CN114879096A - Detection method for abnormal parallel connection of secondary voltage buses - Google Patents
Detection method for abnormal parallel connection of secondary voltage buses Download PDFInfo
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- CN114879096A CN114879096A CN202210594267.2A CN202210594267A CN114879096A CN 114879096 A CN114879096 A CN 114879096A CN 202210594267 A CN202210594267 A CN 202210594267A CN 114879096 A CN114879096 A CN 114879096A
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- power frequency
- detection element
- overcurrent detection
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
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Abstract
The invention discloses a detection method for abnormal parallel connection of secondary voltage buses, which comprises the following specific steps: building a voltage small bus; the small voltage bus is respectively connected with a bus voltage transformer I and a bus voltage transformer II; the N600 line shared by the I bus voltage transformer and the II bus voltage transformer is grounded; a power frequency overcurrent detection element is arranged on the line body of the N600, and the power frequency overcurrent detection element collects the current of the N600 branch shared by the I bus voltage transformer and the II bus voltage transformer; the current flowing through the power frequency overcurrent detection element is compared with a set threshold value in the power frequency overcurrent detection element, when the current exceeds the threshold value, the circuits are considered to be connected in parallel, and the power frequency overcurrent detection element drives the alarm to output. The detection device has the advantages that the current monitoring point is inserted into the proper position of the working circuit, the power frequency overcurrent element is used for detecting and judging, when the secondary voltage buses are connected in parallel, the abnormal operation working condition is sensitively detected, the detection efficiency is high, the detection effect is good, the workload is low, the operation is easy, and the wide popularization is easy.
Description
Technical Field
The invention relates to the technical field of detection methods, in particular to a detection method for abnormal parallel connection of secondary voltage buses.
Background
When a 220kV double-bus connection mode is adopted, abnormal parallel connection of secondary voltage buses can be caused due to abnormal loop switching in the operation of a power plant and a transformer substation, the secondary voltage cannot completely correspond to a primary system, the secondary voltage is tripped during idle opening, the voltage of a small bus is reduced, and the heavy bus causes tripping of outgoing line protection actions. The secondary voltage air switch tripping operation, the voltage switching plug-in burning loss and other accident situations occur in the field switching operation process, the checking result is mostly the abnormal parallel connection of the secondary voltage, the serious consequence of the abnormal parallel connection is considered, and a detection method which can give operation early warning and early eliminate accident hidden danger is urgently needed.
Disclosure of Invention
In order to comprehensively solve the problems, particularly the defects in the prior art, the invention provides a method for detecting abnormal parallel connection of secondary voltage buses, which can comprehensively solve the problems.
In order to achieve the purpose, the invention adopts the following technical means:
a detection method for abnormal parallel connection of secondary voltage buses comprises the following specific detection methods:
the first step is as follows: building a voltage small bus;
the second step is as follows: the small voltage bus is respectively connected with a bus voltage transformer I and a bus voltage transformer II;
the third step: the I bus voltage transformer and the II bus voltage transformer share the N600 bus and are grounded;
the fourth step: a power frequency overcurrent detection element is installed on the line body section of the N600, and the power frequency overcurrent detection element collects the current of the N600 branch shared by the I mother voltage transformer and the II mother voltage transformer;
the fifth step: the current flowing through the power frequency overcurrent detection element is compared with a set threshold value in the power frequency overcurrent detection element, when the current exceeds the threshold value, the circuits are considered to be connected in parallel, and the power frequency overcurrent detection element drives the alarm to output.
Further, the I female voltage transformer and the II female voltage transformer are both 220kV capacitor voltage transformers.
The beneficial effects are that, the setting can be convenient for the female voltage transformer I and the female voltage transformer II to connect the high-voltage bus, so as to extract the system voltage parameter and effectively improve the secondary voltage bus application ranges of the female voltage transformer I and the female voltage transformer II.
Furthermore, the power frequency overcurrent detection element directly adopts the current of the N600 branch circuit by being connected in the working circuit in series.
The beneficial effects are that, this kind of setting can effectively reduce intermediate link transmission error, can effectively improve power frequency and overflow detecting element's detection efficiency.
Furthermore, the power frequency overcurrent detection element is an electrical parameter tester.
The power frequency overcurrent detection device has the advantages that the electric parameter tester has multiple detection parameters and high detection precision, and meanwhile, the power frequency overcurrent detection device is provided with the alarm device, so that the detection effect of the power frequency overcurrent detection element can be effectively improved.
Furthermore, the precision range of the power frequency overcurrent detection element is 0.01-5A.
The beneficial effects of the above are that, whether the power frequency overcurrent detection element is used for effectively detecting whether the secondary voltage bus is connected in parallel or not can be conveniently realized by the arrangement.
