CN108089098A - A kind of selection method based on arc suppression coil earthing system - Google Patents
A kind of selection method based on arc suppression coil earthing system Download PDFInfo
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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
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Abstract
The invention discloses a kind of selection methods based on arc suppression coil earthing system, when earth fault occurs for earthed system, by adjusting the arc suppression coil compensation gear, the phase place change angle of each outlet zero-sequence current is detected, the circuit according to where the phase place change angle of each outlet zero-sequence current judges earth fault.Root selection method of the present invention judges ground path, can accurately exclude ungrounded circuit, greatly improves the route selection accuracy rate through grounding through arc power distribution network, to improving power distribution network safety operation level important in inhibiting.
Description
Technical Field
The invention relates to the technical field of power distribution network safety, in particular to a line selection method based on an arc suppression coil grounding system.
Background
The vast majority of 6-66kv power distribution networks (hereinafter collectively referred to as power distribution networks) in China adopt a neutral point non-effective grounding mode. With the rapid development of national economy and the continuous increase of the scale of a power distribution network, the application of the arc suppression coil becomes a necessary choice. The national electric power industry standard 'overvoltage protection and insulation coordination of alternating current electrical devices' stipulates that a system formed by overhead lines of 3 kV-10 kV reinforced concrete or metal towers and all 35kV and 66kV systems adopt an arc suppression coil grounding mode when the single-phase grounding fault capacitance current exceeds 10A; a large number of automatic arc suppression coil tracking compensation devices are put into operation, so that the safe operation level and the power supply reliability of a power distribution network are improved powerfully, relevant national departments set corresponding regulations later, a series of production activities of production, handover and commissioning of arc suppression coils are standardized, and the automatic arc suppression coil tracking compensation device plays an important role in large-scale popularization of the arc suppression coils; however, the problem of the power distribution network grounded by the arc suppression coil is more prominent because the fault rate of the line selection device is high; the method for selecting the line of the prior system with no grounding neutral points, such as a zero-sequence current amplitude method, a zero-sequence current phase comparison method, a zero-sequence current group amplitude comparison phase comparison method and a zero-sequence reactive power direction method, can not work correctly in a power distribution network which is grounded through an arc suppression coil. Many factors influencing the correct work of the line selection device exist, many documents make analysis and research, and numerous solutions such as a 5-order harmonic method, a small-current grounding line selection based on transient zero-sequence current comparison, a transient zero-sequence energy method, a line selection technology based on wavelet transformation and a line selection technology based on artificial intelligence are provided, but the line selection accuracy rate is lower than 40% so far, and the line selection method cannot be satisfactory.
Disclosure of Invention
The invention aims to provide a line selection method based on an arc suppression coil grounding system, which is characterized in that when grounding occurs, the compensation gear of the arc suppression coil is properly adjusted, the change condition of the phase of zero sequence current of each outgoing line is detected, and a grounding fault line is judged according to the change condition.
In order to achieve the purpose, the line selection method based on the arc suppression coil grounding system is characterized in that when the grounding system has a ground fault, the phase change angle of each outgoing line zero sequence current is detected by adjusting the compensation gear of the arc suppression coil, and the line where the ground fault is located is judged according to the phase change angle of each outgoing line zero sequence current.
The line selection method based on the arc suppression coil grounding system is characterized in that the line with the largest phase change angle of the zero sequence current of each outgoing line is the line where the grounding fault is located.
Further, in order to achieve the above object, the present invention further provides a line selection method based on an arc suppression coil ground fault line selection device, comprising the following steps:
s10, when the grounding system has a grounding fault, ensuring that the compensation gear of the arc suppression coil is controlled to be an overcompensation gear, and measuring the zero sequence current phase of each outgoing line;
s11, adjusting the arc suppression coil to an under-compensated gear;
s12, measuring the zero sequence current phase of each outgoing line;
and S13, calculating the zero sequence current phase difference of each outgoing line before and after the gear of the arc suppression coil is adjusted after the ground fault occurs, and selecting the line.
In the line selection method of the ground fault line selection apparatus, in step S13, the line with the largest phase difference is a ground fault line.
