Timing and metering loop of GIS and circuit breaker control loop of GIS

Abstract

The invention relates to a GIS timing and metering loop and a GIS circuit breaker control loop, and belongs to the field of high-voltage switch product control. According to the timing and counting loop, a timing port of a first time relay and a counting port of a counter are connected in series with a normally open contact of an auxiliary switch of a circuit breaker; when the first time relay times to a first preset time length, the counter is reset; when the counter is full of preset times, the first time relay is reset; a main normally open contact of the counter is connected in series with a coil of the first intermediate relay; a normally open contact of the first intermediate relay is connected in series with a timing port of the second time relay, and a normally closed contact of the first intermediate relay is connected in series in a closing loop of the circuit breaker; a normally-closed contact of the second time relay is connected in series with a coil of the second intermediate relay and then connected in parallel with two ends of a timing port of the second intermediate relay; and a normally-open contact of the second intermediate relay is connected in parallel with the main normally-open contact. According to the invention, an automatic locking function can be realized when the circuit breaker is frequently switched on and switched off in a short time.

Description

Technical Field

[0001] The present invention relates to a timing and counting circuit of a GIS and a breaker control circuit of the GIS, belonging to the field of high-voltage switch product control. Background Art

[0002] Gas Insulated Switchgear (GIS), as an execution element for control and protection in a substation, is crucial for the safe and reliable operation of the power grid. And the breaker, as a key control device of the GIS, is responsible for interrupting the voltage in the power system when closing.

[0003] Figure 1 is a schematic structural diagram of a conventional closing circuit of a breaker in an existing GIS, as Figure 1 shown. This conventional closing circuit is a simplified closing circuit, including the normally closed contacts (21, 22) of the anti-tripping relay KFB, the first group of normally closed contacts (18, 20) of the auxiliary switch Q1 of the GIS breaker, the second group of normally closed contacts (22, 24) of the auxiliary switch Q1 of the GIS breaker, the closing circuit coil YC1, the normally closed contacts (7, 9) of the low oil pressure locking relay K6, and the normally closed contacts (2, 4) of the low gas pressure locking relay K7. The normally closed contacts (21, 22) of the anti-tripping relay KFB, the first group of normally closed contacts (18, 20) of the auxiliary switch Q1 of the GIS breaker, the second group of normally closed contacts (22, 24) of the auxiliary switch Q1 of the GIS breaker, the closing circuit coil YC1, the normally closed contacts (2, 4) of the low gas pressure locking relay K7, and the normally closed contacts (7, 9) of the low oil pressure locking relay K6 are sequentially connected in series on the line between the live wire L and the neutral wire N.

[0004] If the breaker is switched on and off frequently within a short time, it will cause excessive heat accumulation in the closing resistor of the breaker and result in a failure, which will have an adverse effect on the arc extinguishing of the breaker, leading to breaker explosion or other accidents. Summary of the Invention

[0005] The purpose of the present invention is to provide a timing and counting circuit of a GIS and a breaker control circuit of the GIS to solve the problem that the breaker in the existing GIS is switched on and off frequently within a short time.

[0006] To achieve the above purpose, the solution of the present invention includes: A timing and counting circuit for a GIS of the present invention includes a first time relay that starts timing when the timing port is turned on and controls the switching and resetting of its contact state until the first preset duration, a second time relay that starts timing when the timing port is turned on and controls the switching of its contact state until the second preset duration, and a counter that starts counting when the counting port is turned on and controls the switching and resetting of its contact state until the preset number of times is reached. The timing port of the first time relay and the counting port of the counter are used to be connected in series with the normally open contact of the auxiliary switch of the circuit breaker. When the first time relay times until the first preset duration, the counter is reset through its contacts. When the counter reaches the preset number of times, the first time relay is reset through its contacts. The main normally open contact of the counter is connected in series with the coil of the first intermediate relay; the first set of normally open contacts of the first intermediate relay is connected in series with the timing port of the second time relay, and the normally closed contact of the first intermediate relay is used to be connected in series in the closing circuit of the circuit breaker; the normally closed contact of the second time relay is connected in series with the coil of the second intermediate relay and then connected in parallel across the two ends of the timing port of the second time relay, and the second set of normally open contacts of the second intermediate relay is connected in parallel with the main normally open contact.

