CN214153988U - Circuit for realizing pre-shutdown before abnormal loss of main power supply of medium-voltage frequency converter - Google Patents
Circuit for realizing pre-shutdown before abnormal loss of main power supply of medium-voltage frequency converter Download PDFInfo
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- CN214153988U CN214153988U CN202022978818.4U CN202022978818U CN214153988U CN 214153988 U CN214153988 U CN 214153988U CN 202022978818 U CN202022978818 U CN 202022978818U CN 214153988 U CN214153988 U CN 214153988U
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- separating brake
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Abstract
The utility model provides a circuit for realizing pre-shutdown before abnormal loss of a main power supply of a medium-voltage frequency converter, which comprises a brake-separating control loop, a first pre-separating brake relay KA1 and a second pre-separating brake relay KA 2; one end of the first pre-separating brake relay KA1, one end of the second pre-separating brake relay KA2 and one end of the tripping electromagnet Y2 are connected with the negative pole L-of the direct-current control power supply; the other end of the first pre-separating brake relay KA1 and the other end of the second pre-separating brake relay KA2 pass through KA1 normally open contacts 21-22, and the other end of the tripping electromagnet Y2 passes through KA2 normally open contacts 11-12 and then is simultaneously connected with the other end of TBJ. Through improving the separating brake control circuit of the medium voltage frequency converter 6kV power switch, two pre-separating brake relays are added, the medium voltage frequency converter can be shut down safely in priority before the main power switch is disconnected by utilizing the inherent action time delay of the relays, and the risk of damaging the frequency converter and load equipment is avoided.
Description
Technical Field
The utility model relates to a circuit structure especially relates to a circuit that realizes that medium voltage inverter owner power supply loses the preceding shut down in advance unusually.
Background
The frequency converter is a power control device which applies frequency conversion technology and microelectronic technology and controls an alternating current motor by changing the frequency mode of a working power supply of the motor, mainly comprises a rectifying unit, a filtering unit, an inverting unit, a braking unit, a driving unit, a detection unit and a microprocessing unit and the like, and adjusts the voltage and the frequency of an output power supply by controlling the on-off of a transistor in the frequency converter according to the actual needs of the motor so as to achieve the purposes of speed regulation and energy conservation. With the continuous improvement of the industrial automation degree, the frequency converter is also widely applied.
The main helium fan of the high-temperature gas cooled reactor demonstration project adopts a PowerFlex 7000L 'C' frame liquid cooling medium-voltage frequency converter of Roxwell, a factory 6kV bus provides a power supply for the frequency converter, and the frequency converter supplies power to a motor. The frequency converter consists of a voltage control and medium voltage inlet and outlet line connection cabinet, a rectification inverter, a medium voltage capacitor, a direct current reactor, a liquid cooling loop and other equipment. When the system is normally started, a factory-used 6kV power switch is used as an input power supply, and then the frequency converter is started according to a logic sequence to drive the load motor to rotate; when the frequency converter is normally stopped, the frequency converter is normally stopped to enable the frequency converter to be stopped to safely stop the load motor and the frequency converter, and then an upstream 6kV power switch is disconnected to cut off a power supply.
The vast majority of medium voltage frequency converters do not allow direct disconnection converter power supply to come the parking of shutting down, give the converter outage in the high-speed rotation of motor, the converter will unable braking, the motor will freely park, especially can damage equipment under the condition that has the requirement to the parking time, also have certain influence to the inside hardware of converter simultaneously, burn the inside precision equipment of converter easily, and the service life is shortened, take place too much and damage the incident of converter and motor because direct disconnection medium voltage power supply.
The upstream 6kV power switch adopts a VD4 vacuum circuit breaker with a fully-mechanized protection device, so that on-site brake separation, DCS remote brake separation and protection brake separation when the fully-mechanized protection device detects a fault can be realized. When the frequency converter normally operates, due to manual misoperation, DCS signal false triggering and comprehensive protection action, a power supply is directly lost before the frequency converter is safely shut down, and the risk of damaging load equipment and the frequency converter exists.
SUMMERY OF THE UTILITY MODEL
The utility model aims at: the control method for realizing the pre-shutdown before the abnormal loss of the main power supply of the medium-voltage frequency converter is provided, and the risk that the frequency converter and load equipment are damaged due to the direct loss of the power supply in normal operation is avoided.
