阅读说明：本技术 开合闸装置 (Switching device ) 是由 杨蔚仲 刘玉和 德令军 李长发 张俞 杨晓云 李柄桥 于 2020-04-09 设计创作，主要内容包括：本发明公开了一种开合闸装置,包括：第一电压继电器,在二次回路中零序电压的增大值到达预设值时进行触点闭合；第一时间继电器,用于在所述第一电压继电器的触点闭合之后,经过t1延迟进行触点闭合；第一中间继电器,用于在第一时间继电器的触点闭合之后,将一回路操作把手的跳闸接点进行闭合；第二时间继电器,用于在所述第一电压继电器的触点闭合之后,经过t2延迟进行触点闭合；第二中间继电器,用于在第二时间继电器的触点闭合之后,将二回路操作把手的跳闸接点进行闭合。本发明提供的开合闸装置,可以自动的进行一回路、二回路以及三回路的开合闸,实现迅速、可靠切除6kv中性点不接地系统接地故障线路,减少影响范围,保证了人身安全。(The invention discloses an opening and closing brake device, comprising: the first voltage relay is used for closing a contact when the increment of the zero sequence voltage in the secondary circuit reaches a preset value; a first time relay for performing contact closing with a delay of t1 after the contact of the first voltage relay is closed; the first intermediate relay is used for closing a tripping contact of the loop operation handle after the contact of the first time relay is closed; a second time relay for performing contact closing with a delay of t2 after the contact of the first voltage relay is closed; and the second intermediate relay is used for closing the tripping contact of the two-circuit operating handle after the contact of the second time relay is closed. The switching device provided by the invention can automatically switch the primary circuit, the secondary circuit and the tertiary circuit, quickly and reliably cut the grounding fault line of the 6kv neutral ungrounded system, reduce the influence range and ensure the personal safety.)

1. The utility model provides an opening and shutting floodgate device, opening and shutting floodgate device is applied to 6KV neutral point ungrounded power supply system which characterized in that includes:

the first voltage relay is used for acquiring an increase value of zero sequence voltage in a secondary circuit of the 6KV neutral point ungrounded power supply system, and when the increase value reaches a preset value, a contact of the first voltage relay is closed;

the first time relay is connected with the first voltage relay and used for delaying the contact closing after the contact closing of the first voltage relay is finished, and t1 is formed;

the power end of the first switching intermediate relay is connected with the first time relay, and the contact of the first switching intermediate relay is connected with the tripping contact of the loop operating handle and used for closing the tripping contact of the loop operating handle after the contact of the first time relay is closed;

the second time relay is connected with the first voltage relay and used for delaying the contact closing after the contact closing of the first voltage relay through t 2;

the power end of the second disconnecting intermediate relay is connected with the second time relay, and the contact of the second disconnecting intermediate relay is connected with the tripping contact of the two-loop operating handle and used for closing the tripping contact of the two-loop operating handle after the contact of the second time relay is closed;

a third time relay connected with the first voltage relay and used for delaying the contact closing after the contact closing of the first voltage relay through t 3;

the power end of the third switching intermediate relay is connected with the second time relay, and the contact of the third switching intermediate relay is connected with the tripping contact of the three-loop operating handle and used for closing the tripping contact of the three-loop operating handle after the contact of the third time relay is closed;

the fourth time relay is connected with the first voltage relay and used for delaying the contact closing through T1 after the contact closing of the first voltage relay;

the contact of the first switching-on intermediate relay is connected with the switching-on contact of the primary circuit operating handle and is used for closing the switching-on contact of the primary circuit operating handle after the contact of the fourth time relay is closed;

the fifth time relay is connected with the first voltage relay and used for delaying the contact closing through T2 after the contact closing of the first voltage relay;

the contact of the second closing intermediate relay is connected with the closing contact of the two-loop operating handle and is used for closing the closing contact of the two-loop operating handle after the contact of the fifth time relay is closed;

a sixth time relay, the first voltage relay being connected for contact closing delayed by T3 after the contacts of the first voltage relay are closed;

the power end of the third switching-on intermediate relay is connected with the sixth time relay, and the contact of the third switching-on intermediate relay is connected with the switching-on contact of the three-loop operating handle and used for closing the switching-on contact of the three-loop operating handle after the contact of the sixth time relay is closed;

wherein T1< T1< T2, T1+ T2< T2< T3, T1+ T2+ T3< T3.

