CN113471934B - Inverse time-lag overcurrent protection device of switch cabinet direct current motor loop - Google Patents
Inverse time-lag overcurrent protection device of switch cabinet direct current motor loop Download PDFInfo
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- CN113471934B CN113471934B CN202110722785.3A CN202110722785A CN113471934B CN 113471934 B CN113471934 B CN 113471934B CN 202110722785 A CN202110722785 A CN 202110722785A CN 113471934 B CN113471934 B CN 113471934B
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- motor
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- inverse time
- loop
- time limit
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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
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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
- H02H7/085—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 against excessive load
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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
- H02H7/085—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 against excessive load
- H02H7/0854—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 against excessive load responsive to rate of change of current, couple or speed, e.g. anti-kickback protection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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- Protection Of Generators And Motors (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses an inverse time limit overcurrent protection device of a switch cabinet direct current motor loop, which is characterized in that an inverse time limit overcurrent relay is connected in series in the motor loop to monitor the current of the motor loop in real time, when the motor has overcurrent, overload and short circuit stalling, a signal is output through an action contact according to a set time limit and is used for cutting off the power supply loop of the motor, and meanwhile, the signal is sent to a background system for monitoring. The invention realizes the real-time protection of the motor, prevents the motor from being burnt out due to overcurrent stalling, reduces the faults and improves the reliability of the secondary control system. The anti-time-limit overcurrent relay can reliably act according to the preset time limit, send out signals and remove faults when overcurrent, overload and short circuit locked rotor faults occur in the circuit of the switch motor of the electrical equipment during operation, ensure the safe operation of main equipment and a power transmission and distribution system, and greatly improve the economic benefit.
Description
Technical Field
The invention relates to the technical field of electrical equipment, in particular to an inverse time-lag overcurrent protection device for a switch cabinet direct current motor loop.
Background
At present, in indoor metal-enclosed switchgear, overcurrent protection measures for operating direct-current motors of a breaker direct-current energy storage motor, a handcart advancing mechanism motor, an isolating switch, a grounding switch and a three-position switch mainly adopt fault contacts of a series miniature circuit breaker, and once a motor loop breaks down, the fault contacts act to realize an overload protection function. However, the miniature circuit breaker cannot quickly reflect the overcurrent condition of the motor and timely cut off the operating power supply of the motor according to the overcurrent condition, so that the motor is easily damaged due to overcurrent stalling, and the fault rate of an electrical control loop is increased.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an inverse time limit overcurrent protection device for a switch cabinet direct current motor loop aiming at the problems that the direct current energy storage motor, a handcart propelling mechanism motor, an isolating switch, a grounding switch and an operation direct current motor of a three-position switch in switch equipment have faults of overcurrent, overload, short circuit, locked rotor and the like due to continuous operation, the motor is damaged, the switch cannot normally operate, the normal power supply of the switch equipment is influenced and the like.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
an inverse time limit overcurrent protection device of a switch cabinet direct current motor loop is characterized in that: the method comprises the steps of connecting an inverse time limit overcurrent relay in series in a motor loop, monitoring the current of the motor loop in real time, outputting a signal through an action contact according to a set time limit when the motor is subjected to overcurrent, overload and short circuit stalling, cutting off a power supply loop of the motor, and sending the signal to a background system for monitoring.
In a preferred embodiment of the invention, the device further comprises a switch motor, an energy storage power switch, a motor control switch and a communication device, wherein the switch motor, an inverse time limit overcurrent relay, the energy storage power switch, the motor control switch and the communication device form a switch motor energy storage loop and an inverse time limit overcurrent signaling loop, the switch motor energy storage loop consists of an energy storage power switch, a switch motor, a motor control switch, an energy storage motor microswitch, a first group of action contacts of the inverse time limit overcurrent relay, a series branch circuit formed by connecting an input coil of the inverse time limit overcurrent relay in series and an auxiliary power supply of the inverse time limit overcurrent relay, the series branch circuit and the auxiliary power supply of the inverse time limit overcurrent relay are connected in parallel and then connected to the energy storage power switch, and the energy storage power switch is connected with the positive end and the negative end of DC 220V; the inverse time-limit over-current signaling loop consists of an energy storage switch fault contact, an inverse time-limit over-current relay second group action contact and a communication device, wherein the energy storage switch fault contact and the inverse time-limit over-current relay second group action contact are connected in parallel and then connected to two input ends of the communication device.
