CN219780018U

CN219780018U - Automatic control device of generator electric jigger

Info

Publication number: CN219780018U
Application number: CN202320484450.7U
Authority: CN
Inventors: 罗建厅
Original assignee: China Yangtze Power Co Ltd
Current assignee: China Yangtze Power Co Ltd
Priority date: 2023-03-14
Filing date: 2023-03-14
Publication date: 2023-09-29
Anticipated expiration: 2033-03-14

Abstract

The automatic control device of the generator motor jigger comprises a fuse FU, a control switch K, time relays KT 1-KT 3, an intermediate relay KT and contactors KM 1-KM 3. The three phases of the generator stator A, B, C are controlled to be sequentially switched on and switched off by adjusting the parameters of the power-on delay time relay, and the cycle is continuously carried out. The control method is visual, accurate in control, low in cost, simple in operation and convenient in maintenance, the rotating part of the generator set is ensured to rotate smoothly when the generator set is used for electric jigger, and the accuracy of measured data is greatly improved.

Description

Automatic control device of generator electric jigger

Technical Field

The utility model relates to the technical field of maintenance of hydroelectric generating sets, in particular to an automatic control device for a generator motor jigger.

Background

When the hydroelectric generating set is overhauled, the rotating part of the set is required to be slowly rotated by an electric jigger, and the central position data of a shafting of the set is measured. The electric jigger is characterized in that after the stator and the rotor of the generator are respectively electrified with direct current, the rotating part of the unit is slowly rotated by utilizing the cross acting force of the magnetic fields of the stator and the rotor. If the unit rotating part rotates faster and slower, jitter will be generated, and the accuracy of the measured data will be affected. The rotor current is generally provided by a standby excitation system of the power plant, the stator current is generally provided by a silicon controlled rectifier device, but the stator current is required to be circularly switched on and off according to A, B, C three phases in sequence, and the rotor can rotate along a fixed direction.

At present, the existing electric jigger device of the hydropower station adopts manual control or automatic control according to stator current change: (one): the main disadvantage of manual control is that the rotation speed of the unit rotating part is greatly changed due to the difference of personal operation levels, the accuracy of measured data is seriously affected, and time and labor are wasted. As shown in figure 1, a manual control circuit of an electric jigger of a hydraulic generator of a certain hydropower station sequentially presses K manually _a 、K _b 、K _c The three button switches enable the contactors K1, K2 and K3 to be closed in sequence, and direct current is supplied to windings of each phase of the generator stator. In the electric jigger process, an operator needs to cyclically press K _a 、K _b 、K _c The control button can not be loosened after being pressed, and meanwhile, the rotating state of the rotor is carefully observed, so that the physical strength and the energy of staff are extremely tested. It can be seen that the manual control device has the following drawbacks:

1) When an operator observes the rotation state of the rotor, the phase change is determined by personal experience, which easily causes the rotor to rotate faster and slower and even reverse.

2) The manual control can cause phase change to occur too early or too late, and the period of one circle of jiggering can be increased, so that the heating of the magnetic poles of the rotor is increased.

3) In addition, the manual control can also be in the condition of two identical closing states, so that the output current of the jigger device is greatly changed, and the jigger device is easy to trip or damage.

Disclosure of Invention

In order to solve the technical problems, the utility model provides the automatic control device for the electric jigger of the generator, which is started and stopped by a control switch, and is simple and rapid to operate; the stator current can be circularly switched on and off according to A, B, C three phases in sequence in the running process of the electric jigger, so that the stress is uniform and the rotating speed is uniform in the whole running process of the electric jigger; and the method is not influenced by personal factors, and the accuracy of the measured data is greatly improved.

