CN222146026U - Live locking device for fixed contact baffle of switch cabinet - Google Patents
Live locking device for fixed contact baffle of switch cabinet Download PDFInfo
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- CN222146026U CN222146026U CN202420868937.XU CN202420868937U CN222146026U CN 222146026 U CN222146026 U CN 222146026U CN 202420868937 U CN202420868937 U CN 202420868937U CN 222146026 U CN222146026 U CN 222146026U
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- static contact
- switch cabinet
- circuit breaker
- baffle
- live
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Abstract
The utility model provides a live locking device for a static contact baffle of a switch cabinet, which belongs to the field of power distribution systems and comprises a circuit breaker handcart, a voltage relay YJ, an intermediate relay KA, an air switch QF and a locking electromagnet RL, wherein a normally open contact YJ1 of the voltage relay YJ is connected with a normally closed contact KA1 of the intermediate relay KA in series and then is connected into a power supply loop of the locking electromagnet RL, a normally closed auxiliary contact Q1 of the circuit breaker handcart is connected with an auxiliary contact S1 at a working position of the circuit breaker handcart in parallel and then is connected into a coil loop of the intermediate relay KA in series, and the power supply loop of the voltage relay YJ, the power supply loop of the locking electromagnet RL and the coil loop of the intermediate relay KA are all finally connected to positive and negative output terminals of the air switch QF, and a static contact or a bus of the switch cabinet is electrified, so that the locking static contact isolation baffle cannot be opened to isolate a charged part to prevent personnel.
Description
Technical Field
The utility model relates to the technical field of power distribution systems, in particular to a live locking device for a fixed contact baffle of a switch cabinet.
Background
The indoor alternating current metal closed switch equipment used by each power supply and distribution system is complete power distribution equipment commonly used by a 3.6-12kV three-phase alternating current power supply system, is matched with a circuit breaker handcart, is mainly used for power plant station power systems, power distribution of working condition enterprises, secondary transformation and power transmission of power systems, and places such as large-scale high-voltage motor starting and the like, and has the functions of control, protection, monitoring and the like. When the switch cabinet provided with the circuit breaker handcart is pulled out of the cabinet for inspection and maintenance, staff habitually inspects and maintains all parts in the cabinet, at the moment, the upper fixed contact in the cabinet is usually in a charged state, after the circuit breaker handcart is pulled out of the cabinet door, the charged parts are automatically isolated by virtue of the movable baffle, but the movable baffle can be moved by slightly lifting by the staff, so that contact accidents are caused. In recent years, the electric shock accidents are frequent, and because the voltage level is high, the electric discharge is usually formed without touching an electrified part, the electric shock accidents are generated, the hazard is extremely high, the electric shock probability is relatively small for staff with higher occupational literacy, but if the accidents are radically stopped, the intrinsic safety of the switch cabinet is still required to be realized, and the safety can be improved.
Disclosure of utility model
The utility model aims to solve the technical problem of improving the safety of isolation of the electrified static contact in the high-voltage switch cabinet.
The technical scheme is that the live locking device for the static contact baffle of the switch cabinet comprises a circuit breaker handcart, a voltage relay YJ, an intermediate relay KA, an air switch QF and a locking electromagnet RL, wherein a normally open contact YJ1 of the voltage relay YJ is connected with a normally closed contact KA1 of the intermediate relay KA in series and then is connected into a power circuit of the locking electromagnet RL, a normally closed auxiliary contact Q1 of the circuit breaker handcart is connected with an auxiliary contact S1 of a working position of the circuit breaker handcart in parallel and then is connected into a coil circuit of the intermediate relay KA in series, and the power circuit of the voltage relay YJ, the power circuit of the locking electromagnet RL and the coil circuit of the intermediate relay KA are all finally connected to positive and negative output terminals of the air switch QF.
According to the utility model, common parts such as the voltage relay YJ, the intermediate relay KA and the locking electromagnet RL are utilized, and the auxiliary contacts of the switch cabinet body are matched, so that the locking static contact isolation baffle can not be opened under the condition that the static contact or the bus of the switch cabinet is electrified, and the electrified part is isolated to prevent personnel from electric shock.
Preferably, the circuit breaker handcart is positioned in the switch cabinet, the secondary plug is not pulled out, the locking electromagnet RL is not electrified, and the fixed contact baffle is unlocked.
Preferably, the high-voltage busbar is electrified, the circuit breaker handcart is moved out of the cabinet, the locking electromagnet RL is electrified, and the fixed contact baffle is locked.
