CN104377649A - Automatic switching method of transformer neutral grounding knife-switch - Google Patents

Automatic switching method of transformer neutral grounding knife-switch Download PDF

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CN104377649A
CN104377649A CN201410647852.XA CN201410647852A CN104377649A CN 104377649 A CN104377649 A CN 104377649A CN 201410647852 A CN201410647852 A CN 201410647852A CN 104377649 A CN104377649 A CN 104377649A
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voltage side
transformer
neutral
medium voltage
automatic switching
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CN104377649B (en
Inventor
李本瑜
徐成斌
许永军
辜新宇
刘宏君
李蔚凡
叶志锋
张凯
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YUNNAN ELECTRIC POWER DISPATCH CONTROL CENTER
CYG Sunri Co Ltd
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YUNNAN ELECTRIC POWER DISPATCH CONTROL CENTER
CYG Sunri Co Ltd
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Abstract

The invention discloses an automatic switching method of a transformer neutral grounding knife-switch to achieve the technical purpose of ensuring neutral grounding of a transformer active system. According to the method, as for the active power supply system in which X transformers run in parallel, a high-voltage side bus network interconnecting circuit breaker and a medium-voltage side section breaker are located at the switched-on positions, the transformer high-voltage side and a medium-voltage breaker are located at the switched-on positions, and when neutral points of the high-voltage sides and medium-voltage sides of one to X-1 transformers are connected to the ground but other neutral points of the high-voltage sides and the medium-voltage sides of the transformers are not connected to the ground, an earthing knife-switch of the neutral points of the high-voltage sides and the medium-voltage sides of the non-grounding transformers is switched on. Compared with the prior art, when part of the system loses the neutral points due to the fact that breakers of neutral point grounding transformers are disconnected because of fault tripping or buscouple breaker tripping, the neutral grounding knife-switch of the non-grounding transformers is switched on, it is ensured that the high-voltages sides and the medium-voltage sides of the transformers of a transformer substation have neutral points connected to the ground all the time, and the safety of electric power system operation is improved.

Description

Transformer neutral point grounding switch automatic switching method
Technical field
The present invention relates to a kind of guard method of transformer station, the method for particularly a kind of protection 220kV/110kV/35 (or 10) kV substation safety operation.
Background technology
For the transformer station of 110kV above, the number of transformer neutral point whether ground connection, grounding transformer, directly affect short circuit current size and the distribution thereof of transformer station when there is earth fault, the insulation level of electrical network, the power supply reliability, fail safe etc. of electric power system.In order to prevent overvoltage when there is single phase ground fault in electric power system, during multiple stage parallel operation of transformers, at least one transformer neutral point ground connection must be guaranteed.Therefore, to the transformer station that there is multiple stage parallel operation of transformers, during for preventing neutral grounded transformer because of fault trip or bus tripping, active system loses neutral point, carries out neutral ground disconnecting link and automatically controls to have great importance.The method that prior art adopts is: (1) is after transformer station's transformer substation system breaks down, by operations staff's manual operation neutral ground disconnecting link, not only personal safety can not get ensureing, the manual closing operation time is long, and ageing, reliability also can not get ensureing.(2), when electric power system is broken down, the focus that operations staff pays close attention to, often in the investigation of fault, usually ignore the operation of neutral ground disconnecting link, if again break down, bring more serious accident may to whole transformer substation system, result in greater loss.
Summary of the invention
The object of this invention is to provide a kind of transformer neutral point grounding switch automatic switching method, the technical problem that solve guarantees the neutral ground of transformer station's active system.
