CN201707406U

CN201707406U - High-frequency electric dust-removing flashover detecting circuit

Info

Publication number: CN201707406U
Application number: CN2010201846908U
Authority: CN
Inventors: 王红星
Original assignee: BEIJING SHENGBANG TIANYE TECHNOLOGY Co Ltd
Current assignee: BEIJING SHENGBANG TIANYE TECHNOLOGY Co Ltd
Priority date: 2010-05-11
Filing date: 2010-05-11
Publication date: 2011-01-12
Anticipated expiration: 2020-05-11

Abstract

The utility model discloses a high-frequency electric dust-removing flashover detecting circuit, comprising a high-voltage end discharging loop and a flashover signal output end, wherein the high-voltage end discharging loop is provided with a flashover damping resistor; the flashover damping resistor is connected with four high-voltage capacitors which are connected in series; the high-voltage capacitor discharging current is collected by a Hall element; the Hall element is connected with a comparator circuit; the positive end of the comparator circuit is set with a fixed level, and the negative end thereof is used for collecting the flashover current through the Hall element; and the comparator level can be turned during flashover. The utility model adopts the hardware type to detect the high-frequency electric dust removing flashover; the flashover can be directly judged by the hardware type under the condition of low cost, and the signal is real and real-time.

Description

High-frequency electrical dedusting flashover testing circuit

Technical field

The utility model relates to a kind of high-frequency electrical dedusting flashover testing circuit.

Background technology

Electrostatic precipitator (being called for short ESP) ultimate principle is: ash-laden gas is by the high-voltage electrostatic field, and dust is collected in electric field, reaches the purpose of gas cleaning.For setting up the high-voltage electrostatic field, need high-voltage DC power supply.

ESP is the visual plant in the environmental protection field, is mainly used in plasma discharge, dedusting, demist, dehydration, air purification, high-effective dust-removing desulfurization, impurity separation and plurality of raw materials recovery etc.

The high-voltage electric field equivalence of ESP is R, C shunt load, and wherein C is the equivalent capacity of high-voltage electric field, is generally several thousand～several ten thousand PF, and R is a variable resistor, changes at any time with the ESP operating mode.As seen, ESP is fluctuating load, and is very big to the impact of its DC high-voltage power supply when flashover or short circuit take place, and must take corresponding measure to guarantee that power supply is reliable, stable operation for this reason, and need provide good power supply for ESP, satisfies ESP dedusting requirement.

Because the inherent characteristics of high frequency electric source can improve the power supply performance to ESP, and then improve the dust-collecting efficiency of ESP, the exploitation of high frequency electric source becomes a hot technology.

At present, along with the continuous increase of ESP area, the capacity of high frequency electric source can not satisfy user's needs, especially needs capacity more than the 80KV/1A in electric system, and the exploitation of high-power high-frequency power supply is subject to problems such as high-frequency loss, and being difficult to has big breakthrough.

There are characteristics such as high capacity, big, the frequent flashover of load variations in the working condition requirement of ESP, and all these problems all need the joint efforts of high frequency electric source producer, strive early settlement, produce the high frequency electric source product that satisfies market demand.

Under action of high voltage, the disruptive discharge that gas or liquid medium take place along insulating surface.Voltage during its discharge is called flashover voltage.After flashover took place, interelectrode voltage quickly fell to zero or approaches zero.Spark in the flashover passage or electric arc make the insulating surface local overheating cause charing, the damaging surface insulation.

The Electric Field Distribution on creeping discharge and solid dielectric surface has very big relation, and three kinds of typical case are arranged:

(1) solid dielectric is in the uniform electric field, Gu, the gas medium interphase is parallel to line of electric force.Seldom run into this situation on the engineering, be in situation in the non-uniform electric field slightly, in this moment electric discharge phenomena and the uniform electric field a lot of similarities are arranged but regular meeting runs into medium.

(2) solid dielectric is in the severe non-uniform electric field, and electric field intensity is more much bigger than the component that is parallel to the surface perpendicular to the component (hereinafter to be referred as vertical component) of dielectric surface.Sleeve pipe just belongs to this situation.

(3) solid dielectric is in the severe non-uniform electric field, but the component that is parallel to dielectric surface in most of local (except that the very zonule near the electrode) electric field intensity of dielectric surface is bigger than vertical component.

The utility model content

The utility model technical issues that need to address just are to provide a kind of high-frequency electrical dedusting flashover testing circuit, it adopts hardware mode that the flashover of high-frequency electrical dedusting is detected, hardware mode can directly be judged flashover under the not high prerequisite of cost, signal is true, real-time.

For addressing the above problem, the utility model adopts following technical scheme:

A kind of high-frequency electrical dedusting of the utility model flashover testing circuit, described circuit comprises high-pressure side discharge loop and flashover signal output terminal, a flashover damping resistance is arranged in the described high-pressure side discharge loop, described damping resistance connects the high-voltage capacitance of four series connection, described high-voltage capacitance discharge current is gathered by Hall element, described Hall element connects comparator circuit, described comparator circuit forward end is set a fixed level, the comparator circuit negative phase end is gathered flashover current by Hall element, makes the comparator level upset during flashover.

The utility model is by the flashover damping resistance, when being used to reduce flashover to the impact of transformer.High-voltage capacitance by four series connection is used for store charge, is caught by Hall element so that produce big electric current during flashover.By Hall element, catch current signal; Comparator circuit, forward end is set a fixed level, and negative phase end is gathered flashover current by Hall element then, makes the comparator level upset during flashover.

The utility model adopts hardware mode that the flashover of high-frequency electrical dedusting is detected, and hardware mode can directly be judged flashover under the not high prerequisite of cost, and signal is true, real-time.

Description of drawings

Fig. 1 is the utility model circuit theory diagrams.

Embodiment

As shown in Figure 1, a kind of high-frequency electrical dedusting of the utility model flashover testing circuit, described circuit comprises high-pressure side discharge loop and flashover signal output terminal, be provided with a flashover damping resistance RH13 in the described high-pressure side discharge loop, described flashover damping resistance connects the high-voltage capacitance Ch10 of four series connection, Ch11, Ch12 and Ch13, described high-voltage capacitance discharge current is gathered by Hall element T0, described Hall element connects comparator circuit U15B, described comparator circuit forward end is set a fixed level, the comparator circuit negative phase end is gathered flashover current by Hall element, makes the comparator level upset during flashover.

It should be noted that at last: obviously, the foregoing description only is for the utility model example clearly is described, and is not the qualification to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give exhaustive to all embodiments.And conspicuous variation of being extended out thus or change still are among the protection domain of the present utility model.

Claims

1. high-frequency electrical dedusting flashover testing circuit, described circuit comprises high-pressure side discharge loop and flashover signal output terminal; It is characterized in that: a flashover damping resistance is arranged in the described high-pressure side discharge loop, described damping resistance connects the high-voltage capacitance of four series connection, described high-voltage capacitance discharge current is gathered by Hall element, described Hall element connects comparator circuit, described comparator circuit forward end is set a fixed level, the comparator circuit negative phase end is gathered flashover current by Hall element, makes the comparator level upset during flashover.