CN111769525B - Method for judging abnormal shutdown signal of power plant equipment - Google Patents
Method for judging abnormal shutdown signal of power plant equipment Download PDFInfo
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- CN111769525B CN111769525B CN202010603164.9A CN202010603164A CN111769525B CN 111769525 B CN111769525 B CN 111769525B CN 202010603164 A CN202010603164 A CN 202010603164A CN 111769525 B CN111769525 B CN 111769525B
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- 238000012423 maintenance Methods 0.000 claims description 28
- 238000005259 measurement Methods 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 9
- 230000002441 reversible effect Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 239000000446 fuel Substances 0.000 claims description 3
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- 238000010586 diagram Methods 0.000 description 12
- 238000012544 monitoring process Methods 0.000 description 9
- 230000009977 dual effect Effects 0.000 description 3
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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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
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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
- H02H7/22—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 distribution gear, e.g. bus-bar systems; for switching devices
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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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
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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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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Abstract
The invention discloses a method for judging abnormal shutdown signals of power plant equipment, which is used for ensuring that all working conditions can correctly report accident total signals and eliminating false alarm and false alarm conditions, wherein the problems that the existing various working conditions can not be accurately reported and the false alarm and false alarm often occur are solved by synthesizing the total judgment conditions of line switch interval accidents, synthesizing the total judgment conditions of main transformer switch interval accidents, synthesizing the total judgment conditions of generator interval accidents, synthesizing the total judgment conditions of starting backup transformer switches and synthesizing the total judgment conditions of bus-coupled interval accidents.
Description
Technical Field
The invention belongs to electrical equipment and electrical engineering, and particularly relates to a method for judging an abnormal shutdown signal of power plant equipment.
Background
The power dispatching is an important link for ensuring safe and stable operation of the power grid, and is mainly used for pre-judging safe and economic operation of the power grid according to real-time acquired equipment information, commanding field operators to operate and issuing various operation instructions when an accident occurs. With the development of scientific technology, monitoring and control means are continuously developed, monitoring capability is stronger, and data support provided by a power plant is also required to be more and more. The accident is always a signal remotely signaling the accident tripping of power plant equipment to a dispatching master station, and an alarm signal reflecting the accident tripping of a transformer substation or an electric interval of a power plant.
When abnormal shutdown happens in the operation of equipment such as generating sets, lines, main transformers and the like of a power plant, a total accident signal is generated. The accident always generates accident alarm when the power plant has an accident, and the total accident signal is sent to the dispatching master station through the telecontrol device, and the dispatching master station pushes the picture and starts an alarm sound according to the total accident signal. The accident total signal includes: the interval accident signal and the total accident signal of the whole plant need to be added in order to identify that the manual shutdown mode commonly adopted by the existing power plant depends on program reverse power protection action to safely shut down the power plant. The accident total signal is a symbolic signal for processing the work-in accident and is required to be correct, reliable and rapid. Currently, most power plants only have 'accident total signals', and the 'logical OR' of protection action signals in the plants are simply synthesized, and the protection signals used by the plants are not standardized and unified, so that the conditions of missed report and false report often occur, and the judgment of scheduling operators is influenced.
Disclosure of Invention
The invention aims to: the problems that the existing accident total signal is not standard enough, and the missing report and the false report often occur are solved by judging a line switch interval accident signal, a main transformer switch interval accident signal, a standby transformer switch interval accident signal, a generator switch interval accident signal and a bus-coupled switch interval accident signal.
The technical scheme adopted by the invention is as follows:
a method for judging abnormal shutdown signals of power plant equipment respectively identifies line interval accident total, main transformer interval accident total, generator interval accident total, starting and standby transformer interval accident total and bus connection interval accident total.
Further, the total line interval accident identification condition comprises a line switch interval accident signal, and the line switch interval accident signal comprises a line protection action signal collection, a primary differential protection action signal collection, a primary isolation disconnecting link switching-on position, a secondary differential protection action signal collection, a primary isolation disconnecting link switching-on position, a line switch switching-off position, a line switch maintenance pressing plate input, a line disconnecting link separating position, a line primary disconnecting link separating position and a line secondary disconnecting link separating position.
