CN104977480B - A kind of failure current test apparatus for high voltage DC transmission converter valve and its test method - Google Patents
A kind of failure current test apparatus for high voltage DC transmission converter valve and its test method Download PDFInfo
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Abstract
The present invention relates to a kind of experimental rig of direct-current transmission converter valve and its test method, and in particular to a kind of failure current test apparatus for high voltage DC transmission converter valve and its test method.Described device includes high voltage circuit, test product valve and DC current return in parallel successively, and fault current loop is connected with high voltage circuit and test product valve Vt respectively；A kind of test method of experimental rig is also provided, the present invention makes full use of superposition circuit theory, improve the utilization ratio of device, save cost, test method can realize the large-scale regulation of fault current, it disclosure satisfy that conventional high-pressure DC engineering and extra-high voltage direct-current engineering converter valve fault current test requirements document, versatility is good.Test method makes full use of superposition circuit theory, makes it under conditions of equal with Practical Project current peak, fault current intensity I2T is closer to actual operating mode.
Description
Technical field
The present invention relates to a kind of experimental rig of direct-current transmission converter valve and its test method, and in particular to a kind of high straightening
Flow current transmission valve fault current experimental rig and its test method.
Background technology
High voltage dc transmission technology is used as a kind of efficient transmission of electricity approach, and more and more extensive is applied in power system,
And significantly change the structure of power transmission network, improve the performance of power network.With HVDC transmission system voltage and transmission capacity
Improve, the reliability of its key equipment --- DC converter valve becomes particularly important, and particularly it bears various under fault case
Excess current, voltage, the ability of thermal stress.The necessary means for examining and improving converter valve reliability are exactly to carry out pattern examination to it
Test.In converter valve type approval test, the main purpose of fault current experiment is that examination valve bears maximum electricity caused by short circuit current
The ability of stream, voltage and temperature stress effect.Current several big converter valve suppliers carry out DC converter using synthetic method
Valve operating test, its basic thought be using several independent power-supply systems be respectively converter valve provide heated current, failure electricity
Stream and high-voltage strength, its advantage are to substantially reduce experiment power supply capacity, save great amount of investment.
The content of the invention
In view of the shortcomings of the prior art, it is an object of the invention to provide a kind of examination of high voltage direct current transmission converter valve fault current
Experiment device and its test method, the present invention make full use of superposition circuit theory, improve the utilization ratio of device, save cost,
Test method can realize the large-scale regulation of fault current, disclosure satisfy that conventional high-pressure DC engineering and extra-high voltage direct-current work
Journey converter valve fault current test requirements document, versatility are good.Test method makes full use of superposition circuit theory, make its with actual work
Under conditions of journey current peak is equal, fault current intensity I2T is closer to actual operating mode.
The purpose of the present invention is realized using following technical proposals：
The present invention provides a kind of failure current test apparatus for high voltage DC transmission converter valve, and described device includes in parallel successively
High voltage circuit, test product valve and DC current return, fault current loop is connected with high voltage circuit and test product valve Vt respectively；
It thes improvement is that the fault current loop includes auxiliary valve, reactor, capacitor, charging equipment and switches set；It is described
Auxiliary valve includes auxiliary valve V61, V62, V63, V71, V72 and V73；Reactor Lr1, Lr2 of the reactor including parallel connection,
Lr3, Lr11, Lr21 and Lr31；The capacitor includes capacitor Cr1, Cr2, Cr3, Cr11, Cr21 and Cr31 in parallel；Institute
State capacitor Cr1 and reactor Lr1 and be composed in series Cr1-Lr1 series arms；The capacitor Cr2 connects group with reactor Lr2
Into Cr2-Lr2 series arms；The capacitor Cr3 and reactor Lr3 is composed in series Cr3-Lr3 series arms；The Cr1-Lr1
Series arm, Cr2-Lr2 series arms and Cr3-Lr3 series arms correspond to respectively passes through auxiliary valve V61, V62 and V63 and test product
Valve Vt connections；The auxiliary valve V71, capacitor Cr11 and reactor Lr11 are composed in series V71-Cr11-Lr11 series arms；Institute
State auxiliary valve V72, capacitor Cr21 and reactor Lr21 and be composed in series V72-Cr21-Lr21 series arms；The auxiliary valve
V73, capacitor Cr31 and reactor Lr31 are composed in series V73-Cr31-Lr31 series arms；The V71-Cr11-Lr11 series connection
Branch road, V72-Cr21-Lr21 series arms and V73-Cr31-Lr31 series arms correspond to respectively by auxiliary valve V61, V62 and
V63 is connected with test product valve Vt；The charging equipment respectively with switches set and Cr1-Lr1 series arms, Cr2-Lr2 series arms,
Cr3-Lr3 series arms, V71-Cr11-Lr11 series arms, V72-Cr21-Lr21 series arms and V73-Cr31-Lr31 strings
Join branch road connection, switches set includes switch S1, S2 and S3, and described switch S1, S2 and S3 correspond to branch of being connected with Cr1-Lr1 respectively
Road, Cr2-Lr2 series arms connect with Cr3-Lr3 series arms.
