CN209358242U - A kind of long-range differential protection - Google Patents
A kind of long-range differential protection Download PDFInfo
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- CN209358242U CN209358242U CN201920277054.0U CN201920277054U CN209358242U CN 209358242 U CN209358242 U CN 209358242U CN 201920277054 U CN201920277054 U CN 201920277054U CN 209358242 U CN209358242 U CN 209358242U
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- differential
- protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/28—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
- H02H3/30—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus using pilot wires or other signalling channel
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/34—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model embodiment discloses a kind of long-range differential protection, including differential main protection interconnected, differential local backup protection system and differential remote backup protection system, the traditional differential protection of formula on the spot is converted into remote centralized differential protection, the complete main protection of relay protection required by electric system is built into using same technology, nearly back-up protection and remote back-up protection system, realize scheduling, control, protective device (is adjusted, control, protect) one, generator suitable for any alternating voltage grade, transmission line of electricity, breaker (switch), bus, main transformer (main transformer), reactor, the protection of the primary equipments such as capacitor and low-voltage distribution network annular electric supply route, all standing is realized on the secondary relay protection equipment of electric system, it is remotely located to regulate and control end, with the adjacent power transformation of remote back-up protection Entire failure substation can be isolated in the differential protection for function of standing in time, be effectively prevented the generation of failure substation deflagration accident.
Description
Technical field
The utility model embodiment is related to Relay Protection Technology in Power System field, and in particular to a kind of long-range differential protection
Device.
Background technique
The protective relaying device (referred to as: differential protection) constituted based on spill current principle, it is secondary most main as electric system
Want equipment (to it is direct participate in power generation, transmission of electricity, power transformation, distribution primary equipment controlled, protect, measure, adjust etc. and automated
Low-voltage equipment is known as secondary device), it has been used widely in existing electric system.
Existing differential protection is generally arranged using formula on the spot, its accessory channel (transmission line of electricity Phase Difference High Frequency Protection
Fiber channel or second difference current cable channel) setting on, for installing cost and reliability in terms of the considerations of, only exist
Some occasions that voltage class is high or accessory channel distance is close, investment is small, highly reliable just will use, and standby can not be improved by existing
Defencive function problem, back-up protection can only be equipped with other technical principles again, and (Pump wave, the distance being made of impedor are protected
Shield, the zero-sequence current that is made of zero-sequence direction component and low-voltage overcurrent protection etc.) protective device that constitutes gives and supplements,
Complete primary equipment main protection, nearly back-up protection and remote back-up protection system can be formed.
Utility model content
For this purpose, the utility model embodiment provides a kind of long-range differential protection, with solve it is in the prior art on the spot
Formula differential protection back-up protection is not perfect, needs to be equipped with other kinds of protective device and is supplemented, while needing to be arranged auxiliary
Channel, the problem of installing at high cost, poor reliability.
To achieve the goals above, the utility model embodiment provides the following technical solutions: a kind of long-range differential protection dress
It sets, described device includes differential main protection, differential local backup protection system and differential remote back-up protection dress interconnected
It sets, the differential main protection includes that two main protection breakers, two main protection current transformers and main protection are differential
Relay, the main protection current transformer are connected to two main protection breaker sides, two main protection Current Mutual Inductances
Device is remotely connected to the input terminal of main protection differential relay by data/address bus, and two main protection breakers pass through data/address bus
It is remotely connected to the output end of main protection differential relay, the differential local backup protection system includes two nearly standby open circuits
Device, two nearly standby current transformers and nearly standby differential relay, the nearly standby current transformer are connected to two
A nearly back-up breaker side, two nearly standby current transformers are remotely connected to nearly standby differential relay by data/address bus
Input terminal, two nearly back-up breakers are remotely connected to the output end of nearly standby differential relay by data/address bus, described
Differential remote backup protection system includes two remote back-up breakers, two remote standby current transformers and the differential relay of remote standby
Device, the remote standby current transformer are connected to two remote back-up breaker sides, and two remote standby current transformers are logical
The input terminal that data/address bus is remotely connected to remote standby differential relay is crossed, two remote back-up breakers are long-range by data/address bus
It is connected to the output end of remote standby differential relay.
Further, the differential main protection includes Line Differential main protection, the Line Differential main protection
Device includes two power line main protection breakers for being set to difference on transmission line of electricity, each power line main protection breaker side
It is respectively connected with a power line main protection current transformer, two power line main protection current transformers pass through data/address bus and remotely connect
It is connected to the input terminal of a power line main protection differential relay, two power line main protection breakers are connected to institute by data/address bus
State the output end of power line main protection differential relay.
Further, the differential main protection includes main transformer differential main protection, the differential main protection
Three main transformer main protection breakers including being respectively arranged at main transformer high-pressure side, medium voltage side and low-pressure side, each main transformer main protection
Breaker side is respectively connected with a main transformer main protection current transformer, and three main transformer main protection current transformers pass through data
Bus is remotely connected to the input terminal of a main transformer main protection differential relay, and three main transformer main protection breakers pass through data
Bus is remotely connected to the output end of the main transformer main protection differential relay.