Furthermore, whether the line interval is in an operation state or a shutdown state is judged from the input of a line switch maintenance pressing plate, the separation of a line outlet disconnecting link and the separation of a line I female disconnecting link and a line II female disconnecting link, and an interval accident signal is locked when the line interval is in a non-operation state or the maintenance pressing plate input state, so that the interval accident signal cannot be triggered; when the line interval is in a running state, the line protection action or the bus busbar differential protection action is carried out, after a line switch is switched off, a protection action signal is kept for 3s, a line accident total signal is triggered, and the line interval accident total signal is automatically reset after being reported for 15 s; the total judgment conditions of the interval accidents of the circuit switches are synthesized, so that the total accident signals can be correctly reported under various working conditions, and the occurrence of false alarm and missed alarm can be eliminated.
Further, the main transformer interval accident general identification conditions comprise main transformer protection action signal collection, 1A/1B high-rise plant change action signal collection, I female differential protection action signal collection, I female isolation disconnecting link switching-on position, II female differential protection action signal collection, II female isolation disconnecting link switching-on position, main transformer switch switching-off position, main transformer switch overhaul pressing plate input, main transformer I female disconnecting link switching-off position and main transformer II female disconnecting link switching-off position.
Furthermore, whether the main transformer interval is in an operation state or a shutdown state is judged from the main transformer switch overhaul pressing plate input and the main transformer I or II mother knife switch separation, and an interval accident signal is locked when the main transformer interval is in a non-operation state or an overhaul state, so that the interval accident signal cannot be triggered; when a main transformer interval is in a running state, main transformer protection action or bus busbar differential protection action is carried out, after a main transformer switch is switched off, a protection action signal keeps 3s, a main transformer interval accident total signal is triggered, and the main transformer interval accident total signal is automatically reset after being reported for 15 s; the main transformer switch interval accident total judging conditions are synthesized, so that the accident total signal can be correctly reported under various working conditions, and the occurrence of false alarm and missed alarm conditions can be eliminated.
Further, the total recognition conditions of the generator interval accidents comprise generator protection action signal collection, main transformer protection action signal collection, 1A/1B high-rise substation protection action signal collection, generator switch opening positions, generator overhaul pressing plate input states, generator isolation switch opening positions and generator manual shutdown holding signals; the generator manual shutdown holding signal judging condition comprises a generator switching-on signal, a generator manual main fuel tripping signal, a generator set load less than 20% rated power judging condition and a generator outlet switch position, and further comprises a main transformer positive and female isolation switch closing position, a main transformer auxiliary and female isolation switch closing position, a main transformer circuit breaker closing position, a generator circuit breaker closing position and a generator isolation switch closing position to synthesize a generator instantaneous grid-connected signal, and further comprises a generator manual shutdown holding signal and a generator grid-connected holding signal which are switched in by a double-position relay of the generator manual shutdown instantaneous signal and the generator grid-connected instantaneous signal.
Furthermore, whether the generator is in an operation state or a shutdown state at intervals is judged from the positions of the generator maintenance pressing plate and the generator isolation disconnecting link, and an interval accident signal is locked when the generator is in a non-operation state or a maintenance state, so that the interval accident signal cannot be triggered; the protection action signals of generator protection action signal collection, main transformer protection action signal collection and 1A/1B high-rise transformer protection action signal collection are logically or synthetically sent to a measurement and control acquisition device in a hard wiring mode through a generator set distributed control system, when a generator interval is in an operation state, the generator protection action or the main transformer protection action or the high-rise transformer protection action is carried out, after a generator switch is switched off, the protection action signals are kept for 10s, and generator interval accident total signals are triggered; when the reverse power protection action is operated during manual brake opening and shutdown, the manual shutdown signal of the generator and the brake opening position of the switch of the generator are prevented from shaking for 3s, and the accident total signal is not reported mistakenly; the total judgment conditions of the interval accidents of the generator are synthesized, so that the total accident signals can be correctly reported under various working conditions, and the occurrence of false alarm and missed alarm can be eliminated.
