CN113674973A - Ferromagnetic resonance elimination circuit of GIS voltage transformer - Google Patents
Ferromagnetic resonance elimination circuit of GIS voltage transformer Download PDFInfo
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- CN113674973A CN113674973A CN202110757397.9A CN202110757397A CN113674973A CN 113674973 A CN113674973 A CN 113674973A CN 202110757397 A CN202110757397 A CN 202110757397A CN 113674973 A CN113674973 A CN 113674973A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/24—Voltage transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
A GIS voltage transformer ferromagnetic resonance elimination circuit comprises a breaker DL1 and a breaker DL2 which are connected with two sides of a connection point at one end of a voltage transformer PT1, two ends of the breaker DL1 are provided with isolating switches GW1 and GW2, two ends of the breaker DL2 are provided with isolating switches GW3 and GW4, two ends of the isolating switches GW1 and GW2, an auxiliary switch of the isolating switches GW3 and GW4 and an auxiliary switch of the breaker DL1 and DL2 form a resonance elimination control circuit, the resonance elimination control circuit enables a fast saturation resonance elimination coil to be connected into a secondary winding of the voltage transformer to prevent and eliminate ferromagnetic resonance when a related breaker of the GIS voltage transformer is in a hot standby state, the fast saturation resonance elimination coil and the secondary winding of the voltage transformer are disconnected after the related breaker connects a closing transformer into an electric power system, and the fast saturation resonance elimination coil is prevented from operating to avoid the adverse effect of the fast saturation resonance elimination coil of the secondary transformer on the safe and stable operation of GIS equipment, the normal use of the GIS can be avoided while resonance is avoided.
Description
Technical Field
The invention relates to the field of control of high-voltage electrical equipment, in particular to a ferromagnetic resonance elimination circuit of a GIS voltage transformer.
Background
GIS is gas insulated metal enclosed switchgear, belongs to high voltage transmission equipment field. The GIS takes SF6 gas as an insulating medium, has the advantages of compact structure, small occupied area, high reliability, no influence of external environmental conditions, small maintenance workload and the like, and is widely applied to power systems. For measurement and protection, GIS devices are generally designed with PTs. The inductance of PT often forms ferromagnetic resonance circuit with the voltage-sharing capacitance of GIS circuit breaker fracture, causes GIS PT overvoltage or overcurrent and damages. Therefore, gipt often requires installation of a device that eliminates ferroresonance.
The defects and shortcomings of the prior art are as follows:
high voltage and extra high voltage GIS are generally three-half or four-third connections as shown in fig. 1 (in the figure, 4-digit numbers are circuit breakers, 5-digit numbers are isolation switches, and 6-digit numbers are grounding switches). PT is often designed on the GIS incoming line, outgoing line and bus. Gipt in some cases, particularly when the isolation switches on both sides of the associated circuit breaker are closed (i.e., circuit breaker hot standby), tends to ferroresonate. For example, in fig. 1, if the isolation knife- switches 52211 and 52212 on both sides of the 5221 breaker or the isolation knife- switches 52221 and 52222 on both sides of the 5222 breaker are in a closed state, or if a total of 4 isolation knife-switches on both sides of the 5221 and 5222 breaker are in a closed state, a ferromagnetic resonance may occur in 13JYH PT. The method for eliminating PT ferromagnetic resonance is diversified, wherein one method is that a fast saturation coil is directly connected to a PT secondary side, when the PT is in ferromagnetic resonance, the fast saturation resonance elimination coil connected to a PT secondary winding is quickly saturated by higher voltage which is greater than rated voltage and is generated by the PT secondary side, the current of the secondary winding is immediately increased, the saturation of a PT iron core is inhibited, and the aim of eliminating the ferromagnetic resonance is fulfilled.
