CN107797034A - The detection means and method of dielectric recovery property after a kind of high-voltage sf6 circuit breaker arc - Google Patents
The detection means and method of dielectric recovery property after a kind of high-voltage sf6 circuit breaker arc Download PDFInfo
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- CN107797034A CN107797034A CN201710939845.0A CN201710939845A CN107797034A CN 107797034 A CN107797034 A CN 107797034A CN 201710939845 A CN201710939845 A CN 201710939845A CN 107797034 A CN107797034 A CN 107797034A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1281—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of liquids or gases
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1254—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of gas-insulated power appliances or vacuum gaps
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
Abstract
The invention belongs to the detection means and method of dielectric recovery property after High-Voltage Technology and high voltage electrical apparatus technical field, more particularly to a kind of high-voltage sf6 circuit breaker arc.The device includes direct current multiplication of voltage loop, and dynamic punctures loop, Control protection system, testing ＆ measuring system, is tested breaker CB, high power laboratory system power supply；It is to be sequentially connected and connect by direct current multiplication of voltage loop, dynamic breakdown loop, subject breaker CB and high power laboratory system power supply；Testing ＆ measuring system is connected with dynamic breakdown loop and subject breaker CB respectively；Control protection system is connected with dynamic breakdown loop, subject breaker and high power laboratory system power supply respectively.The present invention avoids conventional breaker simulation calculation from drawing calculation error caused by dielectric recovery property curve, test method has generality, the accuracy of dielectric recovery property measurement can be increased, improve test measurement efficiency and precision, guarantee test result reliability, have a wide range of application, economic benefit prospect is considerable.
Description
Technical field
After High-Voltage Technology and high voltage electrical apparatus technical field, more particularly to a kind of high-voltage sf6 circuit breaker arc
The detection means and method of dielectric recovery property.
Background technology
High-voltage sf6 circuit breaker post arc restriking phenomenon can produce the switching overvoltage that amplitude is high, frequency is big, endanger power train
The insulation safety for equipment of uniting.Can breaker occur repeated breakdown and depend primarily on after breaker arc between dielectric insulation intensity and contact
More than dielectric insulation intensity re-breakdown phenomenon then occurs for the comparison of transient recovery voltage (TRV), transient recovery voltage.Breaker arc
Afterwards dielectric insulation intensity with open away from or the time change curve then be referred to as dielectric recovery property.Type approval test is cut-off in breaker
In, breaker is only examined under different Breaking capacities, different working conditions, the TRV curves provided according to standard, can be cut-off into
Work(, standard requirement is not done to dielectric recovery property after arc.Dielectric recovery property is to determine breaker Breaking capacity and can after arc
By the central factor of property, it is the technical chart that breaker production designing unit pays close attention to, directly affects arc-extinguishing chamber of circuit breaker knot
The key links such as structure design, Insulation Coordination, operating mechanism selection.At present both at home and abroad also without for after high-voltage sf6 circuit breaker arc
The mature technology method of dielectric recovery property detection.
The content of the invention
The present invention is directed to above-mentioned problems of the prior art, there is provided medium is extensive after a kind of high-voltage sf6 circuit breaker arc
The detection means and method of multiple characteristic, it is the dielectric recovery property that synthesis loop is cut-off based on high-voltage sf6 circuit breaker Large Copacity
Detection means and method.Purpose is for dielectric recovery property after accurate measurement breaker arc, and designing unit is produced for breaker
Design reference is provided, technical support is provided for breaker operation maintenance unit.
The technical solution adopted for the present invention to solve the technical problems is：
The detection means of dielectric recovery property after a kind of high-voltage sf6 circuit breaker arc, including direct current multiplication of voltage loop, dynamic puncture
Loop, Control protection system, testing ＆ measuring system, it is tested breaker CB, high power laboratory system power supply；Specifically by direct current times
Road, dynamic breakdown loop, subject breaker CB and high power laboratory system power supply is pushed back to be sequentially connected and connect；Testing ＆ measuring system point
It is not connected with dynamic breakdown loop and subject breaker CB；Control protection system is breaking with dynamic breakdown loop, subject respectively
Device and high power laboratory system power supply are connected.
