CN108711830B - High-voltage motor protection device - Google Patents
High-voltage motor protection device Download PDFInfo
- Publication number
- CN108711830B CN108711830B CN201810499067.2A CN201810499067A CN108711830B CN 108711830 B CN108711830 B CN 108711830B CN 201810499067 A CN201810499067 A CN 201810499067A CN 108711830 B CN108711830 B CN 108711830B
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- voltage
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- breaker
- loop
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- 238000001816 cooling Methods 0.000 claims abstract description 22
- 230000001012 protector Effects 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements
- H02H7/0844—Fail safe control, e.g. by comparing control signal and controlled current, isolating motor on commutation error
Landscapes
- Control Of Ac Motors In General (AREA)
- Stopping Of Electric Motors (AREA)
Abstract
A high-voltage motor protector relates to a high-voltage motor protector, which comprises a main loop for providing power for a high-voltage motor, a high-voltage circuit breaker, a high-voltage motor cooling device loop, a control loop and a microcomputer relay protector, wherein a direct-current power supply under-voltage relay is added on the control loop, an alternating-current voltage loss relay is added in the motor cooling device loop, the safe operation of equipment is ensured, and serious consequences caused by accidents are avoided.
Description
Technical Field
The present invention relates to a high-voltage motor protection device.
Background
In a high-voltage power supply and distribution system, a high-voltage motor is controlled by switching on and switching off a main loop power supply of a high-voltage circuit breaker, and the high-voltage motor drives high-voltage equipment to realize the starting and stopping processes; and the switching on and off of the main circuit of the high-voltage circuit breaker depends on whether the switching-on circuit and the switching-off circuit of the circuit breaker are on or off.
The invention mainly aims at the process of realizing protection of a brake separating loop of a high-voltage equipment breaker with a cooling control device. For example, the main loop of the 10kV air compressor is 10kV, and the control loop of the cooling device is 0.4kV. The control loop of the high-voltage circuit breaker is provided by a direct-current control power supply 220V, and in normal operation, an operation signal of the main motor is connected with a relay coil in series, and a normally closed contact of the relay is connected in series into a brake separating loop of the main motor and is used for disconnecting the brake separating loop when the main motor operates. In the production process, direct current voltage is often reduced due to direct current power failure, so that a relay coil for disconnecting a brake-separating loop cannot be attracted, a normally closed contact of the relay is not disconnected and is always in a connection state, and a brake-separating coil of a circuit breaker cannot be separated due to too low direct current voltage, so that the brake-separating coil of the circuit breaker is electrified for a long time to burn out. I.e. the common phenomenon that the equipment cannot be stopped when the equipment is wanted to be stopped immediately. Thus causing serious equipment accidents, in particular to an air compressor, and if the main engine runs continuously due to oil shortage, the air compressor can explode or hurt people.
Disclosure of Invention
Aiming at the defects of the existing protection mode, the invention provides a high-voltage motor protection device, which ensures that a high-voltage circuit breaker is disconnected when a direct-current power supply fails or a cooling device is in voltage-losing shutdown, so that the device stops running immediately; when the voltage of the direct current power supply is reduced, the opening coil is not burnt out, the opening of the circuit breaker is not affected, the safe operation of the equipment is finally ensured, and serious consequences caused by accidents are avoided.
The aim of the invention is achieved by the following technical measures:
the high-voltage motor protection device comprises a main loop 100 for providing power for a high-voltage motor, a high-voltage breaker connected to the main loop 100 for controlling the start and stop of the high-voltage motor 102, a high-voltage motor cooling device loop 300, and a control loop 200 for controlling the opening of the high-voltage breaker, wherein the control loop 200 is connected with a microcomputer relay protector 202, the microcomputer relay protector 202 is connected with the high-voltage breaker for controlling the opening of the high-voltage breaker, the control loop 200 is a direct-current power supply, a direct-current power supply undervoltage relay is added to the control loop 200, an alternating-current voltage undervoltage relay is added to the motor cooling device loop 300, the alternating-current power supply of the motor cooling device is U, V, W three-phase alternating-current power supply, the alternating-current voltage undervoltage relay is divided into a UV (UV) phase alternating-current voltage step-down relay and a VW phase alternating-current voltage step-down relay, and a normally-closed contact 206 and a normally-closed contact 205 and a direct-current power supply undervoltage relay normally closed contact 204 and a high-voltage circuit breaker opening button 203 form a parallel loop; the parallel circuit, the microcomputer relay protector 202, the normally open contact 207 of the high-voltage circuit breaker, the switching-off coil 208 of the high-voltage circuit breaker, the direct-current power switch 201 and the direct-current power supply form a tripping switching-off circuit of the high-voltage circuit breaker.
