CN104377649B - Transformer neutral point grounding switch automatic switching method - Google Patents
Transformer neutral point grounding switch automatic switching method Download PDFInfo
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- CN104377649B CN104377649B CN201410647852.XA CN201410647852A CN104377649B CN 104377649 B CN104377649 B CN 104377649B CN 201410647852 A CN201410647852 A CN 201410647852A CN 104377649 B CN104377649 B CN 104377649B
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Abstract
The invention discloses a kind of transformer neutral point grounding switch automatic switching method, the technical problem to be solved is to ensure that the neutral ground of transformer station's active system.The method of the present invention, for the actively powered system of X platform parallel operation of transformers, the position of high-voltage side bus network interconnecting circuit and medium voltage side section switch is conjunction position, the position of high voltage side of transformer and medium voltage side breaker is conjunction position, when 1 to X, 1 high voltage side of transformer and remaining high voltage side of transformer of medium voltage side neutral ground and medium voltage side isolated neutral, the grounding switch of close ungrounded high voltage side of transformer and medium voltage side neutral point.The present invention is compared with prior art, the breaker of neutral grounded transformer is because of fault trip or bus tripping, when causing system locally to lose neutral point, close the neutral ground disconnecting link of ungrounded transformer, ensure that the height of substation transformer, medium voltage side have neutral ground all the time, improve the security of Operation of Electric Systems.
Description
Technical field
The present invention relates to a kind of guard method of transformer station, particularly a kind of protection 220kV/110kV/35 (or 10) kV becomes
The method of power plant safety operation.
Background technology
For the transformer station of 110kV aboves, whether transformer neutral point is grounded, the number of grounding transformer,
Directly affect short circuit current size and its distribution of transformer station when there is earth fault, the dielectric level of power network, power system
Power supply reliability, security etc..In order to prevent overvoltage when there is singlephase earth fault in power system, many transformers
During paired running, it is necessary to ensure that at least one transformer neutral point ground connection.Therefore, to there are many changes of parallel operation of transformers
Power station, during to prevent neutral grounded transformer because of fault trip or bus tripping, active system loses neutral point, real
Row neutral ground disconnecting link is automatically controlled to have great importance.Prior art use method be：(1) when power transformation system of transformer station
After system breaks down, by the manually operated neutral ground disconnecting link of operations staff, not only personal safety cannot be ensured, manual closing operation
Time is long, and ageing, reliability cannot also be ensured.(2) when power system is broken down, operations staff's focus of attention is past
Toward in the investigation of failure, usually ignore the operation of neutral ground disconnecting link, if breaking down again, whole power transformation may be given
System brings more serious accident, results in greater loss.
The content of the invention
It is an object of the invention to provide a kind of transformer neutral point grounding switch automatic switching method, the technology to be solved is asked
Topic is to ensure that the neutral ground of transformer station's active system.
The present invention uses following technical scheme:A kind of transformer neutral point grounding switch automatic switching method, becomes for X platforms
The actively powered system of depressor paired running, X is at least two transformers, and high-voltage side bus network interconnecting circuit and medium voltage side are segmented
The position of breaker is closes position, and the position of high voltage side of transformer and medium voltage side breaker is conjunction position, when 1 to X-1 platform transformations
When device high-pressure side and remaining high voltage side of transformer of medium voltage side neutral ground and medium voltage side isolated neutral, ungrounded change of closing
The condition of the grounding switch of depressor high-pressure side and medium voltage side neutral point is：
Close whole high voltage side of transformer and medium voltage side neutral ground disconnecting link：1 to X-1 platforms high voltage side of transformer and middle pressure
Position is closed in the position of side neutral ground knife, and the high-pressure side of any transformer and the position of medium voltage side breaker are changed into point position or any
The position of high-voltage side bus network interconnecting circuit and medium voltage side section switch is changed into a point position, all high voltage side of transformer and medium voltage side
Neutral ground knife closes a floodgate；
Or close ungrounded high voltage side of transformer and medium voltage side neutral ground disconnecting link：Any high-voltage side bus contact open circuit
The position of device and medium voltage side section switch is changed into a point position, the neutral ground knife conjunction of ungrounded high voltage side of transformer and medium voltage side
Lock；
Or the grounding switch of close any ungrounded high voltage side of transformer and medium voltage side neutral point：All high-pressure sides are with
The high voltage side of transformer of side neutral ground and the position of medium voltage side breaker is pressed to be changed into a point position, any ungrounded transformer is high
The neutral ground knife of pressure side 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 invention, is filled using automatically switching
Put.