In the above-mentioned line selection method for the ground fault line selection device, in step S11, when the shift position of the arc suppression coil is adjusted to the under-compensated shift position, the compensation current of the arc suppression coil in the current shift position is simultaneously usedSatisfies the following formula:
wherein,for all outgoing line to earth capacitance currentOf the capacitor current of the largest magnitude,the sum of the capacitance and current of the distribution network system to ground is shown, and n is a natural number.
In the line selection method of the ground fault line selection device, in the step S11, adjusting the arc suppression coil to the under-compensated gear position is to reduce the gear position of the arc suppression coil to a proper gear position for a short time on the basis of a complete compensation gear position on the basis of no change of the ground condition of the distribution network, so that the distribution network system is under-compensated for a short time.
Before step S10, the method for selecting a line by using the ground fault line selection device further includes step S100 of estimating an equivalent capacitance and a capacitive reactance of each outgoing line to ground.
In the line selection method of the ground fault line selection device, a step S101 of circularly detecting and judging whether a ground fault occurs in the system is further included between the steps S100 and S10.
The line selection method of the ground fault line selection device further includes a step S14 of correcting the equivalent capacitance to ground of the non-grounded line after the step S13.
In the above method for selecting a line by using a ground fault line selection apparatus, in step S101, the method further includes:
step S1011 of detecting the current capacitance and current of each line of the system;
adjusting the gear of the arc suppression coil to be controlled at an overcompensation gear S1012 closest to a full compensation gear;
and judging whether a ground fault occurs, executing step S12 when the ground fault occurs, and circularly executing steps S1011 and S1012 when the system operates normally.
In the above-mentioned line selection method for the ground fault line selection apparatus, after the step S14, the step S1011 is executed in a loop manner.
Compared with the prior art, the line selection method based on the arc suppression coil grounding system has the advantages that when grounding occurs, the compensation gear of the arc suppression coil is properly adjusted, the change condition of the phase of the zero sequence current of each outgoing line is detected, the grounding line is judged, the non-grounding line can be accurately eliminated, the line selection accuracy of a power distribution network grounded through the arc suppression coil is greatly improved, and the important significance is realized on the improvement of the safe operation level of the power distribution network.
Drawings
FIG. 1 is a schematic diagram of zero-sequence capacitive current distribution when a distribution network line is grounded;
fig. 2 is a schematic flow chart of an implementation process of the ground fault line selection device based on the method of the present invention.
Detailed Description
The line selection principle and the specific technical scheme of the line selection method based on the arc suppression coil grounding system are described in detail below.
Distribution of zero sequence current when distribution network single-phase grounding
From the angle of eliminating arc light from the ground fault, the arc suppression coil automatic tracking compensation device is required to be capable of accurately measuring the capacitance current of the system and changing the gear or the detuning degree of the arc suppression coil, so that the provided inductance can completely compensate the capacitance current of the system and avoid series resonance; usually the arc suppression coil is in the overcompensation gear closest to the full compensation gear, and the detuning degree is kept at a negative value with a small absolute value. For convenient analysis, assuming that the arc suppression coil can completely compensate the system capacitance and neglecting the distributed inductance and resistance parameters of the line, when the distribution network line is grounded, the zero sequence capacitance current of the power grid is distributed as shown in fig. 1, and there are four outgoing lines in fig. 1: line 1, line 2, line 3, line 4. Wherein,in order to generate the current flowing through the equivalent capacitance of each line to the ground when the ground fault occurs,respectively, zero sequence currents measured at the head ends of the line 1, the line 2, the line 3 and the line 4,the current flowing through the grounding point and the current flowing through the arc suppression coil. It should be noted that, although fig. 1 only shows 4 outgoing lines, the present disclosure is not limited to be only applicable to a power grid with 4 outgoing lines, but is applicable to a power grid with n outgoing lines, where n is a natural number.
Referring to fig. 1, when the arc suppression coil is able to fully compensate the system capacitance, there are:
namely, the zero sequence current is measured at the head end of the non-grounded line and is the capacitance current to the ground of the line.
For the ground line 4:
substituting the formulas (1) and (3) into the formula (4) comprises the following steps:
namely, the zero sequence current is measured at the head end of the grounding circuit, and is the same as the grounding capacitance current of the circuit in the same size and direction.