Further, the differential main protection includes the differential main protection of chief and vice mother, and the chief and vice mother is poor
Dynamic main protection includes the positive bus-bar connected by mother route with a plurality of branch and secondary bus, is arranged on the mother route
There are busbar breaker and bus connection switch, positive pole plug-in strip, secondary female plug-in strip and shunt circuitbreaker, the mother are provided in the branch
Connection breaker and shunt circuitbreaker side are respectively connected with a chief and vice female main protection current transformer, and chief and vice mother's main protection electric current is mutual
Sensor passes through the input terminal that data/address bus is remotely connected to positive pole differential relay and secondary female differential relay, and the mother is disconnected
Road device and shunt circuitbreaker pass through the output that data/address bus is remotely connected to positive pole differential relay and secondary female differential relay
End.
Further, the differential main protection includes the differential main protection of radiant type switching station looped network, the spoke
The differential main protection of She Shi switching station looped network is including the first substation, the second substation and is connected to the first substation in turn
And second multiple switching stations between substation, a switching station master is provided in first substation and the second substation
Protective breaker, there are two switching station's main protection breaker, switching station's main protection breakers one for setting in the switching station
Side is respectively connected with switching station's main protection current transformer, is arranged between the first substation and adjacent switching station, Mei Gekai
Close between internal, switching station and adjacent switching station and the main guarantor of Liang Ge switching station between the second substation and adjacent switching station
Shield current transformer passes through the input terminal that data/address bus is remotely connected to switching station's main protection differential relay respectively, with two
The corresponding Liang Ge switching station main protection breaker of a switching station's main protection current transformer passes through data/address bus respectively and remotely connects
It is connected to the output end of switching station's main protection differential relay.
Further, the differential local backup protection system includes the nearly backup unit of bus differential, and the bus differential is close
Backup unit includes the positive bus-bar and secondary bus by mother connection, and the positive bus-bar or secondary bus are connected with a plurality of point
Road is provided with nearly back-up breaker on the mother route and branch, and the nearly back-up breaker side is respectively connected with one
Nearly standby current transformer, the nearly standby current transformer pass through data/address bus be remotely connected to a nearly standby it is differential after
The input terminal of electric appliance, the nearly back-up breaker pass through data/address bus and are remotely connected to the defeated of the nearly standby differential relay
Outlet.
Further, switching station's main protection differential relay is set as multisection type differential relay, the switching station
The rear side feedback point of main protection differential relay extends back, and to form radiant type switching station looped network differential for a breaker
The nearly back-up protection of main protection.
Further, the differential remote backup protection system includes substation's remote backup protection system, the substation
Three outgoing line sides are separately connected a plurality of high-tension line, medium-voltage line and low-voltage circuit, substation's remote backup protection system packet
A remote back-up breaker being arranged on every outlet route of the substation is included, the remote back-up breaker side is all connected with
There is a remote standby current transformer, two remote standby current transformers positioned at two opposite outlet routes of substation are equal
The input terminal of a remote standby differential relay is remotely connected to by data/address bus, it is opposite with two remote standby current transformers
The remote back-up breaker of two answered is remotely connected to the output end of the remote standby differential relay by data/address bus.
Further, the main protection differential relay, nearly standby differential relay and remote standby differential relay are equal
It is set as digital differential relaying relay, and trip command is sent to the breaker connected by data/address bus.
The utility model embodiment has the advantages that
A kind of long-range differential protection that the utility model embodiment proposes, including it is differential main protection, differential close
The traditional differential protection of formula on the spot is converted to remote centralized by reserve protection and differential remote backup protection system
Differential protection, using same differential protecting technology be built into the complete main protection of relay protection required by electric system, it is close after
Standby protection and remote back-up protection system realize that one (is adjusted, control, protected) to scheduling, control, protective device, are suitable for any alternating current
Press generator, transmission line of electricity, breaker (switch), bus, main transformer (main transformer), reactor, capacitor and the low pressure of grade
The protection of the primary equipments such as distribution annular electric supply route is realized all standing on the secondary relay protection equipment of electric system, is regulated and controled
Hold differential protection remotely located, with remote back-up protection adjacent substations function that entire failure power transformation can be isolated in time
It stands, is effectively prevented the generation of failure substation deflagration accident.
Detailed description of the invention
It, below will be to reality in order to illustrate more clearly of the embodiments of the present invention or technical solution in the prior art
It applies mode or attached drawing needed to be used in the description of the prior art is briefly described.It should be evident that attached in being described below
Figure is only exemplary, for those of ordinary skill in the art, without creative efforts, can be with
It is extended according to the attached drawing of offer and obtains other implementation attached drawings.
Structure depicted in this specification, ratio, size etc., only to cooperate the revealed content of specification, for
Those skilled in the art understands and reads, and is not intended to limit the utility model enforceable qualifications, therefore does not have technology
On essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size are not influencing the utility model institute energy
Under the effect of generation and the purpose that can reach, it should all still fall in the revealed technology contents of the utility model and obtain the model that can cover
In enclosing.