Before the grounding switch of close ungrounded high voltage side of transformer and medium voltage side neutral point of the invention, the dress that automatically switches is given
Charging is put, is to the condition that automatic switching control equipment charges：1) the hard pressing plate of input " automatically controlling ", 2) X platforms high voltage side of transformer and
The position of medium voltage side breaker is in closing position, 3) position of all high-voltage side bus network interconnecting circuits and medium voltage side section switch
Put and be in closing position, 4) position of 1 to X-1 platforms high voltage side of transformer and medium voltage side neutral ground knife closes position, or 1 to X-1 platforms
Transformer neutral point is grounded；Meet 1) -4) after condition, kept for 10 seconds, complete to be charged to automatic switching control equipment；" the automatic control
The hard pressing plate of system " is to be arranged on the switch outside automatic switching control equipment.
High voltage side of transformer of the 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 invention and medium voltage side breaker, using the same time-division, while the linkage closed
Structure.
The closing position of high voltage side of transformer of the invention and medium voltage side neutral ground disconnecting link, using the same time-division, while
The linkage structure of conjunction.
High voltage side of transformer of the invention and medium voltage side breaker point, the position closed, its neutral point earthing point, the position closed
Put breaker point, the position of conjunction not by other transformers, neutral ground knife point, the influence of the position closed.
The tripping operation of the trip position and medium voltage side section switch of high voltage side of transformer bus-tie circuit breaker of the invention
Position, using the same time-division, while the linkage structure for closing.
The present invention compared with prior art, is automatically controlled, in actively powered system to many transformer neutral point grounding switchs
System normal course of operation in, if the breaker of neutral grounded transformer is because of fault trip or bus tripping, cause be
When system part loses neutral point, the neutral ground disconnecting link of the ungrounded transformer that closes is automatically controlled, it is ensured that 220kV transformer stations become
The height of depressor, medium voltage side have neutral ground all the time, improve the security of Operation of Electric Systems, it is to avoid more serious accident
Occur.
Brief description of the drawings
Fig. 1 is 1 two connection diagrams of transformer of embodiment.
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 2 three connection diagrams of transformer of embodiment.
Fig. 5 is the recharge logic block diagram of embodiment 2.
Fig. 6 is that the transformer grounding two of embodiment 2 one is earth-free performs grounding switch switch logic block diagram.
Specific embodiment
The present invention is described in further detail with example below in conjunction with the accompanying drawings.The method of the present invention is directed to the three of transformer station
In Y/Y/ delta connection modes, 220kV high-pressure sides are double bus scheme mode to volume transformer, and 110kV medium voltage sides are double points of single busbar
The section mode of connection, low-pressure side 35kV or 10kV are single bus scheme mode, and high-pressure side and medium voltage side transformer need neutral point to connect
Ground.The method of the present invention uses following attachment structure, and makees following setting：
(1) every high voltage side of transformer is identical with the ground connection structure of medium voltage side neutral point.
(2) trip position of every high voltage side of transformer and medium voltage side breaker, is coupled, using parallel way by characterizing
Divide, the hard contact of conjunction state accesses automatic switching control equipment.The trip position of high voltage side of transformer and medium voltage side breaker is expressed as：
TWJ-*B, wherein " * B " represents certain transformer, such as：The trip position of m transformer breakers is expressed as TWJ-mB.Automatically cutting
In changing device, simultaneously in when dividing position, the trip position of transformer breaker is denoted as 1 for high-pressure side and medium voltage side breaker,
TWJ-*B=1；Simultaneously in when closing position, the trip position of transformer breaker is denoted as 0, TWJ-*B=0.
