CN114094542A - Voltage protection method and control device - Google Patents

Voltage protection method and control device Download PDF

Info

Publication number
CN114094542A
CN114094542A CN202111408704.9A CN202111408704A CN114094542A CN 114094542 A CN114094542 A CN 114094542A CN 202111408704 A CN202111408704 A CN 202111408704A CN 114094542 A CN114094542 A CN 114094542A
Authority
CN
China
Prior art keywords
voltage
generator
voltage protection
preset value
smaller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111408704.9A
Other languages
Chinese (zh)
Inventor
屈佳宾
乔斌
王伟
李志强
田少波
万浩
万伟
王杨
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Inner Mongolia Guohua Zhungeer Power Generation Co Ltd
Original Assignee
Inner Mongolia Guohua Zhungeer Power Generation Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Inner Mongolia Guohua Zhungeer Power Generation Co Ltd filed Critical Inner Mongolia Guohua Zhungeer Power Generation Co Ltd
Priority to CN202111408704.9A priority Critical patent/CN114094542A/en
Publication of CN114094542A publication Critical patent/CN114094542A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • H02H7/06—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The application discloses voltage protection method and control device relates to the generator field to solve the problem that the safety and stability of a power system are influenced by voltage protection misoperation in the related art, and the protection method comprises the following steps: acquiring the generator terminal voltage of a generator and the working state of the generator; the generator terminal voltage is the voltage output by the generator to the main transformer; under the condition that the generator terminal voltage is determined to be smaller than a preset value and the generator is in the running state, triggering a voltage protection signal; and controlling a voltage protection device to execute a voltage protection action based on the voltage protection signal.

