CN216052066U - PT once side high-voltage fuse fusing fault judgment device - Google Patents
PT once side high-voltage fuse fusing fault judgment device Download PDFInfo
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- CN216052066U CN216052066U CN202121865395.3U CN202121865395U CN216052066U CN 216052066 U CN216052066 U CN 216052066U CN 202121865395 U CN202121865395 U CN 202121865395U CN 216052066 U CN216052066 U CN 216052066U
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Abstract
The utility model discloses a PT primary side high voltage fuse fusing fault judgment device, which comprises: the sensor module is used for detecting the voltage at two ends of the PT primary side high-voltage fuse and comprises an A-phase two-end voltage UA1And UA2Voltage U across phase BB1And UB2Voltage U at both ends of phase CC1And UC2(ii) a And the voltage state display module is used for displaying the voltage at two ends of the PT primary side high-voltage fuse. By adopting the technical scheme, the voltage at two ends of the PT primary side high-voltage fuse is detected by the sensor module, and the voltage at two ends of the PT primary side high-voltage fuse is displayed by the voltage state display module, so that the voltage at two ends of the PT primary side high-voltage fuse can be usedAnd judging the PT disconnection fault caused by the fusing of the high-voltage fuse.
Description
Technical Field
The utility model relates to the technical field of power equipment, in particular to a fusing fault judgment device for a PT primary side high-voltage fuse.
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.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the utility model aims to provide a device for judging the fusing fault of a PT primary side high-voltage fuse, which is convenient for more accurately judging the PT disconnection fault caused by fusing of the high-voltage fuse through the voltage at two ends of the PT primary side high-voltage fuse for a line possibly having light load.
In order to solve the technical problems, the utility model adopts the following technical scheme:
PT once inclines high-voltage fuse fusing fault judgement device includes:
the sensor module is used for detecting the voltage at two ends of the PT primary side high-voltage fuse and comprises an A-phase two-end voltage UA1And UA2Voltage U across phase BB1And UB2Voltage U at both ends of phase CC1And UC2；
And the voltage state display module is used for displaying the voltage at two ends of the PT primary side high-voltage fuse.
Preferably, the logic for judging whether the high-voltage fuse is blown or not is as follows: 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.
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.
Preferably, the sensor module supports conductive copper bars at two ends of a primary side high-voltage fuse of a 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 voltage at two ends of the PT primary side high-voltage fuse is displayed by the voltage state display module, so that the PT disconnection fault caused by fusing of the high-voltage fuse can be judged through the voltage at two ends of the PT primary side high-voltage fuse.
And further, the spare power automatic switching device can be locked under the condition that the high-voltage fuse is fused, and the misoperation of the spare power automatic switching device under the light-load state of a line is avoided. Meanwhile, alarm information such as fusing of the high-voltage fuse and the like is sent out through light and communication signals, so that operation and maintenance personnel can master equipment fault information in time, and the operation reliability of the power grid is improved.
The following detailed description and the accompanying drawings are included to provide a further understanding of the utility model.
Drawings
The utility model 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 utility model.
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 utility model.
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 utility model 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 voltages at two ends of the PT primary side high-voltage fuse and comprises A-phase two-end voltages UA1 and UA2, B-phase two-end voltages UB1 and UB2 and C-phase two-end voltages UC1 and UC 2;
and the voltage state display module is used for displaying the voltage at two ends of the PT primary side high-voltage fuse.
Furthermore, in order to realize intelligent judgment and alarm of PT disconnection fault, the method also comprises
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 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 device.
Referring to fig. 3, the specific logic for determining whether the high-voltage fuse is blown or not is:
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.
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 utility model has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that the utility model is not limited thereto, and may be embodied in many different forms without departing from the spirit and scope of the utility model 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 (4)
- PT once inclines high-voltage fuse fusing fault judgement device, 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 and comprises an A-phase two-end voltage UA1And UA2Voltage U across phase BB1And UB2Voltage U at both ends of phase CC1And UC2；And the voltage state display module is used for displaying the voltage at two ends of the PT primary side high-voltage fuse.
- 2. The device of claim 1 for determining a fusing fault of a PT primary-side high-voltage fuse, wherein: the logic for judging whether the high-voltage fuse is fused is as follows: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.
- 3. The device of claim 1 for determining a fusing fault of a PT primary-side high-voltage fuse, wherein: 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.
- 4. The device of claim 3 for determining a fusing fault of a PT primary-side high-voltage fuse, wherein: the sensor module supports conductive copper bars at two ends of a primary side high-voltage fuse of a PT in a bus voltage transformer cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121865395.3U CN216052066U (en) | 2021-08-11 | 2021-08-11 | PT once side high-voltage fuse fusing fault judgment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121865395.3U CN216052066U (en) | 2021-08-11 | 2021-08-11 | PT once side high-voltage fuse fusing fault judgment device |
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| CN216052066U true CN216052066U (en) | 2022-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121865395.3U Active CN216052066U (en) | 2021-08-11 | 2021-08-11 | PT once side high-voltage fuse fusing fault judgment device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113765049A (en) * | 2021-08-11 | 2021-12-07 | 国网浙江省电力有限公司绍兴供电公司 | Spare power automatic switching misoperation prevention device suitable for PT primary side disconnection in light load state |
-
2021
- 2021-08-11 CN CN202121865395.3U patent/CN216052066U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113765049A (en) * | 2021-08-11 | 2021-12-07 | 国网浙江省电力有限公司绍兴供电公司 | Spare power automatic switching misoperation prevention device suitable for PT primary side disconnection in light load state |
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