CN216412987U - Three-phase inconsistent loop and circuit breaker - Google Patents
Three-phase inconsistent loop and circuit breaker Download PDFInfo
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- CN216412987U CN216412987U CN202122320180.XU CN202122320180U CN216412987U CN 216412987 U CN216412987 U CN 216412987U CN 202122320180 U CN202122320180 U CN 202122320180U CN 216412987 U CN216412987 U CN 216412987U
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Abstract
The utility model provides a three-phase inconsistent loop and a breaker, and belongs to the technical field of breaker detection. When the existing circuit breaker verifies the opening performance phase by phase, if an opening command is sent to one phase opening loop, the opening loops of other phases can act simultaneously. According to the utility model, the pressing plate is arranged between the coil of the three-phase inconsistent delay relay and the negative electrode of the main control power supply, so that the auxiliary contact of the three-phase inconsistent protection relay is effectively prevented from being closed to form a short circuit at the outlet wire side of the outlet pressing plate, and therefore, a repeated opening and closing command of the non-operation phase circuit breaker is generated, the single-phase opening performance of the circuit breaker is favorably verified, the contact of the circuit breaker is protected, and the maintenance cost is reduced. Meanwhile, when the pressing plate is disconnected, the three-phase inconsistent delay relay does not act, the background does not give an alarm, and an alarm signal does not need to be processed.
Description
Technical Field
The utility model relates to a three-phase inconsistent loop and a circuit breaker, and belongs to the technical field of circuit breaker detection.
Background
In power grids of 220kV and beyond 220kV voltage class, GIS commonly employ phase-splitting operated circuit breakers. In the normal working process of a three-phase power system, due to factors such as equipment quality, manual operation and the like, the system is inevitably in an abnormal operation state with inconsistent phase splitting states of a three-phase circuit breaker, negative sequence and zero sequence components in the system can have great influence on primary equipment, particularly non-resistive electrical equipment, and can cause other protection misoperation to cause override tripping, enlarge accidents and seriously affect the safety and the stability of the system. Therefore, the circuit breaker is generally provided with a non-full-phase protection circuit capable of reflecting the non-full-phase operation state of the circuit breaker, and the circuit breaker acts on the circuit breaker in the abnormal operation state.
In practical application, most 220kV and above voltage level power grids are provided with circuit breaker three-phase inconsistent protection. However, a typical three-phase inconsistent protection outlet circuit of the circuit breaker only has one outlet pressing plate, and even if the pressing plate is withdrawn and a certain phase of the circuit breaker is disconnected, the auxiliary contact of the protection relay in the three-phase inconsistent protection circuit still forms a short circuit on the outlet pressing plate outgoing line side. When another phase circuit breaker sends the opening command next, the outlet pressing plate outlet side short circuit can cause the residual phase circuit breaker to trip at the same time, the difficulty of verifying the single-phase opening performance of the circuit breaker is increased, and the repeated opening and closing command has certain influence on the service life of the circuit breaker contact.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a three-phase inconsistent circuit and a breaker, which are used for solving the problem that the opening performance of the breaker is difficult to verify phase by phase.
In order to achieve the purpose, the utility model provides a three-phase inconsistent circuit, which comprises a three-phase inconsistent main circuit and an outlet circuit used for connecting each phase of opening circuit of a split-phase circuit breaker, wherein the three-phase inconsistent main circuit comprises a positive terminal used for connecting a positive electrode of a main control power supply and a negative terminal used for connecting a negative electrode of the main control power supply, and also comprises each phase of auxiliary normally-closed contact corresponding to each phase of main contact of the split-phase circuit breaker, one end of each phase of auxiliary normally-closed contact is connected with the positive terminal after being connected in parallel, and the other end of each phase of auxiliary normally-closed contact is connected with the negative terminal through a delay protection circuit; the time delay protection circuit comprises a time delay circuit and a protection circuit which are mutually connected in parallel, the time delay circuit comprises coils of three-phase inconsistent time delay relays and a first pressing plate which are connected in series, and the protection circuit comprises coils of three-phase inconsistent protection relays and normally open contacts of the three-phase inconsistent time delay relays which are connected in series;
the export return circuit includes the three-phase protection normally open contact of the inconsistent protection relay of three-phase, one side of three-phase protection normally open contact corresponds and connects each looks separating brake circuit of phase splitting circuit breaker, forms the common port after the other side interconnect, the parallel branch road at each looks supplementary normally closed contact place in the inconsistent main circuit of three-phase is connected respectively to the common port.