2. The switching device according to claim 1, wherein the power terminal of the first switching intermediate relay is connected to the first time relay through the normally closed contact of the first switching intermediate relay and the normally closed contact of the auxiliary switch of the first circuit breaker, wherein the first circuit breaker is a circuit breaker;

and the power supply end of the first closing intermediate relay is connected with the fourth time relay through the normally closed contact of the first opening intermediate relay.

3. The opening and closing device according to claim 2, wherein the power terminal of the second opening intermediate relay is connected to the second time relay through the normally closed contact of the second closing intermediate relay and the normally closed contact of the auxiliary switch of the second circuit breaker, wherein the second circuit breaker is a two-circuit breaker;

and the power supply end of the second closing intermediate relay is connected with the fifth time relay through the normally closed contact of the second opening intermediate relay.

4. The opening and closing device according to claim 3, wherein the power terminal of the third opening intermediate relay is connected to the third time relay through the normally closed contact of the third closing intermediate relay and the normally closed contact of the auxiliary switch of the third circuit breaker, wherein the third circuit breaker is a three-circuit breaker;

and a power supply end of the third switching-on intermediate relay is connected with the sixth time relay through a normally closed contact of the third switching-off intermediate relay.

5. The switching device according to claim 4, further comprising a second voltage relay and a third voltage relay;

and the input end of the first voltage relay is connected with a bus of the secondary circuit through the second voltage relay and the third voltage relay.

Technical Field

The present invention relates to a ground protection for a power supply system line, and more particularly, to a switching device.

Background

At present, a 6KV neutral point ungrounded power supply system is widely applied to equipment such as box transformers and power distribution stations.

Disclosure of Invention

The invention aims to provide an opening and closing brake device which can realize accurate tripping of a fault line.

In order to achieve the above object, the present invention provides an opening/closing brake device, which is applied to a 6KV neutral point ungrounded power supply system, and includes: the first voltage relay is used for acquiring an increase value of zero sequence voltage in a secondary circuit of the 6KV neutral point ungrounded power supply system, and when the increase value reaches a preset value, a contact of the first voltage relay is closed; the first time relay is connected with the first voltage relay and used for delaying the contact closing after the contact closing of the first voltage relay is finished, and t1 is formed; the power end of the first switching intermediate relay is connected with the first time relay, and the contact of the first switching intermediate relay is connected with the tripping contact of the loop operating handle and used for closing the tripping contact of the loop operating handle after the contact of the first time relay is closed; the second time relay is connected with the first voltage relay and used for delaying the contact closing after the contact closing of the first voltage relay through t 2; the power end of the second disconnecting intermediate relay is connected with the second time relay, and the contact of the second disconnecting intermediate relay is connected with the tripping contact of the two-loop operating handle and used for closing the tripping contact of the two-loop operating handle after the contact of the second time relay is closed; a third time relay connected with the first voltage relay and used for delaying the contact closing after the contact closing of the first voltage relay through t 3; the power end of the third switching intermediate relay is connected with the second time relay, and the contact of the third switching intermediate relay is connected with the tripping contact of the three-loop operating handle and used for closing the tripping contact of the three-loop operating handle after the contact of the third time relay is closed; the fourth time relay is connected with the first voltage relay and used for delaying the contact closing through T1 after the contact closing of the first voltage relay; the contact of the first switching-on intermediate relay is connected with the switching-on contact of the primary circuit operating handle and is used for closing the switching-on contact of the primary circuit operating handle after the contact of the fourth time relay is closed; the second closing time relay is connected with the first voltage relay and used for delaying the contact closing through T2 after the contact closing of the first voltage relay; the power end of the second switching-on intermediate relay is connected with the fifth time relay, and the contact of the fifth intermediate relay is connected with the switching-on contact of the two-loop operating handle and used for switching on the switching-on contact of the two-loop operating handle after the contact of the fifth time relay is switched on; a sixth time relay, the first voltage relay being connected for contact closing delayed by T3 after the contacts of the first voltage relay are closed; the power end of the third switching-on intermediate relay is connected with the sixth time relay, and the contact of the third switching-on intermediate relay is connected with the switching-on contact of the three-loop operating handle and used for closing the switching-on contact of the three-loop operating handle after the contact of the sixth time relay is closed; wherein T1< T1< T2, T1+ T2< T2< T3, T1+ T2+ T3< T3.