[0007] Further, it further includes a third intermediate relay; the coil of the third intermediate relay is connected in series with the first set of normally open contacts of the first time relay, and the first set of normally open contacts of the third intermediate relay is connected in series with the reset port of the first time relay, so that the first time relay is reset when timing reaches the first preset duration; the second set of normally open contacts of the third intermediate relay is connected in series with the reset port of the counter, so that the counter is reset when the first time relay times to the first preset duration.

[0008] Further, the third set of normally open contacts of the first intermediate relay is connected in series with the reset port of the counter, so that the counter is reset when reaching the preset number of times; the second set of normally open contacts of the first intermediate relay is connected in series with the reset port of the first time relay, so that the first time relay is reset when the counter reaches the preset number of times.

[0009] Further, the first set of normally open contacts of the second intermediate relay is connected in parallel across the two ends of the first set of normally open contacts of the first intermediate relay.

[0010] Further, the preset number of times is three times; the first preset duration is forty minutes; the second preset duration is three hours.

[0011] A circuit breaker control circuit for a GIS of the present invention includes the closing circuit of the circuit breaker and further includes a timing and counting circuit. Among them, the timing and counting circuit includes: a first time relay that starts timing when the timing port is turned on and controls the switching and reset of its contact state until the first preset duration; a second time relay that starts timing when the timing port is turned on and controls the switching of its contact state until the second preset duration; and a counter that starts counting when the counting port is turned on and controls the switching and reset of its contact state until the preset number of times is reached. The timing port of the first time relay and the counting port of the counter are used to be connected in series with the normally open contact of the auxiliary switch of the circuit breaker. When the first time relay times until the first preset duration, the counter is reset through its contact. When the counter reaches the preset number of times, the first time relay is reset through its contact. The main normally open contact of the counter is connected in series with the coil of the first intermediate relay; the first set of normally open contacts of the first intermediate relay is connected in series with the timing port of the second time relay, and the normally closed contact of the first intermediate relay is connected in series in the closing circuit of the circuit breaker; the normally closed contact of the second time relay is connected in series with the coil of the second intermediate relay and then connected in parallel across the two ends of the timing port of the second time relay, and the second set of normally open contacts of the second intermediate relay is connected in parallel with the main normally open contact.

[0012] Furthermore, it also includes a third intermediate relay; the coil of the third intermediate relay is connected in series with the first set of normally open contacts of the first time relay, and the first set of normally open contacts of the third intermediate relay is connected in series with the reset port of the first time relay, so that the first time relay is reset when timing reaches the first preset duration; the second set of normally open contacts of the third intermediate relay is connected in series with the reset port of the counter, so that the counter is reset when the first time relay times to the first preset duration.

[0013] Furthermore, the third set of normally open contacts of the first intermediate relay is connected in series with the reset port of the counter, so that the counter is reset when it reaches the preset number of times; the second set of normally open contacts of the first intermediate relay is connected in series with the reset port of the first time relay, so that the first time relay is reset when the counter reaches the preset number of times.

[0014] Furthermore, the first set of normally open contacts of the second intermediate relay is connected in parallel across the two ends of the first set of normally open contacts of the first intermediate relay.

[0015] Furthermore, the preset number of times is three; the first preset duration is forty minutes; the second preset duration is three hours.