According to the utility model, the pressing plate is arranged between the coil of the three-phase inconsistent delay relay and the negative electrode of the main control power supply, so that the auxiliary contact of the three-phase inconsistent protection relay is effectively prevented from being closed to form a short circuit at the outlet wire side of the outlet pressing plate, and therefore, a repeated opening and closing command of the non-operation phase circuit breaker is generated, the single-phase opening performance of the circuit breaker is favorably verified, the contact of the circuit breaker is protected, and the maintenance cost is reduced.
Furthermore, in the above-mentioned circuit, the three-phase inconsistent main circuit further includes each phase auxiliary normally open contact corresponding to each phase main contact of the split-phase circuit breaker, one end of each phase auxiliary normally open contact is connected with the same phase auxiliary normally closed contact, and the other end is connected with the delay protection circuit; and the public end is respectively connected with one side of each phase of auxiliary normally closed contact close to the auxiliary normally open contact in the three-phase inconsistent main circuit.
An auxiliary normally open contact is arranged between each auxiliary normally closed contact and the time delay protection circuit, and current can reach the time delay protection circuit only through the auxiliary normally closed contact, so that the safety performance of the split-phase circuit breaker in actual operation is enhanced.
Further, in the above-mentioned return circuit, the outlet circuit also includes a second pressure plate, one end of the second pressure plate is connected with the common end, and the other end is respectively connected with one side of each phase of auxiliary normally closed contacts close to the auxiliary normally open contacts in the three-phase inconsistent main circuit.
Further, in the above-mentioned return circuit, the export return circuit still includes the third clamp plate, and three-phase protection normally open contact connects mutually behind the third clamp plate that corresponds in series and forms the common port.
And the three pressing plates are independently arranged in the outlet loop, so that the second pressing plate is prevented from being failed or the three inconsistent delay relays are prevented from misoperation.
The utility model also provides a circuit breaker, which comprises a three-phase inconsistent main circuit and an outlet circuit used for connecting each phase opening circuit of the phase-splitting circuit breaker, wherein the three-phase inconsistent main circuit comprises a positive terminal used for connecting the positive pole of a main control power supply and a negative terminal used for connecting the negative pole of the main control power supply, and also comprises each phase auxiliary normally closed contact corresponding to each phase main contact of the phase-splitting circuit breaker, one end of each phase auxiliary normally closed contact is connected with the positive terminal after being connected in parallel, and the other end of each phase auxiliary normally closed contact is connected with the negative terminal through a time-delay protection circuit; the time delay protection circuit comprises a time delay circuit and a protection circuit which are mutually connected in parallel, the time delay circuit comprises coils of three-phase inconsistent time delay relays and a first pressing plate which are connected in series, and the protection circuit comprises coils of three-phase inconsistent protection relays and normally open contacts of the three-phase inconsistent time delay relays which are connected in series;
the export return circuit includes the three-phase protection normally open contact of the inconsistent protection relay of three-phase, one side of three-phase protection normally open contact corresponds and connects each looks separating brake circuit of phase splitting circuit breaker, forms the common port after the other side interconnect, the parallel branch road at each looks supplementary normally closed contact place in the inconsistent main circuit of three-phase is connected respectively to the common port.
Further, in the above circuit breaker, the three-phase inconsistent main circuit further includes each phase auxiliary normally open contact corresponding to each phase main contact of the split-phase circuit breaker, one end of each phase auxiliary normally open contact is connected to the same phase auxiliary normally closed contact, and the other end is connected to the delay protection circuit; and the public end is respectively connected with one side of each phase of auxiliary normally closed contact close to the auxiliary normally open contact in the three-phase inconsistent main circuit.
Further, in the circuit breaker, the outlet loop further comprises a second pressing plate, one end of the second pressing plate is connected with the public end, and the other end of the second pressing plate is connected with one side, close to the auxiliary normally-open contact, of each phase of auxiliary normally-closed contact in the three-phase inconsistent main loop respectively.
Further, in the circuit breaker, the outlet loop further includes a third pressing plate, and the three-phase protection normally open contacts are connected in series with the corresponding third pressing plate and then connected with each other to form a common end.
Drawings
FIG. 1 is a schematic diagram of a three-phase non-uniform circuit in the prior art;
FIG. 2 is a schematic diagram of a three-phase non-uniform outlet circuit in embodiment 1 of the three-phase non-uniform circuit of the present invention;
fig. 3 is a schematic diagram of a three-phase non-uniform outlet circuit in embodiment 2 of the three-phase non-uniform circuit of the present invention.
