CN112858832A - Large-current line selection method based on arc suppression coil grounding system - Google Patents
Large-current line selection method based on arc suppression coil grounding system Download PDFInfo
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- CN112858832A CN112858832A CN201911097343.3A CN201911097343A CN112858832A CN 112858832 A CN112858832 A CN 112858832A CN 201911097343 A CN201911097343 A CN 201911097343A CN 112858832 A CN112858832 A CN 112858832A
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
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Abstract
The invention relates to the technical field of power distribution, in particular to a high-current line selection method based on an arc suppression coil grounding system, which comprises the following steps of S1: a neutral point is arranged in a system with a low-current grounding mode; s2: sequentially connecting the neutral point of the step 1 with the ground, and connecting a grounding transformer, an isolating switch and an arc suppression coil; s3: arranging an on-load switch on the arc suppression coil in the step 2, and dividing the control process into two sections through the on-load switch; the method provided by the invention does not change the original structure of the arc suppression coil protection system in the circuit, does not add an additional control detection device, and quickly changes the working state of the circuit and destroys the resonance frequency in the circuit by quickly adjusting the impedance value of the arc suppression coil so as to achieve the purpose of eliminating the resonance in the circuit in a short time. After the detection stage period is completed, the arc suppression stage is switched back to the arc suppression working state from the line selection state, the original functions of an arc suppression coil protection system are completed, the arc suppression and line selection collineation is realized, the line selection accuracy is improved, and the arc suppression function can be realized.
Description
Technical Field
The invention relates to the technical field of power distribution, in particular to a high-current line selection method based on an arc suppression coil grounding system.
Background
The ground fault line selection technology is a detection technology capable of accurately detecting which loop (a specific line) has a fault when a 3 KV-66 KV neutral point is not grounded or a neutral point is grounded through a resistor and an arc suppression coil in a three-phase alternating current cable system, namely, a detection technology capable of positioning the line with the single-phase ground fault.
In the prior art, the common ground fault line selection technology adopts a low-current ground line selection device and a high-current line selection system, but the two technologies often generate wrong selection and missing selection, and the effect is unsatisfactory, and the reasons are as follows:
(1) the working principle of the traditional small current system is that when a single-phase earth fault occurs, zero sequence current flowing in a fault line is detected through a line zero sequence current transformer (zero sequence CT), the fault zero sequence current is obtained by subtracting earth current from capacitance current of the whole system, and the zero sequence current flowing when the line is normal is only the capacitance current of the line. Whether the ground fault occurs in the line is detected through the difference of the two, so that the line which has the ground fault is positioned, and the method is reliable in principle. However, in an actual circuit, especially in a system in which a neutral point is grounded through an arc suppression coil, the arc suppression coil has the function of reducing the influence of ground current on the circuit when a ground fault occurs by compensating reversed phase current opposite to the phase of the ground current when the circuit has the ground fault, so that grounding arc light is eliminated to protect the circuit, the ground current in the circuit is compensated by the arc suppression coil, and the ground current detected by the zero sequence transformer is very small, so that line selection is inaccurate. The grounding current detected by the zero sequence transformer is too small. Therefore, if the installation position of the zero sequence transformer of the single-phase grounding protection device of the transformer substation and the power plant has large electromagnetic interference, unbalanced load current and large harmonic current, the reversed phase current generated by the grounding fault of the line cannot be detected.
(2) The large-current line selection system is characterized in that a current amplification module is added on the basis of the small-current line selection technology, for example, a resistor which can be put into and taken out is installed in parallel with an arc suppression coil at a neutral point grounding part to serve as the current amplification module, resistive current is bypassed by the arc suppression coil to strengthen reversed-phase current flowing through a zero sequence transformer, detection precision is guaranteed, the resistor is only put into when a fault occurs, and the resistor is taken out after detection is finished, so that the existence time of the resistor is short, the line detection precision is guaranteed, and the power line is not influenced. However, a set of resistance switching control system is connected in parallel to the arc suppression coil system, which causes a complex detection system, namely, a set of detection control system with the same complexity as the arc suppression coil system is installed on the basis of the arc suppression coil system, on one hand, the cost is increased, and the possibility that the fault of the detection system affects the circuit is also increased, for example, when the resistance breaks down, the arc suppression coil is actually completely bypassed, the original arc suppression protection function of the circuit is destroyed, and the fault point is increased. The principle of various current so-called large-current line selection systems is similar to that of the current large-current line selection systems, for example, a thyristor is installed in parallel with an arc suppression coil to serve as a current amplification module in a pulse line selection technology, and a vacuum circuit breaker is installed in parallel with the arc suppression coil to serve as a current amplification module in a maximum line selection technology. These techniques have high line selection accuracy, but have the problem that a fault point is introduced when a self-generated fault occurs.