[0016] The beneficial effects of the present invention are as follows: As an exploratory invention, a timing and counting circuit for a GIS and a breaker control circuit for a GIS provided by the present invention include: a first time relay that starts timing when the timing port is turned on and controls the switching and resetting of its contact state until the first preset duration; a second time relay that starts timing when the timing port is turned on and controls the switching of its contact state until the second preset duration; and a counter that starts counting when the counting port is turned on and controls the switching and resetting of its contact state until the preset number of times is reached. The timing port of the first time relay and the counting port of the counter are used to be connected in series with the normally open contact of the auxiliary switch of the breaker. When the first time relay times until the first preset duration, the counter is reset through its contact. When the counter reaches the preset number of times, the first time relay is reset through its contact. The main normally open contact of the counter is connected in series with the coil of the first intermediate relay. The first set of normally open contacts of the first intermediate relay are connected in series with the timing port of the second time relay, and the normally closed contact of the first intermediate relay is used to be connected in series in the closing circuit of the breaker. The normally closed contact of the second time relay is connected in series with the coil of the second intermediate relay and is connected in parallel across the two ends of the timing port of the second time relay, and the second set of normally open contacts of the second intermediate relay are connected in parallel with the main normally open contact. When the breaker performs a closing operation, the first time relay is used to monitor the opening and closing time of the breaker, and the counter is used to monitor the opening and closing times of the breaker. It can be judged whether the breaker frequently performs opening and closing operations in a short period of time. If the breaker frequently performs opening and closing operations in a short period of time, the closing circuit of the breaker is disconnected through the first intermediate relay, thereby causing the closing function of the breaker to fail and realizing the automatic locking function. After the closing function of the breaker fails for a period of time, the second time relay is used to restore the closing function of the breaker again. On the one hand, the present invention can realize the automatic locking function when it is monitored that the breaker of the GIS frequently opens and closes in a short period of time, reduce the possibility of the breaker exploding or other accidents occurring, and ensure the safe operation of the power grid. On the other hand, it greatly reduces the damage to the performance of the breaker itself and greatly improves the reliability of the GIS operation. Thirdly, the circuit is simple and reliable and has a low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of a conventional closing circuit of a breaker in an existing GIS; Figure 2 is a schematic structural diagram of a timing and counting circuit for a GIS provided by an embodiment of the present invention; Figure 3 is a schematic structural diagram of a breaker control circuit for a GIS provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0019] The concept of the present invention lies in: adding a timing relay and a counter to monitor the opening and closing operations of the circuit breaker within a period of time. If the opening and closing operations of the circuit breaker occur frequently within a period of time, the closing circuit of the circuit breaker is disconnected to achieve the self-locking function of the circuit breaker when it opens and closes frequently in a short period of time.

[0020] Specifically, it includes: a first time relay that starts timing when the timing port is connected and controls the switching of its contact state and resets when the first preset duration is reached, a second time relay that starts timing when the timing port is connected and controls the switching of its contact state when the second preset duration is reached, and a counter that starts counting when the counting port is connected and controls the switching of its contact state and resets when the preset number of times is counted; the timing port of the first time relay and the counting port of the counter are used to be connected in series with the normally open contact of the auxiliary switch of the circuit breaker; when the first time relay times until the first preset duration, the counter is reset through its contact; when the counter counts up to the preset number of times, the first time relay is reset through its contact; the main normally open contact of the counter is connected in series with the coil of the first intermediate relay; the first set of normally open contacts of the first intermediate relay are connected in series with the timing port of the second time relay, and the normally closed contact of the first intermediate relay is used to be connected in series in the closing circuit of the circuit breaker; the normally closed contact of the second time relay is connected in series with the coil of the second intermediate relay and is connected in parallel at both ends of the timing port of the second time relay, and the second set of normally open contacts of the second intermediate relay are connected in parallel with the main normally open contact.

[0021] An implementation manner of a timing and counting circuit of a GIS: The timing and counting circuit of the GIS provided by the embodiment of the present invention can be applied to a conventional station circuit or an intelligent station circuit, etc., and the present invention does not make special limitations thereto. When applied to a conventional station circuit, the circuit breaker locks its own reclosing; when applied to an intelligent station circuit, while the circuit breaker locks its own reclosing, it outputs a locked reclosing GOOSE signal to timely remind the operation and maintenance personnel to perform maintenance.

[0022] Figure 2 is a schematic structural diagram of a timing and counting circuit of a GIS provided by an embodiment of the present invention, as Figure 2As shown, the timing and counting circuit 20 of the GIS includes: a first time relay KT that starts timing when the timing port is turned on and controls the switching and resetting of its contact state until the first preset duration; a second time relay KT1 that starts timing when the timing port is turned on and controls the switching of its contact state until the second preset duration; a counter PC that starts counting when the counting port is turned on and controls the switching and resetting of its contact state until the preset number of times is reached; a first intermediate relay K0; and a second intermediate relay KZ1.

[0023] Specifically, the counting port (1, 4) of the counter PC is used to be connected in series with the first set of normally open contacts (37, 39) of the auxiliary switch Q1 of the circuit breaker; the timing port (1, 4) of the first time relay KT is used to be connected in series with the second set of normally open contacts (41, 43) of the auxiliary switch Q1 of the circuit breaker; the main normally open contacts (6, 8) of the counter PC are connected in series with the coil of the first intermediate relay K0; the coil of the first time relay KT is connected between the live wire L and the neutral wire N; the coil of the counter PC is connected between the live wire L and the neutral wire N; the coil of the first intermediate relay K0 is connected between the live wire L and the neutral wire N.