The technical scheme adopted by the utility model is as follows:

an automatic control device for a generator motor jigger, the control device comprising:

control switch K, time relay KT 1-KT 3, intermediate relay KT, contactor KM 1-KM 3;

the live wire L is connected with one end of a control switch K, the other end of the control switch K is connected with one end of a normally-closed contact of an intermediate relay KT, the other end of the normally-closed contact of the intermediate relay KT is respectively connected with one end of a time relay KT1 and one end of a contactor KM1, the other end of the contactor KM1 is connected with one end of a time relay KT1 delay disconnection contact, and the other ends of the time relay KT1 delay disconnection contact are connected with a zero line N;

the other end of the control switch K is respectively connected with one end of a time relay KT2 and one end of a time relay KT2 delay disconnection contact, the other end of the time relay KT2 delay disconnection contact is connected with one end of a contactor KM2, the other end of the time relay KT2 and the other end of the contactor KM2 are both connected with one end of a time relay KT1 delay closing contact, and the other end of the time relay KT1 delay closing contact is connected with a zero line N;

the other end of the control switch K is connected with one end of a time relay KT2 delay closing contact, the other end of the time relay KT2 delay closing contact is respectively connected with one end of a time relay KT3 delay closing contact, one end of a time relay KT3 delay opening contact and one end of a time relay KT3, the other end of the time relay KT3 delay closing contact is connected with one end of an intermediate relay KT, the other end of the time relay KT3 delay opening contact is connected with one end of a contactor KM3, and the other ends of the intermediate relay KT, the contactor KM3 and the time relay KT3 are all connected with a zero line N;

the live wire L is connected with one end of the control switch K through the fuse FU;

the contactor KM1, the contactor KM2 and the contactor KM3 are respectively connected with a stator A phase, a stator B phase and a stator C phase electric branch.

The utility model relates to an automatic control device for a generator motor jigger, which has the following technical effects:

1) The utility model uses the fuse, the control switch, the intermediate relay, the electrifying delay time relay, the contactor and other elements to form an automatic control device, which can control the on-off according to the set electrifying time sequence and can automatically circulate.

2) According to the utility model, three phases of the generator stator A, B, C are controlled to be sequentially on-off and circulated continuously by adjusting the parameters of the power-on delay time relay. The control device can be quickly adjusted according to the respective power-on time of three phases of the generator stator A, B, C in the electric jigger, and automatically circulates until the control switch is pressed down.

3) The control method is visual, accurate in control, low in cost, simple in operation and convenient in maintenance, the rotating part of the generator set is ensured to rotate smoothly when the generator set is used for electric jigger, and the accuracy of measured data is greatly improved.

4) The control device is widely applied, and can be applied to the condition that a plurality of loads need to be controlled sequentially and circulated continuously by simply increasing and decreasing the quantity of the power-on delay time relays.

Drawings

The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:

fig. 1 is a circuit diagram of an electric jigger manual control.

Fig. 2 is a circuit diagram of the automatic control device of the electric jigger of the present utility model.

Fig. 3 is a phase change diagram of the electric jigger.

Fig. 4 is a wiring diagram of a hydro-generator motor jigger.

Detailed Description

Principle analysis:

because the stator and the rotor of the hydraulic generator are respectively electrified with direct current, a constant magnetic field is generated, and the rotor can rotate against the friction force under the principle of homopolar repulsion and heteropolar repulsion. In the process of rotor rotation, the electromagnetic force acting on the stator winding is changed, the reaction force applied to the rotor magnetic poles is changed correspondingly, and when the reaction force is insufficient to overcome the friction force, the rotor rotation speed is reduced, and the stator winding needs to be continuously rotated by another communicated direct current, as shown in fig. 3.

The wiring of the electric jigger of the hydraulic generator of a certain hydropower station is shown in fig. 4, the power supply of the electric jigger device is taken from a 400V machine side power disc of the unit, is reduced in voltage by a voltage regulating transformer TB, is rectified by components such as a rectifying transformer ZLB, a silicon controlled rectifier cabinet, a freewheeling diode and the like, and provides direct current for each phase of windings of a stator of the generator by switching on and off of a contactor.

Theoretically, the time required for commutation of the stator windings is the same with constant current and coefficient of friction. The time interval of commutation can be set to delay through a time relay, and the stator winding is circularly electrified by controlling the on-off of a contactor coil, so that the automatic control of the jigger device is realized.