Namely, when the arc suppression coil can completely compensate the capacitance of the distribution network system, the zero sequence current measured at the first section of all the lines (including the grounding line and the non-grounding line) is equal to the grounding capacitance current of the line in magnitude and same in direction.
(II) line selection principle
Under the condition that the grounding condition of the distribution network is not changed, the gear of the arc suppression coil is reduced to be a proper gear in a short time on the basis of completely compensating the gear, so that the distribution network system is under short-time under-compensation, and meanwhile, the current compensation current of the arc suppression coil under the current gear is compensatedSatisfies the following formula:
wherein,for all outgoing line to earth capacitance currentOf the capacitor current of the largest magnitude,the sum of the capacitance-to-ground current of the distribution network system.
Taking into account critical conditions
At this time, zero sequence current measured at the head end of the non-grounded line, namely, the 1, 2 and 3 lines, is unchanged:
zero sequence current measured at head end of non-grounded line, namely No. 1, 2 and 3 line is not changed
For the earthed line 4, the zero sequence current measured at the first section of the lineComprises the following steps:
(8) the equation transforms into:
substituting formula 6 into
That is, when the expression of the condition (5) is satisfied,andin the reverse direction, that is to say withAndreverse direction
Therefore, before and after the gear shifting according to the formula (5), the magnitude and the direction of the zero sequence current measured at the head end of the non-grounded line are unchanged, while the magnitude and the direction of the zero sequence current measured at the head end of the grounded line are changed by 180 degrees.
Therefore, the change angle of the zero sequence current phase position of the gear and the head end of each line is adjusted according to the formula (5) condition, and the line with the maximum change is the line where the ground fault is positioned
For an actual arc suppression coil controller, during normal operation, the arc suppression coil is usually controlled to be in an overcompensation gear closest to a full compensation gear, and the analysis is still valid.
Although the above analysis is based on shifting the arc suppression coils by turns, other types of arc suppression coils such as: the direct current bias magnetic type, the phase control type, the capacitance adjusting type, the air gap adjusting type and the like are different in implementation mode, the basic principle is that the capacitance current to the ground of the power distribution network is estimated according to respective algorithms, then the inductance is adjusted by different methods, and the analysis is also applicable.
(III) technical implementation
From the above research analysis, referring to fig. 2, a specific embodiment of the ground fault line selection apparatus based on the method of the present invention is further illustrated.
Wherein the step S100 is to estimate the equivalent capacitance C of each circuitiAnd capacitive reactance XCiSo as to obtain the capacitance current with the maximum amplitude of the capacitance current to ground of all outgoing lines in the formula (5)
A common empirical formula is
For overhead lines:
ICi＝10-3*(2.7┄3.3)*li*UX(A) (11)
XCi＝103/(2.7┄3.3)/li/31/2(12)
wherein XCi、liThe capacitive reactance and length of line i are in units of ohm and kilometer, UXThe system line voltage is in units of kilovolts. When the line has a lightning rod or not, the coefficients are 3.3 and 2.7 respectively.
To cable line
ICi＝UX*(95+1.44*Si)*li/(2200+0.23*Si)(A) (13)
XCi＝(95+1.44*Si)*li/(2200+0.23*Si)/31/2(14)
Wherein SiI point force core wire cross section of line
After the initial value is estimated, the capacitive reactance of the non-grounded line is corrected by using the zero sequence voltage and the zero sequence current of the line in the case of the ground fault, as shown in step S14. During normal operation, the device circularly executes step S101, and circularly detects and judges whether a ground fault occurs, that is, circularly detects the current capacitance current of the system between steps S1011 and S1012, tracks the change of the system mode in real time, controls the gear of the arc suppression coil to the overcompensation gear closest to the full compensation gear, and judges whether a ground fault occurs in the system.
After the earth fault occurs, step S10 is performed, the phase of the zero sequence current of each outgoing line is measured first, then step S11 is performed, the shift of the arc suppression coil is adjusted according to formula (5), and the measured system capacitive reactance is set to be X at the momentCLet the minimum capacitive reactance of each outgoing line be Xmin(corresponding to the maximum capacitance current), the inductance L of the arc suppression coil should satisfy:
L＝1.05*XC*Xmin/314.159/(Xmin-XC) (15)
wherein the factor of 1.105 is XminThe reliability factor of (5) ensures that equation (5) holds.