Further, the total identification conditions of the interval accidents of the standby transformer substation comprise a standby transformer substation protection action signal collection, a primary differential protection action signal collection, a primary isolation disconnecting link closing position I, a primary differential protection action signal collection II, a standby transformer substation disconnecting position, a standby transformer substation overhauling pressing plate input, a standby transformer substation primary disconnecting link opening position and a standby transformer substation secondary disconnecting link opening position.
Furthermore, whether the starting-standby transformer interval is in an operating state or an off state is judged by switching in the starting-standby transformer switch overhaul pressing plate and switching off the I or II mother knife switch of the starting-standby transformer, and an interval accident signal is locked in a non-operating state or an overhaul state, so that the interval accident signal cannot be triggered; when the starting-standby transformer interval is in a running state, starting-standby transformer protection action or bus differential protection action of a bus where the starting-standby transformer interval is located, after a starting-standby transformer switch is switched off, a protection action signal is kept for 3s, a starting-standby transformer interval accident total signal is triggered, and the starting-standby transformer interval accident total signal is automatically reset after being reported for 15 s; the total judgment conditions of the interval accidents of the starting-up and switching-down switches are synthesized, so that the total accident signals can be correctly reported under various working conditions, and the situations of false alarm and missed alarm can be eliminated.
Further, the general identification conditions of the bus-coupled interval accidents comprise bus-coupled protection action signal collection, I bus differential protection action signal collection, II bus differential protection action signal collection, I bus isolation disconnecting link switching-on position, II bus isolation disconnecting link switching-on position, bus-coupled switch switching-off position, bus-coupled switch maintenance pressing plate input, bus-coupled I bus disconnecting link, bus-coupled II bus disconnecting link, whether the bus-coupled interval is in an operating state or a shutdown state is judged from the startup variable switch maintenance pressing plate input, the bus-coupled I bus or II bus disconnecting link switching-off position, and the interval accident signal is locked when the bus-coupled interval is in a non-operating state or a maintenance state, so that the interval accident signal can not be triggered, when the bus-tie interval is in a running state, any set of bus differential protection action or bus-tie protection action is carried out, after the bus-tie switch is switched off, triggering a bus-coupled accident total signal, keeping a protection action signal for 3s, and automatically resetting after reporting the bus-coupled interval accident total signal for 15 s; the total distinguishing conditions of the bus-tie interval accidents are synthesized, so that the accident total signal can be correctly reported under various working conditions, and the situations of misinformation and missing report can be eliminated.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the invention judges the line switch interval accident signal through the general identification condition of the line switch interval accident, judges the main transformer switch interval accident signal through the identification condition in the main transformer switch interval accident, judges the generator switch interval accident signal through the general identification condition of the generator interval accident, judges the standby transformer switch interval accident signal through the general identification condition of the standby transformer switch interval accident, judges the bus-bar switch interval accident signal through the general identification condition of the bus-bar interval accident, solves the problems that the prior various working conditions can not be accurately reported and the missing report and the false report frequently occur through the judgment of the signals, accurately identifies the interval accident general, the whole plant accident general and the manual shutdown signal of the unit of the power plant, ensures that the accident general is not mistakenly reported during the equipment maintenance period, and reports the accident general and the interval accident general when the interval accident trips occur, and reporting a manual shutdown signal when the unit is normally shutdown.
2. The generator manual shutdown keeps the signal condition, and the accident total signal is prevented from being triggered when the unit is manually and normally operated and is shut down.
3. According to the invention, when the generator set is shut down due to non-electrical reasons, such as boiler reasons, turbine reasons and important auxiliary engine reasons, the reverse power protection action of a trigger program is uniformly triggered through closing of the main throttle, under the condition of no manual shutdown signal, an accident total signal is triggered, and the generator interval accident can always include the electrical reason accident total and the non-electrical reason accident total.
