CN111463896A - Quick switching system and method for preventing voltage loss of service power manual switching bus - Google Patents
Quick switching system and method for preventing voltage loss of service power manual switching bus Download PDFInfo
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- CN111463896A CN111463896A CN202010391110.0A CN202010391110A CN111463896A CN 111463896 A CN111463896 A CN 111463896A CN 202010391110 A CN202010391110 A CN 202010391110A CN 111463896 A CN111463896 A CN 111463896A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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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
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- Engineering & Computer Science (AREA)
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Abstract
The invention provides a fast switching system and a method for preventing service power manual switching bus voltage loss, wherein the method is characterized in that switching value signals after working position contacts of a working power supply incoming line switch cabinet and a standby power supply incoming line switch cabinet are connected in series are transmitted to a DCS (distributed control system), on one hand, the switching value signals participate in manual switching starting logic remotely, a unit normally carries out remote manual switching for the DCS during starting, stopping and regular working switching of a service power supply, when a switch is not in a working position, a DCS manual switching instruction cannot be sent out due to unsatisfied conditions, normal switching cannot be carried out, hidden dangers existing in the switch position can be found in time, bus voltage loss accidents cannot be caused, on the other hand, the signals are used as alarm photon signs in the DCS, the alarm signs are displayed on a display screen to indicate operating personnel, and the reliability of equipment; a synchronous detection relay is added on a closing loop of a working power supply incoming line switch cabinet and a standby power supply incoming line switch cabinet, and when the fast switching logic unit is in fault exit, an independent synchronous detection loop can ensure the safety of manual parallel switching of service power.
Description
Technical Field
The invention belongs to the technical field of electrical equipment of thermal power plants, and particularly relates to a quick switching system and a quick switching method for preventing service power manual switching buses from losing voltage.
Background
The service power system of the thermal power plant generally has two power sources: namely a service working power supply and a standby (starting) power supply. At present, most of large-scale unit thermal power plants adopt unit wiring, the unit supplies power for the unit plant during normal operation, the standby power supply supplies power for the unit plant in a shutdown state, and the unit needs to be loaded to carry out the switching of the plant power during the starting and shutdown processes. In addition, when a unit or a factory working power supply breaks down, in order to ensure that the factory power supply is not interrupted and the unit is stopped safely and orderly without enlarging accidents, the factory power supply must be switched from the working power supply to a standby power supply as soon as possible, and the 6kV factory power supply of the large-scale thermal power plant is provided with a factory power supply quick switching device, is suitable for quick switching of the factory power supply, and has the function of mutually switching the main power supply and the standby power supply under normal conditions or one-way switching of the working power supply to the standby power supply under accidents and abnormal conditions.
In the prior art, the control loop design of a 6kV auxiliary power supply fast switching logic unit, a working power switch and a standby power switch of a thermal power plant is shown in fig. 1, and is a DCS fast switching manual switching instruction logic diagram shown in fig. 1.
Disclosure of Invention
The invention provides a fast switching system and a fast switching method for preventing service power manual switching buses from losing voltage, and aims to solve the technical problems recorded in the background technology.
The technical scheme of the invention is as follows: a fast switching system for preventing the service power manual switching bus from voltage loss comprises a working power supply incoming line switch cabinet, a standby power supply incoming line switch cabinet, a DCS cabinet, a fast switching logic unit and an abnormity warning unit, wherein a working power supply switch working position reserved contact is arranged on the working power supply incoming line switch cabinet, a standby power supply switch working position reserved contact is arranged on the standby power supply incoming line switch cabinet, the fast switching logic unit comprises a manual switching on-off end and an output end, the DCS cabinet comprises a display screen and an operating button, the operating button is arranged on the page of the display screen, the operating button comprises a manual switching operating button, the manual switching operating button is connected with the manual switching on-off end of the fast switching logic unit, the working power supply switch working position reserved contact and the standby power supply switch working position reserved contact are connected with the DCS cabinet through a wire in series connection as a working position contact, and the working position contact and the manual switching operation button form an AND gate output instruction which is an empty contact, the AND gate output instruction is sent to the manual switching input end of the fast switching logic unit, and the fast switching logic unit is started to be manually switched.
The scheme further comprises a synchronous detection relay, wherein the synchronous detection relay is connected in the wire inlet loop of the working power supply wire inlet switch cabinet and the standby power supply wire inlet switch cabinet.
Furthermore, the fast switching logic unit and the abnormal alarm unit are electrically connected with the display screen.
