Mining control power supply independent switching system

Abstract

The utility model discloses an independent switching system for a mining control power supply. The independent switching system comprises fuses 1FU, 2FU, 3FU and 4FU, a contactor type intermediate relay KA1, an I-section wire inlet frame circuit breaker QF1, an II-section wire inlet frame circuit breaker QF2, an isolation transformer NDK and a cabinet top miniature bus. The mining power distribution cabinet has the characteristics of simple structure, reliable operation, strong practicability and low cost, solves the problem of complex switching of control power supply loops between two sections of mining power distribution cabinets in the prior art, realizes the functions of low cost and reliable operation, and meets the requirement of switching accuracy of the control power supply loops between the two sections of mining power distribution cabinets.

Description

Technical Field

[0001] The utility model belongs to the technical field of mine control equipment, in particular to an independent switching system for mine control power supply. Background Art

[0002] With the continuous updating and development of modern electrical products, people's production and life are using electricity more and more widely and their dependence is getting higher and higher. How to maintain the uninterrupted power supply has gradually become more important to people, and it is also directly related to the safety of people's lives and property.

[0003] The traditional control power switching device requires the installation of independent power transformers and contactor-type intermediate relays for switching power supplies and related knob switches in the two-section mining power distribution cabinets. Operators are required to go to the site to switch the control power supply according to the actual power supply conditions. Therefore, the control power switching device has problems such as poor safety and reliability, high failure rate, inconvenient troubleshooting, and complex replacement. It not only increases the production cost of the enterprise, but also has high requirements for user maintenance capabilities, and cannot well meet the requirements of maintaining uninterrupted power supply.

[0004] With the development of power technology, people have higher and higher requirements for the uninterrupted power supply. People's production and life use electricity more and more widely, and their dependence on electricity is getting higher and higher. How to maintain the uninterrupted power supply has gradually become more important to people, and it is also directly related to the safety of people's lives and property. Utility Model Content

[0005] The purpose of the utility model is to improve the deficiencies of the prior art and provide an independent switching system for a control power supply mainly used in mines, so as to realize reliable switching of the control power supply and meet the diversified control requirements of the control power supply.

[0006] The purpose of the utility model is achieved in this way. A mine control power supply independent switching system is characterized by including fuses 1FU, 2FU, 3FU, 4FU, contactor-type intermediate relay KA1, I section incoming frame circuit breaker QF1, II section incoming frame circuit breaker QF2, isolation transformer NDK, cabinet top small busbar, wherein:

[0007] The contactor-type intermediate relay KA1 is used to switch between the section I incoming line control power supply and the section II incoming line control power supply. The contactor-type intermediate relay coil is connected to the power supply side of the section I incoming line cabinet. When there is power on the power supply side of the section I incoming line cabinet, the contactor-type intermediate relay coil is energized and its internal normally open contacts are closed and the normally closed contacts are opened, so that the control power is provided by the section I incoming line power supply side.

[0008] The I-section incoming line frame circuit breaker QF1 serves as the main power supply and is connected to the contactor-type intermediate relay coil;

[0009] The section II incoming line frame circuit breaker QF2 is used as a backup power supply for backup switching of the incoming line control power supply;

[0010] The isolation transformer NDK is used to transmit the converted power to the small busbar on the top of the cabinet shared by the two sections of mining power distribution cabinets.

[0011] The small busbar on the cabinet top is used to provide power for two sections of control circuits of the mining power distribution cabinet.

[0012] In order to further achieve the purpose of the present invention, the A end of the molded case circuit breaker QF1 can be connected in series with the 1 and 2 ends of the fuse 1FU, the 13 and 14 ends of the intermediate relay KA1, and the 14 end of the intermediate relay KA1 is connected to the 1 end of the transformer NDK; the C end of the molded case circuit breaker QF1 is connected in series with the 1 and 2 ends of the fuse 3FU, the 33 and 34 ends of the intermediate relay KA1, and the 34 end of the intermediate relay KA1 is connected to the 0 end of the transformer NDK; the A end of the molded case circuit breaker QF2 is connected in series with the fuse 2F Terminals 1 and 2 of U, terminals 21 and 22 of intermediate relay KA1, and terminal 22 of intermediate relay KA1 are connected to terminal 14 of intermediate relay KA1; terminal C of molded case circuit breaker QF2 is connected in series with terminals 1 and 2 of fuse 4FU, terminals 41 and 42 of intermediate relay KA1, and terminal 42 of intermediate relay KA1 is connected to terminal 34 of intermediate relay KA1; A1 of intermediate relay KA1 is connected to terminal 2 of fuse 1FU, and A2 of intermediate relay KA1 is connected to terminal 2 of fuse 3FU; terminal L of transformer NDK is connected to the live wire of the cabinet top busbar, and terminal N of transformer NDK is connected to the neutral wire of the cabinet top busbar.

