CN1614841A - Method for protecting superconductive cable - Google Patents
Method for protecting superconductive cable Download PDFInfo
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- CN1614841A CN1614841A CN 200410061196 CN200410061196A CN1614841A CN 1614841 A CN1614841 A CN 1614841A CN 200410061196 CN200410061196 CN 200410061196 CN 200410061196 A CN200410061196 A CN 200410061196A CN 1614841 A CN1614841 A CN 1614841A
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Abstract
The method uses three protective strategies. When the current in the cable is less than minimum quench current, the protection is made by monitoring temperature rise, flow rate and pressure at the both ends of cable. When the current in the cable is between the minimum quench current and limited failure current, the protection is made by calculating the heat accumulation in superconducting cable. When the current in cable is more than the limiting current, no time delay trip is made.
Description
Technical field
The invention belongs to electrical technology field, be specifically related to a kind of hyperconductive cable guard method, be particularly useful for the hyperconductive cable quench protection under the short-circuit conditions.
Background technology
To forward normal state to from superconducting state after the hyperconductive cable quench, will have a negative impact the hyperconductive cable body.The quench detection of hyperconductive cable and protection are to need one of key technical problem of emphasis solution in the hyperconductive cable practicability process.The detection of at present relevant hyperconductive cable quench is mainly based on non-electric quantity, comprise temperature, pressure, flow velocity and ultrasound examination etc. (see the analogy little gorgeous, Li Jingdong, Tang Yuejin. the basic research of Quench Detection in Superconducting Electric Equipments. Chinese engineering science, 2003, the 5th volume, the 10th phase, 73 pages, 77 pages).The required number of sensors of non-electric quantity detection method is more, and is difficult in time reflect the sudden quench of the hyperconductive cable that is caused by short circuit current in the electrical network, if the quench duration is long, will seriously jeopardize the safe operation of hyperconductive cable.
Summary of the invention
The objective of the invention is to overcome above-mentioned weak point, a kind of new hyperconductive cable guard method is provided.This method can overcome simple non-electric quantity detection method to the slow shortcoming of short circuit current reaction, improves the reliability and the accuracy that detect, for the safe operation of hyperconductive cable provides a kind of reliable assurance.
A kind of hyperconductive cable guard method provided by the invention comprises the steps:
(1) setting value is set, comprises: territory setting value Δ T is got in temperature rise
Set, flow is on the low side setting value L
Set, inlet temperature is got over territory setting value T
Set, pressure differential is got over territory setting value Δ P
Set, definite time protection time-delay definite value t
Set, lower current limit setting value I
Low, limiting current setting value I
Set, heat history amount setting value θ
Set, heat history delay counter definite value T
Delay
(2) gather hyperconductive cable three-phase current and calculate its real effective I
a, I
b, I
cGather the instantaneous value of gateway temperature, liquid nitrogen flow, liquid nitrogen pressure, inlet and outlet pressure, and calculate the following mean value of acquisition: the inlet temperature T of threephase cable
Aln, T
Bln, T
Cln, the outlet temperature T of threephase cable
AOut, T
BOut, T
COut, the liquid nitrogen flow L of threephase cable
a, L
b, L
c, three-phase liquid nitrogen pressure P
a, P
b, P
cCalculate the temperature rise calculated value Δ T of threephase cable again
a, Δ T
b, Δ T
c, hyperconductive cable import and export pressure differential calculating value Δ P, three-phase hyperconductive cable heat history amount Q
a, Q
b, Q
c
(3) each variate-value is judged, and definite protected mode:
(3.1) hyperconductive cable temperature, pressure, flow signal detect:
(A) judge whether following formula (a1)-(a4) satisfies, if wherein there is arbitrary condition to satisfy, then tripping operation is protected at once, forwards step (2) again to; Otherwise, continue to carry out following step;
(ΔT
a≥ΔT
set)∪(ΔT
b≥ΔT
set)∪(ΔT
c≥ΔT
set) (a1)；
(T
aln≥T
set)∪(T
