CN106505546B - High-speed switch type arc-extinguishing resonance-extinguishing device and its operation method - Google Patents
High-speed switch type arc-extinguishing resonance-extinguishing device and its operation method Download PDFInfo
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- CN106505546B CN106505546B CN201611007484.8A CN201611007484A CN106505546B CN 106505546 B CN106505546 B CN 106505546B CN 201611007484 A CN201611007484 A CN 201611007484A CN 106505546 B CN106505546 B CN 106505546B
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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
Abstract
High-speed switch type arc-extinguishing resonance-extinguishing device and its operation method, it is related to circuit protection technical field, including operational monitoring module, automatic recovery module, ground fault control module, earthing wire-selecting module, fault alarm module, time memory module, harmonic elimination module and remote-transmission module, automatic recovery module is attached with operational monitoring module, ground fault control module is attached with automatic recovery module, earthing wire-selecting module is attached with ground fault control module, fault alarm module is attached with earthing wire-selecting module, time memory module is attached with fault alarm module, harmonic elimination module is attached with ground fault control module, remote-transmission module is attached with fault alarm module and time memory module respectively.The operation method of operation method and earthing wire-selecting module including ground fault control module.Rapid arc extinction harmonic elimination of the present invention, earth fault line selection and distinguishing speed are fast, and accuracy is high, and comprehensive performance is comprehensive.
Description
Technical field:
The present invention relates to circuit protection technical fields, and in particular to high-speed switch type arc-extinguishing resonance-extinguishing device and its operation side
Method.
Background technique:
The protective device of route selection, singlephase earth fault in existing is generally all independent, study cable, overhead line and
Under the various different line conditions such as mixed connection route, various types singlephase earth fault type occurs, the safety of power distribution network is protected
Have great importance.Existing fault distinguishing method mainly have it is several, now analysis its characteristics are as follows: not to low-impedance earthed system
Sensitive, hardware threshold setting is needed according to expertise, and different system thresholds are generally different, increase differentiation difficulty,
It realizes more difficult or needs to collect a large amount of fault data, and cannot judge specific failure phase.And fault line detection is long-term
As the running a great problem in scene, difficult point is mainly reflected in five aspects: (1) failure steady-state signal is faint, detection spirit
Low (2) the single-phase earthing complex of sensitivity, fault point electric arc influence big (3) scene interference is big, and small (4) arc suppression coil of signal-to-noise ratio is mended
It is complicated that degree of repaying influences big (5) fault transient characteristic.
Summary of the invention:
Technical problem to be solved by the present invention lies in existing technological deficiency is overcome, a kind of easy to use, synthesis is provided
Performance comprehensively, earth fault line selection and distinguishing speed it is fast, the high high-speed switch type arc-extinguishing resonance-extinguishing device of accuracy and its operation
Method.
The following technical solution is employed for the technical problems to be solved by the invention to realize:
High-speed switch type arc-extinguishing resonance-extinguishing device, it is characterised in that: including operational monitoring module, automatic recovery module, ground connection
FCM fault control module, earthing wire-selecting module, fault alarm module, time memory module, harmonic elimination module and remote-transmission module, it is described
Automatic recovery module is attached with operational monitoring module, and the ground fault control module is connected with automatic recovery module
It connects, the earthing wire-selecting module is attached with ground fault control module, the fault alarm module and earthing wire-selecting
Module is attached, and the time memory module is attached with fault alarm module, the harmonic elimination module and ground connection event
Barrier control module is attached, and the remote-transmission module is attached with fault alarm module and time memory module respectively.
The device also mass over-voltage protection module.
The device further includes voltage transformer, current transformer and crowbar circuit device, and the voltage transformer connects
It connects in operational monitoring module, the current transformer is connected in substrate route selection module, the crowbar circuit device connection
It is automatically replying between module and ground fault control module.
The operation method of the ground fault control module includes the following steps,
A, PT secondary side open delta residual voltage is monitored；
B, judge whether residual voltage occur, if residual voltage occur then enters step c, if there is not residual voltage
Enter step a；
It c, whether is power frequency to residual voltage frequency, if not power frequency is, it is concluded that conclusion, is judged as that high frequency, frequency dividing are ferromagnetic
Resonance issues signal and to respond harmonic elimination apparatus moving part；If power frequency then enters step d；
D, three-phase-voltage monitoring data are read, if wherein a phase or two-phase are normal phase voltage, other phase voltages are zero, then
PT primary side disconnection fault has occurred in judgement, and system sends warning signal；E is entered step if being not the case if what is occurred；
E, a normally closed single-phase earthing switch is put between the neutral point of PT and the earth, at this point, opening ground connection
Tripping is closed, and is overlapped rapidly；
F, judge whether open delta voltage is presence, is then judged as singlephase earth fault if it exists；If not then judging
To be judged as fundamental frequency ferromagnetic resonance, issues signal and to respond harmonic elimination apparatus movement.
