CN2154552Y

CN2154552Y - Anti-exploisive reactive compensation vacuum electromagnet starter

Info

Publication number: CN2154552Y
Application number: CN 93207023
Authority: CN
Inventors: 王永祥
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-03-18
Filing date: 1993-03-18
Publication date: 1994-01-26
Anticipated expiration: 2003-03-18

Abstract

The utility model relates to an anti-explosive reactive compensation vacuum electromagnet starter which is used in the bad situation of working environment in the mine. The starter comprises a vacuum electromagnetic switch, a comprehensive motor protector and a reactive compensating device. It can be used as a start/stop switch of the load electric motor. And from the starting of the motor, the starter carries out the reactive compensation for the electric network to enhance the power factor of the electric network and the terminal voltage effectively, and diminish the electric energy loss, which makes the heavy-load starting electric motor start easily. At the same time, the comprehensive protector has the protecting functions of loss of voltage, overload, short circuit, loss of phase and electricity leakage shutting for the electric motor.

Description

Anti-exploisive reactive compensation vacuum electromagnet starter

The application relates to a kind of flame-proof type reactive power compensation vacuum electromagnetic starter of three phase induction motor, is applicable under the coal mine and uses.

Mining plant equipment, because the environmental condition of using is too poor, design selects for use the power of electric motor factor big, and power factor is pressed the 0.5-0.65 design, in addition, power supply distance is far away, the reactive loss of circuit and transformer is also quite big, especially starts moment, and electric current increases, the equipment starting difficulty, even burn out motor.Used though there is a kind of auto-reactive compensation device to drop into the down-hole in recent years, it can not be recompensed to reactive current in time in the moment of motor starting, generally needed about 15 seconds, and capacitor could input compensation.And existing explosion-proof vacuum electromagnetic starter does not have the power-saving technique measure of reactive power compensation.

The application's purpose is to disclose a kind ofly just can in time give the flame-proof type reactive power compensation vacuum electromagnetic starter of reactive power compensation in electric motor starting moment.

Existing explosion-proof vacuum electromagnetic starter is by explosion-proof tank and places the Vacuum Magnetic contactor in parallel with the load electrical network in the case that integrated protector for electric motor and control loop are formed.This starter can be directly with starting and the shutdown switch done load, its comprehensive protection device and control loop have at electrical network and occur playing the automatic blocking protective effect to motor under decompression, overload, short circuit, the phase failure and the electric leakage situation.

The application's technical scheme is that a reactive power compensation circuit also is set in existing explosion-proof vacuum electromagnetic starter, promptly with direct one group of building-out capacitor, repid discharge resistance and the capacitance-resistance absorption plant in parallel of load electrical network.Because asynchronous motor belongs to inductive load, current/voltage is asynchronous, and electric current is angle of lagging voltage always, and condenser current belongs to capacitive load, and also reactive current is ahead of voltage.Thereby inductance current and capacitive reactive power current opposite in direction.The utility model is directly in parallel with load end with compensating circuit, and when the vacuum Magnetic contactor was closed, the moment building-out capacitor of electric motor starting dropped into electrical network immediately, has just in time eaten up part of the electric current of motor, and the supply voltage that raise has improved power factor (PF).When motor stops, by the auxiliary contact of contactor discharge resistance is connected into the bifurcation type, be parallel to capacitor, make the capacitor repid discharge, to reach safety.In order to protect building-out capacitor, prolong capacitor useful life, all be serially connected with the protection inductance on every phase line of capacitor.

The utility model compared with prior art has: (1) can effectively improve power factor of electric network, reduces energy loss, improves quality of voltage, improves terminal voltage; (2) have switch, protection, the multinomial function of compensation.And can be at electric motor starting moment input compensation.

Below in conjunction with the embodiment accompanying drawing this application is described in further detail.

Accompanying drawing is the electrical schematic diagram of the embodiment of the present application.

As shown in the figure; flame-proof type reactive power compensation vacuum electromagnetic starter; contain Vacuum Magnetic contactor 1; be used to cut off or adhesive electric network source input 5 and load end 3 between electrically connect; the control loop and the integrated protector for electric motor 2 of being drawn by transformer 4 can carry out automatic blocking protective effect under decompression, overload, short circuit, the phase failure and the electric leakage situation to motor.In parallel with load end 3 also have one group of building-out capacitor C1 and C2; on every phase on line of building-out capacitor all serial connection protection inductance L 1 and L2 arranged; simultaneously in parallel also have one group of discharge resistance R1, R2, R3; and capacitance-resistance absorption plant RC, the connection contact K1 of discharge resistance and K2 are the auxiliary contacts of Vacuum Magnetic contactor 1.When contactor 1 adhesive, the motor starting running, building-out capacitor C1, C2 drop into the electric network reactive compensation operation simultaneously, the C1 that selects for use among the embodiment, C2 are two full film metallization capacitors of dry type, and L1, L2 are that two groups of reactors drop into shoving of moment in order to the limiting capacitance device, when contactor 1 disconnects, when motor stops, K1 and K2 connect, and discharge resistance R1, R2, R3 are connected into the bifurcation type and are parallel to capacitor, make the capacitor repid discharge to reach safety.The quantity of building-out capacitor and capacity are selected according to the size of load in the enforcement.

Claims

1, a kind of flame-proof type reactive power compensation vacuum electromagnetic starter; contain Vacuum Magnetic contactor, integrated protector for electric motor, load control loop and the explosion-proof tank in parallel, it is characterized in that also have one group building-out capacitor, repid discharge resistance and capacitance-resistance absorption plant in parallel with the load electrical network with the load electrical network.

2, flame-proof type reactive power compensation vacuum electromagnetic starter as claimed in claim 1, what it is characterized in that on the parallel three phase line of described building-out capacitor equal serial connections has a protection inductance element.