Further, the high voltage circuit includes direct voltage source, capacitor C, capacitor C0, reactor L1, L2 and
L3, auxiliary valve V1 and auxiliary valve group, the reactor L1 and auxiliary valve group are composed in series L1- auxiliary valve group series arms；It is described
Reactor L3, auxiliary valve V1 and reactor L2 are sequentially connected composition L3-V1-L2 series arms；The direct voltage source, capacitor
C0, capacitor C and test product valve Vt it is in parallel；The L3-V1-L2 series arms are connected to capacitor C0Between capacitor C；It is described
L1- auxiliary valve group series arms are connected between capacitor and test product valve Vt；The auxiliary valve group includes antiparallel auxiliary valve
V21 and V22；The direct voltage source, capacitor C0It is grounded with capacitor C.
Further, the DC current return includes switch S, auxiliary valve V5 and DC current source；The DC current
Source is in parallel with test product valve Vt；It is connected to after switch S and auxiliary valve the V5 series connection between DC current source and test product valve Vt.
Further, the fault current loop is alternating voltage resource loop.
The present invention also provides a kind of test method of failure current test apparatus for high voltage DC transmission converter valve, and it improves it
It is in methods described comprises the steps：
(1) direct voltage source is coordinated by auxiliary valve V1, V21 and V22 triggering logical sequence, in capacitor C0, electric capacity
Under the vibration for the oscillation circuit that device C, reactor L1, L2 and L3 are formed coordinates, produce high voltage and put on test product valve Vt；
(2) fault current resource loop gives shunt capacitor Cr1, Cr2, Cr3, Cr11, Cr21 and Cr31 by charging equipment
Charging, shunt capacitor Cr1, Cr2, Cr3 and reactor Lr1, Lr2, Lr3 correspond to by auxiliary valve V61, V62, V63 respectively
Open to test product valve Vt and apply electric current, the electric current and shunt capacitor Cr11, Cr21, Cr31 and reactor Lr11, Lr21, Lr31
Current half wave cycle of oscillation fault current superposition collective effect is introduced in test product valve Vt by triggering auxiliary valve V71, V72 and V73
On, realize the experiment of unicast time fault current and more ripples without the follow-up locking time fault current of the follow-up locking of direct-current transmission converter valve
Experiment.
Further, the unicast time fault current experiment of the follow-up locking comprises the steps：
A, experimental rig wiring is completed, electricity on experimental rig；
B, t0 time triggers auxiliary valve V61, test product valve Vt introduce fault current I1；
C, t1 time triggers auxiliary valve V71, current half wave cycle of oscillation 4ms, peak current value 10kA failure electricity are introduced
Flow I2, fault current I1And I2Collective effect is superimposed on test product valve Vt；
D, the t2 moment introduces the half-wave current of high voltage circuit, and triggering auxiliary valve V21, reactor L1 and capacitor C is common
Produce resonance current；
E, the t3 moment isolates auxiliary valve V61 half-wave current zero passages, and t2~t3 moment bears to come from fault current discharge capacity
Device Cr1 negative voltage and turn off；
F, t4 moment half-wave currents zero passage becomes negative, and test product valve Vt is by triggering auxiliary valve V22, the electricity in high voltage circuit
Container C voltage is all applied on test product valve Vt；
G, t5 time triggers auxiliary valve V1 and V21, test product valve Vt voltage become positive with capacitor C voltage, follow-up locking
Unicast time fault current off-test.
