CN201294367Y

CN201294367Y - Electronic trip device of lightning protection device

Info

Publication number: CN201294367Y
Application number: CNU2008200959117U
Authority: CN
Inventors: 冉煜华; 刘细华; 曾文阳
Original assignee: COMTECH TECHNOLOGY (SHENZHEN) Co Ltd
Current assignee: COMTECH TECHNOLOGY (SHENZHEN) Co Ltd
Priority date: 2008-07-22
Filing date: 2008-07-22
Publication date: 2009-08-19
Anticipated expiration: 2018-07-22

Abstract

The utility model relates to an electronic tripping device of a lightning arrester, which comprises a tripping circuit breaker and also comprises a power supply, a surge current sampling module, a thunder current induction coil, a delay circuit module, a voltage conversion module, a voltage comparison circuit module, and an electromagnetic trigger circuit, wherein when lightning stroke earth short circuit current is generated, the surge current sampling module carries out sampling and analyzing, the current is delayed by the delay circuit module and is judged to be after-flow, then, a contact k2 of a relay J2 in the delay circuit module is closed, then, when the current is judged for the second time through the voltage comparison circuit module to be failure current, a contact k3 of a relay J3 of the voltage comparison circuit module is closed, an electromagnetic coil J1 of the electromagnetic trigger circuit is acted to drive the tripping circuit breaker, and all contacts of the lightning arrester are disconnected. The electronic tripping device enables the power supply circuit and the failure current to be separated safely, the safety of the power supply circuit is guaranteed, and accidents such as combustion, even explosion and the like can be effectively prevented.

Description

The electronics trip gear of lightning protection device

Technical field

The utility model relates to lightning protection device, particularly relates to the electronics trip gear of lightning protection device.

Background technology

No matter the prior art lightning protection device is votage limit type lightning protection device or switching mode lightning protection device, and being and adopting hot dropout technology, its principle is to utilize heat that piezo-resistance produces when deterioration to realize thermal-arrest thread off (making the disconnection of fault current and circuit).There is following deficiency in this mode: when electrical breakdown appearred in piezo-resistance, owing to be the some puncture of moment, the heat of generation did not also make trip point throw off, and short circuit has just appearred in lightning protection device, thereby produces burning even explosion accident.

The utility model content

The technical problems to be solved in the utility model is to avoid above-mentioned the deficiencies in the prior art part and the electronics trip gear that proposes a kind of lightning protection device, when the thunderbolt short circuit current to earth occurring, this electronics trip gear can be realized reliably threading off and open circuit, make power supply circuits and fault current safe escape, ensure the safety of power supply circuits, prevented accidents such as burning even blast effectively.

The utility model solve the technical problem can be by realizing by the following technical solutions:

The electronics trip gear of design, a kind of lightning protection device of use, comprise the dropout circuit breaker, also comprise power supply, surge current sampling module, lightning current induction coil, and delay circuit module, voltage transformation module, voltage comparator circuit module and electromagnetism circuits for triggering; Described dropout circuit breaker is connected with the armature of the solenoid J1 of described electromagnetism circuits for triggering; When the thunderbolt short circuit current to earth occurring, through described lightning current induction coil induction, described surge current sampling module carries out sampling analysis, through described delay circuit module time-delay, after being judged as afterflow, the contact k2 closure of the relay J 2 in the delay circuit module, judge once more through voltage transformation module and voltage comparator circuit module then, when being judged as fault current, the contact k3 closure of the relay J 3 of described voltage comparator circuit module, the conducting of described electromagnetism circuits for triggering, the solenoid J1 action of electromagnetism circuits for triggering, drive the dropout circuit breaker by armature, each contact of lightning protection device is all disconnected.

Compare with prior art, the technique effect of the electronics trip gear of the utility model lightning protection device is: when the thunderbolt short circuit current to earth occurring, this electronics trip gear can be realized reliably threading off and open circuit, make power supply circuits and fault current safe escape, ensure the safety of power supply circuits, prevented accidents such as burning even blast effectively.

Description of drawings

Fig. 1 is that the master of the electronics trip gear of the utility model lightning protection device looks cross-sectional schematic;

Fig. 2 is that cross-sectional schematic is looked on the left side of described electronics trip gear;

Fig. 3 is the theory diagram of described electronics trip gear;

Fig. 4 is the circuit diagram of described electronics trip gear.

Embodiment

Be described in further detail below in conjunction with the most preferred embodiment shown in the accompanying drawing.

A kind of electronics trip gear of lightning protection device, as shown in Figures 1 to 4, comprise dropout circuit breaker 90, also comprise power supply 10, surge current sampling module 20, lightning current induction coil 30, and delay circuit module 40, voltage transformation module 50, voltage comparator circuit module 60 and electromagnetism circuits for triggering 70; Described dropout circuit breaker 90 is connected (perhaps directly with the armature of described solenoid J1 directly as the dropout circuit breaker) with the armature of the solenoid J1 of described electromagnetism circuits for triggering 70.With three-phase and four-line power supply circuits shown in Figure 4 is example, in conjunction with shown in Figure 1, each moving contact 100 of each circuit of circuit is arranged on same movably on the stock 101, be with spring 102 on this stock 101, during initial condition, described dropout short-circuiting device 90 (is exactly a block from structure) blocks the end of described stock 101, and described each moving contact 100 is in closure state, and described spring 102 is compressed; When the thunderbolt short circuit current to earth appears in system, through described lightning current induction coil 30 inductions, described surge current sampling module 20 carries out sampling analysis, through described delay circuit module 40 time-delays, after being judged as afterflow, the contact k2 closure of the relay J 2 of delay circuit module 20, judge once more through voltage transformation module 50 and voltage comparator circuit module 60 then, when being judged as fault current, the contact k3 closure of the relay J 3 of described voltage comparator circuit module 60, described electromagnetism circuits for triggering 70 conductings, the solenoid J1 action of electromagnetism circuits for triggering 70 drives dropout circuit breaker 70 by armature and moves, the barrier force of described stock 101 ends disappears, under the elastic force effect of spring 102, described each moving contact 100 all disconnects, power supply circuits and fault current safe escape.

As shown in Figure 2, the electronics trip gear of the utility model lightning protection device also comprises manual reset controlling organization 80, is used for resetting in thunder-strike current manual operation later, and these all are prior aries, repeat no more herein.

Claims

1. the electronics trip gear of a lightning protection device, comprise the dropout circuit breaker, it is characterized in that: also comprise power supply, surge current sampling module, lightning current induction coil, and delay circuit module, voltage transformation module, voltage comparator circuit module and electromagnetism circuits for triggering; Described dropout circuit breaker is connected with the armature of the solenoid J1 of described electromagnetism circuits for triggering.