In the figure: 47T: three-phase inconsistent delay relay, 47X: three-phase inconsistent protection relays, LP1, LP2, LP 3: and (7) pressing a plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.
In an outlet loop in a three-phase inconsistent loop of the conventional split-phase circuit breaker, even if the pressing plate is withdrawn, after a certain phase of the circuit breaker is disconnected, an auxiliary contact of a three-phase inconsistent protection relay still forms a short circuit at the wire outlet side of the outlet pressing plate, and when a brake-separating command is sent to another phase of the brake-separating loop, the short circuit at the wire outlet side of the outlet pressing plate can cause the remaining phase of the brake-separating loop to receive the brake-separating command at the same time for brake-separating.
Specifically, as shown in fig. 1, the phase-splitting circuit breaker includes a tripping circuit and a three-phase inconsistent circuit. The separating brake loop comprises an A-phase separating brake loop, a B-phase separating brake loop and a C-phase separating brake loop, and each separating brake loop is connected with the three-phase inconsistent loop through an outlet loop.
The three-phase inconsistent circuit comprises a three-phase inconsistent main circuit and an outlet circuit. The three-phase inconsistent main circuit comprises an A-phase normally closed contact and an A-phase normally open contact corresponding to the A-phase separating brake circuit, a B-phase normally closed contact and a B-phase normally open contact corresponding to the B-phase separating brake circuit, and a C-phase normally closed contact and a C-phase normally open contact corresponding to the C-phase separating brake circuit. The three-phase inconsistent main circuit further comprises a delay protection circuit, the delay protection circuit comprises a delay circuit and a protection circuit which are connected in parallel, the delay circuit comprises three coils of inconsistent delay relays 47T, and the protection circuit comprises three normally open contacts of the inconsistent delay relays 47T and three coils of three-phase inconsistent protection relays 47X which are connected in series. The coils of the three inconsistent delay relays 47T and the coils of the three inconsistent protection relays 47X are both connected with the negative end of the main control power supply.
The outlet loop comprises auxiliary contacts 13-14, 23-24 and 33-34 of a three-phase inconsistency protection relay 47X and a pressure plate LP1, wherein all the auxiliary contacts are connected to form a common end, the common end is connected with one end of a pressure plate LPI, and the other end of the pressure plate LP1 is respectively connected with all the phase normally closed contacts of the corresponding split-phase circuit breakers in the three-phase inconsistency loop.
The pressing plate LP1 is connected with the A-phase normally closed contact and the A-phase normally open contact at the same time, is also connected with the B-phase normally closed contact and the B-phase normally open contact at the same time, and is also connected with the C-phase normally closed contact and the C-phase normally open contact at the same time. The A-phase normally closed contact, the B-phase normally closed contact and the C-phase normally closed contact are connected with the positive end of the master control power supply, and the A-phase normally open contact, the B-phase normally open contact and the C-phase normally open contact are connected with the time delay protection circuit.
When the existing split-phase circuit breaker verifies the opening performance phase by phase, in order to prevent the three-phase opening loop of the split-phase circuit breaker from being opened simultaneously caused by the action of the three-phase inconsistent protection loop, the pressing plate LP1 is disconnected. At the moment, an A-phase opening command is given to the phase-separating circuit breaker to test the opening performance of the A-phase opening loop, the A-phase normally closed contact is opened, the A-phase normally open contact is closed, the B-phase and C-phase normally closed contacts are closed, the B-phase and C-phase normally open contacts are opened, current flows out from the positive terminal of the main control power supply, reaches the coils of the three inconsistent delay relays 47T through the B-phase normally closed contact or the C-phase normally closed auxiliary contact and the closed A-phase normally open contact, is electrified, the normally open contacts of the three inconsistent delay relays 47T are closed, the coils of the three inconsistent protection relays 47X are electrified, and the contacts 13-14 and 23-24 of the three inconsistent normally open relays 47X are closed, 33-34, the phase separating brake loops of the phase separating circuit breaker form a common end at the normally open contact pins 14, 24 and 34 of the three-phase protective relay 47X.
If the opening performance of the phase-B opening circuit is verified at this time, an opening command (opening current) needs to be provided for the phase-B opening circuit, the phase-B opening current passes through the normally open contacts 23-24 of the three inconsistent protection relays 47X and reaches the public end, and then passes through the normally open contacts 33-34 of the three inconsistent protection relays 47X and reaches the phase-C opening circuit, so that the phase-C opening circuit is powered on, and the phase-B opening circuit and the phase-C opening circuit are opened at the same time.
