CN113765049A - Spare power automatic switching misoperation prevention device suitable for PT primary side disconnection in light load state - Google Patents
Spare power automatic switching misoperation prevention device suitable for PT primary side disconnection in light load state Download PDFInfo
- Publication number
- CN113765049A CN113765049A CN202110916692.4A CN202110916692A CN113765049A CN 113765049 A CN113765049 A CN 113765049A CN 202110916692 A CN202110916692 A CN 202110916692A CN 113765049 A CN113765049 A CN 113765049A
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- Prior art keywords
- voltage
- module
- switching device
- fuse
- primary side
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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
- H02H1/04—Arrangements for preventing response to transient abnormal conditions, e.g. to lightning or to short duration over voltage or oscillations; Damping the influence of dc component by short circuits in ac networks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
-
- 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
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
- H02H3/046—Signalling the blowing of a fuse
Abstract
The invention discloses a spare power automatic switching misoperation prevention device suitable for PT primary side disconnection in a light load state, which comprises: the sensor module is used for detecting the voltage at two ends of the PT primary side high-voltage fuse; the signal preprocessing module is used for preprocessing the voltage signal acquired by the sensor module and transmitting the voltage signal to the main control module; the main control module is used for carrying out logic calculation on the preprocessed signals, judging whether the high-voltage fuse is fused or not and transmitting a judgment result to the display module and the communication module; the display module displays the on-off state of the fuse; the communication module is used for transmitting the on-off state of the fuse to the transformer substation monitoring background and the spare power automatic switching device; and the power supply module is used for providing working power supply for the device. The invention can accurately judge whether the high-voltage fuse is fused in time, and lock the spare power automatic switching under the condition that the high-voltage fuse is fused, thereby avoiding the misoperation of the spare power automatic switching under the light load state of a line.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to a spare power automatic switching misoperation prevention device suitable for PT primary side disconnection in a light load state.
Background
The automatic spare power switching device is an automatic device which can automatically and rapidly switch a spare power supply into operation after a working power supply trips due to reasons, and plays an important role in maintaining the safe and reliable operation of a power system. One of the key conditions of the backup power automatic switching operation is to determine whether the voltage and current of the working power supply disappear, i.e., "no voltage" or "no current". However, the load of the power transmission line has a certain fluctuation and uncertainty. In a specific period, a part of 10kV and 35kV transmission lines may have a light load or no-load state (that is, a 'no-current' condition is met), and at this time, if a PT primary side high-voltage fuse is fused, the 'no-voltage' condition is also met, so that a spare power automatic switching malfunction is caused, and a working power supply is cut off by mistake.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problem to be solved by the invention is to provide the spare power automatic switching misoperation prevention device suitable for PT primary side disconnection in a light load state, and aiming at the line possibly with light load, the PT disconnection fault caused by fusing of the high-voltage fuse can be more accurately judged.
In order to solve the technical problems, the invention adopts the following technical scheme:
spare power automatic switching misoperation prevention device suitable for PT primary side disconnection in light load state comprises:
the sensor module is used for detecting the voltage at two ends of the PT primary side high-voltage fuse;
the signal preprocessing module is used for preprocessing the voltage signal acquired by the sensor module and transmitting the voltage signal to the main control module;
the main control module is used for carrying out logic calculation on the preprocessed signals, judging whether the high-voltage fuse is fused or not and transmitting the judgment result to the display module and the communication module;
the display module displays the on-off state of the fuse;
the communication module transmits the on-off state of the fuse to a transformer substation monitoring background and a spare power automatic switching device;
and the power supply module provides a working power supply for the spare power automatic switching misoperation prevention device.
Preferably, the logic that the main control module judges whether the high-voltage fuse is fused is as follows:
if U α 1> δ and U α 2< δ/2, it is determined that the α -phase high-voltage fuse is blown, where α is A, B, C phases, U α 1 is the voltage before the α -phase PT primary-side high-voltage fuse, U α 2 is the voltage after the PT primary-side high-voltage fuse, and δ is a set low-voltage threshold.
Preferably, still include light and report an emergency and ask for help or increased vigilance the module, light is reported an emergency and ask for help or increased vigilance that the module sent this looks high-voltage fuse to communication module sends the communication and reports an emergency and asks for help or increased vigilance when the high-voltage fuse of arbitrary looks melts, and communication module sends the communication to the spare power automatic switching device and reports an emergency and increased vigilance when three-phase high-voltage fuse melts, and spare power automatic switching device shutting is equipped with the automatic switching.
Preferably, the display module further displays the following information: whether three-phase voltage on the primary side of the PT through the front and the back of the high-voltage fuse is normal or not, whether the device normally operates or not and whether the spare power automatic switching is locked or not.
Preferably, the communication module further transmits the device running state and the spare power automatic switching locking state to a transformer substation monitoring background and the spare power automatic switching device.