4. According to the invention, when no operation switch tripping occurs, the current three-phase inconsistent protection of the switch is summarized into the protection action signal, so that the accident caused by the switch tripping is identified.
5. In the invention, the accident total merging type is accident total common merging remote signaling, and can be triggered, reset in a delayed mode and jitter eliminated according to requirements; the multi-trigger mode can be that after the signals are combined to act, the combined signals act again after the participation quantity acts again; the delayed recovery is automatically recovered at a set time; the jitter elimination setting is that the accident total is triggered only after the trigger time is exceeded, the intermediate process is avoided, and the jitter elimination setting is only effective on the rising edge.
Drawings
FIG. 1 is a logic diagram of overall plant accident identification;
FIG. 2 is a logic diagram of the overall line break incident identification;
FIG. 3 is a logic diagram of overall identification of a primary substation interval accident;
FIG. 4 is a logic diagram of the total identification of generator interval accidents;
FIG. 5 is a logic block diagram of generator manual shutdown identification;
FIG. 6 is a block diagram of generator transient grid connection signal identification logic;
FIG. 7 is a schematic diagram of a generator manual shutdown hold signal;
FIG. 8 is a logic diagram of the total identification of the alternate interval accidents during startup;
FIG. 9 is a logic diagram of bus tie interval accident total identification;
FIG. 10 is a schematic diagram of an independent composite implementation of the total pattern of incidents;
FIG. 11 is a diagram showing the relationship among the total accident computation apparatus, the telemechanical apparatus, and the scheduling EMS master station in FIG. 10;
FIG. 12 is a schematic diagram of electrical main connections for generator intervals, main transformer intervals, bus tie intervals, line intervals, and startup and standby transformer intervals;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A method for judging abnormal shutdown signals of power plant equipment respectively identifies line interval accident total, main transformer interval accident total, generator interval accident total, starting and standby transformer interval accident total and bus connection interval accident total.
Further, the total identification condition of the line interval accident comprises a line switch interval accident signal, and the line switch interval accident signal comprises line protection action signal collection, I mother differential protection action signal collection, I mother isolation disconnecting link switching-on position, II mother differential protection action signal collection, II mother isolation disconnecting link switching-on position, line switch switching-off position, line switch overhaul pressing plate input, line disconnecting link separating position, line I mother disconnecting link separating position and line II mother disconnecting link separating position.
Furthermore, whether the line interval is in an operation state or a shutdown state is judged from the input of a line switch maintenance pressing plate, the separation of a line outlet disconnecting link and the separation of a line I female disconnecting link and a line II female disconnecting link, and an interval accident signal is locked when the line interval is in a non-operation state or the maintenance pressing plate input state, so that the interval accident signal cannot be triggered; when the line interval is in a running state, the line protection action or the bus busbar differential protection action is carried out, after a line switch is switched off, a protection action signal is kept for 3s, a line accident total signal is triggered, and the line interval accident total signal is automatically reset after being reported for 15 s; the total judgment conditions of the interval accidents of the circuit switches are synthesized, so that the total accident signals can be correctly reported under various working conditions, and the occurrence of false alarm and missed alarm can be eliminated.
Further, the main transformer interval accident general identification conditions comprise main transformer protection action signal collection, 1A/1B high-rise plant change action signal collection, I female differential protection action signal collection, I female isolation disconnecting link switching-on position, II female differential protection action signal collection, II female isolation disconnecting link switching-on position, main transformer switch switching-off position, main transformer switch overhaul pressing plate input, main transformer I female disconnecting link switching-off position and main transformer II female disconnecting link switching-off position.