Fig. 1 is a kind of structural schematic diagram for long-range differential protection that the utility model embodiment 1 provides；
Fig. 2 is a kind of long-range differential protection data collection data bus connection that the utility model embodiment 1 provides
Schematic diagram；
Fig. 3 is a kind of long-range differential protection Line Differential main protection schematic diagram that the utility model embodiment 1 provides；
Fig. 4 is a kind of long-range differential protection main transformer differential main protection schematic diagram that the utility model embodiment 1 provides；
Fig. 5 is that a kind of bus for long-range chief and vice mother mode of differential protection that the utility model embodiment 1 provides is poor
The dynamic main schematic diagram of main protection；
Fig. 6 is a kind of long-range following radial pattern power supply electricity of differential protection 35kV that the utility model embodiment 1 provides
Anti- device outlet main protection schematic diagram；
Fig. 7 is a kind of long-range differential protection radial pattern power supply switching station's looped network that the utility model embodiment 1 provides
The differential main protection schematic diagram stood；
Fig. 8 is a kind of long-range differential protection route+unilateral side bus differential protecting that the utility model embodiment 1 provides
Nearly standby schematic diagram；
Fig. 9 is a kind of long-range differential protection route+bilateral bus differential protecting that the utility model embodiment 1 provides
Nearly standby schematic diagram；
Figure 10 is that a kind of long-range differential protection bus+transform er differential protection that the utility model embodiment 1 provides is close
Standby schematic diagram；
Figure 11 is a kind of switching station's ring for long-range differential protection radial pattern power supply that the utility model embodiment 1 provides
The nearly standby schematic diagram of the differential protection of website；
After Figure 12 is a kind of remote centered on substation of the long-range differential protection that provides of the utility model embodiment 1
Standby schematic diagram.
In figure: differential main protection 1, differential local backup protection system 2, differential remote backup protection system 3, main protection are disconnected
Road device 11, main protection current transformer 12, main protection differential relay 13, nearly back-up breaker 21, nearly standby current transformer
22, nearly standby differential relay 23, remote back-up breaker 31, remote standby current transformer 32, remote standby differential relay 33.
Specific embodiment
The embodiments of the present invention is illustrated by particular specific embodiment below, those skilled in the art can be by this
Content disclosed by specification understands other advantages and effect of the utility model easily, it is clear that described embodiment is
The utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work belongs to the utility model protection
Range.
Embodiment 1
As shown in Figure 1, the present embodiment proposes a kind of long-range differential protection, which includes interconnected differential
Main protection 1, differential local backup protection system 2 and differential remote backup protection system 3.
Differential main protection 1 includes two main protection breakers, 11, two main protection current transformers 12 and main guarantor
Differential relay 13 is protected, main protection current transformer 12 is connected to two 11 sides of main protection breaker, two main protections
Current transformer 12 is remotely connected to the input terminal of main protection differential relay 13, two main protection breakers by data/address bus
11 are remotely connected to the output end of main protection differential relay 13 by data/address bus.
Differential local backup protection system 2 include two nearly back-up breaker 21, two nearly standby current transformers 22 and
Nearly standby differential relay 23, nearly standby current transformer 22 are connected to two 21 sides of nearly back-up breaker, and two close
Standby current transformer 22 is remotely connected to the input terminal of nearly standby differential relay 23 by data/address bus, and two nearly standby are disconnected
Road device 21 is remotely connected to the output end of nearly standby differential relay 23 by data/address bus.
Differential remote backup protection system 3 include two remote back-up breaker 31, two remote standby current transformers 32 and
Remote standby differential relay 33, remote standby current transformer 32 are connected to two 31 sides of remote back-up breaker, and two remote
Standby current transformer 32 is remotely connected to the input terminal of remote standby differential relay 33 by data/address bus, and two remote standby are disconnected
Road device 31 is remotely connected to the output end of remote standby differential relay 33 by data/address bus.
The traditional differential protection of formula on the spot is converted into remote centralized differential protection, as shown in Fig. 2, with factory,
It stands, be unit, by the corresponding analog quantity of each breaker digital quantization on the spot, and carries out distributed collection, utilize traditional data
Intensive data bus mode is transmitted to each control station layer, takes according to each each demand of dispatch layer compass of competency, to realize spill current original
Manage all standing of the main protection, nearly back-up protection, remote back-up protection that constitute on secondary equipment in power system.
Main protection differential relay, nearly standby differential relay and remote standby differential relay are disposed as digital difference
Motor type relay, and trip command is sent to the breaker connected by data/address bus.
1, the differential main protection of element
(1) Line Differential main protection (by taking 220kV route as an example)
As shown in figure 3, differential main protection 1 includes Line Differential main protection 1, Line Differential main protection 1
Two power line main protection breakers 1DL, 2DL including being set to difference on transmission line of electricity, each power line main protection breaker
Side is respectively connected with power line main protection current transformer 1CT, a 2CT, and two power line main protection current transformers 1CT, 2CT are equal
The input terminal of power line main protection differential relay a 1DL or 2DL, two power line main protections are remotely connected to by data/address bus
Breaker 1DL, 2DL are connected to the output end of power line main protection differential relay by data/address bus.
Digital differential relaying relay is traditional protective relaying device, operation equation formula are as follows:
Wherein IcdzdFor differential protection setting valve, for transmission line of electricity, m 2.
The digital differential relaying relay and traditional differential protection (protection of phase comparison expression high frequency differential) technology
Principle is close, but it is not necessarily to respectively install differential protection (additional auxiliary high frequency channel) in the two sides of route to control this
Side switchs (breaker), but data are exchanged by way of Data Data bus, and installs a number of units in dispatching control center
Word formula differential protection (differential relay), when flow valuve of being on duty is greater than setting valve (spill current spilling), i.e., with remote prosecutor formula pair
The breaker of two different locations issues trip command.
It can if power line main protection breaker 1DL, 2DL are same scheduling institution for the dual requirement of protective device
In same regulation, two sets of mutually independent protective devices are set.Power line main protection breaker 1DL, 2DL are different dispatchers
When structure, a set of protective device respectively can be set in the regulating and controlling mechanism of two places, the sampled data of two places is shared, allows opposite side differential protection
Device sends out trip command to this side breaker.
