CN109444790B - Method suitable for feeder terminal to identify working state of power supply voltage transformer - Google Patents
Method suitable for feeder terminal to identify working state of power supply voltage transformer Download PDFInfo
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- CN109444790B CN109444790B CN201811269550.8A CN201811269550A CN109444790B CN 109444790 B CN109444790 B CN 109444790B CN 201811269550 A CN201811269550 A CN 201811269550A CN 109444790 B CN109444790 B CN 109444790B
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- voltage transformer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
Abstract
The invention relates to the technical field of power distribution automation systems, in particular to a method suitable for a feeder terminal to identify the working state of a power supply voltage transformer. Aiming at the problem of matching PT operation and maintenance brought by large-scale application of an on-site feeder automatic switch in the overhead line distribution automation transformation in China at present, the method is simple, practical and reliable and suitable for the feeder terminal to identify the working state of the power supply voltage transformer, and the feeder terminal can quickly identify and alarm the working state of the power supply voltage transformer on two sides of the switch under the condition that the hardware configuration of the existing on-site feeder automatic switch is not increased. Compared with the traditional mode of finding PT faults through periodic inspection, the method can identify the working state of the power supply voltage transformer in real time, is simple, reliable and high in accuracy, can greatly reduce the inspection workload of operation and maintenance personnel, and improves the working efficiency.
Description
Technical Field
The invention relates to the technical field of power distribution automation systems, in particular to a method suitable for a feeder terminal to identify the working state of a power supply voltage transformer.
Background
According to the requirements of the action plan for construction and transformation of power distribution networks (2015-2020), published by the State energy agency, the coverage rate of the distribution automation is not lower than 90% in 2020. The in-place feeder automation has the advantages of simple and reliable logic, realization of automatic fault processing independent of communication, low construction cost and the like, and is widely applied to overhead line power distribution automation transformation in China at present. The in-situ feeder automation switch is generally provided with a power supply voltage transformer PT in front and at back, a three-phase five-column PT or a single-phase PT is arranged on the front side of the switch, and a single-phase PT is arranged on the rear side of the switch. The role of PT is two: one is to provide a stable power supply for the controller, and the other is to collect the line voltage for the logic judgment of voltage time type. The operation and maintenance of the PT are realized in a mode that personnel regularly patrol and maintain, the quantity of the PT is increased sharply, more and more operation and maintenance workload is brought to the operation and maintenance personnel, and the efficiency is low. Because feeder terminal belongs to smart machine, it is necessary to make the improvement to traditional PT fortune dimension mode, carries out logic judgement through information such as the voltage of the power transformer of gathering and the position state of switch body, realizes discerning PT state in real time, alleviates fortune dimension work load, promotes work efficiency.
Disclosure of Invention
In order to solve the above problems, the present invention provides a method suitable for a feeder terminal to identify a working state of a power supply voltage transformer, and the specific technical scheme is as follows:
when a 10kV distribution line normally runs, a feeder terminal FTU acquires the voltage of the power supply voltage transformer and the position state information of a switch body in real time, and identifies the working state of the power supply voltage in real time through logical operation. When the power supply voltage transformer is judged to be in fault or abnormal, the feeder line terminal generates alarm information of the fault or the abnormal of the power supply voltage transformer and uploads the alarm information to the power distribution automation master station.
Preferably, the specific step of identifying the working state of the power supply voltage in real time through logic operation is as follows:
(1) when a feeder terminal FTU acquires the voltage U of a preposed power supply voltage transformer of a switch body1Is greater than a set value k1U0Voltage U of post-power voltage transformer2Is greater than a set value k2U0If the switch position is on, the working states of the front power supply voltage transformer and the rear power supply voltage transformer are judged to be normal;
(2) when a feeder terminal FTU acquires the voltage U of a preposed power supply voltage transformer of a switch1Or voltage U of a postposition power supply voltage transformer2Is lower than a set value k2U0If the switch position is on, the voltage is determined to be lower than the set value k2U0The working state of the corresponding power supply voltage transformer is a fault state;
(3) when a feeder terminal FTU acquires the voltage U of a preposed power supply voltage transformer of a switch1Is greater than a set value k1U0Voltage U of post-power voltage transformer2Is greater than a set value k1U0And the switch position is in the fraction, then k1The working state of the voltage transformer of the fixed post-positioned power supply is abnormal because a false switching-off condition exists in the switch body or the voltage acquisition loop of the controller PT2 is abnormal.
