CN206023197U - A kind of differential protective system - Google Patents
A kind of differential protective system Download PDFInfo
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- CN206023197U CN206023197U CN201621090107.0U CN201621090107U CN206023197U CN 206023197 U CN206023197 U CN 206023197U CN 201621090107 U CN201621090107 U CN 201621090107U CN 206023197 U CN206023197 U CN 206023197U
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Abstract
This utility model embodiment discloses a kind of differential protective system, for protecting the various phase faults occurred inside double winding or three-winding transformer winding and its on lead-out wire, while may also be used for protecting the single-phase shorted-turn fault of transformator.This utility model embodiment provides a kind of differential protective system, including：Transformer differential protection system and line differential protection system, can reduce the quantity of line protective devices, while keeping outer bridging line operating structure constant, it is to avoid the phenomenon appearance that high voltage side of transformer failure cuts power circuit and bridge chopper by mistake occur.
Description
Technical field
This utility model is related to network transformer current protection field, more particularly to a kind of differential protective system.
Background technology
In electrical network, power transmission between transformer station, is carried out, usually there are many uncertain factors to make grid collapses, this
When transformer differential protection just have an effect, isolated fault point prevents failure from spreading.The differential protection of transformator is transformator
Main protection, is installed by circulating current principle.It is mainly used to protect inside double winding or three-winding transformer winding and its draw
The various phase faults occurred in outlet, while may also be used for protecting the single-phase shorted-turn fault of transformator.
In the relaying configuration scheme of the outer bridging line form transformer stations of traditional 220kV, 220kV circuits configure three ends of double sets
Fibre-optic current differential protection, transformator configure double set double-ended current differential protections.Enter line side, line differential protection in transformator
With the current loop of transformer differential protection in bridge breaker interval and high voltage side of transformer cross-over configuration, it is to avoid dead band occurs.
When line fault, line differential protection action, the chopper of difference tripping transformer output lines, bridge chopper and transformator
High-pressure side chopper；When inside transformer transformer fault, transformer differential protection action, tripping high voltage side of transformer and low
Pressure side chopper, failure are removed.
But, in traditional differential protective system, protect with transformer differential in high voltage side of transformer line differential protection
During shield intersection region failure, line differential protection and the equal action of transformer differential protection, and line differential protection can false tripping hold change
The chopper of depressor outlet line and bridge chopper.And the line configuring of the outer bridging line form of tradition is that three-terminal line is differential
Protection, complete set three-terminal line differential protective system need to configure 3 three-terminal line differential protections, in large-scale power grid
In, often have many transformer stations, line protective devices configuration quantity is more, it is desirable to which optical-fibre channel quantity is also more, this to designing,
Construction and operation maintenance bring the increase of workload.Therefore, protection of the line differential protection in bridging line transformer station is reduced
The protection domain is transferred to other protections of this transformer station being responsible for by scope, while keeping outer bridging line operating structure constant
Under conditions of, the chopper and bridge chopper wrong diagnosis that prevent transformer output lines are our technical problems to be solved.
Utility model content
This utility model embodiment provides a kind of differential protective system, can reduce the quantity of line protective devices, while
Keep outer bridging line operating structure constant, it is to avoid the phenomenon that high voltage side of transformer failure cuts power circuit and bridge chopper by mistake occur
Occur.
This utility model embodiment provides a kind of differential protective system, including：First line differential protection, the second line
Road differential protection and a differential protective device of transformer,
One end of the first line differential protection connects the second line differential protection device, and the other end connects
The outlet line of transformator；
One end of the second line differential protection device connects the first line differential protection, and the other end connects
The inlet wire side line road of transformator
The first end of the differential protective device of transformer connects the inlet wire side line road of the transformator, the second end cross structure
Chopper circuit, the low-pressure side circuit of transformator described in three-terminal link；
The circuit connection of the second line differential protection device and the differential protective device of transformer is in the transformation
Device inlet wire side line road cross-over configuration.
On a circuit-line, two wire connecting line roads of device form circuit loop.The circuit of described device is returned
There is overlapped part on road on the circuit-line for connecting jointly, is considered as cross-over configuration.
Preferably,
The transformator enters the current transformer that line side is mounted with to use for differential protection.
Preferably,
4th end of the differential protective device of transformer connects the high-pressure side circuit of the transformator, for further thin
Divide the scope of differential protective device of transformer.