Reliability and stability according to system require settable delay number differential protection, to realize this protection completely
Road, stage emergency function.The reclosing of route still uses traditional reclosing mode, accelerates differential protection latter end.To add
The compound sequence voltage component of its strong reliability two sides is latched poor flow valuve with behind the door.The route of other voltage class is protected
Shield and generator protection can refer to the setting.
(2) main transformer (depressor) differential main protection (by taking 220kV main transformer as an example)
As shown in figure 4, differential main protection 1 includes main transformer differential main protection 1, differential main protection 1 includes
It is respectively arranged at three main transformers main protection breaker 1DL, 2DL, 3DL of main transformer high-pressure side, medium voltage side and low-pressure side, each main transformer
The side main protection breaker DL is respectively connected with a main transformer main protection Current Transmit, three main transformer main protection current transformers
1CT, 2CT, 3CT pass through the input terminal that data/address bus is remotely connected to a main transformer main protection differential relay, three main transformers
Main protection breaker 1DL, 2DL, 3DL pass through the output end that data/address bus is remotely connected to main transformer main protection differential relay.
Reliability and stability according to main transformer require that delay number differential protection can be added, to realize transform er differential protection rank
Segmentation emergency function.The traditional compound sequence voltage component of starting element, is latched spill current setting valve.To transformer
Excitation surge current and wiring group access differential relay after carrying out traditional processing；Because using standard no-load voltage ratio CT (electric current
Mutual inductor) caused by material unaccounted for electric current need to be hidden.When slime flux of being on duty goes out, main transformer main protection differential relay is to three sides
Breaker 1DL, 2DL, 3DL send out trip command.
(3) chief and vice female, mother mode bus differential main protection (for 220kV common wiring pattern mode)
As shown in figure 5, differential main protection 1 includes the differential main protection 1 of chief and vice mother, the chief and vice differential main guarantor of mother
Protection unit 1 includes the positive bus-bar connected by mother route with a plurality of branch XL1-XLN and secondary bus, is provided on mother route
Busbar breaker MDL and bus connection switch are provided with positive pole plug-in strip, secondary female plug-in strip and shunt circuitbreaker 1DL-NDL in branch, female
Connection breaker MDL and the side shunt circuitbreaker 1DL-NDL are respectively connected with a chief and vice female main protection Current Transmit, chief and vice mother
Main protection current transformer 1CT-NCT passes through data/address bus and is remotely connected to positive pole differential relay and secondary female differential relay
Input terminal, busbar breaker MDL and shunt circuitbreaker 1DL-NDL pass through data/address bus and are remotely connected to the differential relay of positive pole
The output end of device and secondary female differential relay.
The current sampling data of busbar breaker MDL both participates in positive pole, secondary female differential relay；Each route XL1-XLN electric current
Sampled value follows the position of bus plug-in strip to participate in positive pole, secondary female differential relay；The trip command of each line-breaker 1DL-NDL
Also it accordingly follows.
When the chief and vice female plug-in strip of any bar wire-outgoing breaker closes a floodgate (inline), chief and vice mother's differential relay is merged into single mother
Line differential relay, the trip command of each line-breaker is not by bus plug-in strip position control；Bus connection switch at this time is not involved in
Differential relay.Setup phase formula differential relay, to realize the emergency function of this protection.The traditional compound sequence of starting element
Voltage component, the differential relay that chief and vice mother's compound sequence voltage component respectively corresponds to oneself are latched spill current overflow value.
The different modes of connection, different voltages grade bus differential protecting be referred to the above method and establish bus differential protecting.
(4) route of 35kV or less radial pattern power supply (single supply and opposite side is without breaker) and the main guarantor of reactor, capacitor
It protects (by taking reactor outlet as an example)
As shown in fig. 6, capacitor, reactor protection can set up longitudinal differential relay respectively and laterally (three-phase current is flat
Weighing apparatus: Ia+Ib-Ic, Ib+Ic-Ia, Ic+Ia-Ib) differential relay.Single supply and opposite side are set up vertical without the route of breaker
To differential relay.Multisection type differential relay is set, to realize the emergency function of this protection.The reclosing of charge circuit is still
Using traditional reclosing mode, accelerate differential relay latter end.
(5) the differential main protection (by taking 10kV route as an example) at radial pattern power supply switching station's looped network station
As shown in fig. 7, differential main protection 1 includes the differential main protection 1 of radiant type switching station looped network, radiant type is opened
The differential main protection 1 of institute's looped network is closed to include the first substation, the second substation and be connected to the first substation and the in turn
Switching station's main protection open circuit is provided in multiple switching stations between two substations, the first substation and the second substation
Device 1DL, NDL, there are two switching station's main protection breaker 2DL- (N-1) DL, switching station's main protection breakers for setting in switching station
The side 1DL-NDL is respectively connected with a switching station main protection current transformer 1CT-NCT, and setting is opened in the first substation with adjacent
It closes between institute, inside each switching station, between switching station and adjacent switching station and between the second substation and adjacent switching station
Liang Ge switching station main protection Current Transmit pass through data/address bus to be respectively remotely connected to switching station's main protection differential
The input terminal of relay, Liang Ge corresponding with Liang Ge switching station main protection Current Transmit switching station main protection breaker point
The output end of switching station's main protection differential relay is not remotely connected to by data/address bus.
