CN214539816U - Three-phase coaxial high-temperature superconducting cable through-flow test device - Google Patents
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- CN214539816U CN214539816U CN202022507791.0U CN202022507791U CN214539816U CN 214539816 U CN214539816 U CN 214539816U CN 202022507791 U CN202022507791 U CN 202022507791U CN 214539816 U CN214539816 U CN 214539816U
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Abstract
The utility model provides a coaxial high temperature superconducting cable through-flow test device of three-phase, test device includes electronic induction voltage regulator, low pressure heavy current generator, combined floodgate circuit breaker, current transformer, isolator, three-phase coaxial superconducting cable system, ground circuit breaker, analog load, earthing switch, control cabinet, synthesizes and observes and controls protection device. In this way, the utility model discloses except providing a coaxial superconducting cable trouble transient state through-flow test device of three-phase, still provide a coaxial superconducting cable trouble transient state through-flow test method of three-phase, guarantee that a whole set of test device can carry out the long-time heavy current steady state through-flow test of coaxial high temperature superconducting cable of three-phase and transient state heavy current transient state through-flow test to develop the synchronous monitoring of cable operating parameter. The utility model discloses possess safe reliability, extensive suitability and parameter controllability etc. and show the advantage.
Description
The technical field is as follows:
the utility model belongs to superconducting cable field, concretely relates to coaxial high temperature superconducting cable through-flow test device of three-phase.
Background art:
the urban power grid load is rapidly increased, and newly increased or expanded existing power transmission lines face the problems of saturated cable tunnel space, insufficient cable current-carrying capacity, overhigh land acquisition cost of newly increased substation power distribution facilities and the like, so that the distribution capacity of part of urban load centers faces the dilemma that the actual development requirements cannot be met. High temperature superconductors generally refer to materials that superconduct above the temperature of liquid nitrogen (77K), mainly copper-based oxides, and their superconducting critical transition temperatures are all higher than the vaporization temperature of liquid nitrogen (77.3K). The high-temperature superconducting cable manufactured by using the high-temperature superconducting material has great technical advantages in the aspect of realizing large-capacity power transmission in an underground cable system of an urban load center or in a specific environment, and can improve the power transmission capacity of an underground power grid in multiples, so that the contradiction between load increase and underground space limitation is solved, and the bottleneck of urban power transmission is broken.
The three-phase coaxial high-temperature superconducting cable is uneven in electromagnetic coupling among three-phase conductors due to the difference of phase structures, and the problem of phase-to-phase imbalance often occurs. When short-circuit current impact or asymmetric fault occurs to a line, because the superconductor is quenched to generate resistance and heat accumulation, the current of each phase in the three-phase coaxial cable is in a transfer distribution phenomenon, so that the induced current of a shielding layer, the voltage of the cable, equivalent parameters and the like can be changed; when the low temperature cooling environment and the cooling medium also malfunction or change, the continued rising temperature causes the superconducting cable to lose stability due to failure to remove the accumulated heat in time, and in severe cases, may even cause cable damage.
At present, the through-current test of the three-phase coaxial high-temperature superconducting cable is only limited to the rated through-current capability test under the three-phase symmetrical low-voltage high-current steady state. Because the three-phase fault operation environment is usually difficult to realize due to the limitation of high-capacity three-phase transmission capacity and true test capacity, the transient operation characteristic change rule of the three-phase coaxial high-temperature superconducting cable is lack of test research support, the test parameters cannot be comprehensively monitored and judged, and the theoretical analysis method is difficult to verify.
The utility model has the following contents:
the utility model aims at not enough and improvement demand of prior art, the utility model aims at providing a coaxial superconducting cable trouble transient state through-flow test device of three-phase, another purpose is to provide the coaxial superconducting cable steady state through-flow of three-phase and trouble transient state through-flow test method, the utility model discloses guarantee that a whole set of test device can carry out the long-time heavy current steady state through-flow test of coaxial high temperature superconducting cable of three-phase and transient state heavy current transient state through-flow test to develop cable test parameter synchronous monitoring.