Description

Voltage protection method and control device
Technical Field
The present disclosure relates to the field of power generators, and particularly to a voltage protection method and a control device.
Background
In a power plant, a voltage protection device is common protection equipment, and when the voltage of a generator is lower than a certain value, a voltage protection action can be triggered by adopting the voltage protection device (such as a low-voltage protection device), so that the faults of over-current, over-temperature and even insulation damage of a generator winding caused by low-voltage operation of the generator are avoided, and the safety of a power system (the power system can comprise a power grid, the generator and auxiliary equipment thereof) is protected.
In the related art, generator terminal voltage is generally collected, and when the generator terminal voltage is lower than a set value, a voltage protection device triggers a voltage protection action, so that the safety of a power grid, a generator and auxiliary equipment of the generator is protected.
However, the related art has the problem that the safe and stable operation of the power grid is influenced due to the misoperation of the voltage protection. For example, under the condition that the generator is shut down and overhauled according to a plan, the generator set is disconnected from other parts (such as a power grid) of the power system, the voltage at the generator terminal is zero, the isolating switch at the outlet of the main transformer is disconnected, and the circuit breaker of the booster station operates in a loop closing mode. At the moment, under the condition that the voltage at the generator end is zero, the voltage protection device can detect that the voltage at the generator end is lower than a set value, and falsely triggers a voltage protection action to disconnect a booster station circuit breaker, so that the safe and stable operation of a power grid is influenced, and the safe and stable operation of a power system is further influenced.
Disclosure of Invention
The embodiment of the application provides a voltage protection method and a control device, and solves the problem that the safe and stable operation of a power system is influenced by voltage protection misoperation in the related art.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides a voltage protection method, including:
acquiring the generator terminal voltage of a generator and the working state of the generator; the generator terminal voltage is the voltage output by the generator to the main transformer;
under the condition that the generator terminal voltage is determined to be smaller than a preset value and the generator is in the running state, triggering a voltage protection signal;
and controlling a voltage protection device to execute a voltage protection action based on the voltage protection signal.
Optionally, in an embodiment of the present application, the protection method further includes:
acquiring the working state of the isolating switch; the isolating switch is a switch at the outlet of the main transformer;
determining that the generator is in an operational state with the isolator switch in a closed position.
Optionally, in this embodiment of the application, the triggering a voltage protection signal when it is determined that the generator terminal voltage is less than a preset value and the generator is in an operating state includes:
and triggering a voltage protection signal under the condition that the terminal voltage is smaller than a preset value and the isolating switch is in a switching-on position.
Optionally, in an embodiment of the present application, the terminal voltage includes a first line voltage, a second line voltage, and a third line voltage;
the terminal voltage being less than the preset value comprises: the first line voltage is smaller than a preset value, or the second line voltage is smaller than a preset value, or the third line voltage is smaller than a preset value;
under the condition that the terminal voltage is determined to be smaller than a preset value and the isolating switch is in a switching-on position, triggering a voltage protection signal comprises the following steps:
triggering a voltage protection signal under the condition that the first line voltage is smaller than a preset value and the isolating switch is in a switching-on position;
or, under the condition that the second line voltage is smaller than the preset value and the isolating switch is in the switching-on position, triggering a voltage protection signal;
or triggering a voltage protection signal under the condition that the third line voltage is smaller than the preset value and the isolating switch is in the switching-on position.
Optionally, in this embodiment of the application, controlling, based on the voltage protection signal, the voltage protection device to perform a voltage protection action includes:
and under the condition that the voltage protection signal is continuously triggered within a preset time period, controlling a voltage protection device to execute a voltage protection action based on the voltage protection signal.
In a second aspect, an embodiment of the present application provides a control apparatus, including:
the acquisition module is used for acquiring generator terminal voltage of the generator and the working state of the generator; the generator terminal voltage is the voltage output by the generator to the main transformer;
the trigger module is used for triggering a voltage protection signal under the condition that the generator terminal voltage is determined to be smaller than a preset value and the generator is in a running state;
and the control module is used for controlling the voltage protection device to execute voltage protection action based on the voltage protection signal.
Optionally, in an embodiment of the present application, the obtaining module is further configured to obtain a working state of the disconnecting switch; the isolating switch is a switch at the outlet of the main transformer;
the control device further comprises a determining module, wherein the determining module is used for determining that the generator is in an operating state under the condition that the isolating switch is in a switch-on position.
Optionally, in an embodiment of the present application, the triggering module is configured to trigger a voltage protection signal when it is determined that the terminal voltage is smaller than a preset value and the isolating switch is in a switch-on position.
Optionally, in an embodiment of the present application, the terminal voltage includes a first line voltage, a second line voltage, and a third line voltage; the terminal voltage being less than the preset value comprises: the first line voltage is smaller than a preset value, or the second line voltage is smaller than a preset value, or the third line voltage is smaller than a preset value;
the trigger module is specifically configured to:
triggering a voltage protection signal under the condition that the first line voltage is smaller than a preset value and the isolating switch is in a switching-on position;