Normal power supply mode: the first substation passes through switching station's main protection breaker 1DL to switching station 1, switching station
2, it ... powers to substation 2NDL line side load, 2 side NDL stand-by heat of substation.Differential relay 1, differential relay 2,
Differential relay 3, differential relay 4 ... be respectively provided with multisection type differential relay.
When breaking down in the section route XL1, sends out and jump from differential relay 1 to switching station main protection breaker 1DL, 2DL
Lock is enabled and is overlapped, and 1 latter end of differential relay is then accelerated to jump switching station's main protection breaker 1DL, 2DL if permanent fault.Difference
1 latter end of motor type relay trip acceleration signals and other conditions starting automatic throw-in equipment of emergency power supply (referred to as: prepared auto restart) through when
Between delay (general 5s-10s) close the second transformer substation side NDL, be isolated with reaching fault section, health equipment continue power supply mesh
's.Bus bar side failure in switching station 1；XL2 line fault；Bus bar side failure in switching station 2；..., action process referring to
Upper step.
With when switching station's main protection breaker NDL Electromagnetic coupling, backup auto-activating device is deactivated, and differential relay under upper type
Action value should be greater than 1.5 times of switching station's maximum load current.
2, the stage short distance standby differential protection centered on element protection
(1) route+nearly standby of unilateral side bus differential protecting (by taking 220kV route as an example)
As shown in figure 8, differential local backup protection system 2 includes the nearly backup unit of bus differential, the nearly standby dress of bus differential
It sets including the positive bus-bar and secondary bus by mother connection, positive bus-bar or secondary bus are connected with a plurality of branch XL2-XLN, female
Nearly back-up breaker MDL, 3DL-NDL, the side nearly back-up breaker MDL, 3DL-NDL are provided on line road XLM and branch
It is respectively connected with nearly standby current transformer MCT, a 3CT-NCT, nearly standby current transformer MCT, 3CT-NCT pass through data
Bus is remotely connected to the input terminal of a nearly standby differential relay, and nearly back-up breaker MDL, 3DL-NDL pass through data
Bus is remotely connected to the output end of nearly standby differential relay.
The nearly standby for being set as above-mentioned 1 (1) line differential protection main protection of the protection, while being also above-mentioned 1 (3) second
The nearly standby of substation's positive pole (or secondary female) bus differential protecting main protection.When differential relay difference slime flux goes out, first send out 1DL1,
2DL tripping enables, 200ms hair 3DL, 4DL, 5DL ... NDL the tripping order that is delayed again if failure does not disappear.Standby trip time and phase
The main protection cooperation answered.Whether reclosing is determined by system stability requirement after DL1, DL2 tripping；If 3DL, 4DL, 5DL ..., NDL is jumped
Lock then forbids reclosing.The standby eliminate 2DL between CT the positive pole bus differential protecting main protection of the second substation it is dead
Area.Benefit uses multistage mode, to realize the emergency function of this protection.
(2) route+nearly standby of bilateral bus differential protecting (by taking 220kV route as an example)
As shown in figure 9, the nearly standby for being set as above-mentioned 1 (1) line differential protection main protection of the protection；On being also simultaneously
State secondary female and the positive pole bus differential protecting main protection of the second substation the nearly standby of 1 (3) first substation.
When differential relay difference slime flux goes out, first sends out DL11, DL21 tripping and enable, the 200ms hair that is delayed again if failure does not disappear
DL13, DL14, DL15----DL1N on the secondary mother of one substation, which trip, to be enabled, send out DL23, DL24 in second substation's positive pole,
DL25----DL2N tripping enables.The standby trip time cooperates with corresponding main protection.DL11, DL21 tripping after whether reclosing by
System stability requirement is fixed；If DL13, DL14, DL15----DL1N tripping on the secondary mother of the first substation, second substation's positive pole
On DL23, DL24, DL25----DL2N tripping then forbid reclosing.
The nearly standby eliminates the secondary female upper DL11 of the first substation to female differential main protection secondary between CT and the second substation
DL21 is to the dead zone of the differential main protection of positive pole between CT in positive pole.Benefit uses multistage mode, to realize the emergency function of this protection.
Route+nearly standby of unilateral side bus differential protecting and route+nearly standby of bilateral bus differential protecting, can choose makes
With.
(3) the nearly standby of bus differential protecting
The nearly standby of bus differential protecting only for double-bus+mother, (by taking 220kV bus as an example, transport by 220kV bus connection switch
Row) the nearly standby of differential protection, which is not involved in differential relay, that is, 1 (3) (interior the United Nations General Assembly is poor)
Chief and vice mother's differential relay is merged into nearly standby when single busbar differential relay；The trip command of each line-breaker is not by mother
The control of cable brake cutter position.
The nearly standby of bus differential protecting need to cooperate with bus differential protecting main protection, the bus wiring side of other voltage class
Whether formula is arranged the nearly standby of bus differential protecting is determined by system stability requirement.
(4) the nearly standby of bus+transform er differential protection (by taking 220kV main transformer as an example)
As shown in Figure 10, the nearly standby of bus+transform er differential protection is respectively the differential main protection of single busbar and main transformer differential master
The nearly standby of protection, eliminates each breaker in three side of main transformer to the dead zone of main protection between CT (current transformer).
First hair DL1, DL2 and DL3 tripping enables poor slime flux out, if failure does not disappear, the 200ms that is delayed is sent out again
DL13DL14DL15----DL1N tripping enables, DL23DL24DL25----DL2N tripping enables and DL31DL32DL33----DL3N is jumped
Lock enables.
