CN104638629B

CN104638629B - Divide the symmetrical overvoltage lightning protection circuit of triggering

Info

Publication number: CN104638629B
Application number: CN201510076625.0A
Authority: CN
Inventors: 蔡卫; 施荣华; 凌树海; 赵忠良
Original assignee: Nanjing Phoenix Contact Co Ltd; Phoenix Contact Asia Pacific Nanjing Co Ltd
Current assignee: Nanjing Phoenix Contact Co Ltd; Phoenix Contact Asia Pacific Nanjing Co Ltd
Priority date: 2015-02-13
Filing date: 2015-02-13
Publication date: 2019-03-05
Anticipated expiration: 2035-02-13
Also published as: CN104638629A

Abstract

The invention discloses a kind of symmetrical overvoltage lightning protection circuits of partial pressure triggering; it includes protection fuse, varistor, gas-discharge tube, capacitor, resistance; a partial pressure trigger circuit is connected to after the varistor is in parallel with the capacitor that bypass acts on; the trigger circuit is made of resistance, capacitor, gas-discharge tube; it is formed by a resistance and a capacitor and is joined circuit together; it is in parallel with the endpoint of gas-discharge tube 1, endpoint 2 again, a resistance is also parallel between the endpoint 2, endpoint 3 of the gas-discharge tube；The varistor front end is also connected with protection fuse; the positive L and cathode N of the protection fuse access power supply; the technical program utilizes the frequency stability characteristics of resistive voltage division circuit and the characteristic of capacitor low capacitive reactance in high frequency; tube device is put in conjunction with varistor, three end triggered airs, lightning protection device is made to be resistant to high-pressure system power frequency false voltage without impaired while to obtain lower electric protection horizontal.

Description

Divide the symmetrical overvoltage lightning protection circuit of triggering

Technical field

The present invention is a kind of lightning protection circuit, in particular to a kind of partial pressure trigger-type lightning protection circuit for protecting power supply belongs to In lightning protection device field.

Background technique

Due to the raising of electrical equipment lightning protection demand, lightning protection device is by more and more extensive use, the inherently safe of lightning protection device, Safety especially under system power-frequency overvoltage has become especially prominent, in the communications industry and engineering in use, in order to adapt to Live error connection proof, reversal connection demand, a large amount of symmetrical expression lightning protection devices are used, and such lightning protection device currently on the market exists Two kinds of protected modes of L-PE and N-PE and be identical, therefore haved the function that error connection proof, reversal connection, but also therefore varistor It has been directly connected between L-PE and N-PE, in power communications system, the big electricity of high pressure that when system high pressure failure can generate Stream, duration are up to the power-frequency voltage and electric current of 200ms to 5s, and varistor is unbearable, can start under power-frequency voltage, It is light then so that lightning protection device is detached from circuit and lose protecting effect, it is heavy then the problems such as short-circuit, on fire can be generated.Currently on the market such anti- Thunder device is mostly without reliable solution, or simply connect varistor, gap or gas-discharge tube, this method make lightning protection Device is failure to actuate in varistor failure, but makes voltage protection level too high, has reached 4-5kV, increases equipment because of over-voltage And the risk damaged.

Therefore, in order to preferably solve the above problems, in view of the above-mentioned problems, guaranteeing that lightning protection device is resistant to high pressure system While transient overvoltage caused by failure of uniting is tested, obtain lower voltage protection level, be it is necessary, in this way can be User equipment is more effectively protected under the premise of lightning protector safety, adopts the following technical solutions the final purpose for being designed as this paper.

Summary of the invention

The technical program aims to overcome that the deficiencies in the prior art, in order to meet the function Indication Characteristics of lightning protection device It needs, is mainly used for the place of symmetrical surge protector (i.e. the lightning protection device that L and N use same circuits), utilizes resistive voltage division The characteristic of the frequency stability characteristics and capacitor of circuit low capacitive reactance in high frequency, puts pipe in conjunction with varistor, three end triggered airs Device makes lightning protection device be resistant to high-pressure system power frequency false voltage without impaired while obtaining lower electric protection water It is flat, protect it from damage caused by thunder and lightning induction voltage, power supply disturbance, static discharge etc..

The purpose of the technical program, will be realized through the following technical scheme:

A kind of symmetrical overvoltage lightning protection circuit of partial pressure triggering comprising protection fuse F1 and F2, varistor MOV1 With MOV2, shunt capacitance C1 and C2, gas-discharge tube GDT, it is characterised in that: it further include a partial pressure trigger circuit, it is described Partial pressure trigger circuit is made of resistance R1, capacitor C3, resistance R2, and the resistance R1 and the capacitor C3 form a parallel circuit, It is in parallel with the endpoint 1 of the gas-discharge tube GDT, endpoint 2 again, the endpoint 2 of the gas-discharge tube GDT, endpoint 3 it Between be also parallel with a resistance R2；It is connected to after the varistor MOV1 and MOV2 is in parallel with shunt capacitance C1 and C2 described Partial pressure trigger circuit, the front end varistor MOV1 and MOV2 is also connected with protection fuse F1 and F2, and the protection is molten The positive L and cathode N of silk F1 and F2 access power supply.