The direct current multiplication of voltage loop includes ac step-up transformer T, direct current capacitors C1, direct current capacitors C2, direct current
Container C3 and direct current capacitors C4, high voltage silicon rectifier stack D2, high voltage silicon rectifier stack D3 and high voltage silicon rectifier stack D4；Ac step-up transformer T high-pressure sides
Leading-out terminal is connected with direct current capacitors C2 ends of incoming cables, ac step-up transformer T high-pressure side earth terminals and direct current capacitors C1 inlet wires
End connected with high voltage silicon rectifier stack D1 ends of incoming cables, direct current capacitors C2 leading-out terminals respectively with high voltage silicon rectifier stack D1 leading-out terminals, high voltage silicon rectifier stack D2
End of incoming cables connects with direct current capacitors C4 ends of incoming cables, direct current capacitors C1 leading-out terminals respectively with high voltage silicon rectifier stack D2 leading-out terminals, high pressure
Silicon stack D3 ends of incoming cables connect with direct current capacitors C3 ends of incoming cables, direct current capacitors C4 leading-out terminals respectively with high voltage silicon rectifier stack D3 outlets
End, high voltage silicon rectifier stack D4 ends of incoming cables, direct current capacitors C3 leading-out terminals respectively with high voltage silicon rectifier stack D4 leading-out terminals, high-tension resistive R ends of incoming cables
Connected with impulse capacitor C5 ends of incoming cables；AC220V voltages mainly are risen into AC50kV by ac step-up transformer T to arrive
Between AC250kV, because the voltage class for being tested breaker CB is different, according to transient recovery voltage peak after tune subject breaker arc
Value requires that multiple pushes back road serial capacitance device and high voltage silicon rectifier stack number, is suitable DC voltage by booster voltage rectifying conversion
U。
The dynamic breakdown loop includes impulse capacitor C5, the second impulse capacitor C6, capacitive divider C7, resistance point
Depressor R1, resitstance voltage divider R2, capacitor charging resistor R；Wherein, impulse capacitor C5 end of incoming cables and capacitor charging resistor
R ends of incoming cables, direct current capacitors C3 leading-out terminals, the connection of high voltage silicon rectifier stack D4 leading-out terminals, impulse capacitor C5 leading-out terminal ground connection, electric capacity
Device charging resistor R leading-out terminals and the second impulse capacitor C6 ends of incoming cables, resitstance voltage divider R1 ends of incoming cables and breaker CB1 ends of incoming cables
Connection, the second impulse capacitor C6 leading-out terminals are connected with capacitive divider C7 ends of incoming cables and oscilloscope signal input, electric capacity point
Depressor C7 leading-out terminal ground connection, resitstance voltage divider R1 leading-out terminals connect with resitstance voltage divider R2 ends of incoming cables and oscilloscope signal input
Connect, resitstance voltage divider R2 leading-out terminal ground connection；Impulse capacitor C5 capacitances are 0.5uF, the second impulse capacitor C6 capacitances
For 200pF, impulse capacitor C5, the second impulse capacitor C6 rated operational voltages and the DC voltage of direct current multiplication of voltage loop output
Suppress；Capacitive divider C7, resitstance voltage divider R1 and resitstance voltage divider R2 suitably select according to DC voltage；Capacitor charging electricity
Charge constants of the R regulation impulse capacitor C5 to the second impulse capacitor C6 is hindered, so as to adjust dynamic breakdown potential pressure point
Time interval；According to test requirements document and data acquiring frequency requirement, setting resistance value is respectively：0.5MΩ、1MΩ、1.5MΩ；
Impulse capacitor C5 is carried out by direct current multiplication of voltage loop 1 to charge to rated voltage, impulse capacitor C5 is charged by capacitor
Resistance R enters Mobile state charging to the second impulse capacitor C6.
The Control protection system of the circuit includes breaker CB1, breaker CB2 and breaker CB3, current transformer
CT, PLC controlling test unit；Wherein, breaker CB1 ends of incoming cables and resitstance voltage divider R1 ends of incoming cables, the second impulse capacitor C6
End of incoming cables connects with high-tension resistive R leading-out terminals, and breaker CB1 leading-out terminals enter with breaker CB2 ends of incoming cables summation current transformer CT
Line end is connected, and breaker CB2 leading-out terminals are connected with breaker CB3 ends of incoming cables, breaker CB3 leading-out terminals and high power laboratory power supply
Connection, Current Transmit leading-out terminal be connecteds with subject breaker CB5 ends of incoming cables, control signal that Current Transmit gathers and
The input of PLC controlling tests unit 7 connects, PLC controlling test units output end respectively with breaker CB1, breaker CB2, disconnected
Road device CB3, subject breaker CB5 operating mechanism control signal input connection；By the electric current for detecting Current Transmit
Signal, judge circuit breaker arc zero passage whether blow-out, so as to control breaker CB1, breaker CB2 and breaker CB3 division
Lock operates.
The testing ＆ measuring system, including breaker trip angular displacement sensor CG and high pressure oscilloscope；Wherein, breaker
Stroke angular displacement sensor CG is connected with subject breaker CB5 operating mechanism insulated tension pole rotating shafts, and breaker trip angular displacement passes
Sensor CG output signal lines are connected with high pressure oscilloscope；The voltage signal of capacitive divider, moment are detected by high pressure oscilloscope
Magnitude of voltage after record subject breaker blow-out between fracture；By the voltage signal of high pressure oscilloscope detection resistance divider, when
Engrave the DC voltage value of record direct current multiplication of voltage loop output；Detected by high pressure oscilloscope in subject breaker operation mechanism rotating shaft
Angular displacement signal, the moment record subject breaker stroke signal.
The high power laboratory system power supply is the professional direct power supply of laboratory's linked network, mono- using six 220kV/44MVA
Phase study transformer, exportable maximum short-circuit current value are 63kA.
The subject breaker CB is 40.5kV to 800kV high-voltage sf6 circuit breakers.
The detection method of dielectric recovery property after a kind of high-voltage sf6 circuit breaker arc, it is by ac step-up transformer T and straight
Stream multiplication of voltage loop punctures the impulse capacitor C5 in loop to dynamic and carries out charging to rated voltage, and impulse capacitor C5 is to second
Impulse capacitor C6 enters Mobile state charging, and the second impulse capacitor C6 is in parallel with subject breaker fracture, the dielectric insulation after arc
The second impulse capacitor C6 is to breaker fracture gap discharge when intensity is less than the second impulse capacitor C6 charging voltages, with disconnected
Mouth spacing increase, record difference open the dielectric breakdown voltage value away under, and until spacing is sufficiently large, the second impulse capacitor C6 charges
Undertension is untill medium between puncturing fracture；High power laboratory system power supply provides 10A to 63kA electricity for subject breaker
Stream, adjusts different drop-out current values, and detection difference cut-offs dielectric recovery property curve after the arc under arcing.Surveyed by testing
Measure system time record breaker trip and fracture voltage signal；Extraction difference opens the breakdown voltage value away under, passes through numerical value point
Analysis provides dielectric recovery property curve after arc.
