CN203180510U - Combined overvoltage protector of resistance capacitance lightening arrester - Google Patents

Abstract

The utility model relates to a combined overvoltage protector of a resistance capacitance lightening arrester, which comprises the following components: a non-linear resistor R, a linear resistor r, a capacitor C, a discharging gap G, a phase line A, a phase line B, a phase line C and a ground line D. The combined overvoltage protector of the resistance capacitance lightening arrester is characterized in that: the linear resistor r is firstly connected with the capacitor C in series and is connected with the discharging gap G in parallel, thereby forming a discharging loop; the discharging loop is connected with the non-linear resistor R in series for forming a lightening arrester loop which integrally forms a protecting component branch circuit; one end of each protecting component of the protecting components is connected with one end of each of the other protecting components for forming a neutral point, and the other end is connected with the phase line A, the phase line B, the phase line C and the ground line D for forming four protecting component branch circuits. The combined overvoltage protector of the resistance capacitance lightening arrester settles a problem in the prior-art protector, namely incapability of comprehensively protecting electrical equipment from lightening overvoltage and high-amplitude overvoltage. The combined overvoltage protector of the resistance capacitance lightening arrester provided by the utility model has the following functions: quickly damping frequency and damping oscillation of high-frequency oscillation, reducing amplitude of overvoltage, and obtaining double functions of the lightening arrester and a resistance capacitance absorber. The combined overvoltage protector of the resistance capacitance lightening arrester has the following advantages: compact and firm circuit structure, high stability, energy-saving performance, high safety, high efficiency, and high convenience in mounting.

Description

Capacitance-resistance lightning arrester combined type overvoltage protection device

Technical field

The utility model relates to emergency protective circuit device technique field, is specifically related to a kind of capacitance-resistance lightning arrester combined type overvoltage protection device.

Background technology

The electric equipment that moves in the electric power system is bearing various overvoltage: outside lightning overvoltage; Because system suits operation, earth fault, parameter variation, electromagnetic energy generation vibration, thereby gathers internal overvoltage that causes etc.These overvoltage are usually damaged the insulation of electric equipment, cause the accident.The cut-off overvoltage that produces when wherein circuit breaker (vacuum switch, contactor etc.) is operated and the overvoltage of restriking, often be accompanied by very high frequency of oscillation and amplitude again, these overvoltage make load equipment (as transformer, motor, generator, reactor etc.) winding inter-turn insulation breakdown, damage equipment.Limit the amplitude of lightning overvoltage and some switching overvoltage in the prior art with lightning arrester or three phase combined lightning arrester (being three phase combined over-voltage protector again).Yet these equipment are slow to higher-order of oscillation overvoltage response speed, are unable to catch up with the pace of change of higher-order of oscillation frequency, just can not change frequency of oscillation with its superpotential amplitude and the wave head steepness of decaying.Existing rc absorber; though energy is the frequency of attenuated oscillation process rapidly; reduce the overvoltage amplitude to alleviate the wave head steepness; but it is little that it absorbs the overvoltage ability; and can not protect electric equipment to avoid the infringement of the high switching overvoltage of lightning overvoltage and amplitude; want consumed energy from normal operation the time, be subject to the interference of high order harmonic component and unusual sending out damaged, especially it makes electrical network increase the additional capacitor electric current and influences the stability of electrical network.

Summary of the invention

The purpose of this utility model provides a kind of capacitance-resistance lightning arrester combined type overvoltage protection device, and its technical concrete advantage is: one, four branch roads are three-phase and quadrupole formula (four stars shape connection) structure; Two, autocontrol inserts electrical network automatically, does not provide additional capacitor to electrical network; Three, all elements are sealed in insulation crust and the silastic material, realize all insulation structure; Four, the nonlinear resistance discharge capacity is tens times of general rc absorber linear resistance thermal capacity; Five, small product size is little, is applicable in the cabinet to install and use.

For overcoming the deficiencies in the prior art, realize above-mentioned purpose, the utility model is achieved in that a kind of capacitance-resistance lightning arrester combined type overvoltage protection device, four pole type lightning arrester and double loop rc absorber are combined dexterously, and it comprises nonlinear resistance R, linear resistance r, capacitor C, discharging gap G, phase line A, phase line B, phase line C and ground wire D; It is characterized in that: described linear resistance r connects with capacitor C earlier, and is in parallel with discharging gap G afterwards, forms a discharge loop, and this discharge loop is connected with nonlinear resistance R, forms a lightning arrester loop, protection component branch road of the whole formation in this loop; One end of its each protection component is interconnected to form a neutral point O, and the other end is connected with phase line A, phase line B, phase line C and ground wire D respectively, forms four protection component branch roads.

Capacitor C of the present utility model is the capacitor that forms with the flame retardant insulation material embedding, and its interpolar adopts high-quality high insulating property polypropylene metallization plated film; Nonlinear resistance R is the ZnO resistors of non-linear voltage-current characteristic.

Advantage of the present utility model is: circuit structure is compact firmly, stabilizing energy-saving, safe and efficient, be convenient to install.

Description of drawings

Fig. 1 is capacitance-resistance lightning arrester combined type overvoltage protection device schematic diagram.

