Circuit system of auxiliary maintenance platform for mine PJG high voltage switch

Abstract

The utility model discloses a kind of circuit system of auxiliary maintenance platform of mine PJG high-voltage switch, including three-phase input unit, step-down transformer R1, first fuse group F1, second fuse group F2, first three-phase output unit, second three-phase output unit and voltage transformer rectifier T1;Three-phase input unit is connected to the primary winding of step-down transformer R1 by circuit breaker Q1;First fuse group F1 is connected with the secondary winding of step-down transformer R1;Three-phase output unit includes quick plug terminal X4-X9, quick plug terminal X4-X9 is connected with the circuit of first fuse group F1 leading out;Second fuse group F2 is connected with the secondary winding of step-down transformer R1;The primary winding of voltage transformer rectifier T1 is connected with second fuse group F2 in series.The utility model has three-level safety protection, maintenance time is shortened by more than 40%, multi-gear power supply advantage, workshop debugging can be carried out, single detection high-explosive switch comprehensive protection and intrinsic safety controller, meet underground safety requirement.

Description

Technical Field

[0001] This utility model relates to the field of coal mine electromechanical equipment maintenance technology, and in particular to a circuit system for a mine-use PJG high-voltage switch auxiliary maintenance platform. Background Technology

[0002] In coal mine production operations, PJG high-voltage switches are core and critical equipment in the underground power supply system. Their operational stability directly determines the continuity of power supply to the mine, thus affecting the entire mine's safe production process and operational efficiency. However, mine-use high-voltage switches are exposed to the unique underground environment, characterized by high humidity, high dust levels, and explosive gases such as methane. Furthermore, the long operating cycle of these devices makes them prone to aging, leading to increased frequency of high-voltage switch failures and frequent maintenance and testing. Core control components (such as controllers) are susceptible to damage from environmental factors and frequent operation. Such damage not only disrupts the stability of the underground power supply system, creating the risk of power outages, but also requires significant manpower and time for replacement, resulting in high maintenance costs and significantly hindering normal mine production.

[0003] Currently, the maintenance of high-voltage switches in mines faces several technical bottlenecks, including:

[0004] Firstly, there is a lack of dedicated maintenance and testing platforms. Currently, most maintenance work requires maintenance personnel to operate high-voltage switches directly in the complex underground environment. The underground space is confined, lighting conditions are limited, and there is a risk of explosive gas accumulation such as methane. At the same time, operating high-voltage equipment while it is energized can easily cause electric shock accidents, resulting in prominent safety hazards during maintenance and making it difficult to guarantee the personal safety of maintenance personnel and the safety of mine operations.

[0005] Secondly, the existing testing equipment has an inadequate safety protection mechanism. The testing equipment for the maintenance of high-voltage switches in mines has not formed a multi-level protection system of "main circuit - branch circuit - intrinsically safe circuit", lacks effective overcurrent protection components and intrinsically safe power supply isolation design, and cannot meet the GB3836 series explosion-proof standards for electrical equipment used in coal mines and the requirements for underground electrical safety maintenance. During the maintenance and testing process, equipment damage or safety accidents are easily caused by circuit faults.

[0006] Third, maintenance efficiency is low. Traditional high-voltage switch maintenance equipment is bulky and complex in structure, and the circuit wiring process is cumbersome. A single maintenance requires multiple wiring and debugging operations, resulting in excessively long maintenance time for a single high-voltage switch.

[0007] Furthermore, existing intrinsically safe power supply products for mining suffer from limitations in functionality and adaptability to various scenarios. During high-voltage switch maintenance, it is necessary to simultaneously provide power support for different modules such as control circuit testing, integrated protection device display, and safety operation monitoring. However, existing intrinsically safe power supplies can only meet the power supply needs of a single module and cannot achieve coordinated power supply for multiple modules, further increasing the complexity and time cost of maintenance operations. Summary of the Invention

[0008] To address the aforementioned issues, this invention provides a circuit system for an auxiliary maintenance platform for a mining PJG high-voltage switch. This system can not only be directly connected to the high-explosive switch, but also independently test the high-explosive switch protector and display.