And (5) after the gear of the arc suppression coil is adjusted to the under-compensated gear, performing step S12, measuring the zero sequence current phase of each outgoing line, further calculating the zero sequence current phase difference of each outgoing line before and after gear shifting after the occurrence of the ground fault, and selecting the line according to the phase difference. The line with the largest phase change is a ground fault line.
In conclusion, the line selection method based on the arc suppression coil grounding system provides a new method for comparing the phase change of zero sequence current of front and rear outgoing lines of the shift of the arc suppression coil when a ground fault occurs, judging the line with the maximum phase change as the line where the ground fault is located, and providing a method and a strategy for shifting the shift of the arc suppression coil; analysis shows that the technical theoretical basis is firm; simulation calculation verifies that the method can clearly distinguish the grounding line from the non-grounding line, is not influenced by the grounding point transition resistance, can still accurately select the grounding line under the condition of high-resistance grounding, and overcomes the difficulty of line selection of the grounding fault of the power distribution network grounded through the arc suppression coil.
Although the present invention has been described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (11)
1. A line selection method based on an arc suppression coil grounding system is characterized in that when a grounding system has a ground fault, the phase change angle of zero sequence current of each outgoing line is detected by adjusting a compensation gear of the arc suppression coil, and a line where the ground fault is located is judged according to the phase change angle of the zero sequence current of each outgoing line.
2. A line selection method based on an arc suppression coil grounding system is characterized in that a line with the largest phase change angle of zero-sequence current of each outgoing line is a line where a grounding fault is located.
3. A line selection method based on an arc suppression coil ground fault line selection device is characterized by comprising the following steps:
s10, when the grounding system has a grounding fault, ensuring that the compensation gear of the arc suppression coil is controlled to be an overcompensation gear, and measuring the zero sequence current phase of each outgoing line;
s11, adjusting the arc suppression coil to an under-compensated gear;
s12, measuring the zero sequence current phase of each outgoing line;
and S13, calculating the zero sequence current phase difference of each outgoing line before and after the gear of the arc suppression coil is adjusted after the ground fault occurs, and selecting the line.
4. The line selection method of the ground fault line selection device according to claim 3, characterized in that:
in step S13, the line with the largest phase difference is a ground fault line.
5. The line selection method of the ground fault line selection device according to claim 3 or 4, characterized in that: in step S11, when the shift position of the arc suppression coil is adjusted to the under-compensated shift position, the compensation current of the arc suppression coil is simultaneously applied to the current shift positionSatisfies the following formula:
wherein,for all outgoing line to earth capacitance currentOf the capacitor current of the largest magnitude,the sum of the capacitance and current of the distribution network system to ground is shown, and n is a natural number.
6. The line selection method of the ground fault line selection device according to claim 5, wherein:
in the step S11, the adjustment of the arc suppression coil gear to the under-compensation gear is performed by reducing the gear of the arc suppression coil by a proper gear for a short time on the basis of a complete compensation gear on the basis of no change of the distribution network grounding condition, so that the distribution network system is under-compensated for a short time.
7. The line selection method of the ground fault line selection device according to claim 3, characterized in that: before the step S10, a step S100 of estimating the equivalent capacitance and the capacitive reactance of each outgoing line to ground is further included.
8. The line selection method of the ground fault line selection device according to claim 7, characterized in that: a step S101 of determining whether the system has a ground fault by loop detection is further included between the steps S100 and S10.
9. The line selection method of the ground fault line selection device according to claim 3, characterized in that: after the step S13, the method further includes a step S14 of correcting the equivalent capacitance to ground of the non-grounded line.
10. The line selection method of the ground fault line selection device according to claim 8, wherein: in the step S101, the method further includes:
step S1011 of detecting the current capacitance and current of each line of the system;
adjusting the gear of the arc suppression coil to be controlled at an overcompensation gear S1012 closest to a full compensation gear;
and judging whether a ground fault occurs, executing step S12 when the ground fault occurs, and circularly executing steps S1011 and S1012 when the system operates normally.
11. The line selection method of the ground fault line selection device according to claim 9, characterized in that: after the step S14, the process loops to step S1011.