blm≥T
set)∪(T
cln≥T
set) (a2)
(L
a≥L
set)∪(L
b-≥L
set)∪(L
c≥L
set) (a3)
(ΔP≥ΔP
set) (a4)
(B) judge whether following formula (b1)-(b4) satisfies, if wherein there is arbitrary condition to satisfy, then tripping operation is protected at once, forwards step (2) again to; Otherwise, continue to carry out following step;
((T
aln≥T
Dset)∪(T
bln≥T
Dset)∪(T
cln≥T
Dset))∩(t≥t
set) (b1)
((ΔT
a≥ΔT
Dset)∪(ΔT
b≥ΔT
Dset)∪(ΔT
c≥ΔT
Dset))∩(t≥t
set) (b2)
((L
a≥L
Dset)∪(L
b≥L
Dset)∪(L
c≥L
Dset))∩(t≥t
set) (b3)
((ΔP≥ΔP
Dset))∩(t≥t
set) (b4)
(3.2) as the satisfied (I of hyperconductive cable three-phase current
a＜I
Low) ∪ (I
b＜I
Low) ∪ (I
c＜I
Low) time, according to (A) and (B) judge and handle, start heat history and return delay counter; If heat history returns the delay counter value and reaches heat history and return delay counter definite value T
Delay, with heat history amount Q
a, Q
b, Q
cResult of calculation and the zero clearing of heat history delay counter;
(3.3) as (I
Low≤ I
a＜I
Set) ∪ (I
Low≤ I
b＜I
Set) ∪ (I
Low≤-I
c＜I
Set) time, according to formula
Calculate the heat accumulation of hyperconductive cable inside, detect judgement: if (Q
a〉=θ
Set) ∪ (Q
b〉=θ
Set) ∪ (Q
c〉=θ
Set), the protection would trip goes back to step (2); If heat accumulation Q does not reach default heat history amount setting value θ
Set, continue accumulation, carry out following step;
(3.4) as satisfied (I
a〉=I
Set) ∪ (I
b〉=I
Set) ∪ (I
c〉=I
Set) time, protect no deferred action tripping operation; Otherwise, continue to carry out following step;
(4) forward step (2) to, finish until task.
The invention has the advantages that:
(1) adopts different protection strategies according to the hyperconductive cable size of current; fully utilized electric parameters (being the hyperconductive cable three-phase current) and the separately advantage of non-electric quantity in quench detection, can effectively overcome slow merely based on the quench detection method response speed of non-electric quantity, be difficult to because the defective that the quench fault that short circuit current causes is effectively protected.
(2) adopt different protection strategies according to the short circuit current size, can when catastrophe failure, excise hyperconductive cable fast, guarantee hyperconductive cable safety.And under the glitch current conditions, can under the prerequisite of guaranteeing the hyperconductive cable security of operation, avoid the unnecessary frequent excision of hyperconductive cable, improve its power supply reliability.
(3) adopt supercurrent to carry out quench detection, response speed is fast, and the reliability height is practical.
(4) the quench detection scheme that is proposed mainly utilizes the port identity of hyperconductive cable to carry out, and can simplify number of sensors, and is easy for installation, and leakage heat is little, is convenient to engineering and uses.
Description of drawings
Fig. 1 is the structural representation of the layering guard method of the present invention's employing.
Embodiment
The present invention adopts three layers of different protection strategy according to the size of hyperconductive cable electric current, promptly when cable current during less than the quench electric current, mainly utilizes hyperconductive cable temperature, pressure, flow signal to realize protecting; When electric current during less than limiting current, is realized inverse time lag excessive protection according to the heat accumulation of hyperconductive cable inside greater than the quench electric current; When cable current during, protect no delay tripping greater than limiting current.
The setting value that the present invention relates to two keys calculates: limiting current setting value I
SetWith heat history amount setting value θ
SetConcrete structure according to hyperconductive cable can have different calculating and method to set up with cooling condition.Following act one example is illustrated.
(1) limiting current setting value I
SetCalculate
Because no time limit protection quick action is so its action definite value " limiting current setting value " is determined by adiabatic, current-sharing.Minimum temperature superconducting conductor maximum temperature allowed to bear when determining the limiting current value in the temperature of the temperature that can bear with insulating material, temperature that the performance generation essence that causes superconductor changes, superconducting tape generation destructive lesion.