The operation method of earthing wire-selecting module includes the following steps.When being grounded, residual voltage triggers line selection apparatus
Each circuit zero-sequence current is acquired into acquisition state, after each circuit first stage zero-sequence current data is taken out in processing；If
It is arc grounding, arc grounding is become metallic ground by extinguishing arc equipment by force, and line selection apparatus is acquired state acquisition each time again
Road zero-sequence current obtains second stage zero-sequence current data；Then each circuit second stage zero-sequence current data is subtracted relatively
The first stage zero-sequence current data answered obtains incremental value, and the maximum route of increment is fault wire.
The over-voltage protection module is from the non-maintaining combination overvoltage protector of disengaging.
The harmonic elimination module is for anti-saturation voltage transformer and strong in first winding neutral point installation semiconductor self-limiting
Damp suppressor.
The present invention judges by the way that whether monitoring electromagnetic voltage mutual inductor secondary side open delta residual voltage occurs first
Whether system has occurred single-phase earthing, PT ferromagnetic resonance and PT disconnection fault, if residual voltage is zero, system goes successively to supervise
Survey state；If residual voltage is not zero, residual voltage frequency is analyzed to judge whether failure is that high frequency or frequency dividing are humorous
Vibration.If frequency is not power frequency, judgement has occurred high frequency or Subharmonic Resonance, issues signal and accordingly to eliminate resonance device and moves
Make；Fault type is further judged if frequency is power frequency.Three-phase-voltage monitoring data are read, if wherein a phase or two-phase are positive
Normal phase voltage, other phase voltages are zero, then PT primary side disconnection fault has occurred in judgement, and system sends warning signal；If occurring
Be not the case, then further judgement be singlephase earth fault or fundamental frequency ferromagnetic resonance.In the neutral point and the earth of PT
Between one normally closed single-phase earthing switch of investment, at this point, earthing switch is made to trip, and be overlapped rapidly.If open delta
Voltage is as caused by resonance, then the zero sequence circuit of PT has been cut off in the disconnection of earthing switch, destroys condition of resonance, is overlapped again
It not will lead to and generate new excitation and resonance, but restore to operate normally, open delta voltage 0 is judged as that fundamental frequency is ferromagnetic humorous
Vibration issues signal and to respond harmonic elimination apparatus movement；If open delta voltage is generated by singlephase earth fault, ground connection is opened
After coincidence is opened in shutdown, open delta voltage is still above threshold value, and the coincidence of single-phase switch does not influence the original voltage instruction of PT
Function is judged as singlephase earth fault, and runs next subprogram.
Study cable, under the various different line conditions such as overhead line and mixed connection route, various types single-phase earthing occurs therefore
Hinder method of discrimination when type, it is intended to provide original foundation for the movement of failure line selection, positioning and high-speed switch arc-extinction device.
According to the theory analysis and simulation calculation to power distribution network dependent failure, cause PT secondary side open delta to various
The raised fault type of voltage value and failure mechanism carry out theory analysis, the characteristic parameter rule of the various fault types of induction and conclusion
Rule；And the simulation model of different faults type is established using EMTP electromagnetic transient simulation software, correlated characteristic parameter is calculated
Value, is mutually authenticated with theoretical analysis result.
Isolated neutral distribution system causes the raised fault type of PT open delta residual voltage to have single-phase earthing event
Barrier, ferromagnetic resonance resonance and PT disconnection fault arrange by early-stage study and current period verifying and obtain these three fault type features
Parameter is listed as follows:
The characteristic parameter of power distribution network most common failure type
On the basis of the theory analysis and simulation calculation to various fault types, fast and efficiently single-phase earthing event is proposed
The method of discrimination of barrier, PT ferromagnetic resonance and PT disconnection fault, according to fault distinguishing method, computer programming realizes high-speed switch type
Arc-extinguishing resonance-extinguishing device fault distinguishing method and relevant action strategy.