More preferably: when the high-voltage breaker opening button 203 is closed by manual operation, the high-voltage breaker opening loop in the control loop 200 is closed, and when the high-voltage breaker opening coil 208 acts, the high-voltage breaker main contact 101 in the main loop 100 is opened, so that the high-voltage motor 102 stops working normally.
More preferably: when the UV phase or the VW phase in the cooling device loop 300 is powered off and loses voltage, the normally closed contact 206 of the corresponding UV phase alternating current voltage-losing relay or the normally closed contact 205 of the VW phase alternating current voltage-losing relay in the control loop 200 is closed, the high-voltage breaker switching-off loop in the control loop 200 is connected, when the high-voltage breaker switching-off coil 208 acts, the high-voltage breaker main contact 101 in the main loop 100 is opened, the high-voltage motor 102 stops working due to the voltage-losing fault of the cooling device, the direct current power supply voltage in the control loop 200 is reduced or fails, the direct current under-voltage relay coil 209 is powered off, the normally closed contact 204 of the direct current power supply under-voltage relay in the high-voltage breaker switching-off loop is closed, the high-voltage breaker switching-off loop in the control loop 200 is connected, and when the high-voltage breaker switching-off coil 208 acts, the high-voltage breaker main contact 101 in the main loop is opened, and the high-voltage motor 102 stops working due to the direct current power supply under-voltage or the fault.
More preferably: the direct current of the control loop 200 provides direct current power to the microcomputer relay protector 202 and the direct current voltage relay through the direct current power switch 201.
Beneficial technical effects
The invention has the following advantages:
firstly, a direct-current under-voltage relay and a cooling device voltage step-down relay are added in an original control loop, so that the investment cost is low, and the obtained benefit is considerable.
Secondly, the control loop circuit has simple working principle, and is convenient for general maintenance personnel to understand and accept easily.
Thirdly, after the protection device is put into use, the phenomenon that the device cannot be stopped in the production process is avoided, and the safety of equipment and personnel is greatly ensured.
Fourth, this protection can not stop the phenomenon of getting off equipment when equipment trouble when putting into service, guarantees the safe and reliable operation of equipment, improves the stability of production, reduces enterprise's manufacturing cost, increases enterprise's comprehensive economic efficiency.
Drawings
Fig. 1: the control diagram of the high-voltage motor protection device is shown in the specification;
in the figure: 100-main circuit, 101-high-voltage circuit breaker main contact, 102-high-voltage motor, 200-control circuit, 201-direct current power switch, 202-microcomputer relay protection device, 203-high-voltage circuit breaker opening button, 204-direct current power under-voltage relay normally-closed contact, 205-VW crossing current voltage-loss relay normally-closed contact, 206-UV crossing current voltage-loss relay normally-closed contact, 207-high-voltage circuit breaker normally-open contact, 208-high-voltage circuit breaker opening coil, 209-direct current under-voltage relay coil, 300-cooling device circuit, 301-UV crossing current voltage-loss relay coil, 302-VW crossing current voltage-loss relay coil.
Detailed Description
The invention will be further described with reference to the accompanying drawings and its practical application.