The utility model aims at adopting the following technical scheme to realize:
a three-phase coaxial high-temperature superconducting cable through-flow test device comprises an electric induction voltage regulator 1, a low-voltage large-current generator 2, a closing circuit breaker 4, a current transformer 5, a disconnecting switch 6, a three-phase coaxial high-temperature superconducting cable system 7, a grounding circuit breaker 8, an analog load 9, a grounding switch 10, an up-flow control console 3 and a comprehensive measurement and control protection device 11;
the output end of the electric induction voltage regulator 1 is connected to the input end of the low-voltage large-current generator 2, and the electric induction voltage regulator 1 and the low-voltage large-current generator 2 are controlled by the current rising control console 3 to generate steady-state test current and impact current required by the test;
the switching-on circuit breaker 4, the isolating switch 6, the three-phase coaxial high-temperature superconducting cable system 7 and the simulation load 9 are sequentially connected in series between two current output ends of the low-voltage large-current generator;
the current transformer 4 is arranged between the isolating switch 6 and the closing circuit breaker 4;
a grounding switch 10 is arranged between the closing circuit breaker 5 and the isolating switch 6;
the grounding circuit breaker 8 is connected in parallel with two ends of the analog load 9;
the comprehensive measurement and control protection device 11 is connected to the upwelling control console 3, the closing circuit breaker 4, the disconnecting switch 6, the grounding circuit breaker 8 and the grounding switch 10 respectively, and test parameter testing, test loop control and protection functions are achieved.
Further preferably:
the three-phase coaxial high-temperature superconducting cable system 7 comprises a three-phase coaxial high-temperature superconducting cable 70, a superconducting cable terminal 71, a circulating cooling monitoring device 72, an asymmetric current monitoring device 73, a nanovolt meter 74 and a cable system temperature monitoring device 75;
the circulating cooling monitoring device 72 is arranged at the superconducting cable terminal 71 at one side and is used for providing circulating liquid nitrogen as a cooling medium for the three-phase coaxial high-temperature superconducting cable 70 and the superconducting cable terminal 71 and monitoring the mass flow rate and the refrigerating power of the liquid nitrogen and the temperature and pressure monitoring values of the inlet and the outlet of the liquid nitrogen cooling loop;
the asymmetric current monitoring device 73 is used for monitoring induced current flowing in a shielding layer in the cable in a three-phase asymmetric state;
the nano-volt meter is arranged at a superconducting cable terminal 71 and is used for collecting the voltage of the high-temperature superconducting cable terminal;
the cable system temperature monitoring device 75 is used for collecting and analyzing the temperature distribution condition of the three-phase coaxial high-temperature superconducting cable in the full-length range.
The cable system temperature monitoring device 75 comprises an ultralow temperature sensor 711 installed in the three-phase coaxial high-temperature superconducting cable, and the ultralow temperature sensors are respectively installed on the outer surface of the shielding layer of the high-temperature superconducting cable and the inner surface of the hollow framework at intervals of a set distance;
the type of the ultra-low temperature sensor 711 is a platinum resistance sensor or a temperature measuring optical fiber, and a flexible ultra-high molecular polyethylene protective tube is wrapped outside the platinum resistance sensor or the temperature measuring optical fiber.
The test parameters comprise liquid nitrogen mass flow, refrigeration power, temperature and pressure monitoring values of an inlet and an outlet of a liquid nitrogen cooling circuit, a current monitoring value of a high-temperature superconducting current shielding layer, a voltage monitoring value of a high-temperature superconducting cable, a three-phase current value of the high-temperature superconducting cable and a temperature distribution monitoring value of the high-temperature superconducting cable, wherein the liquid nitrogen mass flow, the refrigeration power and the temperature and pressure monitoring values are used as cooling liquid of the high-temperature superconducting cable, the test parameters are all connected to the comprehensive measurement and control protection device 11 through measurement signal lines, and the comprehensive measurement and control protection device 11 is used for judging whether the three-phase coaxial high-temperature superconducting cable is quenched or not.
The low-voltage large-current generator 2 outputs three-phase current in long-term operation, namely the required steady-state test current is at least 5kA, and the impact current output capacity can reach 25kA within 2 s;
the grounding circuit breaker 8 is used for realizing independent control of the short circuit grounding state of each phase circuit, the synchronism of three phases is less than 3ms during closing, and three phases can share one split-phase control circuit breaker or each phase independently uses one circuit breaker;
and other equipment in the main loop of the test system is standard equipment for a 10kV power distribution system.