Each outlet of 35 kV Side of Main Transformer, capacitor, reactor and mother stock interval should install complete three-phase type current transformer additional,
Secondary side current should carry out phase shift according to the wiring group of main transformer, because using caused by standard no-load voltage ratio CT (current transformer) not
Balance spill current need to be hidden.
Its excitation surge current can not be considered to guarantor if its trip time is greater than 200ms as the nearly back-up protection of main transformer
The influence of protection unit.
For some not set busbar differential protection devices of 110kV, 35kV one-end substation, main transformer switch CT is to out
By the protection of excision of no short time failure between wiretap CT, the setting of the nearly back-up protection is by the effective solution above problem.
(5) the nearly standby of differential protection (by taking 10kV route as an example) at switching station's looped network station of radial pattern power supply
As shown in figure 11, switching station's main protection differential relay is set as multisection type differential relay, switching station's main protection
Extend back breaker of the rear side feedback point of differential relay forms the differential main protection 1 of radiant type switching station looped network
Nearly back-up protection.
Normal power supply mode: the first substation passes through 1DL to switching station 1, the line side switching station 2 to substation 2NDL load
Power supply, the second transformer substation side NDL stand-by heat.Differential relay 1, differential relay 2, differential relay 3, differential relay
4 ... it is respectively provided with multisection type differential relay.
As the nearly standby of main protection, the protection scope of differential relay 1 is greatly to 3DL, the protection scope of differential relay 2
Greatly to 4DL, and so on, with deadband eliminating.
Whether nearly back-up protection delay outlet tripping starts reclosing and prepared auto restart is determined by system stabilization and reliability requirement
It is fixed.With when NDL Electromagnetic coupling, backup auto-activating device is deactivated under upper type.
(6) the nearly standby of whole station formula
Under nearly standby (by taking the 220kV main transformer as an example) mode of preceding 2 (4) bus+transform er differential protection, if 220kV mother,
Whole station formula nearly standby in part is just split into the case of 110kV mother, the equal disjunction of 35kV block switch, 220kV mother, 110kV are female
Connection, 35kV block switch are not involved in differential relay.
If 220kV mother, 110kV mother, the operation of 35kV block switch thrin under 2 (4) modes, 220kV mother,
110kV mother, 35kV block switch are still not involved in differential relay, all outlet switchs in the station (including capacitor, reactor)
CT both participate in differential relay, the differential relay under which just helps the nearly standby differential relay of standing posture；Differential relay
After device difference slime flux goes out, it is delayed and sends out tripping order to all outlet switchs.
The one-end substation of the female poor main protection of and not set senior middle school low for voltage class low-pressure side should be arranged whole station formula or
Part whole station formula short distance standby differential protection.The nearly standby of whole station formula is forbidden to use reclosing.
3, the remote standby centered on substation (the remote standby of whole station formula) differential protection is (with 220kV, 110kV, 35kV
For the substation of three voltage class)
As shown in figure 12, differential remote backup protection system 3 includes substation's remote backup protection system, and three of substation go out
Line side is separately connected a plurality of high pressure (220kV) route XL21-XL2N, middle pressure (110kV) route XL11-XL1N and low pressure (35kV)
Route XL31-XL3N, substation's remote backup protection system include a remote standby being arranged on every outlet route of substation
Breaker, respectively DL21-DL2N, DL11-DL1N, DL31-DL3N, remote back-up breaker DL21-DL2N, DL11-DL1N,
The side DL31-DL3N is respectively connected with remote standby Current Transmit 21-CT2N, CT11-CT1N, a CT31-CT3N, is located at and becomes
The remote standby current transformer of two of the opposite outlet route of two of power station passes through data/address bus and is remotely connected to one far
The input terminal of standby differential relay, two remote back-up breakers corresponding with two remote standby current transformers pass through data
Bus is remotely connected to the output end of remote standby differential relay.
At the protection scope of the remote standby differential protection to all outlet opposite side CT, when any one is sent out in the region
When raw failure, which will all become standby.
Occur under above situation, while when direct current (battery) the system damage at the station, the electrical secondary system at the station will paralyse,
It can only be switched at this time by all opposite sides that neighbor stations institute delay cutoff is attached thereto, otherwise the substation will suffer from crushing wound
Evil.The switch of multiple at least one voltage class of unit in the station is attached, and otherwise the whole station formula, which will follow, splits into
The remote standby of multiple substation formulas.
The present embodiment propose a kind of long-range differential protection, differential main protection, nearly standby and remote back-up protection by
Separately protected device is completed, while the hair tripping of Xiang Duotai breaker enables, and the practical fault time error very little that cuts off is (when successive relay trip
Between it is poor), therefore the differential protection time of multisection type setting it is differential shorten to 200ms, according to previous experiences 110kV and the above voltage
The back-up protection of grade ring network power supply route did not occurred cutting off failure by four sections of three sections of distance protection and zero-sequenceprotection
Probability, i.e. remote back-up need not consider lower next stage transmission line of electricity, therefore the remote standby of differential protection is only
In view of the end of adjacent lines overall length；The detonation thing of whole transformer station occurs often, and key reason is: having remote standby
The distance of defencive function, zero-sequenceprotection extended segment do not touch transformer mesolow side near terminal fault point, if the power transformation at this time
Simultaneously with failure, the control of substation, protection system will paralyse the DC power supply stood completely.So differential protection is remote
Back-up protection must be (remote see 3, centered on substation comprising adjacent substations transformer mesolow side near terminal fault point
Standby differential protection), to prevent the generation of whole transformer station deflagration accident.