Example 1: as shown in fig. 1, a high-voltage motor protection device comprises a main circuit 100 for providing power for a high-voltage motor, a high-voltage breaker connected to the main circuit 100 for controlling the start and stop of the high-voltage motor 102, a high-voltage motor cooling device circuit 300, and a control circuit 200 for controlling the opening of the high-voltage breaker, wherein the control circuit 200 is connected with a microcomputer relay protector 202, the microcomputer relay protector 202 is connected with the high-voltage breaker for controlling the opening of the high-voltage breaker, the control circuit 200 is a direct-current power supply, a direct-current power supply under-voltage relay (comprising a direct-current under-voltage relay coil 209 and a direct-current power supply under-voltage relay normally-closed contact 204) is added to the control circuit 200, an alternating-current voltage-losing relay is added in a motor cooling device loop 300, alternating current of the motor cooling device is U, V, W three-phase alternating current, the alternating-current voltage-losing relay is divided into a UV (ultraviolet) alternating-current voltage-losing relay (comprising a normally-closed contact 206 of the UV alternating-current voltage-losing relay and a normally-closed contact 301 of the UV alternating-current voltage-losing relay) and a VW alternating-current voltage-losing relay (comprising a normally-closed contact 205 of the VW alternating-current voltage-losing relay and a normally-closed contact 302 of the VW alternating-current voltage-losing relay), and the normally-closed contact 206 of the UV alternating-current voltage-losing relay, the normally-closed contact 205 of the VW alternating-current voltage-losing relay, the normally-closed contact 204 of the direct-current power supply under-voltage relay and the high-voltage circuit breaker opening button 203 form a parallel loop; the parallel circuit, the microcomputer relay protector 202, the high-voltage breaker normally open contact 207, the high-voltage breaker opening coil 208, the direct-current power switch 201 and the direct-current power supply form a high-voltage breaker opening circuit; when the high-voltage breaker opening button 203 is closed by manual operation, the high-voltage breaker opening loop in the control loop 200 is closed, and when the high-voltage breaker opening coil 208 acts, the main contact 101 of the high-voltage breaker in the main loop 100 is opened, so that the high-voltage motor 102 stops working normally; when the UV phase or the VW phase in the cooling device loop 300 is powered off and loses voltage, the normally closed contact 206 of the corresponding UV phase alternating current voltage-losing relay or the normally closed contact 205 of the VW phase alternating current voltage-losing relay in the control loop 200 is closed, the high-voltage breaker switching-off loop in the control loop 200 is connected, when the high-voltage breaker switching-off coil 208 acts, the high-voltage breaker main contact 101 in the main loop 100 is opened, the high-voltage motor 102 stops working due to the voltage-losing fault of the cooling device, the direct current power supply voltage in the control loop 200 is reduced or fails, the direct current under-voltage relay coil 209 is powered off, the normally closed contact 204 of the direct current power supply under-voltage relay in the high-voltage breaker switching-off loop is closed, the high-voltage breaker switching-off loop in the control loop 200 is connected, and when the high-voltage breaker switching-off coil 208 acts, the high-voltage breaker main contact 101 in the main loop is opened, and the high-voltage motor 102 stops working due to the direct current power supply under-voltage or the fault.
Example 2: the direct current of the control loop 200 described in embodiment 1 provides direct current power to the microcomputer relay protector 202 and the direct current voltage relay through the direct current power switch 201; the remainder being identical.
Various modifications and equivalent changes may be made to the invention without departing from the scope of the invention, and therefore, the invention is not limited to the specific embodiments disclosed, but is intended to include all embodiments falling within the scope of the appended claims.
Claims (3)
1. The high-voltage motor protection device comprises a main loop (100) for providing power for a high-voltage motor, a high-voltage breaker is connected to the main loop (100) to control the starting and stopping of the high-voltage motor (102), the high-voltage motor protection device further comprises a high-voltage motor cooling device loop (300) and a control loop (200) for controlling the opening of the high-voltage breaker, the control loop (200) is connected with a microcomputer relay protector (202), the microcomputer relay protector (202) is connected with the high-voltage breaker to control the opening of the high-voltage breaker, and the control loop (200) is a direct-current power supply, and is characterized in that a direct-current power supply under-voltage relay is added to the control loop (200), an alternating-current voltage step-down relay is added to the motor cooling device loop (300), the motor cooling device alternating-current is U, V, W three-phase alternating current, the alternating-current step-down relay is divided into a UV alternating-current step-down relay and a VW alternating-current step-down relay, and a normally-closed contact (206), a normally-closed step-down relay (205) and a normally-closed button switch-closed switch (204) and a normally-closed switch-closed contact (203) are formed in parallel connection; the parallel circuit and the microcomputer relay protector (202), the high-voltage breaker normally open contact (207), the high-voltage breaker opening coil (208), the direct-current power switch (201) and the direct-current power supply form a high-voltage breaker opening circuit; when the high-voltage breaker opening button (203) is closed by manual operation, the high-voltage breaker opening loop in the control loop (200) is connected, and when the high-voltage breaker opening coil (208) acts, the high-voltage breaker main contact (101) in the main loop (100) is disconnected, so that the high-voltage motor (102) stops working normally.
