CN100352122C

CN100352122C - Surge protector with piece separation

Info

Publication number: CN100352122C
Application number: CNB2005100831294A
Authority: CN
Inventors: 刘焕利
Original assignee: SHENLONG ELECTRICAL APPLIANCES CO Ltd ZHEJIANG
Current assignee: SELONG ELECTRIC CO., LTD.
Priority date: 2005-07-13
Filing date: 2005-07-13
Publication date: 2007-11-28
Anticipated expiration: 2025-07-13
Also published as: CN1713476A

Abstract

The present invention discloses a surge protector with piece separation which comprises at least one module; an alarm micro switch and a plurality of voltage dependent resistors are arranged in each module. The present invention is characterized in that each module is connected with a thermal failure separator via low temperature welding spots; a short circuit sheet connected with an indicating member on the thermal failure separator is electrically connected with the voltage dependent resistors and a plug. The surge protector causes the surge protector to still keep working when one or part of voltage dependent resistors are in failure and can carry out indication; when all the voltage dependent resistors are in failure, the surge protector carries out concentrated alarm.

Description

The surge protector that burst breaks away from

Technical field

The present invention relates to surge protector, is a kind of when the surge protector of this module endure during a pressure responsive resistor failure in the module specifically.

Background technology

Popularize and the increase of microelectronic device quantity surge protector (SPD) extensive use in low-voltage distribution system along with computer.Modularization voltage limit type SPD has function admirable, makes up plurality of advantages such as flexible, easy for installation, thereby becomes the main product of SPD.

Since voltage limit type SPD be with piezo-resistance (MOV) as its main devices, in use there is the possibility of deterioration failure in piezo-resistance, so the thermal failure disconnector almost is the parts that this series products must have.The major function of thermal failure disconnector is: in the time will causing temperature to raise behind the piezo-resistance deterioration failure because leakage current increases, before temperature reaches allowable temperature, SPD is broken away from from electrical network; Show this fault by visual device simultaneously; Sometimes also need to send the signal of telecommunication to report to the police by the output contact.

Because low-voltage distribution system has proposed new requirement to the shock-resistant ability of SPD, maximum discharge current from 40kA be increased to 60,80,100,150kA etc.Yet be subjected to the constraint of modularization, can not realize, so in a module, adopt the structure of multi-disc piezo-resistance parallel connection just to occur by strengthening piezo-resistance overall dimension.The surge protector structure of present this piezo-resistance parallel connection; all piezo-resistances in parallel are used same thermal failure disconnector in the same module; as shown in Figure 1; piezo-resistance 10 in parallel is connected with two

plugs

20,30; the short-circuit piece 50 of thermal failure disconnector is welded on the pressure drag resistance 10 by a low temperature tin welding spot 60, and electrically connects by metallic conduction litzendraht wire 40 and plug 30.Electric current is entered by plug 20, to plug 30, forms the loop by piezo-resistance 10, short-circuit piece 50 and braid over braid 40.After as long as piezo-resistance 10 deterioration failures are arranged in the module of a surge protector; temperature rises and makes low temperature solder joint 60 melt; spring (omitting among the figure) effect down thermal failure disconnector drive short-circuit piece 50 by Fig. 1 in the direction of arrow move; make braid over braid 40 and piezo-resistance 10 disconnect; whole module is broken away from from electrical network, and send indication and send signal of telecommunication warning by sensitive switch.

There is following shortcoming in this modular SPD: (1) is owing to the parallel connection of the piezo-resistance in each module and use a thermal failure disconnector, in the course of the work because of behind the piezo-resistance deterioration failure, the capital makes the thermal failure disconnector break and send warning from electrical network, must change, this can make other unspoiled piezo-resistance therefore go out of use, and has caused the maintenance cost increase.Yet practice shows that the thunderbolt probability that electrical network can reach maximum discharge current is very low, as long as also have piezo-resistance in the module, just can protect the lightning impulse more than 80%.(2) for short-circuit piece can be moved so that piezo-resistance is disconnected from electrical network, adopted first draft ribbon 40 that short-circuit piece 50 is connected with plug 30, the existence of first draft ribbon 40 can increase the residual voltage of SPD.

