CN112332397A - Parallel ground fault processing method for arc suppression coil and active intervention arc suppression device - Google Patents
Parallel ground fault processing method for arc suppression coil and active intervention arc suppression device 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
Abstract
The invention relates to an active intervention type safety arc extinction method based on a compensation damping mode. 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 processing grounding faults of parallel connection of an arc suppression coil and an active intervention type arc suppression device of the power distribution network.
Background
The arc suppression coil, especially the automatic tracking compensation arc suppression coil, is the main grounding mode of the neutral point of the power distribution network in China, but the arc suppression coil has many problems in the aspects of grounding line selection, fault identification and personal safety, and the active intervention safety arc suppression device has specific advantages in the aspects and is applied. However, arc suppression coils in power grids in China are widely applied, and a transformer substation is provided with a plurality of sections of buses, so that an active intervention safety arc suppression device is installed on a certain section of bus of the transformer substation, but the other bus is an arc suppression coil, so that the active intervention safety arc suppression device is required to be capable of operating independently and also be capable of operating in parallel with the arc suppression coil. The active interference arc suppression device is based on a neutral point ungrounded power grid, the grounding line selection of the active interference arc suppression device is mainly a zero sequence current method, an arc suppression coil grounding mode is adopted, when a single-phase grounding fault occurs, the zero sequence current flowing through a fault circuit is residual current compensated by the arc suppression coil, the zero sequence current flowing through a non-fault circuit is capacitance current to the ground of the circuit, the zero sequence current is influenced by the tuning difference of the arc suppression coil and the capacitance current difference of each circuit, the zero sequence current of the fault circuit and the zero sequence current of the non-fault circuit have no obvious regularity, the fault circuit cannot be determined by adopting the zero sequence current method, and the maximum technical problem existing in the arc suppression coil grounding mode is also. The zero sequence current line selection method is the most reliable grounding line selection method and is also the main grounding line selection method of the active intervention arc suppression device, so that the maximum technical problem of the parallel operation of the active intervention arc suppression device and the arc suppression coil is caused.
Disclosure of Invention
Aiming at the problems, the invention provides a method for processing the grounding fault by connecting an arc suppression coil and an active interference arc suppression device in parallel, wherein the arc suppression coil is a preset automatic tracking compensation arc suppression device, the active interference arc suppression device is a compensation damping type active interference arc suppression device with a compensation damping branch circuit, and the device comprises a grounding transformer JDB and a neutral point voltage transformer TV0QF switch for compensating damping branch1Damping resistor R1And R2Damping resistance change-over switch QF2 and compensation damping branch current transformer TA1QF switch connected to ground by fault phasea、QFb、QFcMutual inductor T for transferring grounding currentA2And a device control system. The arc suppression coil complete device and the active intervention arc suppression device are connected through a switch QFfThe switching-on and switching-off of the switch can realize independent operation or parallel operation. When QFfThe complete equipment of the closing and arc suppression coil is connected with the active interference arc suppression device in parallel, and the active interference arc suppression device acquires QFfSwitching to a parallel run sequence, QF, after a switch-on position signal2Conversion of compensation resistor of arc-extinguishing device into low resistance QF1When the power grid is disconnected, the power grid normally runs in a preset arc suppression coil grounding mode, and the active intervention arc suppression device acquires the three-phase voltage U of the power grida、Ub、UcNeutral point voltage U of power gridNAnd simultaneously, zero sequence current of a bus feeder line of an arc suppression coil installation section and zero sequence current of a bus feeder line of the active interference arc suppression device are adopted.
When the grid is in time period delta T1Internal grid neutral point displacement voltage UNSteady increment of (delta) UNDelta stable increment delta I of zero sequence current of any feeder line, wherein delta is larger than or equal to delta0i≥IβWhen the fault occurs, the power distribution network is judged to have a stable single-phase earth fault, otherwise, the fault is unstableGrounding, changing the operation mode of the power grid and disturbance of the card-to-cost; delta is the increment standard value of the power grid neutral point displacement voltage, IβIs a stable increment standard value, delta T, of zero sequence current of the feeder line1To determine the time period of stable grounding.