The present invention is by the following technical solutions: a kind of transformer neutral point grounding switch automatic switching method, source power supply system is had for X platform parallel operation of transformers, X is at least two transformers, the position of high-voltage side bus network interconnecting circuit and medium voltage side section breaker is co-bit, the position of high voltage side of transformer and medium voltage side circuit breaker is co-bit, when 1 to X-1 platform high voltage side of transformer and all the other high voltage side of transformers of medium voltage side neutral ground and medium voltage side isolated neutral, the condition of the grounding switch of close ungrounded high voltage side of transformer and medium voltage side neutral point is:
Close whole high voltage side of transformer and medium voltage side neutral ground disconnecting link: the position co-bit of 1 to X-1 platform high voltage side of transformer and medium voltage side neutral ground cutter, the position that the high-pressure side of any transformer and the position of medium voltage side circuit breaker become point position or any high-voltage side bus network interconnecting circuit and medium voltage side section breaker becomes a point position, and all high voltage side of transformers and medium voltage side neutral ground cutter close a floodgate;
Or close ungrounded high voltage side of transformer and medium voltage side neutral ground disconnecting link: the position of high-voltage side bus network interconnecting circuit and medium voltage side section breaker becomes a point position arbitrarily, and the neutral ground cutter of ungrounded high voltage side of transformer and medium voltage side closes a floodgate;
Or the grounding switch of close arbitrary ungrounded high voltage side of transformer and medium voltage side neutral point: the high voltage side of transformer of all high-pressure sides and medium voltage side neutral ground and the position of medium voltage side circuit breaker become a point position, and the neutral ground cutter of arbitrary ungrounded high voltage side of transformer and medium voltage side closes a floodgate.
The grounding switch of close ungrounded high voltage side of transformer and medium voltage side neutral point of the present invention, adopts automatic switching control equipment.
Before the grounding switch of close ungrounded high voltage side of transformer and medium voltage side neutral point of the present invention, charge to automatic switching control equipment, to the condition of automatic switching control equipment charging be: 1) drop into " automatically controlling " hard pressing plate, 2) position of X platform high voltage side of transformer and medium voltage side circuit breaker is all in co-bit, 3) position of all high-voltage side bus network interconnecting circuits and medium voltage side section breaker is all in co-bit, 4) the position co-bit of 1 to X-1 platform high voltage side of transformer and medium voltage side neutral ground cutter, or 1 to X-1 platform transformer neutral point ground connection; Satisfied 1) ,-4) after condition, keep 10 seconds, complete and charge to automatic switching control equipment; Described " automatically controlling " hard pressing plate is the switch being arranged on automatic switching control equipment outside.
High voltage side of transformer of the present invention is identical with the ground connection structure of medium voltage side neutral point.
The trip position of high voltage side of transformer of the present invention and medium voltage side circuit breaker, the linkage structure adopt the same time-division, simultaneously closing.
The closing position of high voltage side of transformer of the present invention and medium voltage side neutral ground disconnecting link, the linkage structure adopt the same time-division, simultaneously closing.
The position that high voltage side of transformer of the present invention and medium voltage side circuit breaker divide, close, the position that its neutral point earthing divides, the circuit breaker of position not by other transformers that close divides, closes, neutral ground cutter divides, the impact of position of closing.
The trip position of high voltage side of transformer bus-tie circuit breaker of the present invention and the trip position of medium voltage side section breaker, the linkage structure adopt the same time-division, simultaneously closing.
The present invention compared with prior art, multiple stage transformer neutral point grounding switch is controlled automatically, having in source power supply system normal course of operation, if the circuit breaker of neutral grounded transformer is because of fault trip or bus tripping, when causing system local to lose neutral point, automatic control is closed the neutral ground disconnecting link of ungrounded transformer, guarantee that height, the medium voltage side of 220kV substation transformer have neutral ground all the time, improve the fail safe of power system operation, avoid more serious accident to occur.
Accompanying drawing explanation
Fig. 1 is the connection diagram of embodiment 1 two transformers.
Fig. 2 is the recharge logic block diagram of embodiment 1.
Fig. 3 is that embodiment 1 performs grounding switch switch logic block diagram.
Fig. 4 is the connection diagram of embodiment 2 three transformers.
Fig. 5 is the recharge logic block diagram of embodiment 2.
Fig. 6 is the earth-free execution grounding switch switch logic block diagrams of embodiment 2 one transformer groundings two.
