CN110994535B - Method and system for judging disconnection of excitation voltage measurement circuit - Google Patents
Method and system for judging disconnection of excitation voltage measurement circuit Download PDFInfo
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- CN110994535B CN110994535B CN201911086521.2A CN201911086521A CN110994535B CN 110994535 B CN110994535 B CN 110994535B CN 201911086521 A CN201911086521 A CN 201911086521A CN 110994535 B CN110994535 B CN 110994535B
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- excitation voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0038—Details of emergency protective circuit arrangements concerning the connection of the detecting means, e.g. for reducing their number
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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
- H02H7/06—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
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- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a method and a system for judging disconnection of an excitation voltage measurement loop. The method comprises the following steps: obtaining a reactive power value and an excitation voltage value; and judging whether the excitation voltage measurement loop is disconnected or not according to the reactive power value, the excitation voltage value and a disconnection criterion. By the method, the disconnection of the excitation voltage measurement loop can be judged, and important reference information is provided for protection related to the excitation voltage.
Description
Technical Field
The invention relates to a method for judging disconnection of a measurement circuit in relay protection, in particular to a method and a system for judging disconnection of an excitation voltage measurement circuit, and belongs to the field of relay protection of a power system.
Background
The protection of motors with excitation systems, such as generator protection devices and phase modulator protection devices, generally requires access to excitation voltages. The field voltage is generally used for field loss protection and rotor grounding protection, and is one of the main action amounts of these protections.
The reliability of the excitation voltage measurement loop is one of the important influencing factors of the reliability of the loss-of-field protection and the rotor grounding protection. When the excitation voltage measurement circuit is disconnected, the action behaviors of the protection are influenced, and for the loss-of-field protection, the disconnection of the excitation voltage measurement circuit can cause the misoperation of the rotor low-voltage criterion; for the rotor ground protection, the disconnection of the excitation voltage measurement loop can cause the failure of the protection function.
The existing generator protection device and phase modulator protection device do not judge the disconnection of the excitation voltage measurement circuit, so that the device cannot sense whether the excitation voltage is normal or not, and the reliability of important protection such as field loss protection and rotor grounding protection is affected.
Disclosure of Invention
In view of the defects of the prior art, the present invention aims to provide a method and a system for judging disconnection of an excitation voltage measurement circuit, so as to solve the problem that the disconnection of the excitation voltage measurement circuit is not judged in the prior art.
In order to achieve the purpose, the invention is realized by the following technical method:
a method for judging disconnection of an excitation voltage measurement loop comprises the following steps:
obtaining a reactive power value and an excitation voltage value;
and judging whether the excitation voltage measurement loop is disconnected or not according to the reactive power value, the excitation voltage value and a disconnection criterion.
Further, the disconnection criterion includes a disconnection criterion one and a disconnection criterion two.
Further, the judging method includes: and when the first disconnection criterion or the second disconnection criterion is met, disconnecting the excitation voltage measuring circuit, otherwise, not disconnecting the excitation voltage measuring circuit.
Further, the condition that the disconnection criterion one meets is that the exciting voltage value is smaller than the exciting voltage low-voltage fixed value and the duration that the reactive power value is larger than the reactive power high fixed value is larger than the criterion one-time delay fixed value.
Further, the condition that the disconnection criterion two is met is that the duration that the excitation voltage condition is met and the reactive power reduction condition is not met is longer than the delay fixed value of the criterion two.
Further, when the excitation voltage reduction condition is satisfied, the excitation voltage condition is satisfied.
Further, the excitation voltage reduction condition satisfies the following conditions:
the difference value between the excitation voltage value and the excitation voltage before the excitation voltage change time fixed value time is smaller than the excitation voltage change fixed value.
Further, the condition that the reactive power reduction condition is not satisfied is that the difference value between the reactive power value and the reactive power before the time of the reactive power change fixed value is greater than or equal to the reactive power change fixed value.
An excitation voltage measurement loop disconnection judging system, the system comprising:
an acquisition module: the method comprises the steps of obtaining a reactive power value and an excitation voltage value;
a judging module: and the device is used for judging whether the excitation voltage measuring loop is disconnected or not according to the reactive power value, the excitation voltage value and a disconnection criterion.
A line breakage judgment system for an excitation voltage measurement loop comprises a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate according to the instructions to perform the steps of the method described above.
Compared with the prior art, the invention has the following beneficial effects:
the method comprises the following steps of distinguishing normal operation or disconnection of an excitation voltage measuring circuit through the corresponding relation between excitation voltage and reactive power, wherein when the normal operation is carried out, the excitation voltage and the reactive power generally change in the same direction, a disconnection criterion is judged based on steady-state values of the excitation voltage and the reactive power, and when the excitation voltage is small and the reactive power is large, the disconnection of the excitation voltage measuring circuit is judged; the second disconnection criterion is judged based on the variation values of the excitation voltage and the reactive power, and when the excitation voltage becomes smaller and the reactive power does not change or becomes larger, the disconnection of the excitation voltage measurement circuit is judged.
Drawings
FIG. 1: a flow chart of a method for judging disconnection of an excitation voltage measurement loop;
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, a method for judging disconnection of an excitation voltage measurement circuit includes the following steps:
1. Low-voltage constant value E of excitation voltage set by relay protection device low High constant value Q of reactive power high Excitation voltage variation constant value E var Exciting voltage change time constant value t varE Excitation voltage change widening time t extE Constant value Q of reactive power variation var Time constant t of change of reactive power varQ Criterion 1 delay timing t 1 And criterion 2 delay timing t 2 These 9 constants.
