CN202334404U

CN202334404U - Star type triangular starter of high-power motor

Info

Publication number: CN202334404U
Application number: CN2011204700353U
Authority: CN
Inventors: 谭秀权; 张�诚; 张新山
Original assignee: Yonggui Energy Development Co Ltd
Current assignee: Yonggui Energy Development Co Ltd
Priority date: 2011-11-23
Filing date: 2011-11-23
Publication date: 2012-07-11
Anticipated expiration: 2021-11-23

Abstract

The utility model discloses a star type triangular starter of a high-power motor, which comprises a main circuit and a control circuit. A power supply I of the main circuit is connected with a vacuum contactor I, the load side of the vacuum contactor I is connected with a comprehensive motor protector, the load side of the comprehensive motor protector is connected with the U1, V1 and W1 of the motor and the power side of a vacuum contactor II, the U2, V2 and W2 of the motor is connected with the power side of a vacuum contactor III and the load side of the vacuum contactor II, and three phases on the load side of the vacuum contactor III are short-circuited; and a power supply II of the control circuit is connected with a transformer, the transformer is connected with a fuse, the fuse is connected with an output point 3 and an output point 4 of the comprehensive motor protector, the output point 4 of the comprehensive motor protector is connected with one end of a normally closed point of a stop button, the other end of the normally closed point of the stop button is connected with a normally open point of a start button, the normally open point of the start button is connected with an auxiliary normally open point of the vacuum contactor I in parallel, the vacuum contactor II and the vacuum contactor III are respectively connected with an auxiliary point of the vacuum contactor II and an auxiliary point of the vacuum contactor III, the vacuum contactor III is connected with an open point of a delay relay, and the vacuum contactor II is connected with a closed point of the delay relay. The startup needs of the high-power motor can be satisfied, and the investment in equipment and the maintenance cost can be reduced effectively.

Description

Heavy-duty motor star triangle start device

Technical field

The utility model relates to a kind of starting drive, especially a kind of heavy-duty motor star triangle start device.

Background technology

At present, the electric motor starting mode can be divided into: total head directly starts, self coupling reduced-voltage starting, and soft start.1, the restriction that directly starts of total head is big, can't be used for the bigger electric motor starting of power, according to the rules; Should not adopt total head directly to start greater than the 10KW motor, and spoil disintegrating machine power supply take from the 400KVA transformer, when motor adopts total head directly to start; Power of motor must be not more than 30% of supply transformer capacity, otherwise, impact line voltage easily; Cause the line voltage loss excessive, spoil disintegrating machine motor single-machine capacity is 110KW, adopts assisted running; The motor gross power is 220KW, much larger than 30% of supply transformer capacity, therefore should not adopt total head directly to start.2, the self coupling reduced-voltage starting can satisfy heavy-duty motor reduced-voltage starting demand well, but needs to drop into self coupling reduced-voltage starting cabinet, and input cost is bigger, and necessary replacing of autotransformer damage in a single day, and maintenance cost is higher.3, soft start is to utilize silicon controlled phase-shift voltage regulating principle to realize that the pressure regulation of motor starts; Start effective but cost high, because of it uses thyristor, controllable silicon work time-harmonic wave disturbs bigger; Electrical network there is certain influence; The fluctuation of electrical network influences the conducting of thyristor easily in addition, so the failure rate of thyristor is higher, and maintenance difficulties is big.

Summary of the invention

The purpose of the utility model is: a kind of heavy-duty motor star triangle start device is provided, and its instinct satisfies the startup needs of heavy-duty motor, and effectively minimizing equipment drops into and maintenance cost again, to overcome the deficiency of prior art.

The utility model is achieved in that heavy-duty motor star triangle start device; Comprise major loop and control loop; The power supply I of major loop is connected with vacuum contactor I, and vacuum contactor I load side connects comprehensive protector of motor, and the load side of comprehensive protector of motor connects the mains side of U1, V1, W1 and the vacuum contactor II of motor; The U2 of motor, V2, W2 connect the mains side of vacuum contactor III and the load side of vacuum contactor II, the load side three-phase short circuit of vacuum contactor III; The power supply II of control loop connects transformer; Transformer connects fuse; Fuse connects the output point 3 and the output point 4 of comprehensive protector of motor, and the output point 4 of comprehensive protector of motor connects an end of the normally closed point of stop button, and the other end of the normally closed point of stop button connects the normal battle of start button; The normal battle of start button is parallelly connected with the auxiliary normal battle of vacuum contactor I; Vacuum contactor II, vacuum contactor III are connected with the auxiliary magnet of vacuum contactor III, the auxiliary magnet of vacuum contactor II respectively, and vacuum contactor III was connected with the battle of time-delay relay, and vacuum contactor II is connected with the close point of time-delay relay.