After the stable single-phase earth fault of the power distribution network is judged, the time delay delta T is carried out2Checking the neutral point displacement voltage U of the power gridNWhether delta of (d) still satisfies delta UNWhether the zero-sequence current increment of the feeder line still meets delta I or not0i≥IβIf the two are not satisfied, the arc suppression coil successfully suppresses the arc; if the power grid neutral point shifts voltage UNIs increased by an amount satisfying Δ UNNot less than delta, but zero sequence current increment delta I of the feed line0i<IβTime-of-day, power grid neutral point displacement voltage UNThe increment of the voltage is new power grid neutral point displacement voltage U caused by induction adjustment after the fault of the arc suppression coilNIn a new stable state, the arc suppression coil successfully suppresses the arc, and the device is reset; if the zero sequence current increment of the feeder line is delta I0i≥IβWhen the arc suppression coil is not successfully arc-suppressed, the permanent single-phase earth fault occurs in the card-to-grid power distribution network, the earth fault phase is selected by adopting a partition type phase selection method, and the compensation damping branch switch QF of the device is closed1Inputting damping resistance, detecting compensating damping branch current IRBAnd increment fixed value of resistive component of zero sequence current in each feeder line, at the moment, the stable increment fixed value delta I of the resistive component of the zero sequence current in the feeder lineR0=IRBThe feeder line is a grounding fault feeder line, delta T2And eliminating the transient fault time for the arc suppression coil.
After a stable single-phase earth fault of the power distribution network is judged to select an earth fault phase and an earth line, the earth switch of the fault phase is switched on to the ground, fault current is transferred, fault point potential is clamped, arc extinction processing is carried out on the fault again, and meanwhile, the compensation damping branch switch QF is switched off1。
When the fault phase is connected with the ground switch, the ground switch-on time reaches delta T3Then, a fault phase-to-ground switch is disconnected, and fault property judgment is carried out by adopting a differential fault property judgment method; delta T3For transferring switch to ground for active intervention type arc suppression deviceClosing time.
After the permanent earth fault of the power distribution network is judged, a tripping command is sent immediately, the fault feeder is cut off to realize the rapid isolation of the fault, and the device is reset after the permanent earth fault is cut off and the fault characteristic signal disappears; if the power distribution network does not allow to cut off the fault feeder line immediately, the fault phase-to-ground switch is switched on again, 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.
When QFfThe complete device of the opening and arc suppression coil and the active interference arc suppression device run independently, and the active interference arc suppression device acquires QFfAfter the brake separating position signal is sent, the operation is switched to an independent operation program, and QF of the arc extinction device is actively interfered2Disconnected, QF1Switching on, actively intervening the arc suppression device in the middle resistance grounding state, and collecting three-phase voltage and neutral point voltage U of the power grid during the active intervening of the arc suppression deviceNAnd only zero sequence current of each feeder line of a bus where the active interference arc suppression device is located is collected, the power grid respectively operates in an arc suppression coil grounding mode and an intermediate resistance grounding mode of the active interference arc suppression device, and two different grounding fault processing modes are used for carrying out fault processing.
The arc suppression coil complete device and the active intervention arc suppression device are connected through a switch QFfThe switch is a bus tie switch or a section switch of a substation.
The partition type phase selection method is a ground fault phase selection method which is adopted for fault partition according to the magnitude of the neutral point displacement voltage and according to the distribution rule of fault phases of different partitions. The differential fault property judgment method is a fault property judgment method adopted according to different ground fault characteristics after the phase transfer switch of the fault is switched off to the ground.
ΔT1In order to judge the time period of stable grounding, the time period is more than the measurement and inductance adjustment time of the arc suppression coil; delta T2The time for eliminating the transient fault for the arc suppression coil can be obtained through tests; delta T3The switching-on time of the switch to the ground is transferred for the active intervention type arc suppression device, and is set according to the requirements of personal safety and power supply reliability.
Delta is neutral in distribution networkThe increment standard value of the point displacement voltage is selected according to the working sensitivity of the active interference arc suppression device and is larger than the fluctuation value of the power grid neutral point displacement voltage; i isβThe stable increment standard value of the zero sequence current of the feeder line is selected according to the detection sensitivity of the zero sequence current and is larger than the asymmetric leakage current value of the power grid.
The invention has the following advantages:
1. the invention fully exerts the advantage that the arc suppression coil eliminates the transient grounding fault and improves the power supply reliability of the power grid.
2. The invention solves the problem that the ground fault property identification and arc extinction success are not realized when the arc extinction coil and the active intervention type arc extinction device are operated in parallel.
3. According to the invention, the method for detecting the relation between the resistive current increment in the feeder line and the resistive current of the compensation damping branch circuit by putting the low resistance of the compensation damping branch circuit is adopted, so that the influence on grounding and line selection when the arc suppression coil operates is solved, and the accuracy of grounding and line selection is improved.
Drawings
Fig. 1 is a structural diagram of a compensation damping type active intervention arc suppression device.