Preferably, the U is0Is the rated output voltage, k, of the power supply voltage transformer1Is a coefficient, k2Are coefficients.
The invention has the beneficial effects that: aiming at the problem of matching PT operation and maintenance brought by large-scale application of an on-site feeder automatic switch in the overhead line distribution automation transformation in China at present, the method is simple, practical and reliable and suitable for the feeder terminal to identify the working state of the power supply voltage transformer, and the feeder terminal can quickly identify and alarm the working state of the power supply voltage transformer on two sides of the switch under the condition that the hardware configuration of the existing on-site feeder automatic switch is not increased. Compared with the traditional mode of finding PT faults through periodic inspection, the method can identify the working state of the power supply voltage transformer in real time, is simple, reliable and high in accuracy, can greatly reduce the inspection workload of operation and maintenance personnel, and improves the working efficiency.
Drawings
FIG. 1 is a schematic diagram of a feeder terminal identifying the operating state of a power supply voltage transformer in the present invention;
wherein, PT 1: front power supply voltage transformer, PT 2: a power supply voltage transformer is arranged at the back.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings in which:
as shown in fig. 1, in this embodiment, the feeder terminal can quickly realize automatic identification and alarm of the operating states of the power voltage transformers on both sides of the switch without adding the existing in-situ feeder automation switch hardware configuration. The method comprises the following specific steps:
when the 10kV distribution line normally operates, the feeder terminal FTU acquires information such as position states of the power supply voltage transformer and the switch body in real time, and identifies the working state of the power supply voltage in real time through logic operation. When faults or abnormalities such as gram drop, fuse tube blowing in the power voltage transformer or overall damage of the power voltage transformer are judged to occur to the power voltage transformer, the feeder terminal generates alarm information of the faults or the abnormalities of the power voltage transformer and uploads the alarm information to the power distribution automation main station. Because the DL/T634.5101-2002 protocol of the communication between the feeder terminal and the distribution automation master station system supports a balanced communication mode or adopts the DL/T634.5104-2002 protocol for communication, the feeder terminal actively transmits related alarm information to the distribution automation master station. The feeder terminal recognizes the working state of the power supply voltage transformer in real time and processes the working state according to the following logic:
(1) when a feeder terminal FTU acquires the voltage U of a preposed power supply voltage transformer PT1 of the switch1Is greater than a set value k1U0Voltage U of post power supply voltage transformer PT2 of switch2Is greater than a set value k1U0And if the switch position is closed, the working states of the front power supply voltage transformer PT1 and the rear power supply voltage transformer PT2 are judged to be normal.
(2) When a feeder terminal FTU acquires the voltage U of a preposed power supply voltage transformer PT1 of the switch1Or the voltage U of a post power supply voltage transformer PT22Is lower than a set value k2U0And the switch position is closed, the voltage is judged to be lower than the set value k2U0The working state of the corresponding power voltage transformer is a fault state due to the fact that the voltage transformer is dropped, a fusion tube inside the power voltage transformer is blown, or the whole power voltage transformer is damaged.
<c>When a feeder terminal FTU acquires the voltage U of a preposed power supply voltage transformer PT1 of the switch1Greater than a set value k1U0Voltage U of post power supply voltage transformer PT22Is greater than a set value k1U0And if the switch position is in the open position, the working state of the post power supply voltage transformer PT2 is judged to be abnormal, and the reason is that the switch body has a false open state or the voltage acquisition loop of the controller PT2 is abnormal.