2. The high-voltage motor protection device according to claim 1, wherein when the UV phase or VW phase in the cooling device circuit (300) is in a power failure state, the corresponding UV phase or VW phase in the control circuit (200) is closed, the corresponding UV phase or VW phase is in a power failure state, the normally closed contact (206) of the dc phase or VW phase is closed, the normally closed contact (205) of the high-voltage circuit breaker in the control circuit (200) is closed, the high-voltage circuit breaker main contact (101) in the main circuit (100) is opened when the high-voltage circuit breaker opening coil (208) acts, the high-voltage motor (102) stops working due to the cooling device voltage failure, the dc power voltage in the control circuit (200) is reduced or fails, the dc power voltage relay coil (209) is in a power failure state, the normally closed contact (204) of the dc power voltage relay in the high-voltage circuit breaker opening circuit is closed, the high-voltage circuit breaker opening circuit in the control circuit (200) is closed, and the high-voltage circuit breaker main contact (101) in the main circuit is opened when the high-voltage circuit breaker opening coil (208) acts.
3. A high voltage motor protection device according to any one of claims 1 or 2, characterized in that the direct current of the control circuit (200) provides direct current power to the microcomputer relay protector (202) and the direct current voltage relay via a direct current power switch (201).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810499067.2A CN108711830B (en) | 2018-05-23 | 2018-05-23 | High-voltage motor protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810499067.2A CN108711830B (en) | 2018-05-23 | 2018-05-23 | High-voltage motor protection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108711830A CN108711830A (en) | 2018-10-26 |
| CN108711830B true CN108711830B (en) | 2023-12-29 |
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ID=63869256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810499067.2A Active CN108711830B (en) | 2018-05-23 | 2018-05-23 | High-voltage motor protection device |
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| Country | Link |
|---|---|
| CN (1) | CN108711830B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203039349U (en) * | 2013-01-10 | 2013-07-03 | 浙江华健电子科技有限公司 | Motor protector realized by and based on RN8302 |
| WO2015158218A1 (en) * | 2014-04-18 | 2015-10-22 | 深圳市倍通控制技术有限公司 | Motor restarting controller |
| CN206727642U (en) * | 2017-03-16 | 2017-12-08 | 南京讯汇科技发展有限公司 | A kind of phase shortage automatic power-off protection device |
| CN208257392U (en) * | 2018-05-23 | 2018-12-18 | 云南华联锌铟股份有限公司 | A kind of HV motor protection device |
-
2018
- 2018-05-23 CN CN201810499067.2A patent/CN108711830B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203039349U (en) * | 2013-01-10 | 2013-07-03 | 浙江华健电子科技有限公司 | Motor protector realized by and based on RN8302 |
| WO2015158218A1 (en) * | 2014-04-18 | 2015-10-22 | 深圳市倍通控制技术有限公司 | Motor restarting controller |
| CN206727642U (en) * | 2017-03-16 | 2017-12-08 | 南京讯汇科技发展有限公司 | A kind of phase shortage automatic power-off protection device |
| CN208257392U (en) * | 2018-05-23 | 2018-12-18 | 云南华联锌铟股份有限公司 | A kind of HV motor protection device |
Non-Patent Citations (1)
| Title |
|---|
| 接触器在电机控制中的应用;王爱军;;科技风(24);全文 * |
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| Publication number | Publication date |
|---|---|
| CN108711830A (en) | 2018-10-26 |
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