In another aspect of the present invention, a method for preventing voltage loss of a service power manual switching bus comprises:
1. the method comprises the steps that a working power supply incoming line switch cabinet and a standby power supply incoming line switch cabinet are provided with a working power supply switch working position reserved contact and a standby power supply switch working position reserved contact, a switching value signal S9-6100A formed by connecting the two contacts in series through a conducting wire is sent to a DCS cabinet, in DCS manual starting fast switching logic, an AND gate is formed by a manual switching operation button, an output instruction is that the empty contact is sent to a fast switching logic unit manual switching input end, and the fast switching logic unit is started to be manually switched;
2. meanwhile, a switch working position signal S9-6100A formed by connecting the working position reserved contact of the working power switch and the working position reserved contact of the standby power switch in series is displayed on a display screen to prompt operating personnel, and a fast switching logic unit in the DCS system controls and starts an abnormal alarm unit to do alarm signal indication of 'working and standby power switch working positions';
3. the switching-on loop of the working power supply incoming line switch cabinet and the standby power supply incoming line switch cabinet is additionally provided with a synchronous detection relay contact, the detection voltage of the synchronous detection relay is taken from the bus voltage and the incoming line power supply voltage, and when the fast switching logic unit is failed to exit, the independent synchronous detection loop can ensure the safety of the manual parallel switching of the service power.
The invention has the advantages that:
1. working positions of a working power supply incoming line switch and a standby power supply incoming line switch are sent to a DCS, on one hand, a remote place participates in manual switching starting logic, safety of service power switching is improved, on the other hand, the signal is used as an alarm photon board in a DCS picture, so that operating personnel can find hidden dangers in time, and reliability of equipment is improved;
2. the plant switching of the start and stop of the unit and the regular work is usually manually switched by a DCS, when a switch is not in a working position, a manual switching instruction of the DCS cannot be sent out due to the unsatisfied condition, the normal switching cannot be carried out, the hidden danger existing in the switch position can be found in time, and the occurrence of the voltage loss accident of the bus cannot be caused;
3. when the unit normally operates, the service power supply is switched through unit starting and regular work, the verified switch is at the correct position, the control mode logic of the quick switching logic unit is satisfied when a fault occurs, the standby power supply switch is closed without the contact locking of the working position, the loop is simplified, the risk factors are reduced, and the reliability of the loop is improved;
4. when the fast switching logic unit is quitted due to faults, the independent synchronous detection loop can ensure the safety of manual parallel switching of the auxiliary power.
Drawings
FIG. 1 is a logic diagram of a service DCS fast switch manual switching instruction in the prior art;
FIG. 2 is a logic diagram of a DCS fast switching manual switching instruction of the fast switching system for preventing the service manual switching bus from losing voltage according to the present invention;
FIG. 3 is a schematic diagram of a switch control loop of a fast switching system for preventing the loss of voltage of a service manual switching bus according to the present invention;
FIG. 4 is a wiring diagram of a synchronous relay of a fast switching system for preventing the loss of voltage of a service power manual switching bus according to the present invention;
FIG. 5 is a schematic connection diagram of a fast switching system for preventing loss of voltage of a service manual switching bus according to the present invention;
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which a person skilled in the art can, without any creative effort, fully implement the present invention.
The specific implementation mode of the invention is as follows: as shown in fig. 2-5, a fast switching system for preventing voltage loss of service power manual switching bus comprises a working power incoming line switch cabinet, a standby power incoming line switch cabinet, a DCS cabinet, a fast switching logic unit and an abnormality warning unit, wherein the working power incoming line switch cabinet is provided with a working power switch working position reserved contact, the standby power incoming line switch cabinet is provided with a standby power switch working position reserved contact, the fast switching logic unit comprises a manual switching on/off end and an output end, the DCS cabinet comprises a display screen and an operating button, the operating button is arranged on a display screen page, the operating button comprises a manual switching operating button, the manual switching operating button is connected with the manual switching on/off end of the fast switching logic unit, the working power switch working position reserved contact and the standby power switch working position reserved contact are connected with the DCS cabinet through a wire in series connection as a working position contact, and the working position contact and the manual switching operation button form an AND gate output instruction which is an empty contact, the AND gate output instruction is sent to the manual switching input end of the fast switching logic unit, and the fast switching logic unit is started to be manually switched.
The invention further comprises a synchronous detection relay 1, wherein the synchronous detection relay 1 is connected in the loops of the working power supply incoming line switch cabinet and the standby power supply incoming line switch cabinet.
Furthermore, the fast switching logic unit and the abnormal alarm unit are electrically connected with the display screen.
In another aspect of the present invention, a method for preventing voltage loss of a service power manual switching bus comprises:
1. the working position of a switch is reserved on a working power supply incoming line switch cabinet and a standby power supply incoming line switch cabinet, a working position reserved contact S9-61A of the switch is arranged on the working power supply incoming line switch cabinet and a standby power supply incoming line switch cabinet, a working position reserved contact S9-610A of the standby power supply switch is arranged on the standby power supply incoming line switch cabinet, a switching value signal S9-6100A formed by connecting two contacts in series through a lead is sent to the DCS cabinet, an AND gate is formed in DCS manual starting and fast switching logic, an output instruction is that an idle contact is sent to a fast switching logic unit manual switching end, the fast switching logic unit is started to perform manual switching, the fast switching logic unit can be manually started to switch a power supply only when the working incoming line switch and the standby incoming line switch are in working positions at the same time, the accident switching is not limited by the S9-61A, S9-610A contact, and when the power supply is switched, when the working power supply incoming line switch and the standby power supply incoming line switch are at working positions at the same time, namely two contacts S9-61A, S9-610A are closed at the same time, the DCS control logic can output an instruction and start the fast switching logic unit to manually switch, and the logic is as shown in the following figure 2, and the operation is carried out on a page of the fast switching logic unit on a display screen of the DCS cabinet;
2. meanwhile, a switch working position signal S9-6100A formed by connecting the working position reserved contact of the working power switch and the working position reserved contact of the standby power switch in series is used for controlling and starting an abnormal alarm unit to do alarm signal indication of 'working and standby power switch working positions' in a DCS system by a fast switching logic unit and is displayed on a display screen to prompt operating personnel;
3. the method is characterized in that synchronous detection relay contacts are added on closing loops of a working power supply incoming line switch cabinet and a standby power supply incoming line switch cabinet, detection voltages of a synchronous detection relay 1 are taken from bus voltages and incoming line power supply voltages, and when a fast switching logic unit fails to exit, an independent synchronous detection loop can ensure safety of manual parallel switching of service power supplies, as shown in fig. 3 and 4.