The utility model discloses following profitable technological effect has for prior art:
1. the prior art can only carry out three-phase steady state through-flow test to the coaxial high temperature superconducting cable of three-phase, the utility model discloses based on 25 kA's low pressure heavy current impact test platform, can carry out the long-time heavy current steady state through-flow test of coaxial high temperature superconducting cable of three-phase and transient state through-flow test of instantaneous heavy current on the same set of test device simultaneously;
2. prior art is difficult to monitor the coaxial high temperature superconducting cable test parameter of three-phase, the utility model discloses an use methods such as distributed temperature monitoring and asymmetric current monitoring, develop synchronous monitoring to a series of test parameters such as cable conductor electric current, cable temperature distribution, cable terminal voltage, circulative cooling device state among the cable test process.
To sum up, based on the utility model provides a device and method develop the three-phase coaxial high temperature superconducting cable temporarily, steady state through-flow test has safe reliability height, experimental parameter can monitor etc. and show the advantage.
Description of the drawings:
fig. 1 is a schematic diagram of a main circuit single line of a 10kV three-phase coaxial superconducting cable fault transient through-flow test device in an embodiment of the present invention.
Fig. 2 is a schematic structural view of a three-phase coaxial superconducting cable apparatus according to an embodiment of the present invention.
Fig. 3 is a schematic structural view of a three-phase coaxial superconducting cable according to an embodiment of the present invention.
The specific implementation mode is as follows:
the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention. It is specifically stated that the following description is given for the purpose of macroscopic explanation and illustration only and is in no way intended to limit the invention, its application or uses. Unless specifically stated otherwise, the relative arrangement of the components and steps and the numerical expressions and numerical values set forth in the embodiments do not limit the scope of the present invention.
Fig. 1 is a schematic diagram of a main circuit single line of a 10kV three-phase coaxial superconducting cable fault transient through-flow test device in an embodiment of the present invention. In this embodiment, the three-phase coaxial superconducting cable fault transient through-flow test device includes an electric induction voltage regulator 1, a low-voltage large-current generator 2, a closing circuit breaker 4, a current transformer 5, a disconnecting switch 6, a three-phase coaxial superconducting cable system 7, a grounding circuit breaker 8, an analog load 9, a grounding switch 10, an up-flow control console 3, a comprehensive measurement and control protection device 11, a measurement signal line 12 and a control signal line 13, and a main loop of the test device is a complete three-phase loop; the loop current rise control part consists of an electric induction voltage regulator 1, a low-voltage large-current generator 2 and a current rise control console 3, the current rise control console 3 controls the voltage regulator 1 and the large-current generator 2 to carry out electric voltage regulation and current rise control at the same time, the output of the low-voltage large-current generator 2 is connected to a main loop of the testing device, and the three-phase large-current loop current rise control device has long-time three-phase large-current output capacity. The induction type straight-through CT of the low-voltage large-current generator 2 outputs three-phase current of at least 5kA after long-term operation, so that sufficient capacity support is provided for a test device in a power frequency test environment, and the output capacity of impact current can reach 25kA within 2 s. It can be understood that, the utility model discloses based on 25kA heavy current impact test platform, develop the impact test of superconducting cable under impulse current, record appearance cable each phase current, voltage and temperature rise change curve. The closing circuit breaker 4 has protection functions such as overcurrent protection, quick-break protection, overcurrent protection, open-phase protection, frequency protection and the like.
It can be understood that, according to the coaxial superconducting cable structural feature of compact three-phase, consider the big current-carrying operation requirement of three-phase, the utility model discloses utilize equipment such as test transformer, high-power upwelling device and high tension cable circuit to build three-phase test device platform to satisfy three-phase current amplitude and phase symmetry, and have asymmetric fault adjustment ability, realize the required test condition of superconducting cable three-phase through-flow and asymmetric fault operation. The independent control of three-phase amplitude and phase is realized through a test transformer; the high-power current rise control device is adopted to realize independent control of three-phase current and phase, so that the experimental requirements of three-phase current and asymmetric fault operation of the superconducting cable are met.
In this embodiment, the grounding circuit breaker 8 is used to realize independent and fast control of the short-circuit grounding state of each phase circuit, and a three-phase shared split-phase control fast circuit breaker or a fast circuit breaker to which each phase is individually connected can be selected according to actual conditions. Other equipment in the test main loop is standard equipment for a 10kV power distribution system, and the test parameter test, the test loop control and the protection function are realized by the comprehensive measurement and control protection device 11. It can be understood that the ground circuit breaker 8 can implement asymmetric operation fault simulation such as single-phase-to-ground short circuit, two-phase-to-ground short circuit, three-phase-to-ground short circuit, load switching and the like by switching the simulated loads 9 with different resistance values, and test the current, phase, shielding current and interphase voltage distribution of three phases under different faults.