Embodiment
Below in conjunction with accompanying drawing and example, the present invention is described in further detail.Method of the present invention for the three-circuit transformer of transformer station in Y/Y/ delta connection mode, 220kV high-pressure side is double bus scheme mode, 110kV medium voltage side is the two section wiring mode of single busbar connection, low-pressure side 35kV or 10kV is single bus scheme mode, and high-pressure side and medium voltage side transformer need neutral ground.Method of the present invention adopts following syndeton, and does following setting:
(1) every platform high voltage side of transformer is identical with the ground connection structure of medium voltage side neutral point.
(2) trip position of every platform high voltage side of transformer and medium voltage side circuit breaker, adopts parallel way to connect, and divides, closes the hard contact of state to access automatic switching control equipment by characterizing.The trip position of high voltage side of transformer and medium voltage side circuit breaker is expressed as: TWJ-*B, and wherein " * B " represents certain transformer, as: the trip position of m transformer breaker is expressed as TWJ-mB.In automatic switching control equipment, when high-pressure side and medium voltage side circuit breaker are in point position simultaneously, the trip position of transformer breaker is denoted as 1, TWJ-*B=1; When being in co-bit, the trip position of transformer breaker is denoted as 0, TWJ-*B=0 simultaneously.
In method of the present invention, parallel way connects for high-pressure side and medium voltage side circuit breaker same time-division, the linkage structure that closes simultaneously, the linkage structure that the parallel way draw bail hereinafter occurred also represents the same time-division, closes simultaneously.
(3) combined floodgate (ground connection) position of high voltage side of transformer and medium voltage side neutral ground disconnecting link (earthing, ground cutter), adopts parallel way to connect, and divides, closes the hard contact of state to access automatic switching control equipment by characterizing.The closing position of the neutral ground cutter of high voltage side of transformer, medium voltage side is expressed as: JDD-*B, and the closing position as the neutral ground cutter of m transformer is expressed as JDD-mB.In automatic switching control equipment, when high-pressure side and medium voltage side neutral ground cutter are in point position simultaneously, the closing position of earthing is denoted as 0, JDD-*B=0; When being in co-bit, the closing position of earthing is denoted as 1, JDD-*B=1 simultaneously.
(4) certain high voltage side of transformer and the medium voltage side circuit breaker position dividing, close, the position that its neutral point earthing divides, the circuit breaker of position not by other transformers that close divides, closes, neutral ground cutter divides, the impact of position of closing.
(5) the trip position TWJ-ML1 of high-voltage side bus network interconnecting circuit (mother) ML and the trip position TWJ-ML2 of medium voltage side section breaker (segmentation) (is called for short the trip position of mother ML both in record herein, employing prosign identifies: TWJ-ML), employing parallel way connects, and divides, closes the hard contact of state to access automatic switching control equipment by characterizing.In automatic switching control equipment, when mother ML (high-pressure side mother and medium voltage side segmentation) is in point position, trip position is denoted as 1, TWJ-ML=1; When being in co-bit, trip position is denoted as 0, TWJ-ML=0 simultaneously.
(6) " two become without ground cutter position input " is designated 1, when " three become without ground cutter position input " is designated 1, be illustrated respectively in two transformers, three transformers, the closing position co-bit of at least one high voltage side of transformer and medium voltage side neutral ground cutter, i.e. neutral ground, but be not whole transformer neutral point all ground connection.By that analogy, " X platform become drop into without ground cutter position " is designated 1, represents in the X platform transformer of transformer station, meet 1 closing position co-bit to X-1 platform high voltage side of transformer and medium voltage side neutral ground cutter.In automatic switching control equipment, drop into " X platform becomes without ground cutter position input " control word, just no longer gather deciliter position of earthing from automatic switching control equipment outside.
(7) " automatically controlling " hard pressing plate is set, when automatic switching control equipment accesses " automatically controlling " hard pressing plate, represents that automatic switching control equipment drops into the pattern of the automatic switchover neutral ground cutter of the inventive method.Automatic switching control equipment is receiving transformer high-pressure side and medium voltage side circuit breaker trip position, mother trip position and earthing closing position information, after carrying out Logic judgment by method of the present invention, perform the ungrounded transformer neutral point grounding switch that automatically closes, thus automatically the neutral ground position of transformer station is switched to the device of ungrounded transformer from grounding transformer." automatically controlling " hard pressing plate for being arranged on automatic switching control equipment outside, controlling drop into by method of the present invention or exit the switch of automatic switchover mode.
