CN2354285Y

CN2354285Y - Directional bus protector

Info

Publication number: CN2354285Y
Application number: CN 98242748
Authority: CN
Inventors: 郭效军
Original assignee: Nanjing Electric Power Automatized Apparatus General Factory National Electric
Current assignee: Nanjing Electric Power Automatized Apparatus General Factory National Electric
Priority date: 1998-11-25
Filing date: 1998-11-25
Publication date: 1999-12-15
Anticipated expiration: 2008-11-25

Abstract

The utility model relates to a bus protector. The utility model is composed of a plurality of direction distinguishing circuits and logic distinguishing circuits, and a plurality of tripping outlet circuits; the input of each direction distinguishing circuit is respectively and correspondingly connected with the output of each circuit and/or a current transformer of a bus of a substation, and the input of each direction distinguishing circuit is connected with the output of a voltage transformer on the bus of the substation; the output of each direction distinguishing circuit is connected with the input of the logic distinguishing circuits, the output of the logic distinguishing circuits is connected with the input of each corresponding tripping outlet circuit, and the output of each tripping outlet circuit is respectively connected with a circuit breaker of each circuit and/or the transformer on the bus of the substation.

Description

Direction formula protection equipment for busbar

The utility model relates to and a kind ofly is used for when substation bus bar is short-circuited fault disconnecting fast and the protection equipment for busbar of associated circuit of this bus or transformer switch.

Existing protection equipment for busbar has multiple; but many at present is representative with advanced microcomputer type protection equipment for busbar; this protection equipment for busbar is made up of power pack, sampler, arithmetic processor, trip(ping) circuit usually; its working method is to introduce protection equipment for busbar through current transformer (CT) with the electric current of associated circuit of this bus and transformer, and each road electric current that device will be introduced is by the phase addition.When the bus fault-free, each phase and electric current are zero; When bus broke down, whether fault phase and electric current were non-vanishing, differentiate bus thus and break down.The advantage of this method is that principle is simple, and is reliable.But there is following shortcoming in it:

1, when current transformer is saturated, can produce and electric current, cause error action of device, so the time device need locking, cause the time-delay of excision fault.

2, secondary connection complexity in the transformer station, cable is many, and design is complicated.

3, along with the development of the automation of transformation substations, the secondary device APPLICATION OF A DISTRIBUTED SYSTEM becomes trend.When above-mentioned principle is used for distributed system, solve relatively difficulty of sample-synchronous, realize that difficulty is bigger.

4, resource can not be shared, and cost is higher.

The purpose of this utility model is exactly in order to address the above problem, and a kind of resource-sharing is provided, and cost is low and secondary connection is simple, the direction formula protection equipment for busbar of dependable performance.

Technical solution of the present utility model:

A kind of direction formula protection equipment for busbar; it is characterized in that it is by a plurality of directional interpreting circuits; logic distinguishing circuit and a plurality of tripping operation outlet circuit are formed; the input of all directions judging circuit respectively with substation bus bar on each circuit with (or) corresponding linking to each other of output of the current transformer of transformer; all link to each other simultaneously with the output of voltage transformer on the substation bus bar; the output of all directions judging circuit all links to each other with the input of logic distinguishing circuit; with with each circuit on the bus and (or) the fault component direction signal of transformer sends into logic distinguishing circuit; the input of corresponding with each the respectively tripping operation outlet of the output of logic distinguishing circuit circuit links to each other; the output of each tripping operation outlet circuit respectively with substation bus bar on each circuit with (or) circuit breaker of transformer links to each other; make when bus breaks down, each tripping operation outlet circuit all according to the instruction of logic distinguishing circuit with each circuit and (or) breaker open operation on the transformer.

The direction of the circuit that the utility model employing is differentiated and substation bus bar is got in touch and the electric fault component of transformer is differentiated the fault of bus.When bus broke down, the direction of the electric fault component of each circuit and transformer was pointed to bus; When external area errors such as generation circuit or transformer, the direction of the electric fault component of faulty line or failure transformer is pointed to the fault point, promptly deviates from bus.Whether can distinguish thus is the substation bus bar fault.

Advantage of the present utility model is:

1, be particularly suitable for the secondary device distributed system, the sampling of each distribution unit does not need synchronously, and the device simplicity of design realizes easily.

2, be not subjected to the saturated influence of current transformer, reliable working performance.

3, design of secondary wiring is simple.When multiplexing, sharing hardware resource with circuit and tranformer protection, do not need special-purpose bus protection current transformer and corresponding cable, reduce investment, reduce cost.

The utility model is described in further detail below with reference to accompanying drawing.

Fig. 1 is a theory diagram of the present utility model.

Fig. 2 is an electrical schematic diagram of the present utility model.

