CN109494703B - Active intervention type safety arc extinction method based on compensation damping mode - Google Patents
Active intervention type safety arc extinction method based on compensation damping mode Download PDFInfo
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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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- 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
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
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Abstract
The invention relates to an active intervention type safety arc extinction method based on a compensation damping mode. The stable single-phase earth fault can be quickly judged by comparing the detection and the comparison of the compensation branch current. The method for changing the resistance of the compensation damping branch circuit solves the problem of differential judgment of the grounding line selection sensitivity and the fault property of high-resistance grounding.
Description
Technical Field
The invention belongs to the field of rapid judgment and processing of the fault property of single-phase grounding of a power distribution network, and is mainly used for active intervention safety arc suppression device fault processing in a power distribution network fault phase grounding arc suppression mode.
Background
The active intervention safety arc extinction device is based on a neutral point ungrounded power grid, the neutral point ungrounded power grid frequently generates various internal overvoltage, particularly ferromagnetic resonance overvoltage of the electromagnetic voltage transformer frequently occurs, and the operating overvoltage generated in the action process of the device is used as a disturbance factor to excite the ferromagnetic resonance of the electromagnetic voltage transformer to influence the judgment of the device and the safety of the power grid. It has been proven that some products cause multiple PT resonances in the complex station during the product validation test in 2017. So that some products put special requirements on the harmonic elimination measures of the voltage transformers of the experimental plant or the substation during the test, which actually requires the power grid to meet the products of the adaptive manufacturer, but does not require the products of the manufacturer to meet the adaptive power grid, which is not suitable. In addition, in the distribution network neutral point ungrounded mode, the mode of grounding through an arc suppression coil and the mode of grounding through a resistor, the internal overvoltage level of the neutral point ungrounded mode is the highest. If the active intervention type safety arc-extinguishing device is to be popularized in the power grid, the internal overvoltage problem, especially the ferromagnetic resonance overvoltage protection problem, must be solved.
Disclosure of Invention
Aiming at the problems, the invention provides an active intervention type safety arc extinction method based on a compensation damping mode. During normal operation, QF1 is switched on, QF2 is switched off, and the device operates in a medium resistance grounding state to damp internal overvoltage of the power distribution network. This approach is very effective for internal overvoltage protection, especially for preventing ferromagnetic resonance of electromagnetic voltage transformers. Because the damping resistor and the exciting impedance of the electromagnetic voltage transformer are connected in parallel in the zero-sequence loop, the resistance value of the resistor is 500-1000 omega, the exciting impedance of the electromagnetic voltage transformer is dozens of k omega, which is different by several orders of magnitude, and the electromagnetic voltage transformer cannot resonate at all under the restriction of the damping resistor, the compensation damping type active intervention safety arc-extinguishing device does not need to provide any requirement for the harmonic elimination measure of a transformer substation, and the ferromagnetic resonance overvoltage caused by the electromagnetic voltage transformer cannot occur.
Because the existence of the compensation damping resistor changes the power grid from a neutral point ungrounded mode into a medium resistance grounded mode, the internal overvoltage of arc grounding overvoltage, operation overvoltage and the like of the power grid can be effectively limited, and the safety of the power grid is ensured.
the active dry-pre type safety arc suppression device based on the compensation damping mode is composed of a grounding transformer JDB, a front breaker QF0, a three-phase voltage transformer TV1, a neutral point voltage transformer TV2, a compensation damping branch switching switch QF1, damping resistors R1 and R2, a damping resistor change-over switch QF2, a compensation damping branch current transformer TA1, fault connection grounding switches QFA, QFB and QFC, a transfer grounding current transformer TA2, a device control system and zero sequence current transformers installed on all feeders. The device is in QF1 closing state and QF2 disconnection when the distribution network normally operates, and the device operates in the medium resistance grounding state to damp the internal overvoltage of the distribution network. When a permanent single-phase earth fault occurs in the power distribution network and the fault line cannot be cut off for a long time, the QF1 is disconnected and the compensation damping resistor is withdrawn. When the grounding fault disappears and the device is reset, the QF1 is switched on, the compensation damping branch is put into the compensation damping branch, the compensation damping branch operates in a medium resistance grounding state, and the internal overvoltage of the power distribution network is damped.