Fig. 2 is a schematic structural diagram of a three-phase coaxial superconducting cable system 7 according to an embodiment of the present invention. In the present embodiment, the three-phase coaxial superconducting cable system 7 includes a three-phase coaxial high-temperature superconducting cable 70, a superconducting cable terminal 71, a circulation cooling monitoring device 72, an asymmetric current monitoring device 73, a high-precision nanovolt meter 74, and a cable system temperature monitoring device 75. The circulating cooling control device 72 is used for providing circulating liquid nitrogen as a cooling medium for the three-phase coaxial high-temperature superconducting cable 70 and the superconducting cable terminal 71, and ensuring that the three-phase coaxial high-temperature superconducting cable 70 works below the operating temperature (-196 ℃). The asymmetric current monitoring device 73 is used for monitoring induced current flowing through the hollow framework and the shielding layer in the cable in a three-phase asymmetric (system fault) state through the current transformer, and verifying the current capacity of the three-phase coaxial high-temperature superconducting cable 70 in the three-phase asymmetric (system fault) state together with the three-phase current monitored by the three-phase current transformer 4. The high-precision nanovolt meter 74 is used for collecting the voltage of the superconducting cable end from the superconducting cable terminal 71, the cable system temperature monitoring device 75 is used for collecting and analyzing the temperature distribution condition of the three-phase coaxial high-temperature superconducting cable 70 in the whole length range, and both the methods can be used for judging the quench state of the three-phase coaxial high-temperature superconducting cable 70. The mass flow, pressure, refrigeration power and inlet and outlet temperature monitoring values of the liquid nitrogen obtained by the circulating cooling monitoring device 72, the current monitoring values of the inner hollow framework and the shielding layer of the cable obtained by the asymmetric current monitoring device 73, the voltage monitoring values of the superconducting cable obtained by the high-precision nano-volt meter 74 and the temperature distribution monitoring values of the cable obtained by the cable system temperature monitoring device 75 are all connected to the comprehensive measurement and control protection device 11 through the measurement signal wire 12, and the comprehensive measurement and control protection device 11 is combined with all monitoring data to judge whether the three-phase coaxial high-temperature superconducting cable 70 is quenched or not.
Fig. 3 is a schematic structural view of a three-phase coaxial superconducting cable according to an embodiment of the present invention. In the present embodiment, the three-phase coaxial hts cable 70 includes, from outside to inside: the three-phase coaxial high-temperature superconducting cable 70 works below the operating temperature (-196 ℃), wherein a liquid nitrogen backflow channel is arranged inside the hollow skeleton 709, and a liquid nitrogen backflow channel is arranged between the heat insulating layer 701 and the shielding layer 702, the C-phase insulating layer 703, the C-phase superconducting tape 704, the B-phase insulating layer 705, the B-phase superconducting tape 706, the A-phase insulating layer 707, the A-phase superconducting tape 708 and the hollow skeleton 709 are all filled with liquid nitrogen 710.
In this embodiment, an ultra-low temperature sensor 711 is further installed inside the three-phase coaxial high temperature superconducting cable 70, and the ultra-low temperature sensor is installed on the outer surface of the shielding layer 702 and the inner surface of the hollow skeleton 709, that is, in the region of the liquid nitrogen 710. The ultra-low temperature sensor 711 mounted on the outer surface of the shielding layer 702 is sensitive to the local temperature rise of the C-phase superconducting tape 704, and the ultra-low temperature sensor 711 mounted on the inner surface of the hollow frame 709 is sensitive to the local temperature rise of the a-phase superconducting tape 708.
It will be appreciated that typically the liquid nitrogen return path will be at a temperature slightly higher than the liquid nitrogen return path, i.e., ultra-low temperature sensor 711 on the outer surface of shield 702 will be at a temperature slightly higher than the temperature of ultra-low temperature sensor 711 on the inner surface of hollow backbone 709. It can be understood that, in order to improve the current carrying capacity of the superconducting cable, a multi-layer superconducting conducting layer structure is adopted, so that when the superconducting cable carries alternating current, the current distribution of each layer is uneven, which is generally indicated as that the outer layer current is larger than the inner layer current, and particularly when the total current is increased, the outer layer current is increased obviously, which causes the outer layer current to reach the critical current first. Therefore, the alternating current loss of the superconducting cable can be increased, the current carrying capacity is reduced, the safety and stability of the operation of the cable can be threatened in serious cases, the operation cost is increased, the distortion of the alternating current carrying can be caused, and the electric energy quality is influenced. In the actual work of the cable, various abnormal working conditions can occur, the superconducting cable needs to ensure the working stability under the fault working conditions to meet the power transmission application, and when the rated current is exceeded, the current distribution of the superconducting cable is more complicated and is related to the temperature of the cable.