The technical scheme is as follows:
the utility model provides a circuit that realization medium voltage inverter owner power supply loses before unusually to shut down in advance, includes separating brake control circuit, separating brake control circuit includes: the tripping device comprises a tripping coil TBJ, a tripping coil TBJ normally-open auxiliary contact, a comprehensive protection tripping contact BTJ, a remote brake separating contact DCS, a local brake separating button SA and a tripping electromagnet Y2; it is characterized in that: one end of the local brake separating button SA, the remote brake separating contact DCS, the normally open contact of the trip coil TBJ and one end of the internal protection trip contact BTJ of the comprehensive protection device are connected with the positive electrode L + of the direct-current control power supply; the local brake separating button SA, the remote brake separating contact DCS, the normally open contact of the trip coil TBJ and the other end of the internal protection trip contact BTJ of the comprehensive protection device are connected and then connected with one end of the trip coil TBJ.
Preferably: the system also comprises a first pre-separating brake relay KA1 and a second pre-separating brake relay KA 2; one end of the first pre-separating brake relay KA1, one end of the second pre-separating brake relay KA2 and one end of the tripping electromagnet Y2 are connected with the negative pole L-of the direct-current control power supply; the other end of the first pre-separating brake relay KA1 and the other end of the second pre-separating brake relay KA2 pass through KA1 normally open contacts 21-22, and the other end of the tripping electromagnet Y2 passes through KA2 normally open contacts 11-12 and then is simultaneously connected with the other end of TBJ.
Preferably: the system also comprises KA1 normally open contacts 11-12, one end of each normally open contact is connected with the control power supply L, and the other end of each normally open contact is connected with the shutdown loop.
Preferably: when a local brake-separating button SA is touched by mistake, a remote brake-separating contact DCS mistakenly sends a brake-separating signal, or a comprehensive protection device detects that a fault internal protection trip contact BTJ acts to separate the brake and generates a 6kV power switch brake-separating signal, the first pre-brake-separating relay KA1 acts, a normally open contact 11-12 of the first pre-brake-separating relay is connected and sent to a downstream medium-voltage frequency converter shutdown loop, and the frequency converter starts to be shut down.
Preferably: and the normally open contacts 21-22 of the first pre-separating brake relay KA1 are connected, so that the second pre-separating brake relay KA2 acts, at the moment, the normally open contacts 11-12 of the second pre-separating brake relay KA2 are connected, the tripping electromagnet Y2 acts, and the delayed tripping of the 6kV power switch is completed.
Has the advantages that:
through improving the separating brake control circuit of the medium voltage frequency converter 6kV power switch, two pre-separating brake relays are added, the medium voltage frequency converter can be shut down safely in priority before the main power switch is disconnected by utilizing the inherent action time delay of the relays, and the risk of damaging the frequency converter and load equipment is avoided.
Drawings
Fig. 1 is the utility model discloses realize the circuit schematic diagram of shutting down in advance before the medium voltage inverter main power supply loses unusually.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.
The utility model provides a circuit that realization medium voltage inverter owner power supply loses before unusually to shut down in advance, includes separating brake control circuit, separating brake control circuit includes: the tripping device comprises a tripping coil TBJ, a tripping coil TBJ normally-open auxiliary contact, a comprehensive protection tripping contact BTJ, a remote brake separating contact DCS, a local brake separating button SA and a tripping electromagnet Y2; one end of the local brake separating button SA, the remote brake separating contact DCS, the normally open contact of the trip coil TBJ and one end of the internal protection trip contact BTJ of the comprehensive protection device are connected with the positive electrode L + of the direct-current control power supply; the local brake separating button SA, the remote brake separating contact DCS, the normally open contact of the trip coil TBJ and the other end of the internal protection trip contact BTJ of the comprehensive protection device are connected and then connected with one end of the trip coil TBJ; it is characterized in that: the system also comprises a first pre-separating brake relay KA1 and a second pre-separating brake relay KA 2; one end of the first pre-separating brake relay KA1, one end of the second pre-separating brake relay KA2 and one end of the tripping electromagnet Y2 are connected with the negative pole L-of the direct-current control power supply; the other end of the first pre-separating brake relay KA1 and the other end of the second pre-separating brake relay KA2 pass through KA1 normally open contacts 21-22, and the other end of the tripping electromagnet Y2 passes through KA2 normally open contacts 11-12 and then is simultaneously connected with the other end of TBJ. The system also comprises KA1 normally open contacts 11-12, one end of each normally open contact is connected with the control power supply L, and the other end of each normally open contact is connected with the shutdown loop.