Preferably, the shell of the sensor module is poured by epoxy resin and is installed at corresponding positions at two ends of the primary side high-voltage fuse of the PT in the bus voltage transformer cabinet.
According to the technical scheme, the voltage at two ends of the PT primary side high-voltage fuse is detected by the sensor module, and the main control module determines whether the high-voltage fuse is fused or not through logic judgment according to the voltage information at two ends of the PT primary side high-voltage fuse. Therefore, whether the high-voltage fuse is fused or not can be timely and accurately judged, the backup power automatic switching device is locked under the condition that the high-voltage fuse is fused, and the backup power automatic switching device is prevented from generating misoperation in a light-load state of a line. Meanwhile, alarm information such as fusing of the high-voltage fuse, locking of spare power automatic switching and the like is sent through light and communication signals, so that operation and maintenance personnel can master equipment fault information in time, and the improvement of the operation reliability of a power grid is facilitated.
The following detailed description and the accompanying drawings are included to provide a further understanding of the invention.
Drawings
The invention is further described with reference to the accompanying drawings and the detailed description below:
fig. 1 is a schematic structural diagram of a backup power automatic switching misoperation prevention device suitable for PT primary side disconnection in a light load state according to the present invention.
Fig. 2 is a wiring diagram and a panel layout diagram of the backup power automatic switching misoperation prevention device suitable for PT primary side disconnection in a light load state provided by the invention.
Fig. 3 is a logic block diagram of the high-voltage fuse fusing alarm, the backup power automatic switching misoperation prevention locking and the alarm provided by the invention.
Detailed Description
The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.
It will be appreciated by those skilled in the art that features from the examples and embodiments described below may be combined with each other without conflict.
The invention provides a spare power automatic switching misoperation prevention device suitable for PT primary side line breakage in a light load state, which can accurately identify and judge the fusing fault of a PT primary side high-voltage fuse, and lock the spare power automatic switching and send alarm information when the PT primary side high-voltage fuse is fused.
As shown in fig. 1 and 2, the backup power automatic switching misoperation prevention device for PT primary side disconnection in a light load state according to the present invention includes:
the sensor module is used for detecting the voltage at two ends of the PT primary side high-voltage fuse;
the signal preprocessing module is used for preprocessing the voltage signal acquired by the sensor module and transmitting the voltage signal to the main control module;
the main control module is used for carrying out logic calculation on the preprocessed signals, judging whether the high-voltage fuse is fused or not and transmitting the judgment result to the display module and the communication module;
the display module displays the on-off state of the fuse;
the communication module transmits the on-off state of the fuse to a transformer substation monitoring background and a spare power automatic switching device;
and the power supply module provides a working power supply for the spare power automatic switching misoperation prevention device.
As shown in fig. 3, the specific logic for determining whether the high-voltage fuse is blown or not is: and if U alpha 1> delta and U alpha 2< delta/2, judging that the alpha-phase high-voltage fuse is blown, wherein alpha is A, B, C phases, U alpha 1 is the voltage before the alpha-phase PT primary side high-voltage fuse, U alpha 2 is the voltage after the PT primary side high-voltage fuse, and delta is a set low-voltage threshold value.
Further, the display module displays the following information: whether three-phase voltage on the primary side of the PT through the front and the back of the high-voltage fuse is normal or not, whether the device normally operates or not and whether the spare power automatic switching is locked or not. And the communication module also transmits the running state of the device and the spare power automatic switching locking state to a transformer substation monitoring background and the spare power automatic switching device.
The signal preprocessing module performs necessary processing on the acquired information to meet the requirement of the main control module on input information. Reference may be made to existing signal processing techniques such as noise reduction filtering and the like.
As shown in fig. 2 and fig. 3, the automatic standby power supply system further comprises a light warning module, wherein the light warning module sends a light warning when any one phase of high-voltage fuse fuses are fused, the communication module sends a communication warning to the automatic standby power supply switching device when the three-phase high-voltage fuses are fused, and the automatic standby power supply switching device locks the automatic standby power supply switching device.
The sensor module adopt the induction capacitance voltage division principle, the shell uses the epoxy resin pouring, installs in the corresponding position at PT once side high-voltage fuse both ends in bus voltage transformer cabinet, still can provide the physics for the electrically conductive copper bar and support.
While the invention has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in many different forms without departing from the spirit and scope of the invention as set forth in the following claims. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (6)
1. Spare power automatic switching misoperation prevention device suitable for PT once side disconnection under light load state, its characterized in that includes:
the sensor module is used for detecting the voltage at two ends of the PT primary side high-voltage fuse;
the signal preprocessing module is used for preprocessing the voltage signal acquired by the sensor module and transmitting the voltage signal to the main control module;
the main control module is used for carrying out logic calculation on the preprocessed signals, judging whether the high-voltage fuse is fused or not and transmitting the judgment result to the display module and the communication module;
the display module displays the on-off state of the fuse;
the communication module transmits the on-off state of the fuse to a transformer substation monitoring background and a spare power automatic switching device;
and the power supply module provides a working power supply for the spare power automatic switching misoperation prevention device.