In a preferred embodiment of the invention, the inverse time limit overcurrent relay has a time limit t preset according to formula (1) s The second group of action contacts of the inverse time limit overcurrent relay sends signals to the communication device; meanwhile, the fault contact of the energy storage switch transmits a fault signal to a background system through the communication device:
c in the formula (1) is a time constant; i is R Current is input in real time; i is S Is the setting current.
In a preferred embodiment of the present invention, the time constant C generally ranges from 0.1 to 9.9, and is generally 1 by default.
The working principle of the invention is as follows: the invention monitors the current of the switching motor loop in real time by connecting an inverse time-limit overcurrent relay in series with the switching motor loop, and when the switching motor has overcurrent, overload and short circuit stalling, the signal is output through the action contact according to the set time limit, so as to cut off the power supply loop of the switching motor and send the signal to the background monitoring. The motor is protected in real time, the motor is prevented from being burnt out due to overcurrent stalling, faults are reduced, and the reliability of a secondary control system is improved.
The invention solves the problems that when the circuit of the switch motor of the electrical equipment has overcurrent, overload and short circuit locked rotor faults during operation, the inverse time limit overcurrent relay can reliably act according to the preset time limit, send out signals and remove the faults, ensures the safe operation of the main equipment and the power transmission and distribution system, and greatly improves the economic benefit.
Drawings
Fig. 1 is a schematic diagram of a switching motor energy storage circuit according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of an inverse-time-overflow signaling loop according to an embodiment of the present invention.
Detailed Description
The invention is further described below in conjunction with the appended drawings and detailed description.
The invention discloses an inverse time limit overcurrent protection device of a switch cabinet direct current motor loop, which is characterized in that: the method comprises the steps of connecting an inverse time limit overcurrent relay in series with a motor loop, monitoring the current of the motor loop in real time, outputting a signal through an action contact according to a set time limit when the motor is subjected to overcurrent, overload and short circuit stalling, cutting off a power supply loop of the motor, and sending the signal to a background system for monitoring.
The specific technical scheme is that a switch motor energy storage loop and an inverse time limit overcurrent signaling loop are formed by a switch motor 11, an inverse time limit overcurrent relay, an energy storage power switch 13, a motor control switch 14 and a communication device 15.
Referring to fig. 1, the switch motor energy storage loop is composed of an energy storage power switch 13, a switch motor 11, a motor control switch 14, two aviation plugs CZ 17, an energy storage motor microswitch Sl 16, a first group of action contacts 122 of an inverse time-limited overcurrent relay, a series branch circuit formed by connecting an input coil 12 of the inverse time-limited overcurrent relay in series, and an auxiliary power supply 121 of the inverse time-limited overcurrent relay, wherein the series branch circuit is connected with the auxiliary power supply 121 of the inverse time-limited overcurrent relay in parallel and then connected to the energy storage power switch 13, and the energy storage power switch 13 is connected with positive and negative ends + HM and HM of a DC 220V.
The energy storage power switch 13(1DK) is turned on, the inverse time limit overcurrent relay auxiliary power supply 121(KA) is electrified, the motor control switch 14(HK) is turned on, the energy storage loop is electrified, the switch motor 11(M) starts energy storage, and the inverse time limit overcurrent relay current input coil 12(KA) is put into operation. The inverse time limit overcurrent relay monitors the current of a loop of the switch motor 11 in real time, when the switch motor 11 has overcurrent, overload and short circuit stalling faults, the inverse time limit overcurrent relay (KA) reliably acts according to the preset time limit ts of the formula (1), and a fault removing signal is sent out through the first group of action contacts 122(KA) of the relay, so that the motor is prevented from being burnt out due to overcurrent stalling, the switch motor is protected in real time, and the reliability of a secondary loop is guaranteed.
C in the formula (1) is a time constant; i is R Current is input in real time; i is S Is the setting current. The time constant C usually ranges from 0.1 to 9.9, and usually has a default value of 1.
Referring to fig. 2, the inverse time-limited overcurrent signaling circuit is composed of a fault contact 131 of the energy storage switch, a second set of action contacts 123 of the inverse time-limited overcurrent relay and the communication device 15, wherein the fault contact 131 of the energy storage switch and the second set of action contacts 123 of the inverse time-limited overcurrent relay are connected in parallel and then connected to two input terminals of the communication device 15.
The inverse time limit overcurrent relay KA operates according to a time limit ts preset by equation (1), and sends a signal to the communication device 15 (intelligent communication screen) through the relay second set of operation contacts 122 (KA). Meanwhile, the fault contact 131(1DK) of the energy storage power switch transmits a fault signal to the background system through the communication device 15 (intelligent communication screen). And the safe operation of the main equipment and the power transmission and distribution system is guaranteed.