Disclosure of Invention
The invention aims to provide a high-current line selection method based on an arc suppression coil grounding system.
In order to solve the technical problems, the invention adopts the following technical scheme:
a high-current line selection method based on an arc suppression coil grounding system comprises the following steps
S1: a neutral point is arranged in a system with a low-current grounding mode;
s2: sequentially connecting the neutral point and the ground in the step 1 with a grounding transformer, an isolating switch and an arc suppression coil;
s3: arranging an on-load switch on the arc suppression coil in the step 2, and dividing the control process into two sections through the on-load switch;
s4: in the two stages in the step 3, respectively:
a first stage: when a line has a ground fault, the on-load switch is controlled to adjust the impedance value of the arc suppression coil to control the over-voltage and under-voltage compensation of the arc suppression coil at the line selection stage of the detection fault, and the compensated reverse current of the arc suppression coil when the ground fault occurs is controlled to be far smaller than the ground current, so that the zero sequence transformer can accurately detect the ground current when the line has the ground fault, and the line with the fault can be accurately positioned;
and a second stage: switching from the line selection state back to the arc extinction operating condition after finishing the detection stage, accomplishing the original function of arc suppression coil protection system, tracking trouble ground current size compensation through on-load switch control arc suppression coil falls the trouble ground current to eliminate ground connection arc light and accomplish the circuit protection action, realize the arc extinction and select the line collineation.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a large-current line selection method based on an arc suppression coil grounding system, which does not change the original structure of an arc suppression coil protection system in a circuit and does not add an additional control detection device, quickly changes the working state of the circuit and destroys the resonance frequency in the circuit by quickly adjusting the impedance value of the arc suppression coil so as to achieve the purpose of eliminating the resonance in the circuit in a short time, and further improves the detection accuracy by a zero sequence transformer (zero sequence CT) which prevents the resonance in a detection period from interfering the detection of fault grounding current. After the detection stage period is finished (500 ms), the microcomputer arc extinction \ line selection collinear controller enters an arc extinction stage to be switched back to an arc extinction working state from a line selection state, the original functions of an arc extinction coil protection system are finished, arc extinction and line selection collineation are realized, the line selection accuracy is improved, and the arc extinction function can be realized.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention;
fig. 2 is a schematic diagram of the circuit principle involved in the present invention.
Detailed Description
Referring to the attached drawings 1-2, a high-current line selection method based on an arc suppression coil grounding system comprises the following steps
S1: a neutral point is arranged in a system with a low-current grounding mode;
s2: sequentially connecting the neutral point and the ground in the step 1 with a grounding transformer, an isolating switch and an arc suppression coil;
s3: arranging an on-load switch on the arc suppression coil in the step 2, and dividing the control process into two sections through the on-load switch;
s4: in the two stages in the step 3, respectively:
a first stage: when a line has a ground fault, the on-load switch is controlled to adjust the impedance value of the arc suppression coil to control the over-voltage and under-voltage compensation of the arc suppression coil at the line selection stage of the detection fault, and the compensated reverse current of the arc suppression coil when the ground fault occurs is controlled to be far smaller than the ground current, so that the zero sequence transformer can accurately detect the ground current when the line has the ground fault, and the line with the fault can be accurately positioned;
and a second stage: switching from the line selection state back to the arc extinction operating condition after finishing the detection stage, accomplishing the original function of arc suppression coil protection system, tracking trouble ground current size compensation through on-load switch control arc suppression coil falls the trouble ground current to eliminate ground connection arc light and accomplish the circuit protection action, realize the arc extinction and select the line collineation.
The invention provides a large-current line selection method based on an arc suppression coil grounding system, which does not change the original structure of the arc suppression coil protection system in a circuit and does not add an additional control detection device, and quickly changes the working state of the circuit and destroys the resonance frequency in the circuit by quickly adjusting the impedance value of the arc suppression coil so as to achieve the purpose of eliminating the resonance in the circuit in a short time and prevent the resonance in a detection period from interfering the detection of fault grounding current by a zero sequence transformer (zero sequence CT) so as to further improve the detection accuracy. After the detection stage period is finished (500 ms), the microcomputer arc extinction \ line selection collinear controller enters an arc extinction stage to be switched back to an arc extinction working state from a line selection state, the original functions of an arc extinction coil protection system are finished, arc extinction and line selection collineation are realized, the line selection accuracy is improved, and the arc extinction function can be realized.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention in any way, so that any person skilled in the art can make changes or modifications to the equivalent embodiments using the above disclosure. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are still within the protection scope of the present invention, unless they depart from the technical spirit of the present invention.