The disadvantage of directly connecting the fast saturated harmonic elimination coil to the PT secondary side winding is that when the power frequency overvoltage of the system occurs, the fast saturated harmonic elimination coil rapidly becomes smaller in saturation impedance, and the PT winding can be burnt out due to overlarge current. In order to ensure the safe and reliable operation of the GIS equipment, the power grid often limits the direct connection of the fast saturation harmonic elimination coil on the PT secondary side.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a ferromagnetic resonance elimination circuit of a GIS voltage transformer, which can effectively avoid the defects while ensuring that a fast saturation resonance elimination coil keeps the original function of eliminating PT ferromagnetic resonance.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a GIS voltage transformer ferromagnetic resonance elimination circuit comprises circuit breakers DL1 and DL2 connected with two sides of a connecting point at one end of a voltage transformer PT1, isolating switches GW1 and GW2 are arranged at the upper end and the lower end of a circuit breaker DL1, isolating switches GW3 and GW4 are arranged at the upper end and the lower end of a circuit breaker DL2, a resonance elimination control circuit is formed by the auxiliary switches of the isolating switches GW1 and GW2, the auxiliary switches of the isolating switches GW3 and GW4 and the auxiliary switches of the circuit breakers DL1 and DL2, the resonance elimination control circuit controls a fast saturation resonance elimination coil Ra in a secondary side connecting loop of the voltage transformer PT1 to be put into the circuit when the isolating switches are switched on, and the circuit breaker is withdrawn when the circuit is switched on.
The resonance elimination control circuit structure is as follows: the isolation switches GW1 and GW2 are provided with auxiliary switches GD1 and GD2, the isolation switches GW3 and GW4 are provided with auxiliary switches DG3 and GD4, the auxiliary switches GD1, GD2, GD3 and GD4 are normally open switches, the GD1 and GD2 are connected in series and then connected in parallel with a series branch formed by the GD3 and GD4, the parallel branch formed is connected in series with auxiliary normally closed travel switches of the circuit breakers DL1 and DL2 and a coil of the control contactor JQ to form a control series loop, and a control voltage U is applied to two ends of the whole control series loop.
In a preferable scheme, the disconnecting switch GW1 is linked with the GW2, the disconnecting switch GW3 is linked with the GW4, the disconnecting switches GW1 and GW2 are provided with a stroke change-over switch GD5, the disconnecting switches GW3 and GW4 are provided with a stroke change-over switch GD6, the stroke change-over switches GD5 and GD6 and auxiliary switches of the circuit breakers DL1 and DL2 form a resonance elimination control circuit, the resonance elimination control circuit controls the fast saturation resonance elimination coil Ra in the secondary side connection loop of the voltage transformer PT1 to be switched in when the disconnecting switch is switched on, and the circuit breaker is switched off when the circuit breaker is switched on.
In a preferred embodiment, the resonance elimination control circuit has the following structure: the travel conversion switches GD5 and GD6 are normally open switches, are connected in parallel and then are connected in series with auxiliary normally closed travel switches of the circuit breakers DL1 and DL2 and a coil of the control contactor JQ to form a control series circuit, and a control voltage U is applied to two ends of the whole control series circuit.
The secondary side connecting loop connecting structure of the voltage transformer PT1 is as follows: and a normally open contact of the control contactor JQ is connected with the fast saturation resonance elimination coil Ra in series, and then two ends of the normally open contact are connected with secondary side contacts A1a and A1n of a voltage transformer PT 1.
In the preferred scheme, an air switch KK is arranged in the harmonic elimination control circuit, the input end of the air switch KK is connected with a control voltage U, and the output end of the input end of the air switch KK is connected with two ends of a control series circuit.
In a preferable scheme, an auxiliary opening point of an air switch KK is arranged in a secondary side connecting loop of the voltage transformer PT 1.
In a preferable scheme, the normally open switches of the travel conversion switches GD5 and GD6 and the auxiliary normally closed switches of the circuit breakers DL1 and DL2 are respectively connected in series with indicator lamps H1, H2, H3 and H4 and then connected in parallel at two ends of a control series circuit to indicate states of the disconnecting switch and the circuit breaker, and signal lines are led out from intermediate points of the switches and the indicator lamps to a PLC or a local control unit.