2. The automatic power switching device for preventing malfunction according to claim 1, wherein the automatic power switching device is adapted to prevent a primary side disconnection of a PT under a light load condition, and comprises: the logic that the main control module judges whether the high-voltage fuse is fused is as follows:
if U α 1> δ and U α 2< δ/2, it is determined that the α -phase high-voltage fuse is blown, where α is A, B, C phases, U α 1 is the voltage before the α -phase PT primary-side high-voltage fuse, U α 2 is the voltage after the PT primary-side high-voltage fuse, and δ is a set low-voltage threshold.
3. The automatic power switching device for preventing malfunction according to claim 2, wherein the automatic power switching device is adapted to prevent a primary side disconnection of the PT under a light load condition, and comprises: the automatic power switching device is characterized by further comprising a light warning module, wherein the light warning module sends out light warning of fusing of any phase of high-voltage fuse when the high-voltage fuse of the phase is fused, the communication module sends out communication warning when the three-phase high-voltage fuse is fused, the communication module sends out communication warning to the automatic power switching device, and the automatic power switching device is locked to be in automatic power switching.
4. The automatic power switching device for preventing malfunction according to claim 1, wherein the automatic power switching device is adapted to prevent a primary side disconnection of a PT under a light load condition, and comprises: the display module also displays the following information: whether three-phase voltage on the primary side of the PT through the front and the back of the high-voltage fuse is normal or not, whether the device normally operates or not and whether the spare power automatic switching is locked or not.
5. The automatic power switching device for preventing malfunction according to claim 4, wherein the automatic power switching device comprises: and the communication module also transmits the running state of the device and the spare power automatic switching locking state to a transformer substation monitoring background and the spare power automatic switching device.
6. The automatic power switching device for preventing malfunction according to claim 1, wherein the automatic power switching device is adapted to prevent a primary side disconnection of a PT under a light load condition, and comprises: and the shell of the sensor module is poured by epoxy resin and is arranged at the corresponding positions at two ends of a PT primary side high-voltage fuse in a bus voltage transformer cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110916692.4A CN113765049A (en) | 2021-08-11 | 2021-08-11 | Spare power automatic switching misoperation prevention device suitable for PT primary side disconnection in light load state |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110916692.4A CN113765049A (en) | 2021-08-11 | 2021-08-11 | Spare power automatic switching misoperation prevention device suitable for PT primary side disconnection in light load state |
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| CN113765049A true CN113765049A (en) | 2021-12-07 |
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| CN202110916692.4A Pending CN113765049A (en) | 2021-08-11 | 2021-08-11 | Spare power automatic switching misoperation prevention device suitable for PT primary side disconnection in light load state |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101699700A (en) * | 2009-11-19 | 2010-04-28 | 河南省电力公司许昌供电公司 | Method for preventing standby power auto-switching malfunction caused by load PT break under the condition of small load |
| CN102185287A (en) * | 2011-04-22 | 2011-09-14 | 杭州银湖电气设备有限公司 | Fuse state monitoring protection device and protection method |
| CN107329027A (en) * | 2017-05-26 | 2017-11-07 | 广西电网有限责任公司 | Suitable for the double-bus prepared auto restart TV broken string method of discrimination of underloading |
| CN216052066U (en) * | 2021-08-11 | 2022-03-15 | 国网浙江省电力有限公司绍兴供电公司 | PT once side high-voltage fuse fusing fault judgment device |
-
2021
- 2021-08-11 CN CN202110916692.4A patent/CN113765049A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101699700A (en) * | 2009-11-19 | 2010-04-28 | 河南省电力公司许昌供电公司 | Method for preventing standby power auto-switching malfunction caused by load PT break under the condition of small load |
| CN102185287A (en) * | 2011-04-22 | 2011-09-14 | 杭州银湖电气设备有限公司 | Fuse state monitoring protection device and protection method |
| CN107329027A (en) * | 2017-05-26 | 2017-11-07 | 广西电网有限责任公司 | Suitable for the double-bus prepared auto restart TV broken string method of discrimination of underloading |
| CN216052066U (en) * | 2021-08-11 | 2022-03-15 | 国网浙江省电力有限公司绍兴供电公司 | PT once side high-voltage fuse fusing fault judgment device |
Non-Patent Citations (1)
| Title |
|---|
| 张鑫桂: "分段备自投防误动改进分析", 《电工技术》, pages 1 - 2 * |
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