Further, the experiment of more ripples without follow-up locking time fault current comprises the steps：
1. experimental rig wiring is completed, electricity on experimental rig；
2. t0 time triggers auxiliary valve V61, test product valve Vt introduce fault current I1；
3. t1 time trigger auxiliary valve V71, introduce current half wave cycle of oscillation 4ms, peak current value 10kA failure electricity
Flow I2, fault current I1And I2Collective effect is superimposed on test product valve Vt；
4. the t2 moment introduces the half-wave current of high voltage circuit, triggering auxiliary valve V21, reactor L1 and capacitor C is common
Produce resonance current；
5. t3 moment half-wave currents zero passage becomes negative, test product valve Vt is by triggering auxiliary valve V22, the electric capacity of high voltage circuit
Device C voltage is all applied on test product valve Vt；
6. t4 time trigger V1, but auxiliary valve V21 is not triggered, the capacitor C voltage of high voltage circuit becomes forward voltage again,
Terminate first wave time fault current.
Compared with the prior art, the beneficial effect that reaches of the present invention is：
1st, the present invention provides failure current test apparatus for high voltage DC transmission converter valve and its test method, the test method
Using synthetic test method, coordinated by a series of triggering of auxiliary valves, failure high current and high voltage pressure order are put on
Direct-current transmission converter valve is tested, subject converter valve is resistant to the transient current suitable with physical fault operating mode, heat, voltage stress,
The experiment for being tested valve accident operating condition is examined so as to realize.Failure high current part using superposition loop, make its with
Under conditions of Practical Project current peak is equal, fault current intensity I 2t is closer to actual operating mode.In addition current source is adopted
Electricity container impulse electricity pattern, so its output current value can be changed by adjuster charging voltage, to realize failure electricity
That flows is flexible adjustable, can meet different voltage levels direct current power transmission engineering converter valve experiments needs, strengthens equipment applicability.
2nd, the present invention makes full use of superposition circuit theory, improves the utilization ratio of device, saves cost, test method can
To realize the large-scale regulation of fault current, conventional high-pressure DC engineering and the event of extra-high voltage direct-current engineering converter valve disclosure satisfy that
Hinder current testing requirement, versatility is good.
Brief description of the drawings
Fig. 1 is the topology diagram of failure current test apparatus for high voltage DC transmission converter valve provided by the invention；
Fig. 2 is the unicast time fault current test waveform figure of follow-up locking provided by the invention；
Fig. 3 is more ripples provided by the invention without follow-up locking time fault current test waveform figure.
Embodiment
The embodiment of the present invention is described in further detail below in conjunction with the accompanying drawings.
The topology diagram of failure current test apparatus for high voltage DC transmission converter valve provided by the invention as shown in figure 1,
Experimental rig includes high voltage circuit, test product valve and DC current return in parallel successively, and fault current loop is electric with height respectively
Road is pushed back to connect with test product valve Vt；Characterized in that, the fault current loop includes auxiliary valve, reactor, capacitor, charging
Equipment and switches set；The auxiliary valve includes auxiliary valve V61, V62, V63, V71, V72 and V73；The reactor includes parallel connection
Reactor Lr1, Lr2, Lr3, Lr11, Lr21 and Lr31；The capacitor include capacitor Cr1, Cr2 in parallel, Cr3,
Cr11, Cr21 and Cr31；The capacitor Cr1 and reactor Lr1 is composed in series Cr1-Lr1 series arms；The capacitor Cr2
Cr2-Lr2 series arms are composed in series with reactor Lr2；The capacitor Cr3 and reactor Lr3 is composed in series Cr3-Lr3 strings
Join branch road；The Cr1-Lr1 series arms, Cr2-Lr2 series arms and Cr3-Lr3 series arms correspond to respectively passes through auxiliary valve
V61, V62 and V63 are connected with test product valve Vt；The auxiliary valve V71, capacitor Cr11 and reactor Lr11 are composed in series V71-
Cr11-Lr11 series arms；The auxiliary valve V72, capacitor Cr21 and reactor Lr21 are composed in series V72-Cr21-Lr21 strings
Join branch road；The auxiliary valve V73, capacitor Cr31 and reactor Lr31 are composed in series V73-Cr31-Lr31 series arms；It is described
V71-Cr11-Lr11 series arms, V72-Cr21-Lr21 series arms and V73-Cr31-Lr31 series arms correspond to logical respectively
Auxiliary valve V61, V62 and V63 is crossed to be connected with test product valve Vt；The charging equipment respectively with switches set and Cr1-Lr1 series arms,
Cr2-Lr2 series arms, Cr3-Lr3 series arms, V71-Cr11-Lr11 series arms, V72-Cr21-Lr21 series arms and
V73-Cr31-Lr31 series arms connect, switches set include switch S1, S2 and S3, it is described switch S1, S2 and S3 respectively correspond to
Cr1-Lr1 series arms, Cr2-Lr2 series arms connect with Cr3-Lr3 series arms.Fault current loop is alternating-current voltage source
Loop.