[0024] The normally closed contacts (1, 2) of the first intermediate relay K0 are used to be connected in series in the closing circuit of the circuit breaker; the first set of normally open contacts (3, 4) of the first intermediate relay K0 are connected in series with the timing port of the second time relay KT1, and the timing port of the second time relay KT1 is connected between the live wire L and the neutral wire N. The normally closed contacts of the second time relay KT1 are connected in series with the coil of the second intermediate relay KZ1 and then are connected in parallel across both ends of the timing port of the second time relay KT1; the second set of normally open contacts (7, 8) of the second intermediate relay KZ1 are connected in parallel across both ends of the main normally open contacts (6, 8) of the counter PC.

[0025] In order to improve the reliability of the energization of the coil of the second intermediate relay KZ1, as an optional implementation manner, the first set of normally open contacts (5, 6) of the second intermediate relay KZ1 are connected in parallel across both ends of the first set of normally open contacts (3, 4) of the first intermediate relay K0.

[0026] When the first time relay KT times until the first preset duration, the counter PC is reset through its contacts; when the counter PC counts up to the preset number of times, the first time relay KT is reset through its contacts.

[0027] Among them, when the first time relay KT times until the first preset duration, its contact is used to reset the counter PC. It can be directly resetting the counter PC by connecting the second set of normally open contacts of the first time relay KT in series with the reset port (1, 3) of the counter PC; it can also be indirectly resetting the counter PC through the first set of normally open contacts (6, 8) of the first time relay KT, etc. The present invention does not make special limitations in this regard. Subsequently, taking the indirect reset of the counter PC through the first set of normally open contacts (6, 8) of the first time relay KT as an example, an exemplary description will be given.

[0028] When indirectly resetting the counter PC through the first set of normally open contacts (6, 8) of the first time relay KT, as an optional implementation manner, the timing and counting loop 20 further includes a third intermediate relay KZ; the coil of the third intermediate relay KZ is connected between the live wire L and the neutral wire N in series with the first set of normally open contacts (6, 8) of the first time relay KT; the first set of normally open contacts (13, 14) of the third intermediate relay KZ is connected in series with the reset port (1, 3) of the first time relay KT to reset the first time relay KT when it times to the first preset duration; the second set of normally open contacts (23, 24) of the third intermediate relay KZ is connected in series with the reset port (1, 3) of the counter PC, so as to achieve the purpose of indirectly resetting the counter PC through the first set of normally open contacts (6, 8) of the first time relay KT, so that the counter PC is reset when the first time relay KT times to the first preset duration.

[0029] Among them, when the counter PC counts up to the preset number of times, its contact is used to reset the first time relay KT. It can be directly resetting the first time relay KT by connecting the second set of normally open contacts of the counter PC in series with the reset port (1, 3) of the first time relay KT; it can also be indirectly resetting the first time relay KT through the main normally open contacts (6, 8) of the counter PC, etc. The present invention does not make special limitations in this regard. Subsequently, taking the indirect reset of the first time relay KT through the main normally open contacts (6, 8) of the counter PC as an example, an exemplary description will be given. When indirectly resetting the first time relay KT through the main normally open contacts (6, 8) of the counter PC, the third set of normally open contacts (7, 8) of the first intermediate relay K0 is connected in series with the reset port (1, 3) of the counter PC to reset the counter PC when it counts up to the preset number of times; the second set of normally open contacts (5, 6) of the first intermediate relay K0 is connected in series with the reset port (1, 3) of the first time relay KT, so as to achieve the purpose of indirectly resetting the first time relay KT through the main normally open contacts (6, 8) of the counter PC, so that the first time relay KT is reset when the counter PC counts up to the preset number of times.

[0030] Among them, the main normally open contacts (6, 8) of the counter PC are connected in series with the coil of the first intermediate relay K0. It can be that the main normally open contacts (6, 8) of the counter PC are connected in series on the line between the coil of the first intermediate relay K0 and the live wire L, or it can be that the main normally open contacts (6, 8) of the counter PC are connected in series on the line between the coil of the first intermediate relay K0 and the neutral wire N. The present invention does not make special limitations on this. Subsequently, taking the main normally open contacts (6, 8) of the counter PC being connected in series on the line between the coil of the first intermediate relay K0 and the live wire L as an example, an exemplary description is given.