In a preferable scheme, the voltage transformer PT1 is a three-phase voltage transformer, the three sets of resonance elimination control circuits respectively control the secondary side connection loops of the three sets of voltage transformers PT1, the voltage transformer PT1 is connected with the GIS, and the GIS is a three-phase common box type.
According to the GIS voltage transformer ferromagnetic resonance elimination circuit provided by the invention, when a GIS voltage transformer PT related breaker is in a hot standby state, the fast saturation resonance elimination coil is connected to the secondary side winding of the voltage transformer to prevent and eliminate ferromagnetic resonance, after the related breaker is switched on and the transformer is connected to a power system, the fast saturation resonance elimination coil and the secondary side winding of the voltage transformer are disconnected from operation, so that the adverse effect of the transformer secondary fast saturation resonance elimination coil on the safe and stable operation of GIS equipment is avoided, and the normal use of GIS can be avoided while resonance is avoided.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a partial wiring diagram of a GIS of the present invention;
FIG. 2 is a schematic connection diagram of the detuning control circuit;
fig. 3 is a schematic diagram of a secondary side connection loop of a voltage transformer PT 1;
FIG. 4 is a schematic diagram of the connection of a potential transformer PT1 in a GIS;
FIG. 5 is a schematic diagram of the connection of the detuning control circuit in the preferred embodiment;
FIG. 6 is a schematic diagram of the connection of a potential transformer PT1 in a GIS in the preferred scheme;
FIG. 7 is a schematic diagram of the connection of a preferred harmonic control circuit;
fig. 8 shows a secondary side connection loop of a three-phase common box type GIS voltage transformer.
Wherein: the automatic control system comprises a voltage transformer PT1, a breaker DL1, a breaker DL2, a disconnecting switch GW1, a disconnecting switch GW2, a disconnecting switch GW3, a disconnecting switch GW4, an auxiliary switch GD1, an auxiliary switch GD2, an auxiliary switch GD3, an auxiliary switch GD4, a travel change-over switch GD5, a travel change-over switch GD6, a control contactor JQ, a control voltage U, a fast saturation harmonic elimination coil Ra, an indicator lamp H1, an indicator lamp H2, an indicator lamp H3 and an indicator lamp H4.
Detailed Description
The technical scheme of the invention is explained in detail in the following by combining the drawings and the embodiment.
As shown in fig. 2-4, a GIS voltage transformer ferromagnetic resonance elimination circuit includes a breaker DL1 and a breaker DL2 connected to two sides of a connection point at one end of a voltage transformer PT1, disconnectors GW1 and GW2 are provided at upper and lower ends of the breaker DL1, disconnectors GW3 and GW4 are provided at upper and lower ends of the breaker DL2, disconnectors GW1 and GW2, auxiliary switches of disconnectors GW3 and GW4, and auxiliary switches of breakers DL1 and DL2 constitute a resonance elimination control circuit, and the resonance elimination control circuit controls a fast saturation resonance elimination coil Ra in a secondary side connection loop of the voltage transformer PT1 to be switched on when the disconnectors are switched on and to be switched off when the breakers are switched on.
As shown in fig. 2 and 4, disconnecting switches GW1 and GW2 are switched in and out, GW3 and GW4 are switched in and out, so that circuit breaker DL1 or DL2 enters or exits a hot standby state, and at the same time, whether circuit breaker DL1 or DL2 is in the hot standby state is represented by the off state of auxiliary switches GD1-GD4, which can be used to control whether fast saturation resonance elimination coil Ra is turned on.
The breaker DL1 and DL2 auxiliary switches are used to exit the fast saturation resonance elimination coil Ra when the breaker is closed.
