CN2454970Y

CN2454970Y - DC lightning arrestor

Info

Publication number: CN2454970Y
Application number: CN 00258113
Authority: CN
Inventors: 马强; 王玉山
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-10-16
Filing date: 2000-10-16
Publication date: 2001-10-17
Anticipated expiration: 2010-10-16

Abstract

The utility model relates to a direct current lightning protection device, which can realize self-check function. The utility model comprises a voltage dependent resistor R, and further comprises a capacitor C1, a capacitor C2, a linked switch K which comprises a switch K-3 and a switch K-4 acting simultaneously and a luminescence unit D2. After connected in series with the capacitor C1, the switch K-3 is connected in parallel with the voltage dependent resistor R, and the capacitor C1 is connected to the position of the first end of the voltage dependent resistor R. After connected in series with the capacitor C2, the switch K-4 is connected in parallel with the voltage dependent resistor R, and the capacitor C2 is connected to the position of the second end of the voltage dependent resistor R. The luminescence unit D2 is connected in series between a hanging terminal under the state of work of the switch K-3 and a hanging terminal under the state of work of the switch K-4.

Description

The direct current lightning arrester

The utility model relates to the application electric technology field, particularly relates to lightning protection equipment, uses the equipment of DC power supply to exempt from thunderbolt in order to protection and destroys.

Communication equipments such as exchange at present, transmission all adopt DC power-supply system, for guaranteeing that communication quality is provided with a utmost point ground connection of battery in the DC power-supply system, plus earth just, when its purpose is that interoffice adopts the direct current relaying, utilize the earth to make a lead, also in order to reduce cross-talk and the electromagnetic interference that suppresses in the communication line between the communication loop.

Thunder and lightning is the natural phenomena in a kind of atmosphere, endangers very greatly, but be difficult for to take precautions against.Usually people have noticed overvoltage, the overcurrent protection to the subscriber line circuit of programme-controlled exchange, particularly by the over-voltage over-current protection problem of subscribers feeder position main frame to subscriber line circuit.Recent years people just notice on the communication equipment supply lines to the protection question of overcurrent, overvoltage.

Be applied in the lightning arrester on the communication equipment supply lines in the prior art, its major technique is exactly to add pressure-sensitive resistance between the both positive and negative polarity of power line, surpass piezo-resistance value limit once two interpolar voltages occur, piezo-resistance i.e. action rapidly, and positive and negative voltage across poles is clamped down on.But the shortcoming of this prior art is not have self-checking function, and the self check poor operability once piezo-resistance is damaged in protection process, is difficult to be found.

The object of the present invention is to provide a kind of direct current lightning arrester, the self-checking function of its setting can be checked the user very easily to lightning-arrest function.

The object of the present invention is achieved like this: a kind of direct current lightning arrester, include in order to be connected in parallel on the piezo-resistance R of protected DC power supply two interpolars, it is characterized in that further including: capacitor C1, capacitor C2, the linked switch K and the luminescence unit D2 that include two groups of K switch of moving simultaneously-3, K switch-4; In parallel after wherein said K switch-3 is connected with capacitor C1 with described piezo-resistance R, and capacitor C1 is connected in the first end place of piezo-resistance R; In parallel after described K switch-4 is connected with capacitor C2 with described piezo-resistance R, and capacitor C2 is connected in the second end place of piezo-resistance R; And following in working order unsettled terminals of described K switch-3, and between the unsettled down in working order terminals of described K switch-4, be in series with described luminescence unit D2.

Preferably, described linked switch K further includes the K switch-1 of moving simultaneously with described K switch-3 and described K switch-4, is arranged at any utmost point of protected DC power supply.

Preferably, described linked switch K further includes the K switch-1 and the K switch-2 of moving simultaneously with described K switch-3 and described K switch-4, is separately positioned on the two poles of the earth of protected DC power supply.

Preferably, described luminescence unit is a light-emitting diode.

Preferably, this device further includes, and is connected in parallel on the heavy-duty diode D1 of protected DC power supply two interpolars, and its positive pole links to each other with the hot end of protected DC power supply.

Preferably, this device further includes, and shell has the magnet that is used for being adsorbed on the protected equipment in the outside or the internal fixation of described shell.

Under user mode; device of the present utility model links to each other with the two poles of the earth of protected DC power supply; when thunderbolt or induction make magnitude of voltage that the voltage Vac at the two poles of the earth of protected DC power supply surpasses piezo-resistance R in limited time, piezo-resistance R conducting makes Vac clamp down on magnitude of voltage limit at piezo-resistance R.When the lightning arrester self check, disconnect protected power supply, the K that closes a switch (also can be set at and open K switch); if D2 glimmers; prove that then this protective device works under high pressure conditions, if not flicker of D2 proves then that piezo-resistance R has damaged should change.

Direct current lightning arrester of the present utility model, the principle of utilizing the voltage of electric capacity charging and series capacitance to raise has realized the self-checking function to lightning-arrest main circuit dexterously.The user can check lightning-arrest function very easily, be convenient to safeguard.