When the neutral point displacement voltage UN of the power distribution network in the time period delta T1 stably reaches a fixed value delta UN which is not less than delta, the increment delta IB of the compensation damping branch current IB is not less than eta, and the increment delta I0icos phi of the resistive component of the zero sequence current of any feeder line is not less than eta, the power distribution network is judged to have a stable single-phase earth fault, otherwise, the power distribution network is an unstable single-phase earth fault. Delta is an increment constant value of neutral point displacement voltage of the power distribution network, I eta is an increment constant value of compensating damping branch circuit current, I beta is an increment constant value of a resistive component of zero-sequence current of the feeder line, delta T1 is a time period for judging stable grounding, and phi is a phase angle of neutral point displacement voltage UN and the zero-sequence current I0I of the feeder line.
After the power distribution network is judged to have a stable single-phase earth fault, fault partitioning is carried out according to the neutral point displacement voltage UN, when UN is more than or equal to UL, the low-resistance earth fault is obtained, UN < UL is high-resistance earth fault, and UL is a boundary value of the low-resistance earth and high-resistance earth neutral point displacement voltage. For the low-resistance grounding fault, the feeder line with the largest zero-sequence current is selected as the line generating single-phase grounding by collecting the zero-sequence current value of each feeder line and using a zero-sequence current ratio radiation method. For a high-resistance grounding fault, particularly a high-resistance grounding fault of an asymmetric power distribution network, QF2 is switched on, the resistance in a compensation damping branch route is changed into low resistance, large compensation resistive current is provided for a fault loop, and a feeder line with the largest increment delta Imax0icos phi of the resistive component of zero sequence current in each feeder line is detected as a grounding fault feeder line.
After the stable single-phase earth fault of the power distribution network is judged, an earth fault phase is selected by adopting a partition type phase selection method, a fault phase earth switch is switched on to the earth after an earth fault line is selected, the fault current is transferred, the potential of a fault point is clamped, and arc extinction processing is carried out on the fault.
After the earth switch of the fault phase earth switch is switched on for delta T2, the fault phase earth switch is disconnected, the fault property is judged, for the low-resistance earth fault, the fault property is judged by comparing the neutral point displacement voltage UN with the standard value UH of the fault recovery voltage, if UN < UH, the fault is instantaneous fault and the fault is recovered, the device is reset; if UN is more than or equal to UH, the fault is a permanent fault; judging a high-resistance earth fault by a method of comparing the increment of the zero sequence current resistive component of an earth fault feeder line, if the increment of the zero sequence current resistive component of the earth fault feeder line is delta Imax0icos phi < IH, the earth fault is an instantaneous earth fault, the fault is recovered, and the device is reset; if the zero sequence current resistive component increment delta Imax0icos phi of the grounding fault feeder line is larger than or equal to IH, the grounding fault feeder line is a permanent grounding fault.
Judging the fault property of the high-resistance ground fault by comparing the change of the current of the compensation branch circuit before and after the fault, if the current of the compensation branch circuit before the ground fault is IB0, the current of the compensation branch circuit after the ground fault is IBG, and if the current IB of the compensation branch circuit after the fault is switched off relative to the ground is less than fIB0, the fault is an instantaneous ground fault, the fault is recovered, and the device is reset; if IB is larger than or equal to fIB0, the fault is a permanent fault, and f is the current coefficient of the current of the compensation branch circuit, and is 1.1-1.3.
After the permanent earth fault of the power distribution network is judged, a trip can be immediately sent out to remove the fault feeder line to realize the rapid isolation of the fault, and the device is reset after the permanent earth fault is removed and the fault characteristic signal disappears; if the power distribution network does not allow the fault feeder line to be cut off immediately, the fault earth switch is switched on again immediately, the potential of the clamped fault point is low, and the device is reset after a reset instruction is received after the fault is processed.
the compensation damping branch R1 and the compensation damping branch R2 are connected in series to form a middle resistor, the resistance value after the series connection meets the requirements of the ferromagnetic resonance overvoltage and the operation overvoltage of the damping power distribution network, generally 500-800 omega, R2 is a low resistor, generally 50-100 omega, the through-current capacity of the resistor is calculated according to the property of grounding, and the through-current time is calculated according to the first earth closing time of a fault phase switch.
The invention has the following advantages:
1. The invention converts the non-grounding mode of the neutral point into the grounding mode through the middle resistor by the compensation damping branch, realizes effective internal overvoltage protection, and completely prevents the damage of internal overvoltage such as ferromagnetic resonance overvoltage, operation overvoltage and the like to the power grid.
2. The invention can quickly eliminate the non-single-phase earth fault through the detection of the compensation current of the compensation damping branch, can quickly diagnose the fault type, prevent error processing and prevent the occurrence of the accident endangering the power grid.
3. The invention can effectively solve the problem of grounding line selection sensitivity when high-resistance grounding, in particular to the high-resistance grounding fault of an asymmetric power distribution network, through a method for detecting and comparing the compensation current of the compensation damping branch.