Parallel way couples for high-pressure side and medium voltage side breaker same time-division, while the linkage knot for closing in the method for the present invention
Structure, the parallel way draw bail for hereinafter occurring also illustrate that the same time-division, while close linkage structure.
(3) combined floodgate (ground connection) position of high voltage side of transformer and medium voltage side neutral ground disconnecting link (earthing, ground knife), adopts
Coupled with parallel way, automatic switching control equipment is accessed by the hard contact of sign point, conjunction state.High voltage side of transformer, medium voltage side
The closing position of neutral ground knife is expressed as：The closing position of the neutral ground knife of JDD-*B, such as m transformers is expressed as
JDD-mB.In automatic switching control equipment, high-pressure side and medium voltage side neutral ground knife are in when dividing position simultaneously, the combined floodgate of earthing
Location mark is 0, JDD-*B=0；Simultaneously in when closing position, the closing position of earthing is denoted as 1, JDD-*B=1.
(4) certain high voltage side of transformer and medium voltage side breaker point, the position closed, its neutral point earthing point, the position closed
Put breaker point, the position of conjunction not by other transformers, neutral ground knife point, the influence of the position closed.
(5) the trip position TWJ-ML1 and medium voltage side section switch of high-voltage side bus network interconnecting circuit (mother) ML (divide
Section) trip position TWJ-ML2 (trip position of the two abbreviation mother ML, is identified using same symbol in the record of this paper：
TWJ-ML), coupled using parallel way, automatic switching control equipment is accessed by the hard contact of sign point, conjunction state.Filled automatically switching
In putting, in when dividing position, trip position is denoted as 1, TWJ-ML=1 to mother ML (high-pressure side mother and medium voltage side are segmented)；Simultaneously
In when closing position, trip position is denoted as 0, TWJ-ML=0.
(6) " two become without ground cutter position input " is designated 1, when " three become without ground cutter position input " is designated 1, respectively
Represent in two transformers, three transformers, the combined floodgate of at least one high voltage side of transformer and medium voltage side neutral ground knife
Position, i.e. neutral ground are closed in position, but are not all of transformer neutral point and are all grounded.By that analogy, " X platforms become without ground cutter position
Input " is designated 1, represents in the X platform transformers of transformer station, meets 1 to X-1 platforms high voltage side of transformer and medium voltage side neutrality
The closing position of point earthing closes position.Input " X platforms become without the ground cutter position input " control word in automatic switching control equipment, just no longer
From the division position of automatic switching control equipment outside collection earthing.
(7) " automatically controlling " hard pressing plate is set, when " automatically controlling " hard pressing plate is accessed on automatic switching control equipment, represent from
Dynamic switching device puts into the pattern of the automatic switchover neutral ground knife 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, in the present inventive method
After carrying out logic judgment, the ungrounded transformer neutral point grounding switch that closes automatically is performed, so that the automatic neutrality by transformer station
Point earthing position is switched to the device of ungrounded transformer from grounding transformer." automatically controlling " hard pressing plate is cut automatically to be arranged on
Outside changing device, control puts into or exits the switch of automatic switchover mode in the present inventive method.
Embodiment 1, as shown in figure 1, for two actively powered systems (system) of transformer mB, nB, two transformers
Paired running, when system is normally run, mother ML positions are conjunction position TWJ-ML=0, wherein a transformer mB neutral point connects
Ground JDD-mB=1, another transformer nB isolated neutrals JDD-nB=0, two high voltage side of transformer are while be connected to double
On I mother 220kV of bus and II mother 220kV, medium voltage side, low-pressure side are connected to I mother 110kV/35kV, II mother 110kV/
On 35kV, the position of two high voltage side of transformer and medium voltage side breaker is conjunction position TWJ-mB=0, TWJ-nB=0.The present embodiment
The result to be realized is：Any high-pressure side of transformer and the position of medium voltage side breaker are changed into a point position, the position of any mother
It is changed into a point position, the neutral ground disconnecting link of the ungrounded transformer that closes, to ensure that actively powered system is not in without neutrality
The working environment of point ground connection.