In a preferred embodiment, the power supply terminal of the first opening intermediate relay is connected to the first time relay through the normally closed contact of the first closing intermediate relay and the normally closed contact of the auxiliary switch of the first circuit breaker, wherein the first circuit breaker is a circuit breaker of a circuit; and the power supply end of the first closing intermediate relay is connected with the fourth time relay through the normally closed contact of the first opening intermediate relay.

In a preferred embodiment, the power supply terminal of the second switching-off intermediate relay is connected to the first time relay through the normally closed contact of the second switching-on intermediate relay and the normally closed contact of the auxiliary switch of the second circuit breaker, wherein the second circuit breaker is a circuit breaker of a two-circuit loop; and the power supply end of the second closing intermediate relay is connected with the fifth time relay through the normally closed contact of the second opening intermediate relay.

In a preferred embodiment, the power supply terminal of the third switching intermediate relay is connected to the third time relay via the normally closed contact of the third switching intermediate relay and the normally closed contact of the auxiliary switch of the third circuit breaker, wherein the third circuit breaker is a three-circuit breaker; and a power supply end of the third switching-on intermediate relay is connected with the sixth time relay through a normally closed contact of the third switching-off intermediate relay.

In a preferred embodiment, the device further comprises a second voltage relay and a third voltage relay; and the input end of the first voltage relay is connected with a bus of the secondary circuit through the second voltage relay and the third voltage relay.

Compared with the prior art, the switching device disclosed by the invention can be used for rapidly and reliably cutting off the grounding fault line of a 6kv neutral ungrounded system by automatically switching the primary circuit, the secondary circuit and the tertiary circuit, reducing the influence range, avoiding the damage of electric equipment and power supply equipment, improving the power supply quality and ensuring the personal safety. In addition, the opening and closing brake device provided by the embodiment has the advantages of few components, few wiring, reliable action and the like, and can be transformed under the normal operation of equipment.

Drawings

Fig. 1 is a schematic structural diagram of an opening/closing gate device according to an embodiment of the invention.

Fig. 2 is a schematic diagram of an opening/closing device according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of the connection mode of the second voltage relay and the third voltage relay according to an embodiment of the present invention.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

As shown in fig. 1, which is a schematic structural diagram of an opening and closing apparatus applied to a 6KV neutral point ungrounded power supply system according to a preferred embodiment of the present invention, includes a first voltage relay L YJ, a first time relay SJ1, a first switching intermediate relay FZJ1, a second time relay SJ2, a second switching intermediate relay FZJ2, a third time relay SJ3, a third switching intermediate relay FZJ3, a fourth time relay SJ4, a first closing intermediate relay HZJ1, a fifth time relay SJ5, a second closing intermediate relay HZJ2, a sixth time relay SJ6, and a third closing intermediate relay HZJ 3.

The device comprises a first voltage relay L YJ, a first time relay SJ1, a first voltage relay SJ, a first time relay SJ1 and a first tripping intermediate relay FZJ1, wherein the first voltage relay L YJ is used for collecting an increase value (action value) of zero-sequence voltage in a secondary circuit of a 6KV neutral point ungrounded power supply system, when the increase value reaches a preset value, a contact of the first voltage relay L YJ is closed, the first time relay SJ1 is respectively connected with the first voltage relay L YJ and is used for closing the contact after the contact of the first voltage relay L YJ is closed and delaying for closing the contact after t1, a power supply end of the first tripping intermediate relay FZJ1 is connected with the first time relay SJ1, and a contact of the first tripping intermediate relay FZJ1 is connected with a tripping contact of a loop operation handle and is.

Second time relays SJ2 are connected to the first excitation voltage relay L YJ, respectively, for closing the contacts after a delay of t2 after the contacts of the first voltage relay L YJ are closed, and power terminals of the second shunt intermediate relays FZJ2 are connected to the second time relays SJ2, and the contacts of the second intermediate relays FZJ2 are connected to the trip contacts of the two-circuit operating handle, for closing the trip contacts of the two-circuit operating handle after the contacts of the second time relays are closed.

A third time relay SJ3 is connected to the first voltage relay L YJ for contact closing after a delay of t3 after the contacts of the first voltage relay L YJ are closed, a power supply terminal of the third intermediate tripper relay FZJ3 is connected to the third time relay SJ3, and a contact of the third intermediate tripper relay FZJ3 is connected to the trip contact of the three-circuit operating handle for closing the trip contact of the three-circuit operating handle after the contacts of the third time relay are closed.