Embodiment 1, as shown in Figure 1, for two transformer mB, nB has source power supply system (system), two parallel operation of transformers, when system is normally run, mother ML position is co-bit TWJ-ML=0, a wherein transformer mB neutral ground JDD-mB=1, another transformer nB isolated neutral JDD-nB=0, on I female 220kV that two high voltage side of transformers are connected to double-bus simultaneously and II female 220kV, medium voltage side, low-pressure side is connected to I female 110kV/35kV, on II female 110kV/35kV, the position of two high voltage side of transformers and medium voltage side circuit breaker is co-bit TWJ-mB=0, TWJ-nB=0.The result that the present embodiment will realize is: the high-pressure side of transformer and the position of medium voltage side circuit breaker become a point position arbitrarily, the position of any mother becomes a point position, close the neutral ground disconnecting link of ungrounded transformer, there will not be operational environment without neutral ground to guarantee to have source power supply system.
In the present embodiment, transformer neutral point grounding switch automatic switching method, comprises the following steps:
One, to automatic switching control equipment " charging ", as shown in Figure 2, to the logical condition of automatic switching control equipment " charging " be: (1) input " controls " hard pressing plate automatically, " automatically will control " hard pressing plate is linked on automatic switching control equipment, enter the pattern of automatic switchover neutral ground cutter, the position of (2) two high voltage side of transformers and medium voltage side circuit breaker is all in co-bit, TWJ-mB=0, TWJ-nB=0, (3) mother position is all in co-bit, TWJ-ML=0, (4) " two become without ground cutter position input " is 1, or a transformer neutral point ground connection JDD-mB=1, the earth-free JDD-nB=0 of another transformer neutral point (or JDD-mB=0, JDD-nB=1).After meeting the condition of (1)-(4), keep 10 seconds, complete to automatic switching control equipment " charging ".To the object of automatic switching control equipment " charging ", can normally work to meet automatic switching control equipment, it is the initial condition performing the inventive method, if the not restriction of this condition, automatic switching control equipment may can not enter normal operating conditions or send false command, performing the operation of closing ungrounded transformer neutral point grounding switch, therefore, is the material conditions of the follow-up ungrounded transformer neutral point grounding switch that closes to automatic switching control equipment " charging ".
Two, close ungrounded transformer neutral point grounding switch, as shown in Figure 3, is divided into two kinds of situations,
The first situation, the logical condition of whole transformer neutral point grounding switch of closing is: (1) " charging " completes, (2) " two become without ground cutter position input " is 1, (3) high-pressure side of transformer and the position of medium voltage side circuit breaker become a point position arbitrarily, 1 is become from 0, or the position of any mother becomes a point position, becomes 1 from 0.Meet the condition of (1)-(3), automatic switching control equipment sends the order that all transformer neutral point earthings close a floodgate, and drives whole transformer neutral point earthing to close a floodgate.
The second situation, the logical condition of ungrounded transformer neutral point grounding switch of closing is: (1) " charging " completes, (2) position of mother becomes a point position arbitrarily, 1 is become from 0, or the position of wherein a high voltage side of transformer and medium voltage side circuit breaker becomes a point position, becomes 1 from 0.Meet the condition of (1)-(2), the order that the neutral ground cutter that automatic switching control equipment sends ungrounded transformer closes a floodgate, drive ungrounded transformer neutral point earthing to close a floodgate.
When needs maintenance transformer, bus and/or single busbar connection, " automatically will control " pressing plate and automatic switching control equipment firmly and disconnect, exit automatic switching function pattern, ensuring origin system by operations staff's manual operation has reliable neutral ground.