[0009] The technical solution adopted in this utility model is: a circuit system for an auxiliary maintenance platform for a mining PJG high-voltage switch, comprising:

[0010] The three-phase input unit includes quick-connect terminals X1, X2 and X3 for connecting to an external 380V power supply; the three-phase input unit is connected to the primary winding of the step-down transformer R1 via circuit breaker Q1.

[0011] The primary winding of the step-down transformer R1 receives AC 380V voltage, and the secondary winding outputs AC 100V voltage.

[0012] The first fuse group F1 is connected to the secondary winding of the step-down transformer R1 and is used to provide overcurrent protection for the subsequent circuit.

[0013] The first three-phase output unit includes quick-connect terminals X4, X5 and X6, which are connected to the circuit leading out from the first fuse group F1 and are used to connect to the control circuit DV1 of the high-explosive switch.

[0014] The second three-phase output unit includes quick-connect terminals X7, X8 and X9, which are connected to the circuit leading out from the first fuse group F1 and are used to connect to the high-explosive switching power supply module DV2.

[0015] The second fuse group F2 is connected to the secondary winding of the step-down transformer R1 and is used to provide overcurrent protection for the high-explosive switch integrated protection module DV3.

[0016] The transformer rectifier T1 has its primary winding connected in series with the second fuse group F2, and its secondary winding is used to connect to the high-explosive intrinsically safe controller DV4.

[0017] The primary winding of the transformer rectifier T1 receives an AC voltage of 100V, and the secondary winding outputs a DC voltage of 36V.

[0018] Furthermore, the first fuse group F1 includes three fuses, which are respectively connected to the three-phase 100V windings of the secondary side of the step-down transformer R1.

[0019] Furthermore, the second fuse group F2 includes three fuses, each connected to a corresponding three-phase circuit that supplies power to the high-explosive switch integrated protection module DV3.

[0020] The beneficial effects of this utility model are:

[0021] 1. Comprehensive safety protection: It adopts a three-level protection architecture, in which circuit breaker Q1 realizes overcurrent protection of the main circuit, and the first and second fuse groups protect the high-explosive switch control circuit and the high-explosive switch integrated protection display circuit, respectively.

[0022] 2. Improved maintenance efficiency: The high-explosive switch control circuit DV1, high-explosive switch power supply module DV2, high-explosive switch integrated protection module DV3 and high-explosive intrinsically safe controller DV4 can be quickly connected by quick-connect terminals, reducing the number of wiring operations and solving the problem of cumbersome operation of traditional maintenance equipment. Actual tests have shown that the maintenance time of a single high-voltage switch can be shortened by more than 40%.

[0023] 3. Strong power supply adaptability: The voltage conversion from 380V to 100V is achieved through the step-down transformer R1 to meet the voltage requirements of the high-explosive switch control circuit DV1 and the high-explosive switch power supply module DV2. Then, the voltage is stepped down to 36V intrinsically safe voltage by the transformer rectifier T1, forming a multi-level voltage output system to adapt to the power supply needs of different maintenance scenarios. Attached Figure Description

[0024] Figure 1 This is the circuit schematic diagram of this utility model. Detailed Implementation

[0025] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort. To facilitate understanding of this utility model, a more detailed description of this utility model will be provided below in conjunction with the accompanying drawings and specific embodiments.

[0026] like Figure 1 As shown, this utility model is a circuit system for an auxiliary maintenance platform for a mining PJG high-voltage switch, including a three-phase input unit, a step-down transformer R1, a high-explosive switch control circuit DV1, a high-explosive switch power supply module DV2, a high-explosive switch integrated protection module DV3, a transformer rectifier T1, and a high-explosive intrinsically safe controller DV4.

[0027] The three-phase input unit uses three quick-connect terminals X1, X2 and X3 to connect to a 380V three-phase power supply. The circuit breaker Q1 controls the on / off state of the main circuit and provides overcurrent protection. When the input current exceeds the rated value, the circuit breaker Q1 will automatically trip within 0.5 seconds, cutting off the power supply circuit.