As shown in fig. 2, the main circuit diagram of the automatic control device of the electric jigger of the generator can respectively adjust the parameters of the power-on delay time relay according to actual needs, and ensures that the rotating process of the rotor is relatively stable.

The control device includes: fuse FU, control switch K, time relay KT1~ KT3, intermediate relay KT, contactor KM1~ KM3.

The live wire L is connected with one end of a control switch K through a fuse FU, the other end of the control switch K is connected with one end of a normally closed contact of an intermediate relay KT, the other end of the normally closed contact of the intermediate relay KT is respectively connected with one end of a time relay KT1 and one end of a contactor KM1, the other end of the contactor KM1 is connected with one end of a time relay KT1 delay disconnection contact, and the other ends of the time relay KT1 delay disconnection contact and the zero line N are connected;

the control switch K other end is connected with one end of a time relay KT2 delay closed contact, the other end of the time relay KT2 delay closed contact is respectively connected with one end of a time relay KT3 delay closed contact, one end of a time relay KT3 delay open contact and one end of a time relay KT3, the other end of the time relay KT3 delay closed contact is connected with one end of an intermediate relay KT, the other end of the time relay KT3 delay open contact is connected with one end of a contactor KM3, and the other end of the intermediate relay KT, the other end of the contactor KM3 and the other end of the time relay KT3 are all connected with a zero line N.

The main function of the design circuit is that after the stator A is electrified, the electrifying delay time relay KT1 works and delays to reach, the A phase is electrified while the B phase is electrified, the electrifying delay time relay KT2 works and delays to reach, the B phase is electrified while the C phase is electrified, the electrifying delay time relay KT3 works and delays to reach, the C phase is electrified while the A phase is electrified, and automatic circulation is realized. The automatic control method of the generator motor jigger comprises the following steps:

step1, a control switch K is pressed down, a normally closed contact of an intermediate relay KT is closed, a time relay KT1 is delayed to open the contact to be closed, a coil of the time relay KT1 is electrified to work, a contactor KM1 is simultaneously electrified, and a stator A is electrified;

step2, after the time delay is reached, the time relay KT1 delays to disconnect the contact, the coil of the contactor KM1 is powered off, and the stator A is powered off; meanwhile, the time relay KT1 delays closing of the contacts, the time relay KT2 delays opening of the contacts to close, the coil of the time relay KT2 is electrified to work, meanwhile, the contactor KM2 is switched on, and the phase B of the stator is electrified;

step3, after the delay is reached, the time relay KT2 delays to disconnect the contact, the coil of the contactor KM2 is powered off, and the phase B of the stator is powered off; meanwhile, the time relay KT2 is delayed to close the contact, the time relay KT3 is delayed to open the contact to close, the coil of the contactor KT3 is electrified to work, meanwhile, the contactor KM3 is switched on, and the stator C is electrified;

step4, after the time delay is reached, the time relay KT3 delays to disconnect the contact, the coil of the contactor KM3 is powered off, and the phase C of the stator is powered off; meanwhile, the time relay KT3 delays closing contact to be closed, a coil of the intermediate relay KT is electrified, and a normally closed contact of the intermediate relay KT is disconnected; the coil of the intermediate relay KT1 is powered off, and the delay closed contact of the intermediate relay KT1 is reset; the coil of the intermediate relay KT2 is powered off, and the delay closed contact of the intermediate relay KT2 is reset; the intermediate relay KT3 coil loses power, the KT2 delay closed contact is reset, the intermediate relay KT coil loses power, the normally closed contact is closed, the intermediate relay KT1 delay open contact is closed, the intermediate relay KT1 coil is electrified to work, meanwhile, the contactor KM1 is connected, and the stator A is electrified. The circulation work is started, the control switch K is pressed again, and the system is stopped.

Claims

1. The utility model provides a generator motor jigger automatic control device which characterized in that, this controlling means includes: control switch K, time relay KT 1-KT 3, intermediate relay KT, contactor KM 1-KM 3;

2. The automatic control device for an electric motor-driven jigger of claim 1, wherein: the live wire L is connected with one end of the control switch K through the fuse FU.