Furthermore, a 5-10 s delay link is set in the power frequency overcurrent detection element.
The power frequency overcurrent detection element has the beneficial effects that the power frequency overcurrent detection element can avoid system transient interference by the arrangement, and the working efficiency of the power frequency overcurrent detection element is effectively improved.
Furthermore, a 10s time delay link is set in the power frequency overcurrent detection element.
The beneficial effects are that, the setting can effectively avoid the transient interference of the system, and can effectively ensure the normal work of the power frequency overcurrent detection element.
Further, the alarm threshold value set by the power frequency overcurrent detection element is 15-30 mA.
The power frequency overcurrent detection device has the advantages that the sensitivity of the power frequency overcurrent detection device during detection can be improved through the arrangement, and the working effect of the power frequency overcurrent detection device is effectively improved.
Further, the alarm threshold value set by the power frequency overcurrent detection element is 15 mA.
The power frequency overcurrent detection element has the advantages of being good in sensitivity and working effect.
The invention has the beneficial effects that:
according to the invention, the current monitoring point is inserted into the proper position of the working circuit, and the power frequency overcurrent element is used for detecting and judging, so that the abnormal operation working condition is sensitively detected when the secondary voltage buses are connected in parallel, the overall detection efficiency is high, the detection effect is good, the workload is low, the operation is easy, and the wide popularization is easy.
Drawings
FIG. 1 is a wiring diagram of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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 invention.
Example 1
As shown in fig. 1, the present invention provides a method for detecting abnormal parallel connection of secondary voltage buses, which specifically comprises the following steps:
the first step is as follows: building a voltage small bus;
the second step is as follows: the small voltage bus is respectively connected with a bus voltage transformer I and a bus voltage transformer II;
the third step: the I bus voltage transformer and the II bus voltage transformer share the N600 bus and are grounded;
the fourth step: a power frequency overcurrent detection element is installed on the line body section of the N600, and the power frequency overcurrent detection element collects the current of the N600 branch shared by the I mother voltage transformer and the II mother voltage transformer;
the fifth step: the current flowing through the power frequency overcurrent detection element is compared with a set threshold value in the power frequency overcurrent detection element, when the current exceeds the threshold value, the circuits are considered to be connected in parallel, and the power frequency overcurrent detection element drives the alarm to output.
Principle of operation
As shown in fig. 1, a monitoring point is inserted into a proper position of a working circuit, no loop exists in normal operation, and no current flows in a detection branch; when abnormal parallel connection is carried out, a loop is formed through the parallel connection point, the voltage difference between the secondary voltages of the two groups of buses enables the connected loop to flow current, and the overcurrent alarm threshold value is set, so that the abnormal operation condition of the parallel connection of the secondary voltage buses can be detected.
Example 2
As shown in fig. 1, the present invention provides a method for detecting abnormal parallel connection of secondary voltage buses, which specifically comprises the following steps:
the first step is as follows: building a voltage small bus;
the second step is as follows: the small voltage bus is respectively connected with a bus voltage transformer I and a bus voltage transformer II;
the third step: the I bus voltage transformer and the II bus voltage transformer share the N600 bus and are grounded;
the fourth step: a power frequency overcurrent detection element is installed on the line body section of the N600, and the power frequency overcurrent detection element collects the current of the N600 branch shared by the I mother voltage transformer and the II mother voltage transformer;
the fifth step: the current flowing through the power frequency overcurrent detection element is compared with a set threshold value in the power frequency overcurrent detection element, when the current exceeds the threshold value, the circuits are considered to be connected in parallel, and the power frequency overcurrent detection element drives the alarm to output.
The I female voltage transformer and the II female voltage transformer are both 220kV capacitor voltage transformers. The arrangement can facilitate the connection of the I and II mother voltage transformers with the high-voltage bus, so as to extract the voltage parameters of the system and effectively improve the application ranges of the secondary voltage buses of the I and II mother voltage transformers.
The power frequency overcurrent detection element directly adopts the current of the N600 branch circuit by being connected in the working circuit in series. The setting can effectively reduce the transmission error of the intermediate link and effectively improve the detection efficiency of the power frequency overcurrent detection element.
The power frequency overcurrent detection element is an electrical parameter tester. The electric parameter tester has a plurality of detection parameters and high detection precision, and meanwhile, the power frequency overcurrent detection element has an alarm device, so that the detection effect of the power frequency overcurrent detection element can be effectively improved.