Embodiment

Execution mode below in conjunction with accompanying drawing is described in further detail the utility model:

As shown in Figure 1, the utility model is a kind of capacitance-resistance lightning arrester combined type overvoltage protection device, comprising: nonlinear resistance R1, linear resistance r2, capacitor C3, discharging gap G4, phase line A5, phase line B6, phase line C7 and ground wire D8.Linear resistance r2 connects with capacitor C3 earlier; in parallel with discharging gap G4 afterwards; form a discharge loop; linear resistance r2 is set at certain certain resistance; when clearance G 4 disruptive discharges in order to suppress discharging current; prevent that discharging gap G4 from being burnt out by excessive electric current; this discharge loop is connected with nonlinear resistance R1; form a lightning arrester loop; when the lightning overvoltage of invasion or some switching overvoltage when reaching the amplitude of setting; discharging gap G disruptive discharge; be somebody's turn to do lightning-arrest loop conducting; the overvoltage amplitude limitation is discharged the overvoltage energy to set point and absorption; exempted the harm to protected equipment, protection component branch road of the whole formation in this loop, an end of its each protection component is interconnected to form a neutral point O; the other end respectively with phase line A5; phase line B6; phase line C7 is connected with ground wire D8, forms four protection component branch roads.Described capacitor C3 is the capacitor that forms with the flame retardant insulation material embedding, and its interpolar adopts high-quality high insulating property polypropylene metallization plated film; Nonlinear resistance R1 is the ZnO resistors of non-linear voltage-current characteristic, electric current is minimum in normal operation, resistance is very big, be equivalent to insulator, in case invading when reaching a certain amplitude, overvoltage will conducting become conductor, its resistance is inversely proportional to electric current again under this state, along with the increase resistance value of electric current diminishes thereupon, so electric current increases, ohmically pressure drop is risen very little.

Expression four branch roads (being protection component) in the frame of broken lines, A, B, C, D are respectively A phase line, B phase line, C phase line and the ground wire of protected equipment.The formation of every branch road is: variable resistor R and below it in shunt circuit linear discharge resistance r, the dry type capacitor C on the left side be composed in series the rc absorber loop, variable resistor R and below it in shunt circuit the discharging gap G on the right be composed in series the lightning arrester loop, compact and combine dexterously.O is the common point (neutral point) that an end of four branch roads links together, and its other end is connected on A phase line, B phase line C phase line and the ground wire D of protected equipment, and wherein: AOD, BOD, COD constitute the protection relatively of A phase, B phase, C phase respectively; AOB, BOC, AOC constitute the overvoltage protection that A～B is alternate, B～C is alternate and A～C is alternate respectively.

Under the normal operating conditions, because the non-linear voltage-current characteristic of non-linear variable resistor R, this moment, the resistance of resistance R was very big, the electric current that flows through has only ten microamperes, be equivalent to the insulator crosscut between the phase line and r, C G that be connected in series and that be connected in parallel with it of electrical network, that is to say that rc absorber does not insert network system (discharging gap G more not can disruptive discharge), consumed power does not provide capacitance current to system yet; When the overvoltage amplitude that produces in the vacuum switching manipulation arrives a certain set point (flex point of volt-ampere characteristic); resistance R begins conducting; this is called the origination action voltage of rc absorber; rc absorber inserts network system automatically; and when overvoltage surpasses set point; then enter the flat site of non-linear resistance volt-ampere characteristic; resistance R becomes conductor; rc absorber is very rapidly brought into play the effect of damped oscillation and attenuated oscillation frequency; the superpotential frequency decay of the higher-order of oscillation is slowly got off; its overvoltage amplitude also will reduce greatly, protect the insulation of protected equipment to avoid the superpotential damage of the higher-order of oscillation.When the lightning overvoltage invasion attacks; the overvoltage amplitude reaches the then breakdown discharge of G of set point of discharging gap G; the lightning surge electric current is by the lightning arrester loop, and the overvoltage amplitude limitation in the appropriate value that does not endanger protected apparatus insulated damage, and is absorbed and discharges the lightning overvoltage energy.Again by r, C, G loop as seen, when the amplitude of some switching overvoltage higher, the r on the left side, the charging of C series circuit, because the stack of the voltage on r, the C, also can reach the amplitude of the breakdown discharge of clearance G, transfer R, the action conducting of G lightning arrester loop this moment to, switching impulse ripple electric current is by the lightning arrester loop, the switching overvoltage amplitude limitation is got off, and absorb releasing operation overvoltage energy.After overvoltage was gone over, resistance R was recovered state of insulation again, and normal operation recovers in system.

The utility model capacitance-resistance lightning arrester combined type overvoltage protection device is not limited to the above embodiments.Those skilled in the art make the change of unsubstantiality, all fall into protection range of the present utility model.

Claims (2)

1. capacitance-resistance lightning arrester combined type overvoltage protection device comprises: nonlinear resistance R(1), linear resistance r(2), capacitor C(3), discharging gap G(4), phase line A(5), phase line B(6), phase line C(7) and ground wire D(8); It is characterized in that: described linear resistance r(2) elder generation and capacitor C(3) connect, afterwards with discharging gap G(4) in parallel, form a discharge loop, this discharge loop and nonlinear resistance R(1) connect, form a lightning arrester loop, protection component branch road of the whole formation in this loop; One end of its each protection component is interconnected to form a neutral point O, the other end respectively with phase line A(5), phase line B(6), phase line C(7) with ground wire D(8) be connected, form four protection component branch roads.

2. a kind of capacitance-resistance lightning arrester combined type overvoltage protection device according to claim 1 is characterized in that: be the capacitor that forms with the flame retardant insulation material embedding described capacitor C(3), its interpolar adopts high-quality high insulating property polypropylene metallization plated film; Nonlinear resistance R(1) is the ZnO resistors of non-linear voltage-current characteristic.

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