The heat balance process of institute's foundation is in the calculating, and mainly by the money base shunting, the heating of money base is a thermal source after the cable quench, and money base and superconductor are jointly as absorber.Corresponding differential formulas is as follows:
ρ in the formula
AgBe the resistivity of silver, d
AgBe the density of silver, A
AgBe the sectional area of money base, C
AgBe the specific heat of silver, d
HtsBe the density of superconducting wire, A
HtsBe the sectional area of superconducting wire, C
HtsBe the specific heat of superconducting wire, i is a cable current.Adopt the improvement Euler method to separate this differential equation, can obtain the relation curve of θ-i, getting θ is the maximum temperature (by the design parameter decision of hyperconductive cable body) that hyperconductive cable allows, and just obtains limiting current setting value I
Set
(2) heat history amount setting value θ
SetCalculate
Computation model is identical with the model that the calculating of limiting current setting value is adopted, heat history amount setting value
Computing formula as follows:
ρ in the formula
AgBe the resistivity of silver, d
AgBe the density of silver, A
AgBe the sectional area of money base, C
AgBe the specific heat of silver, d
HtsBe the density of superconducting wire, A
HtsBe the sectional area of superconducting wire, C
HtsBe the specific heat of superconducting wire,
T0Be the initial temperature (the normal stable operation temperature of power taking cable is as 73K) of hyperconductive cable,
Δ TThe maximum that is hyperconductive cable allows temperature rise (by the design parameter decision of hyperconductive cable body).
The present invention need be provided with setting value earlier, comprising: territory setting value Δ T is got in temperature rise
Set, flow is on the low side setting value L
Set, inlet temperature is got over territory setting value T
Set, pressure differential is got over territory setting value Δ P
Set, definite time protection time-delay definite value t
Set, lower current limit setting value I
Low, limiting current setting value I
Set, heat history amount setting value θ
Set, heat history delay counter definite value T
Delay
The present invention need gather the hyperconductive cable three-phase current and calculate its real effective I
a, I
b, I
cAlso need gather the instantaneous value of gateway temperature, liquid nitrogen flow, liquid nitrogen pressure, inlet and outlet pressure, and calculate the following mean value of acquisition: the inlet temperature T of threephase cable
Aln, T
Bln, T
Cln, the outlet temperature T of threephase cable
AOut, T
BOut, T
COut, the liquid nitrogen flow L of threephase cable
a, L
b, L
c, three-phase liquid nitrogen pressure P
a, P
b, P
cObtain the temperature rise calculated value Δ T of threephase cable according to above-mentioned mean value calculation
a, Δ T
b, Δ T
c, hyperconductive cable import and export pressure differential calculating value Δ P, three-phase hyperconductive cable heat history amount Q
a, Q
b, Q
c
The above-mentioned variate-value that needs to gather all can adopt acquisition, the setting value of required setting.
The present invention is according to the hyperconductive cable size of current, and guard method is divided into as shown in Figure 1 three layers.
One, I level:
The corresponding cable of the protection of this level from error protection, comprise high A.C.power loss and cooling system failure etc.When the hyperconductive cable current i less than lower current limit setting value I
LowBe i＜I
Low(wherein i is a cable current, I
LowBe the lower limit setting value of electric current, value is the critical current of hyperconductive cable here) time, carry out the protection of I level.If handling the calculating of hyperconductive cable heat history amount, stop to calculate before, and start the relevant delay counter that returns; If delay time arrives, heat history amount result of calculation and heat history time-delay are returned counter O reset.
The variation of the main temperature rise by monitoring cable two ends of this layer protection, inlet temperature, flow, pressure differential is protected, and comprises various non-electric quantity fast tripping protections and definite time protection, and concrete criterion is as follows:
(1) fast tripping protection
(1) to get over territory fast tripping protection operating criterion be (Δ T in temperature rise
a〉=Δ T
Set) ∪ (Δ T
b〉=Δ T
Set) ∪ (Δ T
c〉=Δ T
Set), Δ T wherein
a, Δ T
b, Δ T
cBe respectively threephase cable temperature rise calculated value, Δ T
SetFor the territory setting value is got in temperature rise.
(2) to get over territory fast tripping protection operating criterion be (T to inlet temperature
a〉=T
Set) ∪ (T
b〉=T
Set) ∪ (T
c〉=T
Set), T wherein
a, T
b, T
cBe respectively threephase cable inlet temperature measured value, T
SetFor temperature is got over the territory setting value.
