CN101908852A - Power-saving Y-delta starter of motor - Google Patents

Abstract

The invention relates to a power-saving Y-delta starter of a motor, comprising a breaker QF, a thermal relay FT and an ammeter indicating circuit connected with a current relay LJ, wherein the breaker QF, the thermal relay FT and the ammeter indicating circuit are connected between the three phase lines L1, L2, and L3 of the motor and three terminals U1, V1 and W1 of the motor; a stop button SB1, a start button SB2 and an intermediate relay ZJ are connected between two phases of the motor; the main circuit of the motor adopts connection and disconnection of the breaker to control the power supply of the motor instead of a master contactor; the current relay is connected in the ammeter indicating circuit in series, and the intensity of current passing through the relay and the action of the relay as well as a return current value are used as a control limit value for setting Y-delta automatic conversion; and an AC contactor KMdelta main contact is connected between the three phase lines of the motor and another three terminals of the motor, and an AC contactor KMY main contact is connected between the AC contactor KMdelta main contact and another three terminals of the motor, thus the power-saving Y-delta starter has good power saving performance, safety, reliability, economy and practicability.

Description

Power-saving Y-delta starter of motor

Technical field

The present invention relates to a kind of power-saving Y-delta starter of motor that can improve the performance driving economy of motor.

Background technology

According to the statistics made by the departments concerned, in the general electromechanical equipment of, heavily loaded alternate run light at blower fan, water pump and some, the power consumption of motor accounts for 1/3 of China's total electricity consumption.Therefore, improve their performance driving economy, economize on electricity is had crucial realistic meaning.

Summary of the invention

The objective of the invention is to overcome the deficiencies in the prior art and provide a kind of in the major loop of motor without main contactor, but utilize the connection of circuit breaker and cut-off the power supply of controlling motor, in the ammeter of Current Transformer Secondary side indication loop, be connected in series current relay, utilize size and action and return current value be used as the adjust Y-△ automatically power-saving Y-delta starter of motor of the control limit value of conversion of relay by electric current.

The object of the present invention is achieved like this: comprise being connected motor triple line L1, L2, three terminal U1 of L3 and motor, V1, circuit breaker Q F between the W1, thermal relay FT and be serially connected with current relay LJ ammeter indicating circuit, it is characterized in that: be connected with stop button SB1 by fuse FU1 and FU2 between mutually at the L1 of motor and L3, starting button SB2, the normally-closed contact of intermediate relay ZJ and thermal relay FT, be connected with the normally opened contact 1SJ1-1 of the time relay at the two ends of intermediate relay ZJ, the normally-closed contact KMY1-2 of A.C. contactor, the coil of the normally-closed contact 2SJ1-2 of the time relay and A.C. contactor KM △, be connected with the normally opened contact KM △ 1-1 of A.C. contactor at the two ends of the normally opened contact 1SJ1-1 of the time relay, be connected with the normally-closed contact 1SJ1-2 of the time relay at the two ends of intermediate relay ZJ, the coil of A.C. contactor KMY, the normally-closed contact KM △ 1-2 of A.C. contactor, between the coil of the normally-closed contact 1SJ1-2 of the time relay and A.C. contactor KMY, be connected with the normally opened contact LJ1-1 of current relay LJ and the coil 1SJ of the time relay, be connected with the normally-closed contact LJ1-2 of current relay LJ at the two ends of intermediate relay ZJ, the normally opened contact ZJ2-1 of auxiliary relay and the coil 2SJ of the time relay, the normally opened contact ZJ1-1 of connect hours relay between the front end of the normally opened contact 1SJ1-1 of the front end of starting button SB2 and the time relay; Be connected with normally-closed contact ZJ1-2, indicator light YD and the normally opened contact KMY1-1 of A.C. contactor and the normally opened contact KM △ 2-1 of indicator light RD and A.C. contactor of the indicator light GD and the time relay at the two ends of stop button SB1, starting button SB2 and intermediate relay ZJ; Between motor triple line L1, L2, L3 and motor other three terminal U2, V2, W2, be connected with the main contacts of A.C. contactor KM △, between the main contacts of A.C. contactor KM △ and motor other three terminal U2, V2, W2, be connected with the main contacts of A.C. contactor KMY.

The present invention without main contactor, but utilizes the connection of circuit breaker and cut-offs the power supply of controlling motor in the major loop of motor; Current relay of serial connection in the ammeter of Current Transformer Secondary side indication loop utilizes size and action and return current value be used as the adjust Y-△ automatically control limit value of conversion of relay by electric current.Therefore the present invention has good, safe and reliable, the economical and practical advantage of electricity saving performance.

Description of drawings

Fig. 1 is power-saving Y-delta starter of motor control principle figure of the present invention.