However, when the opening performance of the split-phase circuit breaker is verified phase by phase, it is required to ensure that the actions of the a-phase, B-phase and C-phase opening circuits are independent and do not affect each other, and when a command for opening the B-phase opening circuit is given, the C-phase opening circuit should not trip.
Three-phase inconsistent loop example 1:
in order to meet the requirement of verifying the opening performance of the circuit breaker on site phase by phase, reduce the opening and closing times of contacts of the circuit breaker and prolong the service life, in the embodiment, a pressing plate LP2 is additionally arranged on a circuit connecting a coil of the three-phase inconsistent delay relay 47T and the negative end of the main control power supply.
As shown in fig. 2, the delay protection circuit of the three-phase inconsistent circuit in this embodiment includes a delay circuit and a protection circuit connected in parallel, the delay circuit includes three coils of the inconsistent delay relay 47T and a pressure plate LP2, and the protection circuit includes three normally open contacts of the inconsistent delay relay 47T and a coil of the three-phase inconsistent protection relay 47X connected in series. The coil of the pressure plate LP2 and the coil of the three-phase inconsistency protective relay 47X are both connected with the negative end of the main control power supply.
In the embodiment, the setting value of the three-phase inconsistent delay relay 47T is 0.5s, and the setting range is 0.1 s-10 h.
When the brake separating performance of the split-phase circuit breaker needs to be verified phase by phase, the pressure plates LP1 and LP2 are simultaneously opened. At this time, an A-phase opening command is given to the phase-splitting circuit breaker to test the opening performance of the A-phase opening loop, the A-phase normally closed contact is opened, the A-phase normally open contact is closed, the B-phase and C-phase normally closed contacts are closed, the B-phase and C-phase normally open contacts are opened, current flows out from the positive end of the main control power supply and cannot pass through the coil of the three-phase inconsistent delay relay 47T, so that the normally open contact cannot be closed, the coil of the three-phase inconsistent protection relay 47X cannot be electrified, auxiliary contacts (13-14, 23-24 and 33-34 of 47X in fig. 2) of the three-phase inconsistent protection relay 47X cannot be closed, and common ends cannot be formed at the normally open contact pins 14, 24 and 34 of the three-phase protection relay 47X by each phase-phase opening loop of the phase-splitting circuit breaker.
If a switching-off command is sent to the B-phase switching-off loop at the moment, the B-phase switching-off current does not enter the C-phase switching-off loop through the public end through the normally open contacts 23-24 of the three inconsistent protection relays 47X, so that the B-phase switching-off loop and the C-phase switching-off loop trip out simultaneously, and the independent testing of the switching-off performance of the B-phase switching-off loop can be realized.
Three-phase inconsistent loop example 2:
it differs from example 1 in that: as shown in fig. 3, a pressure plate LP3 is provided on a line where the pressure plate LP1 is connected to the auxiliary contacts (14, 24, 34 of 47X in fig. 3) of the three-phase inconsistency protection relay 47X. When the circuit breaker opening performance needs to be verified phase by phase, the pressure plates LP1, LP2 and LP3 are opened simultaneously. When the pressing plate LP2 breaks down, the auxiliary contact pins 14, 24 and 34 of the three-phase inconsistent protection relay 47X are prevented from being short-circuited by the 3 pressing plates LP3 which are arranged in an exiting mode, and reliability of phase-by-phase verification breaker opening performance is enhanced.
The embodiment of the circuit breaker comprises:
the circuit breaker of this embodiment adopts the three-phase inconsistent circuit described in embodiment 1 or embodiment 2 of the three-phase inconsistent circuit, and it is clear that the specific structure of this circuit has been described in the above embodiments, and details are not described here.
Claims (8)
1. A three-phase inconsistent circuit is characterized by comprising a three-phase inconsistent main circuit and an outlet circuit used for connecting each phase opening circuit of a phase-opening circuit breaker, wherein the three-phase inconsistent main circuit comprises a positive terminal used for connecting a positive pole of a main control power supply and a negative terminal used for connecting a negative pole of the main control power supply, and also comprises each phase auxiliary normally closed contact corresponding to each phase main contact of the phase-opening circuit breaker, one end of each phase auxiliary normally closed contact is connected with the positive terminal after being connected in parallel, and the other end of each phase auxiliary normally closed contact is connected with the negative terminal through a time delay protection circuit; the time delay protection circuit comprises a time delay circuit and a protection circuit which are mutually connected in parallel, the time delay circuit comprises coils of three-phase inconsistent time delay relays and a first pressing plate which are connected in series, and the protection circuit comprises coils of three-phase inconsistent protection relays and normally open contacts of the three-phase inconsistent time delay relays which are connected in series;
the export return circuit includes the three-phase protection normally open contact of the inconsistent protection relay of three-phase, one side of three-phase protection normally open contact corresponds and connects each looks separating brake circuit of phase splitting circuit breaker, forms the common port after the other side interconnect, the parallel branch road at each looks supplementary normally closed contact place in the inconsistent main circuit of three-phase is connected respectively to the common port.