[0031] Among them, the second set of normally open contacts (5, 6) of the first intermediate relay K0 are connected in series with the reset port (1, 3) of the first time relay KT. It can be that the 5th contact of the second set of normally open contacts (5, 6) of the first intermediate relay K0 is directly connected to the 3rd interface of the reset port (1, 3) of the first time relay KT, and the 6th contact of the second set of normally open contacts (5, 6) of the first intermediate relay K0 is directly connected to the 1st interface of the reset port (1, 3) of the first time relay KT; for the sake of beauty and convenient wiring, as an optional implementation manner, it can also be that the 5th contact of the second set of normally open contacts (5, 6) of the first intermediate relay K0 is directly connected to the 3rd interface of the reset port (1, 3) of the first time relay KT, and the 5th contact of the second set of normally open contacts (5, 6) of the first intermediate relay K0 is directly connected to the 4th interface of the timing port (1, 4) of the first time relay KT. The present invention does not make special limitations on this.

[0032] Among them, the first set of normally open contacts (13, 14) of the third intermediate relay KZ are connected in series with the reset port (1, 3) of the first time relay KT. It can be that the 13th contact of the first set of normally open contacts (13, 14) of the third intermediate relay KZ is directly connected to the 3rd port of the reset port (1, 3) of the first time relay KT, and the 14th contact of the first set of normally open contacts (13, 14) of the third intermediate relay KZ is directly connected to the 1st port of the reset port (1, 3) of the first time relay KT. For the sake of beauty and convenient wiring, as another optional implementation manner, the 13th contact of the first set of normally open contacts (13, 14) of the third intermediate relay KZ is directly connected to the 3rd port of the reset port (1, 3) of the first time relay KT, and the 14th contact of the first set of normally open contacts (13, 14) of the third intermediate relay KZ is directly connected to the 4th port of the timing port (1, 4) of the first time relay KT.

[0033] Among them, the live wire L is any one of the three-phase live wires. The present invention does not make special limitations on this.

[0034] Among them, the closing circuit of the circuit breaker can be any existing closing circuit of a circuit breaker. For example Figure 1 The closing circuit of the circuit breaker shown; the normally closed contact (1, 2) of the first intermediate relay K0 is used to be connected in series in the closing circuit of the circuit breaker and can be connected in series with any component between the neutral wire and the live wire in the closing circuit. The present invention does not make any special limitation in this regard. In this embodiment, an example is given by taking the line between the normally closed contact (21, 22) of the anti-jump relay KFB connected in series in the closing circuit and the live wire L as an example for illustrative purposes.

[0035] Among them, the first preset duration can be 40 minutes, or 30 minutes, or 1 hour, etc., and can be set according to actual needs. The present invention does not make any special limitation in this regard. Subsequently, taking the first preset duration as 40 minutes as an example for illustrative purposes.

[0036] Among them, the preset number of times can be 3 times, or 4 times, or 5 times, etc., and can be set according to actual needs. The present invention does not make any special limitation in this regard. Subsequently, taking the preset number of times as 3 times as an example for illustrative purposes.

[0037] Among them, the second preset duration can be 3 hours, or 2 hours, or 3.5 hours, etc., and can be set according to actual needs. The present invention does not make any special limitation in this regard. Subsequently, taking the second preset duration as 3 hours as an example for illustrative purposes.

[0038] Next, in combination with Figure 2 , the working principle of the timing and counting circuit of the GIS provided by the embodiment of the present invention will be described in detail.

[0039] When the circuit breaker closes once, the first set of normally open contacts (37, 39) and the second set of normally open contacts (41, 43) of the auxiliary switch Q1 of the circuit breaker close once. The counting port (1, 4) of the counter PC (also called the setting port of the counter PC) counts once when it is turned on, and the reset port (1, 3) of the counter PC resets when it is turned on. The timing port (1, 4) of the first time relay KT (also called the setting port of the first time relay KT) starts timing when it is turned on, and the reset port (1, 3) of the first time relay KT resets when it is turned on.

[0040] Specifically, when the circuit breaker performs a closing operation, the first set of normally open contacts (37, 39) of the auxiliary switch Q1 of the circuit breaker close, and the second set of normally open contacts (41, 43) of the auxiliary switch Q1 of the circuit breaker close.