Further, whether the main transformer interval is in an operation state or a shutdown state is judged from the main transformer switch overhaul pressing plate input and the main transformer I or II main knife switch separation, and an interval accident signal is locked in a non-operation state or an overhaul state, so that the interval accident signal cannot be triggered; when a main transformer interval is in a running state, main transformer protection action or bus busbar differential protection action is carried out, after a main transformer switch is switched off, a protection action signal keeps 3s, a main transformer interval accident total signal is triggered, and the main transformer interval accident total signal is automatically reset after being reported for 15 s; the main transformer switch interval accident total judging conditions are synthesized, so that the accident total signal can be correctly reported under various working conditions, and the occurrence of false alarm and missed alarm conditions can be eliminated.
Further, the total recognition conditions of the generator interval accidents comprise generator protection action signal collection, main transformer protection action signal collection, 1A/1B high-rise substation protection action signal collection, generator switch disconnecting position, generator maintenance pressing plate input state, generator isolation disconnecting link disconnecting position and generator manual shutdown holding signals; the judgment condition of the generator manual shutdown hold signal comprises a generator switching-on signal, a generator manual main fuel tripping signal, a generator set load less than 20% rated power judgment condition and a generator outlet switch position to synthesize a generator manual shutdown instantaneous signal, and also comprises a main transformer positive female isolation switch closing position, a main transformer auxiliary female isolation switch closing position, a main transformer breaker closing position, a generator breaker closing position and a generator isolation switch closing position to synthesize a generator instantaneous grid-connected signal, and also comprises a generator manual shutdown hold signal and a generator grid-connected hold signal which are switched in by a double-position relay of the generator manual shutdown instantaneous signal and the generator grid-connected instantaneous signal.
Furthermore, whether the generator is in an operation state or a shutdown state at intervals is judged from the positions of the generator maintenance pressing plate and the generator isolation disconnecting link, and an interval accident signal is locked when the generator is in a non-operation state or a maintenance state, so that the interval accident signal cannot be triggered; the protection action signals of generator protection action signal collection, main transformer protection action signal collection and 1A/1B high-rise transformer protection action signal collection are logically or synthetically sent to a measurement and control acquisition device in a hard wiring mode through a generator set distributed control system, when a generator interval is in an operation state, the generator protection action or the main transformer protection action or the high-rise transformer protection action is carried out, after a generator switch is switched off, the protection action signals are kept for 10s, and generator interval accident total signals are triggered; when the reverse power protection action is operated during manual brake opening and shutdown, the manual shutdown signal of the generator and the brake separating position of a switch of the generator are prevented from shaking for 3s, and the accident total signal is not reported by mistake; the total judgment condition of the interval accidents of the generator is synthesized, so that the total accident signals can be correctly reported under various working conditions, and the occurrence of false alarm and missed alarm can be eliminated.
Further, the total identification conditions of the starting-standby transformer interval accidents comprise starting-standby transformer protection action signal collection, I mother differential protection action signal collection, I mother isolation disconnecting link switching-on position, II mother differential protection action signal collection, starting-standby transformer switch disconnecting position, starting-standby transformer switch overhaul pressing plate input, starting-standby transformer I mother disconnecting link disconnection and starting-standby transformer II mother disconnecting link disconnection.
Furthermore, whether the starting-standby transformer interval is in an operating state or an off state is judged by switching in the starting-standby transformer switch overhaul pressing plate and switching off the I or II mother knife switch of the starting-standby transformer, and an interval accident signal is locked in a non-operating state or an overhaul state, so that the interval accident signal cannot be triggered; when the starting-standby transformer interval is in a running state, starting-standby transformer protection action or bus differential protection action of a bus where the starting-standby transformer interval is located, after a starting-standby transformer switch is switched off, a protection action signal is kept for 3s, a starting-standby transformer interval accident total signal is triggered, and the starting-standby transformer interval accident total signal is automatically reset after being reported for 15 s; the synthesis of the total judgment condition of the interval accidents of the backup change switch can ensure that the total accident signals can be correctly reported under various working conditions and can also eliminate the occurrence of false alarm and missed alarm.