Preferably, the high-voltage busbar is electrified, the circuit breaker handcart is located at a test position, the secondary plug is pulled out, the locking electromagnet RL is electrified, and the fixed contact baffle is locked.
Preferably, the high-voltage busbar of the switch cabinet is powered off, the locking electromagnet RL is powered off, and the fixed contact baffle is unlocked.
Preferably, the normally closed auxiliary contact Q1 of the circuit breaker handcart is positioned inside the circuit breaker handcart.
Preferably, the auxiliary contact S1 for the working position of the circuit breaker handcart is positioned in a circuit breaker switch cabinet or the circuit breaker handcart.
Preferably, the acquisition loop of the voltage relay YJ is connected in parallel with the lower opening of the secondary side fuse wire of the voltage transformer in the secondary terminal chamber in the cabinet, or is connected in parallel with the electric energy metering loop, or is connected in parallel with the relay protection loop.
Preferably, the switch cabinet fixed contact comprises an upper fixed contact and a lower fixed contact, and the upper fixed contact and the lower fixed contact are both positioned on the inner side surface of the switch cabinet.
Preferably, both ends of the baffle plates of the upper static contact and the lower static contact are arranged in the switch cabinet through guide rails, and the locking electromagnet RL is positioned on the side edge of the guide rail on one side of the baffle plate of the upper static contact.
The utility model provides the advantages that:
According to the utility model, common parts such as the voltage relay YJ, the intermediate relay KA and the locking electromagnet RL are utilized, and the auxiliary contacts of the switch cabinet body are matched, so that the locking fixed contact isolation baffle can not be opened under the condition that the fixed contact or the bus of the switch cabinet is electrified, thereby isolating electrified parts to prevent personnel from electric shock, greatly improving the safety of equipment, reducing the electric shock risk of staff and converting the switch cabinet into intrinsically safe equipment. The characteristics of the operation mode of the breaker handcart in the switch cabinet are combined, and the auxiliary contacts of the breaker handcart and the auxiliary contacts of the position in the switch cabinet are utilized to flexibly control the locking loop, so that production and maintenance are realized.
Drawings
Fig. 1 is a circuit diagram of a static contact baffle live locking device of a switch cabinet, which is provided by an embodiment of the utility model, by adopting a voltage relay YJ;
Fig. 2 is a schematic diagram of a position of a latching electromagnet RL in a live latching device for a fixed contact baffle of a switchgear according to an embodiment of the present utility model;
Fig. 3 is a circuit diagram of a switch cabinet static contact baffle live locking device adopting a high-voltage live display HL according to an embodiment of the utility model.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1, the embodiment provides a live locking device for a static contact baffle of a switch cabinet, which comprises a circuit breaker handcart, a voltage relay YJ, an intermediate relay KA, an air switch QF and a locking electromagnet RL, wherein a normally open contact YJ1 of the voltage relay YJ is connected with a normally closed contact KA1 of the intermediate relay KA in series and then is connected with a power supply loop of the locking electromagnet RL, a normally closed auxiliary contact Q1 of the circuit breaker handcart is connected with an auxiliary contact S1 of a working position of the circuit breaker handcart in parallel and then is connected with a coil loop of the intermediate relay KA in series, and the power supply loop of the voltage relay YJ, the power supply loop of the locking electromagnet RL and the coil loop of the intermediate relay KA are connected to positive and negative output terminals of the air switch QF.
When the circuit breaker is in a breaking state, the normally closed auxiliary contact Q1 of the circuit breaker handcart is closed, and when the circuit breaker handcart is in a working position, the auxiliary contact S1 of the working position of the circuit breaker handcart is closed, and the air switch QF is a control power supply branch air switch in the switch cabinet. The normally closed auxiliary contact Q1 of the circuit breaker handcart is positioned in the circuit breaker handcart body, a secondary plug connected with the secondary circuit of the circuit breaker and the secondary circuit of the switch cabinet is connected into the closed circuit, the auxiliary contact S1 of the working position of the circuit breaker handcart is positioned in the switch cabinet, and the auxiliary contact S1 can also be positioned in the circuit breaker handcart body and connected into the closed circuit through the secondary plug.
The voltage relay YJ is connected in parallel with a lower opening of a fuse wire at the secondary side of the voltage transformer in the secondary terminal chamber in the cabinet, or connected in parallel with the electric energy metering loop, or connected in parallel with the relay protection loop, and is used for collecting electrified signals and is matched with a special air switch or a special fuse, so that the secondary side short circuit of the voltage transformer caused by loop faults is prevented.