Further, the shunt capacitance C1 and C2 is in parallel with varistor MOV1 and MOV2, relative to shunt capacitance The high resistance state of the capacitive reactance of C1 and C2, the varistor MOV1 and MOV2 is considered open circuit, plays capacitive reactance, and in gas Body discharge tube GDT plays the role of bypass and reduces lightning protection device residual voltage when acting；The partial pressure trigger circuit, carry out power frequency partial pressure and Surge triggering；The fuse F1 and F2 is indicator type fuse, current mode fuse, temperature mode fuse, and fuse F1 and F2 have Functional indicia, fusing or when non-blown state, shows label difference；The gas-discharge tube GDT is band three end of Trigger Function Gas-discharge tube, dc breakdown voltage U13=U12+U23.

The application of the technical program structure protrudes effect and shows themselves in that

1, the symmetrical lightning protection circuit of the technical program use partial pressure, triggering technique can be widely applied to need use pair The occasion of title formula lightning protection device, the circuit eliminate high-pressure system temporary overvoltages to threaten to lightning protection device bring, eliminates user Therefore failure need face replacement lightning protection device, product short circuit, it is on fire the problems such as；Relative in the market using conventional gap, list Pole gas puts the mode that pipe mode is resistant to high pressure overvoltage failure, and the voltage protection value of these circuits uses often in 4kV or more The typical circuit of the technical program, by IEC61643-11 standard, the voltage protection value after operating duty cycle test is less than 2.2kV, This makes product under the premise of meeting tolerance high pressure overvoltage, more possible greatly to protect user equipment.

Attached drawing with reference to embodiments makees further decomposition to a specific embodiment of the invention, so that this technology side Case is more readily understood, grasps.

Detailed description of the invention

Fig. 1 is the circuit diagram of technical solution of the present invention embodiment.

The meaning of appended drawing reference in figure are as follows:

101- divides trigger circuit.

Specific embodiment

As shown in Figure 1, a kind of symmetrical overvoltage lightning protection circuit of partial pressure triggering comprising protection fuse F1 and F2, pressure Quick resistance MOV1 and MOV2, shunt capacitance C1 and C2, gas-discharge tube GDT further include a partial pressure trigger circuit 101, described Trigger circuit 101 be made of resistance R1, capacitor C3, resistance R2, the resistance R1 and the capacitor C3 form a parallel circuit, It is in parallel with the endpoint 1 of the gas-discharge tube GDT, endpoint 2 again, the endpoint 2 of the gas-discharge tube GDT, endpoint 3 it Between be also parallel with a resistance R2；It is connected to after the varistor MOV1 and MOV2 is in parallel with shunt capacitance C1 and C2 described Partial pressure trigger circuit 101, the front end varistor MOV1 and MOV2 be also connected with protection fuse F1 and F2, the protection The positive L and cathode N of fuse F1 and F2 access power supply.

Further, the shunt capacitance C1 and C2 is in parallel with varistor MOV1 and MOV2, relative to shunt capacitance The high resistance state of the capacitive reactance of C1 and C2, the varistor MOV1 and MOV2 can be considered open circuit, play capacitive reactance, and Gas-discharge tube GDT plays the role of bypass and reduces lightning protection device residual voltage when acting；The partial pressure trigger circuit carries out power frequency partial pressure It is triggered with surge；The fuse F1 and F2 is indicator type fuse, current mode fuse, temperature mode fuse, and fuse F1 and F2 have Functional property label, when fusing or non-blown state, shows label difference；The gas-discharge tube GDT is band Trigger Function three Hold gas-discharge tube, dc breakdown voltage U13=U12+U23.

Still further, since described gas-discharge tube itself is opened a way, impedance is big when lightning protection device is installed in circuit In other devices connected in parallel, so voltage is applied to varistor MOV1 and MOV2, shunt capacitance C1 and C2, partial pressure triggering electricity On road 101, the capacitor of the varistor MOV1 and MOV2 are at nF grades, and the resistance of the partial pressure trigger circuit 101 is in M Ω Grade, capacitor are nF grades, and the shunt capacitance C1 and C2 are increased or decreased according to the actual situation, but its numerical value is at nF grades, At this moment if L/N pin is between PE, there are specified power-frequency voltages, and L/N is to then there is uA grades of electric currents between PE；Institute at this time The voltage at the both ends gas-discharge tube GDT stated mainly by the partial pressure trigger circuit 101 and the varistor MOV1 and MOV2 is determined that capacitive reactance of the setting triggering capacitor C3 under power frequency is equal to the resistance R1 of several times, thus maintains partial pressure effect It is approximately resistance circuit, the representative value of the partial pressure trigger circuit 101 is set as R1=1.2M Ω, R2=1M Ω, C3= The direct current starting voltage value of 1nF, the gas-discharge tube GDT can be according to the power-frequency overvoltage to be resistant to settings, representative value May be set to: UG12=UG23=1000V can be adjusted its value according to different system requirements, reach different pressure voltages Demand.