The detection method of dielectric recovery property after a kind of described high-voltage sf6 circuit breaker arc, using 126kV be tested breaker as
Example, measures dielectric recovery property curve after arc, and concrete operations flow is as follows：
A. subject breaker CB is in closure state, and breaker CB1 disconnects, and breaker CB2 disconnects, breaker CB3 closures；
B. ac step-up transformer T low-pressure side AC220V power supplys are connected, ac step-up transformer T high side voltages are adjusted
To 100kV, by direct current capacitors C1, direct current capacitors C2, direct current capacitors C3, direct current capacitors C4 and high voltage silicon rectifier stack D1,
High voltage silicon rectifier stack D2, high voltage silicon rectifier stack D3, the direct current multiplication of voltage loop of high voltage silicon rectifier stack D4 compositions adjust voltage to DC400kV, pass through electricity
The voltage signal detection direct current multiplication of voltage output voltage loop value of divider R1 and resitstance voltage divider R2 collections is hindered, prevents overtension
Damage equipment；
C. impulse capacitor C5 (0.5uF) is carried out charging to rated operational voltage DC400kV by direct current multiplication of voltage loop,
Ac step-up transformer T power supplys are disconnected after charging complete；
D. 10A to 63kA current value is provided by high power laboratory system power supply, this selection provides 10kA current values.
It is expected to test by high power laboratory system, detects current waveform amplitude and whether frequency meets to require, setting electric current cut-offs phase
Position, adjust the arc time；
E. breaker CB2 closing operations are controlled by PLC controlling tests unit, electricity is now detected by Current Transmit
Waveform is flowed, subject breaker CB carries out sub-switching operation after detecting short circuit current, exists between fracture and cut-off electric arc；
F. the current waveform detected by Current Transmit judges that being tested breaker CB cut-offs whether electric arc extinguishes, it is determined that
After arc extinction, breaker CB3 sub-switching operations, breaker CB1 closing operations are controlled by controlling test unit；
G. the moment that breaker CB1 closes a floodgate, because subject breaker CB arcing contact gap dielectric dielectric strengths are relatively low, it is less than
The second impulse capacitor C6 voltage in parallel with fracture gap, fracture medium is breakdown, the second impulse capacitor C6 electric discharges；
H. after the second impulse capacitor C6 electric discharges, impulse capacitor C5 charges to the second impulse capacitor C6, now
Fracture spacing increases, and dielectric insulation intensity is further recovered.Between the second impulse capacitor C6 charging voltages are more than fracture again
During dielectric insulation intensity, fracture medium is breakdown again, and the second impulse capacitor C6 discharges again；
I. the increase of breaker fracture spacing is tested therewith, repeats that the second impulse capacitor C6 chargings, discharge process occurs, directly
Sufficiently large to fracture spacing, dielectric insulation intensity returns to the second impulse capacitor C6 charging voltages and is not enough to puncture between arcing contact
Untill；
J. capacitive divider C7 and breaker trip angular displacement sensor CG signals are gathered by high pressure oscilloscope, records quilt
It is different after examination breaker blow-out to open breakdown voltage and breaker arcing contact stroke waveform away under；
K. contrast breaker arcing contact stroke and fracture gap voltage curve, extraction each time dielectric breakdown process open away from
Value and breakdown voltage value；
L. data are handled by 10 test statistics, ten groups of data, Applying Numercal Analysis Method Assess, removes unusual hit
The reliability for a little, ensureing data is worn, data fitting is carried out to experiment breakdown voltage value, provides dielectric recovery property curve；
M. by changing direct current multiplication of voltage output voltage loop polarity, subject breaker drop-out current amplitude and phase angle, open circuit
Device cut-offs the experimental conditions such as speed, arc-chutes SF6 gas inflated pressure, detects the dielectric recovery property curve under different operating modes.
Advantages of the present invention and effect are：
1st, direct measurement is carried out to dielectric recovery property curve after high-voltage sf6 circuit breaker arc, avoids conventional breaker from emulating
Calculation error caused by dielectric recovery property curve is calculated.
2nd, dielectric recovery property detection method can be commonly applied to according to pilot system capacity after high-voltage sf6 circuit breaker arc
40.5kV-1100kV voltage class breaker, test method have generality.
3rd, can be by controlling the regulation breakdown of capacitor charging/discharging time constant using the charge-discharge principle of impulse capacitor
Voltage sampling site frequency, the accuracy of increase dielectric recovery property measurement.
4th, using numerical analysis method to difference open away from breakdown voltage analyze, provide dielectric recovery property song
Line, improve test measurement efficiency and precision.
5th, the automatic decision analysis of test measurement result is realized, breakdown point voltage after problematic arc is proposed and opens away from value,
Guarantee test result reliability.
6th, this method and device can extensive use, considerable benefit.
Brief description of the drawings
Below in conjunction with the accompanying drawings and specific embodiment, the present invention is further detailed explanation.