Owing to adopted technique scheme; Compared with prior art; The utility model adopts three vacuum contactors to form and star triangle start circuit is formed in the control corresponding loop; And adopting comprehensive protector of motor that motor is protected, the utility model utilizes the arc extinguishing advantage of vacuum contactor, has reduced because the danger that big electric current produces fiery arc; Prolonged the useful life of product, adopt three vacuum contactors to solve heavy-duty motor simultaneously because the big electric current that causes when starting, long time limit to the influence of electrical network and solved because big electric current, long time limit cause the problem of the fault of front end tranformer protection would trip.The utility model is simple in structure, and is easy to make, with low cost, and result of use is good.

Description of drawings

Accompanying drawing 1 is the structural representation of the utility model.

Embodiment

The embodiment of the utility model: heavy-duty motor star triangle start device; Comprise major loop and control loop; It is characterized in that: the power supply IFU1 of major loop is connected with vacuum contactor Ikm1; Vacuum contactor Ikm1 load side connects comprehensive protector of motor ZB; The load side of comprehensive protector of motor ZB connects the mains side of U1, V1, W1 and the vacuum contactor IIkm2 of motor M, and the U2 of motor M, V2, W2 connect the mains side of vacuum contactor IIIkm3 and the load side of vacuum contactor IIkm2, the load side three-phase short circuit of vacuum contactor IIIkm3; The power supply IIFU2 of control loop connects transformer KB; Transformer KB connects fuse TB; Fuse TB connects output point 3 and the output point 4 of comprehensive protector of motor ZB; The output point 4 of comprehensive protector of motor ZB connects an end of the normally closed point of stop button TB; The other end of the normally closed point of stop button TB connects the normal battle of start button QB, and the normal battle of start button QB is parallelly connected with the auxiliary normal battle of vacuum contactor Ikm1, and vacuum contactor IIkm2, vacuum contactor IIIkm3 are connected with the auxiliary magnet of vacuum contactor IIIkm3, the auxiliary magnet of vacuum contactor IIkm2 respectively; Vacuum contactor IIIkm3 was connected with the battle of time-delay relay KT, and vacuum contactor IIkm2 is connected with the close point of time-delay relay KT.

The operation principle of using is following: when motor M starts, press start button QB, the coil of vacuum contactor IKM1 gets electric, the closed formation of the normally opened contact of vacuum contactor IKM1 self-keeping circuit, vacuum contactor IKM1 adhesive.Simultaneously, the coil of vacuum contactor IIIKM3 gets electric, vacuum contactor IIIKM3 adhesive; At this moment, an end U1 of the stator winding of motor M, V1, W1 connect three phase mains, and other end U2, V2, W2 link together; The stator winding of motor M is Y-connection, and motor M is that star connection starts.After motor M became star connection to start, time-delay relay KT time-delay break contact broke off the coil losing electricity of vacuum contactor IIIKM3 through the time-delay back; Vacuum contactor IIIKM3 breaks off, and the normally-closed contact of vacuum contactor IIIKM3 is closed, simultaneously; Time-delay relay KT timing closing contact is closed through the time-delay back, and vacuum contactor KM2 coil gets electric, and KM2 normally opened contact closure forms the self-keeping circuit; Vacuum contactor IIKM2 adhesive, at this moment, an end U1 of the stator winding of motor M, V1, W1 connect three phase mains; The other end is through vacuum contactor IIKM2; Make the end to end formation of three phase windings closed-loop path, the stator winding of motor M is that triangle connects, and motor M is the full voltage operation.Vacuum contactor IIKM2 adhesive, its normally-closed contact breaks off, and energising causes coil to damage when avoiding time-delay relay KT long.The output point 3 of comprehensive protector of motor ZB and output point 4 are introduced control loop, and during faults such as motor M is short-circuited, overload, the phase failure, the output point 3 of comprehensive protector of motor ZB and output point 4 break off, The whole control loop dead electricity, and motor M is out of service.

Claims

1. heavy-duty motor star triangle start device; Comprise major loop and control loop; It is characterized in that: the power supply I (FU1) of major loop is connected with vacuum contactor I (km1); Vacuum contactor I (km1) load side connects comprehensive protector of motor (ZB); The load side of comprehensive protector of motor (ZB) connects the mains side of U1, V1, W1 and the vacuum contactor II (km2) of motor (M), and the U2 of motor (M), V2, W2 connect the mains side of vacuum contactor III (km3) and the load side of vacuum contactor II (km2), the load side three-phase short circuit of vacuum contactor III (km3); The power supply II (FU2) of control loop connects transformer (KB); Transformer (KB) connects fuse (TB); Fuse (TB) connects the output point 3 and the output point 4 of comprehensive protector of motor (ZB); The output point 4 of comprehensive protector of motor (ZB) connects an end of the normally closed point of stop button (TB); The other end of the normally closed point of stop button (TB) connects the normal battle of start button (QB); The normal battle of start button (QB) is parallelly connected with the auxiliary normal battle of vacuum contactor I (km1); Vacuum contactor II (km2), vacuum contactor III (km3) are connected with the auxiliary magnet of vacuum contactor III (km3), the auxiliary magnet of vacuum contactor II (km2) respectively, and vacuum contactor III (km3) was connected with the battle of time-delay relay (KT), and vacuum contactor II (km2) is connected with the close point of time-delay relay (KT).