or, under the condition that the second line voltage is smaller than the preset value and the isolating switch is in the switching-on position, triggering a voltage protection signal;
or triggering a voltage protection signal under the condition that the third line voltage is smaller than the preset value and the isolating switch is in the switching-on position.
Optionally, in an embodiment of the present application, the control module is specifically configured to: and under the condition that the voltage protection signal is continuously triggered within a preset time period, controlling a voltage protection device to execute a voltage protection action based on the voltage protection signal.
In the embodiment of the application, the generator terminal voltage of the generator and the working state of the generator are obtained; the generator terminal voltage is the voltage output by the generator to the main transformer; under the condition that the generator terminal voltage is determined to be smaller than a preset value and the generator is in the running state, triggering a voltage protection signal; and controlling a voltage protection device to execute a voltage protection action based on the voltage protection signal. Therefore, under the condition that the terminal voltage is smaller than the preset value and the generator is in the running state, the voltage protection signal is triggered; and under the condition that the generator is in an off-state, even if the terminal voltage is smaller than the preset value, the voltage protection signal can not be triggered. Therefore, under the condition that the generator is in the shutdown state, the voltage protection device can be prevented from triggering the voltage protection action by mistake, and the problem that the safe and stable operation of the power system is influenced by the voltage protection misoperation in the related art is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic flow chart of a voltage protection method according to an embodiment of the present application;
fig. 2 is a partial schematic structural block diagram of an electric power system provided in an embodiment of the present application;
FIG. 3 is a schematic flow chart diagram of another voltage protection method provided by an embodiment of the present application;
FIG. 4 is a schematic flow chart diagram of another voltage protection method provided by an embodiment of the present application;
fig. 5 is a schematic structural block diagram of a control device provided in an embodiment of the present application;
description of reference numerals:
201-a generator; 202-a main transformer; 203-an isolating switch; 204-a booster station; 205-booster station circuit breaker; 206-the grid; 207-a controller; 208-a voltage protection device; 209-service transformer; 210-service equipment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, 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 application.
The features of the terms first and second in the description and in the claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specified. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a mechanical or electrical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The technical solution of the present application may be applied to a power plant, for example, as shown in fig. 2, a power system may include: generator 201, main transformer 202, isolator 203, booster station 204, booster station circuit breaker 205, electric network 206, controller 207, voltage protection device 208, service transformer 209 and service equipment 210.
In a power plant, low voltage operation of generator 201 may affect stable operation of the power system. For example, when the generator 201 operates at a low voltage, overcurrent of the generator winding may be caused, and the generator winding may be over-heated or even damaged by the overcurrent of the winding; for another example, the stability of the parallel operation of the generators is impaired, causing the power system to oscillate or step out; for another example, when the voltage is too low, the service motor operates inertly, causing damage to the service equipment. Therefore, the voltage protection device can normally act when the voltage of the generator is reduced to a certain value, and the safety of a power grid, the generator and the auxiliary equipment of the generator is protected.
In the related art, the outlet logic of the voltage protection device only collects the generator terminal voltage as a judgment basis, and the risk of misoperation of the voltage protection device exists. For example, when the generator is shut down, the generator set is disconnected from the power system, the voltage at the generator terminal is zero, the isolating switch at the outlet of the main transformer is disconnected, and the circuit breaker of the booster station is in closed loop operation. At the moment, if the protection function of the voltage protection device is not withdrawn, the outlet mode is full stop or disconnection de-excitation, the outlet pressing plate is not withdrawn, the voltage protection device can execute voltage protection misoperation, and the booster station circuit breaker is disconnected, so that the safe and stable operation of a power grid is influenced, and the safe and stable operation of a power system is further influenced.
Based on this, the technical scheme of the application can consider two factors of generator terminal voltage and whether the generator is in the shutdown state at the same time when designing the control logic of the voltage protection action. Under the condition that the generator stops running, the voltage protection device cannot trigger voltage protection action, protection misoperation cannot be caused, the reliability of the voltage protection device is improved, and safe and stable running of a power system is guaranteed.
The voltage protection method provided by the embodiment of the present application is specifically described below with reference to fig. 1, fig. 3, and fig. 4.
Fig. 1 is a schematic flowchart of a voltage protection method according to an embodiment of the present disclosure.
As shown in fig. 1, the voltage protection method provided in the embodiment of the present application may include:
step 110: acquiring the generator terminal voltage of a generator and the working state of the generator; the generator terminal voltage is the voltage output by the generator to the main transformer;
step 120: under the condition that the generator terminal voltage is determined to be smaller than a preset value and the generator is in the running state, triggering a voltage protection signal;
step 130: and controlling a voltage protection device to execute a voltage protection action based on the voltage protection signal.
In step 110, referring to fig. 2, the generator terminal voltage refers to the voltage output by the generator 201 to the main transformer 202. The terminal voltage may comprise a three-phase alternating current voltage. The operating state of the generator may include the generator being in an on state or the generator being in an off state.
In the embodiment of the application, the terminal voltage of the generator can be obtained through sensors such as an electric quantity transmitter.