Further, the general identification conditions of the bus-coupled interval accidents comprise bus-coupled protection action signal collection, I bus differential protection action signal collection, II bus differential protection action signal collection, I bus isolation disconnecting link switching-on position, II bus isolation disconnecting link switching-on position, bus-coupled switch switching-off position, bus-coupled switch maintenance pressing plate input, bus-coupled I bus disconnecting link, bus-coupled II bus disconnecting link, whether the bus-coupled interval is in an operating state or a shutdown state is judged from the startup variable switch maintenance pressing plate input, the bus-coupled I bus or II bus disconnecting link switching-off position, and the interval accident signal is locked when the bus-coupled interval is in a non-operating state or a maintenance state, so that the interval accident signal can not be triggered, when the bus-tie interval is in a running state, any set of bus differential protection action or bus-tie protection action, after the bus-tie switch is switched off, triggering a bus-coupled accident total signal, keeping a protection action signal for 3s, and automatically resetting after reporting the bus-coupled interval accident total signal for 15 s; the total judgment conditions of the bus-tie interval accidents are synthesized, so that the accident total signals can be correctly reported under various working conditions, and the occurrence of false alarm and missed alarm can be eliminated.
The embodiment distinguishes the line switch interval accident signal through the total identification condition of the line switch interval accident, distinguishes the main transformer switch interval accident signal through the identification condition in the main transformer switch interval accident, distinguishes the generator switch interval accident signal through the total identification condition of the generator interval accident, distinguishes the standby transformer switch interval accident signal through the total identification condition of the standby transformer switch interval accident, distinguishes the bus-bar switch interval accident signal through the total identification condition of the bus-bar interval accident, solves the problems that the prior various working conditions can not be accurately reported and the missing report and the false report often occur through distinguishing the signals, accurately identifies the total interval accident, the total accident of the whole plant and the manual shutdown signal of the unit of the power plant, ensures that the total accident is not mistakenly reported during the equipment maintenance period, reports the total accident and the total accident when the interval accident trips occur, and reporting a manual shutdown signal when the unit is normally shutdown.
Specifically, a measurement and control device in a computer monitoring system collects a dual protection action signal and a locally configured three-phase inconsistent protection and circuit breaker protection action signal of a protection action signal in a line interval accident master, and when a switch is tripped secretly, an interval accident master signal is generated through local three-phase inconsistent protection actions.
Specifically, a measurement and control device in a computer monitoring system collects a protection action signal synthesized by a generator set distributed control system and a three-phase inconsistent protection and circuit breaker protection action signal configured on site, and when a switch jumps, the interval accident total signal is generated through the three-phase inconsistent protection action on site.
Specifically, a measurement and control device in a computer monitoring system collects a dual protection action signal and a locally configured three-phase inconsistent protection and circuit breaker protection action signal, and generates an interval accident total signal through local three-phase inconsistent protection action when a switch is stolen and jumped.
Specifically, a measurement and control device in a computer monitoring system collects a dual protection action signal and locally configured three-phase inconsistent protection and circuit breaker protection action signals of a protection action signal in a bus-tie interval accident total, and when a switch is stolen, the interval accident total signal is generated through locally three-phase inconsistent protection actions.
Specifically, the generator decentralized control system flexibly synthesizes generator protection, main transformer protection, high-rise substation protection, starting-standby substation protection action signals and manual shutdown signals, and ensures the collection of all protection action information; the collected signals are accessed into a measurement and control device in a computer network monitoring system in a hard contact mode, and the dependence of an accident master system on related systems is reduced.
In this embodiment, the computer monitoring system and the generator set decentralized control system are prior art, and therefore, detailed description thereof is omitted here.
Example 2
On the basis of the first embodiment, the embodiment provides an independent and synthesized total accident realization mode, wherein 2 total accident calculation devices and corresponding total accident acquisition devices are provided, the total accident calculation devices are used for judging after being connected with related signals of each interval measurement and control device, and transmitting the judged interval accident signals and the total factory accident signals to a telecontrol device, the total factory accident signals of an up-sending dispatching system are automatically returned after being kept for 15 seconds, the accident judgment signals are ensured to be correctly received by the dispatching system, the accident handling efficiency is improved, and the signals in the total accident include total line interval accident signals, total main transformer interval accident signals, total backup and backup transformer interval accident signals, total generator interval accident signals and total bus tie interval accident signals; in order to ensure the reliability of the uplink signals, two sets of independent devices can be adopted, double main configurations are met, and the data reliability is ensured.