Fig. 2 is a wiring diagram of the arc suppression coil and the active interference arc suppression device connected to the power grid.
Detailed Description
The arc suppression coil adopts a preset automatic tracking compensation arc suppression device, the active intervention arc suppression device is a compensation damping type active intervention arc suppression device with a compensation damping branch circuit, and the device comprises a grounding transformer JDB and a power grid neutral point voltage transformer TV0QF switch for compensating damping branch1Damping resistor R1And R2Damping resistance change-over switch QF2 and compensation damping branch current transformer TA1QF switch connected to ground by fault phasea、QFb、QFcMutual inductor T for transferring grounding currentA2And a device control system, wherein the device has two programs of independent operation and parallel operation, and is controlled by a switch QFfThe switching-off and switching-on position signals are switched.
Arc suppression coil complete device and active interference suppressionThe arc device passes through the bus tie switch QFfThe switching-on and switching-off of the switch can realize independent operation or parallel operation. When QFfThe complete equipment of the closing and arc suppression coil is connected with the active interference arc suppression device in parallel, and the active interference arc suppression device acquires QFfSwitching to a parallel run sequence, QF, after a switch-on position signal2Switching on, conversion of compensation resistance to low resistance, QF1When the power grid is disconnected, the power grid normally runs in a preset arc suppression coil grounding mode, and the active intervention arc suppression device acquires the three-phase voltage U of the power grida、Ub、UcNeutral point voltage U of power gridNAnd simultaneously, zero sequence current of a bus feeder line of an arc suppression coil installation section and zero sequence current of a bus feeder line of the active interference arc suppression device are adopted.
When the grid is in time period delta T1Internal grid neutral point displacement voltage UNSteady increment of (delta) UNDelta stable increment delta I of zero sequence current of any feeder line, wherein delta is larger than or equal to delta0i≥IβAnd judging that the power distribution network has a stable single-phase earth fault, or else, the power distribution network is unstable earthed and the operation mode of the power distribution network changes the disturbance of the card-to-card. Delta is the increment standard value of the power grid neutral point displacement voltage, IβIs a stable increment standard value, delta T, of zero sequence current of the feeder line1To determine the time period of stable grounding.
When the power distribution network is judged to have a stable single-phase earth fault, the time is delayed by delta T2Checking the neutral point displacement voltage U of the power gridNWhether delta of (d) still satisfies delta UNWhether the zero-sequence current increment of the feeder line still meets delta I or not0i≥IβIf the two are not satisfied, the arc suppression coil successfully suppresses the arc; if the power grid neutral point shifts voltage UNIs increased by an amount satisfying Δ UNIs not less than delta, but the zero sequence current increment delta I of any feeder line0i<IβTime-of-day, power grid neutral point displacement voltage UNThe increment of the voltage is new power grid neutral point displacement voltage U caused by induction adjustment after the fault of the arc suppression coilNThe new steady state value is used, and the arc suppression coil successfully suppresses the arc; if the zero sequence current increment of the feeder line is delta I0i≥IβWhen the arc suppression coil is not successfully arc-suppressed, the permanent single-phase earth fault occurs in the card-to-grid power distribution network, and at the moment, a partition type phase selection method is adoptedSelecting earth fault phase, closing compensation damping branch switch QF of device1Inputting damping resistance, detecting compensating damping branch current IRBAnd increment fixed value of resistive component of zero sequence current in each feeder line, at the moment, the stable increment fixed value delta I of the resistive component of the zero sequence current in the feeder lineR0=IRBThe feeder line is a grounding fault feeder line, delta T2And eliminating the transient fault time for the arc suppression coil.
After a stable single-phase earth fault of the power distribution network is judged to select an earth fault phase and an earth line, the earth switch of the fault phase is switched on to the ground, fault current is transferred, fault point potential is clamped, arc extinction processing is carried out on the fault again, and meanwhile, the compensation damping branch switch QF is switched off1。
When the fault phase is connected with the ground switch, the ground switch-on time reaches delta T3And then, the fault phase-to-ground switch is switched off, and the fault property is judged by adopting a differential fault property judgment method. Delta T3The switching-on time of the switch to the ground is transferred for the active intervention type arc suppression device.
After the permanent earth fault of the power distribution network is judged, a trip command is sent immediately, the fault feeder is cut off to realize the rapid isolation of the fault, and after the permanent earth fault is cut off and the fault characteristic signal disappears, the arc extinction device is actively interfered to reset; if the power distribution network does not allow the fault feeder line to be cut off immediately, the fault phase-to-ground switch is switched on again, the potential of the clamped fault point is low, and the arc extinction device is actively interfered to reset after a reset instruction is received after the fault is processed.
