CN216774644U - Control loop for preventing SFC incoming line switch from being mistakenly closed - Google Patents
Control loop for preventing SFC incoming line switch from being mistakenly closed Download PDFInfo
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- CN216774644U CN216774644U CN202122924711.6U CN202122924711U CN216774644U CN 216774644 U CN216774644 U CN 216774644U CN 202122924711 U CN202122924711 U CN 202122924711U CN 216774644 U CN216774644 U CN 216774644U
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- auxiliary contact
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- disconnecting link
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Abstract
The utility model discloses a control loop for preventing an SFC inlet switch from being mistakenly closed, which comprises an SFC device, wherein the outer end of the SFC device is electrically connected with a protection pressing plate LP through a wire, the output end of the protection pressing plate LP is sequentially and serially connected with a coil Y, a contact HJ, a second auxiliary contact, a normally closed contact TQ and a first auxiliary contact through wires, the SFC device, the normally closed contact TQ, the second auxiliary contact, the contact HJ, the coil Y and the protection pressing plate LP are assembled into a closed loop, and a relay TQ and a neutral point disconnecting link auxiliary contact which are parallelly connected with the coil Y, the contact HJ and the normally closed contact TQ are assembled between the first auxiliary contact and the protection pressing plate LP; according to the control loop for preventing the SFC inlet switch from being mistakenly closed, when the generator runs, the neutral point disconnecting link is in a closing state and drives the auxiliary contact of the neutral point disconnecting link to be closed, and meanwhile, the relay TQ is driven by the circuit to be started, so that the closing loop of the SFC inlet switch is reliably disconnected, and the condition that the switch is mistakenly closed is avoided.
Description
Technical Field
The utility model relates to the technical field of SFC control switches, in particular to a control loop for preventing an SFC incoming line switch from being closed by mistake.
Background
When the existing gas turbine generator operates, the SFC inlet wire switch 8011 is mistakenly closed or the equipment is mistakenly operated, the related equipment of the SFC can be damaged, and the risk potential is high; and SFC inlet wire switch 8011 is totally closed electrical switch, is difficult to investigate at ordinary times.
Most SFC cables and switch cabinets in the existing power plants have the voltage class of 6kV, the outlet voltage of the generator is 16kV when the generator normally operates, and when the generator operates, if the SFC inlet wire switch 8011 is mistakenly closed, the related equipment of the SFC is electrified, and the risk of damage is caused due to insufficient insulation class.
Therefore, we propose a control loop to prevent SFC inlet switch mis-closing.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
Aiming at the defects of the prior art, the utility model provides a control loop for preventing the SFC inlet switch from being mistakenly closed, and solves the problem that the safety and the reliability of the unit are poor when the existing SFC inlet switch is mistakenly closed.
(II) technical scheme
In order to achieve the purpose, the utility model is realized by the following technical scheme: the utility model provides a prevent control circuit that SFC service entrance switch mistake closed, includes the SFC device, the outer end of SFC device has protection clamp plate LP through wire electric connection, the output of protection clamp plate LP has coil Y, contact HJ, second auxiliary contact, normally closed contact TQ and first auxiliary contact through the wire series connection in proper order, the SFC device, first auxiliary contact, normally closed contact TQ, second auxiliary contact, contact HJ, coil Y and protection clamp plate LP assemble into a closed circuit, and be equipped with between first auxiliary contact and the protection clamp plate LP with coil Y, contact HJ, second auxiliary contact and normally closed contact TQ parallel connection's relay TQ and neutral point switch auxiliary contact.
Preferably, a resistor connected in series with the relay TQ and the neutral point disconnecting link auxiliary contact is arranged between the relay TQ and the neutral point disconnecting link auxiliary contact through a lead.
Preferably, the SFC device is equipped with a generator neutral disconnecting link in communication with the neutral disconnecting link auxiliary contact.
(III) advantageous effects
The utility model provides a control loop for preventing an SFC incoming line switch from being mistakenly closed. The method has the following beneficial effects:
the control loop for preventing the SFC incoming line switch from being mistakenly closed has the advantages that when the generator is in a non-running state, the generator neutral point disconnecting link is in a disconnected state, at the moment, the SFC device is matched with the protection pressing plate LP, the coil Y, the contact HJ, the second auxiliary contact and the normally closed contact TQ to send out a closing instruction, when the generator is in a running state, the neutral point disconnecting link of the generator is in a closing state at the moment and drives the auxiliary contact of the neutral point disconnecting link to be closed, meanwhile, the relay TQ is driven to be started by the circuit (at the moment, the normally closed contact TQ is opened under the influence of the starting of the relay TQ), thereby the switch-on loop of the SFC inlet wire switch is reliably disconnected, the condition of switch error switch-on is avoided, the technology has high economical efficiency, safety and reliability, the expected target is realized in the debugging and subsequent operation processes, the risk caused by the error closing of the SFC inlet switch is greatly reduced, and the safety and the reliability of the unit in operation are ensured.
Drawings
The attached figure is a circuit schematic diagram of the utility model.
