CN2048262U

CN2048262U - Stater of auto-decompress with all-source protected open-phase

Info

Publication number: CN2048262U
Application number: CN 89205116
Authority: CN
Inventors: 董云甫; 高峰
Original assignee: HUADONG POLYTECHNICAL COLLEGE
Current assignee: HUADONG POLYTECHNICAL COLLEGE
Priority date: 1989-05-26
Filing date: 1989-05-26
Publication date: 1989-11-22

Abstract

The utility model belongs to an auto-transformer voltage reduction starter, in particular to an auto-transformer voltage reduction starter with full power open-phase protection. The utility model is composed of all parts of the XJ01 type auto-transformer voltage reduction starter which matches with 28-75KW electric motor and a fuse RD3 which are connected according to the attached figure. The utility model achieves the full power open-phrase protection of the motor by the auto-transformer compensator starter under the foundation of reserving the functions of the existing auto-transformer voltage reduction starter, the utility model mode is practical and reliable, and the cost is basically not added. The utility model is suitable for the design and improvement of the auto-transformer voltage reduction starter which matches with the 28-75KW electric motor.

Description

Stater of auto-decompress with all-source protected open-phase

The utility model relates to a kind of auto-transformer starter that is used for large and medium-sized motor, particularly a kind of full power supply open phase protection auto-transformer starter.

Existing auto-transformer starter of joining the low-voltage alternating-current asynchronous motor of 14～20KW, with homemade XJ01 type auto-transformer starter is example, the element coil of its secondary control circuit all connects A, the C phase of three phase mains (380V), when the B phase dead electricity in the three phase mains, but control circuit starting motor or keep motor and continue operation still.Because motor is in single-phase starting (or operation) state at this moment, must cause operating current to increase, the lighter makes electric motor overheating damage insulation, and weight person can make motor burn.In order to address this problem, the someone has proposed motor protector, as " the motor overcurrent protective device " of Chinese patent CN87215945U proposition and " the threephase motor phase shortage and the Voltage unbalance protector " of Chinese patent CN87217095U proposition etc.Motor protector is set; though the protection problem in the time of can solving motor phase shortage or overcurrent preferably; but the functional reliability of protector itself will be lower than the functional reliability of motor usually; and the protector cost that is used for large and medium-sized motor is very high; economy is relatively poor, and maintenance and maintenance are also inconvenient.In like manner, if adopt devices such as " automatic air-break switches " to solve the protection of motor, also there is above-mentioned shortcoming.How effectively and economically to overcome the shortcoming that prior art exists, become scientific research task that need to be resolved hurrily, that difficulty is higher in current large and medium-sized motor power phase shortage or the current protection technology field.

The purpose of this utility model is to provide a kind of full power supply open phase protection auto-transformer starter of joining 14～20KW motor for the shortcoming that overcomes prior art.It not only has the defencive function that prevents to cause because of the power supply phase failure motor overcurrent, and enforcement is very easy, and cost does not increase substantially, and is practical reliable.The utility model both had been suitable for auto-transformer starter manufactory to be implemented, and is suitable for the transformation of existing user to the auto-transformer starter of joining 14～20KW motor again.

The full power supply open phase protection auto-transformer starter of joining 14～20KW motor according to the utility model making, it mainly comprises A.C. contactor QC and XLC, time relay sj, intermediate relay ZJ, thermal relay RJ, control transformer JYB, autotransformer ZOB, indicator light HD, UD and LD, button QA and TA, fuse RD1 and RD2, SJ, XLC, one end of QC and ZJ coil is connected power supply C phase through fuse RD1, the other end that it is characterized in that SJ and XLC coil is connected power supply B phase through fuse RD3, and the other end of QC and ZJ coil is connected power supply A phase through fuse RD2; Time relay sj is provided with instantaneous normally opened contact SJ-3, and SJ-3 seals in the QC wire loop, and the normally opened contact QC-3 of QC seals in the SJ wire loop, constitutes electrical interlocks; The normally opened contact XLC-3 of XLC seals in the ZJ wire loop, and the normally opened contact ZJ-1 of ZJ seals in the XLC wire loop and constitutes electrical interlocks; The timing closing normally opened contact SJ-1 of SJ and ZJ-1 parallel connection, the time-delay of SJ disconnect normally-closed contact SJ-2 and seal in the QC wire loop, and the two ends of the normally-closed contact ZJ-2 of ZJ are link node 25 and 26 respectively.When any phase power cut-off of motor, the utility model not only makes the A.C. contactor or the auxiliary relay decompression that are connected this phase discharge, and can make the also decompression release immediately of the time relay chain or A.C. contactor with it, make thus motor lose whole power supplys can't start or start the back and operating motor shut down, thereby avoided the infringement of the power supply phase failure to motor.

The utility model compared with prior art, its distinguishing feature is: (1) realizes the full power supply open phase protection of auto-transformer starter to motor on the basis that keeps existing auto-transformer starter function; (2) enforcement is very easy, and cost does not increase (only increase a fuse and change the time relay with instantaneous normally opened contact, expense almost can be ignored) substantially; (3) do not need other distribution motor protective device, practical and reliable.The utility model is applicable to the design and the improvement of the auto-transformer starter of joining 14～20KW motor.

