CN222464161U

CN222464161U - An improved PT monitoring switching device in a mine flameproof high voltage power distribution device

Info

Publication number: CN222464161U
Application number: CN202420788580.4U
Authority: CN
Inventors: 万孟合; 李山; 罗晓军; 李光荣; 丁志东; 林子俊
Original assignee: Guoneng Ordos Engineering Design Co ltd
Current assignee: Guoneng Ordos Engineering Design Co ltd
Priority date: 2024-04-16
Filing date: 2024-04-16
Publication date: 2025-02-11
Anticipated expiration: 2034-04-16

Abstract

The utility model discloses an improved PT monitoring switching device in a flameproof high-voltage power distribution device for mining, which also includes an intermediate relay, a voltage relay, a knob switch and a signal indicator light. The coil of the voltage relay is respectively connected between the AB phase, BC phase and LN phase of the secondary side of the PT of the circuit breaker; the auxiliary normally open contact of the voltage relay and the knob switch are connected in parallel, and then connected in series with the coil of the intermediate relay between the AB phase of the secondary side of the PT of the circuit breaker; the auxiliary normally open contact of the intermediate relay and the signal indicator light are connected in series between the AB phase of the secondary side of the PT of the circuit breaker; the auxiliary normally open contact of the intermediate relay is connected in series to the busbar dedicated PT circuit; the auxiliary normally closed contact of the intermediate relay is connected in series to the circuit breaker's own PT circuit. The advantages are: the high-voltage circuit breaker's own PT can be switched with the busbar dedicated PT, and the fault monitoring function of the circuit breaker's own PT can be realized, thereby improving the power supply reliability.

Description

PT monitoring switching device in improved mining flame-proof high-voltage distribution device

Technical field:

The utility model relates to the field of mining flameproof high-voltage power distribution devices, in particular to an improved PT monitoring switching device in a mining flameproof high-voltage power distribution device.

The background technology is as follows:

At present, in order to be convenient to use, each high-voltage breaker feed-out cabinet is provided with PT, and the fuse-contactor loop is not provided with PT due to insufficient space in the cabinet, when the high-voltage distribution device is fixedly arranged in a coal mine underground substation, a special PT cabinet is required to be arranged on a high-voltage bus to adapt to the needs of various feed-out cabinets, and the wiring mode mainly has the following defects that (1) a PT parallel switching function is arranged between the special PT cabinets of the bus, but the parallel switching between the PT device signal wires of the special PT device of the circuit breaker cannot be realized due to the fact that the PT device signal wires of the special PT device are not led from the PT of the bus, and (2) once the problem occurs in the self-carrying PT of the breaker feed-out cabinet, the special PT signal of the bus cannot be found and put into in time, so that the power supply reliability is affected.

The utility model comprises the following steps:

The utility model aims to provide an improved PT monitoring switching device in a mining flameproof high-voltage distribution device, which aims to solve the problems and the defects. The device greatly improves the safety and reliability of the underground coal mine power supply system.

The utility model is implemented by the following technical scheme that the PT monitoring switching device in the improved mining explosion-proof high-voltage distribution device further comprises an intermediate relay, three voltage relays, a knob switch and a signal indicator lamp, wherein coils of the three voltage relays are respectively connected between a secondary side AB phase, a BC phase and an LN phase of a breaker self-carrying PT, auxiliary normally open contacts of the three voltage relays and the knob switch are connected in parallel and then are connected in series with the coils of the intermediate relay between the secondary side AB phase of the breaker self-carrying PT, one auxiliary normally open contact of the intermediate relay and the signal indicator lamp are connected in series between the secondary side AB phase of the breaker self-carrying PT, four auxiliary normally open contacts of the intermediate relay are connected in series to a special PT circuit of a bus, and four auxiliary normally open contacts of the intermediate relay are connected in series to the breaker self-carrying PT circuit.

The utility model has the advantages that the high-voltage circuit breaker with PT can be switched with the special PT of the bus, the fault monitoring function of the circuit breaker with PT can be realized, and the power supply reliability is improved.

Description of the drawings:

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic circuit diagram of the present utility model.

Fig. 2 is a schematic diagram of a parallel circuit of the circuit breaker feed-out cabinet PT of the present utility model.

In the figure, a normally-open contact of a 1 'intermediate relay, a normally-closed contact of a 1' 'intermediate relay, a 2, a voltage relay, a normally-closed contact of a 2' voltage relay, a 3, a voltage relay, a normally-closed contact of a 3 'voltage relay, a 4, a voltage relay, a normally-closed contact of a 4' voltage relay, a 5, a knob switch, a 6 and a signal indicator.

The specific embodiment is as follows:

the following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but 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.

Referring to fig. 1 to 2, the PT monitoring switching device in the improved mining flameproof high-voltage distribution device comprises a special PT for a bus, a breaker self-carrying PT, a 110V intermediate relay 1, a DY-36/160V voltage relay 2, a DY-36/160V voltage relay 3, a DY-36/160V voltage relay 4, a knob switch 5 and a 110V signal indicator lamp 6, wherein coils of the voltage relay 2, the voltage relay 3 and the voltage relay 4 are respectively connected between a secondary side AB phase, a BC phase and an LN phase of the breaker self-carrying PT, an auxiliary normally-open contact 2', a normally-closed contact 3', a normally-closed contact 4' of the voltage relay 3 and the voltage relay 4 corresponding to the voltage relay 4 are connected in parallel and then connected with the coil of the intermediate relay 1 in series between the secondary side AB phase of the breaker self-carrying PT, an auxiliary normally-open contact 1' of the intermediate relay 1 and a signal indicator lamp 6 are respectively connected between the secondary side AB phase of the breaker self-carrying PT, and the auxiliary normally-closed contacts 1' of the intermediate relay 1 are connected in series between the four auxiliary normally-closed contacts of the breaker self-carrying PT and the auxiliary loop 1.

The manual switching between the self-contained PT and the special PT of the bus can be realized by rotating the knob switch 5. No matter any point of the AB phase, the BC phase and the LN phase of the secondary side with the PT has voltage abnormality, the intermediate relay 1 can act through the auxiliary normally open contact of the voltage relay, and then the PT loop special for the bus is switched. The high-voltage circuit breaker is fed out from the PT cabinet, can be switched with the PT cabinet special for the bus, can realize the fault monitoring function of the PT cabinet, and improves the power supply reliability.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims

1. The PT monitoring switching device in the improved mining explosion-proof high-voltage distribution device is characterized by comprising an intermediate relay, three voltage relays, a knob switch and a signal indicator lamp, wherein coils of the three voltage relays are respectively connected among a secondary side AB phase, a BC phase and an LN phase of a breaker with PT, auxiliary normally open contacts of the three voltage relays and the knob switch are connected in parallel and then are connected in series with the coils of the intermediate relay between the secondary side AB phase of the breaker with PT, one auxiliary normally open contact of the intermediate relay and the signal indicator lamp are connected in series between the secondary side AB phase of the breaker with PT, four auxiliary normally open contacts of the intermediate relay are connected in series to a special PT loop of a bus, and four auxiliary normally closed contacts of the intermediate relay are connected in series to the breaker with PT loop.