The strange landization setting (one is protected in regulation) of protective device, will propose higher want to the reliability of data transmission set
It asks, it is very important for the active and standby setting of transmission channel, parallel setting, the abnormality alarming in channel and automatic switchover；System
Other secondary devices are such as: automatic throw-in equipment of emergency power supply, low all load sheddings and fault disconnection device, overload connection cut device
It can carry out remotely located；The saturation problem of Current Transmit will generate large error to the acquisition of data, it should fully consider.
Although above having made detailed description to the utility model with generality explanation and specific embodiment,
On the basis of the utility model, it can be made some modifications or improvements, this is apparent to those skilled in the art
's.Therefore, these modifications or improvements on the basis of without departing from the spirit of the present invention, belong to the utility model and want
Seek the range of protection.
Claims (9)
1. a kind of long-range differential protection, which is characterized in that described device includes differential main protection interconnected, difference
Dynamic local backup protection system and differential remote backup protection system, the differential main protection include two main protection breakers,
Two main protection current transformers and main protection differential relay, the main protection current transformer are connected to two masters
Protective breaker side, two main protection current transformers are remotely connected to the defeated of main protection differential relay by data/address bus
Enter end, two main protection breakers are remotely connected to the output end of main protection differential relay by data/address bus, described differential
Local backup protection system includes two nearly back-up breakers, two nearly standby current transformers and nearly standby differential relay,
The nearly standby current transformer is connected to two nearly back-up breaker sides, and two nearly standby current transformers pass through number
The input terminal of nearly standby differential relay is remotely connected to according to bus, two nearly back-up breakers are remotely connected by data/address bus
To the output end of nearly standby differential relay, the differential remote backup protection system include two remote back-up breakers, two far
Standby current transformer and remote standby differential relay, it is disconnected that the remote standby current transformer is connected to two remote standby
Road device side, two remote standby current transformers are remotely connected to the input terminal of remote standby differential relay by data/address bus,
Two remote back-up breakers are remotely connected to the output end of remote standby differential relay by data/address bus.
2. a kind of long-range differential protection according to claim 1, which is characterized in that the differential main protection packet
Line Differential main protection is included, the Line Differential main protection includes two lines for being set to difference on transmission line of electricity
Road main protection breaker, each power line main protection breaker side are respectively connected with a power line main protection current transformer, and two
Power line main protection current transformer passes through the input terminal that data/address bus is remotely connected to a power line main protection differential relay,
Two power line main protection breakers are connected to the output end of the power line main protection differential relay by data/address bus.
3. a kind of long-range differential protection according to claim 1, which is characterized in that the differential main protection packet
Main transformer differential main protection is included, the differential main protection includes being respectively arranged at main transformer high-pressure side, medium voltage side and low pressure
Three main transformer main protection breakers of side, it is mutual that each main transformer main protection breaker side is respectively connected with a main transformer main protection electric current
Sensor, three main transformer main protection current transformers pass through data/address bus and are remotely connected to a main transformer main protection differential relay
Input terminal, three main transformer main protection breakers pass through data/address bus and are remotely connected to the main transformer main protection differential relay
Output end.
4. a kind of long-range differential protection according to claim 1, which is characterized in that the differential main protection packet
The differential main protection of chief and vice mother is included, the chief and vice differential main protection of mother includes passing through mother route and a plurality of branch
The positive bus-bar of connection and secondary bus are provided with busbar breaker and bus connection switch on the mother route, are arranged in the branch
There are positive pole plug-in strip, secondary female plug-in strip and shunt circuitbreaker, the busbar breaker and shunt circuitbreaker side to be respectively connected with one
Chief and vice mother's main protection current transformer, chief and vice mother's main protection current transformer passes through data/address bus, and to be remotely connected to positive pole differential
The input terminal of relay and secondary female differential relay, the busbar breaker and shunt circuitbreaker pass through data/address bus and remotely connect
It is connected to the output end of positive pole differential relay and secondary female differential relay.
5. a kind of long-range differential protection according to claim 1, which is characterized in that the differential main protection packet
The differential main protection of radiant type switching station looped network is included, the differential main protection of radiant type switching station looped network includes the first change
Power station, the second substation and the multiple switching stations being connected in turn between the first substation and the second substation, described first
Switching station's main protection breaker is provided in substation and the second substation, there are two opening and closings for setting in the switching station
Institute's main protection breaker, switching station's main protection breaker side are respectively connected with switching station's main protection current transformer,
It is arranged between the first substation and adjacent switching station, inside each switching station, between switching station and adjacent switching station and the
Liang Ge switching station main protection current transformer between two substations and adjacent switching station passes through data/address bus respectively and remotely connects
To the input terminal of switching station's main protection differential relay, two corresponding with Liang Ge switching station main protection current transformer
Switching station's main protection breaker passes through the output that data/address bus is remotely connected to switching station's main protection differential relay respectively
End.