In the figure: 1. an SFC device; 2. a first auxiliary contact; 3. a protective pressure plate LP; 4. a coil Y; 5. a junction HJ; 6. a second auxiliary contact; 7. a normally closed contact TQ; 8. a neutral point disconnecting link auxiliary contact; 9. a resistance; 10. and a relay TQ.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to the drawings, an embodiment of the present invention provides a technical solution: a control loop for preventing an SFC incoming line switch from being mistakenly closed comprises an SFC device 1, wherein the outer end of the SFC device 1 is electrically connected with a protection pressing plate LP3 through a lead, the output end of the protection pressing plate LP3 is sequentially and serially connected with a coil Y4, a contact HJ5, a second auxiliary contact 6, a normally closed contact TQ7 and a first auxiliary contact 2 through leads, the SFC device 1, the first auxiliary contact 2, the normally closed contact TQ7, the second auxiliary contact 6, the contact HJ5, a coil Y4 and the protection pressing plate LP3 are assembled into a closed loop, and a relay TQ10 and a neutral point disconnecting link auxiliary contact 8 which are parallelly connected with the coil Y4, the contact HJ5, the second auxiliary contact 6 and the normally closed contact TQ7 are assembled between the first auxiliary contact 2 and the protection pressing plate LP 3;
in the embodiment, it should be added that, in the control circuit for preventing the SFC service entrance switch from being erroneously closed, when the generator is in a non-operating state, the generator neutral point disconnecting link is in an open state, at this time, the SFC device 1, in cooperation with the protection pressing plate LP3, the coil Y4, the contact HJ5, the second auxiliary contact 6 and the normally closed contact TQ7, sends a closing instruction, when the generator is in an operating state, the generator neutral point disconnecting link is in a closed state and drives the neutral point disconnecting link auxiliary contact 8 to be closed, and at the same time, the relay TQ10 is influenced by the start of the relay TQ10 when the circuit is driven to be started, and the normally closed contact TQ7 is opened, so that the SFC service entrance switch closing circuit is reliably opened, thereby avoiding the occurrence of the switch being erroneously closed, which is high in technical economy, safe and reliable, and achieves the expected target in the debugging and subsequent operating processes, and greatly reduces the risk caused by the SFC service entrance switch being erroneously closed, the safety and the reliability of the unit during operation are ensured.
In the present embodiment, it should be added that the resistor 9 connected in series with the relay TQ10 and the neutral point disconnecting link auxiliary contact 8 are assembled through a wire;
the resistor 9 is set to ensure that the current passing through the relay TQ10 does not exceed a rated value or a specified value required by actual operation, so as to ensure the normal operation of the relay TQ 10.
In the present embodiment, it should be added that the SFC device 1 is equipped with a generator neutral disconnecting link that communicates with the neutral disconnecting link auxiliary contact 8;
the generator neutral point knife switch can control the on-off of the closing control loop, and then when the gas turbine generator operates, the SFC inlet wire switch cannot be closed.
The working principle and the using process of the utility model are as follows: when the generator is not in the running state, the generator neutral point disconnecting link is in the disconnected state, at the moment, the SFC device 1 is matched with the protection pressing plate LP3, the coil Y4, the contact HJ5, the second auxiliary contact 6 and the normally closed contact TQ7 to send a closing instruction, when the generator is in the running state, the generator neutral point disconnecting link is in the closing state and drives the neutral point disconnecting link auxiliary contact 8 to be changed into the closed state from the disconnection state, meanwhile, the relay TQ10 is influenced by the starting of the relay TQ10 when the circuit is driven to be started, the normally closed contact TQ7 is automatically disconnected, therefore, the closing loop of the SFC incoming line switch is reliably disconnected, and the condition that the switch is mistakenly closed is avoided.
While there have been shown and described what are at present considered the fundamental principles and essential features of the utility model and its advantages, it will be apparent to those skilled in the art that the utility model is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (3)
1. The utility model provides a prevent control circuit that SFC service entrance switch mistake closed which characterized in that: comprises an SFC device (1), the outer end of the SFC device (1) is electrically connected with a protection pressing plate LP (3) through a lead, the output end of the protection pressing plate LP (3) is sequentially connected with a coil Y (4), a contact HJ (5), a second auxiliary contact (6), a normally closed contact TQ (7) and a first auxiliary contact (2) in series through a lead, the SFC device (1), the first auxiliary contact (2), the normally closed contact TQ (7), the second auxiliary contact (6), the contact HJ (5), the coil Y (4) and the protective pressing plate LP (3) are assembled into a closed loop, and a relay TQ (10) and a neutral point disconnecting link auxiliary contact (8) which are connected with the coil Y (4), the contact HJ (5), the second auxiliary contact (6) and the normally closed contact TQ (7) in parallel are assembled between the first auxiliary contact (2) and the protective pressing plate LP (3).
2. The control loop for preventing the SFC incoming line switch from being mistakenly closed as claimed in claim 1, wherein: and a resistor (9) connected with the relay TQ (10) in series is arranged between the relay TQ and the neutral point disconnecting link auxiliary contact (8) through a lead.
3. The control loop for preventing the SFC incoming line switch from being mistakenly closed as claimed in claim 1, wherein: and a generator neutral point disconnecting link communicated with the neutral point disconnecting link auxiliary contact (8) is assembled in the SFC device (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122924711.6U CN216774644U (en) | 2021-11-26 | 2021-11-26 | Control loop for preventing SFC incoming line switch from being mistakenly closed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122924711.6U CN216774644U (en) | 2021-11-26 | 2021-11-26 | Control loop for preventing SFC incoming line switch from being mistakenly closed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216774644U true CN216774644U (en) | 2022-06-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122924711.6U Active CN216774644U (en) | 2021-11-26 | 2021-11-26 | Control loop for preventing SFC incoming line switch from being mistakenly closed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216774644U (en) |
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2021
- 2021-11-26 CN CN202122924711.6U patent/CN216774644U/en active Active
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