Preferably,
The line differential protection device and the differential protective device of transformer are by current transformer and the line
Road connects, for detecting curent change.
Preferably,
The first line differential protection, the second line differential protection device and a differential protective device of transformer
Remote jump defencive function is respectively provided with, when an error occurs, can the corresponding chopper of rapid tripping with this function.
Preferably,
The first line differential protection and the second line differential protection device are fibre current differential protection device.
Preferably,
The differential protective device of transformer is current differential protection device.
Preferably,
The differential protective device of transformer is three-terminal differential protection device or four end differential protections, for connecting line
Three current transformers or four current transformers or five end differential protections on road.
Preferably,
The transformation implement body is arranged inside transformer station.
Preferably,
The transformator is specially three-phase transformer.
This utility model embodiment provides a kind of multiple transformers differential protective system, above-mentioned including two sets or more than two sets
Differential protective system, and at least two transformators；
Described at least two, between transformator, the mode of bridging line in addition connects；
Two sets or two sets of the above differential protective systems intersect on the bridge chopper circuit of the outer bridging line mode
Configuration.
As can be seen from the above technical solutions, this utility model embodiment has advantages below：
This utility model embodiment can reduce the quantity of line protective devices, while keeping outer bridging line operating structure not
Become, it is to avoid the phenomenon appearance that high voltage side of transformer failure cuts power circuit and bridge chopper by mistake occur.Also, the difference by transformator
Dynamic protection zone is segmented, and tripping is different to break transformer differential protection is automatically selected according to different fault zones
Fault incidence can be limited in Minimum Area by road device.
Description of the drawings
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or accompanying drawing to be used is briefly described needed for description of the prior art, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, before creative labor is not paid
Put, can be with according to these other accompanying drawings of accompanying drawings acquisition.
Fig. 1 is the differential protective system schematic diagram using three end differential protective device of transformer；
Remote jump protection wiring schematic diagrams of the Fig. 2 for differential protective system；
Fig. 3 is the differential protective system schematic diagram using four end differential protective device of transformer；
Fig. 4 is outer bridging line schematic diagram.
Wherein, reference is as described below：
1. line differential protection device；2. differential protective device of transformer (in 220kV transformer stations C)；3. transformator；4. electric
Current transformer.
Specific embodiment
This utility model embodiment discloses a kind of differential protective system, for protect double winding or three-winding transformer around
The various phase faults occurred on group inside and its lead-out wire, while may also be used for protecting the single-phase turn-to-turn short circuit of transformator
Failure.
For enabling utility model purpose of the present utility model, feature, advantage more obvious and understandable, below will knot
The accompanying drawing in this utility model embodiment is closed, the technical scheme in this utility model embodiment is clearly and completely described,
Obviously, the embodiments described below are only a part of embodiment of this utility model, and not all embodiment.It is based on this reality
With the embodiment in new, it is all other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of this utility model protection.
The thinking of this project alternative is to reduce the protection domain in the 220kV transformer stations C of line differential protection, that is, reduce
The protection domain is transferred to other protections of this transformer station being responsible for, i.e., by transformation by the protection domain in bridging line transformer station
The differential protection of device is being responsible for, that is, expands the protection domain of transformer differential protection in bridging line transformer station, while keeping
Outer bridging line operating structure is constant, to reach the quantity for reducing line protective devices 1, avoid the occurrence of high voltage side of transformer failure mistake
The phenomenon for cutting power circuit and bridge chopper occurs.
Embodiment 1
This utility model embodiment provides a kind of differential protective system, including：First line differential protection 1, second
Line differential protection device 1 and a differential protective device of transformer,
One end of first line differential protection 1 connects the second line differential protection device 1, other end connection transformer
Outlet line；
One end of second line differential protection device 1 connects first line differential protection 1, other end connection transformer
Inlet wire side line road
The inlet wire side line road of the first end connection transformer of differential protective device of transformer, the second end cross structure chopper line
Road, the low-pressure side circuit of three-terminal link transformator；
The circuit connection of the second line differential protection device 1 and differential protective device of transformer is on transformator inlet wire side line road
Cross-over configuration.
This utility model embodiment provides a kind of differential protection implementation method, based on above-mentioned differential protective system, including：
Differential protective system detects the position of trouble point；
Chopper of the differential protective system according to the position tripping trouble point both sides of trouble point.