Specifically, after the accident master establishes a connection with a computer network monitoring system, a generator set decentralized control system and a telemechanical system, the increase of the number of intervals can be realized only by increasing the point tables and logically configuring.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A method for judging abnormal shutdown signals of power plant equipment is characterized in that a line interval accident total, a main transformer interval accident total, a generator interval accident total, a standby transformer interval accident total and a bus-bar interval accident total are respectively identified, wherein the total identification conditions of the generator interval accident include generator protection action signal collection, main transformer protection action signal collection, 1A/1B high-rise plant transformer protection action signal collection, a generator switch opening position, a generator overhaul pressing plate input state, a generator isolation switch opening position and a generator manual shutdown maintaining signal; the generator manual shutdown hold signal discrimination condition comprises a generator switching-on signal, a generator manual main fuel trip signal, a generator set load less than 20% rated power discrimination condition and a generator outlet switch position to synthesize a generator manual shutdown instantaneous signal, and also comprises a main transformer positive main isolation switch closing position, a main transformer auxiliary main isolation switch closing position, a main transformer breaker closing position, a generator isolation switch closing position to synthesize a generator instantaneous grid-connected signal, and a generator manual shutdown hold signal and a generator grid-connected hold signal which are switched in by a double-position relay of the generator manual shutdown instantaneous signal and the generator grid-connected instantaneous signal, wherein whether the generator is in an operation state or a shutdown state or not is discriminated from the generator maintenance pressing plate switching-in and the generator isolation switch position, and during a non-operation state or a maintenance state, blocking the interval accident signal so that the interval accident signal is not triggered; the protection action signals of generator protection action signal collection, main transformer protection action signal collection and 1A/1B high-rise transformer protection action signal collection are logically or synthetically sent to a measurement and control acquisition device in a hard wiring mode through a generator set distributed control system, when a generator interval is in an operation state, the generator protection action or the main transformer protection action or the high-rise transformer protection action is carried out, after a generator switch is switched off, the protection action signals are kept for 10s, and generator interval accident total signals are triggered; when the reverse power protection action is operated during manual brake opening and shutdown, the manual shutdown signal of the generator and the brake opening position of the switch of the generator are prevented from shaking for 3s, and the accident total signal is not reported mistakenly; the total judgment conditions of the interval accidents of the generator are synthesized, so that the total accident signals can be correctly reported under various working conditions, and the occurrence of false alarm and missed alarm can be eliminated.
2. The method as claimed in claim 1, wherein the total identification condition of the line break accident includes a line switch break accident signal, and the line switch break accident signal includes a line protection action signal summary, a primary differential protection action signal summary, a primary isolation switch on position, a secondary differential protection action signal summary, a secondary isolation switch on position, a line switch off position, a line switch maintenance pressing plate input, a line switch off position, a line primary switch off position, a line secondary switch off position, and a line secondary switch off position.
3. The method for judging the abnormal shutdown signal of the power plant equipment according to claim 2, wherein whether the line interval is in an operation state or a shutdown state is judged from the input of the line switch maintenance pressing plate, the separation of the line outlet disconnecting link, the separation of the line I bus and the I I bus disconnecting link, and when the line interval is in the non-operation state or the maintenance pressing plate input state, the interval accident signal is locked, so that the interval accident signal cannot be triggered; when the line interval is in a running state, the line protection action or the bus differential protection action is carried out, after a line switch is switched off, a protection action signal is kept for 3s, a line accident total signal is triggered, and the line interval accident total signal is automatically reset after being reported for 15 s; the total distinguishing conditions of the interval accidents of the circuit switches are synthesized, so that the accident total signals can be correctly reported under various working conditions, and the situations of misinformation and missing report can be eliminated.