Embodiment 2, as shown in Figure 4, source power supply system is had to three transformers mB, nB, pB of double bus scheme, three parallel operation of transformers, when system is normally run, mother ML position is co-bit TWJ-ML=0, article one, bus connects a transformer, another bus connects two transformers, and the position of three high voltage side of transformers and medium voltage side circuit breaker is co-bit, during 1-2 platform transformer neutral point ground connection.The result that the present embodiment will realize is: the high-pressure side of transformer and the position of medium voltage side circuit breaker become a point position arbitrarily, the position of any mother becomes a point position, close the neutral ground disconnecting link of ungrounded transformer, there will not be operational environment without neutral ground to guarantee to have source power supply system.
In the present embodiment, transformer neutral point grounding switch automatic switching method, comprises the following steps:
One, to automatic switching control equipment " charging ", as shown in Figure 5, to the logical condition of automatic switching control equipment " charging " be: (1) input " controls " hard pressing plate automatically, the position of (2) three high voltage side of transformers and medium voltage side circuit breaker is all in co-bit, TWJ-mB=0, TWJ-nB=0, TWJ-pB=0, (3) mother position is in co-bit, TWJ-ML=0, (4) " three become without ground cutter position input "=1, or other two the earth-free (as: JDD-mB=1 of transformer neutral point of transformer neutral point ground connection, JDD-nB=0, JDD-pB=0), or two other earth-free (as: JDD-mB=1 of transformer neutral point of transformer neutral point ground connection, JDD-nB=1, JDD-pB=0).After meeting (1)-(4) condition, keep 10 seconds, complete and charge to automatic switching control equipment.
Two, close ungrounded transformer neutral point grounding switch, when other two transformer neutral points of transformer neutral point ground connection are earth-free, with mB transformer neutral point ground connection, nB transformer, pB transformer neutral point are earth-free to be described for example, JDD-mB=1, JDD-nB=0, JDD-pB=0, as shown in Figure 6, three kinds of situations are divided into
The first situation, the logical condition of whole transformer neutral point grounding switch of closing is: (1) " charging " completes, (2) " three become without ground cutter position input " is 1, (3) high-pressure side of transformer and the position of medium voltage side circuit breaker become a point position arbitrarily, 1 is become from 0, or the position of any mother becomes a point position, becomes 1 from 0.Meet the condition of (1)-(3), automatic switching control equipment sends the order that all transformer neutral point earthings close a floodgate, and drives whole transformer neutral point earthing to close a floodgate.
The second situation, the logical condition of two the ungrounded transformer neutral point grounding switchs that close is: (1) " charging " completes, and the position of (2) any mother becomes a point position, becomes 1 from 0.Meet the condition of (1)-(2), the order that the neutral ground cutter that automatic switching control equipment sends two ungrounded transformers closes a floodgate, drive two ungrounded transformer neutral point earthings to close a floodgate.
The third situation, the logical condition of arbitrary ungrounded transformer neutral point grounding switch of closing is: (1) " charging " completes, (2) high voltage side of transformer of neutral ground and the position of medium voltage side circuit breaker become a point position, become 1 from 0.Meet the condition of (1)-(2), automatic switching control equipment sends the neutral ground cutter combined floodgate order of arbitrary ungrounded transformer, drives the neutral ground cutter of any ungrounded transformer to close a floodgate.
When two other transformer neutral points of transformer neutral point ground connection are earth-free, as: JDD-mB=1, JDD-nB=1, JDD-pB=0, the high voltage side of transformer of any neutral ground and the position of medium voltage side circuit breaker become a point position, become 1 from 0, or the position of any mother becomes a point position, become 1 from 0, automatic switching control equipment sends the order of neutral point ungrounded transformer neutral point earthing combined floodgate, drives the neutral ground cutter of ungrounded transformer to close a floodgate.
When needs maintenance transformer, bus and/or single busbar connection, " automatically will control " pressing plate and automatic switching control equipment firmly and disconnect, exit automatic switching function pattern, ensuring origin system by operations staff's manual operation has reliable neutral ground.
In embodiment 1 and embodiment 2, adopt the ISA-358GZ type automatic switching control equipment of CYG Sunrui Co., Ltd., by the syndeton that hard contact accesses, obtain the position of each transformer breaker, neutral ground cutter position and mother position point, conjunction information, adopt ansi standard c programming language, after actuating logic judges, the combined floodgate contact of the operation circuit of operation automatic switching control equipment operation plate, the order performing and close a floodgate is sent to neutral ground cutter motor-operating mechanism, as in embodiment 1
After judging the condition of satisfied (1)-(4), keep 10 seconds, complete to the record of automatic switching control equipment charging: Charged Rec ().