In the embodiment of the present application, the working state of the generator can be obtained in different manners. For example, whether the generator is in a shutdown state may be determined by determining whether the generator terminal voltage is zero. Also for example, it can be determined whether the generator is in a shutdown state by the position of the blade of the disconnector 203. Of course, there are other ways of determining, and the present application is not particularly limited.
In this embodiment of the application, the acquired generator terminal voltage and the operating state of the generator may be transmitted to the controller 207, and specifically, whether the generator terminal voltage is smaller than a preset value and whether the generator is in an operating state may be determined according to the acquired generator terminal voltage and the operating state of the generator. Under the condition that the terminal voltage is smaller than the preset value and the generator is in the running state, a voltage protection signal is triggered, and the voltage protection device 208 executes a voltage protection action based on the voltage protection signal to disconnect the booster station circuit breaker.
The controller 207 may be a local controller, or may be a personal workstation in a remote control system, and the present application is not limited in particular.
In step 120, the condition for triggering the voltage protection signal is not only that the terminal voltage is less than the preset value but also that the generator is in operation. That is, in the generator shutdown state, even if the terminal voltage is less than the preset value, the voltage protection signal is not triggered. Therefore, under the condition that the voltage at the generator terminal is zero (the generator is in a shutdown state), the voltage protection device can be prevented from triggering the voltage protection action by mistake, and the problem that the safe and stable operation of the power system is influenced by voltage protection misoperation in the related technology is solved.
In step 130, the voltage protection device is controlled to perform a voltage protection action based on the voltage protection signal. The voltage protection device executes voltage protection action to disconnect the booster station circuit breaker and protect the safety of a power grid, a generator and auxiliary electric equipment thereof. Of course, the voltage protection action may also be applied to other devices or switches, and the application is not particularly limited.
According to the voltage protection method provided by the embodiment of the application, the generator terminal voltage of the generator and the working state of the generator are obtained; the generator terminal voltage is the voltage output by the generator to the main transformer; under the condition that the generator terminal voltage is determined to be smaller than a preset value and the generator is in the running state, triggering a voltage protection signal; and controlling a voltage protection device to execute a voltage protection action based on the voltage protection signal. Therefore, under the condition that the terminal voltage is smaller than the preset value and the generator is in the running state, the voltage protection signal is triggered; and under the condition that the generator is in an off-state, even if the terminal voltage is smaller than the preset value, the voltage protection signal can not be triggered. Therefore, under the condition that the generator is in the shutdown state, the voltage protection device can be prevented from triggering the voltage protection action by mistake, and the problem that the safe and stable operation of the power system is influenced by the voltage protection misoperation in the related art is solved.
In one embodiment, as shown in FIG. 2, if the isolation switch 203 is in the on position, it can be determined that the generator 201 is in operation. That is, the operating state of the generator can be determined by the operating state of the disconnector. The following is an example of fig. 3.
As shown in fig. 3, the voltage protection method provided in the embodiment of the present application may include:
step 310: acquiring the working state of the isolating switch; the isolating switch is a switch at the outlet of the main transformer;
step 320: determining that the generator is in an operating state when the disconnecting switch is in a switching-on position;
step 330: and triggering a voltage protection signal under the condition that the terminal voltage is smaller than a preset value and the isolating switch is in a switching-on position.
In step 310, the operating state of the isolation switch can be obtained by whether the circuit in which the isolation switch is located is cut off. If the circuit where the isolating switch is located is in the power-on state, the isolating switch is in the switching-on position; if the loop where the isolating switch is located is in the non-energized state, the isolating switch is in the brake separating position.
In step 320, it may be determined that the generator is in an operational state with the isolation switch in the closed position. With the disconnector in the tripped position, it can be determined that the generator is off.
Step 330 may be a sub-step of step 120. In step 330, when it is determined that the terminal voltage is less than the preset value and the isolating switch is in the on position, it may be determined that the terminal voltage is less than the preset value and the generator is in the operating state, so as to accurately trigger the voltage protection signal.
Therefore, the working state of the generator is determined by the closing position of the isolating switch, calculation processing is not needed, and the working state of the generator can be determined quickly.
In a specific embodiment, the terminal voltage may be a three-phase ac voltage, and the terminal voltage may include three line voltages: accordingly, the terminal voltage being less than the preset value comprises: the first line voltage is smaller than a preset value, or the second line voltage is smaller than a preset value, or the third line voltage is smaller than a preset value. The following is an example of fig. 4.
As shown in fig. 4, the voltage protection method provided in the embodiment of the present application may include:
step 410: triggering a voltage protection signal under the condition that the first line voltage is smaller than a preset value and the isolating switch is in a switching-on position; or, under the condition that the second line voltage is smaller than the preset value and the isolating switch is in the switching-on position, triggering a voltage protection signal; or, under the condition that the third line voltage is smaller than the preset value and the isolating switch is in the switching-on position, triggering a voltage protection signal;
step 420: and under the condition that the voltage protection signal is continuously triggered within a preset time period, controlling a voltage protection device to execute a voltage protection action based on the voltage protection signal.