In the present embodiment, transformer neutral point grounding switch automatic switching method is comprised the following steps：
First, automatic switching control equipment " charging " is given, as shown in Fig. 2 being to the logical condition of automatic switching control equipment " charging "：
(1) the hard pressing plate of input " automatically controlling ", " will automatically control " hard pressing plate and be linked on automatic switching control equipment, into automatic switchover
Property point earthing pattern, the position of (2) two high voltage side of transformer and medium voltage side breaker is in closing position, TWJ-mB=0,
TWJ-nB=0, (3) mother position is in closing position, TWJ-ML=0, and (4) " two become without ground cutter position input " are 1, or one
Transformer neutral point is grounded JDD-mB=1, another earth-free JDD-nB=0 of transformer neutral point (or JDD-mB=0, JDD-
NB=1).After meeting the condition of (1)-(4), kept for 10 seconds, complete to give automatic switching control equipment " charging ".To automatic switching control equipment
The purpose of " charging ", be in order to meet automatic switching control equipment can normal work, be perform the inventive method primary condition, if
Limitation without the condition, automatic switching control equipment may not enter normal operating conditions or send false command, perform and close non-
The operation of grounding transformer neutral ground disconnecting link, therefore, it is ungrounded transformation of subsequently closing to automatic switching control equipment " charging "
The material conditions of device neutral ground disconnecting link.
2nd, close ungrounded transformer neutral point grounding switch, as shown in figure 3, it is divided into two kinds of situations,
The first situation, the logical condition of whole transformer neutral point grounding switchs that close is：(1) " charging " completion, (2)
" two become without ground cutter position input " is 1, and (3) any high-pressure side of transformer and the position of medium voltage side breaker are changed into a point position,
It is changed into 1 from 0, or the position of any mother is changed into a point position, and 1 is changed into from 0.Meet the condition of (1)-(3), automatic switching control equipment sends
The order that all transformer neutral point earthings close a floodgate, drives whole transformer neutral point earthings to close a floodgate.
Second situation, the logical condition of the ungrounded transformer neutral point grounding switch that closes is：(1) " charging " completion,
(2) position of any mother is changed into a point position, and 1 is changed into from 0, or wherein one high voltage side of transformer and medium voltage side breaker position
It is changed into a point position, 1 is changed into from 0.Meet the condition of (1)-(2), automatic switching control equipment sends the neutral ground of ungrounded transformer
The order that knife closes a floodgate, drives ungrounded transformer neutral point earthing to close a floodgate.
When maintenance transformer, bus and/or single busbar is needed, hard pressing plate " will be automatically controlled " and automatically switched
Device disconnects, and exits automatic switching function pattern, ensures that active system has reliable neutral point to connect by operations staff is manually operated
Ground.
Embodiment 2, as shown in figure 4, the actively powered system of three transformers mB, nB, pB to double bus scheme, three
Parallel operation of transformers, when system is normally run, mother ML positions are conjunction position TWJ-ML=0, and one is connected on a bus
The position of transformer, two transformers of connection on another bus, three high voltage side of transformer and medium voltage side breaker is conjunction
Position, when 1-2 platforms transformer neutral point is grounded.The result to be realized of the present embodiment is：The high-pressure side of any transformer and medium voltage side
The position of breaker is changed into a point position, and the position of any mother is changed into a point position, the neutral ground knife of the ungrounded transformer that closes
Lock, to ensure that actively powered system is not in the working environment without neutral ground.
In the present embodiment, transformer neutral point grounding switch automatic switching method is comprised the following steps：
First, automatic switching control equipment " charging " is given, as shown in figure 5, being to the logical condition of automatic switching control equipment " charging "：
(1) position of the hard pressing plate of input " automatically controlling ", (2) three high voltage side of transformer and medium voltage side breaker is in closing position,
TWJ-mB=0, TWJ-nB=0, TWJ-pB=0, (3) mother position is in closes position, TWJ-ML=0, and (4) " three become without ground knife
Position input "=1, or transformer neutral point other two transformer neutral point of ground connection is earth-free (such as：JDD-mB=1,
JDD-nB=0, JDD-pB=0), or two transformer neutral points to be grounded an other transformer neutral points earth-free (such as：JDD-
MB=1, JDD-nB=1, JDD-pB=0).After meeting (1)-(4) condition, kept for 10 seconds, complete to be charged to automatic switching control equipment.