When QFfThe complete device of the opening and arc suppression coil and the active interference arc suppression device run independently, and the active interference arc suppression device acquires QFfAfter the brake separating position signal is sent, the operation is switched to an independent operation program, and QF of the arc extinction device is actively interfered2Disconnected, QF1Switching on, actively intervening the arc suppression device in the middle resistance grounding state, and collecting three-phase voltage and neutral point voltage U of the power grid during the active intervening of the arc suppression deviceNAnd only the zero sequence current of each feeder line of the bus where the active interference arc suppression device is positioned is collected, and the power grid respectively runs in the grounding mode of the arc suppression coil and the medium resistance connection of the active interference arc suppression deviceThe ground mode is used for carrying out fault processing by two different ground fault processing modes.
The arc suppression coil complete device and the active intervention arc suppression device are connected through a switch QFfThe switch is a bus tie switch or a section switch of a substation.
The partition type phase selection method is a ground fault phase selection method which is adopted for fault partition according to the magnitude of the neutral point displacement voltage and according to the distribution rule of fault phases of different partitions.
The differential fault property judgment method is a fault property judgment method adopted according to different ground fault characteristics after the phase transfer switch of the fault is switched off to the ground.
ΔT1In order to judge the time period of stable grounding, the time period is more than the measurement and inductance adjustment time of the arc suppression coil; delta T2The time for eliminating the transient fault for the arc suppression coil can be obtained through tests; delta T3The switching-on time of the switch to the ground is transferred for the active intervention type arc suppression device, and is set according to the requirements of personal safety and power supply reliability.
Delta is an increment standard value of the neutral point displacement voltage of the power distribution network, is selected according to the working sensitivity of the active interference arc suppression device and is larger than the fluctuation value of the neutral point displacement voltage of the power distribution network; i isβThe stable increment standard value of the zero sequence current of the feeder line is selected according to the detection sensitivity of the zero sequence current and is larger than the asymmetric leakage current value of the power grid.
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 (6)
1. A method for treating the ground fault between arc-suppressing coil and active interference arc-suppressing unit in parallel connection features that the arc-suppressing coil is a pre-regulated automatic tracking compensation arc-suppressing unit, the active interference arc-suppressing unit is a compensation damping type active interference arc-suppressing unit with compensation damping branchGrounding transformer JDB and neutral point voltage transformer TV0QF switch for compensating damping branch1Damping resistor R1And R2Damping resistance change-over switch QF2TA compensating damping branch current transformer1QF switch connected to ground by fault phasea、QFb、QFcTA transferring grounding current transformer2And a device control system, characterized in that: the arc suppression coil complete device and the active intervention arc suppression device are connected through a switch QFfThe switch-on and switch-off of the device realize independent operation or parallel operation, the device has two programs of independent operation and parallel operation, and the device is controlled by a switch QFfSwitching the opening and closing position signals; when QFfThe complete equipment of the closing and arc suppression coil is connected with the active interference arc suppression device in parallel, and the active interference arc suppression device acquires QFfSwitching to a parallel run sequence, QF, after a switch-on position signal2Switching on, conversion of compensation resistance to low resistance, QF1When the power grid is disconnected, the power grid normally runs in a preset arc suppression coil grounding mode, and the active intervention arc suppression device acquires the three-phase voltage U of the power grida、Ub、UcNeutral point voltage U of power gridNSimultaneously, zero sequence current of a bus feeder line of an arc suppression coil installation section and zero sequence current of a bus feeder line of an active interference arc suppression device are adopted;
when the grid is in time period delta T1Internal grid neutral point displacement voltage UNSteady increment of Δ UNDelta stable increment delta I of zero sequence current of any feeder line, wherein delta is larger than or equal to delta0i≥IβWhen the fault occurs, judging that the power grid has a stable single-phase earth fault, otherwise, judging that the fault is unstable earth and the operation mode of the power grid changes the disturbance of card-to-card; delta is the increment standard value of the power grid neutral point displacement voltage, IβIs a stable increment standard value, delta T, of zero sequence current of the feeder line1Judging the time period of stable grounding;