High voltage circuit includes direct voltage source, capacitor C, capacitor C0, reactor L1, L2 and L3, auxiliary valve V1 and
Valve group is aided in, the reactor L1 and auxiliary valve group are composed in series L1- auxiliary valve group series arms；The reactor L3, auxiliary
Valve V1 and reactor L2 is sequentially connected composition L3-V1-L2 series arms；The direct voltage source, capacitor C0, capacitor C and
Test product valve Vt is in parallel；The L3-V1-L2 series arms are connected to capacitor C0Between capacitor C；The L1- aids in valve group
Series arm is connected between capacitor and test product valve Vt；The auxiliary valve group includes antiparallel auxiliary valve V21 and V22；Institute
State direct voltage source, capacitor C0It is grounded with capacitor C.
DC current return includes switch S, auxiliary valve V5 and DC current source；；The DC current source and test product valve Vt
It is in parallel；It is connected to after switch S and auxiliary valve the V5 series connection between DC current source and test product valve Vt.
The present invention also provides a kind of test method of failure current test apparatus for high voltage DC transmission converter valve, including following
Step：
(1) direct voltage source is coordinated by auxiliary valve V1, V21, V22 triggering logical sequence, in capacitor C0, capacitor
C, under the vibration of the oscillation circuit of reactor L1, reactor L2 and reactor L3 compositions coordinates, produce high voltage and put on test product
On valve Vt；
(2) fault current resource loop gives shunt capacitor Cr1, Cr2, Cr3, Cr11, Cr21 and Cr31 by charging equipment
Charging, shunt capacitor Cr1, Cr2, Cr3 and reactor Lr1, Lr2, Lr3 correspond to by auxiliary valve V61, V62, V63 respectively
Open to test product valve Vt and apply electric current, the electric current and shunt capacitor Cr11, Cr21, Cr31 and reactor Lr11, Lr21, Lr31
Current half wave cycle of oscillation fault current superposition collective effect is introduced in test product valve Vt by triggering auxiliary valve V71, V72 and V73
On, realize the experiment of unicast time fault current and more ripples without the follow-up locking time fault current of the follow-up locking of direct-current transmission converter valve
Experiment.
(1) experiment of the unicast of follow-up locking time fault current comprises the steps：
A, experimental rig wiring is completed, electricity on experimental rig；
B, t0 time triggers auxiliary valve V61, test product valve Vt introduce fault current I1；
C, t1 time triggers auxiliary valve V71, current half wave cycle of oscillation 4ms, peak current value 10kA failure electricity are introduced
Flow I2, fault current I1And I2Collective effect is superimposed on test product valve Vt；
D, the t2 moment introduces the half-wave current of high voltage circuit, and triggering auxiliary valve V21, reactor L1 and capacitor C is common
Produce resonance current；
E, the t3 moment isolates auxiliary valve V61 half-wave current zero passages, and t2~t3 moment bears to come from fault current discharge capacity
Device Cr1 negative voltage and turn off；
F, t4 moment half-wave currents zero passage becomes negative, and test product valve Vt is by triggering auxiliary valve V22, the electricity in high voltage circuit
Container C voltage is all applied on test product valve Vt；
G, t5 time triggers auxiliary valve V1 and V21, test product valve Vt voltage become positive with capacitor C voltage, follow-up locking
Unicast time fault current off-test.The unicast time fault current test waveform figure of follow-up locking is as shown in Figure 2.