Summary of the invention

The high problem of above-mentioned maintenance cost at the in parallel shared thermal failure disconnector existence of piezo-resistance in the present modular surge protector; the object of the present invention is to provide a kind of novel surge protector, in this surge protector during pressure responsive resistor failure other piezo-resistance still can keep work.

In order to achieve the above object, the present invention adopts following technical solution: the surge protector that a kind of burst breaks away from, comprise at least one module, a warning sensitive switch and a plurality of piezo-resistance that is connected in parallel are wherein arranged in each module, it is characterized in that: each piezo-resistance in each module all is connected with a thermal failure disconnector by the low temperature solder joint, the indication piece of different thermal failure disconnectors withstands on the same slide block in the same module, this slide block acts on the described warning sensitive switch, the short-circuit piece that is connected with indication piece on the thermal failure disconnector connects piezo-resistance and plug conducting, when wherein certain piezo-resistance deterioration causes connected thermal failure disconnector when electrical network breaks away from, other piezo-resistances still can work on; All piezo-resistances in same module all lost efficacy and caused all thermal failure disconnector actions, made all piezo-resistances after the electrical network disconnection, and the warning sensitive switch just moves and send the warning signal of telecommunication.

Described surge protector also comprises the output contact, and module is a plurality of, arbitrary sensitive switch action, thus all will make the action of output contact send the warning signal of telecommunication.

Be connected with described short-circuit piece on the described thermal failure disconnector, described short-circuit piece is welded to connect with described piezo-resistance and described plug respectively by two low temperature solder joints.This structure does not need the conductive braided fabric line, has shortened the length of galvanic circle, effectively reduces the residual voltage of surge protector.

This surge protector advantage in parallel with respect to existing piezo-resistance and shared same thermal failure disconnector is:

(1) since each piezo-resistance all to a thermal failure disconnector should be arranged, behind a piezo-resistance deterioration failure, its corresponding thermal failure disconnector breaks away from it and the indication of losing efficacy from electrical network, and other piezo-resistance still can keep operate as normal; Prolong the life cycle of surge protector, reduced maintenance cost.

(2) thermal failure disconnector in the same module and sensitive switch constitute and logical relation, make to have only just to send signal of telecommunication warning when piezo-resistance all lost efficacy in the same module, reach the effect of burst indication concentrated alarm.

(3) withstand on the slide block by the indication piece that makes the thermal failure disconnector, act on this and logic realization mode on the sensitive switch, have advantage simple in structure, reliable, that cost is low by slide block.

(4) adopt short-circuit piece that piezo-resistance is connected with the plug short circuit, do not need braid over braid, shortened the length of galvanic circle, can effectively reduce the residual voltage of surge protector.

Description of drawings

Fig. 1 is the connection status schematic diagram of existing surge protector piezo-resistance and disconnector.

Fig. 2 is the connection status schematic diagram of surge protector piezo-resistance of the present invention and disconnector.

Fig. 3 is a surge protector outside drawing with four modules of the present invention.

Fig. 4 is a logic diagram that the module of four piezo-resistances is arranged.

Fig. 5 is the alarm principle figure of a module.

Fig. 6 is the state diagram of surge protector of the present invention when operate as normal.

Fig. 7 is that the thermal failure disconnector of surge protector breaks away from back indication schematic diagram.

Fig. 8 is the sensitive switch in the surge protector and the winding diagram of output contact.

Fig. 9 is the sensitive switch of the surge protector among Fig. 8 and the schematic diagram of output contact.

Figure 10 is the logic diagram of the surge protector among Fig. 3.

Embodiment

Below in conjunction with accompanying drawing with a surge protector that is made of 4 modules is that example is described further the surge protector that burst of the present invention breaks away from.

As shown in Figure 3 be that a burst that comprises 4 modules 100 breaks away from surge protector, each module 100 comprises 4 piezo-resistances again, each piezo-resistance is to there being a thermal failure disconnector 200, its output contact 500 is used for the output alarm signal of telecommunication.In the distribution system of 3 phases, 5 line systems, 3 live wire L and 1 zero line N have formed 1 surge protector by 4 modules like this to being connected to a module 100 between the earth connection PE.