(3) flow fast tripping protection operating criterion on the low side is (L
a〉=L
Set) ∪ (L
b〉=L
Set) ∪ (L
c〉=L
Set), L wherein
a, L
b, L
cBe respectively the threephase cable flow measurements, L
SetBe flow setting value on the low side.
(4) to get over territory fast tripping protection operating criterion be (Δ P 〉=Δ P to pressure differential
Set), wherein Δ P is a hyperconductive cable import and export pressure differential calculating value, Δ P
SetFor pressure differential is got over the territory setting value.
If one of above-mentioned condition satisfies, then tripping operation is protected at once; If above-mentioned condition does not satisfy, carry out following definite time protection and judge.
(2) definite time protection
(1) to get over territory definite time protection operating criterion be ((T to inlet temperature
a〉=T
Dset) ∪ (T
b〉=T
Dset) ∪ (T
c〉=T
Dset)) ∩ (t 〉=t
Set), T wherein
a, T
b, T
cBe respectively threephase cable inlet temperature measured value, T
DsetFor the definite time protection temperature is got over territory definite value, t
SetBe definite time protection time-delay definite value.
(2) to get over territory definite time protection operating criterion be ((Δ T in temperature rise
a〉=Δ T
Dset) ∪ (Δ T
b〉=Δ T
Dset) ∪ (Δ T
c〉=Δ T
Dset)) ∩ (t 〉=t
Set), Δ T wherein
a, Δ T
b, Δ T
cBe respectively threephase cable temperature rise calculated value, Δ T
DsetFor territory definite value, t are got in the definite time protection temperature rise
SetBe protection time-delay definite value.
(3) operating criterion of flow definite time protection on the low side is ((L
a〉=L
Dset) ∪ (L
b〉=L
Dset) ∪ (L
c〉=L
Dset)) ∩ (t 〉=t
Set), L wherein
a, L
b, L
cBe respectively the threephase cable flow measurements, L
DsetBe definite time protection flow definite value on the low side, t
SetBe protection time-delay definite value.
(4) to get over the operating criterion of territory definite time protection be ((Δ P 〉=Δ P to pressure reduction
Dset)) ∩ (t 〉=t
Set), wherein Δ P is a hyperconductive cable import and export pressure differential calculating value, Δ P
DsetFor the definite time protection pressure differential is got over territory definite value, t
SetBe protection time-delay definite value.
If one of above-mentioned condition satisfies, tripping operation is protected; If not, continue to carry out following step.
Fast tripping protection and definite time protection generally need to drop into simultaneously in device, and the setting value of fast tripping protection must be greater than the setting value of corresponding definite time protection to guarantee the selectivity of these two kinds of protections.This is because continue operation a period of time t when the non-electric quantity signal departs from normal value than a hour permission hyperconductive cable
Set, need not excise cable, so be at this moment by definite time protection protection cable at once; And the non-electric quantity signal departs from normal value when big, can have a strong impact on hyperconductive cable safety, so must lean on fast tripping protection excise cable at once.
Two, II level:
II level protection is corresponding be cable current at minimum quench electric current with than the protection between the major break down electric current, i.e. I
Low≤ i＜I
SetThe time protection.Its basic criterion is (Q 〉=Q
Set), wherein Q is a hyperconductive cable heat history amount calculated value, Q
SetBe heat history amount setting value.This layer protection trip time has anti-time limit characteristic, i.e. heating is serious more, and the trip time is short more.
When cable current surpasses the lower limit setting value of electric current and (I during less than the limiting current setting value
Low≤ i＜I
Set), obtain the root-mean-square value of cable current by the real-time sampling data, according to formula
The heat accumulation that calculates hyperconductive cable inside detects judgement.The general value of time0 is the initial moment of cable current greater than the lower limit setting value, and the time1 value is a current time.
Reach default heat history amount setting value θ if calculate the heat accumulation Q of gained
SetThe time, the protection would trip; If heat accumulation Q does not reach default heat history amount setting value θ
Set, continue accumulation, continue to carry out following step.