(2) experiment of three ripples without follow-up locking time fault current comprises the steps：
1. experimental rig wiring is completed, electricity on experimental rig；
2. t0 time triggers auxiliary valve V61, test product valve Vt introduce fault current I1；
3. t1 time trigger auxiliary valve V71, introduce current half wave cycle of oscillation 4ms, peak current value 10kA failure electricity
Flow I2, fault current I1And I2Collective effect is superimposed on test product valve Vt；
4. the t2 moment introduces the half-wave current of high voltage circuit, triggering auxiliary valve V21, reactor L1 and capacitor C is common
Produce resonance current；
5. t3 moment half-wave currents zero passage becomes negative, test product valve Vt is by triggering auxiliary valve V22, the electric capacity of high voltage circuit
Device C voltage is all applied on test product valve Vt；
6. t4 time trigger auxiliary valve V1, but auxiliary valve V21 is not triggered, the capacitor C voltage of high voltage circuit becomes again just
To voltage, terminate first wave time fault current, the second ripple time fault current is substantially with first wave, and the 3rd ripple time fault current is not
V2 valves are triggered again, i.e., are not re-introduced into high voltage circuit, off-test.More ripples without follow-up locking time fault current test waveform figure
As shown in Figure 3.
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
The present invention is described in detail with reference to above-described embodiment for pipe, those of ordinary skills in the art should understand that：Still
The embodiment of the present invention can be modified or equivalent substitution, and without departing from any of spirit and scope of the invention
Modification or equivalent substitution, it all should cover among scope of the presently claimed invention.
Claims (7)
1. a kind of failure current test apparatus for high voltage DC transmission converter valve, described device includes high voltage in parallel successively and returned
Road, test product valve and DC current return, fault current loop are connected with high voltage circuit and test product valve Vt respectively；Its feature exists
In the fault current loop includes auxiliary valve, reactor, capacitor, charging equipment and switches set；The auxiliary valve includes auxiliary
Help valve V61, V62, V63, V71, V72 and V73；The reactor includes reactor Lr1, Lr2, Lr3, Lr11, Lr21 in parallel
And Lr31；The capacitor includes capacitor Cr1, Cr2, Cr3, Cr11, Cr21 and Cr31 in parallel；The capacitor Cr1 with
Reactor Lr1 is composed in series Cr1-Lr1 series arms；The capacitor Cr2 is composed in series Cr2-Lr2 with reactor Lr2 and connected
Branch road；The capacitor Cr3 and reactor Lr3 is composed in series Cr3-Lr3 series arms；The Cr1-Lr1 series arms, Cr2-
Lr2 series arms and Cr3-Lr3 series arms correspond to respectively to be connected by auxiliary valve V61, V62 and V63 with test product valve Vt；It is described
Auxiliary valve V71, capacitor Cr11 and reactor Lr11 are composed in series V71-Cr11-Lr11 series arms；The auxiliary valve V72,
Capacitor Cr21 and reactor Lr21 is composed in series V72-Cr21-Lr21 series arms；The auxiliary valve V73, capacitor Cr31
V73-Cr31-Lr31 series arms are composed in series with reactor Lr31；The V71-Cr11-Lr11 series arms, V72-Cr21-
Lr21 series arms and V73-Cr31-Lr31 series arms correspond to respectively to be connected by auxiliary valve V61, V62 and V63 and test product valve Vt
Connect；The charging equipment respectively with switches set and Cr1-Lr1 series arms, Cr2-Lr2 series arms, Cr3-Lr3 series arms,
V71-Cr11-Lr11 series arms, V72-Cr21-Lr21 series arms connect with V73-Cr31-Lr31 series arms, switches set
Including switching S1, S2 and S3, described switch S1, S2 and S3 are corresponded to and Cr1-Lr1 series arms, Cr2-Lr2 series arms respectively
Connected with Cr3-Lr3 series arms.
2. fault current experimental rig as claimed in claim 1, it is characterised in that the high voltage circuit includes DC voltage
Source, capacitor C, capacitor C0, reactor L1, L2 and L3, auxiliary valve V1 and auxiliary valve group, the reactor L1 and auxiliary valve group
It is composed in series L1- auxiliary valve group series arms；The reactor L3, auxiliary valve V1 and reactor L2 are sequentially connected composition L3-V1-
L2 series arms；The direct voltage source, capacitor C0, capacitor C and test product valve Vt it is in parallel；The L3-V1-L2 series arms
It is connected to capacitor C0Between capacitor C；L1- auxiliary valve group series arm be connected to capacitor and test product valve Vt it
Between；The auxiliary valve group includes antiparallel auxiliary valve V21 and V22；The direct voltage source, capacitor C0It is equal with capacitor C
Ground connection.