Wherein step 410 may be a sub-step of step 330 and step 420 may be a sub-step of step 130.
In step 410, if any one of the first line voltage, the second line voltage and the third line voltage is less than a preset value, it can be determined that the terminal voltage of the generator is less than the preset value. Thus, the voltage values of the different line voltages can represent the generator terminal voltage. Under the condition that one line voltage is smaller than the preset value, even if the other two line voltages are larger than the preset value, the generator terminal voltage of the generator can be determined to be smaller than the preset value, and the reliability of judging the generator terminal voltage of the generator is improved.
In step 420, in the case that the voltage protection signal is triggered continuously within the preset time period, the voltage protection device starts to perform the voltage protection action, i.e. the voltage protection action is delayed to perform immediately after the voltage protection signal is triggered. Thus, it is possible to prevent the voltage protection operation from being erroneously performed due to a failure such as an electromagnetic interference signal or a signal contact failure, and to improve the reliability of the voltage protection operation.
Based on the same concept as the method embodiment, the embodiment of the application also provides a control device.
The control device provided in the embodiment of the present application may perform the voltage protection method. In the embodiment of the present application, a control device executing a voltage protection method is taken as an example to describe the control device provided in the embodiment of the present application.
Fig. 5 is a schematic flowchart of a control device according to an embodiment of the present application.
As shown in fig. 5, an embodiment of the present application provides a control device, which may include:
an obtaining module 501, configured to obtain a generator terminal voltage of a generator and a working state of the generator; the generator terminal voltage is the voltage output by the generator to the main transformer;
a triggering module 502, configured to trigger a voltage protection signal when it is determined that the generator-side voltage is smaller than a preset value and the generator is in an operating state;
and a control module 503, configured to control the voltage protection device to perform a voltage protection action based on the voltage protection signal.
The control device that this application embodiment provided includes: the acquisition module is used for acquiring generator terminal voltage of the generator and the working state of the generator; the generator terminal voltage is the voltage output by the generator to the main transformer; the trigger module is used for triggering a voltage protection signal under the condition that the generator terminal voltage is determined to be smaller than a preset value and the generator is in a running state; and the control module is used for controlling the voltage protection device to execute voltage protection action based on the voltage protection signal. Therefore, under the condition that the terminal voltage is smaller than the preset value and the generator is in the running state, the voltage protection signal is triggered; and under the condition that the generator is in an off-state, even if the terminal voltage is smaller than the preset value, the voltage protection signal can not be triggered. Therefore, under the condition that the generator is in the shutdown state, the voltage protection device can be prevented from triggering the voltage protection action by mistake, and the problem that the safe and stable operation of the power system is influenced by the voltage protection misoperation in the related art is solved.
Optionally, in the control device provided in the embodiment of the present application, the obtaining module is further configured to obtain a working state of the disconnecting switch; the isolating switch is a switch at the outlet of the main transformer;
the control device further comprises a determining module, wherein the determining module is used for determining that the generator is in an operating state under the condition that the isolating switch is in a switch-on position.
Therefore, the working state of the generator is determined by the closing position of the isolating switch, calculation processing is not needed, and the working state of the generator can be determined quickly.
Optionally, in the control device provided in this embodiment of the present application, the triggering module is configured to trigger a voltage protection signal when it is determined that the terminal voltage is less than a preset value and the isolating switch is in a switch-on position.
Thus, under the condition that the terminal voltage is determined to be less than the preset value and the isolating switch is in the switching-on position, the voltage protection signal is triggered. The possibility of voltage protection misoperation can be reduced after the generator stops running, and the safe and stable running of the power system is ensured.
Optionally, in the control device provided in this embodiment of the present application, the terminal voltage includes a first line voltage, a second line voltage, and a third line voltage; the terminal voltage being less than the preset value comprises: the first line voltage is smaller than a preset value, or the second line voltage is smaller than a preset value, or the third line voltage is smaller than a preset value;
the trigger module is specifically configured to:
triggering a voltage protection signal under the condition that the first line voltage is smaller than a preset value and the isolating switch is in a switching-on position;
or, under the condition that the second line voltage is smaller than the preset value and the isolating switch is in the switching-on position, triggering a voltage protection signal;
or triggering a voltage protection signal under the condition that the third line voltage is smaller than the preset value and the isolating switch is in the switching-on position.
Thus, the voltage values of the different line voltages can represent the generator terminal voltage. Under the condition that one line voltage is smaller than the preset value, even if the other two line voltages are larger than the preset value, the generator terminal voltage of the generator can be determined to be smaller than the preset value, and the reliability of judging the generator terminal voltage of the generator is improved.
Optionally, in the control device provided in the embodiment of the present application, the control module is specifically configured to: and under the condition that the voltage protection signal is continuously triggered within a preset time period, controlling a voltage protection device to execute a voltage protection action based on the voltage protection signal.
Thus, the reliability of the voltage protection operation can be improved, and the voltage protection operation can be prevented from being erroneously executed due to a failure such as a signal contact failure.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (10)