Fig. 1 is present system structural representation；
Fig. 2 is dielectric recovery property circuit structure principle schematic after breaker arc of the present invention；
Fig. 3 is present system output voltage waveform；
Fig. 4 is present media recovery characteristics result of the test and matched curve figure.
In figure：Direct current multiplication of voltage loop 1, dynamic puncture loop 2, Control protection system 3, testing ＆ measuring system 4, subject open circuit
Device CB5, high power laboratory system power supply 6, PLC controlling tests unit 7, high pressure oscilloscope 8, ac step-up transformer T, direct current
Container C1, direct current capacitors C2, direct current capacitors C3, direct current capacitors C4, high voltage silicon rectifier stack D1, high voltage silicon rectifier stack D2, high voltage silicon rectifier stack
D3, high voltage silicon rectifier stack D4, impulse capacitor C5, the second impulse capacitor C6, capacitive divider C7, resitstance voltage divider R1, resistance point
Depressor R2, capacitor charging resistor R, breaker CB1, breaker CB2, breaker CB3, Current Transmit, breaker trip
Angular displacement sensor CG.
Embodiment
The present invention is the detection means and method of dielectric recovery property after a kind of high-voltage sf6 circuit breaker arc, and one of which is high
The detection means of dielectric recovery property after pressure SF6 breaker arcs, including direct current multiplication of voltage loop 1, dynamic puncture loop 2, and control is protected
Protecting system 3, testing ＆ measuring system 4, it is tested breaker CB5, high power laboratory system power supply 6.Specifically by direct current multiplication of voltage loop
1st, dynamic breakdown loop 2, subject breaker CB5 and high power laboratory system power supply 6 are sequentially connected and connect；Testing ＆ measuring system 4 divides
It is not connected with dynamic breakdown loop 2 and subject breaker CB5；Control protection system 3 punctures loop 2, subject with dynamic respectively
Breaker 5 and high power laboratory system power supply 6 are connected.
The direct current multiplication of voltage loop 1 includes ac step-up transformer T, direct current capacitors C1, direct current capacitors C2, direct current
Container C3 and direct current capacitors C4, high voltage silicon rectifier stack D1, high voltage silicon rectifier stack D2, high voltage silicon rectifier stack D3 and high voltage silicon rectifier stack D4.Wherein, exchange rises
Pressure transformer T high-voltage side outlet wires end is connected with direct current capacitors C2 ends of incoming cables, ac step-up transformer T high-pressure side earth terminals with it is straight
Stream capacitor C1 ends of incoming cables connected with high voltage silicon rectifier stack D1 ends of incoming cables, direct current capacitors C2 leading-out terminals respectively with high voltage silicon rectifier stack D1 outlets
End, high voltage silicon rectifier stack D2 ends of incoming cables connected with direct current capacitors C4 ends of incoming cables, direct current capacitors C1 leading-out terminals respectively with high voltage silicon rectifier stack
D2 leading-out terminals, high voltage silicon rectifier stack D3 ends of incoming cables connect with direct current capacitors C3 ends of incoming cables, direct current capacitors C4 leading-out terminals respectively with height
Press silicon stack D3 leading-out terminals, high voltage silicon rectifier stack D4 ends of incoming cables, direct current capacitors C3 leading-out terminals respectively with high voltage silicon rectifier stack D4 leading-out terminals, high pressure
Resistance R ends of incoming cables connect with impulse capacitor C5 ends of incoming cables, as shown in Figure 2.Mainly will by ac step-up transformer T
AC220V voltages are risen between AC50kV to AC250kV, can be according to tune quilt because the voltage class for being tested breaker CB5 is different
Transient recovery voltage peaks demand multiple pushes back road serial capacitance device and high voltage silicon rectifier stack number after examination breaker arc, by booster electricity
Repoussage rheology is changed to suitable DC voltage U.Design parameter is as shown in table 1.
The dynamic breakdown loop 2 of the circuit includes impulse capacitor C5, the second impulse capacitor C6, capacitive divider C7,
Resitstance voltage divider R1, resitstance voltage divider R2, capacitor charging resistor R.Wherein, impulse capacitor C5 end of incoming cables is filled with capacitor
Resistance R ends of incoming cables, direct current capacitors C3 leading-out terminals, the connection of high voltage silicon rectifier stack D4 leading-out terminals, impulse capacitor C5 outlet termination
Ground, capacitor charging resistor R leading-out terminals and the second impulse capacitor C6 ends of incoming cables, resitstance voltage divider R1 ends of incoming cables and breaker
CB1 ends of incoming cables connect, and the second impulse capacitor C6 leading-out terminals connect with capacitive divider C7 ends of incoming cables and the signal input part of oscillograph 8
Connect, capacitive divider C7 leading-out terminal ground connection, resitstance voltage divider R1 leading-out terminals are believed with resitstance voltage divider R2 ends of incoming cables and oscillograph 8
The connection of number input, resitstance voltage divider R2 leading-out terminal ground connection.Impulse capacitor C5 capacitances are 0.5uF, the second pulsed capacitance
Device C6 capacitances are 200pF, and impulse capacitor C5, the second impulse capacitor C6 rated operational voltages and direct current multiplication of voltage loop 1 are defeated
The DC voltage gone out suppresses, as shown in table 1.Capacitive divider C7, resitstance voltage divider R1 and resitstance voltage divider R2 can be according to direct currents
Voltage suitably selects.It is normal to the second impulse capacitor C6 charging interval that capacitor charging resistor R can adjust impulse capacitor C5
Number, so as to adjust the time interval of dynamic breakdown potential pressure point.According to test requirements document and data acquiring frequency requirement, resistance can be set
Value is respectively：0.5MΩ、1MΩ、1.5MΩ.Impulse capacitor C5 is carried out by direct current multiplication of voltage loop 1 to charge to specified electricity
Pressure, impulse capacitor C5 enter Mobile state charging by capacitor charging resistor R to the second impulse capacitor C6.