The first situation judges the condition meeting (1)-(3), sends the order that all transformer neutral point earthings close a floodgate: Auto All Switch Close ().
Have source power supply system for X platform parallel operation of transformers, when system is normally run, have 1 to X-1 platform transformer neutral point ground connection, all mother positions are co-bit, and the position of all high voltage side of transformers and medium voltage side circuit breaker is co-bit.The result that the inventive method will realize is: the high-pressure side of transformer and the position of medium voltage side circuit breaker become a point position arbitrarily, and the position of any mother becomes a point position, the neutral ground cutter of the ungrounded transformer that closes.X is the multiple stage parallel operation of transformers of at least two.Transformer neutral point grounding switch automatic switching method of the present invention, comprises the following steps:
One, to automatic switching control equipment " charging ", to the logical condition of automatic switching control equipment " charging " be: (1) input " controls " hard pressing plate automatically, (2) position of X platform high voltage side of transformer and medium voltage side circuit breaker is all in co-bit, (3) all mother positions are all in co-bit, (4) " X platform becomes without ground cutter position input "=1, or 1 to X-1 platform transformer neutral point ground connection.After meeting (1)-(4) condition, keep 10 seconds, complete and charge to automatic switching control equipment.
Two, close the grounding switch of ungrounded transformer neutral point, when all the other transformer neutral points of 1 to X-1 platform transformer neutral point ground connection are earth-free, is divided into three kinds of situations,
The first situation, the logical condition of whole transformer neutral point grounding switch of closing is: (1) " charging " completes, (2) " X platform becomes without ground cutter position input " is 1, (3) high-pressure side of transformer and the position of medium voltage side circuit breaker become a point position arbitrarily, 1 is become from 0, or the position of any mother becomes a point position, becomes 1 from 0.Meet the condition of (1)-(3), automatic switching control equipment sends the order that all transformer neutral point earthings close a floodgate, and drives whole transformer neutral point earthing to close a floodgate.
The second situation, the logical condition of the ungrounded transformer neutral point grounding switch that closes is: (1) " charging " completes, and the position of (2) any mother becomes a point position, becomes 1 from 0.Meet the condition of (1)-(2), the order that the neutral ground cutter that automatic switching control equipment sends ungrounded transformer closes a floodgate, drive ungrounded transformer neutral point earthing to close a floodgate.
Situation in 3rd, the logical condition of grounding switch of arbitrary ungrounded transformer neutral point of closing is: (1) " charging " completes, (2) high voltage side of transformer of all neutral ground and the position of medium voltage side circuit breaker become a point position, become 1 from 0.Meet the condition of (1)-(2), automatic switching control equipment sends the neutral ground cutter combined floodgate order of arbitrary ungrounded transformer, drives the neutral ground cutter of any ungrounded transformer to close a floodgate.
Method of the present invention, adopt first to the object of automatic switching control equipment " charging ", in order to automatic switching control equipment enters the initial condition implementing the inventive method, to meet the prerequisite that ungrounded transformer neutral point earthing closes a floodgate, then automatic switching control equipment is according to the logical condition of the grounding switch of the ungrounded transformer neutral point that closes, send order of closing a floodgate, close ungrounded transformer neutral point grounding switch, guarantee that the source power supply system that has run in 220kV transformer station does not lose transformer neutral point ground connection, improve the ageing and reliability that transformer neutral point earthing closes a floodgate, when avoiding transformer and system again to break down, operations staff ignores the operation of neutral ground cutter and brings more serious accident to whole system, result in greater loss.When examination and repair system, the mode coordinated by operation maintenance personnel, ensure that independence, flexibility.