It is understood that, for a three-phase coaxial superconducting cable, the structure takes a copper skeleton as an axis, the three phases are A, B, C from inside to outside respectively, insulation layers are used for spacing the three phases, the skeleton is generally made of flexible metal corrugated pipes, and the inside of the skeleton is used for transmitting a cooling medium, as shown in fig. 3. When the three-phase coaxial superconducting cable is used for three-phase current transmission, when the three phases are balanced, no leakage magnetic field exists outside the cable basically, and no induced current is generated in the shielding layer; when the three-phase coaxial superconducting cable has a short-circuit fault, a magnetic field exists outside the superconducting cable, and an induced current is generated in the shielding layer. The current in the shield layer is larger when a single-phase short circuit and a two-phase short circuit occur, and the current in the shield layer is smaller when a three-phase short circuit occurs. The utility model provides an asymmetric current monitoring devices 73 is through the induced-current that flows in hollow skeleton and the shielding layer in the cable under the current transformer monitoring three-phase asymmetry (system fault) state promptly, verifies the through-current capacity (analysis shielding layer current account for the total current ratio) of the coaxial high temperature superconducting cable 70 of three-phase under the three-phase asymmetry (system fault) state with the three-phase current that three-phase current transformer 4 monitored jointly.
In this embodiment, the ultra-low temperature sensor 711 is a platinum resistance sensor or a temperature measuring optical fiber, and a flexible ultra-high molecular weight polyethylene (UPE) protection tube is wrapped outside the ultra-low temperature sensor 711 to ensure that the sensor is reliably installed and accurately senses temperature. The platinum resistance sensor adopts a PT100 four-wire system measuring mode, is suitable for monitoring the internal temperature of a shorter superconducting cable sample cable and a cable terminal, and is respectively provided with an ultralow temperature sensor 711 in a liquid nitrogen defluidizing channel and a liquid nitrogen backflow channel every 0.5m in the full-length range. The distributed optical fiber sensor principle or the optical fiber grating sensor principle can be adopted in the temperature measuring optical fiber, the optical fiber grating sensor can be adopted for the superconducting cable sample cable with medium length (about 5-10m), and the distance between adjacent gratings is not more than 0.5 m; for longer superconducting cable or engineered superconducting cable products, distributed fiber optic sensors may be employed. Because the platinum resistor is complex to install and has a limited response speed, and the distributed optical fiber temperature measurement needs a longer tail fiber to ensure higher temperature measurement accuracy and spatial resolution, the cascaded fiber bragg grating sensor is preferably adopted in the ultralow temperature sensor 711 in the embodiment. When necessary, the Fabry-Perot resonant cavity (F-P resonant cavity) is used for assisting in demodulating the fiber grating sensor, and more fiber grating sensors can be connected in series to improve the temperature monitoring range and accuracy.
While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the exemplary embodiments described above. It will be apparent to those skilled in the art that the above-described exemplary embodiments may be modified without departing from the scope and spirit of the disclosure. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.
Claims (7)
1. A three-phase coaxial high-temperature superconducting cable through-flow test device comprises an electric induction voltage regulator (1), a low-voltage large-current generator (2), a closing circuit breaker (4), a current transformer (5), a disconnecting switch (6), a three-phase coaxial high-temperature superconducting cable system (7), a grounding circuit breaker (8), an analog load (9), a grounding switch (10), an up-flow control console (3) and a comprehensive measurement and control protection device (11); the method is characterized in that:
the output end of the electric induction voltage regulator (1) is connected to the input end of the low-voltage large-current generator (2), and the electric induction voltage regulator (1) and the low-voltage large-current generator (2) are controlled to generate steady-state test current and impact current required by a test through the current rising control console (3);
the switching-on circuit breaker (4), the isolating switch (6), the three-phase coaxial high-temperature superconducting cable system (7) and the analog load (9) are sequentially connected in series between two current output ends of the low-voltage high-current generator;
the current transformer (5) is arranged between the disconnecting switch (6) and the closing circuit breaker (4);
a grounding switch (10) is arranged between the closing circuit breaker (4) and the isolating switch (6);
the grounding circuit breaker (8) is connected in parallel with two ends of the analog load (9);
the comprehensive measurement and control protection device (11) is connected to the current rising control console (3), the closing circuit breaker (4), the disconnecting switch (6), the grounding circuit breaker (8) and the grounding switch (10) respectively, and test parameter testing, test loop control and protection functions are achieved.