The structure of the resonance elimination control circuit shown in fig. 2 is as follows: the isolation switches GW1 and GW2 are provided with auxiliary switches GD1 and GD2, the isolation switches GW3 and GW4 are provided with auxiliary switches DG3 and GD4, the auxiliary switches GD1, GD2, GD3 and GD4 are normally open switches, the GD1 and GD2 are connected in series and then connected in parallel with a series branch formed by GD3 and GD4, the formed parallel branch is connected in series with auxiliary normally closed travel switches of the circuit breakers DL1 and DL2 and coils of the control contactor JQ to form a control series circuit, a control voltage U is applied to two ends of the whole control series circuit, when the normally open auxiliary switches GD1 and GD2 are simultaneously switched on or the auxiliary switches GD3 and GD4 are simultaneously switched on, when the auxiliary switches of the circuit breakers DL1 and DL2 are both in a closed state, at least one circuit breaker is in a hot standby state, the control series circuit is switched on at the time, the control voltage U at two ends of the control series circuit is switched on to make the coils of the control contactor JQ switched on to get an electric coil, and control the saturated resonance elimination coil Ra, when any one auxiliary normally closed switch of the circuit breakers DL1 and DL2 is in an off state, the voltage transformer PT1 is connected to the power system, at the moment, the control series circuit is disconnected, the JQ coil of the contactor is powered off and disconnected, and the control speed saturation resonance elimination coil Ra is out of operation.
Preferably, as shown in fig. 5 and 6, the disconnecting switch GW1 is linked with GW2, the disconnecting switch GW3 is linked with GW4, the disconnecting switches GW1 and GW2 are provided with travel switches GD5, the disconnecting switches GW3 and GW4 are provided with travel switches GD6, the travel switches GD5 and GD6 and auxiliary switches of the circuit breakers DL1 and DL2 form a resonance elimination control circuit, the resonance elimination control circuit controls the fast saturation resonance elimination coil Ra in the secondary side connection loop of the voltage transformer PT1 to be switched on when the disconnecting switch is switched on, and the circuit breaker is switched off when the circuit breaker is switched on.
Preferably, as shown in fig. 5, the structure of the resonance elimination control circuit is as follows: the travel conversion switches GD5 and GD6 are normally open switches, are connected in parallel and then are connected in series with auxiliary normally closed travel switches of the circuit breakers DL1 and DL2 and a coil of the control contactor JQ to form a control series circuit, and a control voltage U is applied to two ends of the whole control series circuit.
As shown in fig. 5 and 6, the disconnecting switches GW1 and GW2 are linked, the disconnecting switches GW3 and GW4 are linked, the disconnecting switches GW1 and GW2 are provided with travel switches GD5, the disconnecting switches GW3 and GW4 are provided with travel switches GD6, the travel switches GD5 and GD6 and the auxiliary switches of the circuit breakers DL1 and DL2 form a resonance elimination control circuit, the resonance elimination control circuit controls the fast saturation resonance elimination coil Ra in the secondary side connection loop of the voltage transformer PT1 to be switched on when the disconnecting switch is switched on, and the circuit breaker is switched off when the circuit breaker is switched on.
As shown in fig. 5 and 6, isolation switches GW1 and GW2, GW3 and GW4 are linked, and simultaneously connected and disconnected, so that both are simultaneously connected and disconnected, so that breaker DL1 or DL2 enters or exits a hot standby state, and at the same time, whether breaker DL1 or DL2 is in the hot standby state is represented by the off state of travel switches GD5 and GD6, which may be used to control whether fast saturation resonance elimination coil Ra is turned on.
The breaker DL1 and DL2 auxiliary switches are used to exit the fast saturation resonance elimination coil Ra when the breaker is closed.
As shown in fig. 5, the structure of the resonance elimination control circuit is as follows: the travel conversion switches GD5 and GD6 are normally open switches, are connected in parallel and then are connected in series with auxiliary normally closed travel switches of the circuit breakers DL1 and DL2 and a coil of the control contactor JQ to form a control series loop, a control voltage U is applied to two ends of the whole control series circuit, when any one of normally-open travel conversion switches GD5 and GD6 is closed, auxiliary normally-closed switches of circuit breakers DL1 and DL2 are in a closed state, when at least one breaker is in a hot standby state, the control series circuit is switched on, the control voltage U at two ends of the control series circuit enables the JQ coil of the control contactor to be electrified and pulled in, the control speed saturation resonance elimination coil Ra is switched on to eliminate resonance, when an auxiliary normally closed switch of any one of the breakers DL1 and DL2 is in an off state, the voltage transformer PT1 is connected into the power system, the control series circuit is disconnected at the moment, the JQ coil of the contactor is disconnected after power failure, and the control speed saturation harmonic elimination coil Ra is out of operation.