Claims (8)

1. a transformer neutral point grounding switch automatic switching method, it is characterized in that: have source power supply system for X platform parallel operation of transformers, X is at least two transformers, the position of high-voltage side bus network interconnecting circuit and medium voltage side section breaker is co-bit, the position of high voltage side of transformer and medium voltage side circuit breaker is co-bit, when 1 to X-1 platform high voltage side of transformer and all the other high voltage side of transformers of medium voltage side neutral ground and medium voltage side isolated neutral, the condition of the grounding switch of close ungrounded high voltage side of transformer and medium voltage side neutral point is:
Close whole high voltage side of transformer and medium voltage side neutral ground disconnecting link: the position co-bit of 1 to X-1 platform high voltage side of transformer and medium voltage side neutral ground cutter, the position that the high-pressure side of any transformer and the position of medium voltage side circuit breaker become point position or any high-voltage side bus network interconnecting circuit and medium voltage side section breaker becomes a point position, and all high voltage side of transformers and medium voltage side neutral ground cutter close a floodgate;
Or close ungrounded high voltage side of transformer and medium voltage side neutral ground disconnecting link: the position of high-voltage side bus network interconnecting circuit and medium voltage side section breaker becomes a point position arbitrarily, and the neutral ground cutter of ungrounded high voltage side of transformer and medium voltage side closes a floodgate;
Or the grounding switch of close arbitrary ungrounded high voltage side of transformer and medium voltage side neutral point: the high voltage side of transformer of all high-pressure sides and medium voltage side neutral ground and the position of medium voltage side circuit breaker become a point position, and the neutral ground cutter of arbitrary ungrounded high voltage side of transformer and medium voltage side closes a floodgate.
2. transformer neutral point grounding switch automatic switching method according to claim 1, is characterized in that: described in close the grounding switch of ungrounded high voltage side of transformer and medium voltage side neutral point, adopt automatic switching control equipment.
3. transformer neutral point grounding switch automatic switching method according to claim 1, it is characterized in that: described in close ungrounded high voltage side of transformer and medium voltage side neutral point grounding switch before, charge to automatic switching control equipment, to the condition of automatic switching control equipment charging be: 1) drop into " automatically controlling " hard pressing plate, 2) position of X platform high voltage side of transformer and medium voltage side circuit breaker is all in co-bit, 3) position of all high-voltage side bus network interconnecting circuits and medium voltage side section breaker is all in co-bit, 4) the position co-bit of 1 to X-1 platform high voltage side of transformer and medium voltage side neutral ground cutter, or 1 to X-1 platform transformer neutral point ground connection, satisfied 1) ,-4) after condition, keep 10 seconds, complete and charge to automatic switching control equipment, described " automatically controlling " hard pressing plate is the switch being arranged on automatic switching control equipment outside.
4. transformer neutral point grounding switch automatic switching method according to claim 1, is characterized in that: described high voltage side of transformer is identical with the ground connection structure of medium voltage side neutral point.
5. transformer neutral point grounding switch automatic switching method according to claim 1, is characterized in that: the trip position of described high voltage side of transformer and medium voltage side circuit breaker, the linkage structure adopt the same time-division, simultaneously closing.
6. transformer neutral point grounding switch automatic switching method according to claim 1, is characterized in that: the closing position of described high voltage side of transformer and medium voltage side neutral ground disconnecting link, the linkage structure adopt the same time-division, simultaneously closing.
7. transformer neutral point grounding switch automatic switching method according to claim 1, it is characterized in that: the position that described high voltage side of transformer and medium voltage side circuit breaker divide, close, the position that the circuit breaker of position not by other transformers that its neutral point earthing divides, close divides, closes, neutral ground cutter divides, the impact of position of closing.
8. transformer neutral point grounding switch automatic switching method according to claim 1, it is characterized in that: the trip position of described high voltage side of transformer bus-tie circuit breaker and the trip position of medium voltage side section breaker, the linkage structure adopt the same time-division, simultaneously closing.
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CN112003239A (en) * 2020-08-25 2020-11-27 广东电网有限责任公司 Control method and device for transformer neutral point grounding mode
CN112821446A (en) * 2020-12-31 2021-05-18 广东电网有限责任公司 Control method and device for neutral grounding knife of main transformer

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