As seen from Figure 1, using existing differential protective device of transformer, when there are D1 point area faults, circuit
Differential action, the corresponding chopper DL-A of the route protection tripping of transformer station A sides；The route protection difference tripping of transformer station C sides becomes
Depressor high-pressure side chopper 1DL and bridge chopper 3DL, failure are isolated.
After circuit D2 regions point failure as shown in Figure 1, Line Differential action, the route protection tripping of transformer station A sides
Corresponding chopper DL-A；Transformer station C sides route protection difference tripping high voltage side of transformer chopper 1DL and bridge chopper 3DL,
Failure is isolated.Simultaneously D2 point failures are also in the protection domain of transformer differential protection, transformer differential protection action, a side
High voltage side of transformer chopper 1DL, step down side chopper and bridge chopper 3DL in the difference tripping transformer station C of face, another
Aspect, transformer differential protection start the remote jump of 220kV line protective devices 1 in our station by a certain outlet junctions to external connection
Trip signal is reached corresponding line protective devices 1 in the transformer station A of circuit offside by optical fiber circuit, by this by function
The corresponding chopper of device tripping offside transformer station, failure are isolated.It can be seen that D2 point failures are disconnected by tripping 1DL and 3DL
Road device realizes that Fault Isolation is correct.
Circuit D4 point failures as shown in Fig. 1, trouble point will not actions outside the protection domain of Line Differential.But
In the protection domain of transformer differential protection, on the one hand transformer differential protection action distinguishes tripping transformer station C to D4 point failures
Interior high voltage side of transformer chopper 1DL, step down side chopper and bridge chopper 3DL, on the other hand, transformer differential is protected
The remote jump function of starting 220kV line protective devices 1 in our station by a certain outlet junctions to external connection is protected, by optical fiber circuit
Trip signal is reached corresponding line protective devices 1 in the transformer station A of circuit offside, by the device tripping offside transformer station
Corresponding chopper, failure are isolated.As can be seen that trouble point D4 is located at high voltage side of transformer chopper and step down side
Between chopper, if transformer differential protection tripping high voltage side of transformer chopper and low-pressure side chopper just can by failure every
From, it is clear that existing transformer differential protection has cut bridge chopper and the corresponding choppers of higher level transformer station A by mistake, causes accident model
Enclose expansion, it is necessary to which research is suitable for outer bridging line differential protective device of transformer.
Equally, the circuit D5 point failures as shown in Fig. 1, trouble point will not outside also being located at the protection domain of Line Differential
Action.But D5 point failures also in the protection domain of transformer differential protection, also cut bridge and broken by existing transformer differential protection by mistake
Road device and the corresponding choppers of higher level transformer station A, cause accident expanded range, it is necessary to which research is suitable for outer bridging line transformer differential
Protection device.
Line differential protection device 1 and differential protective device of transformer are by current transformer and connection.
First line differential protection 1, the second line differential protection device 1 and a differential protective device of transformer are equal
There is remote jump defencive function.
The remote jump protection wiring of differential protective system is as shown in Fig. 2 our station is in circuit current transformer (CT) and chopper
Between when breaking down, trouble point by its quick acting and cuts off the institute being connected with the bus in bus protection actuating range
There is chopper, but for offside transformer station, now failure is still present, and trouble point is not in the main protection of route protection
In actuating range, it is impossible to quickly cut off failure, it is desirable to which the back-up protection section of offside circuit cuts off failure through time delay, this will affect electricity
The stable operation of Force system.In order to realize quickly cutting off failure, be provided with remote jump work, i.e., dynamic in bus protection and failure protection
After work, start the TJR exit relays of this side breaker operation cabinet, the relay tip starts this side line line protection device 1
Remote jump function, offside route protection receive this remote jump order after, can after contact criterion the tripping line-breaker, realize failure
Quick excision.When above failure and other failures, if protection act cannot this interval of tripping chopper when, jump work(by remote
Can also tripping offside chopper, realize Fault Isolation.
First line differential protection 1 and the second line differential protection device 1 are fibre current differential protection device.
In the widely used middle high-pressure electrical network of optical fiber, route protection meets following configuration requirement mostly：
220kV route protection A：Configuration fibre-optic current differential protection；
220kV route protection B：Configuration fibre-optic current differential protection, or longitudinal distance protection；
110kV route protections：Configuration fibre-optic current differential protection.
Above protection device is respectively provided with trip protection signal distant place transmitting function.
Differential protective device of transformer is current differential protection device.
Differential protective device of transformer is three-terminal differential protection device or four end differential protections or five end differential protections
Device.