[0041] When the first set of normally open contacts (37, 39) of the auxiliary switch Q1 of the circuit breaker closes, the counting ports (1, 4) of the counter PC are connected, and the counter PC counts once. When the second set of normally open contacts (41, 43) of the auxiliary switch Q1 of the circuit breaker closes, the timing ports (1, 4) of the first time relay KT are connected, and the first time relay KT starts timing.

[0042] If within the period when the first time relay KT counts up to 40 minutes, the number of closures of the first set of normally open contacts (37, 39) of the auxiliary switch Q1 of the circuit breaker recorded by the counter PC is less than three times, then the number of times the first time relay KT records being energized is also less than three times, which indicates that the circuit breaker has not had frequent opening and closing operations and will not affect the safety of the circuit breaker. Then, the first time relay KT and the counter PC need to be reset for the next cycle of monitoring.

[0043] When the number of times the first time relay KT records being energized is less than three times, the A1 - A2 terminals of the coil of the first time relay KT are energized to generate an action, the first set of normally open contacts (6, 8) of the first time relay KT closes, the coil of the third intermediate relay KZ is energized, the first set of normally open contacts (13, 14) of the third intermediate relay KZ closes, and the second set of normally open contacts (23, 24) of the third intermediate relay KZ closes.

[0044] When the first set of normally open contacts (13, 14) of the third intermediate relay KZ closes, the reset port (1, 3) of the first time relay KT is connected, and the first time relay KT is reset; when the second set of normally open contacts (23, 24) of the third intermediate relay KZ closes, the reset port (1, 3) of the counter PC is connected, and the counter PC is reset.

[0045] That is, when the timing duration of the first time relay KT reaches the first preset duration and the counter PC does not count up to the preset number of times, the first time relay KT realizes self - reset and controls the counter PC to be forced to reset.

[0046] If within the period when the first time relay KT counts up to 40 minutes, the number of closures of the first set of normally open contacts (37, 39) of the auxiliary switch Q1 of the circuit breaker recorded by the counter PC is three times or more, then the number of times the first time relay KT records being energized is also three times or more, which indicates that the circuit breaker has had frequent opening and closing operations and will affect the safety of the circuit breaker. Then, it is necessary to cut off the closing circuit 10 of the circuit breaker so that the circuit breaker stops closing, and the closing function can be restored after a period of time. The first time relay KT and the counter PC are reset for the next cycle of monitoring.

[0047] When the number of times of excitation recorded by the first time relay KT reaches three times, the A1-A2 terminals of the coil of the first time relay KT do not actuate, the first set of normally open contacts (6, 8) of the first time relay KT remain normally open, the coil of the third intermediate relay KZ is de-energized, the first set of normally open contacts (13, 14) of the third intermediate relay KZ remain normally open, and the second set of normally open contacts (23, 24) of the third intermediate relay KZ remain normally open.

[0048] When the number of times of closing of the first set of normally open contacts (37, 39) of the auxiliary switch Q1 of the circuit breaker recorded by the counter PC reaches three times, the main normally open contacts (6, 8) of the counter PC close, the coil of the first intermediate relay K0 is energized, the normally closed contacts (1, 2) of the first intermediate relay K0 open, the first set of normally open contacts (3, 4) of the first intermediate relay K0 close, the second set of normally open contacts (5, 6) of the first intermediate relay K0 close, and the third set of normally open contacts (7, 8) of the first intermediate relay K0 close.

[0049] When the normally closed contacts (1, 2) of the first intermediate relay K0 open, the closing circuit of the circuit breaker is disconnected, and the closing function of the circuit breaker fails. When the first set of normally open contacts (3, 4) of the first intermediate relay K0 close, the timing port of the second time relay KT1 is energized, and the coil of the second intermediate relay KZ1 is energized. When the timing port of the second time relay KT1 is energized, the second time relay KT1 starts timing. When the coil of the second intermediate relay KZ1 is energized, the first set of normally open contacts (5, 6) of the second intermediate relay KZ1 close, the second set of normally open contacts (7, 8) of the second intermediate relay KZ1 close, and the second intermediate relay KZ1 can achieve self-holding. When the second set of normally open contacts (5, 6) of the first intermediate relay K0 close, the reset port (1, 3) of the first time relay KT is connected, and the first time relay KT is reset. When the third set of normally open contacts (7, 8) of the first intermediate relay K0 close, the reset port (1, 3) of the counter PC is connected, and the counter PC is reset. After the counter PC is reset, the main normally open contacts (6, 8) of the counter PC switch from the closed state to the open state.