3. fault current experimental rig as claimed in claim 1, it is characterised in that the DC current return include switch S,
Auxiliary valve V5 and DC current source；The DC current source is in parallel with test product valve Vt；Connect after switch S and auxiliary valve the V5 series connection
It is connected between DC current source and test product valve Vt.
4. fault current experimental rig as claimed in claim 1, it is characterised in that the fault current loop is alternating voltage
Resource loop.
A kind of 5. experiment of failure current test apparatus for high voltage DC transmission converter valve as any one of claim 1-4
Method, it is characterised in that methods described comprises the steps：
(1) direct voltage source is coordinated by auxiliary valve V1, V21 and V22 triggering logical sequence, in capacitor C0, capacitor C, electricity
Under the vibration of the oscillation circuit of anti-device L1, L2 and L3 composition coordinates, produce high voltage and put on test product valve Vt；
(2) fault current resource loop is charged by charging equipment to shunt capacitor Cr1, Cr2, Cr3, Cr11, Cr21 and Cr31,
Shunt capacitor Cr1, Cr2, Cr3 and reactor Lr1, Lr2, Lr3 correspond to respectively by auxiliary valve V61, V62, V63 open to
Test product valve Vt applies electric current, and shunt capacitor Cr11 and reactor Lr11 triggering auxiliary valves V71 introduce current half wave cycle of oscillation
Fault current, shunt capacitor Cr21 and reactor Lr21 triggerings auxiliary valve V72 introduce the failure of current half wave cycle of oscillation
Electric current, shunt capacitor Cr31 and reactor Lr31 triggering auxiliary valves V73 introduce the fault current of current half wave cycle of oscillation, should
Electric current is superimposed collective effect with the fault current of three current half wave cycles of oscillation on test product valve Vt, realizes direct-current transmission converter
The experiment of unicast time fault current and more ripples without follow-up locking time fault current experiment of the follow-up locking of valve.
6. test method as claimed in claim 5, it is characterised in that the unicast time fault current experiment bag of the follow-up locking
Include following step：
A, experimental rig wiring is completed, electricity on experimental rig；
B, t0 time triggers auxiliary valve V61, test product valve Vt introduce fault current I1；
C, t1 time triggers auxiliary valve V71, current half wave cycle of oscillation 4ms, peak current value 10kA fault current I are introduced2,
Fault current I1And I2Collective effect is superimposed on test product valve Vt；
D, the t2 moment introduces the half-wave current of high voltage circuit, and triggering auxiliary valve V21, reactor L1 and capacitor C are produced jointly
Resonance current；
E, the t3 moment isolates auxiliary valve V61 half-wave current zero passages, and t2~t3 moment bears to come from fault current discharge capacity device Cr1
Negative voltage and turn off；
F, t4 moment half-wave currents zero passage becomes negative, and test product valve Vt is by triggering auxiliary valve V22, the capacitor C in high voltage circuit
Voltage be all applied on test product valve Vt；
G, t5 time triggers auxiliary valve V1 and V21, test product valve Vt voltage become positive with capacitor C voltage, the list of follow-up locking
Ripple time fault current off-test.
7. test method as claimed in claim 5, it is characterised in that more ripples without follow-up locking time fault current experiment
Comprise the steps：
1. experimental rig wiring is completed, electricity on experimental rig；
2. t0 time triggers auxiliary valve V61, test product valve Vt introduce fault current I1；
3. t1 time trigger auxiliary valve V71, introduce current half wave cycle of oscillation 4ms, peak current value 10kA fault current I2,
Fault current I1And I2Collective effect is superimposed on test product valve Vt；
4. the t2 moment introduces the half-wave current of high voltage circuit, triggering auxiliary valve V21, reactor L1 and capacitor C are produced jointly
Resonance current；
5. t3 moment half-wave currents zero passage becomes negative, test product valve Vt is by triggering auxiliary valve V22, the capacitor C of high voltage circuit are electric
Pressure is all applied on test product valve Vt；
6. t4 time trigger auxiliary valve V1, but auxiliary valve V21 is not triggered, the capacitor C voltage of high voltage circuit becomes positive electricity again
Pressure, terminate first wave time fault current, the second ripple time fault current is substantially the same as first wave.
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