CN2192979Y

CN2192979Y - Start operation compensater for electric motor

Info

Publication number: CN2192979Y
Application number: CN 93232113
Authority: CN
Inventors: 毕超
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-10-28
Filing date: 1993-10-28
Publication date: 1995-03-22
Anticipated expiration: 2003-10-28

Abstract

The utility model provides a start operation compensator for electric motors, which is an auxiliary device of the motor and synthesizes the starting compensation and the power rate compensation into a whole. The structure of the utility model is composed of a lightning protector BL, an over current protector RD, a heat electric relay RJ, a knife switch KM, a capacitance compensating device CP, etc., wherein, the heat electric relay RJ, the knife switch KM and the over current protector RD are connected between a power wire ABC with three phases and the capacitance compensating device CP, and the lightning protector BL is connected between the power wire ABC with three phases and an earth wire in series. Compared with the prior art, the utility model has the characteristics of simple structure, easy installation, energy saving and torque increase, and is a product capable of replacing products in the prior art.

Description

Start operation compensater for electric motor

The purpose of this utility model provides a kind of motor electricity saving equipment, especially a kind of motor starting operation compensator.

Its natural power rate generally is on the low side in the power supply grid of industrial enterprise.The generation of its reactive current mainly occurs in asynchronous motor.Consumption for the compensation network reactive current, at present capacitor compensations that adopt more, its reason is that the capacitor compensation technology is simple, and is reliable, economical rationality, its installation form are divided into centralized compensation, grouping compensation and indivedual compensation (claiming dispersion compensation, local compensation again).Compensate each switchgear plant all at production GR-1 type, the low ﹠ high voltage power capacitor cabinet of models such as PGJ1 type for being used for centralized compensation and bigger grouping.But dispersion compensation does not then have ready-made method or complete equipment available so far.In recent ten years, along with energy-conservation economize on electricity cry is gradually high, people also gradually heightened awareness should be to disperse local compensation to: the most effective the most reasonable compensation way.Therefore power supply department requires the user to adopt dispersion compensation and local compensation as far as possible, to reach the purpose of electricity saving and energy saving and raising power supply quality.

When net capacity is big inadequately, to starting bigger asynchronous motor (more than the 30KW) in order to reduce the impact of starting current, the essential starting equipment that adopts to electrical network.At present commonly used have self-coupling decompression starting compensators such as QJ01 type, QJ10 type, XQ01 type; Star-delta starters such as QX3 type, QX4 type; Frequency-sensitive variable-resistance started cabinet such as XQP type, GTT6121 type (case) etc.The moving equipment of these startings all plays in starting process and reduces the starting current effect, changes normal operation in case starting finishes, and this effect promptly disappears.Therefore the deficiency that has cost height, complex structure, function singleness.

The purpose of this utility model provides a kind of STCP starting compensatory and power rate and compensates motor starting operation compensator in one.

The purpose of this utility model realizes in the following manner, inserts lightning arrester BL, overcurrent protector RD, knife switch KM, thermal relay RJ and capacitive compensator CP on threephase asynchronous three-phase power line.Lightning arrester BL is serially connected with between the three-phase power line and ground wire of threephase asynchronous, and overcurrent protector RD, knife switch KM and thermal relay RJ are serially connected with between capacitive compensator CP and the threephase asynchronous three-phase power line.

Figure of description 1 is the circuit theory diagrams of the utility model compensator;

Figure of description 2 is that first kind of the utility model compensator uses winding diagram;

Figure of description 3 is that second kind of the utility model compensator uses winding diagram;

Figure of description 4 is the third use winding diagram of the utility model compensator.

Describe in detail below with reference to Figure of description the utility model being done;

Motor starting operation compensator of the present utility model is by lightning arrester BL; overcurrent protector RD; knife switch KM; thermal relay RJ and capacitive compensator CP form; overcurrent protector RD; knife switch KM and thermal relay RJ are serially connected with three-phase power line ABC and electric capacity is mended between the device CP; lightning arrester BL is serially connected with between three-phase power line ABC and the ground wire; capacitive compensator CP is formed by three capacitor triangle serial connections; thermal relay RJ; knife switch KM and overcurrent protector RD are that each is by three bimetal type thermal relays; knife switch and fuse are formed side by side, and per two capacitor series point all is connected in series a thermal cutout among the capacitive compensator CP; on knife switch and the fuse phase line in three-phase power line ABC.Lightning arrester BL is made up of three piezo-resistances, an end of three piezo-resistances ground connection that connects together, and a phase line in the other end each and three phase lines of power line ABC is joined, and ABC three phase terminals three-phase power line direct and motor joins.

Motor starting loop and control loop in the Figure of description 2,3,4 are known technology, are not described in detail at this.

Embodiment:

It is identical that compensator of the present utility model and existing compensator are installed and used, but STCP starting compensatory and power rate can be compensated in one, promptly as STCP starting compensatory again as the power rate compensation, realize dual-use material and reduce volume, reduce cost, easy to install etc.

Compensator is from the nearest electric control gear of motor, but use the utility model can thoroughly be realized indivedual compensation and local compensation to motor, can improve the electrical network power rate, improve quality of voltage, reduce circuit loss, and reduce pressure drop, improve starting torque, improve starting performance, therefore have small investment, volume is little, simple in structure, easy to implement, save characteristics such as electric energy, have good value for applications.

Claims

1, motor starting operation compensator; comprise lightning arrester BL, overcurrent protector RD, thermal relay RJ, capacitive compensator CP and knife switch KM etc.; it is characterized in that: thermal relay RJ, knife switch KM and overcurrent protector RD are serially connected with between three-phase power line ABC phase line and the capacitive compensator CP, and lightning arrester BL is serially connected with between power line ABC phase line and the ground wire.

2, compensator according to claim 1; it is characterized in that capacitive compensator CP is formed by three electric capacity triangle serial connections; thermal relay RJ, knife switch KM and overcurrent protector RD be each by three bimetal leaf type thermal relays, knife switch and fuse are formed side by side.

3, compensator according to claim 2 is characterized in that a point of per two capacitor series of capacitive compensator (1) all is connected in series thermal relay, knife switch and a fuse on a phase line of three-phase power line.

4, compensator according to claim 1 is characterized in that lightning arrester BL is made up of three piezo-resistances, an end of three piezo-resistances ground connection that connects together, and a phase line in the other end each and three phase lines of power line ABC is joined.

5, compensator according to claim 1 is characterized in that the ABC three phase terminals three-phase power line direct and motor of compensator joins.