When high-pressure system overvoltage does not occur in route, direct current starting voltage representative value is set as 1200V, and lightning protection device is between PE Electric current be mA grade, the discharge tube GDT both end voltage be U13=930V, wherein U12=U23=465V, peak value are 660V is less than gas-discharge tube GDT direct current and starts voltage representative value, and gas-discharge tube GDT will not be acted under this voltage, product In tolerance status, it will not damage or thread off.

When lightning surge voltage or electric current occurs in route, since the time of surge voltage electric current is at us grades, so at this time The capacitive reactance for triggering capacitor C3 is much smaller than resistance R1, so R1 can be bypassed, when overvoltage reaches predetermined value, the gas is put The endpoint 2 of fulgurite GDT, 3 both ends of endpoint can be first breakdown, due to varistor MOV1 after endpoint 2, the breakdown of 3 both ends of endpoint and MOV2 has been started up, in order to avoid residual voltage on the varistor MOV1 and MOV2 and endpoint 1,2 both ends gas discharge of endpoint Excessively high voltage value is caused when the starting voltage superposition of pipe GDT, this circuit uses the three-end air discharging pipe with Trigger Function, this Sample after the endpoint 2 of the gas-discharge tube GDT, endpoint 3 start, endpoint 1, endpoint 2 starting voltage can be than endpoint 2, end Low 200V in 3 ends of point or so, and the effect of the shunt capacitance C1 and C2 are to generate high frequency point in the gas-discharge tube GDT Using its logical high frequency characteristics when peak operation voltage, the high-frequency current that a part passes through varistor MOV1 and MOV2 is shunted, is reduced The synergistic effect of varistor MOV1 and MOV2 residual voltage and discharge tube GDT endpoint 1,2 operation voltage of endpoint, so that it is whole to reach protection The purpose of a circuit；Meanwhile when having overvoltage to occur in route, under the action of overvoltage, the fuse F1 and F2 are very Reach its blowout current, fuse failure fastly, and then indicating circuit has been turned on；It indicates that product lightning protection function is no longer valid, reminds more It changes.

Finally, it should be noted that the above is only one of specific application examples of the invention, in actual application Take the circumstances into consideration selection substitution component as the case may be, but the protection scope of invention is not limited in any way.

Claims

1. divide triggering symmetrical overvoltage lightning protection circuit comprising protection fuse F1 and F2, varistor MOV1 and MOV2, Shunt capacitance C1 and C2, gas-discharge tube GDT, it is characterised in that: it further include a partial pressure trigger circuit, the partial pressure triggering Electric routing resistance R1, capacitor C3, resistance R2 composition, the resistance R1 and the capacitor C3 form a parallel circuit, then with it is described The endpoint 1 of gas-discharge tube GDT, endpoint 2 it is in parallel, the also parallel connection between the endpoint 2, endpoint 3 of the gas-discharge tube GDT There is a resistance R2；The partial pressure touching is connected to after the varistor MOV1 and MOV2 is in parallel with shunt capacitance C1 and C2 Power Generation Road, the front end varistor MOV1 and MOV2 are also connected with protection fuse F1 and F2, protection the fuse F1 and F2 Access the positive L and cathode N of power supply.

2. the symmetrical overvoltage lightning protection circuit of partial pressure triggering according to claim 1, it is characterised in that: the bypass Capacitor C1 and C2 is in parallel with varistor MOV1 and MOV2, relative to the capacitive reactance of shunt capacitance C1 and C2, the varistor The high resistance state of MOV1 and MOV2 is considered open circuit, and plays the role of bypass in gas-discharge tube GDT movement and reduce lightning protection Device residual voltage.

3. the symmetrical overvoltage lightning protection circuit of partial pressure triggering according to claim 1, it is characterised in that: the partial pressure Trigger circuit carries out power frequency partial pressure and surge triggering.

4. the symmetrical overvoltage lightning protection circuit of partial pressure triggering according to claim 1, it is characterised in that: the fuse F1 and F2 is indicator type fuse, current mode fuse, temperature mode fuse, and fuse F1 and F2 have functional indicia, fusing or non- Show that label is different when blown state.

5. the symmetrical overvoltage lightning protection circuit of partial pressure triggering according to claim 1, it is characterised in that: the gas Body discharge tube GDT is band Trigger Function three-end air discharging pipe, dc breakdown voltage U13=U12+U23.

6. the symmetrical overvoltage lightning protection circuit of partial pressure triggering according to claim 1, it is characterised in that: the pressure The capacitor of quick resistance MOV1 and MOV2 is at nF grades, and the resistance of the partial pressure trigger circuit (101) is at Ω grades of M, capacitor nF Grade, the shunt capacitance C1 and C2 are increased or decreased according to the actual situation, but its numerical value is at nF grades.