1. A voltage protection method, characterized in that the protection method comprises:
acquiring the generator terminal voltage of a generator and the working state of the generator; the generator terminal voltage is the voltage output by the generator to the main transformer;
under the condition that the generator terminal voltage is determined to be smaller than a preset value and the generator is in the running state, triggering a voltage protection signal;
and controlling a voltage protection device to execute a voltage protection action based on the voltage protection signal.
2. The protection method according to claim 1, characterized in that the protection method further comprises:
acquiring the working state of the isolating switch; the isolating switch is a switch at the outlet of the main transformer;
determining that the generator is in an operational state with the isolator switch in a closed position.
3. The protection method according to claim 2, wherein in the case where it is determined that the terminal voltage is less than a preset value and the generator is in an operating state, triggering a voltage protection signal comprises:
and triggering a voltage protection signal under the condition that the terminal voltage is smaller than a preset value and the isolating switch is in a switching-on position.
4. The protection method of claim 3, wherein the terminal voltage comprises a first line voltage, a second line voltage, and a third line voltage;
the terminal voltage being less than the preset value comprises: the first line voltage is smaller than a preset value, or the second line voltage is smaller than a preset value, or the third line voltage is smaller than a preset value;
under the condition that the terminal voltage is determined to be smaller than a preset value and the isolating switch is in a switching-on position, triggering a voltage protection signal comprises the following steps:
triggering a voltage protection signal under the condition that the first line voltage is smaller than a preset value and the isolating switch is in a switching-on position;
or, under the condition that the second line voltage is smaller than the preset value and the isolating switch is in the switching-on position, triggering a voltage protection signal;
or triggering a voltage protection signal under the condition that the third line voltage is smaller than the preset value and the isolating switch is in the switching-on position.
5. The protection method according to claim 1, wherein controlling a voltage protection device to perform a voltage protection action based on the voltage protection signal comprises:
and under the condition that the voltage protection signal is continuously triggered within a preset time period, controlling a voltage protection device to execute a voltage protection action based on the voltage protection signal.
6. A control device, characterized in that the control device comprises:
the acquisition module is used for acquiring generator terminal voltage of the generator and the working state of the generator; the generator terminal voltage is the voltage output by the generator to the main transformer;
the trigger module is used for triggering a voltage protection signal under the condition that the generator terminal voltage is determined to be smaller than a preset value and the generator is in a running state;
and the control module is used for controlling the voltage protection device to execute voltage protection action based on the voltage protection signal.
7. The control device according to claim 6,
the acquisition module is also used for acquiring the working state of the isolating switch; the isolating switch is a switch at the outlet of the main transformer;
the control device further comprises a determining module, wherein the determining module is used for determining that the generator is in an operating state under the condition that the isolating switch is in a switch-on position.
8. The control device according to claim 7,
the trigger module is used for triggering a voltage protection signal under the condition that the terminal voltage is smaller than a preset value and the isolating switch is in a switch-on position.
9. The control device of claim 8, wherein the terminal voltage comprises a first line voltage, a second line voltage, and a third line voltage; the terminal voltage being less than the preset value comprises: the first line voltage is smaller than a preset value, or the second line voltage is smaller than a preset value, or the third line voltage is smaller than a preset value;
the trigger module is specifically configured to:
triggering a voltage protection signal under the condition that the first line voltage is smaller than a preset value and the isolating switch is in a switching-on position;
or, under the condition that the second line voltage is smaller than the preset value and the isolating switch is in the switching-on position, triggering a voltage protection signal;
or triggering a voltage protection signal under the condition that the third line voltage is smaller than the preset value and the isolating switch is in the switching-on position.
10. The control device of claim 6, wherein the control module is specifically configured to: and under the condition that the voltage protection signal is continuously triggered within a preset time period, controlling a voltage protection device to execute a voltage protection action based on the voltage protection signal.
CN202111408704.9A 2021-11-24 2021-11-24 Voltage protection method and control device Pending CN114094542A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111408704.9A CN114094542A (en) 2021-11-24 2021-11-24 Voltage protection method and control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111408704.9A CN114094542A (en) 2021-11-24 2021-11-24 Voltage protection method and control device