As Fig. 1, the utility model is made up of a plurality of directional interpreting circuits 1, logic distinguishing circuit 2 and a plurality of tripping operation outlet circuit 3, the input of all directions judging circuit 1 respectively with substation bus bar 4 on each circuit 5 with (or) (model can be LCWD for the current transformer 7 of transformer 6 ₂-110) output is corresponding to link to each other, simultaneously all with substation bus bar 4 on voltage transformer 8 (model can be JCC _1M-110) output links to each other; the output of all directions judging circuit 1 all links to each other with the input of logic distinguishing circuit 2; it with each circuit on the bus 45 and (or) the fault component direction signal of transformer 6 sends into logic distinguishing circuit 2; the input of corresponding with each the respectively tripping operation outlet of the output of logic distinguishing circuit 2 circuit 3 links to each other; the output of each tripping operation outlet circuit 3 respectively with substation bus bar 4 on each circuit 5 with (or) circuit breaker 9 (model can be SW4-110) of transformer 6 links to each other; make when bus 4 breaks down; each tripping operation outlet circuit 3 all according to the instruction of logic distinguishing circuit 2 with each circuit 5 with (or) circuit breaker 9 separating brakes on the transformer 6, reach the purpose of bus protection.

As Fig. 2, directional interpreting circuit 1 of the present utility model can be made up of A/D converter (model can be AD574) and Single Chip Microcomputer (SCM) system, wherein Single Chip Microcomputer (SCM) system is made of central processor CPU 1 (model can be 68332), memory under program IC1-1 (model can be 27256), data memory IC1-2 (model can be 62256), Single Chip Microcomputer (SCM) system also can adopt the industrial control microcomputer system to realize, data memory wherein also can include erasable electric rewrite data memory or the flash memory of removing, so that revise setting value and data record.The input of A/D converter links to each other with bus-bar potential transformer 8 by the current transformer 7 of corresponding line 5 on power pack LH and voltage changer YH and the substation bus bar 4 or transformer 6 respectively, the data output of A/D converter connects the data input pin of central processor CPU 1 in the Single Chip Microcomputer (SCM) system, and the output of Single Chip Microcomputer (SCM) system links to each other with the input of logic distinguishing circuit 2 by interface circuit IC1-3.

Logic distinguishing circuit 2 can be exactly a Single Chip Microcomputer (SCM) system or industrial control microcomputer system, it can be made of central processor CPU 2, memory under program IC2-1, data memory IC2-2 (model all can be identical with aforementioned corresponding device model), just by corresponding the linking to each other of output of the Single Chip Microcomputer (SCM) system in interface circuit IC2-3 and all directions judging circuit 1, the output of CPU2 just exports circuit 3 with each tripping operation respectively and links to each other the input of CPU2.

Tripping operation outlet circuit 3 can be made up of photoelectrical coupler G1 and relay J, the input of photoelectrical coupler G1 is continuous by the corresponding output of Single Chip Microcomputer (SCM) system CPU2 in interface circuit IC2-4 and the logic distinguishing circuit 2, its output links to each other with relay J line bag, the output of relay J is drawn from its normally opened contact Ja, and this normally opened contact Ja just is serially connected on the control box of circuit breaker 9 of corresponding line 5 on the substation bus bar 4 or transformer 6.

Operation principle of the present utility model is as follows:

The circuit 5 that all directions judging circuit 1 of the present utility model links with protected bus 4 respectively and (or) voltage transformer 8 on the transformer 6 bus bar side current transformers 7, this bus 4 links to each other, and is used to introduce the electric fault component signal of above-mentioned each circuit 5 or transformer 6 bus bar side.When electric power system does not have short trouble, all directions judging circuit 1 receive for perfecting electric current, voltage signal, no electric fault component signal, at this moment, all directions judging circuit 1 no-output is differentiated through logic distinguishing circuit 2, makes the relay J of each tripping operation outlet circuit 3 be failure to actuate.When electric power system is short-circuited fault, all directions judging circuit 1 receives is the electric current of fault component, voltage signal, then all directions judging circuit 1 with the electric fault component extraction after, in house software through its Single Chip Microcomputer (SCM) system CPU1 is handled, can determine the direction of electric fault, and direction signal passed to logic distinguishing circuit 2, differentiate the direction signal of all directions judging circuit 1 when logic distinguishing circuit 2, be when pointing to substation bus bar 4, then being judged to be bus 4 breaks down, and the permission signal that will trip passes to all tripping operations that link to each other with this bus 4 outlet circuit 3, make the relay J action of each tripping operation outlet circuit 3, the normally opened contact Ja closure of each relay J then, thus the excision fault will be disconnected with each circuit 5 and circuit breaker 9 separating brakes on the transformer 6 that bus 4 is got in touch.When the direction signal of logic distinguishing circuit 2 differentiation all directions judging circuits 1, when having at least one the tunnel to point to circuit 5 (or transformer 6), then being judged to be is the bus external area error, does not drive each tripping operation this moment and exports circuit 3.So when being short-circuited fault on the bus 4, this protection equipment for busbar can correct operation, the excision fault.When circuit 5 (or transformer 6) when being short-circuited fault, this protection equipment for busbar can correct decision and be failure to actuate, and guarantees that electric power system normally moves.

When substation bus bar is double-bus, can insert each circuit and transformer disconnecting link position signalling the quantity of state input of each corresponding directional interpreting circuit this moment, correspondingly, Single Chip Microcomputer (SCM) system CPU1 input is drawn a quantity of state input (see figure 2) by photoelectrical coupler G2 again in all directions judging circuit, be used to distinguish the circuit and the transformer that link to each other with each bus, guarantee when arbitrary bus breaks down, have only the circuit that links to each other with this fault bus and the circuit breaker of transformer to be cut off, and circuit that links to each other with normal bus and transformer can normally move.

For can shared resource and design convenient, the utility model in actual applications, its all directions judging circuit 1 can be made in the casing with each self-corresponding tripping operation outlet circuit 3.Correspondingly the interface circuit that connects with directional interpreting circuit 1 and tripping operation outlet circuit 3 respectively in the logic distinguishing circuit 2 can adopt the bidirectional interface circuit, and similarly directional interpreting circuit 1 also adopts the bidirectional interface circuit with the interface circuit of tripping operation outlet circuit 3.At this moment, the signal transmission is the two-way signaling transmission, and the signal transmission can be adopted communication mode.Its operation principle as hereinbefore.

Claims

1; a kind of direction formula protection equipment for busbar; it is characterized in that it is by a plurality of directional interpreting circuits; logic distinguishing circuit and a plurality of tripping operation outlet circuit are formed; the input of all directions judging circuit respectively with substation bus bar on each circuit with (or) corresponding linking to each other of output of the current transformer of transformer; all link to each other simultaneously with the output of voltage transformer on the substation bus bar; the output of all directions judging circuit all links to each other with the input of logic distinguishing circuit; with with each circuit on the bus and (or) the fault component direction signal of transformer sends into logic distinguishing circuit; the input of corresponding with each the respectively tripping operation outlet of the output of logic distinguishing circuit circuit links to each other; the output of each tripping operation outlet circuit respectively with substation bus bar on each circuit with (or) circuit breaker of transformer links to each other; make when bus breaks down, each tripping operation outlet circuit all according to the instruction of logic distinguishing circuit with each circuit and (or) breaker open operation on the transformer.

2; direction formula protection equipment for busbar as claimed in claim 1; it is characterized in that described directional interpreting circuit can be made up of A/D converter and Single Chip Microcomputer (SCM) system; wherein Single Chip Microcomputer (SCM) system is by central processor CPU 1; memory under program IC1-1; data memory IC1-2 constitutes; the input of A/D converter links to each other with bus-bar potential transformer by the current transformer of corresponding line on power pack LH and voltage changer YH and the substation bus bar or transformer respectively; the data output of A/D converter connects the data input pin of central processor CPU 1 in the Single Chip Microcomputer (SCM) system, and the output of Single Chip Microcomputer (SCM) system links to each other with the input of logic distinguishing circuit by interface circuit IC1-3.

3, direction formula protection equipment for busbar as claimed in claim 2; it is characterized in that the Single Chip Microcomputer (SCM) system in the described directional interpreting circuit also can adopt the industrial control microcomputer system to realize; data memory wherein also can include erasable electric rewrite data memory or the flash memory of removing, so that revise setting value and data record.

4, direction formula protection equipment for busbar as claimed in claim 1; it is characterized in that described logic distinguishing circuit can be exactly a Single Chip Microcomputer (SCM) system or industrial control microcomputer system; it can be made of central processor CPU 2, memory under program IC2-1, data memory IC2-2; just by corresponding the linking to each other of output of the Single Chip Microcomputer (SCM) system in interface circuit IC2-3 and all directions judging circuit, the output of CPU2 just exports circuit with each tripping operation respectively and links to each other the input of CPU2.

5, direction formula protection equipment for busbar as claimed in claim 1; it is characterized in that described tripping operation exports circuit and can be made up of photoelectrical coupler G1 and relay J; the input of photoelectrical coupler G1 is continuous by the corresponding output of Single Chip Microcomputer (SCM) system CPU2 in interface circuit IC2-4 and the logic distinguishing circuit; its output links to each other with relay J line bag; the output of relay J is drawn from its normally opened contact Ja, and this normally opened contact Ja just is serially connected on the control box of circuit breaker of corresponding line on the substation bus bar or transformer.

6, direction formula protection equipment for busbar as claimed in claim 1; it is characterized in that when substation bus bar is double-bus; each circuit and transformer disconnecting link position signalling can be inserted the quantity of state input of each corresponding directional interpreting circuit; correspondingly; Single Chip Microcomputer (SCM) system CPU1 input is drawn a quantity of state input by photoelectrical coupler G2 again in all directions judging circuit, is used to distinguish the circuit and the transformer that link to each other with each bus.