6. a kind of long-range differential protection according to claim 2 or 3, which is characterized in that the differential nearly standby is protected
Protection unit includes the nearly backup unit of bus differential, and the nearly backup unit of the bus differential includes the positive pole by mother connection
Line and secondary bus, the positive bus-bar or secondary bus are connected with a plurality of branch, after being provided on the mother route and branch closely
Standby breaker, the nearly back-up breaker side is respectively connected with a nearly standby current transformer, the nearly standby Current Mutual Inductance
Device passes through the input terminal that data/address bus is remotely connected to a nearly standby differential relay, and the nearly back-up breaker passes through
Data/address bus is remotely connected to the output end of the nearly standby differential relay.
7. a kind of long-range differential protection according to claim 5, which is characterized in that switching station's main protection is differential
Relay is set as multisection type differential relay, and the rear side feedback point of switching station's main protection differential relay extends back
One breaker forms the nearly back-up protection of the differential main protection of radiant type switching station looped network.
8. a kind of long-range differential protection according to claim 1, which is characterized in that the differential remote back-up protection dress
It sets including substation's remote backup protection system, three outgoing line sides of the substation are separately connected a plurality of high-tension line, middle crimping
Road and low-voltage circuit, substation's remote backup protection system include one be arranged on every outlet route of the substation
Remote back-up breaker, the remote back-up breaker side is respectively connected with a remote standby current transformer, positioned at the two of substation
The remote standby current transformer of two of a opposite outlet route passes through data/address bus, and to be remotely connected to a remote standby differential
The input terminal of relay, two remote back-up breakers corresponding with two remote standby current transformers are long-range by data/address bus
It is connected to the output end of the remote standby differential relay.
9. a kind of long-range differential protection according to claim 1, which is characterized in that the differential relay of main protection
Device, nearly standby differential relay and remote standby differential relay are disposed as digital differential relaying relay, and total by data
Line sends trip command to the breaker connected.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
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| CN201920277054.0U CN209358242U (en) | 2019-03-05 | 2019-03-05 | A kind of long-range differential protection |
| PCT/CN2019/110056 WO2020177320A1 (en) | 2019-03-05 | 2019-10-09 | Remote differential protection device |
| DE112019003016.7T DE112019003016T5 (en) | 2019-03-05 | 2019-10-09 | Remote differential protection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920277054.0U CN209358242U (en) | 2019-03-05 | 2019-03-05 | A kind of long-range differential protection |
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| DE (1) | DE112019003016T5 (en) |
| WO (1) | WO2020177320A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111009886A (en) * | 2019-11-20 | 2020-04-14 | 金诗瑶 | Remote-set power protection method and device |
| WO2020177320A1 (en) * | 2019-03-05 | 2020-09-10 | 金诗瑶 | Remote differential protection device |
| CN113937723A (en) * | 2020-07-14 | 2022-01-14 | 南京南瑞继保工程技术有限公司 | Relay protection system suitable for contain series reactor circuit |
| CN117294005A (en) * | 2023-09-13 | 2023-12-26 | 国网江苏省电力有限公司淮安供电分公司 | Protection operation mode defense early warning system and method for transformer substation line and transformer |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112965005B (en) * | 2021-02-04 | 2023-06-27 | 西安热工研究院有限公司 | System and method for verifying differential protection polarity by using dummy load |
| CN114113821B (en) * | 2021-09-30 | 2024-02-27 | 华能太仓发电有限责任公司 | Wiring identification method for incoming line current transformer of bus differential protection device |
| CN114218727A (en) * | 2021-12-15 | 2022-03-22 | 国家电网有限公司 | Power distribution network frame planning and multi-module intelligent terminal configuration joint optimization method |
| CN115825655B (en) * | 2023-02-20 | 2023-06-16 | 国网山东省电力公司乳山市供电公司 | Distribution network single-phase grounding fault rapid monitoring and positioning system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014054063A (en) * | 2012-09-06 | 2014-03-20 | Toshiba Corp | Current differential relay system and current differential relay |
| CN104393567B (en) * | 2014-11-20 | 2017-08-29 | 许继集团有限公司 | A kind of distribution transformer differential protecting method |
| CN106059085B (en) * | 2016-07-08 | 2018-10-16 | 国网山东省电力公司德州供电公司 | A kind of the Wide Area Power stratification protection and control system |
| CN108963994B (en) * | 2018-08-13 | 2020-05-26 | 三峡大学 | Accelerated remote backup protection method for optical fiber channel of power transmission line |
| CN209358242U (en) * | 2019-03-05 | 2019-09-06 | 金平 | A kind of long-range differential protection |
-
2019
- 2019-03-05 CN CN201920277054.0U patent/CN209358242U/en active Active
- 2019-10-09 DE DE112019003016.7T patent/DE112019003016T5/en active Pending
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020177320A1 (en) * | 2019-03-05 | 2020-09-10 | 金诗瑶 | Remote differential protection device |
| CN111009886A (en) * | 2019-11-20 | 2020-04-14 | 金诗瑶 | Remote-set power protection method and device |
| CN113937723A (en) * | 2020-07-14 | 2022-01-14 | 南京南瑞继保工程技术有限公司 | Relay protection system suitable for contain series reactor circuit |
| CN113937723B (en) * | 2020-07-14 | 2024-01-02 | 南京南瑞继保工程技术有限公司 | Relay protection system suitable for contain series reactor circuit |
| CN117294005A (en) * | 2023-09-13 | 2023-12-26 | 国网江苏省电力有限公司淮安供电分公司 | Protection operation mode defense early warning system and method for transformer substation line and transformer |
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| DE112019003016T5 (en) | 2021-03-18 |
| WO2020177320A1 (en) | 2020-09-10 |
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