Publications (1)

Publication Number Publication Date
CN114094542A true CN114094542A (en) 2022-02-25

Family

ID=80304252

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111408704.9A Pending CN114094542A (en) 2021-11-24 2021-11-24 Voltage protection method and control device

Country Status (1)

Country Link
CN (1) CN114094542A (en)

Similar Documents

Publication Publication Date Title
US9502881B2 (en) Switchgear for controlling the energy supply of an electric motor connected thereto
CN103378583A (en) Feeder automation technical scheme based on intelligent rapid vacuum circuit breaker
CN201549868U (en) Low-voltage switch intelligent controller
CN210780092U (en) Arc and harmonic elimination device
CN203352192U (en) Direct current switch device
EP2744062B1 (en) A subsea system with ride-through protection
CN110867829B (en) Distribution transformer protection measurement and control device based on transformer overload capacity protection
CN208257694U (en) A kind of electric motor starting control device
CN114094542A (en) Voltage protection method and control device
CN108512203B (en) Distribution network protection device and method
CN112202238B (en) Automatic resetting method and system for factory power supply fast switching device
CN204905675U (en) Outdoor switch box with distribution fault handling function
CN111211545B (en) Method and system for protecting single-phase broken line at high-voltage side of transformer with balance winding
KR20100074829A (en) Breaker for high tension power board
CN214227819U (en) Generator-transformer group protection device and generator-transformer group protection equipment
CN103489723A (en) Air switch capable of being connected with sensor
CN105186457A (en) Low-voltage motor protection device
CN113725822A (en) Method and system for removing fault of 220kV bus
CN111477523A (en) Combined fuse, application device thereof and protection method of application device
CN112327152B (en) FC switch on-off time testing and zero sequence protection setting system and method thereof
CN214850437U (en) Circuit breaker protection circuit
CN219843421U (en) Automatic tripping circuit for tripping of 400V PC switch cabinet breaker
CN219918497U (en) Power supply device of intelligent current relay
CN216134265U (en) Three-phase inconsistent protection circuit
CN218447718U (en) Convenient thermal relay reset system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination