Safety interlocking device for low-voltage substation transformer system

Abstract

The utility model discloses a low pressure plant change system safety interlocking device relates to electric power automation technical field, including: circuit breaker locking module is set up on 6kV high voltage side circuit breaker and 400V low voltage side circuit breaker, cabinet door locking module is set up on transformer high / low voltage side cabinet door and temporary earthing point box, key exchange box is connected with circuit breaker locking module and cabinet door locking module, the utility model discloses a mechanical interlocking slider has realized " power off - take key - open door - ground " the irreversible flow, and through two exchange three key exchange box, the multi - step operation is simplified as single - action, thereby not only can shorten the power - off time, can also eliminate the possibility of human skipping security step from the physical level.

Description

Technical Field

[0001] The present utility model relates to the technical field of electric power automation, in particular to a safety interlock device for a low-voltage plant transformer system. Background Art

[0002] In modern power systems, low-voltage service transformers are an important part of the service power system of power plants and large industrial and mining enterprises. The safety and reliability of their operation are directly related to the stability and continuity of the entire power supply system. And with the continuous improvement of industrial automation level, higher requirements have been put forward for the operation safety, fault response speed and intelligent operation and maintenance of electrical equipment.

[0003] Traditional low-voltage plant transformer systems usually adopt measures such as mechanical locking, electromagnetic locking or program locking to prevent misoperation and ensure equipment safety. However, these traditional methods have many limitations, such as fixed locking logic, reliance on manual judgment, slow response speed, complex maintenance and other problems, which are difficult to meet the requirements of increasingly complex operating conditions and multi-device linkage control.

[0004] Meanwhile, in the actual operation process, due to operator error, equipment aging or untimely protection action and other reasons, it may lead to serious accidents such as false opening and closing of circuit breakers, live operation of disconnecting switches, wrong closing of grounding switches, and further cause unplanned outages, equipment damage and even personal safety accidents. Therefore, there is an urgent need for a safety interlock device capable of realizing automatic judgment, intelligent interlocking and rapid response to improve the operation safety and operation reliability of low-voltage plant transformer systems. Contents of the Utility Model

[0005] The purpose of the present utility model is to provide a safety interlock device for a low-voltage plant transformer system to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present utility model provides the following technical solution: a safety interlock device for a low-voltage plant transformer system, comprising:

[0007] A circuit breaker locking module arranged on the 6kV high-voltage side circuit breaker and the 400V low-voltage side circuit breaker;

[0008] A cabinet door locking module arranged on the high / low voltage side cabinet door of the transformer and the temporary grounding point box;

[0009] A key exchange box connected to both the circuit breaker locking module and the cabinet door locking module.

[0010] Further, the key exchange box is provided with a first key slot and a second key slot, the first key slot is connected to the circuit breaker locking module, the second key slot is connected to the cabinet door locking module, and the first key slot and the second key slot are connected to each other through a mechanical interlock slider.

[0011] Furthermore, the circuit breaker interlocking module and the cabinet door interlocking module exchange keys via a key exchange box.

[0012] Furthermore, the key in the circuit breaker interlocking module is connected to the circuit breaker's operating handle via a latch.

[0013] Furthermore, there are two first key slots, and the circuit breaker interlocking module includes key A1 and key A2. Key A1 is installed on the 400V low-voltage side circuit breaker, and key A2 is installed on the 6kV high-voltage side circuit breaker. The two first key slots are configured in a one-to-one correspondence with key A1 and key A2.

[0014] Furthermore, there are three second key slots, and the cabinet door locking module includes key A3, key A4 and key A5. Key A3 is installed on the high-voltage side cabinet door of the transformer, key A4 is installed on the low-voltage side cabinet door of the transformer, and key A5 is installed on the temporary grounding point box. The three second key slots are configured in a one-to-one correspondence with key A3, key A4 and key A5.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This utility model realizes the irreversible process of "power outage - key retrieval - door opening - grounding" through a mechanical interlocking slider, and simplifies the multi-step operation into a single action through a two-to-three key exchange box. This not only shortens the power outage time, but also eliminates the possibility of human intervention in skipping safety steps from a physical perspective. Attached Figure Description

[0017] Figure 1 This is a circuit diagram of the safety interlocking device for low-voltage plant transformer systems according to this utility model. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] refer to Figure 1This embodiment provides a safety interlocking device for a low-voltage transformer system. The device includes a circuit breaker interlocking module, a cabinet door interlocking module, and a key exchange box. The circuit breaker interlocking module is installed on the 6kV high-voltage side circuit breaker and the 400V low-voltage side circuit breaker. The cabinet door interlocking module is installed on the high / low voltage side cabinet door and the temporary grounding point box of the transformer. The circuit breaker interlocking module and the cabinet door interlocking module are connected via the key exchange box.

[0020] Furthermore, the key exchange box is equipped with two first key slots and three second key slots. The first and second key slots are connected by a mechanical interlocking slider. This means that only when keys are inserted into both first key slots can the keys in the three second key slots be released from their positions and removed.