The Control protection system 3 of the circuit includes breaker CB1, breaker CB2 and breaker CB3, Current Transmit,
PLC controlling tests unit 7.Wherein, breaker CB1 ends of incoming cables are entered with resitstance voltage divider R1 ends of incoming cables, the second impulse capacitor C6
Line end connects with high-tension resistive R leading-out terminals, breaker CB1 leading-out terminals and breaker CB2 ends of incoming cables summation current transformer CT inlet wires
End connection, breaker CB2 leading-out terminals are connected with breaker CB3 ends of incoming cables, and breaker CB3 leading-out terminals connect with high power laboratory power supply
Connect, Current Transmit leading-out terminal be connected with subject breaker CB5 ends of incoming cables, the control signal of Current Transmit collection and
The input of PLC controlling tests unit 7 connects, the output end of PLC controlling tests unit 7 respectively with breaker CB1, breaker CB2, disconnected
Road device CB3, subject breaker CB5 operating mechanism control signal input connection, as shown in Figure 2.By detecting Current Mutual Inductance
Device CT current signal, judge circuit breaker arc zero passage whether blow-out, so as to control breaker CB1, breaker CB2 and breaker
CB3 breaking-closing operating.
Described testing ＆ measuring system 4, including breaker trip angular displacement sensor CG and high pressure oscilloscope 8.Wherein, break
Road device stroke angular displacement sensor CG is connected with subject breaker CB5 operating mechanism insulated tension pole rotating shafts, breaker trip angle position
Displacement sensor CG output signal lines are connected with high pressure oscilloscope 8.The voltage signal of capacitive divider is detected by high pressure oscilloscope,
Magnitude of voltage after moment record subject breaker blow-out between fracture；Believed by the voltage of high pressure oscilloscope detection resistance divider
Number, the DC voltage value of moment record direct current multiplication of voltage loop output；Subject breaker operation mechanism is detected by high pressure oscilloscope
Angular displacement signal in rotating shaft, the stroke signal of moment record subject breaker.
The high power laboratory system power supply 6 is the professional direct power supply of laboratory's linked network, mono- using six 220kV/44MVA
Phase study transformer, exportable maximum short-circuit current value are 63kA.
The subject breaker CB5 can be 40.5kV to 800kV high-voltage sf6 circuit breakers.
The present invention is implemented by following technical scheme：
As depicted in figs. 1 and 2, Fig. 1 is present system structural representation, and Fig. 2 is that medium is extensive after breaker arc of the present invention
Multiple characteristic circuit structure principle schematic.Dynamic is punctured in loop by ac step-up transformer T and direct current multiplication of voltage loop
Impulse capacitor C5 carries out charging to rated voltage, and impulse capacitor C5 enters Mobile state charging to the second impulse capacitor C6, the
Two impulse capacitor C6 are in parallel with subject breaker fracture, and dielectric insulation intensity charges less than the second impulse capacitor C6 after arc
The second impulse capacitor C6 is to breaker fracture gap discharge during voltage, and as fracture spacing increases, record difference is opened away under
Dielectric breakdown voltage value, until spacing is sufficiently large, the second impulse capacitor C6 charging voltages are not enough to medium between puncturing fracture and are
Only.High power laboratory system power supply 6 provides 10A to 63kA electric current for subject breaker, can adjust different drop-out current values,
Detection difference cut-offs dielectric recovery property curve after the arc under arcing.Breaker is recorded by the moment of testing ＆ measuring system 4
Stroke and fracture voltage signal.As shown in figure 3, Fig. 3 is present system output voltage waveform.Extraction difference opens hitting away under
Magnitude of voltage is worn, dielectric recovery property curve after arc is provided by numerical analysis, as shown in figure 4, Fig. 4, which is present media, recovers special
Property result of the test and matched curve figure.
The present invention measures dielectric recovery property curve after arc, concrete operations flow is such as so that 126kV is tested breaker as an example
Under：
A. subject breaker CB is in closure state, and breaker CB1 disconnects, and breaker CB2 disconnects, breaker CB3 closures.
B. ac step-up transformer T low-pressure side AC220V power supplys are connected, ac step-up transformer T high side voltages are adjusted
To 100kV, by direct current capacitors C1, direct current capacitors C2, direct current capacitors C3, direct current capacitors C4 and high voltage silicon rectifier stack D1,
High voltage silicon rectifier stack D2, high voltage silicon rectifier stack D3, the direct current multiplication of voltage loop of high voltage silicon rectifier stack D4 compositions adjust voltage to DC400kV, pass through electricity
The voltage signal detection direct current multiplication of voltage output voltage loop value of divider R1 and resitstance voltage divider R2 collections is hindered, prevents overtension
Damage equipment.
C. impulse capacitor C5 (0.5uF) is carried out charging to rated operational voltage DC400kV by direct current multiplication of voltage loop,
Ac step-up transformer T power supplys are disconnected after charging complete.
D. 10A to 63kA current value is provided by high power laboratory system power supply, this selection provides 10kA current values.