Three, III level:
The corresponding serious short trouble situation of the protection of III level, this moment, the time of cable tolerance overcurrent was short, need excise cable as early as possible because short circuit current is big.The protection strategy of taking is, as arbitrary phase hyperconductive cable electric current current setting I that oversteps the extreme limit
SetThe time (i 〉=I
Set), protect no deferred action tripping operation.Operating criterion is: (I
a〉=I
Set) ∪ (I
b〉=I
Set) ∪ (I
c〉=I
Set).I wherein
a, I
b, I
cBe respectively the hyperconductive cable three-phase current, I
SetBe the limiting current setting value.
Claims (1)
1, a kind of hyperconductive cable guard method comprises the steps:
(1) setting value is set, comprises: territory setting value Δ T is got in temperature rise
Set, flow is on the low side setting value L
Set, inlet temperature is got over territory setting value T
Set, pressure differential is got over territory setting value Δ P
SeT, definite time protection time-delay definite value t
Set, lower current limit setting value I
Low, limiting current setting value I
Set, heat history amount setting value θ
Set
(2) gather hyperconductive cable three-phase current and calculate its real effective I
a, I
b, I
cGather the instantaneous value of gateway temperature, liquid nitrogen flow, liquid nitrogen pressure, inlet and outlet pressure, and calculate the following mean value of acquisition: the inlet temperature T of threephase cable
AIn, T
BIn, T
CIn, the outlet temperature T of threephase cable
AOut, T
BOut, T
COut, the liquid nitrogen flow L of threephase cable
a, L
b, L
c, three-phase liquid nitrogen pressure P
a, P
b, P
cCalculate the temperature rise calculated value Δ T of threephase cable again
a, Δ T
b, Δ T
c, hyperconductive cable import and export pressure differential calculating value Δ P, three-phase hyperconductive cable heat history amount Q
a, Q
b, Q
c
(3) each variate-value is judged, and definite protected mode:
(3.1) hyperconductive cable temperature, pressure and flow signal detect:
(A) judge whether following formula (a1)-(a4) satisfies, if wherein there is arbitrary condition to satisfy, then tripping operation is protected at once, forwards step (2) to; Otherwise, continue to carry out following step;
(ΔT
a≥ΔT
set)∪(ΔT
b≥ΔT
set)∪(ΔT
c≥ΔT
set) (a1)；
(T
aIn≥T
set)∪(T
bIn≥T
set)∪(T
cIn≥T
set) (a2)
(L
a≥L
set)∪(L
b≥L
set)∪(L
c≥L
set) (a3)
(ΔP≥ΔP
set) (a4)
(B) judge whether following formula (b1)-(b4) satisfies, if wherein there is arbitrary condition to satisfy, then tripping operation is protected at once; Forward step (2) to; Otherwise, continue to carry out following step;
((T
aIn≥T
Dset)∪(T
bIn≥T
Dset)∪(T
cIn≥T
Dset))∩(t≥t
set) (b1)
((ΔT
a≥ΔT
Dset)∪(ΔT
b≥ΔT
Dset)∪(ΔT
c≥ΔT
Dset))∩(t≥t
set) (b2)
((L
a≥L
Dset)∪(L
b≥L
Dset)∪(L
c≥L
Dset))∩(t≥t
set) (b3)
((ΔP≥ΔP
Dset))∩(t≥t
set) (b4)
(3.2) as the satisfied (I of hyperconductive cable three-phase current
a＜I
Low) ∪ (I
b＜I
Low) ∪ (I
c＜I
Low) time, according to (A) and (B) judge and handle; Start delay counter, if delay time arrives, with heat history amount Q
a, Q
b, Q
cResult of calculation and the counter O reset of heat history delay time;
(3.3) as (I
Low≤ I
a＜I
Set) ∪ (I
Low≤ I
b＜I
Set) ∪ (I
Low≤ I
c＜I
Set) time, according to formula
Calculate the heat accumulation of hyperconductive cable inside, detect judgement: if (Q
a〉=θ
Set) ∪ (Q
b〉=θ
Set) ∪ (Q
c〉=θ
Set), the protection would trip goes back to step (2); If heat accumulation Q does not reach default heat history amount setting value θ
Set, continue accumulation, carry out following step;
(3.4) as satisfied (I
a〉=I
Set) ∪ (I
b〉=I
Set) ∪ (I
c〉=I
Set) time, protect no deferred action tripping operation; Otherwise, continue to carry out following step;