[0013] Compared with the existing technology, the present invention has the following significant features and positive effects: the present invention has the characteristics of simple structure, reliable operation, strong practicality and low cost. The present invention is designed for the control power supply of two-stage power distribution cabinets for mines, and has many advantages such as standardization, low energy consumption, convenient installation, convenient maintenance, cost saving, safety and reliability, and is easy to popularize and promote. The present invention is mainly applicable to the field of power distribution cabinets for mines. The main function is to realize the reliable switching of the control power supply of two-stage power distribution cabinets for mines. When a fault occurs on the power supply side of the I-stage incoming line cabinet, the coil of the contactor-type intermediate relay loses power, and the normally open contacts inside the contactor-type intermediate relay are disconnected and the normally closed contacts are closed. The utility model takes a simple contactor-type intermediate relay as its core, connects to the power supply side of the I-section incoming frame circuit breaker through a fuse, and determines whether the I-section incoming frame circuit breaker has power through the coil of the contactor-type intermediate relay. When the power supply side of the I-section incoming frame circuit breaker has power, the auxiliary contacts in the contactor-type intermediate relay will make corresponding conversions to connect the corresponding control power supply, thereby realizing the switching of the control power supply. The utility model is an economical and reliable control system with broad application prospects in the mining field. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a principle block diagram of the utility model.

[0015] Figure 2 It is a structural schematic diagram of the present utility model. DETAILED DESCRIPTION

[0016] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0017] A mine control power supply independent switching system, refer to Figure 1 , including fuses 1FU, 2FU, 3FU, 4FU, contactor-type intermediate relay KA1, section I incoming frame circuit breaker QF1, section II incoming frame circuit breaker QF2, isolation transformer NDK, cabinet top busbar, including:

[0018] The contactor-type intermediate relay KA1 is used to switch the control power supply of the incoming line of section I and section II. When both the power supply sides of the incoming line cabinet of section I and section II are powered, the coil of the contactor-type intermediate relay is connected to the power supply side of the incoming line cabinet of section I through fuses 1FU and 3FU. The coil of the contactor-type intermediate relay is energized, and its internal normally open contact is energized and changes from normally open to normally closed, and the normally closed contact is energized and changes from normally closed to normally open. At this time, the control power supply of the two-section power distribution cabinet for the mine is transmitted from the incoming line cabinet of section I to the isolation transformer. When the power supply side of the incoming line cabinet of section I loses power, the coil of the contactor-type intermediate relay loses power, and its internal normally open contact is energized and changes from open to open, and the normally closed contact is energized and changes from open to energized. At this time, the control power supply of the two-section power distribution cabinet for the mine is transmitted from the incoming line cabinet of section II to the isolation transformer.

[0019] The I-section incoming line frame circuit breaker QF1 serves as the main power supply and is connected to the contactor-type intermediate relay coil;

[0020] The section II incoming line frame circuit breaker QF2 is used as a backup power supply for backup switching of the incoming line control power supply;

[0021] The isolation transformer NDK is used to transmit the converted power to the small busbar on the top of the cabinet shared by the two sections of mining power distribution cabinets.

[0022] The small busbar on the cabinet top is used to connect two sections of the control circuit of the mining power distribution cabinet to provide power for them.