For making the purpose of this utility model, principle and advantage clearer, by the following examples, the utility model is further described.Wherein

Fig. 1 shows the electrical schematic diagram according to a preferred embodiment of the present utility model;

Fig. 2 show device of the present utility model under user mode with the schematic diagram that is electrically connected of protected communication equipment.

For solving routine test and analogue simulation problem, guarantee that lightning arrester is in normal operating conditions, has designed the utility model.

The principle that the utility model utilizes capacitor charge and discharge and series voltage to raise has designed customary self check simulation test circuit.Fig. 1 shows the electrical schematic diagram according to a preferred embodiment of the present utility model.Fig. 2 show device of the present utility model under user mode with the schematic diagram that is electrically connected of protected communication equipment.As shown in Figure 1, this device passes through a, b, and 3 of c are parallel to protected equipment.Wherein K switch-1, K-2, K-3, K-4 are one group of linked switch K that moves simultaneously, in working order (promptly as Fig. 1), K switch-1, K-2 closure, K switch-3, K-4 connect as figure, make capacitor C 1, C2 charging, the magnitude of voltage that thunderbolt or induction make Vac surpass piezo-resistance R is prescribed a time limit, and the R conducting is clamped down at the magnitude of voltage of R Vac and limit.

Further include in the present embodiment; be connected in parallel on the heavy-duty diode D1 of protected DC power supply two interpolars; its positive pole links to each other with the hot end of protected DC power supply; when Vc＞Va (Vb) 0.3V; the D1 conducting is clamped down at 0.3V Vac; so just solved the protection question when negative potential raises, the protection to protected DC power supply further is provided.

When pressing K switch, this device disconnects with protected equipment, enters the state of testing oneself.At this moment, the stiff end of K switch-3, K-4 all is connected to another following in working order at ordinary times unsettled terminals, causes capacitor C1, C2 discharged in series; voltage is the voltage sum of two capacitors, more than 90V, causes the R conducting; D2 glimmers, and this protective device works when proving high pressure.

Wherein piezo-resistance R and fast reaction diode D1 are Primary Component, and in the present embodiment, it is the nanosecond device.By different choice this lightning protection device is applied on the equipment of dissimilar protected DC power supply to R and D1.With identical shunt capacitance is converted to the principle of series capacitance, can improves test voltage, more fill part validity of this product of proof by the quantity that increases electric capacity in the test loop.

In the present embodiment, except that having the piezo-resistance shocking preventing technology, increased the high-power fast reaction diode of reverse installation, the anticathode current potential raises and inhibitory action has been played in the harm of equipment.Having increased is the self-checking circuit in loop with the series capacitance, and in the time of can simulating the above operating voltage of twice even twice, the validity of the pressure-sensitive lightning protection partial function of this product simultaneously also can customary this product of self check, is convenient to safeguard.

Preferably, be the inconvenience of avoiding installing, can design built-in strong magnets, directly be adsorbed on the protected equipment during installation, make installment work reach the easiest.

Preferably, can design open type binding post and pulling and inserting type connector, make when for the communication equipment that is moving this product being installed, the interruption of need not cutting off the power supply can chargedly be installed.

More than lift preferred embodiment, the utility model is had been described in detail, it is interpreted as the utility model of explaining, and should not be construed as restriction of the present utility model.

Claims

1, a kind of direct current lightning arrester, include in order to be connected in parallel on the piezo-resistance R of protected DC power supply two interpolars, it is characterized in that further including: capacitor C1, capacitor C2, the linked switch K and the luminescence unit D2 that include two groups of K switch of moving simultaneously-3, K switch-4; Wherein

In parallel after described K switch-3 is connected with capacitor C1 with described piezo-resistance R, and capacitor C1 is connected in the first end place of piezo-resistance R; In parallel after described K switch-4 is connected with capacitor C2 with described piezo-resistance R, and capacitor C2 is connected in the second end place of piezo-resistance R; And following in working order unsettled terminals of described K switch-3, and between the unsettled down in working order terminals of described K switch-4, be in series with described luminescence unit D2.

2, direct current lightning arrester as claimed in claim 1 is characterized in that, described linked switch K further includes the K switch-1 of moving simultaneously with described K switch-3 and described K switch-4, is arranged at any utmost point of protected DC power supply.

3, direct current lightning arrester as claimed in claim 1 is characterized in that, described linked switch K further includes the K switch-1 and the K switch-2 of moving simultaneously with described K switch-3 and described K switch-4, is separately positioned on the two poles of the earth of protected DC power supply.

4, direct current lightning arrester as claimed in claim 1 is characterized in that, described luminescence unit is a light-emitting diode.

5, direct current lightning arrester as claimed in claim 1 is characterized in that further including, and shell has the magnet that is used for being adsorbed on the protected equipment in the outside or the internal fixation of described shell.

6, as claim 1,2,3,4 or 5 described direct current lightning arresters, it is characterized in that further including, be connected in parallel on the heavy-duty diode D1 of protected DC power supply two interpolars, its positive pole links to each other with the hot end of protected DC power supply.