The inverse time-lag overcurrent relay is connected in series with the direct current motor circuit for operating the circuit breaker direct current energy storage motor, the handcart advancing mechanism motor, the isolating switch, the grounding switch and the three-station switch, so that the motor is protected in real time, the reliable operation of a power grid is ensured, and the social and economic benefits are improved.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims and their equivalents.
Claims (3)
1. An inverse time limit overcurrent protection device of a switch cabinet direct current motor loop is characterized in that: the method comprises the steps that an inverse time limit overcurrent relay is connected in series in a motor loop to monitor the current of the motor loop in real time, when the motor is subjected to overcurrent, overload and short circuit stalling, signals are output through an action contact according to set time limits and used for cutting off a power supply loop of the motor, and meanwhile, the signals are sent to a background system for monitoring;
the switch motor, the inverse time limit overcurrent relay, the energy storage power switch, the motor control switch and the communication device form a switch motor energy storage loop and an inverse time limit overcurrent transmitting loop, wherein the switch motor energy storage loop consists of the energy storage power switch, a switch motor, the motor control switch, an energy storage motor microswitch, a first group of action contacts of the inverse time limit overcurrent relay, a series branch circuit formed by connecting an input coil of the inverse time limit overcurrent relay in series and an auxiliary power supply of the inverse time limit overcurrent relay, the series branch circuit and the auxiliary power supply of the inverse time limit overcurrent relay are connected in parallel and then connected to the energy storage power switch, and the energy storage power switch is connected with the positive end and the negative end of the DC 220V; the inverse time-limit over-current signaling loop consists of an energy storage switch fault contact, an inverse time-limit over-current relay second group action contact and a communication device, wherein the energy storage switch fault contact and the inverse time-limit over-current relay second group action contact are connected in parallel and then connected to two input ends of the communication device.
2. An inverse time overcurrent protection arrangement for a switch cabinet dc motor circuit as set forth in claim 1, wherein: the inverse time limit overcurrent relay is preset with a time limit t according to the formula (1) s The second group of action contacts of the inverse time limit overcurrent relay sends signals to the communication device; meanwhile, the fault contact of the energy storage switch transmits a fault signal to a background system through the communication device:
c in the formula (1) is a time constant; i is n Current is input in real time; i is s Is the setting current.
3. An inverse time overcurrent protection arrangement for a switch cabinet dc motor circuit as set forth in claim 2, wherein: the value range of the time constant C is 0.1-9.9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110722785.3A CN113471934B (en) | 2021-06-28 | 2021-06-28 | Inverse time-lag overcurrent protection device of switch cabinet direct current motor loop |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110722785.3A CN113471934B (en) | 2021-06-28 | 2021-06-28 | Inverse time-lag overcurrent protection device of switch cabinet direct current motor loop |
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| Publication Number | Publication Date |
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| CN113471934A CN113471934A (en) | 2021-10-01 |
| CN113471934B true CN113471934B (en) | 2022-08-12 |
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| CN202110722785.3A Active CN113471934B (en) | 2021-06-28 | 2021-06-28 | Inverse time-lag overcurrent protection device of switch cabinet direct current motor loop |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103273852A (en) * | 2013-04-25 | 2013-09-04 | 华南农业大学 | Electric field carrier distribution type driving system and control method thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2378865Y (en) * | 1999-02-12 | 2000-05-17 | 中国科学院福建物质结构研究所二部 | Self-supplying power memory type protector for dynamo-electric motors |
| CN205429691U (en) * | 2016-01-12 | 2016-08-03 | 中国石油天然气股份有限公司 | Overcurrent protection system and use its electric power supply system |
| CN106849014B (en) * | 2017-03-23 | 2019-10-08 | 马鞍山思卡瑞自动化科技有限公司 | A kind of motor safety control circuit system |
| CN210016271U (en) * | 2019-03-01 | 2020-02-04 | 深圳信息职业技术学院 | Direct current motor protection circuit and direct current motor protection device |
| CN210183007U (en) * | 2019-06-05 | 2020-03-24 | 余姚市荣兴电机有限公司 | Overcurrent protection circuit of direct current motor |
| CN210806725U (en) * | 2019-08-22 | 2020-06-19 | 郑州飞机装备有限责任公司 | Overcurrent protection circuit of direct current motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103273852A (en) * | 2013-04-25 | 2013-09-04 | 华南农业大学 | Electric field carrier distribution type driving system and control method thereof |
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