CN2255691Y

CN2255691Y - Lightning-proof protector for single-phase power supply

Info

Publication number: CN2255691Y
Application number: CN 96236514
Authority: CN
Inventors: 伍永康; 吴晓
Original assignee: Individual
Current assignee: Wu Yonggang
Priority date: 1996-01-09
Filing date: 1996-01-09
Publication date: 1997-06-04
Anticipated expiration: 2006-01-09

Abstract

The utility model relates to a lightning-proof protector for a single-phase power supply, which is composed of a primary overvoltage protection circuit, a smoothing circuit, a secondary overvoltage protection circuit, a casing, etc. The utility model adopts a mode that a discharge tube is connected in series with a varistor, so that a large electric network fluctuation allowance can be obtained, and a low protective voltage value can be obtained simultaneously. An impulse spike can be flattened by the smoothing circuit, and the protective effect is extremely ideal. The utility model is suitable for the lightning protection of switchboards with large volume, and can also be installed in a power socket. The installation is simple, and the power network is not affected when the utility model is in a failure mode.

Description

The single phase poaer supply lightning protection device

The utility model relates to a kind of protective device, particularly a kind of single phase poaer supply lightning protection device.

A kind of " how preventing supply sockets with three " disclosed in the Chinese patent (patent No. 9321700.X), though have certain lightning protection effect, but still have the following disadvantages: 1, owing in circuit, adopted piezo-resistance, its amplitude limit ability to make discharging gap in parallel with it there is no actual effect; 2, piezo-resistance directly is parallel between phase line and the zero line, not only certain power consumption (long-term continuous current flows through piezo-resistance can make its degradation) is arranged owing to there is leakage current in piezo-resistance, and when the thunderbolt energy excessive and when causing piezo-resistance to be damaged, because of the pressure responsive resistor failure pattern is a puncture short, therefore may cause the 220V ac power supply system to break down; 3, because there is certain fluctuation in AC power, be to keep bigger allowance, can only select nominal value higher piezo-resistance, and the piezo-resistance value is higher, the inevitable variation of lightning protection properties.

The purpose of this utility model is to avoid above-mentioned the deficiencies in the prior art part and provides a kind of lightning protection effect good, single phase poaer supply lightning protection device safe in utilization.

The purpose of this utility model can reach by following measure: the utility model comprises elementary overvoltage crowbar, housing; it is characterized in that: also have flat wave circuit, secondary overvoltage crowbar; the output and the flat wave circuit of elementary overvoltage crowbar join, and the output of flat wave circuit and secondary overvoltage crowbar join.

The purpose of this utility model can also reach by following measure: be connected to mutual discharge tube F1 that is connected in series and piezo-resistance Y1 between the phase line L of AC power and zero line W, capacitor C is connected with resistance R 1 with resistance R 2 and after connecing again, be connected between phase line L and the zero line W, between phase line L and ground wire E, be connected to mutual discharge tube F2 that connects and piezo-resistance Y2, between zero line W and ground wire E, be connected to discharge tube F3.

Fig. 1 is the utility model functional-block diagram;

Fig. 2 is a contour structures schematic diagram of the present utility model;

Fig. 3 adopts the electrical schematic diagram of parallel connection for the utility model;

Fig. 4 adopts the electrical schematic diagram of tandem connection for the utility model.

With reference to Fig. 1, Fig. 2, the utility model is made up of elementary overvoltage crowbar 1, flat wave circuit 2, secondary overvoltage crowbar 3, housing 4 etc.In the housing 4 electronic circuit board is housed; And plug, socket etc. are housed on the surface.

With reference to Fig. 3, F1, F2, F3 are discharge tube, and Y1, Y2 are piezo-resistance, and C is a flat wave capacitor, and R1 is the current limliting electricity, and R2 is a discharge resistance.In circuit, the mode that overvoltage protection adopts discharge tube to connect with piezo-resistance.The discharge tube value is higher, can prevent the misoperation that produces owing to power-supply fluctuation effectively; The piezo-resistance value is lower, can obtain desirable lightning protection effect.Can also prevent simultaneously the leakage current of piezo-resistance effectively.

Flat wave circuit adopts the bigger electric capacity (a few microfarad to tens microfarad) of value to add current-limiting resistance R1, discharge resistance R2 composition.It can be pruned because the spike that discharge tube produces makes the impact output waveform comparatively level and smooth, and lightning protection effect is better.

Between zero-power line (W) and protection ground wire (E) and connect the lower discharge tube of a nominal value, the thunder and lightning energy is released to the earth by discharge tube.

With reference to Fig. 4, F1～F3, F are discharge tube, and Y1～Y3 is a piezo-resistance, and L1 is a filter capacitor.Flat wave circuit is made of inductance L 1 and capacitor C 1, and L1 and C1 value are relatively large, forms the low-frequency filter structure.Because therefore the main concentration of energy of thunder and lightning waveform is in the flat wave circuit between elementary protection and the second class protection circuit at hundreds of～thousands of hertz, can play very good lightning protection effect.

The utility model has following advantage compared to existing technology:

1, the mode that adopts discharge tube to connect with piezo-resistance both can obtain bigger electrical network ripple Moving surplus can obtain again lower protection magnitude of voltage simultaneously.

2, adopt flat wave circuit, can scabble the impact spike, make the protection effect extremely desirable.

3, failure mode can not have any impact to electrical network.

4, both be suitable for the bigger switchboard lightning protection of capacity, and also can be installed in the supply socket, applied range is installed and used simple.

Claims

1, a kind of single phase poaer supply lightning protection device; comprise elementary overvoltage crowbar 1, housing 4; it is characterized in that: also have flat wave circuit 2, secondary overvoltage crowbar 3; the output of elementary overvoltage crowbar 1 and flat wave circuit 2 join, and the output of flat wave circuit 2 and secondary overvoltage crowbar 3 join.

2, protective device according to claim 1; it is characterized in that: between the phase line L of AC power and zero line W, be connected to mutual discharge tube F1 that is connected in series and piezo-resistance Y1; capacitor C is connected with resistance R 1 with resistance R 2 and after connecing again; be connected between phase line L and the zero line W; between phase line L and ground wire E, be connected to mutual discharge tube F2 that connects and piezo-resistance Y2, between zero line W and ground wire E, be connected to discharge tube F3.