4. The invention can effectively solve the problem of fault property judgment when the high-resistance grounding of the asymmetric distribution network, in particular to the high-resistance grounding fault through the method for detecting and comparing the compensation current of the compensation damping branch.
drawings
Fig. 1 is a device configuration diagram, and the device configuration diagram is composed of a grounding transformer JDB, a front breaker QF0, a three-phase voltage transformer TV1, a neutral point voltage transformer TV2, a compensation damping branch switching switch QF1, damping resistors R1 and R2, a damping resistor change-over switch QF2, a compensation damping branch current transformer TA1, fault phase grounding switches QFa, QFb and QFc, a transfer grounding current transformer TA2, a device control system, and zero sequence current transformers installed on each feeder line.
Detailed Description
The device is in QF1 closing state and QF2 disconnection when the distribution network normally operates, and the device operates in the medium resistance grounding state to damp the internal overvoltage of the distribution network. When a permanent single-phase earth fault occurs in the power distribution network and a fault line cannot be cut off for a long time, the QF1 is disconnected and the compensation damping resistor is withdrawn, when the earth fault disappears and the device is reset, the QF1 is switched on, the compensation damping branch is put into the compensation damping branch, the compensation damping branch operates in a medium resistor grounding state, and the internal overvoltage of the power distribution network is damped.
When the neutral point displacement voltage UN of the power distribution network in a time period delta T1 stably reaches a fixed value delta UN which is not less than delta, the increment delta IB of the compensation damping branch current IB is not less than eta, and the increment delta I0icos phi of the resistive component of the zero sequence current of any feeder line is not less than eta, the power distribution network is judged to have a stable single-phase earth fault, otherwise, the power distribution network is an unstable single-phase earth fault; delta is an increment constant value of neutral point displacement voltage of the power distribution network, I eta is an increment constant value of compensating damping branch circuit current, I beta is an increment constant value of a resistive component of zero-sequence current of the feeder line, delta T1 is a time period for judging stable grounding, and phi is a phase angle of neutral point displacement voltage UN and the zero-sequence current I0I of the feeder line.
after the power distribution network is judged to have a stable single-phase earth fault, fault partitioning is carried out according to neutral point displacement voltage UN, when UN is more than or equal to UL, the low-resistance earth fault is obtained, UN < UL is high-resistance earth fault, and UL is a boundary value of the low-resistance earth and high-resistance earth neutral point displacement voltage; for the low-resistance grounding fault, selecting the feeder line with the largest zero-sequence current as a line generating single-phase grounding by acquiring the zero-sequence current value of each feeder line and using a zero-sequence current ratio radiation method; for a high-resistance grounding fault, particularly a high-resistance grounding fault of an asymmetric power distribution network, QF2 is switched on, the resistance in a compensation damping branch route is changed into low resistance, large compensation resistive current is provided for a fault loop, and a feeder line with the largest increment delta Imax0icos phi of the resistive component of zero sequence current in each feeder line is detected as a grounding fault feeder line.
after the stable single-phase earth fault of the power distribution network is judged, an earth fault phase is selected by adopting a partition type phase selection method, a fault phase earth switch is switched on to the earth after an earth fault line is selected, the fault current is transferred, the potential of a fault point is clamped, and arc extinction processing is carried out on the fault.
after the earth switch of the fault phase earth switch is switched on for delta T2, the fault phase earth switch is disconnected, the fault property is judged, for the low-resistance earth fault, the fault property is judged by comparing the neutral point displacement voltage UN with the standard value UH of the fault recovery voltage, if UN < UH, the fault is instantaneous fault and the fault is recovered, the device is reset; if UN is more than or equal to UH, the fault is a permanent fault; judging a high-resistance earth fault by a method of comparing the increment of the zero sequence current resistive component of an earth fault feeder line, if the increment of the zero sequence current resistive component of the earth fault feeder line is delta Imax0icos phi < IH, the earth fault is an instantaneous earth fault, the fault is recovered, and the device is reset; if the zero sequence current resistive component increment delta Imax0icos phi of the grounding fault feeder line is larger than or equal to IH, the grounding fault feeder line is a permanent grounding fault.
The high-resistance earth fault can also be judged by comparing the change of the current of the compensating branch circuit before and after the fault, if the current of the compensating branch circuit before the earth fault is IB0, the current of the compensating branch circuit after the earth fault is IBG, and the current IB < fIB0 of the compensating branch circuit after the fault is switched off relative to the earth, the fault is an instantaneous earth fault, the fault is recovered, and the device is reset; if IB is larger than or equal to fIB0, the fault is a permanent fault, and f is the current coefficient of the current of the compensation branch circuit, and is 1.1-1.3.