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Cited By (10)
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| CN108845223A (en) * | 2018-07-11 | 2018-11-20 | 云南电网有限责任公司电力科学研究院 | A kind of arc suppression coil magnetic control disturbance selection method |
| CN109490718A (en) * | 2019-01-18 | 2019-03-19 | 云南电网有限责任公司电力科学研究院 | A kind of earth current based on controllable voltage source compensates selection method entirely |
| CN109507521A (en) * | 2019-01-18 | 2019-03-22 | 云南电网有限责任公司电力科学研究院 | Controllable voltage source earth current compensates the acquisition methods and device of output valve entirely |
| CN109521320A (en) * | 2019-01-30 | 2019-03-26 | 云南电网有限责任公司电力科学研究院 | A kind of controllable voltage source compensates phase perturbation selection method entirely |
| CN109541381A (en) * | 2019-01-30 | 2019-03-29 | 云南电网有限责任公司电力科学研究院 | A kind of controllable voltage source compensates controllable phase variation characteristic selection method entirely |
| CN109541380A (en) * | 2019-01-18 | 2019-03-29 | 云南电网有限责任公司电力科学研究院 | A kind of full compensating disturbance selection method of controllable voltage source earth current and device |
| CN109782115A (en) * | 2019-03-29 | 2019-05-21 | 云南电网有限责任公司电力科学研究院 | A kind of method of discrimination of the full compensation of ground failure vanishes of controllable voltage source |
| CN109782114A (en) * | 2019-03-29 | 2019-05-21 | 云南电网有限责任公司电力科学研究院 | A kind of full compensation of ground malfunction method of discrimination of controllable voltage source and system |
| CN111398733B (en) * | 2020-03-19 | 2021-01-01 | 华中科技大学 | Ocean nuclear power platform power grid ground fault line selection protection method and system |
| CN112858832A (en) * | 2019-11-12 | 2021-05-28 | 安徽帕维尔智能技术有限公司 | Large-current line selection method based on arc suppression coil grounding system |
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| CN108845223A (en) * | 2018-07-11 | 2018-11-20 | 云南电网有限责任公司电力科学研究院 | A kind of arc suppression coil magnetic control disturbance selection method |
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| CN109507521A (en) * | 2019-01-18 | 2019-03-22 | 云南电网有限责任公司电力科学研究院 | Controllable voltage source earth current compensates the acquisition methods and device of output valve entirely |
| CN109541380A (en) * | 2019-01-18 | 2019-03-29 | 云南电网有限责任公司电力科学研究院 | A kind of full compensating disturbance selection method of controllable voltage source earth current and device |
| CN109541380B (en) * | 2019-01-18 | 2020-04-24 | 云南电网有限责任公司电力科学研究院 | Controllable voltage source grounding current full-compensation disturbance line selection method and device |
| CN109521320A (en) * | 2019-01-30 | 2019-03-26 | 云南电网有限责任公司电力科学研究院 | A kind of controllable voltage source compensates phase perturbation selection method entirely |
| CN109541381A (en) * | 2019-01-30 | 2019-03-29 | 云南电网有限责任公司电力科学研究院 | A kind of controllable voltage source compensates controllable phase variation characteristic selection method entirely |
| CN109782115A (en) * | 2019-03-29 | 2019-05-21 | 云南电网有限责任公司电力科学研究院 | A kind of method of discrimination of the full compensation of ground failure vanishes of controllable voltage source |
| CN109782114A (en) * | 2019-03-29 | 2019-05-21 | 云南电网有限责任公司电力科学研究院 | A kind of full compensation of ground malfunction method of discrimination of controllable voltage source and system |
| CN109782115B (en) * | 2019-03-29 | 2020-03-10 | 云南电网有限责任公司电力科学研究院 | Method for judging disappearance of full-compensation ground fault of controllable voltage source |
| CN112858832A (en) * | 2019-11-12 | 2021-05-28 | 安徽帕维尔智能技术有限公司 | Large-current line selection method based on arc suppression coil grounding system |
| CN111398733B (en) * | 2020-03-19 | 2021-01-01 | 华中科技大学 | Ocean nuclear power platform power grid ground fault line selection protection method and system |
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Application publication date: 20180529 |