4. The method according to claim 1, wherein the main transformer interval accident total identification condition includes a main transformer protection operation signal summary, a 1A/1B high-rise plant fluctuation operation signal summary, a primary differential protection operation signal summary, a primary isolation switch on position, a secondary differential protection operation signal summary, a primary isolation switch on position, a primary switch off position, a main transformer switch maintenance pressing plate input, a primary transformer primary switch I off position, and a primary transformer secondary switch off position.
5. The method for determining the abnormal shutdown signal of the power plant equipment as claimed in claim 4, wherein the main transformer interval is determined whether to be in an operating state or a shutdown state by switching in the main transformer switch maintenance pressure plate and separating the main transformer I bus or I I bus blade switch, and the interval accident signal is blocked when the main transformer interval is in the non-operating state or the maintenance state, so that the interval accident signal is not triggered; when a main transformer interval is in an operating state, main transformer protection action or bus busbar differential protection action is carried out, after a main transformer switch is switched off, a protection action signal keeps 3s, a main transformer interval accident total signal is triggered, and the main transformer interval accident total signal is automatically reset after being reported for 15 s; the main transformer switch interval accident total judging conditions are synthesized, so that the accident total signal can be correctly reported under various working conditions, and the occurrence of false alarm and missed alarm conditions can be eliminated.
6. The method for determining the abnormal shutdown signal of the power plant equipment according to claim 1, wherein the total identification conditions of the startup transformer interval accidents comprise startup transformer protection action signal summary, I parent differential protection action signal summary, I parent isolation switch on position, I I parent differential protection action signal summary, startup transformer switch off position, startup transformer switch overhaul pressing plate input, startup transformer I parent switch off position and startup transformer II parent switch off position.
7. The method for judging the abnormal shutdown signal of the power plant equipment as claimed in claim 6, characterized in that whether the startup transformer interval is in an operation state or a shutdown state is judged from the startup transformer switch maintenance pressing plate input, the startup transformer I bus or the I I bus blade switch separation position, and an interval accident signal is locked when the startup transformer interval is in the non-operation state or the maintenance state, so that the interval accident signal is not triggered; when the starting-standby transformer interval is in a running state, starting-standby transformer protection action or bus differential protection action of a bus where the starting-standby transformer interval is located, after a starting-standby transformer switch is switched off, a protection action signal is kept for 3s, a starting-standby transformer interval accident total signal is triggered, and the starting-standby transformer interval accident total signal is automatically reset after being reported for 15 s; the total judgment conditions of the interval accidents of the starting-up and switching-down switches are synthesized, so that the total accident signals can be correctly reported under various working conditions, and the situations of false alarm and missed alarm can be eliminated.
8. The method as claimed in claim 7, wherein the total identification conditions of the bus tie interval accident include bus tie protection operation signal summary, I bus differential protection operation signal summary, I I bus differential protection operation signal summary, I bus isolation switch on position, II bus isolation switch on position, bus tie switch off position, bus tie switch overhaul pressure plate input, bus tie I bus switch off position, bus tie I I bus switch off position, whether the bus tie interval is in operation state or in shutdown state is determined from the startup change switch overhaul pressure plate input, bus tie I bus switch or I I bus switch off position, the interval accident signal is blocked when in non-operation state or in overhaul state, any set of bus differential protection action or bus tie protection action when the bus tie interval is in operation state, triggering a bus-tie accident total signal after a bus-tie switch is switched off, keeping a protection action signal for 3s, and automatically resetting after a bus-tie interval accident total signal is reported for 15 s; the total judgment conditions of the bus-tie interval accidents are synthesized, so that the accident total signals can be correctly reported under various working conditions, and the occurrence of false alarm and missed alarm can be eliminated.
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| CN106991859A (en) * | 2017-04-11 | 2017-07-28 | 国网浙江省电力公司培训中心 | Intelligent grid Dispatching Control System regulates and controls Integrated simulation experience system |
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