Embodiment

As shown in Figure 1, the present invention includes and be connected motor triple line L1, L2, three terminal U1 of L3 and motor, V1, circuit breaker Q F between the W1, thermal relay FT and be serially connected with current relay LJ ammeter indicating circuit, it is characterized in that: be connected with stop button SB1 by fuse FU1 and FU2 between mutually at the L1 of motor and L3, starting button SB2, the normally-closed contact of intermediate relay ZJ and thermal relay FT, be connected with the normally opened contact 1SJ1-1 of the time relay at the two ends of intermediate relay ZJ, the normally-closed contact KMY1-2 of A.C. contactor, the coil of the normally-closed contact 2SJ1-2 of the time relay and A.C. contactor KM △, be connected with the normally opened contact KM △ 1-1 of A.C. contactor at the two ends of the normally opened contact 1SJ1-1 of the time relay, be connected with the normally-closed contact 1SJ1-2 of the time relay at the two ends of intermediate relay ZJ, the coil of A.C. contactor KMY, the normally-closed contact KM △ 1-2 of A.C. contactor, between the coil of the normally-closed contact 1SJ1-2 of the time relay and A.C. contactor KMY, be connected with the normally opened contact LJ1-1 of current relay LJ and the coil 1SJ of the time relay, be connected with the normally-closed contact LJ1-2 of current relay LJ at the two ends of intermediate relay ZJ, the normally opened contact ZJ2-1 of auxiliary relay and the coil 2SJ of the time relay, the normally opened contact ZJ1-1 of connect hours relay between the front end of the normally opened contact 1SJ1-1 of the front end of starting button SB2 and the time relay; Be connected with normally-closed contact ZJ1-2, indicator light YD and the normally opened contact KMY1-1 of A.C. contactor and the normally opened contact KM △ 2-1 of indicator light RD and A.C. contactor of the indicator light GD and the time relay at the two ends of stop button SB1, starting button SB2 and intermediate relay ZJ; Between motor triple line L1, L2, L3 and motor other three terminal U2, V2, W2, be connected with the main contacts of A.C. contactor KM △, between the main contacts of A.C. contactor KM △ and motor other three terminal U2, V2, W2, be connected with the main contacts of A.C. contactor KMY.

The circuit breaker Q of closing F, press starting control button SB2, the intermediate relay ZJ adhesive, it often opens the auxiliary contact closure, the ZJ1-1 self-sustaining, have L1 → FU1 → SB 1 → ZJ1-1 → 1SJ1-2 → KMY → KM △ 1-2 → KT0 → FU2 → L3 this moment in control loop, contactor KMY adhesive, and the starting of motor Y shape:

KMY1-2 disconnects contactor KM △ loop and locking.

Current relay LJ adhesive: normally-closed contact LJ1-2 relay opening time 2SJ loop.

Normally opened contact LJ1-1 closed turn-on time of relay 1SJ loop → 1SJ adhesive:

The 1SJ1-2 time-delay disconnects KMY loop → KMY release → auxiliary contact KMY1-2 closure.

1SJ1-1 timing closing → connection KM △ loop → KM △ adhesive:

KM △ 1-2 disconnects KMY loop and locking.

The closed self-sustaining of KM △ 1-1 → motor △ shape operation.

When the motor light running, the electric current of the current relay of flowing through reduces, and LJ discharges, and have this moment:

LJ1-2 relay turn-on time 2SJ loop → 2SJ adhesive → 2SJ1-2 disconnects KM △ loop → KM △ release → KM △ 1-2 closure.

LJ1-1 relay opening time 1SJ loop → 1SJ1-2 closure → connection KMY loop → motor Y shape operation.

When motor load increased, the electric current of the current relay of flowing through increased, the LJ adhesive, and motor is converted to the operation of △ shape again.

Y-△ control is adjusting of conversion boundary value automatically:

The Y-△ load current boundary value of conversion automatically is set at 50% of motor rated current, and the return current value when current relay LJ discharges is motor by the switching current setting value of △ to Y, and its calculating formula is:

Drop-off to pick-up ratio (return current/operating current) is got:

$K_{\mathrm{FH}}=\frac{I_{\mathrm{FH}}}{I_{\mathrm{DZ}}}\≥0.85$

I then _DZ≤ 1.17I _FHBe motor by the switching current setting value of Y to △.

For fear of when load instantaneous fluctuates, the frequent alternately conversion of Y-△ control and damage contactor, motor by △ when Y delays time transition, adjust the operate time of time relay 2SJ and should be longer than the operate time of 1SJ, can adjust about 50S.

Claims (1)

1. power-saving Y-delta starter of motor, comprise and be connected motor triple line L1, L2, three terminal U1 of L3 and motor, V1, circuit breaker Q F between the W1, thermal relay FT and be serially connected with current relay LJ ammeter indicating circuit, it is characterized in that: be connected with stop button SB1 by fuse FU1 and FU2 between mutually at the L1 of motor and L3, starting button SB2, the normally-closed contact of intermediate relay ZJ and thermal relay FT, be connected with the normally opened contact 1SJ1-1 of the time relay at the two ends of intermediate relay ZJ, the normally-closed contact KMY1-2 of A.C. contactor, the coil of the normally-closed contact 2SJ1-2 of the time relay and A.C. contactor KM △, be connected with the normally opened contact KM △ 1-1 of A.C. contactor at the two ends of the normally opened contact 1SJ1-1 of the time relay, be connected with the normally-closed contact 1SJ1-2 of the time relay at the two ends of intermediate relay ZJ, the coil of A.C. contactor KMY, the normally-closed contact KM △ 1-2 of A.C. contactor, between the coil of the normally-closed contact 1SJ1-2 of the time relay and A.C. contactor KMY, be connected with the normally opened contact LJ1-1 of current relay LJ and the coil 1SJ of the time relay, be connected with the normally-closed contact LJ1-2 of current relay LJ at the two ends of intermediate relay ZJ, the normally opened contact ZJ2-1 of auxiliary relay and the coil 2SJ of the time relay, the normally opened contact ZJ1-1 of connect hours relay between the front end of the normally opened contact 1SJ1-1 of the front end of starting button SB2 and the time relay; Be connected with normally-closed contact ZJ1-2, indicator light YD and the normally opened contact KMY1-1 of A.C. contactor and the normally opened contact KM △ 2-1 of indicator light RD and A.C. contactor of the indicator light GD and the time relay at the two ends of stop button SB1, starting button SB2 and intermediate relay ZJ; Between motor triple line L1, L2, L3 and motor other three terminal U2, V2, W2, be connected with the main contacts of A.C. contactor KM △, between the main contacts of A.C. contactor KM △ and motor other three terminal U2, V2, W2, be connected with the main contacts of A.C. contactor KMY.

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