After the permanent earth fault of the power distribution network is judged, a trip can be immediately sent out to remove the fault feeder line to realize the rapid isolation of the fault, and the device is reset after the permanent earth fault is removed and the fault characteristic signal disappears; if the power distribution network does not allow the fault feeder line to be cut off immediately, the fault earth switch is switched on again immediately, the potential of the clamped fault point is low, and the device is reset after a reset instruction is received after the fault is processed.
The compensation damping branch R1 and the compensation damping branch R2 are connected in series to form a middle resistor, the resistance value after the series connection meets the requirements of the ferromagnetic resonance overvoltage and the operation overvoltage of the damping power distribution network, the resistance value is 500-800 omega, the resistance value R2 is a low resistance and is 50-100 omega, the through-current capacity of the resistor is calculated when the resistance is grounded according to the gold property, and the through-current time is calculated according to the first earth closing time of a fault phase switch.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that several modifications and adaptations to those skilled in the art without departing from the principles of the present invention should also be considered within the scope of the present invention.
Claims (2)
1. An active intervention type security arc extinction method based on a compensation damping mode is composed of a grounding transformer JDB, a front breaker QF0, a three-phase voltage transformer TV1, a neutral point voltage transformer TV2, a compensation damping branch switching switch QF1, damping resistors R1 and R2, a damping resistor change-over switch QF2, a compensation damping branch current transformer TA1, fault phase grounding switches QFA, QFB, QFC, a transfer grounding current transformer TA2, a device control system and zero sequence current transformers arranged on all feeders, and is characterized in that: the device is in a QF1 switch-on state and a QF2 switch-off state when the power distribution network normally operates, and the device operates in a medium resistance grounding state to damp the internal overvoltage of the power distribution network; when a permanent single-phase earth fault occurs in the power distribution network and a fault line cannot be cut off for a long time, the QF1 is disconnected and the compensation damping resistor is withdrawn; when the ground fault disappears and the device is reset, the QF1 is switched on, a compensation damping branch is put into the device, the device operates in a medium resistance grounding state, and the internal overvoltage of the power distribution network is damped;
When the neutral point displacement voltage UN of the power distribution network in a time period delta T1 stably reaches a fixed value delta UN which is not less than delta, the increment delta IB of the compensation damping branch current IB is not less than eta, and the increment delta I0icos phi of the resistive component of the zero sequence current of any feeder line is not less than eta, the power distribution network is judged to have a stable single-phase earth fault, otherwise, the power distribution network is an unstable single-phase earth fault; delta is an increment constant value of neutral point displacement voltage of the power distribution network, I eta is an increment constant value of compensating damping branch circuit current, I beta is an increment constant value of a resistive component of zero-sequence current of the feeder line, delta T1 is a time period for judging stable grounding, and phi is a phase angle of neutral point displacement voltage UN and the zero-sequence current I0I of the feeder line;
After the power distribution network is judged to have a stable single-phase earth fault, fault partitioning is carried out according to neutral point displacement voltage UN, when UN is more than or equal to UL, the low-resistance earth fault is obtained, UN < UL is high-resistance earth fault, and UL is a boundary value of the low-resistance earth and high-resistance earth neutral point displacement voltage; for the low-resistance grounding fault, selecting the feeder line with the largest zero-sequence current as a line generating single-phase grounding by acquiring the zero-sequence current value of each feeder line and using a zero-sequence current ratio radiation method; for a high-resistance ground fault, switching on QF2, changing the resistance in a compensation damping branch route into low resistance, providing larger compensation resistive current for a fault loop, and detecting the feeder line with the largest increment delta Imax0icos phi of the resistive component of the zero-sequence current in each feeder line as a ground fault feeder line;
After the stable single-phase earth fault of the power distribution network is judged, an earth fault phase is selected by adopting a partition type phase selection method, a fault phase earth switch is switched on to the earth after an earth fault line is selected, the fault current is transferred, the potential of a fault point is clamped, and arc extinction processing is carried out on the fault;
After the earth switch of the fault phase earth switch is switched on for delta T2, the fault phase earth switch is disconnected, the fault property is judged, for the low-resistance earth fault, the fault property is judged by comparing the neutral point displacement voltage UN with the standard value UH of the fault recovery voltage, if UN < UH, the fault is instantaneous fault and the fault is recovered, the device is reset; if UN is more than or equal to UH, the fault is a permanent fault; judging a high-resistance earth fault by a method of comparing the increment of the zero sequence current resistive component of an earth fault feeder line, if the increment of the zero sequence current resistive component of the earth fault feeder line is delta Imax0icos phi < IH, the earth fault is an instantaneous earth fault, the fault is recovered, and the device is reset; if the zero sequence current resistive component increment delta Imax0icos phi of the grounding fault feeder line is larger than or equal to IH, the grounding fault is a permanent grounding fault;
Judging the fault property of the high-resistance ground fault by comparing the change of the current of the compensation branch circuit before and after the fault, if the current of the compensation branch circuit before the ground fault is IB0, the current of the compensation branch circuit after the ground fault is IBG, and if the current IB of the compensation branch circuit after the fault is switched off relative to the ground is less than fIB0, the fault is an instantaneous ground fault, the fault is recovered, and the device is reset; if IB is more than or equal to fIB0, the fault is a permanent fault, f is the current coefficient of the current of the compensation branch, and 1.1-1.3 is selected;
After the permanent earth fault of the power distribution network is judged, a trip is immediately sent out to remove the fault feeder line to realize the rapid isolation of the fault, and the device is reset after the permanent earth fault is removed and the fault characteristic signal disappears; if the power distribution network does not allow the fault feeder line to be cut off immediately, the fault earth switch is switched on again immediately, the potential of the clamped fault point is low, and the device is reset after a reset instruction is received after the fault is processed.