[0050] That is, when the counter PC counts up to the preset number of times and the timing duration of the first time relay KT has not reached or has reached the first preset duration, the counter PC realizes self-reset and controls the first time relay KT to be forced to reset.

[0051] When the second time relay KT1 counts up to 3 hours, the normally closed contact of the second time relay KT1 disconnects, the coil of the second intermediate relay KZ1 loses power, and the first set of normally open contacts (5, 6) and the second set of normally open contacts (7, 8) of the second intermediate relay KZ1 switch from the closed state to the open state. The coil of the first intermediate relay K0 loses power, and the normally closed contact (1, 2) of the first intermediate relay K0 switches from the open state to the closed state.

[0052] Equivalently, after the closing function of the circuit breaker fails for 3 hours , the closing function is restored.

[0053] A timing and counting circuit of a GIS provided by an embodiment of the present invention includes: a first time relay that starts timing when the timing port is turned on and controls the switching and resetting of its contact state until a first preset duration; a second time relay that starts timing when the timing port is turned on and controls the switching of its contact state until a second preset duration; and a counter that starts counting when the counting port is turned on and controls the switching and resetting of its contact state until a preset number of times is counted; the timing port of the first time relay and the counting port of the counter are used to be connected in series with the normally open contact of the auxiliary switch of the circuit breaker; when the first time relay times until the first preset duration, the counter is reset through its contact; when the counter counts up to the preset number of times, the first time relay is reset through its contact; the main normally open contact of the counter is connected in series with the coil of the first intermediate relay; the first set of normally open contacts of the first intermediate relay are connected in series with the timing port of the second time relay, and the normally closed contact of the first intermediate relay is used to be connected in series in the closing circuit of the circuit breaker; the normally closed contact of the second time relay is connected in series with the coil of the second intermediate relay and then connected in parallel at both ends of the timing port of the second time relay, and the second set of normally open contacts of the second intermediate relay are connected in parallel with the main normally open contact. When the circuit breaker performs a closing operation, the first time relay is used to monitor the opening and closing time of the circuit breaker, and the counter is used to monitor the opening and closing times of the circuit breaker, so as to determine whether the circuit breaker frequently performs opening and closing operations in a short period of time. If the circuit breaker frequently performs opening and closing operations in a short period of time, the closing circuit of the circuit breaker is disconnected through the first intermediate relay, thereby causing the closing function of the circuit breaker to fail and realizing the automatic locking function. After the closing function of the circuit breaker fails for a period of time, the second time relay is used to restore the closing function of the circuit breaker again. On the one hand, the timing and counting circuit of a GIS provided by an embodiment of the present invention can realize the automatic locking function when it is monitored that the circuit breaker of the GIS frequently opens and closes in a short period of time, reduce the possibility of the circuit breaker exploding or other accidents occurring, and ensure the safe operation of the power grid; on the other hand, it greatly reduces the damage to the performance of the circuit breaker itself and greatly improves the reliability of the GIS operation; on the third hand, the circuit is simple and reliable and has a low cost.

[0054] An embodiment of the breaker control circuit of a GIS: Figure 3 It is a schematic structural diagram of a breaker control circuit of a GIS provided by an embodiment of the present invention. As Figure 3 shown, a breaker control circuit of a GIS provided by an embodiment of the present invention includes a closing circuit 10 of the breaker and a timing and counting circuit 20.

[0055] Among them, the relevant introductions of the closing circuit 10 of the breaker and the timing and counting circuit 20 can refer to the relevant expressions in the foregoing "a timing and counting circuit of a GIS", and will not be elaborated here.

[0056] A breaker control circuit of a GIS provided by an embodiment of the present invention can achieve the same beneficial effects as the foregoing "a timing and counting circuit of a GIS", and will not be elaborated here.