The present invention comprehensively considers the deficiency of existing selection method, for isolated neutral system, before arc extinction
Faulty line zero-sequence current changes maximum principle afterwards, carries out failure in conjunction with colony amplitude comparison phase comparing method, active mode current method of addition
Selection method research.Meanwhile the accuracy to guarantee signal differentiation, residual voltage and zero-sequence current are pre-processed, used
The methods of Butterworth digital filter, LMS sef-adapting filter, Kalman filter effectively handle signal,
More reliable signal component is extracted, route selection accuracy is improved.
Passed through by domestic and international various earthing mode Fault Locating Method investigation reports to domestic and international present Research and existing
The analysis and evaluation of protection technique are positioned, the present invention considers to close a floodgate front and back faulty line zero-sequence current variation using high-speed switch most
Big principle combines several localization methods, carries out fault section positioning using the methods of FTU.
Function of the present invention:
Operational monitoring function: display system working voltage on device panel when normal operation, and number can be realized with upper level
According to teletransmission, moreover it is possible to which external circuit provides secondary voltage signal, replaces conventional PT cabinet and its measuring instrument.
Ground fault control function: when singlephase earth fault occurs for system, device mutually can directly be connect failure within 3ms
Ground, Setup Controller issue alarm and output relay contact point signal, extinguish ground arc, by the arc grounding mistake of non-faulting phase
Voltage limits the level of security of on-Line Voltage, efficiently controls the further development of failure, and can maintain system band single-phase earthing
Failure is at least run 2 hours, to guarantee the enough grid switching operation time.Controller needs the family of linkage control overhead transmission line simultaneously
Outer on-pole switch closes a floodgate when master station and issues signal conjunction Standard type split-phase switch immediately, when master station's separating brake issues signal point immediately
Standard type split-phase switch.The state of Standard type split-phase switch is monitored simultaneously.
Earthing wire-selecting function: as master station's selector control device, each substation route selection data receiver and comprehensive descision can be looked for
Specific faulty line out；Small current line selection module based on maximal increment principle, according to each route zero sequence before and after arc extinction
Faulty line is rapidly and accurately selected in the variation of electric current, and failure wire size is provided on panel.No matter arc-extinction device ground protection
Whether function puts into operation, and line selection device for low current should be able to work normally.
Auto restore facility: automatically reseting primary after device action 30S, no longer dynamic if belonging to instantaneity ground fault
Make, system is restored to operate normally, no longer separating brake after failure phase earthing switch closes a floodgate again if belonging to permanent earth fault.
Device has the function of rem ote reset, meets the requirement of unattended duty substation.Non-faulting occurs after device action again mutually to insulate
When puncturing over the ground, failure phase earthing switch in 5ms or so quick acting switching-off avoids that line to line fault occurs, while being not necessarily to human intervention
Automatically movement next time is carried out to prepare.
Over-voltage limitation function: it should be installed in device from non-maintaining combination overvoltage protector is detached from, generation should be able to be existed
Overvoltage relatively and between phase and phase is restricted to lower level, overvoltage can be limited in when single-phase arc grounding occurs
The level of security of line voltage.
Eliminate resonance function: device installs semiconductor additional from limit using anti-saturation voltage transformer and in first winding neutral point
Heavy damping suppressor is flowed, can effectively destroy ferromagnetic resonance condition, forced voltage transformer exits saturation state, depth is prevented to be saturated
Cause voltage transformer heavy overload.
Fault alarm function: when system working voltage is higher than the overvoltage value of controller tuning, device Display panel mistake
Voltage failure, three-phase voltage value simultaneously provide alarm signal；When low voltage value of the system voltage lower than measure and control device adjusting, survey
Control device display screen shows low voltage failure, three-phase voltage value and provides alarm signal.
Episodic memory function: electrical quantity when the recordable type for being not less than 20 failures of device, time of origin and failure,
Effective information is provided for the analysis and processing of failure, moreover it is possible to the time for recording on-site parameters setting and function setting, be convenient for accident
Analysis.
Data remote function: RS-485 should be arranged in device and optical fiber interface externally communicates, can be with the auspicious PC optical fiber master control in south
Carry out data exchange, using agreement and the auspicious coordination in south, user can by the auspicious PC optical fiber master control real-time monitoring operating status in south,
System voltage has access to event argument.
Self-limiting heavy damping suppressor: can be realized continuous quick harmonic elimination, and the harmonic elimination time of first-harmonic resonance is about 1.56s,
The harmonic elimination time of Subharmonic Resonance is about 2.1s or so.Under 3.5 times of overvoltage, current-limiting resonance eliminator can limit PT excitation current
In 100mA or less.