The fourth time relay SJ4 is connected with the first voltage relay L YJ and used for delaying contact closing after a T1 delay after a contact of the first voltage relay L YJ is closed, the power supply end of the first closing intermediate relay HZJ1 is connected with the fourth time relay SJ4, a contact of the first closing intermediate relay HZJ1 is connected with a closing contact of a loop operation handle and used for closing the closing contact of the loop operation handle after the contact of the fourth time relay is closed.

A fifth time relay SJ5 is connected to the first voltage relay L YJ for delaying the contact closing by T2 after the contact of the first voltage relay L YJ is closed, a power source terminal of the second intermediate relay HZJ2 is connected to the fifth time relay SJ5, and a contact of the second closing intermediate relay HZJ2 is connected to the closing contact of the two-circuit operating handle for closing the closing contact of the two-circuit operating handle after the contact of the fifth time relay is closed.

A sixth time relay SJ6 is connected to the first voltage relay L YJ, and is configured to perform contact closing after a delay of T3 after the contact of the first voltage relay L YJ is closed, a power supply terminal of the third switching-on intermediate relay HZJ3 is connected to the sixth time relay SJ6, and a contact of the third switching-on intermediate relay HZJ3 is connected to a switching-on contact of the three-circuit operating handle, and is configured to perform switching-on contact of the three-circuit operating handle after the contact of the sixth time relay is closed.

Wherein T1< T1, T1+ T1< T1, T1+ T1+ T1< T1, after the contacts of first voltage relay 1 YJ are closed, first switching time relay SJ1 controls the contacts of first switching intermediate relay 1 to be closed after T1 is delayed, the trip contacts of a loop operation handle are closed, a loop is tripped, if the loop is a fault, zero sequence voltage signals disappear after the loop is tripped, each intermediate relay stops operating, after 1 is closed, if zero sequence voltage signals exist, which indicates that the fault is not a loop, fourth switching time relay SJ1 controls the contacts of fourth switching intermediate relay HZJ1 to be closed after T1 is delayed, the switching contacts of the loop operation handle are closed, reclosing is performed, second switching time relay SJ1 controls the contacts of third switching intermediate relay 1 to be closed after T zero sequence, the contacts of second switching intermediate relay HZJ switch operation handle are closed, after T switching relay 1, the contacts of a third switching time relay is closed, after T switching time relay 1, a third switching time relay is closed, a third switching time relay SJ switch contact is closed, a third switching time relay SJ switch.

Therefore, the switching device provided by the embodiment can rapidly and reliably cut off the grounding fault line of the 6kv neutral ungrounded system by automatically switching the primary circuit, the secondary circuit and the tertiary circuit, reduces the influence range, avoids the damage of electric equipment and power supply equipment, improves the power supply quality and ensures the personal safety. In addition, the opening and closing brake device provided by the embodiment has the advantages of few components, few wiring, reliable action and the like, and can be transformed under the normal operation of equipment.

In addition, after the ground fault occurs, because the number of power failure lines is large, the load influence is large, in order to meet the production requirement, the automatic reclosing function for recovering the operation of the non-fault cable line is added in the circuit of the line selection tripping, and the automatic reclosing function can be completed after the fault line is tripped.

In this embodiment, the power supply terminal of the first opening intermediate relay FZJ1 is connected to the delay closing contact of the first time relay SJ1 through the normally closed contact of the first closing intermediate relay HZJ1 and the normally closed contact of the auxiliary switch D L of the first circuit breaker, the power supply terminal of the first closing intermediate relay HZJ1 is connected to the delay closing contact of the time relay SJ4 through the normally closed contact of FZJ1, the power supply terminal of the second opening intermediate relay FZJ2 is connected to the delay closing contact of the second time relay SJ2 through the normally closed contact of the second opening intermediate relay HZJ2 and the normally closed contact of the auxiliary switch D L of the second circuit breaker, the power supply terminal of the second opening intermediate relay HZJ2 is connected to the delay closing contact of the fifth time relay SJ5 through the normally closed contact of FZJ2, the power supply terminal of the third opening intermediate relay FZJ3 is connected to the normally closed contact of the third time relay SJ3 through the normally closed contact of the auxiliary switch D856 of the third circuit breaker, and the power supply terminal of the third opening intermediate relay is connected to the delay closing contact of the third circuit breaker 3673727, wherein the third opening intermediate relay is connected to the normally closed contact of the delay closing relay SJ 3.

When a certain feed-out line (loop) fails (a single-phase earth fault occurs), the secondary side zero sequence voltage (or opening voltage) of a 6kV incoming line interval PT (voltage transformer) of the box transformer substation starts to rise to reach a zero sequence voltage relay action value, and the voltage relay L YJ in the embodiment is also called a zero sequence voltage relay.

When the voltage rises to reach the preset action value of the YJ of the zero-sequence voltage relay L, the zero-sequence voltage relay acts, the junction point of the zero-sequence voltage relay is changed from normally open to closed (the series-connected ZJ4 normally closed point plays a role of locking), and therefore time relays SJ1, SJ2, SJ3, SJ4, SJ5, SJ6 and SJ7 are excited (time relay coils are switched on).

When the preset action value T1 is 10S, T1 is 12S, T2 is 17sT2 is 19S, T3 is 24S, T3 is 26S, the closed SJ1 node passes through the auxiliary contact D L (the auxiliary contact on the breaker body) when the time delay of 10S is delayed, the normally closed node of the closing relay (the above two nodes play a role in blocking) turns on the coil of the intermediate relay FZJ1, i.e., the excitation opening relay FZJ1, and after FZJ1 is actuated (the passive normally open contact is turned on), the opening operation handle switch node ③④ of the breaker body is turned on, at this moment, the breaker performs tripping.

In one embodiment, the device also has the function of preventing the mistaken closing of the circuit which is already opened by other protection (current one-stage, two-stage, three-stage, etc.) actions (keeping the original opening state of the circuit breaker of the circuit. The principle is that the device selectively trips and recloses a non-faulted line if and only if a line is faulted due to the occurrence of a ground fault.

The intermediate relays ZJ01, ZJ02 and ZJ03 are used for identifying and selectively reclosing, namely reclosing can be carried out only when a ground fault occurs in a closed state of a primary circuit breaker, a secondary circuit breaker or a tertiary circuit breaker, and the state of the breaker of a certain primary circuit before the ground fault occurs is identified, if the breaker is in an open position (including protection tripping, standby and maintenance states), the intermediate relays FZJ1, FZJ2 and FZJ3 are not operated (D L1, D L2 or D L3 is in an open position when the breaker is in the trip position), the intermediate relays ZJ01, ZJ02 and ZJ03 are not operated (normally open contacts FZJ1, FZJ2 and FZJ3 are not closed), and the intermediate relays SJ4, SJ5 and SJ6 are not operated (normally open contacts ZJ01, ZJ02 and ZJ03 are not normally open and normally closed), so that reclosing cannot be carried out.

As shown in figure 2, the broken line part is a circuit breaker body auxiliary switch locking node D L which is used for matching with a closing relay HZJ normally closed point to prevent the jumping phenomenon of the interval circuit breaker, the principle is that when the line ground fault of a tripping circuit is not eliminated, an increased zero sequence voltage action value still exists, namely a tripping command still exists, the tripping command is completed by using a L YJ node which is connected in series in a detection circuit to prevent the circuit from being opened and closed again, the normally closed point of an intermediate relay ZJ4 is opened and is also self-locked by a time relay SJ7, and a 'box transformer internal fault' alarm (yellow signal light) is sent, so that the circuit breaker can be opened and closed only once circularly.

In one embodiment, because of the influence of primary and secondary fuse fusing (TV disconnection) of the voltage transformer, in order to avoid the misoperation of a line caused by the TV disconnection, normally open nodes of two voltage relays are connected in series in a line selection tripping circuit.

Specifically, the switching device of the embodiment further includes a second voltage relay YJ1 and a third voltage relay YJ2, an input end of the first voltage relay L YJ is connected with a bus of the secondary circuit through the second voltage relay YJ1 and the third voltage relay YJ2, as shown in fig. 3, the switching device is a schematic diagram of a connection mode of the second voltage relay YJ1 and the third voltage relay YJ2, the YJ1 is respectively connected with UAUB of zero sequence voltage in the secondary circuit, and the YJ2 is respectively connected with UBUC of zero sequence voltage in the secondary circuit.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.