The working principle of the invention is as follows: when the switch is not in a working position, the DCS manual switching instruction cannot be sent out due to the unsatisfied condition, normal switching cannot be carried out, and accidents are prevented. An independent synchronous detection unit is added in a closing loop, so that the local and DCS remote manual and direct parallel closing system is prevented from being impacted.
While the preferred embodiments of the invention have been described, it is to be understood that the invention is not limited to the precise embodiments described, and that equipment and structures not described in detail are understood to be practiced as commonly known in the art; any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention by those skilled in the art can be made without departing from the technical scope of the present invention, and still fall within the protection scope of the technical solution of the present invention.
Claims (4)
1. A fast switching system for preventing the voltage loss of an auxiliary manual switching bus is characterized by comprising a working power supply incoming line switch cabinet, a standby power supply incoming line switch cabinet, a DCS cabinet, a fast switching logic unit and an abnormity warning unit, wherein a working power supply switch working position reserved contact is arranged on the working power supply incoming line switch cabinet, a standby power supply switch working position reserved contact is arranged on the standby power supply incoming line switch cabinet, the fast switching logic unit comprises a manual switching-on end and an output end, the DCS cabinet comprises a display screen and an operating button, the operating button is arranged on a display screen page, the operating button comprises a manual switching operating button, the manual switching operating button is connected with the fast switching-on end of the fast switching logic unit, the working power supply switch working position reserved contact and the standby power supply switch working position reserved contact are connected with the DCS cabinet through a lead in series connection after being used as a working position contact, and the working position contact and the manual switching operation button form an AND gate output instruction which is an empty contact, the AND gate output instruction is sent to the manual switching input end of the fast switching logic unit, and the fast switching logic unit is started to be manually switched.
2. The fast switching system for preventing voltage loss of the service power manual switching bus of claim 1, further comprising a synchronous detection relay connected in the incoming line loop of the working power incoming line switch cabinet and the standby power incoming line switch cabinet.
3. The fast switching system for preventing the service power manual switching bus from voltage loss according to claim 2, wherein the fast switching logic unit and the abnormal alarm unit are electrically connected with the display screen.
4. A method of preventing loss of voltage on service power manual switching bus using the fast switching system of claim 3, comprising:
1. the working position of a switch is reserved on a working power supply incoming line switch cabinet and a standby power supply incoming line switch cabinet, a switching value signal S9-6100A formed by connecting the two contacts in series through a lead is sent to the DCS cabinet, in the DCS manual starting fast switching logic, an AND gate is formed together with a manual switching operation button, an output instruction is that an empty contact is sent to a fast switching logic unit manual switching input end, and the fast switching logic unit is started to switch manually;
2. meanwhile, a switch working position signal S9-6100A formed by connecting the working position reserved contact of the working power switch and the working position reserved contact of the standby power switch in series is displayed on a display screen to prompt operating personnel, and a fast switching logic unit in the DCS system controls and starts an abnormal alarm unit to do alarm signal indication of 'working and standby power switch working positions';
3. the switching-on loop of the working power supply incoming line switch cabinet and the standby power supply incoming line switch cabinet is additionally provided with a synchronous detection relay contact, the detection voltage of the synchronous detection relay is taken from the bus voltage and the incoming line power supply voltage, and when the fast switching logic unit is failed to exit, the independent synchronous detection loop can ensure the safety of the manual parallel switching of the service power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010391110.0A CN111463896A (en) | 2020-05-11 | 2020-05-11 | Quick switching system and method for preventing voltage loss of service power manual switching bus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010391110.0A CN111463896A (en) | 2020-05-11 | 2020-05-11 | Quick switching system and method for preventing voltage loss of service power manual switching bus |
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| Publication Number | Publication Date |
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| CN111463896A true CN111463896A (en) | 2020-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010391110.0A Pending CN111463896A (en) | 2020-05-11 | 2020-05-11 | Quick switching system and method for preventing voltage loss of service power manual switching bus |
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| CN (1) | CN111463896A (en) |
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- 2020-05-11 CN CN202010391110.0A patent/CN111463896A/en active Pending
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