2. Calculating reactive power value and excitation voltage value
3. Judging whether the exciting voltage is less than E low And the reactive power is greater than Q high Whether or not duration of (a) is greater than t 1 And if the disconnection criterion 1 is considered to be satisfied, otherwise, the disconnection criterion 1 is considered not to be satisfied.
4. Calculating the excitation voltage and t at the current moment varE The difference value of the excitation voltage before time is judged whether the difference value is less than E var If the excitation voltage reduction condition is considered to be satisfied, otherwise, the excitation voltage reduction condition is considered to be not satisfied.
5. If the excitation voltage reduction condition is satisfied, the excitation voltage condition is considered to be satisfied, otherwise, if the time that the excitation voltage reduction condition is not satisfied exceeds t extE Then the excitation voltage condition is deemed not to be satisfied.
6. Calculating the reactive power and t at the current moment varQ The difference value of the reactive power before the time is judged whether the difference value is less than Q var And if the reactive power reduction condition is considered to be satisfied, otherwise, the reactive power reduction condition is considered to be not satisfied.
7. Judging whether the duration time that the excitation voltage condition is satisfied and the reactive power reduction condition is not satisfied is more than t 2 And if the disconnection criterion 2 is considered to be satisfied, otherwise, the disconnection criterion 2 is considered not to be satisfied.
8. And if the disconnection criterion 1 is met or the disconnection criterion 2 is met, the excitation voltage measurement circuit is considered to be disconnected, otherwise, the excitation voltage measurement circuit is considered not to be disconnected.
An excitation voltage measurement loop disconnection judging system, the system comprising:
an acquisition module: the method comprises the steps of obtaining a reactive power value and an excitation voltage value;
a judging module: and the device is used for judging whether the excitation voltage measuring loop is disconnected or not according to the reactive power value, the excitation voltage value and a disconnection criterion.
A line breakage judgment system for an excitation voltage measurement loop comprises a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate according to the instructions to perform the steps of the method described above.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (3)
1. A method for judging disconnection of an excitation voltage measurement loop is characterized by comprising the following steps:
obtaining a reactive power value and an excitation voltage value;
judging whether the excitation voltage measuring circuit is disconnected or not according to the reactive power value, the excitation voltage value and a disconnection criterion;
The disconnection criterion comprises a disconnection criterion I and a disconnection criterion II; the judging method comprises the following steps: when the disconnection criterion I or the disconnection criterion II is met, the excitation voltage measurement circuit is disconnected, otherwise, the excitation voltage measurement circuit is not disconnected;
the disconnection criterion one meets the conditions that the exciting voltage value is smaller than the exciting voltage low-voltage fixed value and the duration time that the reactive power value is larger than the reactive power high fixed value is larger than a criterion one-time delay fixed value;
the second disconnection criterion is that the duration time that the excitation voltage condition is met and the reactive power reduction condition is not met is longer than the second criterion delay fixed value;
the condition that the excitation voltage condition is met is that the excitation voltage reduction condition is met, and then the excitation voltage condition is met;
the conditions that the excitation voltage reduction condition satisfies are:
the difference value between the excitation voltage value and the excitation voltage before the excitation voltage change time fixed value time is smaller than the excitation voltage change fixed value;
the condition that the reactive power reduction condition is not satisfied is that the difference value between the reactive power value and the reactive power before the time of the reactive power change constant value is more than or equal to the reactive power change constant value.
2. An excitation voltage measurement circuit disconnection judging system, characterized by, the system includes:
An acquisition module: the method comprises the steps of obtaining a reactive power value and an excitation voltage value;
a judging module: the device is used for judging whether the excitation voltage measuring loop is disconnected or not according to the reactive power value, the excitation voltage value and a disconnection criterion;
the disconnection criterion comprises a disconnection criterion I and a disconnection criterion II; the judging method comprises the following steps: when the disconnection criterion I or the disconnection criterion II is met, the excitation voltage measurement circuit is disconnected, otherwise, the excitation voltage measurement circuit is not disconnected;
the disconnection criterion one meets the conditions that the exciting voltage value is smaller than the exciting voltage low-voltage fixed value and the duration time that the reactive power value is larger than the reactive power high fixed value is larger than a criterion one-time delay fixed value;
the second disconnection criterion is that the duration time that the excitation voltage condition is met and the reactive power reduction condition is not met is longer than the second criterion delay fixed value;
the condition that the excitation voltage condition is met is that the excitation voltage reduction condition is met, and the excitation voltage condition is met;
the conditions that the excitation voltage reduction condition satisfies are:
the difference value between the excitation voltage value and the excitation voltage before the excitation voltage change time fixed value time is smaller than the excitation voltage change fixed value;
the condition that the reactive power reduction condition is not satisfied is that the difference value between the reactive power value and the reactive power before the time of the reactive power change constant value is more than or equal to the reactive power change constant value.
3. A disconnection judging system of an excitation voltage measuring loop is characterized by comprising a processor and a storage medium;
the storage medium is to store instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method of claim 1.
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| CN201911086521.2A CN110994535B (en) | 2019-11-08 | 2019-11-08 | Method and system for judging disconnection of excitation voltage measurement circuit |
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| CN108736444B (en) * | 2018-04-16 | 2021-08-24 | 中国电力科学研究院有限公司 | Phase modulator field loss protection method and system |
| CN108736445B (en) * | 2018-05-22 | 2020-03-20 | 南京南瑞继保电气有限公司 | Rotor ground protection secondary circuit disconnection judging method and device |
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