The state of the closed loop is divided into the following 4 cases:
1. When the circuit breaker trolley is located in the switch cabinet, and the secondary plug is inserted into the circuit breaker trolley. At the moment, the breaker handcart has four states, namely ① a test position opening state, ② a working position opening state, ③ a working position closing state and ④ a process proceeding state of the breaker handcart from the test position to the working position. The circuit breaker handcart normally-closed auxiliary contact Q1 is closed in a state ①, the intermediate relay KA is powered on, the normally-closed contact KA1 is opened, the blocking electromagnet RL is powered off, namely the static contact baffle is unlocked, the circuit breaker handcart normally-closed auxiliary contact Q1 is closed in a state ②, the intermediate relay KA is powered on, the normally-closed contact KA1 is opened, the blocking electromagnet RL is powered off, namely the static contact baffle is unlocked, the circuit breaker handcart normally-closed auxiliary contact Q1 is opened in a state ③, the intermediate relay KA is powered on, the normally-closed contact KA1 is opened, the blocking electromagnet RL is powered off, namely the static contact baffle is unlocked, the circuit breaker handcart normally-closed auxiliary contact Q1 is closed in a state ④, the intermediate relay KA is powered on, the normally-closed contact KA1 is powered off, namely the static contact baffle is unlocked. In summary, as long as the circuit breaker handcart is positioned in the switch cabinet and the secondary plug is inserted into the circuit breaker handcart, the locking electromagnet RL cannot be electrified and the fixed contact baffle is unlocked no matter whether the high-voltage busbar of the switch cabinet is electrified or not.
2. When the high-voltage busbar of the switch cabinet is electrified, and the circuit breaker handcart moves out of the cabinet, the PT secondary side small busbar positioned in the cabinet top is electrified at the moment, the voltage relay YJ receives a voltage signal to act, the normally open contact YJ1 is closed, and preparation for action of the locking electromagnet RL is made. Because the circuit breaker handcart has removed outside the cabinet, circuit breaker handcart normal close auxiliary contact Q1, circuit breaker handcart working position auxiliary contact S1 all must break, and intermediate relay KA loses the electricity, and normal close contact KA1 is closed, so latching electromagnet RL gets the electricity, and the stationary contact baffle is in the locking state. In summary, the stationary contact baffle 100 is latched when the high voltage busbar is charged and the circuit breaker trolley is removed from the cabinet. As shown in fig. 2, the stationary contact baffle 100 is not freely movable, and the charged portion is prevented from being exposed, thereby preventing an operator from getting an electric shock.
3. When the high-voltage busbar of the switch cabinet is electrified, the circuit breaker handcart is positioned at a test position and the secondary plug is pulled out, at the moment, the PT secondary side small busbar positioned in the cabinet top is electrified, the voltage relay YJ receives a voltage signal to act, the normally open contact YJ1 is closed, and the preparation of the action of the locking electromagnet RL is made. Because the circuit breaker handcart is positioned at the test position and the secondary plug is pulled out, the normally closed auxiliary contact Q1 of the circuit breaker handcart connected to the control loop of the electromagnet RL through the secondary plug is opened, the auxiliary contact S1 of the working position of the circuit breaker handcart is opened, the intermediate relay KA is powered off, the normally closed contact KA1 is closed, the locking electromagnet RL is powered on, and the fixed contact baffle is in a locking state.
4. When the high-voltage busbar of the switch cabinet is in power failure. According to the above, at this time, no matter whether the breaker handcart in the switch cabinet is switched on, moves out of the cabinet or the secondary plug is pulled out, the normally open contact YJ1 is disconnected due to the power failure of the voltage relay YJ, and the latching electromagnet RL is in a power failure state, namely, the static contact baffle is in a releasing latching state. In summary, when the high-voltage busbar of the switch cabinet fails, the static contact lock is released.