[0023] A specific embodiment of the utility model is as follows: the A terminal of the molded case circuit breaker QF1 is connected to the 1 terminal of the fuse 1FU, the 2 terminal of the fuse 1FU is connected to the 13 terminal and the A1 terminal of the intermediate relay KA1, and the 14 terminal of the intermediate relay KA1 is connected to the 1 terminal of the transformer NDK; the C terminal of the molded case circuit breaker QF1 is connected to the 1 terminal of the fuse 3FU, the 2 terminal of the fuse 3FU is connected to the 33 and A2 terminals of the intermediate relay KA1, and the 34 terminal of the intermediate relay KA1 is connected to the 0 terminal of the transformer NDK; the A terminal of the molded case circuit breaker QF2 is connected to the fuse 2F Terminal 1 of U and terminal 2 of fuse 2FU are connected to terminal 21 of intermediate relay KA1, and terminal 22 of intermediate relay KA1 is connected to terminal 14 of intermediate relay KA1; terminal C of molded case circuit breaker QF2 is connected to terminal 1 of fuse 4FU, terminal 2 of fuse 4FU is connected to terminal 41 of intermediate relay KA1, and terminal 42 of intermediate relay KA1 is connected to terminal 34 of intermediate relay KA1; A1 of intermediate relay KA1 is connected to terminal 2 of fuse 1FU, and A2 of intermediate relay KA1 is connected to terminal 2 of fuse 3FU; terminal L of transformer NDK is connected to the live wire of the cabinet top busbar, and terminal N of transformer NDK is connected to the neutral wire of the cabinet top busbar.

[0024] In this embodiment, the models of fuses 1FU, 2FU, 3FU, and 4FU are RT18-32 series, the model of contactor-type intermediate relay KA1 is JZC1-22 series, the model of section I incoming line frame circuit breaker QF1 and section II incoming line frame circuit breaker QF2 are NDW3 series, and the model of isolation transformer NDK is NDK series.

Claims

1. A mine control power supply independent switching system, characterized by It includes fuses 1FU, 2FU, 3FU, 4FU, contactor-type intermediate relay KA1, section I incoming line frame circuit breaker QF1, section II incoming line frame circuit breaker QF2, isolation transformer NDK, and cabinet top busbar. The fuses 1FU, 2FU, 3FU, and 4FU are used for control loop current protection. When the current is too large, the fuses will blow to protect other components in the loop. The contactor-type intermediate relay KA1 is used to switch between the section I incoming line control power supply and the section II incoming line control power supply. The contactor-type intermediate relay coil detects that there is power in the section I incoming line cabinet, and the internal normally open contacts and normally closed contacts are switched to connect the power circuit. The I-section incoming line frame circuit breaker QF1 serves as the main power supply and is connected to the contactor-type intermediate relay coil; The section II incoming line frame circuit breaker QF2 is used as a backup power supply for backup switching of the incoming line control power supply; The isolation transformer NDK is used to transmit the converted power to the small busbar on the top of the cabinet shared by the two sections of mining power distribution cabinets, providing control power for the two sections of mining power distribution cabinets; The small busbar on the cabinet top is used to provide power for two sections of control circuits of the mining power distribution cabinet.

2. The mine control power supply independent switching system according to claim 1 is characterized in that: The A end of the molded case circuit breaker QF1 is connected in series with the 1 and 2 ends of the fuse 1FU, the 13 and 14 ends of the intermediate relay KA1, and the 14 end of the intermediate relay KA1 is connected to the 1 end of the transformer NDK; the C end of the molded case circuit breaker QF1 is connected in series with the 1 and 2 ends of the fuse 3FU, the 33 and 34 ends of the intermediate relay KA1, and the 34 end of the intermediate relay KA1 is connected to the 0 end of the transformer NDK; the A end of the molded case circuit breaker QF2 is connected in series with the 1 and 2 ends of the fuse 2FU, the intermediate relay KA1, and the 14 end of the intermediate relay KA1 is connected to the 0 end of the transformer NDK. Terminals 21 and 22 of relay KA1 and terminal 22 of intermediate relay KA1 are connected to terminal 14 of intermediate relay KA1; terminal C of molded case circuit breaker QF2 is connected in series with terminals 1 and 2 of fuse 4FU, terminals 41 and 42 of intermediate relay KA1, and terminal 42 of intermediate relay KA1 is connected to terminal 34 of intermediate relay KA1; A1 of intermediate relay KA1 is connected to terminal 2 of fuse 1FU, and A2 of intermediate relay KA1 is connected to terminal 2 of fuse 3FU; terminal L of transformer NDK is connected to the live wire of the cabinet top busbar, and terminal N of transformer NDK is connected to the neutral wire of the cabinet top busbar.

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