(4) forward step (2) to, finish until task.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100611961A CN100414799C (en) | 2004-11-26 | 2004-11-26 | Method for protecting superconductive cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100611961A CN100414799C (en) | 2004-11-26 | 2004-11-26 | Method for protecting superconductive cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1614841A true CN1614841A (en) | 2005-05-11 |
| CN100414799C CN100414799C (en) | 2008-08-27 |
Family
ID=34764454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100611961A Expired - Fee Related CN100414799C (en) | 2004-11-26 | 2004-11-26 | Method for protecting superconductive cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100414799C (en) |
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| CN101126787B (en) * | 2007-09-28 | 2010-06-09 | 中国科学院电工研究所 | Superconducting coil quench detection method |
| CN101233660B (en) * | 2005-07-29 | 2010-06-16 | 美国超导体公司 | Fault management of HTS power cable |
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| AU4286500A (en) * | 1999-05-17 | 2000-12-05 | Nkt Research A/S | A method for overcurrent protection in a superconducting cable |
| US6717781B2 (en) * | 2001-09-25 | 2004-04-06 | Ge Medical Systems Global Technology Company, Llc | Balanced quench protection circuit |
| JP2003164060A (en) * | 2001-11-20 | 2003-06-06 | Nisshin Denki Seisakusho:Kk | Protector for communication line |
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| CN101126787B (en) * | 2007-09-28 | 2010-06-09 | 中国科学院电工研究所 | Superconducting coil quench detection method |
| CN108695819A (en) * | 2017-03-30 | 2018-10-23 | 英飞凌科技股份有限公司 | Electrical fuse circuit and method for operating electronic switch |
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| CN107528287A (en) * | 2017-09-30 | 2017-12-29 | 华中科技大学 | The optimization method and system of a kind of inverse time-lag protection |
| CN107528287B (en) * | 2017-09-30 | 2018-12-28 | 华中科技大学 | A kind of optimization method and system of inverse time-lag protection |
| CN110071489A (en) * | 2019-04-15 | 2019-07-30 | 国电南瑞科技股份有限公司 | A kind of High temperature superconducting transmission route quenches differentiation, method for handover control and device |
| CN110880735A (en) * | 2019-12-20 | 2020-03-13 | 深圳供电局有限公司 | Self-starting method for superconducting cable of medium-voltage power distribution network |
| CN111934283B (en) * | 2020-07-30 | 2022-09-30 | 深圳供电局有限公司 | Superconducting cable fault self-recovery control method |
| CN111934283A (en) * | 2020-07-30 | 2020-11-13 | 深圳供电局有限公司 | Superconducting cable fault self-recovery control method |
| CN112564056A (en) * | 2020-12-02 | 2021-03-26 | 深圳供电局有限公司 | High-temperature superconducting cable fault protection system |
| CN112636466A (en) * | 2020-12-02 | 2021-04-09 | 深圳供电局有限公司 | Monitoring protection device and monitoring method for high-temperature superconducting cable |
| CN112564056B (en) * | 2020-12-02 | 2022-11-25 | 深圳供电局有限公司 | High-temperature superconducting cable fault protection system |
| CN112636466B (en) * | 2020-12-02 | 2023-10-31 | 深圳供电局有限公司 | Monitoring protection device and monitoring method for high-temperature superconducting cable |
| CN112747800A (en) * | 2020-12-30 | 2021-05-04 | 金卡智能集团股份有限公司 | Flow filtering method for metering instrument and metering instrument |
| CN112747800B (en) * | 2020-12-30 | 2024-04-05 | 金卡智能集团股份有限公司 | Flow filtering method for metering instrument and metering instrument |
| CN114583668A (en) * | 2022-03-31 | 2022-06-03 | 广东电网有限责任公司 | Superconducting cable protection method and device applied to power distribution network |
| CN114839488A (en) * | 2022-05-07 | 2022-08-02 | 上海超导科技股份有限公司 | System and method for judging overcurrent impact resistance of superconducting strip |
| CN114839488B (en) * | 2022-05-07 | 2022-12-09 | 上海超导科技股份有限公司 | System and method for judging overcurrent impact resistance of superconducting strip |
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