2. The active intervention type crowbar extinguishing method based on the compensation damping mode as claimed in claim 1, wherein: the compensation damping branch circuit R1 and the compensation damping branch circuit R2 are connected in series to form a medium resistor, the resistance value after the series connection is required to meet the requirements of ferromagnetic resonance overvoltage and operation overvoltage of a damping power distribution network, the through-current capacity of the resistor is calculated according to the gold property grounding, and the through-current time is calculated according to the first ground closing time of a fault phase switch.
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| CN112054487B (en) * | 2019-06-05 | 2022-05-03 | 李景禄 | Single-phase earth fault judgment and processing method for direct-distribution new energy power plant |
| CN112332380B (en) * | 2019-07-19 | 2022-05-24 | 李景禄 | Intelligent judgment and processing method for multiple earth faults of power distribution network |
| CN112332397A (en) * | 2019-08-01 | 2021-02-05 | 李景禄 | Parallel ground fault processing method for arc suppression coil and active intervention arc suppression device |
| CN112666421A (en) * | 2019-10-16 | 2021-04-16 | 李景禄 | Fault area isolation method based on compensation damping type active intervention arc suppression device |
| CN110888018A (en) * | 2019-11-11 | 2020-03-17 | 国网河南省电力公司漯河供电公司 | Asymmetric power grid high-resistance grounding line selection method based on resistive current comparison method |
| CN110896214B (en) * | 2019-12-02 | 2021-02-12 | 国网河南省电力公司电力科学研究院 | Phase selection method of active intervention type arc suppression device |
| CN112103934A (en) * | 2020-08-19 | 2020-12-18 | 许继电气股份有限公司 | Resistor switching device and method in low-current line selection parallel connection |
| CN113253060B (en) * | 2021-06-24 | 2022-04-26 | 国网河南省电力公司电力科学研究院 | Fault diagnosis method and system considering action influence of active intervention type arc suppression device |
| CN114465210B (en) * | 2022-01-28 | 2022-11-22 | 河海大学 | Power distribution network fault arc extinction and feeder line protection device and method based on line voltage series modulation damping grounding |
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| CN105826911A (en) * | 2016-05-12 | 2016-08-03 | 安徽尚途电力保护设备有限公司 | Middle and high voltage power grid arc extinction protective device, and control method thereof |
| CN107565539B (en) * | 2016-06-30 | 2019-06-21 | 国网北京市电力公司 | A kind of AC/DC mixed power system and DC side fault protecting method |
| CN108008244B (en) * | 2017-10-25 | 2019-07-26 | 国网湖北省电力公司电力科学研究院 | A kind of small current grounding fault progressive classifying identification method at many levels |
| CN108321779B (en) * | 2018-03-12 | 2019-07-05 | 李景禄 | A kind of ground fault Intelligent treatment method of Modes for Neutral |
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Effective date of registration: 20220725 Address after: 410011 No.204, building 9, phase IV 188, middle environmental protection road, Yuhua District, Changsha City, Hunan Province Patentee after: CHANGSHA XINCHANG ELECTRIC POWER SCIENCE & TECHNOLOGY Co.,Ltd. Address before: 410076 Room 302, building 22, West District, Changsha University of technology, 45 Chiling Road, Tianxin District, Changsha City, Hunan Province Patentee before: Li Jinglu |