2nd, close ungrounded transformer neutral point grounding switch, when a transformer neutral point is grounded other two transformations
During device isolated neutral, it is grounded with mB transformer neutral points, is said as a example by nB transformers, pB transformer neutral points are earth-free
It is bright, JDD-mB=1, JDD-nB=0, JDD-pB=0, as shown in fig. 6, it is divided into three kinds of situations,
The first situation, the logical condition of whole transformer neutral point grounding switchs that close is：(1) " charging " completion, (2)
" three become without ground cutter position input " is 1, and (3) any high-pressure side of transformer and the position of medium voltage side breaker are changed into a point position,
It is changed into 1 from 0, or the position of any mother is changed into a point position, and 1 is changed into from 0.Meet the condition of (1)-(3), automatic switching control equipment sends
The order that all transformer neutral point earthings close a floodgate, drives whole transformer neutral point earthings to close a floodgate.
Second situation, the logical condition of the two ungrounded transformer neutral point grounding switchs that close is：(1) " charging " is complete
Into the position of (2) any mother is changed into a point position, and 1 is changed into from 0.Meet the condition of (1)-(2), automatic switching control equipment sends two
The order that the neutral ground knife of ungrounded transformer closes a floodgate, drives two ungrounded transformer neutral point earthings to close a floodgate.
The third situation, the logical condition of any ungrounded transformer neutral point grounding switch that close is：(1) " charging "
Complete, the high voltage side of transformer of (2) neutral ground and the position of medium voltage side breaker are changed into a point position, 1 is changed into from 0.Meet
(1) condition of-(2), automatic switching control equipment sends any neutral ground knife combined floodgate order of ungrounded transformer, drives and appoints
Anticipate ungrounded transformer neutral ground knife close a floodgate.
When two transformer neutral points other transformer neutral points of ground connection are earth-free, such 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 breaker are changed into a point position, from 0
It is changed into 1, or the position of any mother is changed into a point position, and 1 is changed into from 0, automatic switching control equipment is sent in the ungrounded transformer of neutral point
Property point earthing close a floodgate order, drive the neutral ground knife of ungrounded transformer to close a floodgate.
When maintenance transformer, bus and/or single busbar is needed, hard pressing plate " will be automatically controlled " and automatically switched
Device disconnects, and exits automatic switching function pattern, ensures that active system has reliable neutral point to connect by operations staff is manually operated
Ground.
In embodiment 1 and embodiment 2, the ISA-358GZ types using CYG Sunrui Co., Ltd. are automatic
Switching device, the attachment structure accessed by hard contact, obtain the position of each transformer breaker, neutral ground cutter position and
Dividing, closing information for mother position, using ansi standard c programming language, after execution logic judges, operates automatic switching control equipment operation
The combined floodgate contact of the operation circuit of plate, the order for performing and closing a floodgate is sent to neutral ground knife motor-operating mechanism, is such as implemented
In example 1,
After judging to meet the condition of (1)-(4), kept for 10 seconds, complete the record charged to automatic switching control equipment：Charged
Rec()。
The first situation judges to meet the condition of (1)-(3), sends the order that all transformer neutral point earthings close a floodgate：
Auto All Switch Close()。
For the actively powered system of X platform parallel operation of transformers, when system is normally run, in having 1 to an X-1 platform transformers
Property point ground connection, all mother positions are conjunction position, and the position of all high voltage side of transformer and medium voltage side breaker is conjunction position.This
The result to be realized of inventive method is：Any high-pressure side of transformer and the position of medium voltage side breaker are changed into a point position, any female
The position of connection is changed into a point position, the neutral ground knife of the ungrounded transformer that closes.X is that many transformers of at least two are arranged side by side
Operation.Transformer neutral point grounding switch automatic switching method of the invention, comprises the following steps：
First, automatic switching control equipment " charging " is given, the logical condition to automatic switching control equipment " charging " is：(1) input is " automatic
The position of the hard pressing plate of control ", (2) X platforms high voltage side of transformer and medium voltage side breaker is in closing position, (3) all mother positions
It is in closing position, (4) " X platforms become without ground cutter position input "=1, or 1 to X-1 platforms transformer neutral point ground connection.Meet (1)-(4)
After condition, kept for 10 seconds, complete to be charged to automatic switching control equipment.
