JP4409745B2 - Transmission and transformation equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power transmission / transformation system in which power transmission / transformation equipment is installed in a substation for voltage conversion in order to transmit power from an upper system on the power plant side to a lower system on the customer side, or in a switching station for distributing the power transmission system. In particular, the present invention relates to a power transmission / transformation facility that cools at least one of the power transmission / transformation devices with a low-temperature refrigerant.
[0002]
[Prior art]
In the field where superconductivity is applied, application to electric power is one of the expected fields. The basic concept is that a large current can flow with zero resistance. In fact, in the case of AC energization as in power equipment, AC loss occurs in the superconducting conductor. Even if the electric input of the refrigerator necessary for removing the AC loss is taken into account, there is an advantage that the loss is reduced as compared with the conventional ohmic loss of a normal conducting metal such as copper. Application equipment that takes advantage of this advantage includes power transmission cables and transformers. In addition to the above-described advantages, a current limiter using resistance generation when transitioning from a superconducting state to normal conduction due to overcurrent can also be cited as a power application device using superconductivity.
[0003]
For these transmission cables, transformers, and current limiters, individual devices are being studied and prototyped, but these devices have not yet reached a practical level. In other words, it is an important issue to improve the performance of equipment to a practical level that surpasses that of current devices. In the next practical application stage, it is necessary to fully consider the fact that each device is actually installed as a power facility such as a substation.
[0004]
[Problems to be solved by the invention]
As described above, regarding power transmission cables, transformers, and current limiters, at present, it is an important issue to raise the level to a practical level as equipment, that is, to a level that surpasses that of current devices. As the next stage of practical use, as an actual power equipment such as the equipment substation, should consider when installed, specifically include the following problems.
[0005]
First, there is a problem of cooling. When a plurality of superconducting devices are installed in a substation or the like, a refrigeration cooling system that takes efficiency, reliability, and redundancy into consideration is required.
[0006]
Secondly, there is a problem of electrical protection of the superconducting power transmission cable. The transmission cable should not be considered as a single device, but should be considered including overcurrent protection against the rated current. Third, consistency with other ancillary equipment due to the introduction of superconductivity. In other words, the issue is how to match or share the temperature environment and the insulation environment when superconductivity is introduced.
[0007]
The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a power transmission / transformation facility with improved reliability and redundancy while improving efficiency when a superconducting device is installed.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, in the invention described in claim 1, a substation for voltage conversion to transmit power from a higher-level system on the power plant side to a lower-level system on the customer side, and a switching station that distributes the transmission system. in transmission and transformation facility transmission substation equipment is installed respectively, accumulated a cryogen for cooling the superconducting device of the transmission substation equipment, a refrigerant storage tank that will be connected through the cooling pipe and the superconducting apparatus, the refrigerant reservoir A low-temperature refrigerator that cools the low-temperature refrigerant in the tank, and the transmission and transformation equipment is superconducting, a voltage conversion transformer, a circuit breaker, a disconnector, a switch composed of a busbar, and a phase adjustment It consists of a shunt reactor, a current limiter for short-circuit current suppression, and a power transmission cable to the upper and lower systems, and a plurality of types of the power transmission / transformation equipment are selected, and the low-temperature refrigerator and the Refrigerant storage tank And use, the coolant reservoir is characterized in that it is installed in the substation or switchyard.
[0009]
According to the first aspect of the invention, transmission and transformation stored the cryogen to the superconducting device cooling equipment, the superconducting device and the refrigerant storage tank that will be connected through the cooling pipe, the low temperature of the refrigerant reservoir tank By providing a low-temperature refrigerator that cools the refrigerant, it is possible to supply the low-temperature refrigerant from the refrigerant storage tank to the superconducting equipment even if the low-temperature refrigerator fails and stops, so the reliability and redundancy as a cooling source Can be improved.
[0010]
In the invention described in claim 1 , the power transmission / transformation equipment is superconducting, a voltage conversion transformer, a circuit breaker, a disconnector, a switch composed of a bus, a shunt reactor for phase adjustment, a short-circuit current is composed from the power transmission cable to the current limiter and the vertical position system for suppressing the transmission and transformer equipment, a plurality thereof is selected, the shared low temperature refrigerator and the refrigerant reservoir between these transmission substation equipment The refrigerant storage tank is installed in the substation or switching station .
[0011]
According to the first aspect of the present invention, the cooling efficiency can be increased by collectively cooling a plurality of types of power transmission and transformation equipment in the low-temperature refrigerator and the refrigerant storage tank.
[0012]
With the second aspect of the present invention, the transmission substation equipment of claim 1 Symbol mounting, the power transmission cable is a superconducting transmission cable, providing a plurality of circulation pumps for feeding the low-temperature coolant from the coolant reservoir to the superconducting power transmission cable A plurality of the low-temperature refrigerators are installed.