Claims (1)
1. A large-current line selection method based on an arc suppression coil grounding system is characterized in that: comprises the following steps
S1: a neutral point is arranged in a system with a low-current grounding mode;
s2: sequentially connecting the neutral point and the ground in the step 1 with a grounding transformer, an isolating switch and an arc suppression coil;
s3: arranging an on-load switch on the arc suppression coil in the step 2, and dividing the control process into two sections through the on-load switch;
s4: in the two stages in the step 3, respectively:
a first stage: when a line has a ground fault, the on-load switch is controlled to adjust the impedance value of the arc suppression coil to control the over-voltage and under-voltage compensation of the arc suppression coil at the line selection stage of the detection fault, and the compensated reverse current of the arc suppression coil when the ground fault occurs is controlled to be far smaller than the ground current, so that the zero sequence transformer can accurately detect the ground current when the line has the ground fault, and the line with the fault can be accurately positioned;
and a second stage: switching from the line selection state back to the arc extinction operating condition after finishing the detection stage, accomplishing the original function of arc suppression coil protection system, tracking trouble ground current size compensation through on-load switch control arc suppression coil falls the trouble ground current to eliminate ground connection arc light and accomplish the circuit protection action, realize the arc extinction and select the line collineation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911097343.3A CN112858832A (en) | 2019-11-12 | 2019-11-12 | Large-current line selection method based on arc suppression coil grounding system |
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| CN201911097343.3A CN112858832A (en) | 2019-11-12 | 2019-11-12 | Large-current line selection method based on arc suppression coil grounding system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116466193A (en) * | 2023-06-19 | 2023-07-21 | 安徽帕维尔智能技术有限公司 | Multi-loop cable fault management and control device |
| CN117424350A (en) * | 2023-12-18 | 2024-01-19 | 安徽凯川电力保护设备有限公司 | Ground connection pulse selection dynamic monitoring controller |
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| EP0083306A1 (en) * | 1981-12-22 | 1983-07-06 | Elektrizitätswerke des Kantons Zürich | Process and device to control at least one compensation coil in a polyphase network |
| CN2109011U (en) * | 1991-10-31 | 1992-07-01 | 上海交通大学 | Automatic tracting compensating petersen device |
| CN103490404A (en) * | 2013-09-11 | 2014-01-01 | 广西电网公司电力科学研究院 | Tuning method of following-setting-type arc suppression coil of power distribution network system and fault line selection method |
| CN103500992A (en) * | 2013-09-11 | 2014-01-08 | 广西电网公司电力科学研究院 | Method for tuning arc suppression coil of power distribution network |
| CN106353642A (en) * | 2016-11-04 | 2017-01-25 | 华北电力大学（保定） | Small current grounded line gating and tuning method based on arc suppression coil access control short time heteromorphic signal |
| CN108089098A (en) * | 2017-12-15 | 2018-05-29 | 梅素真 | A kind of selection method based on arc suppression coil earthing system |
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2019
- 2019-11-12 CN CN201911097343.3A patent/CN112858832A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0083306A1 (en) * | 1981-12-22 | 1983-07-06 | Elektrizitätswerke des Kantons Zürich | Process and device to control at least one compensation coil in a polyphase network |
| CN2109011U (en) * | 1991-10-31 | 1992-07-01 | 上海交通大学 | Automatic tracting compensating petersen device |
| CN103490404A (en) * | 2013-09-11 | 2014-01-01 | 广西电网公司电力科学研究院 | Tuning method of following-setting-type arc suppression coil of power distribution network system and fault line selection method |
| CN103500992A (en) * | 2013-09-11 | 2014-01-08 | 广西电网公司电力科学研究院 | Method for tuning arc suppression coil of power distribution network |
| CN106353642A (en) * | 2016-11-04 | 2017-01-25 | 华北电力大学（保定） | Small current grounded line gating and tuning method based on arc suppression coil access control short time heteromorphic signal |
| CN108089098A (en) * | 2017-12-15 | 2018-05-29 | 梅素真 | A kind of selection method based on arc suppression coil earthing system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116466193A (en) * | 2023-06-19 | 2023-07-21 | 安徽帕维尔智能技术有限公司 | Multi-loop cable fault management and control device |
| CN117424350A (en) * | 2023-12-18 | 2024-01-19 | 安徽凯川电力保护设备有限公司 | Ground connection pulse selection dynamic monitoring controller |
| CN117424350B (en) * | 2023-12-18 | 2024-04-16 | 安徽凯川电力保护设备有限公司 | Ground connection pulse selection dynamic monitoring controller |
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