circuit breaker position signal and voltage transformer secondary side three-phase of Ferroresonance Overvoltage Caused by PT prior-warning device acquisition
Phase voltage, each signal that acquires must use independent loop, guarantee the reliability of signal.Alarm signal is sent by hardwire to monitoring
System switching amount acquisition module, prevents electromagnetic interference.Ferroresonance Overvoltage Caused by PT prior-warning device is in spacer units inner breaker
Start timing after whole separating brakes, beyond after setting time Tset, any one phase stable state phase voltage or stable state frequency dividing phase voltage are more than
Its corresponding early warning definite value, prior-warning device can be sent in reliable export resonance alarm signal to monitoring system.
Above to a kind of high pressure GIS switching point voltage mutual inductor ferromagnetic resonance prior-warning device provided by the present invention and early warning
Method has carried out exhaustive presentation, and used herein a specific example illustrates the principle and implementation of the invention, with
The explanation of upper embodiment is merely used to help understand method and its core concept of the invention；Meanwhile for the general of this field
Technical staff, according to the thought of the present invention, there will be changes in the specific implementation manner and application range, to of the invention
Change and improvement will be possible, the conception and scopes without exceeding accessory claim defined, in conclusion this explanation
Book content should not be construed as limiting the invention.
Claims (10)
1. a kind of prior-warning device of high pressure GIS switching point voltage mutual inductor ferromagnetic resonance, it is characterised in that: including voltage transformer
Ferromagnetic resonance prior-warning device, the Ferroresonance Overvoltage Caused by PT prior-warning device is by breaker quartile signal acquisition module, voltage
Signal acquisition module and ferromagnetic resonance pre-warning signal output module composition, the breaker quartile signal acquisition module is to each GIS
The circuit breaker position contact of spacer units is acquired, and the voltage signal acquisition module is to voltage transformer secondary side three-phase phase
Voltage is acquired, and the breaker quartile signal acquisition module and voltage signal acquisition module are believed with ferromagnetic resonance early warning respectively
The electrical connection of number output module.
2. the prior-warning device of high pressure GIS switching point voltage mutual inductor ferromagnetic resonance according to claim 1, feature exist
In: the breaker quartile signal acquisition module to the breaker quartile of each GIS spacer units, and to GIS spacer units
Breaker secondary side stable state phase voltage U φ is acquired.
3. the prior-warning device of high pressure GIS switching point voltage mutual inductor ferromagnetic resonance according to claim 1, feature exist
In: the breaker quartile signal acquisition module further includes timer, the timer to pull open GIS spacer units the last one
The time T and setting time Tset that breaker starts timing are acquired.
4. according to claim 1 to high pressure GIS switching point voltage mutual inductor ferromagnetic resonance described in 3 any one claims
Prior-warning device, it is characterised in that: the ferromagnetic resonance pre-warning signal output module carries out threshold value setting and carries out pre-warning signal hair
It send.
5. the prior-warning device of high pressure GIS switching point voltage mutual inductor ferromagnetic resonance according to claim 4, feature exist
In: the monitoring system in the ferromagnetic resonance pre-warning signal output module and electric system communicates downlink connection.
6. a kind of method for early warning of high pressure GIS switching point voltage mutual inductor ferromagnetic resonance according to claim 1, feature
It is: Ferroresonance Overvoltage Caused by PT prior-warning device is installed in the high voltage switchyard of electric system, by acquiring breaker quartile
With the breaker secondary side stable state phase voltage U φ of GIS spacer units, when pulling open the last one breaker of GIS spacer units
Start timing T, after beyond setting time Tset, any one phase equilibrium transport of Ferroresonance Overvoltage Caused by PT prior-warning device acquisition
Voltage or stable state frequency dividing phase voltage are more than its corresponding early warning definite value, then ferromagnetic resonance prior-warning device issues alarm signal and conveys
To monitoring system, to carry out ferromagnetic resonance warning function.
7. a kind of method for early warning of high pressure GIS switching point voltage mutual inductor ferromagnetic resonance according to claim 1, feature
It is: scaling down processing is carried out to the breaker secondary side stable state phase voltage U φ of GIS spacer units, calculates secondary side 1/3,1/
5,1/7 frequency dividing stable state phase voltage, respectively U φ (f0/3)、Uφ(f0/5)、Uφ(f0/7)。
8. a kind of method for early warning of high pressure GIS switching point voltage mutual inductor ferromagnetic resonance according to claim 6, feature
Be: the value of the setting time Tset is 0.2s-0.5s.
9. a kind of method for early warning of high pressure GIS switching point voltage mutual inductor ferromagnetic resonance according to claim 6, feature
Be: the early warning definite value under setting time Tset is that secondary side stable state divides phase voltage definite value U φ (f0/3).set、Uφ(f0/
5).set、Uφ(f0/ 7) .set and secondary side stable state phase voltage definite value U φ .set.
10. a kind of method for early warning of high pressure GIS switching point voltage mutual inductor ferromagnetic resonance according to claim 9, special
Sign is: the secondary side stable state divides phase voltage definite value U φ (f0/3).set、Uφ(f0/5).set、Uφ(f0/ 7) .set takes
Value is 4V-8V；The value of the secondary side stable state phase voltage definite value U φ .set is voltage transformer secondary side specified phase voltage
1/3。
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| CN201811183692.2A CN109270449A (en) | 2018-10-11 | 2018-10-11 | The prior-warning device and method of high pressure GIS switching point voltage mutual inductor ferromagnetic resonance |
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| CN201811183692.2A CN109270449A (en) | 2018-10-11 | 2018-10-11 | The prior-warning device and method of high pressure GIS switching point voltage mutual inductor ferromagnetic resonance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111650546A (en) * | 2020-05-25 | 2020-09-11 | 武汉华瑞智深电气技术有限公司 | Online monitoring system and method for effectively preventing explosion of voltage transformer |
| CN113674973A (en) * | 2021-07-05 | 2021-11-19 | 中国长江电力股份有限公司 | Ferromagnetic resonance elimination circuit of GIS voltage transformer |
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| CN113674973A (en) * | 2021-07-05 | 2021-11-19 | 中国长江电力股份有限公司 | Ferromagnetic resonance elimination circuit of GIS voltage transformer |
| CN113674973B (en) * | 2021-07-05 | 2023-02-17 | 中国长江电力股份有限公司 | Ferromagnetic resonance elimination circuit of GIS voltage transformer |
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