after the stable single-phase earth fault of the power distribution network is judged, the time delay delta T is carried out2Checking the neutral point displacement voltage U of the power gridNWhether delta of (d) still satisfies delta UNWhether the zero-sequence current increment of the feeder line still meets delta I or not0i≥IβIf, ifIf the two are not satisfied, the arc suppression coil successfully suppresses the arc; if the power grid neutral point shifts voltage UNIs increased by an amount satisfying Δ UNNot less than delta, but zero sequence current increment delta I of the feed line0i<IβTime-of-day, power grid neutral point displacement voltage UNThe increment of the voltage is the new steady-state change of the neutral point voltage of the power grid caused by inductance adjustment of the arc suppression coil, and the arc suppression coil successfully suppresses the arc; if the zero sequence current increment of the feeder line is delta I0i≥IβWhen the arc suppression coil is not successfully arc-suppressed, the permanent single-phase earth fault occurs in the card-to-grid power distribution network, the earth fault phase is selected by adopting a partition type phase selection method, and the compensation damping branch switch QF of the device is closed1Detecting the current I of the compensating damping branchRBAnd increment fixed value of resistive component of zero sequence current in each feeder line, at the moment, the stable increment fixed value delta I of the resistive component of the zero sequence current in the feeder lineR0=IRBThe feeder line is a grounding fault feeder line, delta T2Time to eliminate transient faults for the arc suppression coil;
after a stable single-phase earth fault of the power distribution network is judged to select an earth fault phase and an earth line, the earth switch of the fault phase is switched on to the earth to transfer fault current, the potential of a fault point is clamped, the fault is arc-extinguished again, and meanwhile, the compensation damping branch switch QF is switched off1；
When the fault phase is connected with the ground switch, the ground switch-on time reaches delta T3Then, a fault phase-to-ground switch is disconnected, and fault property judgment is carried out by adopting a differential fault property judgment method; delta T3Transferring the switch earth switching-on time for the active intervention type arc suppression device;
after the permanent earth fault of the power distribution network is judged, a trip is immediately sent out to remove the fault feeder to realize the rapid isolation of the fault, and after the permanent earth fault is removed, the intervention type arc suppression device is reset after the fault characteristic signal disappears; if the power distribution network does not allow to immediately cut off the fault feeder line, the fault phase-to-ground switch is switched on again, the potential of the clamped fault point is low, and after the fault is processed, the intervention type arc suppression device is reset after a reset instruction is received;
when QFfComplete equipment of opening and arc suppression coil and active intervention arc suppression deviceQF collected by vertical operation and active intervention arc extinction devicefAfter the brake separating position signal is sent, the operation is switched to an independent operation program, and QF of the arc extinction device is actively interfered2Disconnected, QF1Switching on, actively intervening the arc suppression device in the middle resistance grounding state, and collecting three-phase voltage and neutral point voltage U of the power grid during the active intervening of the arc suppression deviceNAnd only zero sequence current of each feeder line of a bus where the active interference arc suppression device is located is collected, the power grid respectively operates in an arc suppression coil grounding mode and an intermediate resistance grounding mode of the active interference arc suppression device, and two different grounding fault processing modes are used for carrying out fault processing.
2. An arc suppression coil and active intervening arc suppression device parallel ground fault handling method as claimed in claim 1, wherein: the arc suppression coil complete device and the active intervention arc suppression device are connected through a switch QFfThe switch is a bus tie switch or a section switch of a substation.
3. An arc suppression coil and active intervening arc suppression device parallel ground fault handling method as claimed in claim 1, wherein: the partition type phase selection method is a ground fault phase selection method which is adopted for fault partition according to the magnitude of the neutral point displacement voltage and according to the distribution rule of fault phases of different partitions.
4. An arc suppression coil and active intervening arc suppression device parallel ground fault handling method as claimed in claim 1, wherein: the differential fault property judgment method is a fault property judgment method adopted according to different ground fault characteristics after the phase transfer switch of the fault is switched off to the ground.
5. An arc suppression coil and active intervening arc suppression device parallel ground fault handling method as claimed in claim 1, wherein: delta T1In order to judge the time period of stable grounding, the time period is more than the measurement and inductance adjustment time of the automatic tracking compensation arc suppression device; delta T2The time for eliminating the transient fault for the arc suppression coil can be obtained through tests;ΔT3the switching-on time of the switch to the ground is transferred for the active intervention type arc suppression device, and is set according to the requirements of personal safety and power supply reliability.
6. An arc suppression coil and active intervening arc suppression device parallel ground fault handling method as claimed in claim 1, wherein: delta is an increment standard value of the neutral point displacement voltage of the power distribution network, is selected according to the working sensitivity of the active interference arc suppression device and is larger than the fluctuation of the neutral point displacement voltage of the power distribution network; i isβThe stable increment standard value of the zero sequence current of the feeder line is selected according to the detection sensitivity of the zero sequence current and is larger than the asymmetric leakage current value of the power grid.
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Application publication date: 20210205 |