Example 3
As shown in fig. 1, the present invention provides a method for detecting abnormal parallel connection of secondary voltage buses, which specifically comprises the following steps:
the first step is as follows: building a voltage small bus;
the second step is as follows: the small voltage bus is respectively connected with a bus voltage transformer I and a bus voltage transformer II;
the third step: the I bus voltage transformer and the II bus voltage transformer share the N600 bus and are grounded;
the fourth step: a power frequency overcurrent detection element is installed on the line body section of the N600, and the power frequency overcurrent detection element collects the current of the N600 branch shared by the I mother voltage transformer and the II mother voltage transformer;
the fifth step: the current flowing through the power frequency overcurrent detection element is compared with a set threshold value in the power frequency overcurrent detection element, when the current exceeds the threshold value, the circuits are considered to be connected in parallel, and the power frequency overcurrent detection element drives the alarm to output.
The precision work range of the power frequency overcurrent detection element is 0.01-5A. The arrangement can facilitate the power frequency overcurrent detection element to effectively detect whether the secondary voltage bus is abnormally connected in parallel.
And a 5-10 s delay link is set in the power frequency overcurrent detection element. The arrangement can enable the power frequency overcurrent detection element to avoid system transient interference, and effectively improve the working efficiency of the power frequency overcurrent detection element.
A10 s time delay link is set in the power frequency overcurrent detection element. The setting can effectively avoid the transient interference of the system and effectively ensure the normal work of the power frequency overcurrent detection element.
The alarm threshold value set by the power frequency overcurrent detection element is 15-30 mA. The arrangement can improve the sensitivity of the power frequency overcurrent detection element during detection and effectively improve the working effect of the power frequency overcurrent detection element.
The alarm threshold value set by the power frequency overcurrent detection element is 15 mA. The power frequency overcurrent detection element has the best sensitivity, and the power frequency overcurrent detection element has the best working effect.
The present invention is illustrated by way of example and not by way of limitation. It will be apparent to those skilled in the art that other variations and modifications may be made in the foregoing disclosure without departing from the spirit or essential characteristics of all embodiments, and that all changes and modifications apparent from the above teachings are within the scope of the invention.
Claims (9)
1. A detection method for abnormal parallel connection of secondary voltage buses is characterized by comprising the following specific detection methods:
the first step is as follows: building a voltage small bus;
the second step is as follows: the small voltage bus is respectively connected with a bus voltage transformer I and a bus voltage transformer II;
the third step: the I bus voltage transformer and the II bus voltage transformer share the N600 bus and are grounded;
the fourth step: installing a power frequency overcurrent detection element on the line body section of the N600, wherein the power frequency overcurrent detection element collects the current of the N600 branch shared by the I mother voltage transformer and the II mother voltage transformer;
the fifth step: the current flowing through the power frequency overcurrent detection element is compared with a set threshold value in the power frequency overcurrent detection element, when the current exceeds the threshold value, the circuits are considered to be connected in parallel, and the power frequency overcurrent detection element drives the alarm to output.
2. The method according to claim 1, wherein the I-busbar voltage transformer and the II-busbar voltage transformer are both 220kV capacitor voltage transformers.
3. The method for detecting the abnormal parallel connection of the secondary voltage buses as claimed in claim 1, wherein the power frequency overcurrent detecting element is connected in series with the working circuit to directly adopt the current of the N600 branch.
4. The method according to claim 3, wherein the power frequency overcurrent detection element is an electrical parameter tester.
5. The method for detecting abnormal parallel connection of secondary voltage buses as claimed in claim 4, wherein the fine work range of the power frequency overcurrent detection element is 0.01-5A.
6. The method for detecting abnormal parallel connection of secondary voltage buses as claimed in claim 5, wherein a 5-10 s delay link is set in the power frequency overcurrent detection element.
7. The method according to claim 6, wherein a 10s delay link is set in the power frequency overcurrent detection element.
8. The method for detecting the abnormal parallel connection of the secondary voltage buses as claimed in claim 7, wherein the alarm threshold value set by the power frequency overcurrent detection element is 15-30 mA.
9. The method for detecting abnormal parallel connection of secondary voltage buses as claimed in claim 8, wherein the alarm threshold set by the power frequency overcurrent detection element is 15 mA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210594267.2A CN114879096A (en) | 2022-05-27 | 2022-05-27 | Detection method for abnormal parallel connection of secondary voltage buses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210594267.2A CN114879096A (en) | 2022-05-27 | 2022-05-27 | Detection method for abnormal parallel connection of secondary voltage buses |
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| CN114879096A true CN114879096A (en) | 2022-08-09 |
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| CN202210594267.2A Pending CN114879096A (en) | 2022-05-27 | 2022-05-27 | Detection method for abnormal parallel connection of secondary voltage buses |
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- 2022-05-27 CN CN202210594267.2A patent/CN114879096A/en active Pending
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