2nd, close the grounding switch of ungrounded transformer neutral point, when 1 to X-1 platform transformer neutral points are grounded remaining change
During depressor isolated neutral, it is divided into three kinds of situations,
The first situation, the logical condition of whole transformer neutral point grounding switchs that close is：(1) " charging " completion, (2)
" X platforms become without ground cutter position input " is 1, and (3) any high-pressure side of transformer and the position of medium voltage side breaker are changed into a point position, from
0 is changed into 1, or the position of any mother is changed into a point position, and 1 is changed into from 0.Meet the condition of (1)-(3), automatic switching control equipment sends institute
There is the order that transformer neutral point earthing closes a floodgate, drive whole transformer neutral point earthings to close a floodgate.
Second situation, the logical condition of the ungrounded transformer neutral point grounding switch that closes is：(1) " charging " completion,
(2) position of any mother is changed into a point position, and 1 is changed into from 0.Meet the condition of (1)-(2), automatic switching control equipment sends ungrounded change
The order that the neutral ground knife of depressor closes a floodgate, drives ungrounded transformer neutral point earthing to close a floodgate.
Situation in 3rd, the logical condition of any grounding switch of ungrounded transformer neutral point that close is：(1) " fill
Electricity " is completed, and the high voltage side of transformer of (2) all neutral grounds and the position of medium voltage side breaker are changed into a point position, 1 is changed into from 0.
Meet the condition of (1)-(2), automatic switching control equipment sends any neutral ground knife combined floodgate order of ungrounded transformer, drives
The neutral ground knife of dynamic any ungrounded transformer closes a floodgate.
The method of the present invention, is in order to automatic switching control equipment enters using the purpose for first giving automatic switching control equipment " charging "
Implement the original state of the inventive method, to meet the prerequisite that ungrounded transformer neutral point earthing closes a floodgate, then certainly
Dynamic switching device sends combined floodgate order according to the logical condition of the grounding switch of the ungrounded transformer neutral point that closes, and closes non-
Grounding transformer neutral ground disconnecting link, it is ensured that it is neutral that the actively powered system run in 220kV transformer stations does not lose transformer
Point ground connection, improves the ageing and reliability of transformer neutral point earthing combined floodgate, it is to avoid transformer and system occur again
During failure, operations staff ignores the operation of neutral ground knife and brings more serious accident to whole system, causes bigger
Loss.In examination and repair system, the mode with operation maintenance personnel, it is ensured that independence, flexibility.
Claims (7)
1. a kind of transformer neutral point grounding switch automatic switching method, it is characterised in that：For X platform parallel operation of transformers
Actively powered system, X is at least two transformers, and the position of high-voltage side bus network interconnecting circuit and medium voltage side section switch is equal
For conjunction position, the position of high voltage side of transformer and medium voltage side breaker is conjunction position, when 1 to X-1 platforms high voltage side of transformer and middle pressure
When remaining high voltage side of transformer of side neutral ground and medium voltage side isolated neutral, close ungrounded high voltage side of transformer and in
The condition of grounding switch for pressing side neutral point is：
Close whole high voltage side of transformer and medium voltage side neutral ground disconnecting link：In 1 to X-1 platforms high voltage side of transformer and medium voltage side
Property point earthing position close position, the high-pressure side of any transformer and the position of medium voltage side breaker are changed into point position or any high pressure
The position of side bus network interconnecting circuit and medium voltage side section switch is changed into a point position, and all high voltage side of transformer and medium voltage side are neutral
Point earthing closes a floodgate；
Or close ungrounded high voltage side of transformer and medium voltage side neutral ground disconnecting link：Any high-voltage side bus network interconnecting circuit and
The position of medium voltage side section switch is changed into the neutral ground knife combined floodgate of a point position, ungrounded high voltage side of transformer and medium voltage side；
Or the grounding switch of close any ungrounded high voltage side of transformer and medium voltage side neutral point：All high-pressure sides and medium voltage side
The high voltage side of transformer of neutral ground and the position of medium voltage side breaker are changed into a point position, any ungrounded high voltage side of transformer
Neutral ground knife with medium voltage side closes a floodgate；
Before the grounding switch of close ungrounded high voltage side of transformer and the medium voltage side neutral point, charge to automatic switching control equipment,
It is to the condition that automatic switching control equipment charges：1) the hard pressing plate of input " automatically controlling ", 2) X platforms high voltage side of transformer and medium voltage side it is disconnected
The position of road device is in closing position, 3) position of all high-voltage side bus network interconnecting circuits and medium voltage side section switch is in
Close position, 4) during the position of 1 to X-1 platforms high voltage side of transformer and medium voltage side neutral ground knife closes position, or 1 to X-1 platform transformers
Property point ground connection；Meet 1) -4) after condition, kept for 10 seconds, complete to be charged to automatic switching control equipment；Described " automatically controlling " hard pressing plate
To be arranged on the switch outside automatic switching control equipment.