Transformation implement body is arranged inside transformer station.
Transformator is specially three-phase transformer.
Embodiment 2
This utility model embodiment provides a kind of differential protective system, including：First line differential protection 1, second
Line differential protection device 1 and a differential protective device of transformer,
One end of first line differential protection 1 connects the second line differential protection device 1, other end connection transformer
Outlet line；
One end of second line differential protection device 1 connects first line differential protection 1, other end connection transformer
Inlet wire side line road
The inlet wire side line road of the first end connection transformer of differential protective device of transformer, the second end cross structure chopper line
Road, the low-pressure side circuit of three-terminal link transformator；
The circuit connection of the second line differential protection device 1 and differential protective device of transformer is on transformator inlet wire side line road
Cross-over configuration；
The high-pressure side circuit of the 4th end connection transformer of differential protective device of transformer.
As seen from Figure 3, the outer bridging line differential protective device of transformer after improvement, has accessed transformer high-voltage and has surveyed electricity
Original transformer differential protection scope is divided into different differential protection zones by stream, can carry out respectively judging by different regions,
It is respectively started corresponding tripping operation exit relay, the corresponding chopper of tripping.
This utility model embodiment provides a kind of differential protection implementation method, based on above-mentioned differential protective system, including：
Differential protective system detects the position of trouble point；
Chopper of the differential protective system according to the position tripping trouble point both sides of trouble point.
Specifically,
Fig. 3 is analyzed, the circuit D1 point failures as shown in Fig. 3, Line Differential action, the circuit of transformer station A sides
The corresponding chopper DL-A of protection tripping；Transformer station C sides route protection difference tripping high voltage side of transformer chopper 1DL and bridge are disconnected
Road device 3DL, failure are isolated.
Circuit D2 point failures as shown in Fig. 3, Line Differential action, the route protection tripping of transformer station A sides are corresponding
Chopper DL-A；Transformer station C sides route protection difference tripping high voltage side of transformer chopper 1DL and bridge chopper 3DL, failure quilt
Isolation.Simultaneously D2 point failures are also in the range of the protection zone A of transformer differential protection, transformer differential protection action, and one
High voltage side of transformer chopper 1DL and bridge chopper 3DL in aspect difference tripping transformer station C, on the other hand, transformer differential is protected
The remote jump function of starting 220kV line protective devices 1 in our station by a certain outlet junctions to external connection is protected, by optical fiber circuit
Trip signal is reached corresponding line protective devices 1 in the transformer station A of circuit offside, by the device tripping offside transformer station
Corresponding chopper (note：Prior art, refers to Fig. 1,2 wiring), failure is isolated.Note：In above-mentioned course of action, transformator is poor
Dynamic protection can select tripping step down side chopper, can also select not tripping step down side chopper.
Circuit D3 point failures as shown in Fig. 3, as trouble point is not in the range of line differential protection, therefore Line Differential
Protect action of being failure to actuate.As D3 point failures are also in the range of the protection zone A of transformer differential protection, transformer differential is protected
Shield action, on the one hand high voltage side of transformer chopper 1DL and bridge chopper 3DL in difference tripping transformer station C, on the other hand, becomes
Depressor differential protection starts the remote jump function of 220kV line protective devices 1 in our station by a certain outlet junctions to external connection, leads to
Cross optical fiber circuit and trip signal is reached corresponding line protective devices 1 in the transformer station A of circuit offside, by the device tripping
The corresponding chopper of offside transformer station (note：Prior art, refers to Fig. 1,2 wiring, separately due to being outer bridging line, transformer station's C inlet wires
Side is without chopper, it is therefore necessary to could be by Fault Isolation by the chopper in tripping transformer station A), failure is isolated.Note：On
State in course of action, transformer differential protection can select tripping step down side chopper, can also select not jump.
Circuit D4 and D5 point failure as shown in Fig. 3, trouble point will not be moved outside the protection domain of Line Differential
Make.But D4 point failures are in the protection domain of transformer differential protection, and in the protection zone B of transformer differential protection,
Transformer differential protection action, respectively tripping high voltage side of transformer chopper 1DL and step down side chopper, failure by every
From.As can be seen that trouble point D4 and D5 are located between high voltage side of transformer chopper and step down side chopper, this programme
As long as transformer differential protection tripping high voltage side of transformer chopper and low-pressure side chopper just can be by Fault Isolation, it is clear that
This differential protective device of transformer has subregion judgement, and starts different tripping operation outlet electromechanics by fault zone, cuts
Different choppers is removed, and different isolation strategies is adopted by trouble point, hence it is evident that better than existing transformer differential protection, will not cut by mistake
Bridge chopper and the corresponding choppers of higher level transformer station A, will not make accident expanded range.