It is expected to test by high power laboratory system, detects current waveform amplitude and whether frequency meets to require, setting electric current cut-offs phase
Position, adjust the arc time.
E. breaker CB2 closing operations are controlled by PLC controlling tests unit 7, now detected by Current Transmit
Current waveform, subject breaker CB carry out sub-switching operation after detecting short circuit current, exist between fracture and cut-off electric arc.
F. the current waveform detected by Current Transmit judges that being tested breaker CB cut-offs whether electric arc extinguishes, it is determined that
After arc extinction, breaker CB3 sub-switching operations, breaker CB1 closing operations are controlled by controlling test unit.
G. the moment that breaker CB1 closes a floodgate, because subject breaker CB arcing contact gap dielectric dielectric strengths are relatively low, it is less than
The second impulse capacitor C6 voltage in parallel with fracture gap, fracture medium is breakdown, the second impulse capacitor C6 electric discharges.
H. after the second impulse capacitor C6 electric discharges, impulse capacitor C5 charges to the second impulse capacitor C6, now
Fracture spacing increases, and dielectric insulation intensity is further recovered.Between the second impulse capacitor C6 charging voltages are more than fracture again
During dielectric insulation intensity, fracture medium is breakdown again, and the second impulse capacitor C6 discharges again.
I. the increase of breaker fracture spacing is tested therewith, repeats that the second impulse capacitor C6 chargings, discharge process occurs, directly
Sufficiently large to fracture spacing, dielectric insulation intensity returns to the second impulse capacitor C6 charging voltages and is not enough to puncture between arcing contact
Untill.
J. capacitive divider C7 and breaker trip angular displacement sensor CG signals are gathered by high pressure oscilloscope, records quilt
It is different after examination breaker blow-out to open breakdown voltage and breaker arcing contact stroke waveform away under, as shown in Figure 3.
K. contrast breaker arcing contact stroke and fracture gap voltage curve, extraction each time dielectric breakdown process open away from
Value and breakdown voltage value.
L. data are handled by 10 test statistics, ten groups of data, Applying Numercal Analysis Method Assess, removes unusual hit
Wear the reliability for a little, ensureing data.Data fitting is carried out to experiment breakdown voltage value, provides dielectric recovery property curve, such as Fig. 4
It is shown.
M. by changing direct current multiplication of voltage output voltage loop polarity, subject breaker drop-out current amplitude and phase angle, open circuit
Device cut-offs the experimental conditions such as speed, arc-chutes SF6 gas inflated pressure, detects the dielectric recovery property curve under different operating modes.
Table 1：Direct current multiplication of voltage loop element parameter list.
| Voltage class/kV | TRV peak values/kV | DC voltage U/kV | Transformer parameter | Capacitor and silicon stack number n | Capacitor parameters | Silicon stack rated voltage |
| 40.5 | 74.5 | 100 | 220V/50kV | 2 | 0.1uF/DC100kV | DC100kV |
| 72.5 | 133 | 200 | 220V/50kV | 4 | 0.1uF/DC100kV | DC100kV |
| 126 | 322 | 400 | 220V/100kV | 4 | 0.1uF/DC200kV | DC200kV |
| 252 | 514 | 800 | 220V/200kV | 4 | 0.1uF/DC400kV | DC400kV |
| 363 | 741 | 1000 | 220V/250kV | 4 | 0.1uF/DC500kV | DC500kV |
| 550 | 1123 | 1500 | 220V/250kV | 6 | 0.1uF/DC500kV | DC500kV |
| 800 | 1633 | 2000 | 220V/500kV | 4 | 0.1uF/DC1000kV | DC1000kV |
Claims (9)
1. the detection means of dielectric recovery property after a kind of high-voltage sf6 circuit breaker arc, it is characterized in that：Including direct current multiplication of voltage loop
（1）, dynamic breakdown loop（2）, Control protection system（3）, testing ＆ measuring system（4）, subject breaker CB（5）, Large Copacity examination
Check system power supply（6）；Specifically by direct current multiplication of voltage loop（1）, dynamic breakdown loop（2）, subject breaker CB（5）And Large Copacity
Pilot system power supply（6）It is sequentially connected and connects；Testing ＆ measuring system（4）Puncture loop with dynamic respectively（2）With subject breaker CB
（5）It is connected；Control protection system（3）Puncture loop with dynamic respectively（2）, subject breaker（5）And high power laboratory system
Power supply（6）It is connected.
2. the detection means of dielectric recovery property, its feature after a kind of high-voltage sf6 circuit breaker arc according to claim 1
It is：The direct current multiplication of voltage loop（1）Including ac step-up transformer T, direct current capacitors C1, direct current capacitors C2, DC capacitor
Device C3 and direct current capacitors C4, high voltage silicon rectifier stack D2, high voltage silicon rectifier stack D3 and high voltage silicon rectifier stack D4；Ac step-up transformer T high-pressure sides go out
Line end is connected with direct current capacitors C2 ends of incoming cables, ac step-up transformer T high-pressure side earth terminals and direct current capacitors C1 ends of incoming cables
Connected with high voltage silicon rectifier stack D1 ends of incoming cables, direct current capacitors C2 leading-out terminals enter with high voltage silicon rectifier stack D1 leading-out terminals, high voltage silicon rectifier stack D2 respectively
Line end connects with direct current capacitors C4 ends of incoming cables, direct current capacitors C1 leading-out terminals respectively with high voltage silicon rectifier stack D2 leading-out terminals, high pressure silicon
Heap D3 ends of incoming cables connect with direct current capacitors C3 ends of incoming cables, direct current capacitors C4 leading-out terminals respectively with high voltage silicon rectifier stack D3 leading-out terminals,
High voltage silicon rectifier stack D4 ends of incoming cables, direct current capacitors C3 leading-out terminals respectively with high voltage silicon rectifier stack D4 leading-out terminals, high-tension resistive R ends of incoming cables and arteries and veins
Rush the connection of capacitor C5 ends of incoming cables；AC220V voltages are mainly risen to by AC50kV to AC250kV by ac step-up transformer T
Between, due to being tested breaker CB（5）Voltage class it is different, according to adjust be tested breaker arc after transient recovery voltage peak value will
Ask multiple to push back road serial capacitance device and high voltage silicon rectifier stack number, be suitable DC voltage U by booster voltage rectifying conversion.