2. transformer neutral point grounding switch automatic switching method according to claim 1, it is characterised in that：It is described to close
The grounding switch of ungrounded high voltage side of transformer and medium voltage side neutral point, using automatic switching control equipment.
3. transformer neutral point grounding switch automatic switching method according to claim 1, it is characterised in that：The transformation
Device high-pressure side is identical with the ground connection structure of medium voltage side neutral point.
4. transformer neutral point grounding switch automatic switching method according to claim 1, it is characterised in that：The transformation
Device high-pressure side and the trip position of medium voltage side breaker, using the same time-division, while the linkage structure for closing.
5. transformer neutral point grounding switch automatic switching method according to claim 1, it is characterised in that：The transformation
Device high-pressure side and the closing position of medium voltage side neutral ground disconnecting link, using the same time-division, while the linkage structure for closing.
6. transformer neutral point grounding switch automatic switching method according to claim 1, it is characterised in that：The transformation
Device high-pressure side and medium voltage side breaker point, the position closed, its neutral point earthing point, the position closed are not broken by other transformers
Road device point, the position closed, neutral ground knife point, the influence of the position closed.
7. transformer neutral point grounding switch automatic switching method according to claim 1, it is characterised in that：The transformation
The trip position of device high-voltage side bus network interconnecting circuit and the trip position of medium voltage side section switch, using the same time-division, while
The linkage structure of conjunction.
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| CN201410647852.XA CN104377649B (en) | 2014-11-14 | 2014-11-14 | Transformer neutral point grounding switch automatic switching method |
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| CN201410647852.XA CN104377649B (en) | 2014-11-14 | 2014-11-14 | Transformer neutral point grounding switch automatic switching method |
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| CN112003239B (en) * | 2020-08-25 | 2023-04-25 | 广东电网有限责任公司 | Control method and device for neutral point grounding mode of transformer |
| CN112821446B (en) * | 2020-12-31 | 2023-02-10 | 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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| CN101237127A (en) * | 2007-01-30 | 2008-08-06 | 唐翊程 | Method for eliminating neutral grounding line parallel bug in transmission and distribution system |
| WO2010149217A1 (en) * | 2009-06-26 | 2010-12-29 | Abb Technology Ag | Method for protecting transformers, and a transformer |
| CN203895978U (en) * | 2014-05-22 | 2014-10-22 | 姜谷兵 | Neutral ground protection system used for medium-voltage power grid |
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2014
- 2014-11-14 CN CN201410647852.XA patent/CN104377649B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101237127A (en) * | 2007-01-30 | 2008-08-06 | 唐翊程 | Method for eliminating neutral grounding line parallel bug in transmission and distribution system |
| WO2010149217A1 (en) * | 2009-06-26 | 2010-12-29 | Abb Technology Ag | Method for protecting transformers, and a transformer |
| CN203895978U (en) * | 2014-05-22 | 2014-10-22 | 姜谷兵 | Neutral ground protection system used for medium-voltage power grid |
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