This utility model embodiment provides a kind of multiple transformers differential protective system, above-mentioned including two sets or more than two sets
Differential protective system, and at least two transformators；
Beyond between at least two transformators, the mode of bridging line connects；
Two sets or more than two sets differential protective systems cross-over configuration on the bridge chopper circuit of outer bridging line mode.Specifically
Ground,
Outer bridging line is as shown in figure 4, bridge chopper (3DL) (circuit and transformator on the outside of the high voltage side of transformer chopper
Between chopper).When the transformator input of outer bridging line, disconnection, maintenance or failure, the normal operation in other loops is not interfered with.
But when circuit input, disconnection, maintenance or failure, then can affect the normal operation of a transformator.Therefore outer bridging line is only fitted
Often input or situation about disconnecting is needed for transformator according to economical operation.In addition when there is larger penetration on circuit
When, for avoiding penetration by multiple stage chopper, generally adopt outer bridging line
Chopper and disconnecting switch number of units used in Gratz connection is few, and its power distribution equipment floor space is also little, Neng Gouman
The requirement of sufficient electric substation's reliability, with certain operational flexibility.It is two that Gratz connection is applied to circuit for twice, transformator
AC traction substation and railway substation of platform etc..
Using this programme, on the premise of keeping outer bridging line form constant, electric current has been matched somebody with somebody in the line side increasing of entering in transformer station C
Transformer, reduces the protection zone of route protection, the less configuration quantity of line protective devices 1, expands transformator poor
The protection zone of dynamic protection, have studied the differential protective device of transformer of this outer bridging line form suitable, and the difference by transformator
Dynamic protection zone is segmented, and tripping is different to break transformer differential protection is automatically selected according to motionless fault zone
Fault incidence can be limited in Minimum Area by road device.
Propose and construct the outer bridging line bus arrangement form that outer bridge inlet wire installs current transformer additional first.
Propose and construct the brand-new primary system mode of connection and second protection wiring principle, it is therefore prevented that original connection type
Under, high voltage side of transformer D4 point area faults are cut the accident of the corresponding chopper of bridge chopper and higher level transformer station by mistake and are occurred, and
Guarantee protection without dead band；
The differential protective device of transformer for meeting outer bridging line form is proposed and constructs, and first by the differential of transformator
Protection zone is segmented, and enables transformer differential protection to automatically select the different open circuit of tripping according to motionless fault zone
Fault incidence can be limited in Minimum Area by device.
For this kind of mode of connection, reduce the protection domain of route protection, be particularly well-suited to transformer station C and transformer station A
It is not the project of same owner's unit, can shadow of the less transformer station C internal faults to transformer station's A owner's unit to greatest extent
Ring, for transformer station C is that electricity generation system, high speed rail system and industrial enterprise are particularly suitable.
Those skilled in the art can be understood that, for convenience and simplicity of description, the system of foregoing description,
Device and the specific work process of unit, may be referred to the corresponding process in preceding method embodiment, will not be described here.
In several embodiments provided herein, it should be understood that disclosed system, apparatus and method can be with
Realize by another way.For example, device embodiment described above is only schematic, for example, the unit
Divide, only a kind of division of logic function can have other dividing mode, for example multiple units or component when actually realizing
Can in conjunction with or be desirably integrated into another system, or some features can be ignored, or not execute.Another, shown or
The coupling each other for discussing or direct-coupling or communication connection can be the indirect couplings by some interfaces, device or unit
Close or communicate to connect, can be electrical, mechanical or other forms.
The unit that illustrates as separating component can be or may not be physically separate, aobvious as unit
The part for showing can be or may not be physical location, you can be located at a place, or can also be distributed to multiple
On NE.Some or all of unit therein can be selected according to the actual needs to realize the mesh of this embodiment scheme
's.
In addition, each functional unit in this utility model each embodiment can be integrated in a processing unit,
Can be that unit is individually physically present, it is also possible to which two or more units are integrated in a unit.Above-mentioned integrated
Unit both can be realized in the form of hardware, it would however also be possible to employ the form of SFU software functional unit is realized.