As shown in fig. 3, the secondary side connection loop connection structure of the voltage transformer PT1 is as follows: the normally open contact of control contactor JQ is connected with fast saturation resonance elimination coil Ra series connection back both ends are connected with voltage transformer PT1 secondary side contact A1a and A1n, through the input or the withdraw from of the fast saturation resonance elimination coil Ra of normally open contact control contactor JQ.
In the preferred scheme, be equipped with air switch KK among the foretell harmonic elimination control circuit, air switch KK input connection control voltage U, air switch KK input output connection control series circuit's both ends can control whether whole harmonic elimination control function launches through air switch KK.
In a preferable scheme, an auxiliary opening point of an air switch KK is arranged in a secondary side connecting loop of the voltage transformer PT 1.
Preferably, as shown in fig. 7, the normally open switches of the travel switches GD5 and GD2 and the auxiliary normally closed switches of the breakers DL1 and DL2 are respectively connected in series with the indicator lamps H1, H2, H3 and H4 and then connected in parallel at two ends of the control series circuit for indicating the states of the disconnector and the breaker, a signal line is led out to a PLC or a local control unit at the middle point of each switch and indicator lamp, the indicator lamps H1, H2, H3 and H4 are installed on the device for harmonic elimination control, the states of the disconnector and the breaker can be directly observed, and compared with the state of the Ra coil of the rapidly saturated harmonic elimination coil, the reason for the Ra coil of the rapidly saturated harmonic elimination coil to be put in or taken out can be directly obtained.
Preferably, as shown in fig. 8, the above-mentioned voltage transformer PT1 is a three-phase voltage transformer, the three sets of resonance elimination control circuits respectively control the secondary side connection loops of the three sets of voltage transformer PT1, the voltage transformer PT1 is connected with the GIS, the GIS is a three-phase common box type, when the GIS is a three-phase common box type, the three-phase mechanism is disposed at one location, and whether the resonance elimination coil is put into operation can be respectively controlled by the three sets of control circuits.
The working principle of the invention is as follows:
when the disconnecting switches GW1 and GW2 on the upper side and the lower side of the breaker DL1 related to the voltage transformer PT1 are switched on or the disconnecting switches GW3 and GW4 on the upper side and the lower side of the breaker DL2 are switched on, the stroke change-over switch GD5 or GD6 in related action is switched on, the breaker between the two disconnecting switches switched on is in a hot standby state, at the moment, the normally closed contacts of the breaker DL1 and the breaker DL2 are closed under the non-closed state, so that the JQ coil of the contactor is electrified, the fast saturation resonance elimination coil Ra is switched on to eliminate ferromagnetic resonance, when the breaker DL1 or DL2 is closed, the voltage transformer PT1 is switched into the power system, the corresponding normally closed stroke switch is switched off, the JQ coil of the contactor is deenergized, and the fast saturation resonance elimination coil Ra is withdrawn.
Claims (9)
1. A GIS voltage transformer eliminates ferromagnetic resonance circuit, including breaker DL1 and DL2 connected with one end connection point both sides of voltage transformer PT1, breaker DL1 upper and lower both ends are equipped with disconnecting switch GW1 and GW2, breaker DL2 upper and lower both ends are equipped with disconnecting switch GW3 and GW4, characterized by that, disconnecting switch GW1 and GW2, the auxiliary switch of disconnecting switch GW3 and GW4 and the auxiliary switch of breaker DL1 and DL2 make up the harmonic elimination control circuit, harmonic elimination control circuit control voltage transformer 1 secondary side in the fast saturation harmonic elimination coil Ra in the connecting circuit put into when disconnecting switch closes, the circuit breaker withdraws from when closing.
