CN201877786U

CN201877786U - Undervoltage release protection device

Info

Publication number: CN201877786U
Application number: CN2010206720450U
Authority: CN
Inventors: 常杰; 孔文军
Original assignee: Shanxi Jincheng Anthracite Mining Group Co Ltd
Current assignee: Shanxi Jincheng Anthracite Mining Group Co Ltd
Priority date: 2010-12-21
Filing date: 2010-12-21
Publication date: 2011-06-22
Anticipated expiration: 2020-12-21

Abstract

The utility model discloses an undervoltage release protection device, which comprises a rectification circuit connected with an external circuit, wherein a tripping coil YA is connected in series between the output ends of the rectification circuit, both ends of the tripping coil are connected in parallel with time delay capacitors C, a time relay SJ is also connected onto the external circuit, and a contact SJI of the time relay SJ is connected with the tripping coil YA. After the electric network voltage fluctuates, although the output voltage of the rectification circuit is reduced, the action of the SJI auxiliary contact delays after the action of the time relay SJ, and the tripping coil is charged through the capacitors C to maintain the normal operation state of the tripping coil YA. When the undervoltage is too long, the tripping coil YA normally carries out tripping operation. The undervoltage release protection device has the advantages that the non-fault circuit has delay action, the momentary fluctuation of the voltage is avoided, the switch misoperation caused by voltage fluctuation is avoided, the occurrence of large-area wind stop and power failure accidents is avoided, in addition, the structure is simple, the operability is strong, and the action is reliable.

Description

Under-voltage release guard device

Technical field

The utility model relates to a kind of high voltage flame proof switch, especially a kind of high voltage flame proof switch with under-voltage release guard effect.

Background technology

Huge day by day along with the lifting of mine capacity and electric power system scale; accident of power supply can't definitely be avoided; the present high voltage flame proof switch of using of magneto; as shown in Figure 1; has only a moving component during work; it is no decompression coil in the closing circuit; when accident of being short-circuited and unknown cause line voltage unexpected fluctuation; because voltage instantaneous reduces under-voltage release guard (being the decompression coil) the non-selectivity action that causes high voltage flame proof switch inside; and then cause the generation of mine large tracts of land blowing-out power outage, the safety of serious threat mine.

Summary of the invention

Technical problem to be solved in the utility model provides a kind of under-voltage release guard device.

Overcome the above problems; a kind of under-voltage release guard device described in the utility model; comprise the rectification circuit that is connected with external circuit; be serially connected with tripping coil YA between the output of rectification circuit; at the two ends of tripping coil delay capacitor C in parallel; also be connected with time relay sj on the external circuit, the contact SJI of time relay sj is connected with tripping coil YA.Behind the voltage ripple of power network, though Output Voltage in Rectified Circuits reduces, after the time relay sj action, the deferred action of SJI auxiliary contact is charged to it by capacitor C, keeps tripping coil YA normal operating condition.As under-voltage overlong time, then tripping coil YA normally trips.

Compared with prior art, the utility model makes non-fault line deferred action, escapes the transient fluctuation of voltage, avoids the switch misoperation that causes because of voltage fluctuation, and stopped large tracts of land blowing-out power outage and taken place, and also simple in structure, strong operability, reliable in action.

Description of drawings

Fig. 1 is the circuit theory diagrams before improving.

Fig. 2 is circuit theory diagrams of the present utility model.

Embodiment

Below in conjunction with accompanying drawing the utility model is described further.

As shown in Figure 2; described in the utility model. a kind of under-voltage release guard device; comprise the rectification circuit that is connected with external circuit; be serially connected with tripping coil YA between the output of rectification circuit;: at the two ends of tripping coil delay capacitor C in parallel; also be connected with time relay sj on the external circuit, the contact SJI of time relay sj is connected with tripping coil YA.When switch was transformed, line voltage had fluctuation slightly, and tripping coil YA voltage promptly reduces,

Behind the voltage ripple of power network, though Output Voltage in Rectified Circuits reduces, after the time relay sj action, the deferred action of SJI auxiliary contact is charged to it by capacitor C, keeps tripping coil YA normal operating condition.As under-voltage overlong time, then tripping coil YA normally trips.

The utility model adds a suitable little time-delay to former under-voltage release guard; when accident of being short-circuited and unknown cause line voltage unexpected fluctuation, faulty line is normally protected tripping operation, and non-fault line is deferred action then; escape the transient fluctuation of voltage, guarantee that mine power supply system normally moves.

Claims

1. under-voltage release guard device; comprise the rectification circuit that is connected with external circuit; be serially connected with tripping coil (YA) between the output of rectification circuit; it is characterized in that: at the two ends of tripping coil delay capacitor (C) in parallel; also be connected with the time relay (SJ) on the external circuit, the contact (SJI) of the time relay (SJ) is connected with tripping coil (YA).