[0021] In this embodiment, the first key slot is connected to the key in the circuit breaker interlocking module, meaning the circuit breaker interlocking module has two keys. Specifically, the circuit breaker interlocking module includes key A1 and key A2, where key A1 is installed on the 400V low-voltage side circuit breaker and key A2 is installed on the 6kV high-voltage side circuit breaker. The two first key slots correspond one-to-one with keys A1 and A2. It is worth noting that both keys A1 and A2 are connected to the circuit breaker's operating handle via a latch. Specifically, the extension and retraction of keys A1 and A2 are linked to the mechanical position of the circuit breaker; that is, when the circuit breaker is in the operating position, the latch extends and prevents keys A1 and A2 from being pulled out.

[0022] Furthermore, the second key slot connects to the key in the cabinet door locking module, meaning the cabinet door locking module has three keys. Specifically, the cabinet door locking module includes keys A3, A4, and A5. Key A3 is located on the high-voltage side cabinet door of the transformer, key A4 is located on the low-voltage side cabinet door of the transformer, and key A5 is located on the temporary grounding box. The three second key slots correspond one-to-one with keys A3, A4, and A5. It is important to note that keys A3, A4, and A5 are initially locked in their respective second key slots, meaning they cannot be removed. In this embodiment, the circuit breaker interlocking module and the cabinet door interlocking module exchange keys via a key exchange box. That is, when both keys A1 and A2 are inserted into their respective first key slots, the mechanical interlock slider will move downwards, releasing keys A3, A4, and A5, and locking keys A1 and A2. Keys A3, A4, and A5 can then be removed, while keys A1 and A2 cannot. Similarly, when keys A3, A4, and A5 are inserted into their respective second key slots, keys A1 and A2 can be removed, while keys A3, A4, and A5 will be locked.

[0023] During the implementation process, after disconnecting the 400V low-voltage side circuit breaker and pulling it to the preset test position, the key A1 on the 400V low-voltage side circuit breaker can be rotated and pulled out, thus locking the 400V low-voltage side circuit breaker in the open state. Similarly, after disconnecting the 6kV high-voltage side circuit breaker and pulling it to the preset test position, the key A2 on the 6kV high-voltage side circuit breaker can be rotated and pulled out, thus locking the 6kV high-voltage side circuit breaker in the open state.

[0024] To elaborate further, after inserting keys A1 and A2 into their respective first key slots, keys A3, A4, and A5 can be retrieved. These keys are then inserted into the high-voltage side cabinet door, the low-voltage side cabinet door, and the temporary grounding box of the transformer, respectively. Simultaneously, keys A3, A4, and A5 are used to open the high / low-voltage side cabinet doors and the temporary grounding box, respectively, allowing for transformer inspection and maintenance. It is important to note that once the doors are opened, keys A3, A4, and A5 cannot be removed.

[0025] Furthermore, only after both the high-voltage and low-voltage side cabinet doors of the transformer are closed and the grounding wire is removed can keys A3, A4, and A5 be pulled out. At the same time, keys A3, A4, and A5 can be inserted into the three corresponding second key slots to replace keys A1 and A2. Then, keys A1 and A2 can be inserted into the 400V low-voltage side circuit breaker and the 6kV high-voltage side circuit breaker, respectively, to open the 400V low-voltage side circuit breaker and the 6kV high-voltage side circuit breaker, thereby restoring power supply.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended embodiments and their equivalents.

Claims

1. A safety interlocking device for a low-voltage plant transformer system, characterized in that, Including: A circuit breaker interlocking module is installed on a 6kV high-voltage side circuit breaker and a 400V low-voltage side circuit breaker. The key in the circuit breaker interlocking module is connected to the operating handle of the circuit breaker through a locking tongue. The cabinet door interlocking module is installed on the high / low voltage side cabinet door and the temporary grounding point box of the transformer. The key exchange box is connected to both the circuit breaker interlocking module and the cabinet door interlocking module. The key exchange box is provided with a first key slot and a second key slot. The first key slot is connected to the circuit breaker interlocking module, and the second key slot is connected to the cabinet door interlocking module. At the same time, the first key slot and the second key slot are connected by a mechanical interlocking slider. There are two first key slots. The circuit breaker interlocking module includes key A1 and key A2. Key A1 is set on the 400V low-voltage side circuit breaker and key A2 is set on the 6kV high-voltage side circuit breaker. The two first key slots are set one-to-one with key A1 and key A2. There are three second key slots. The cabinet door locking module includes key A3, key A4 and key A5. Key A3 is set on the high-voltage side cabinet door of the transformer, key A4 is set on the low-voltage side cabinet door of the transformer, and key A5 is set on the temporary grounding point box. The three second key slots are set one-to-one with key A3, key A4 and key A5.

2. The safety interlocking device for low-voltage plant transformer systems according to claim 1, characterized in that, The circuit breaker interlocking module and the cabinet door interlocking module exchange keys via a key exchange box.

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