2. The control circuit for eliminating ferroresonance of the GIS voltage transformer according to claim 1, wherein the structure of the control circuit for eliminating ferroresonance is as follows: the isolation switches GW1 and GW2 are provided with auxiliary switches GD1 and GD2, the isolation switches GW3 and GW4 are provided with auxiliary switches DG3 and GD4, the auxiliary switches GD1, GD2, GD3 and GD4 are normally open switches, the GD1 and GD2 are connected in series and then connected in parallel with a series branch formed by the GD3 and GD4, the parallel branch formed is connected in series with auxiliary normally closed travel switches of the circuit breakers DL1 and DL2 and a coil of the control contactor JQ to form a control series loop, and a control voltage U is applied to two ends of the whole control series loop.
3. The control circuit for eliminating the ferromagnetic resonance of the GIS voltage transformer according to claim 1, wherein the isolating switches GW1 and GW2 are linked, the isolating switches GW3 and GW4 are linked, the isolating switches GW1 and GW2 are provided with travel switches GD5, the isolating switches GW3 and GW4 are provided with travel switches GD6, the travel switches GD5 and GD6 and the auxiliary switches of the circuit breakers DL1 and DL2 form a resonance elimination control circuit, and the resonance elimination control circuit controls a fast saturation resonance elimination coil Ra in a secondary side connecting loop of the voltage transformer PT1 to be switched on when the isolating switches are switched on and to be switched off when the circuit breakers are switched on.
4. The control circuit for eliminating ferroresonance of the GIS voltage transformer according to claim 3, wherein the structure of the control circuit for eliminating ferroresonance is as follows: the travel conversion switches GD5 and GD6 are normally open switches, are connected in parallel and then are connected in series with auxiliary normally closed travel switches of the circuit breakers DL1 and DL2 and a coil of the control contactor JQ to form a control series circuit, and a control voltage U is applied to two ends of the whole control series circuit.
5. The circuit for eliminating ferroresonance of a GIS voltage transformer as claimed in any one of claims 2 or 4, wherein the secondary side connection loop connection structure of the voltage transformer PT1 is: and a normally open contact of the control contactor JQ is connected with the fast saturation resonance elimination coil Ra in series, and then two ends of the normally open contact are connected with secondary side contacts A1a and A1n of a voltage transformer PT 1.
6. The control circuit for eliminating the ferromagnetic resonance of the GIS voltage transformer according to claim 5, wherein an air switch KK is arranged in the control circuit, the input end of the air switch KK is connected with a control voltage U, and the output end of the input end of the air switch KK is connected with two ends of a control series circuit.
7. The control circuit for eliminating ferroresonance of a GIS voltage transformer as claimed in claim 5, wherein an auxiliary open point of an air switch KK is provided in a secondary side connection loop of the voltage transformer PT 1.
8. The control circuit for eliminating ferroresonance of a GIS voltage transformer as claimed in claim 4, wherein the normally open switches of the stroke transfer switches GD5 and GD6 and the auxiliary normally closed switches of the circuit breakers DL1 and DL2 are respectively connected in series with indicator lamps H1, H2, H3 and H4 and then connected in parallel with two ends of the control series circuit for indicating the states of the isolating switch and the circuit breaker, and signal lines are led out from the middle points of the switches and the indicator lamps to a PLC or a local control unit.
9. The control circuit for eliminating ferroresonance of a GIS voltage transformer according to claim 5, wherein the voltage transformer PT1 is a three-phase voltage transformer, the three sets of harmonic elimination control circuits respectively control the secondary side connection loops of the three sets of voltage transformers PT1, the voltage transformer PT1 is connected with the GIS, and the GIS is a three-phase common box type.
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| CN202110757397.9A CN113674973B (en) | 2021-07-05 | 2021-07-05 | Ferromagnetic resonance elimination circuit of GIS voltage transformer |
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| CN202110757397.9A CN113674973B (en) | 2021-07-05 | 2021-07-05 | Ferromagnetic resonance elimination circuit of GIS voltage transformer |
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| CN113674973B (en) | 2023-02-17 |
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