The circuit theory diagrams of each module as shown in Figure 4 in the surge protector; the piezo-resistance 10 of 4 parallel connections is connected with thermal failure disconnector 200 respectively; and be connected in parallel on input terminal L and the lead-out terminal PE by plug; there is indication piece to be used to carry out heat on each thermal failure disconnector and breaks away from indication, have between thermal failure disconnector 200 and the heat disengaging indication " or " logical relation (code name＞1).Thermal failure disconnector 200 with and the sensitive switch that is connected of output contact between have " with " logical relation (Dai Hao ﹠amp; ).

The indication and the warning of surge protector realize mechanically; as shown in Figure 5; indication piece one end 220 of 4 thermal failure disconnectors is pressed on the slide block 300; slide block 300 acts on the sensitive switch 400; in conjunction with Fig. 6; Fig. 7 and shown in Figure 2; conceal under normal condition in device is protected in surge indication piece upper end 210 in the thermal failure disconnector; when piezo-resistance 10 deterioration failures make two low temperature solder joints 60; during 60 ' fusing; indication piece moves to the direction away from the low temperature solder joint under the effect of spring (not shown); driving short-circuit piece 50 simultaneously moves and plug 30 disengagings; with piezo-resistance 10 and plug 20; 30 current circuits that constitute disconnect; and make indication piece upper end 210 from surge protector, stretch out, reach thermal failure and break away from purpose of indicating.And the piezo-resistance that lost efficacy to break away from still is connected on and works in the electrical network; as long as and a piezo-resistance job arranged; the indication piece of its thermal failure disconnector just keeps withstanding on the slide block 300 among Fig. 5; slide block 300 acts on the normal condition that sensitive switch 400 protections are not reported to the police; behind all pressure responsive resistor failures; the indication piece lower end 220 of all thermal failure disconnectors all no longer acts on slide block 300 and sensitive switch 400; sensitive switch 400 actions are sent the warning signal of telecommunication by output contact 500; report to the police; realization thermal failure disconnector and sensitive switch and output contact " with " logical relation; and between thermal failure disconnector and the heat disengaging indication piece " or " logical relation, this mechanical device has simple in structure; the advantage of reliable operation.

The logic diagram of 4 modules as shown in figure 10 in the same surge protector; the line of its sensitive switch and output contact and schematic diagram are respectively as Fig. 8 and shown in Figure 9; between sensitive switch in 4 modules and the output contact be or logical relation; the action of whichever sensitive switch, normally closed interlock will disconnect, the closed signal of telecommunication that sends of normally open contact is reported to the police thereby all will make.Make whole surge protector can reach the effect of burst disengaging, indication and concentrated alarm.

Claims

1, the surge protector that a kind of burst breaks away from, comprise at least one module, a warning sensitive switch and a plurality of piezo-resistance that is connected in parallel are wherein arranged in each module, it is characterized in that: each piezo-resistance in each module all is connected with a thermal failure disconnector by the low temperature solder joint, the indication piece of different thermal failure disconnectors withstands on the same slide block in the same module, this slide block acts on the described warning sensitive switch, the short-circuit piece that is connected with indication piece on the thermal failure disconnector connects piezo-resistance and plug conducting, when wherein certain piezo-resistance deterioration causes connected thermal failure disconnector when electrical network breaks away from, other piezo-resistances still can work on; All piezo-resistances in same module all lost efficacy and caused all thermal failure disconnector actions, made all piezo-resistances after the electrical network disconnection, and the warning sensitive switch just moves and send the warning signal of telecommunication.

2, the surge protector that breaks away from of burst as claimed in claim 1, it is characterized in that: described surge protector also comprises the output contact, and module is a plurality of, arbitrary sensitive switch action, thus all will make the action of output contact send the warning signal of telecommunication.

3, the surge protector of burst disengaging as claimed in claim 1 or 2, it is characterized in that: be connected with described short-circuit piece on the described thermal failure disconnector, described short-circuit piece is welded to connect with described piezo-resistance and described plug respectively by two low temperature solder joints.