If the integrated unit is realized and as independent production marketing or use using in the form of SFU software functional unit
When, can be stored in a computer read/write memory medium.It is based on such understanding, the technical solution of the utility model sheet
The part in other words prior art contributed in matter or all or part of the technical scheme can be with software products
Form is embodied, and the computer software product is stored in a storage medium, is used including some instructions so that a meter
Calculate machine equipment (can be personal computer, server, or network equipment etc.) to execute described in this utility model each embodiment
The all or part of step of method.And aforesaid storage medium includes：USB flash disk, portable hard drive, read only memory (ROM, Read-
Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can be with
The medium of store program codes.
The above, above example only in order to the technical solution of the utility model to be described, rather than a limitation；Although ginseng
This utility model is described in detail according to previous embodiment, it will be understood by those within the art that：Which is still
Technical scheme described in foregoing embodiments can be modified, or equivalent is carried out to which part technical characteristic and replace
Change；And these modifications or replacement, do not make the essence of appropriate technical solution depart from each embodiment technical scheme of this utility model
Spirit and scope.
Claims (10)
1. a kind of differential protective system, including：First line differential protection, the second line differential protection device and a change
Depressor differential protection, it is characterised in that
One end of the first line differential protection connects the second line differential protection device, and the other end connects transformation
The outlet line of device；
One end of the second line differential protection device connects the first line differential protection, and the other end connects transformation
The inlet wire side line road of device；
The first end of the differential protective device of transformer connects the inlet wire side line road of the transformator, the second end cross structure open circuit
Device circuit, the low-pressure side circuit of transformator described in three-terminal link；
The second line differential protection device is entered in the transformator with the circuit connection of the differential protective device of transformer
Line side crossing elimination is configured.
2. differential protective system according to claim 1, it is characterised in that
4th end of the differential protective device of transformer connects the high-pressure side circuit of the transformator.
3. differential protective system according to claim 1 and 2, it is characterised in that the line differential protection device and institute
Differential protective device of transformer is stated by current transformer and the connection.
4. differential protective system according to claim 1 and 2, it is characterised in that the first line differential protection,
The second line differential protection device and a differential protective device of transformer are respectively provided with remote jump defencive function.
5. differential protective system according to claim 1 and 2, it is characterised in that the first line differential protection
It is fibre current differential protection device with the second line differential protection device.
6. differential protective system according to claim 1 and 2, it is characterised in that the differential protective device of transformer is
Current differential protection device.
7. differential protective system according to claim 1 and 2, it is characterised in that the differential protective device of transformer is
Three-terminal differential protection device or four end differential protections or five end differential protections.
8. differential protective system according to claim 1 and 2, it is characterised in that the transformator is arranged in transformer station
Portion.
9. the differential protective system according to any one in claim 1 or 2, it is characterised in that the transformation implement body
For three-phase transformer.
10. a kind of multiple transformers differential protective system, it is characterised in that in including two sets or more than two sets such as claim 1～8
Any one of differential protective system, and at least two transformators；
Described at least two, between transformator, the mode of bridging line in addition connects；
Two sets or two sets of the above differential protective systems cross-over configuration on the bridge chopper circuit of the outer bridging line mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621090107.0U CN206023197U (en) | 2016-09-28 | 2016-09-28 | A kind of differential protective system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621090107.0U CN206023197U (en) | 2016-09-28 | 2016-09-28 | A kind of differential protective system |
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| Publication Number | Publication Date |
|---|---|
| CN206023197U true CN206023197U (en) | 2017-03-15 |
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ID=58260792
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106356820A (en) * | 2016-09-28 | 2017-01-25 | 广东电网有限责任公司揭阳供电局 | Differential protection system |
| CN109167337A (en) * | 2018-09-12 | 2019-01-08 | 合肥多元节电科技有限公司 | A kind of novel three-winding transformer differential protective system |
-
2016
- 2016-09-28 CN CN201621090107.0U patent/CN206023197U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106356820A (en) * | 2016-09-28 | 2017-01-25 | 广东电网有限责任公司揭阳供电局 | Differential protection system |
| CN106356820B (en) * | 2016-09-28 | 2019-05-07 | 广东电网有限责任公司揭阳供电局 | A kind of differential protective system |
| CN109167337A (en) * | 2018-09-12 | 2019-01-08 | 合肥多元节电科技有限公司 | A kind of novel three-winding transformer differential protective system |
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