2. The three-phase inconsistent circuit of claim 1, wherein the three-phase inconsistent main circuit further comprises auxiliary normally open contacts of each phase corresponding to the main contacts of each phase of the split-phase circuit breaker, one end of each auxiliary normally open contact of each phase is connected with the auxiliary normally closed contact of the same phase, and the other end of each auxiliary normally open contact of each phase is connected with the time-delay protection circuit; and the public end is respectively connected with one side of each phase of auxiliary normally closed contact close to the auxiliary normally open contact in the three-phase inconsistent main circuit.
3. The three-phase inconsistent circuit of claim 2, wherein the outlet circuit further comprises a second pressure plate, one end of the second pressure plate is connected with the common end, and the other end of the second pressure plate is respectively connected with one side of each phase of auxiliary normally-closed contact in the three-phase inconsistent main circuit, which is close to the auxiliary normally-open contact.
4. The three-phase inconsistent circuit of claim 3, wherein the outlet circuit further comprises a third pressure plate, and the three-phase protection normally open contacts are connected in series with the corresponding third pressure plate to form a common terminal.
5. A circuit breaker is characterized by comprising a three-phase inconsistent main circuit and an outlet circuit used for connecting each phase opening circuit of the split-phase circuit breaker, wherein the three-phase inconsistent main circuit comprises a positive terminal used for connecting a positive pole of a main control power supply and a negative terminal used for connecting a negative pole of the main control power supply, and also comprises each phase auxiliary normally closed contact corresponding to each phase main contact of the split-phase circuit breaker, one end of each phase auxiliary normally closed contact is connected with the positive terminal after being connected in parallel, and the other end of each phase auxiliary normally closed contact is connected with the negative terminal through a time delay protection circuit; the time delay protection circuit comprises a time delay circuit and a protection circuit which are mutually connected in parallel, the time delay circuit comprises coils of three-phase inconsistent time delay relays and a first pressing plate which are connected in series, and the protection circuit comprises coils of three-phase inconsistent protection relays and normally open contacts of the three-phase inconsistent time delay relays which are connected in series;
the export return circuit includes the three-phase protection normally open contact of the inconsistent protection relay of three-phase, one side of three-phase protection normally open contact corresponds and connects each looks separating brake circuit of phase splitting circuit breaker, forms the common port after the other side interconnect, the parallel branch road at each looks supplementary normally closed contact place in the inconsistent main circuit of three-phase is connected respectively to the common port.
6. The circuit breaker of claim 5, wherein the three-phase inconsistent main circuit further comprises auxiliary normally open contacts of each phase corresponding to the main contacts of each phase of the split-phase circuit breaker, one end of each auxiliary normally open contact of each phase is connected with the auxiliary normally closed contact of the same phase, and the other end of each auxiliary normally open contact of each phase is connected with the delay protection circuit; and the public end is respectively connected with one side of each phase of auxiliary normally closed contact close to the auxiliary normally open contact in the three-phase inconsistent main circuit.
7. The circuit breaker according to claim 6, characterized in that the outlet loop further comprises a second pressing plate, one end of the second pressing plate is connected with the common end, and the other end of the second pressing plate is respectively connected with one side of each phase of auxiliary normally closed contact close to the auxiliary normally open contact in the three-phase inconsistent main loop.
8. The circuit breaker of claim 7, wherein the outlet circuit further comprises a third pressing plate, and the three-phase protection normally open contacts are connected in series with the corresponding third pressing plate to form a common end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122320180.XU CN216412987U (en) | 2021-09-24 | 2021-09-24 | Three-phase inconsistent loop and circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122320180.XU CN216412987U (en) | 2021-09-24 | 2021-09-24 | Three-phase inconsistent loop and circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216412987U true CN216412987U (en) | 2022-04-29 |
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ID=81294065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122320180.XU Active CN216412987U (en) | 2021-09-24 | 2021-09-24 | Three-phase inconsistent loop and circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216412987U (en) |
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2021
- 2021-09-24 CN CN202122320180.XU patent/CN216412987U/en active Active
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