The circuit breaker handcart is in the switch cabinet, the secondary plug is inserted into the circuit breaker handcart, namely the circuit breaker handcart is in a hot standby state or a cold standby state, the locking of the fixed contact baffle is released no matter whether the high-voltage busbar is electrified or not, and the fixed contact baffle is still in the unlocking state along with the position conversion of the circuit breaker handcart, and can move at will. The design is that the operator cannot touch the fixed contact due to the blocking of the circuit breaker handcart and the cabinet door, the fixed contact baffle is not required to be locked, the requirement that the fixed contact baffle cannot be locked when the circuit breaker handcart enters the working position from the test position is met, the actual use requirement is met, the safety of the operator is ensured, and the reduction of the service period of the locking electromagnet caused by long-term electrification is avoided. 2. When the high-voltage busbar is electrified and the circuit breaker handcart moves out of the cabinet, the fixed contact baffle is locked, so that the safety of operators is protected. 3. When the high-voltage busbar of the switch cabinet is electrified, the circuit breaker handcart is positioned at a test position and the secondary plug is pulled out, the fixed contact baffle is locked. The design is that the operator has opened the switch cabinet door, the breaker handcart is ready to move out of the cabinet or the necessary maintenance work of the breaker handcart in the state is ready to be carried out, and the static contact baffle plate is required to be locked in order to ensure the safety of the operator. 4. When the high-voltage busbar has a power failure, no matter where the circuit breaker handcart is located, the secondary plug is in what state, the fixed contact baffle is unlocked, an operator can further check and maintain the switch cabinet body and the fixed contact, and at the moment, no potential safety hazard exists for the operator because the high-voltage busbar is not electrified.
When the static contact baffle is unlocked under special conditions, the air switch QF is disconnected, so that the whole control loop is powered off, and the static contact baffle is unlocked.
According to the utility model, common parts such as the voltage relay YJ, the intermediate relay KA and the locking electromagnet RL are utilized, and the auxiliary contacts of the switch cabinet body are matched, so that the locking static contact isolation baffle can not be opened under the condition that the static contact or the bus of the switch cabinet is electrified, and the electrified part is isolated to prevent personnel from electric shock.
Through installing commonly used electrical components and parts additional, realize the electrified shutting function of cubical switchboard static contact, improved the factor of safety of equipment, can stop the event that the electrified static contact of touching that frequently takes place in the electric power system before in completely and cause the casualties, avoid the inside electric shock hidden danger that exists of cubical switchboard, greatly improved the security of equipment, reduced staff's risk of electrocuting, make the cubical switchboard change into essential safety type equipment. The characteristics of the operation mode of the breaker handcart in the switch cabinet are combined, and the auxiliary contacts of the breaker handcart and the auxiliary contacts of the position in the switch cabinet are utilized to flexibly control the locking loop, so that production and maintenance are realized.
The switch cabinet static contact comprises an upper static contact and a lower static contact, wherein the upper static contact and the lower static contact are both positioned on the inner side surface of the switch cabinet, and when the circuit breaker handcart is pulled out of the cabinet, the upper static contact is electrified, and the lower static contact is not electrified.
The two ends of the isolation baffle of the upper static contact and the lower static contact are arranged in the switch cabinet through guide rails, the locking electromagnet RL is positioned on the side edge of the guide rail on one side of the isolation baffle of the upper static contact, and when the locking electromagnet RL is electrified, the end head of the locking electromagnet RL extends out of the isolation baffle for blocking the upper static contact to move upwards.
The utility model adopts a mode of collecting the secondary side voltage of the voltage transformer by the voltage relay to judge whether the bus is electrified, and is suitable for a power supply system with the voltage transformer, as shown in figure 1. The high-voltage live display HL can be used for replacing the voltage relay YJ, in the circuit diagram, the voltage relay YJ is replaced by the high-voltage live display HL, the normally open contact YJ1 of the voltage relay YJ is replaced by the normally open contact HL1 of the high-voltage live display HL, and the high-voltage live display HL is suitable for a bus section of a single or no voltage transformer, as shown in fig. 3.
The foregoing embodiments are merely for illustrating the technical solution of the present utility model, but not for limiting the same, and although the present utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that modifications may be made to the technical solution described in the foregoing embodiments or equivalents may be substituted for parts of the technical features thereof, and that such modifications or substitutions do not depart from the spirit and scope of the technical solution of the embodiments of the present utility model in essence.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420868937.XU CN222146026U (en) | 2024-04-24 | 2024-04-24 | Live locking device for fixed contact baffle of switch cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420868937.XU CN222146026U (en) | 2024-04-24 | 2024-04-24 | Live locking device for fixed contact baffle of switch cabinet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN222146026U true CN222146026U (en) | 2024-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202420868937.XU Active CN222146026U (en) | 2024-04-24 | 2024-04-24 | Live locking device for fixed contact baffle of switch cabinet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN222146026U (en) |
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2024
- 2024-04-24 CN CN202420868937.XU patent/CN222146026U/en active Active
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