It is analyzed with the advantages of prior art:
| Parameter | Market product | The present invention |
| The arc-suppression grounded time | 100-160ms or so | ≤15ms |
| Opening time | 80ms or so | ≤5ms |
| It is grounded the phase selection time | 20-40ms | ≤3ms |
| The earthing wire-selecting time | 20-40ms | ≤3ms |
Using the damping action of resistance, its condition of resonance can be destroyed, resonance is eliminated.SIDR is installed in series in PT neutral point
Between ground, resistance is 40k Ω or so under normal operating condition, and the impedance of PT first winding is mega-ohms, therefore will not be right
The properties of PT have an impact, while will not substantially change the parameters of system.The core sataration when resonance occurs for PT,
First winding excitation current increases, and one time current-limiting resonance eliminator temperature increases, and resistance value quickly increases, and plays damping action.And
And resonant energy is bigger, the harmonic elimination time of a current-limiting resonance eliminator is shorter.
Fast breaker: can individual-phase control (three mechanism of three-phase, single-phase control), using special band triggered gap vacuum bubbles,
It 2us conducting can be switched after receiving switching signal, solve the problems, such as quickly to extinguish electric arc.
The beneficial effects of the present invention are: rapid arc extinction harmonic elimination of the present invention, many reference amounts high-speed switch fault distinguishing method, ground connection event
Hinder route selection and distinguishing speed is fast, accuracy is high, and comprehensive performance is comprehensive.
Detailed description of the invention:
Fig. 1 is high-speed switch type arc-extinguishing resonance-extinguishing device system schematic of the present invention.
Fig. 2 is the operation method schematic diagram of high-speed switch type arc-extinguishing resonance-extinguishing device of the present invention
Fig. 3 is four circuit zero-sequence current route selection schematic diagram of the embodiment of the present invention.
Specific embodiment:
In order to realize the present invention technological means, create new feature, reach purpose and effect is easy to understand, below
In conjunction with being specifically illustrating, the present invention is further explained.
As shown in Figure 1, high-speed switch type arc-extinguishing resonance-extinguishing device, including operational monitoring module, automatic recovery module, ground connection event
Hinder control module, earthing wire-selecting module, fault alarm module, time memory module, harmonic elimination module and remote-transmission module, it is automatic to restore
Module is attached with operational monitoring module, and ground fault control module is attached with automatic recovery module, earthing wire-selecting mould
Block is attached with ground fault control module, and fault alarm module is attached with earthing wire-selecting module, time memory module
Be attached with fault alarm module, harmonic elimination module is attached with ground fault control module, remote-transmission module respectively with failure
Alarm module and time memory module are attached.Device also mass over-voltage protection module.Device further include voltage transformer,
Current transformer and crowbar circuit device, voltage transformer are connected in operational monitoring module, and current transformer is connected to substrate choosing
On wire module, crowbar circuit device, which is connected to, to be automatically replied between module and ground fault control module.
As shown in Fig. 2, the operation method of high-speed switch type arc-extinguishing resonance-extinguishing device, the operation method of ground fault control module
Include the following steps,
A, PT secondary side open delta residual voltage is monitored；
B, judge whether residual voltage occur, if residual voltage occur then enters step c, if there is not residual voltage
Enter step a；
It c, whether is power frequency to residual voltage frequency, if not power frequency is, it is concluded that conclusion, is judged as that high frequency, frequency dividing are ferromagnetic
Resonance issues signal and to respond harmonic elimination apparatus moving part；If power frequency then enters step d；
D, three-phase-voltage monitoring data are read, if wherein a phase or two-phase are normal phase voltage, other phase voltages are zero, then
PT primary side disconnection fault has occurred in judgement, and system sends warning signal；E is entered step if being not the case if what is occurred；
E, a normally closed single-phase earthing switch is put between the neutral point of PT and the earth, at this point, opening ground connection
Tripping is closed, and is overlapped rapidly；
F, judge whether open delta voltage is presence, is then judged as singlephase earth fault if it exists；If not then judging
To be judged as fundamental frequency ferromagnetic resonance, issues signal and to respond harmonic elimination apparatus movement.
As shown in figure 3, tetra- circuits total 1#, 2#, 3# and 4#, the corresponding electric current in four circuits is respectively i1、i2、i3And
i4, when being grounded, residual voltage can trigger line selection apparatus and enter each circuit zero-sequence current of acquisition state acquisition, by filtering
Each circuit first stage zero-sequence current data is taken out in processing.Such as 1,2,3, the electric current of 4# line be respectively+4A ,+5A ,+6A, -15A.