3. the detection means of dielectric recovery property, its feature after a kind of high-voltage sf6 circuit breaker arc according to claim 1
It is：The dynamic punctures loop（2）Including impulse capacitor C5, the second impulse capacitor C6, capacitive divider C7, electric resistance partial pressure
Device R1, resitstance voltage divider R2, capacitor charging resistor R；Wherein, impulse capacitor C5 end of incoming cables and capacitor charging resistor R
End of incoming cables, direct current capacitors C3 leading-out terminals, the connection of high voltage silicon rectifier stack D4 leading-out terminals, impulse capacitor C5 leading-out terminal ground connection, electric capacity
Device charging resistor R leading-out terminals and the second impulse capacitor C6 ends of incoming cables, resitstance voltage divider R1 ends of incoming cables and breaker CB1 ends of incoming cables
Connection, the second impulse capacitor C6 leading-out terminals and capacitive divider C7 ends of incoming cables and oscillograph（8）Signal input part connects, electric capacity
Divider C7 leading-out terminal ground connection, resitstance voltage divider R1 leading-out terminals and resitstance voltage divider R2 ends of incoming cables and oscillograph（8）Signal is defeated
Enter end connection, resitstance voltage divider R2 leading-out terminal ground connection；Impulse capacitor C5 capacitances are 0.5uF, the second impulse capacitor C6
Capacitance is 200pF, impulse capacitor C5, the second impulse capacitor C6 rated operational voltages and direct current multiplication of voltage loop（1）Output
DC voltage suppress；Capacitive divider C7, resitstance voltage divider R1 and resitstance voltage divider R2 suitably select according to DC voltage；Electricity
Condenser charge resistance R adjusts charge constants of the impulse capacitor C5 to the second impulse capacitor C6, is hit so as to adjust dynamic
Wear the time interval of electrical voltage point；According to test requirements document and data acquiring frequency requirement, setting resistance value is respectively：0.5MΩ、1M
Ω、1.5MΩ；Impulse capacitor C5 is carried out by direct current multiplication of voltage loop 1 to charge to rated voltage, impulse capacitor C5 passes through
Capacitor charging resistor R enters Mobile state charging to the second impulse capacitor C6.
4. the detection means of dielectric recovery property, its feature after a kind of high-voltage sf6 circuit breaker arc according to claim 1
It is：The Control protection system of the circuit（3）Including breaker CB1, breaker CB2 and breaker CB3, current transformer
CT, PLC controlling test unit（7）；Wherein, breaker CB1 ends of incoming cables and resitstance voltage divider R1 ends of incoming cables, the second impulse capacitor
C6 ends of incoming cables connect with high-tension resistive R leading-out terminals, breaker CB1 leading-out terminals and breaker CB2 ends of incoming cables summation current transformer CT
End of incoming cables is connected, and breaker CB2 leading-out terminals are connected with breaker CB3 ends of incoming cables, breaker CB3 leading-out terminals and high power laboratory electricity
Source is connected, and Current Transmit leading-out terminal is connected with subject breaker CB5 ends of incoming cables, the control signal of Current Transmit collection
With PLC controlling test units（7）Input connects, PLC controlling test units（7）Output end respectively with breaker CB1, breaker
CB2, breaker CB3, subject breaker CB5 operating mechanism control signal input connection；By detecting Current Transmit
Current signal, judge circuit breaker arc zero passage whether blow-out, so as to control breaker CB1, breaker CB2 and breaker CB3
Breaking-closing operating.
5. the detection means of dielectric recovery property, its feature after a kind of high-voltage sf6 circuit breaker arc according to claim 1
It is：The testing ＆ measuring system（4）, including breaker trip angular displacement sensor CG and high pressure oscilloscope（8）；Wherein, it is breaking
Device stroke angular displacement sensor CG is connected with subject breaker CB5 operating mechanism insulated tension pole rotating shafts, breaker trip angular displacement
Sensor CG output signal lines and high pressure oscilloscope（8）Connection；The voltage signal of capacitive divider is detected by high pressure oscilloscope,
Magnitude of voltage after moment record subject breaker blow-out between fracture；Believed by the voltage of high pressure oscilloscope detection resistance divider
Number, the DC voltage value of moment record direct current multiplication of voltage loop output；Subject breaker operation mechanism is detected by high pressure oscilloscope
Angular displacement signal in rotating shaft, the stroke signal of moment record subject breaker.