[0028] The step-down transformer R1 is a three-phase dry-type isolation transformer with a primary winding rated voltage of 380V and a secondary winding output of 100V three-phase voltage. These are used for normal detection of the high-explosive switch, indication of the circuit breaker's engagement / disengagement within the high-explosive switch, and to provide power to the high-explosive switch. The output terminal of the secondary winding of the step-down transformer R1 is connected to the first fuse group F1, providing overcurrent protection for the subsequent high-explosive switch control circuit DV1 and the high-explosive switch power supply module DV2.

[0029] The downstream circuits of the first fuse group F1 are connected to the first three-phase output unit and the second three-phase output unit, respectively. The first three-phase output unit includes quick-connect terminals X4, X5, and X6, which are used to connect to the high-explosive switch control circuit DV1. This circuit includes a relay group simulating the operation of the high-explosive switch and a test interface, which can simulate opening and closing operations. The second three-phase output unit includes quick-connect terminals X7, X8, and X9, which are connected to the power supply side of the high-explosive switch power supply module DV2. The load side of the high-explosive switch power supply module DV2 is equipped with indicator lights H1 and H2 to determine the engagement status of the high-explosive switch.

[0030] The second fuse group F2 is also connected to the output terminal of the secondary winding of the step-down transformer R1. The subsequent circuit is used to connect the high-explosive switch integrated protection module DV3, which can be separately removed and used for maintenance and testing of the high-explosive switch integrated protection module DV3 and its integrated protection display.

[0031] The primary winding of transformer rectifier T1 is connected in series with the second fuse group F2 to output a DC voltage of 36V, which is used to connect to the intrinsically safe high-explosive controller DV4. The intrinsically safe high-explosive controller DV4 can be repaired and tested by removing it separately.

[0032] Furthermore, the outer casing housing this utility model is made of insulating material, which isolates the operator from the live parts and effectively protects the operator's safety; it also allows the high-explosive switch to be tested and debugged in the workshop, and the integrated protection module and intrinsically safe controller of the high-explosive switch can be removed separately for maintenance and testing, solving the problem of difficult testing and maintenance of high-explosive switches.

[0033] The various embodiments described in this specification are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above description of the disclosed embodiments enables those skilled in the art to implement or use this invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this invention. Therefore, this invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A circuit system for an auxiliary maintenance platform for a mining PJG high-voltage switch, characterized in that, include: The three-phase input unit includes quick-connect terminals X1, X2 and X3 for connecting to an external 380V power supply; the three-phase input unit is connected to the primary winding of the step-down transformer R1 via circuit breaker Q1. The primary winding of the step-down transformer R1 receives AC 380V voltage, and the secondary winding outputs AC 100V voltage. The first fuse group F1 is connected to the secondary winding of the step-down transformer R1 and is used to provide overcurrent protection for the subsequent circuit. The first three-phase output unit includes quick-connect terminals X4, X5 and X6, which are connected to the circuit leading out from the first fuse group F1 and are used to connect to the control circuit DV1 of the high-explosive switch. The second three-phase output unit includes quick-connect terminals X7, X8 and X9, which are connected to the circuit leading out from the first fuse group F1 and are used to connect to the high-explosive switching power supply module DV2. The second fuse group F2 is connected to the secondary winding of the step-down transformer R1 and is used to provide overcurrent protection for the high-explosive switch integrated protection module DV3. The transformer rectifier T1 has its primary winding connected in series with the second fuse group F2, and its secondary winding is used to connect to the high-explosive intrinsically safe controller DV4. The primary winding of the transformer rectifier T1 receives an AC voltage of 100V, and the secondary winding outputs a DC voltage of 36V.

2. The circuit system of the auxiliary maintenance platform for a mining PJG high-voltage switch according to claim 1, characterized in that, The first fuse group F1 includes three fuses, which are respectively connected to the three-phase 100V windings of the secondary side of the step-down transformer R1.

3. The circuit system of the auxiliary maintenance platform for a mining PJG high-voltage switch according to claim 1, characterized in that, The second fuse group F2 includes three fuses, each connected to a corresponding three-phase circuit that supplies power to the high-explosive switch integrated protection module DV3.

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