CN2247888Y

CN2247888Y - Multifunctional combined lightning protection and overvoltage protector

Info

Publication number: CN2247888Y
Application number: CN 96213584
Authority: CN
Inventors: 周翼; 马奇峰
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-06-14
Filing date: 1996-06-14
Publication date: 1997-02-19
Anticipated expiration: 2006-06-14

Abstract

The utility model relates to a lightning protection and overvoltage protection device for power supply systems and electronic equipment, which is mainly used for protecting electrical equipment of which the voltage range is between 24V and 380V. The utility model has the technical proposal that the input ends A and B which are connected with two phases of a power wire in a bridge connection mode are connected with varistors R1 and R2 respectively, others ends of the R1 and the R2 are connected with both ends a and b of a metal ceramic three stage discharge lamp K, and current limiting tubes u 1 and u 2 with alarms are connected in parallel between the earthing end c and the ends a and b of the K. The utility model has the advantages of fast reaction, strong current conveyance capacity, high reliability, etc.

Description

Multifunction combined lightning protection and overvoltage protection device

The utility model relates to a kind of lightning protection and overvoltage protection that is used for power-supply system and electronic equipment.Mainly be applicable to power supply and the electric equipment of 24～380V.

Existing like product is used for lightning protection and overvoltage protection mainly contains piezo-resistance, three grades of discharge tubes of pottery magnetic etc., and is independent use.It is fast that piezo-resistance has reaction speed, the characteristics that conveyance capacity is little; And that three grades of discharge tubes of pottery magnetic have reaction speed is slow, the characteristics that conveyance capacity is strong.When these two kinds of components and parts use separately, always come with some shortcomings, can not reach the requirement that reaction speed is fast, conveyance capacity is strong.

The purpose of this utility model is that above-mentioned prior art is carried out reasonable combination, and both reaction speed was fast when making it to be used for lightning protection and overvoltage protection, has the strong characteristics of conveyance capacity again.

The main technical schemes that realizes above-mentioned purpose is: this multifunction combined lightning protection and overvoltage protection device cross-over connection meet Zinc-oxide piezoresistor R1, R2 respectively in input A, the B of power line two-phase, the other end of R1, R2 meets two ends a, the b of three grades of discharge tube K of metal pottery magnetic respectively, the earth terminal c ground connection of K is parallel with current limiting tube u1, the u2 that band is reported to the police respectively between three grades of discharge tube a, b ends of metal pottery magnetic and c end; Cross-over connection meets a Zinc-oxide piezoresistor R in the input of every two-phase (line) of three-phase four-wire system power circuit, two ends a, the b of three grades of discharge tube K of another termination metal pottery magnetic of R, the earth terminal ground connection of K is parallel with the current limiting tube u that band is reported to the police respectively between a, b end and c end.

This device has the reliability height, and conveyance capacity is strong, and reaction speed is fast, uses and advantage such as installation, easy maintenance.

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

Fig. 1 is circuit theory diagrams of the present utility model;

Fig. 2 is the circuit theory diagrams that are used for the three-phase four-wire system power line;

Fig. 3 is use of the present utility model and scheme of installation;

Fig. 4 is use of the present utility model and scheme of installation.

As shown in Figure 1, 2, its circuit connecting relation is write clearly in technical scheme, what need emphasize is that three kinds of devices that the utility model adopts all have better performance, and Zinc-oxide piezoresistor R1, R2 have the fast characteristics of reaction speed, and its reaction time can reach m μ s level; It is big that three grades of discharge tube K of metal pottery magnetic have a conveyance capacity, characteristics such as reliability height; The reactionless speed of current limiting tube u1, u2 that band is reported to the police shows protective effect after having overcurrent.R1, R2 are identical among Fig. 1, and u1 also is identical with u2.

As shown in Figure 3, Figure 4, the utility model can be various power consumption equipments, electronic equipment provides reliable protection, and when concrete the use, input A, the B of this equipment are connected across on the two-phase of power line or grid line.Or input A, B, C, the O of this equipment are connected across on four power lines of three-phase four-wire system power supply.

Concrete operation principle of the present utility model is:

When A point or B point because when having damage to crops caused by thunder and high energy surge to occur; at first piezo-resistance is in the conducting during greater than the starting value of piezo-resistance of damage to crops caused by thunder voltage and surge voltage; in overcurrent during less than certain energy; through the overcurrent protector ground of directly releasing; in overcurrent during greater than certain value; through overcurrent protector fusing when electric current reaches certain energy after the piezo-resistance; three grades of discharge tube conductings simultaneously; lightning surge and high energy surge are again through three grades of discharge tubes ground of releasing; thereby reach protecting the protection of equipment in m μ s level; this product is by the combination to three kinds of protective devices; drawn separately protection advantage to lightning protection and high energy surge; make the inaccessible effect of single device, on this product, obtain unified performance.

When being used for the three-phase four-wire system power circuit, as Fig. 2, its operation principle is with circuit shown in Figure 1.

The difference of this product be to have adopted one can be at little energy both at three grades of discharge tube prestarts directly by limiting protector certain energy of releasing; make the reaction timeliness of the reaction time of this product for the fastest Zinc-oxide piezoresistor; it is big simultaneously to have increased by three grades of discharge tube conveyance capacities again; high reliability features; while, the recovery that does not influence discharge tube after its fusing is reported to the police also can directly show the lightning protection of the certain energy of process because flow restricter is the single direction element.

Claims

1, a kind of multifunction combined lightning protection and overvoltage protection device is characterized in that:

A, cross-over connection meet Zinc-oxide piezoresistor R1, R2 respectively in input A, the B of power line or grid line two-phase, two ends a, the b of three grades of discharge tube K of another termination metal pottery magnetic of R1, R2, the earth terminal c ground connection of K is parallel with current limiting tube u1, the u2 that band is reported to the police respectively between three grades of discharge tube a, b ends of metal pottery magnetic and c end;

B, cross-over connection meet a Zinc-oxide piezoresistor R in the input of every two-phase (line) of three-phase four-wire system power circuit, two ends a, the b of three grades of discharge tube K of another termination metal pottery magnetic of R, the earth terminal c ground connection of K is parallel with the current limiting tube u that band is reported to the police respectively between a, b end and c end.