6. the detection means of dielectric recovery property, its feature after a kind of high-voltage sf6 circuit breaker arc according to claim 1
It is：The high power laboratory system power supply（6）It is single-phase using six 220kV/44MVA for the professional direct power supply of laboratory's linked network
Testing transformer, exportable maximum short-circuit current value are 63kA.
7. the detection means of dielectric recovery property, its feature after a kind of high-voltage sf6 circuit breaker arc according to claim 1
It is：The subject breaker CB（5）For 40.5kV to 800kV high-voltage sf6 circuit breakers.
8. the detection method of dielectric recovery property after a kind of high-voltage sf6 circuit breaker arc, it is characterized in that：Pass through ac step-up transformer
T and direct current multiplication of voltage loop puncture the impulse capacitor C5 in loop to dynamic and carry out charging to rated voltage, impulse capacitor C5
Enter Mobile state charging to the second impulse capacitor C6, the second impulse capacitor C6 is in parallel with subject breaker fracture, is situated between after arc
The second impulse capacitor C6 is to breaker fracture gap discharge when matter dielectric strength is less than the second impulse capacitor C6 charging voltages,
As fracture spacing increases, record difference opens the dielectric breakdown voltage value away under, until spacing is sufficiently large, the second impulse capacitor
C6 charging voltages are not enough to puncture between fracture untill medium；High power laboratory system power supply（6）10A is provided for subject breaker to arrive
63kA electric current, adjusts different drop-out current values, and detection difference cut-offs dielectric recovery property curve after the arc under arcing；It is logical
Overtesting measuring system（4）Moment records breaker trip and fracture voltage signal；Extraction difference opens the breakdown voltage value away under,
Dielectric recovery property curve after arc is provided by numerical analysis.
9. the detection method of dielectric recovery property, its feature after a kind of high-voltage sf6 circuit breaker arc according to claim 8
It is：So that 126kV is tested breaker as an example, dielectric recovery property curve after arc is measured, concrete operations flow is as follows：
A. subject breaker CB is in closure state, and breaker CB1 disconnects, and breaker CB2 disconnects, breaker CB3 closures；
B. connect ac step-up transformer T low-pressure side AC220V power supplys, by ac step-up transformer T high side voltages adjust to
100kV, pass through direct current capacitors C1, direct current capacitors C2, direct current capacitors C3, direct current capacitors C4 and high voltage silicon rectifier stack D1, height
Pressure silicon stack D2, high voltage silicon rectifier stack D3, the direct current multiplication of voltage loop of high voltage silicon rectifier stack D4 compositions adjust voltage to DC400kV, pass through resistance
The voltage signal detection direct current multiplication of voltage output voltage loop value of divider R1 and resitstance voltage divider R2 collections, prevents overtension from damaging
Evil equipment；
C. by direct current multiplication of voltage loop to impulse capacitor C5（0.5uF）Carry out charging to rated operational voltage DC400kV, charge
After the completion of disconnect ac step-up transformer T power supplys；
D. 10A to 63kA current value is provided by high power laboratory system power supply, this selection provides 10kA current values；Pass through
High power laboratory system is expected experiment, detects current waveform amplitude and whether frequency meets to require, setting electric current cut-offs phase, adjusts
The whole arc time；
E. breaker CB2 closing operations are controlled by PLC controlling tests unit, current wave is now detected by Current Transmit
Shape, subject breaker CB carry out sub-switching operation after detecting short circuit current, exist between fracture and cut-off electric arc；
F. the current waveform detected by Current Transmit judges that being tested breaker CB cut-offs whether electric arc extinguishes, and determines electric arc
After extinguishing, breaker CB3 sub-switching operations, breaker CB1 closing operations are controlled by controlling test unit；
G. the moment that breaker CB1 closes a floodgate, because subject breaker CB arcing contact gap dielectric dielectric strengths are relatively low, less than with breaking
Mouth gap the second impulse capacitor C6 voltages in parallel, fracture medium is breakdown, the second impulse capacitor C6 electric discharges；
H. after the second impulse capacitor C6 electric discharges, impulse capacitor C5 charges to the second impulse capacitor C6, now fracture
Spacing increases, and dielectric insulation intensity is further recovered；The medium between the second impulse capacitor C6 charging voltages are more than fracture again
During dielectric strength, fracture medium is breakdown again, and the second impulse capacitor C6 discharges again；
I. the increase of breaker fracture spacing is tested therewith, repeats that the second impulse capacitor C6 chargings, discharge process occurs, until disconnected
Mouthful spacing is sufficiently large, and dielectric insulation intensity, which returns to the second impulse capacitor C6 charging voltages and is not enough to breakdown, between arcing contact is
Only；
J. capacitive divider C7 and breaker trip angular displacement sensor CG signals are gathered by high pressure oscilloscope, record subject is disconnected
It is different after the device blow-out of road to open breakdown voltage and breaker arcing contact stroke waveform away under；
K. contrast breaker arcing contact stroke and fracture gap voltage curve, extraction each time dielectric breakdown process open away from value and
Breakdown voltage value；
L. data are handled by 10 test statistics, ten groups of data, Applying Numercal Analysis Method Assess, remove unusual breakdown point,
Ensure the reliability of data, data fitting is carried out to experiment breakdown voltage value, provides dielectric recovery property curve；
M. opened by changing direct current multiplication of voltage output voltage loop polarity, subject breaker drop-out current amplitude and phase angle, breaker
The experimental conditions such as disconnected speed, arc-chutes SF6 gas inflated pressure, detect the medium recovery under different operating modes
Characteristic curve.
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