The circuit working principle for realizing the pre-shutdown before the abnormal loss of the main power supply of the medium-voltage frequency converter is as follows:
increase two in original separating brake control circuit and divide brake relay KA1 and KA2 in advance and form the control circuit that divides brake in advance, it divides brake control circuit to establish ties in advance between tripping coil TBJ and tripping magnet Y2 in original separating brake control circuit simultaneously, when bumping on-the-spot separating brake button SA by mistake, the separating brake signal is sent out by mistake to distant place separating brake contact DCS, or when the comprehensive protection device detects that trouble internal protection tripping contact BTJ action divides brake and produces 6kV switch separating brake signal, first separating brake relay KA1 action, its auxiliary contact KA 1: 11-12, a shutdown loop of the downstream medium-voltage frequency converter is connected, so that the frequency converter starts to be shut down, and meanwhile, a first pre-separating brake relay KA1 assists a contact KA 1: 21-22, the second pre-separating brake relay KA2 is actuated, after the inherent actuation time delay of KA2, the frequency converter is stopped safely, and at the moment, the auxiliary contact KA2 of the second pre-separating brake relay KA 2: 11-12, the 6kV power switch tripping electromagnet Y2 is actuated to complete the delayed tripping of the 6kV power switch.
It is to be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principles of the present invention/utility model, but the present invention/utility model is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention/utility model, and these modifications and improvements are also considered to be within the scope of the invention/utility model.
Claims (3)
1. The utility model provides a circuit that realization medium voltage inverter owner power supply loses before unusually to shut down in advance, includes separating brake control circuit, separating brake control circuit includes: the tripping device comprises a tripping coil TBJ, a tripping coil TBJ normally-open auxiliary contact, a comprehensive protection tripping contact BTJ, a remote brake separating contact DCS, a local brake separating button SA and a tripping electromagnet Y2; it is characterized in that: one end of the local brake separating button SA, the remote brake separating contact DCS, the normally open contact of the trip coil TBJ and one end of the internal protection trip contact BTJ of the comprehensive protection device are connected with the positive electrode L + of the direct-current control power supply; the local brake separating button SA, the remote brake separating contact DCS, the normally open contact of the trip coil TBJ and the other end of the internal protection trip contact BTJ of the comprehensive protection device are connected and then connected with one end of the trip coil TBJ.
2. The circuit for realizing the pre-shutdown before the abnormal loss of the main power supply of the medium-voltage frequency converter as claimed in claim 1 is characterized in that: the system also comprises a first pre-separating brake relay KA1 and a second pre-separating brake relay KA 2; one end of the first pre-separating brake relay KA1, one end of the second pre-separating brake relay KA2 and one end of the tripping electromagnet Y2 are connected with the negative pole L-of the direct-current control power supply; the other end of the first pre-separating brake relay KA1 and the other end of the second pre-separating brake relay KA2 pass through KA1 normally open contacts 21-22, and the other end of the tripping electromagnet Y2 passes through KA2 normally open contacts 11-12 and then is simultaneously connected with the other end of TBJ.
3. The circuit for realizing the pre-shutdown before the abnormal loss of the main power supply of the medium-voltage frequency converter as claimed in claim 2, wherein: the system also comprises KA1 normally open contacts 11-12, one end of each normally open contact is connected with the control power supply L, and the other end of each normally open contact is connected with the shutdown loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022978818.4U CN214153988U (en) | 2020-12-08 | 2020-12-08 | Circuit for realizing pre-shutdown before abnormal loss of main power supply of medium-voltage frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022978818.4U CN214153988U (en) | 2020-12-08 | 2020-12-08 | Circuit for realizing pre-shutdown before abnormal loss of main power supply of medium-voltage frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214153988U true CN214153988U (en) | 2021-09-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022978818.4U Active CN214153988U (en) | 2020-12-08 | 2020-12-08 | Circuit for realizing pre-shutdown before abnormal loss of main power supply of medium-voltage frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214153988U (en) |
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2020
- 2020-12-08 CN CN202022978818.4U patent/CN214153988U/en active Active
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