Claims

1. A timing and counting circuit for GIS, characterized in that: It includes a first time relay that starts timing when the timing port is connected and controls the contact state to switch and reset when the first preset time period is reached, a second time relay that starts timing when the timing port is connected and controls the contact state to switch when the second preset time period is reached, and a counter that starts counting when the counting port is connected and controls the contact state to switch and reset when the preset number of times is reached; The timing port of the first time relay and the counting port of the counter are used to be connected in series with the normally open contact of the auxiliary switch of the circuit breaker; When the first time relay reaches the first preset time, the counter is reset through its contact; When the counter reaches the preset number of times, the first time relay is reset through its contact; The main normally open contact of the counter is connected in series with the coil of the first intermediate relay; the first group of normally open contacts of the first intermediate relay is connected in series with the timing port of the second time relay, and the normally closed contacts of the first intermediate relay are used to be connected in series in the closing circuit of the circuit breaker; the normally closed contacts of the second time relay are connected in series with the coil of the second intermediate relay and then connected in parallel at both ends of the timing port of the second time relay, and the second group of normally open contacts of the second intermediate relay is connected in parallel with the main normally open contacts.

2. The GIS timing and counting circuit according to claim 1 is characterized in that: It also includes a third intermediate relay; the coil of the third intermediate relay is connected in series with the first group of normally open contacts of the first time relay, and the first group of normally open contacts of the third intermediate relay is connected in series with the reset port of the first time relay, so that the first time relay is reset when the timing reaches a first preset time length; the second group of normally open contacts of the third intermediate relay is connected in series with the reset port of the counter, so that the counter is reset when the timing of the first time relay reaches a first preset time length.

3. The GIS timing and counting circuit according to claim 1 is characterized in that: The third group of normally open contacts of the first intermediate relay is connected in series with the reset port of the counter so that the counter is reset when the preset number of times is reached; the second group of normally open contacts of the first intermediate relay is connected in series with the reset port of the first time relay so that the first time relay is reset when the counter is reset when the preset number of times is reached.

4. The GIS timing and counting circuit according to claim 1 is characterized in that: The first group of normally open contacts of the second intermediate relay is connected in parallel to both ends of the first group of normally open contacts of the first intermediate relay.

5. The GIS timing and counting circuit according to any one of claims 1 to 4, characterized in that: The preset number of times is three times; the first preset duration is forty minutes; and the second preset duration is three hours.

6. A circuit breaker control circuit of a GIS, comprising a closing circuit of a circuit breaker, characterized in that: It also includes a timing and counting circuit; Wherein, the timing and counting circuit includes: a first time relay that starts timing when the timing port is connected and controls the contact state to switch and reset when the first preset time length is reached, a second time relay that starts timing when the timing port is connected and controls the contact state to switch when the second preset time length is reached, and a counter that starts counting when the counting port is connected and controls the contact state to switch and reset when the preset number of times is reached; The timing port of the first time relay and the counting port of the counter are used to be connected in series with the normally open contact of the auxiliary switch of the circuit breaker; When the first time relay reaches the first preset time, the counter is reset through its contact; When the counter reaches the preset number of times, the first time relay is reset through its contact; The main normally open contact of the counter is connected in series with the coil of the first intermediate relay; the first group of normally open contacts of the first intermediate relay is connected in series with the timing port of the second time relay, and the normally closed contacts of the first intermediate relay are connected in series in the closing circuit of the circuit breaker; the normally closed contacts of the second time relay are connected in series with the coil of the second intermediate relay and then in parallel at both ends of the timing port of the second time relay, and the second group of normally open contacts of the second intermediate relay is connected in parallel with the main normally open contacts.

7. The circuit breaker control circuit of GIS according to claim 6, characterized in that: It also includes a third intermediate relay; the coil of the third intermediate relay is connected in series with the first group of normally open contacts of the first time relay, and the first group of normally open contacts of the third intermediate relay is connected in series with the reset port of the first time relay, so that the first time relay is reset when the timing reaches a first preset time length; the second group of normally open contacts of the third intermediate relay is connected in series with the reset port of the counter, so that the counter is reset when the timing of the first time relay reaches a first preset time length.

8. The circuit breaker control circuit of GIS according to claim 6, characterized in that: The third group of normally open contacts of the first intermediate relay is connected in series with the reset port of the counter so that the counter is reset when the preset number of times is reached; the second group of normally open contacts of the first intermediate relay is connected in series with the reset port of the first time relay so that the first time relay is reset when the counter is reset when the preset number of times is reached.

9. The circuit breaker control circuit of GIS according to claim 6, characterized in that: The first group of normally open contacts of the second intermediate relay is connected in parallel to both ends of the first group of normally open contacts of the first intermediate relay.

10. The circuit breaker control circuit of GIS according to any one of claims 6 to 9, characterized in that: The preset number of times is three times; the first preset duration is forty minutes; and the second preset duration is three hours.

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