Concrete structure of the present utility model and operation principle are provided by drawings and Examples.

Accompanying drawing is according to the full power supply open phase protection auto-transformer starter basic circuit diagram of joining 14～20KW motor that the utility model proposes.

Below in conjunction with accompanying drawing the utility model is described in further detail:

Concrete structure of the present utility model adds fuse RD3 by whole elements of the XJ01 type auto-transformer starter of joining 14～20KW motor of standard (wherein time relay sj changes the time relay with instantaneous normally opened contact) and connects to form according to accompanying drawing.Fuse RD3 is identical with the specification of fuse RD1 and RD2.Connection in the utility model accompanying drawing between the components and parts and node numbering are 1～32.

When power supply just often, hand button QA connects 28 and 29, the QC coil gets electric adhesive, normally opened contact QC-3 closure makes the SJ coil must establish the beginning time-delay by cable, the instantaneous normally opened contact SJ-3 closure of SJ is simultaneously kept QC coil electricity (this moment openhanded do not open not influence).The main contacts of QC connects 1 and 7,2 and 8 and 3 and 9, the 60%(of supply voltage or 80%) be added on the motor, motor promptly begins starting.Delay time behind the preset time, time-delay disconnects normally-closed contact SJ-2 and opens, the QC coil losing electricity, normally-closed contact QC-2 recovers normally off, timing closing normally opened contact SJ-1 and then SJ-2 action back is closed, keep not dead electricity of SJ coil on the one hand, the XLC coil is got, normally opened contact XLC-3 closure, the ZJ coil gets electric, normally opened contact ZJ-1 closure, the XLC coil repeats to obtain power supply from another loop, normally-closed contact ZJ-2 opens, SJ coil losing electricity (normally opened contact QC-3 has recovered normally open because of the QC coil losing electricity), and timing closing normally opened contact SJ-1 recovers normally open, but the XLC coil is got electricity condition not to be influenced, time-delay disconnects normally-closed contact SJ-2 and recovers normally off, and instantaneous normally opened contact SJ-3 recovers normally open, so QC can be not again.Motor loses power supply because of QC discharges, and continues rotation under effect of inertia, XLC adhesive immediately, and the main contacts of XLC connects 1 and 4,2 and 5 and 3 and 6, and the whole voltages of motor connecting power enter normal operating condition.When needing to shut down, hand button TA disconnects 17 and 18, the equal dead electricity of all coils, and XLC discharges, and it is out of service that motor loses power supply.

If before the motor starting, power supply is undesired: (1) power supply C phase time that break, and the QC coil must not be electric, can't start; (2) the disconnected B phase time of power supply, SJ coil must not electricity, and SJ-3 is not closed, and QC can only crawl, and motor can not normal starting.(3) the disconnected A phase time of power supply, the QC coil must not be electric, can't start.

If behind the motor starting, power supply is undesired: (1) power supply C phase time that breaks, and SJ and QC coil losing electricity, motor is promptly stopped transport; (2) the disconnected B phase time of power supply, the SJ coil losing electricity, SJ-3 recovers normally open, the QC coil losing electricity, motor is promptly stopped transport; (3) the disconnected A phase time of power supply, the QC coil losing electricity, motor is promptly stopped transport.

If motor is in service, power supply is undesired: (1) power supply C phase time that breaks, and XLC and ZJ coil losing electricity, motor is promptly stopped transport; (2) the disconnected B phase time of power supply, the XLC coil losing electricity, motor is promptly stopped transport; (3) the disconnected A phase time of power supply, the ZJ coil losing electricity, ZJ-1 recovers normally open, the XLC coil losing electricity, motor is promptly stopped transport.

The utility model has been obtained significant effect through validation trial.

Claims

1, a kind of full power supply open phase protection auto-transformer starter of joining the 14-20KW motor; it mainly comprises A.C. contactor QC and XLC, time relay sj, intermediate relay ZJ, thermal relay RJ, control transformer JYB, autotransformer ZOB, indicator light HD, UD and LD, button QA and TA, fuse RD1 and RD2; one end of SJ, XLC, QC and ZL coil is connected power supply C phase through fuse RD1, it is characterized in that:

(1) other end of SJ and XLC coil is connected power supply B phase through fuse RD3, and the other end of QC and ZJ coil is connected power supply A phase through fuse RD2;

(2) time relay sj is provided with instantaneous normally opened contact SJ-3, and SJ-3 seals in the QC wire loop, and the normally opened contact QC-3 of QC seals in the SJ wire loop, constitute electrical interlocks, the normally opened contact XLC-3 of XLC seals in the ZJ wire loop, and the normally opened contact ZJ-1 of ZJ seals in the XLC wire loop, constitutes electrical interlocks;

(3) the timing closing normally opened contact SJ-1 of SJ and ZJ-1 parallel connection, the time-delay of SJ disconnect normally-closed contact SJ-2 and seal in the QC wire loop, and the two ends of the normally-closed contact ZJ-2 of ZJ are link node 25 and 26 respectively.

2, auto-transformer starter according to claim 1 is characterized in that fuse RD3 is identical with the specification of fuse RD1 and RD2.