If it is arc grounding, arc grounding is become metallic ground by extinguishing arc equipment by force, and line selection apparatus is acquired state acquisition again
Each circuit zero-sequence current, obtains second stage zero-sequence current data.The current direction for being grounded 1,2,3, No. 4 line at this time is consistent, can
It can be about+4A ,+5A ,+6A ,+5A, four line currents distinguish phase with the+4A of first stage ,+5A ,+6A, -15A respectively at this time
The incremental difference subtracted is 0A, 0A, 0A, 20A, and the increment of fault wire (No. 4 lines) is 20A, is the maximum route of increment, can select
Fault wire.Processing is be filtered to each circuit zero-sequence current.
Over-voltage protection module is from the non-maintaining combination overvoltage protector of disengaging.
Harmonic elimination module is anti-saturation voltage transformer and installs the suppression of semiconductor self-limiting heavy damping additional in first winding neutral point
Device processed.
The device of the invention is arranged in control cabinet, and the technical parameter of control cabinet is as follows:
Voltage rating: 10kV
Maximum operating voltage: 12kV
Rated current: 630A
Rated short circuit drop-out current: 40kA
Mechanical closing time is less than :≤15ms
Mechanical opening time is less than :≤6ms
Electrical closing time is less than :≤2us
It is grounded the phase selection time :≤3ms
The earthing wire-selecting time :≤3ms
Dielectric level: 1 minute industrial frequency withstand voltage 42kV of equipment, lightning impulse pressure resistance: 75kV.
Dynamic current: 100kA (peak value)
Switchgear outer dimension mm (high × wide × deep): 2300 × 800 (1000) × 1500
(standard cabinet)
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (6)
1. high-speed switch type arc-extinguishing resonance-extinguishing device, it is characterised in that: including operational monitoring module, automatic recovery module, ground connection event
Hinder control module, earthing wire-selecting module, fault alarm module, time memory module, harmonic elimination module and remote-transmission module, it is described from
Dynamic recovery module is attached with operational monitoring module, and the ground fault control module is connected with automatic recovery module
It connects, the earthing wire-selecting module is attached with ground fault control module, the fault alarm module and earthing wire-selecting
Module is attached, and the time memory module is attached with fault alarm module, the harmonic elimination module and ground connection event
Barrier control module is attached, and the remote-transmission module is attached with fault alarm module and time memory module respectively；
Wherein:
Operational monitoring module: display system working voltage on device panel when normal operation, and can realize that data are remote with upper level
It passes, moreover it is possible to which external circuit provides secondary voltage signal, replaces conventional PT cabinet and its measuring instrument；
Automatic recovery module: it automatically resets after device action 30S primary, is not reoperated if belonging to instantaneity ground fault, be
System restores to operate normally, no longer separating brake after failure phase earthing switch closes a floodgate again if belonging to permanent earth fault；Device
Have the function of rem ote reset, meets the requirement of unattended duty substation；Non-faulting occurs after device action again mutually to insulate over the ground
When breakdown, failure phase earthing switch in 5ms or so quick acting switching-off avoids that line to line fault occurs, while automatic without human intervention
Movement next time is carried out to prepare；
Ground fault control module: when singlephase earth fault occurs for system, failure can be mutually directly grounded by device within 3ms,
Setup Controller issues alarm and output relay contact point signal, extinguishes ground arc, and the arc grounding of non-faulting phase is excessively electric
The level of security of pressure limitation on-Line Voltage, efficiently controls the further development of failure, and can maintain system band single-phase earthing event
Barrier is at least run 2 hours, to guarantee the enough grid switching operation time；Controller needs the open air of linkage control overhead transmission line simultaneously
On-pole switch closes a floodgate when master station and issues signal conjunction Standard type split-phase switch immediately, when master station's separating brake issues signal point family immediately
Split-phase switch on column jacket, while the state of Standard type split-phase switch is monitored；
Eliminate resonance function: device is using anti-saturation voltage transformer and strong in first winding neutral point installation semiconductor self-limiting
Suppressor is damped, ferromagnetic resonance condition can be effectively destroyed, forced voltage transformer exits saturation state, prevents depth saturation from causing
Voltage transformer heavy overload；
Earthing wire-selecting module: as master station's selector control device, tool can be found out to each substation route selection data receiver and comprehensive descision
Body faulty line；Small current line selection module based on maximal increment principle, according to each route zero-sequence current before and after arc extinction