2. A three-phase coaxial high-temperature superconducting cable through-flow test device according to claim 1, characterized in that:
the three-phase coaxial high-temperature superconducting cable system (7) comprises a three-phase coaxial high-temperature superconducting cable (70), a superconducting cable terminal (71), a circulating cooling monitoring device (72), an asymmetric current monitoring device (73), a nanovolt meter (74) and a cable system temperature monitoring device (75);
the circulating cooling monitoring device (72) is arranged at a superconducting cable terminal (71) at one side and is used for providing circulating liquid nitrogen as a cooling medium for the three-phase coaxial high-temperature superconducting cable (70) and the superconducting cable terminal (71) and monitoring the mass flow rate and the refrigerating power of the liquid nitrogen as well as the temperature and the pressure monitoring values of an inlet and an outlet of a liquid nitrogen cooling loop;
the asymmetric current monitoring device (73) is used for monitoring induced current flowing in a shielding layer in the cable in a three-phase asymmetric state;
the nano-volt meter is arranged at a superconducting cable terminal (71) and is used for collecting the voltage of the high-temperature superconducting cable terminal;
the cable system temperature monitoring device (75) is used for collecting and analyzing the temperature distribution condition of the three-phase coaxial high-temperature superconducting cable in the full-length range.
3. A three-phase coaxial high-temperature superconducting cable through-flow test device according to claim 2, characterized in that:
the cable system temperature monitoring device (75) comprises ultralow temperature sensors (711) arranged in the three-phase coaxial high-temperature superconducting cable, wherein the ultralow temperature sensors are respectively arranged on the outer surface of a shielding layer of the high-temperature superconducting cable and the inner surface of the hollow framework at intervals of a set distance.
4. A three-phase coaxial high-temperature superconducting cable through-flow test device according to claim 3, characterized in that:
the ultra-low temperature sensor (711) is a platinum resistance sensor or a temperature measuring optical fiber, and a flexible ultra-high molecular polyethylene protective tube is wrapped outside the ultra-low temperature sensor.
5. A three-phase coaxial high-temperature superconducting cable through-flow test device according to claim 1 or 2, characterized in that:
the test parameters comprise liquid nitrogen mass flow and refrigeration power used as high-temperature superconducting cable cooling liquid, temperature and pressure monitoring values of an inlet and an outlet of a liquid nitrogen cooling loop, a current monitoring value of a high-temperature superconducting current shielding layer, a voltage monitoring value of the high-temperature superconducting cable, a three-phase current value of the high-temperature superconducting cable and a temperature distribution monitoring value of the high-temperature superconducting cable, and the test parameters are connected to the comprehensive measurement and control protection device (11) through measurement signal lines.
6. A three-phase coaxial high-temperature superconducting cable through-flow test device according to claim 1, characterized in that:
the low-voltage large-current generator (2) outputs three-phase current in long-term operation, namely required steady-state test current is at least 5kA, and the impact current output capacity can reach 25kA within 2 s.
7. The through-flow test device for the three-phase coaxial high-temperature superconducting cable according to claim 1 or 6, wherein:
the grounding circuit breaker (8) is used for realizing the independent control of the short circuit grounding state of each phase circuit, the synchronism of three phases is less than 3ms during closing, and three phases can be selected to share one split-phase control circuit breaker or each phase independently uses one circuit breaker;
and other equipment in the main loop of the test system is standard equipment for a 10kV power distribution system.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112698118A (en) * | 2020-11-03 | 2021-04-23 | 国网辽宁省电力有限公司电力科学研究院 | Three-phase coaxial high-temperature superconducting cable through-flow test system and temporary and steady test method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112698118A (en) * | 2020-11-03 | 2021-04-23 | 国网辽宁省电力有限公司电力科学研究院 | Three-phase coaxial high-temperature superconducting cable through-flow test system and temporary and steady test method |
| CN112698118B (en) * | 2020-11-03 | 2024-06-04 | 国网辽宁省电力有限公司电力科学研究院 | Three-phase coaxial high-temperature superconducting cable through-flow test system and temporary and steady-state test method |
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