In this embodiment, U0Is the rated output voltage, k, of the power supply voltage transformer1The value is 0.8, k2The value is 0.3. A voltage type load switch is adopted as a switch in a local type feeder automation line, a wireless network or optical fiber communication mode is adopted between a feeder terminal and a power distribution main station, and a DL/T634.5101-2002 balanced protocol or a DL/T634.5104-2002 protocol is adopted as a protocol.
The present invention is not limited to the above-described embodiments, which are merely preferred embodiments of the present invention, and the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A method for identifying the working state of a power supply voltage transformer suitable for a feeder terminal is characterized by comprising the following steps: when a 10kV distribution line normally runs, a feeder terminal FTU acquires the voltage of a power supply voltage transformer and the position state information of a switch body in real time, and identifies the working state of the power supply voltage in real time through logical operation; when the power supply voltage transformer is judged to be in fault or abnormal, the feeder line terminal generates alarm information of the fault or the abnormal of the power supply voltage transformer and uploads the alarm information to the power distribution automation master station;
the specific steps of identifying the working state of the power supply voltage in real time through logical operation are as follows:
(1) when a feeder terminal FTU acquires the voltage U of a preposed power supply voltage transformer of a switch body1Is greater than a set value k1U0Voltage U of post-power voltage transformer2Is greater than a set value k2U0If the switch position is on, the working states of the front power supply voltage transformer and the rear power supply voltage transformer are judged to be normal; the U is0The rated output voltage of the power supply voltage transformer is obtained;
(2) when a feeder terminal FTU acquires the voltage U of a preposed power supply voltage transformer of a switch1Or voltage U of a postposition power supply voltage transformer2Is lower than a set value k2U0If the switch position is on, the voltage is determined to be lower than the set value k2U0The working state of the corresponding power supply voltage transformer is a fault state;
(3) when a feeder terminal FTU acquires the voltage U of a preposed power supply voltage transformer of a switch1Is greater than a set value k1U0Voltage U of post-power voltage transformer2Is greater than a set value k1U0And if the switch position is open, the working state of the post power supply voltage transformer is judged to be abnormal because the switch body has false open or backSetting a power supply voltage transformer PT2 voltage acquisition loop to be abnormal; k is a radical of1Is a coefficient, k2Are coefficients.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811269550.8A CN109444790B (en) | 2018-10-29 | 2018-10-29 | Method suitable for feeder terminal to identify working state of power supply voltage transformer |
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| CN201811269550.8A CN109444790B (en) | 2018-10-29 | 2018-10-29 | Method suitable for feeder terminal to identify working state of power supply voltage transformer |
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| CN109444790B true CN109444790B (en) | 2021-05-04 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2506161B2 (en) * | 1988-09-09 | 1996-06-12 | 北陸電力株式会社 | Power system fault location method |
| CN102769338B (en) * | 2012-07-20 | 2014-04-30 | 国家电网公司 | Closed-loop operational control method for power distribution network |
| JP6373019B2 (en) * | 2014-03-06 | 2018-08-15 | 九州電力株式会社 | Simulated power supply device and normal weighing confirmation device |
| CN104734352B (en) * | 2015-03-10 | 2017-06-20 | 国家电网公司 | A kind of distribution line Loop Closing Operation control method |
| CN204481571U (en) * | 2015-03-10 | 2015-07-15 | 国家电网公司 | A kind of Loop Closing Operation in Distribution Network control system based on terminal peer-to-peer communications |
| CN106771545B (en) * | 2017-01-25 | 2019-06-14 | 江苏大烨智能电气股份有限公司 | A kind of intelligent identification Method of 10kV line short fault voltage |
| CN207117169U (en) * | 2017-09-05 | 2018-03-16 | 河北北恒电气科技有限公司 | Power distribution automation Feeder Terminal Unit for 10KV overhead line fault detects |
| CN108304634B (en) * | 2018-01-23 | 2021-06-04 | 国网江西省电力有限公司电力科学研究院 | 10kV pole-mounted vacuum switch state evaluation method based on multi-source data |
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