Variation, rapidly and accurately select faulty line, and failure wire size is provided on panel；No matter arc-extinction device ground protection function
Whether put into operation, line selection device for low current should be able to work normally；
Fault alarm module: when system working voltage is higher than the overvoltage value of controller tuning, device Display panel overvoltage
Failure, three-phase voltage value simultaneously provide alarm signal；When low voltage value of the system voltage lower than measure and control device adjusting, observing and controlling dress
Display screen is set to show low voltage failure, three-phase voltage value and alarm signal is provided；
Time memory module: electrical quantity when the recordable type for being not less than 20 failures of device, time of origin and failure, for event
The analysis and processing of barrier provide effective information, moreover it is possible to the time for recording on-site parameters setting and function setting, be convenient for crash analysis；
Remote-transmission module: RS-485 should be arranged in device and optical fiber interface externally communicates, and can carry out data with the auspicious PC optical fiber master control in south
Exchange, using the auspicious coordination of agreement and south, user is adjusted by the auspicious PC optical fiber master control real-time monitoring operating status in south, system voltage
Read event argument；
The operation method of the ground fault control module includes the following steps,
A, PT secondary side open delta residual voltage is monitored；
B, judge whether residual voltage occur, if residual voltage occur then enters step c, enter if not occurring residual voltage
Step a；
It c, whether is power frequency to residual voltage frequency, if not power frequency, it is concluded that conclusion, is judged as high frequency, frequency dividing ferromagnetic resonance,
Signal is issued to respond harmonic elimination apparatus moving part；If power frequency then enters step d；
D, three-phase-voltage monitoring data are read, if wherein a phase or two-phase are normal phase voltage, other phase voltages are zero, then judge
PT primary side disconnection fault has occurred, system sends warning signal；E is entered step if being not the case if what is occurred；
E, a normally closed single-phase earthing switch is put between the neutral point of PT and the earth, at this point, jumping earthing switch
Lock, and be overlapped rapidly；
F, judge whether open delta voltage is presence, is then judged as singlephase earth fault if it exists；If not being then judged as
Break as fundamental frequency ferromagnetic resonance, issues signal and to respond harmonic elimination apparatus movement.
2. high-speed switch type arc-extinguishing resonance-extinguishing device according to claim 1, it is characterised in that: the device also mass mistake
Voltage protection module.
3. high-speed switch type arc-extinguishing resonance-extinguishing device according to claim 1, it is characterised in that: the device further includes electricity
Pressure mutual inductor, current transformer and crowbar circuit device, the voltage transformer are connected in operational monitoring module, the electricity
Current transformer is connected in substrate route selection module, and the crowbar circuit device, which is connected to, automatically replies module and ground fault control
Between module.
4. high-speed switch type arc-extinguishing resonance-extinguishing device according to claim 1, it is characterised in that: the operation of earthing wire-selecting module
Method includes the following steps, when being grounded, residual voltage triggering line selection apparatus enters acquisition state and acquires each circuit zero sequence
Electric current, after each circuit first stage zero-sequence current data is taken out in processing；If it is arc grounding, extinguishing arc equipment connects arc light
Ground becomes metallic ground by force, and line selection apparatus is acquired each circuit zero-sequence current of state acquisition again, obtains second stage zero sequence
Current data；Then each circuit second stage zero-sequence current data corresponding first stage zero-sequence current data is subtracted to obtain
Incremental value, the maximum route of increment is fault wire.
5. high-speed switch type arc-extinguishing resonance-extinguishing device according to claim 2, it is characterised in that: the overvoltage protection mould
Block is from the non-maintaining combination overvoltage protector of disengaging.
6. high-speed switch type arc-extinguishing resonance-extinguishing device according to claim 1, it is characterised in that: the harmonic elimination module is anti-
Saturation voltage mutual inductor simultaneously installs semiconductor self-limiting heavy damping suppressor additional in first winding neutral point.
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| CN109521332A (en) * | 2018-12-19 | 2019-03-26 | 国网北京市电力公司 | Fault handling method, apparatus and system |
| CN110323731B (en) * | 2019-07-03 | 2021-05-11 | 张安斌 | Voltage transformer primary side neutral point controllable impedance resonance elimination device |
| CN110739670B (en) * | 2019-11-28 | 2021-03-02 | 国网江苏省电力有限公司镇江供电分公司 | 110kV line disconnection relay protection method for comparing voltages at two sides of line |
| CN113671412A (en) * | 2021-09-10 | 2021-11-19 | 国网安徽省电力有限公司检修分公司 | Low-current grounding line selection device |
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