[0013]
According to the second aspect of the present invention, since a plurality of circulation pumps and low-temperature refrigerators are installed, redundancy is obtained that can stop at least one unit, so that maintenance can be handled without stopping the equipment. Can do.
[0014]
In the invention of claim 3, wherein, in the transmission substation equipment of claim 1 Symbol placement, the current limiting device is a rectification type fault current limiter constituted by the DC reactor and the rectifier bridge, the normal temperature environment the rectifier bridge On the other hand, only the DC reactor is cooled by a low-temperature refrigerant.
[0015]
According to the third aspect of the present invention, only the DC reactor that generates a large amount of heat is cooled at a low temperature, and the rectifier bridge is used in a room temperature environment, whereby the cooling can be performed efficiently.
[0016]
In the invention of claim 4, wherein, in the transmission substation equipment of claim 1 Symbol mounting, the power transmission cable is a superconducting transmission cable, placing the leak sensor in a plurality of locations at a predetermined distance in the longitudinal direction of the superconducting power transmission cable The refrigerant leakage is detected based on the detection signal of the leakage sensor.
[0017]
According to the fourth aspect of the present invention, it is possible to easily determine whether or not the cooling system is abnormal by detecting the leakage of the refrigerant.
[0018]
According to a fifth aspect of the present invention, in the power transmission and transformation equipment according to the fourth aspect, a current detector for detecting a current value flowing through the superconducting power transmission cable is provided, and both of the current detector and the leakage sensor are obtained. Based on the detection signal, the presence or absence of leakage of the low-temperature refrigerant and the leakage location are specified.
[0019]
According to the fifth aspect of the present invention, when the information obtained from the leakage sensor shows an abnormal value, it is possible to easily determine whether the information is due to an overload current or a cooling system abnormality. .
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0021]
[First Embodiment]
FIG. 1 is a configuration diagram showing a first embodiment of a transmission and substation facility according to the present invention.
[0022]
As shown in FIG. 1, the substation 10 transforms power by a transformer 13 in order to transmit the power transmitted from the upper system on the power plant side via the power transmission cable 11 to the power transmission cable 12 on the lower system on the customer side. . On the upper and lower system sides of the transformer 13, switchgears 14a and 14b and current limiters 15a and 15b are installed, respectively. Since the power transmission cables 11 and 12 are superconducting, current limiters 15a and 15b are connected to protect against accidental current. The substation 10 is also provided with a shunt reactor 16 for phase adjustment.
[0023]
A part of the power transmission / transformation equipment including the power transmission cables 11 and 12, the transformer 13, the switchgears 14a and 14b, the current limiters 15a and 15b, and the shunt reactor 16 may be superconducting or normal conducting, It is cooled using.
[0024]
That is, in the embodiment shown in FIG. 1, the power transmission cable 12 which is a superconducting device of the power transmission / transformation device is connected to the cooling source 19a through the cooling pipe 18a inserted with the circulation pump 17, and the superconducting device of the power transmission / transformation device. Current limiters 15a and 15b and shunt reactor 16 are connected to cooling sources 19b, 19c and 19d through cooling pipes 18b, 18c and 18d, respectively. These cooling sources 19a to 19d are composed of a refrigerant buffer tank 20 as a refrigerant storage tank for storing a low-temperature refrigerant, and a low-temperature refrigerator 21 in the refrigerant buffer tank 20.
[0025]
As the low-temperature refrigerant, liquefied natural gas, liquid oxygen, liquid nitrogen, liquid argon, liquid neon, liquid hydrogen, liquid helium, or a mixed fluid of two or more of them and sulfur hexafluoride is used. Here, not only the saturation temperature of these liquids, but also a refrigerant cooled by a subcooled temperature that is cooled below the saturation temperature may be used. Can be used for cooling.
[0026]
FIG. 2 is a schematic view showing a connection form between the refrigerant buffer tank 20 and the low-temperature refrigerator 21 of the present embodiment. The connection form shown in FIG. 2 is used when the current limiters 15a and 15b and the shunt reactor 16 are connected to the refrigerant buffer tank 20 of the cooling sources 19b, 19c and 19d via the cooling pipes 18b, 18c and 18d, respectively. It is a form.
[0027]
FIG. 3 is a schematic view showing another connection form of the refrigerant buffer tank 20 and the low-temperature refrigerator 21 of the present embodiment. The connection form shown in FIG. 3 is a connection form used when the power transmission cable 12 is connected to the refrigerant buffer tank 20 of the cooling source 19a through the cooling pipe 18a with the circulation pump 17 interposed therebetween. In this connection mode, since the circulation pump 17 is inserted in the cooling pipe 18 a, the return pipe 22 is connected to the refrigerant buffer tank 20.
[0028]
FIG. 4 is a schematic view showing still another connection form between the refrigerant buffer tank 20 and the low-temperature refrigerator 21 of the present embodiment. The connection form shown in FIG. 4 is a connection form in which the cooling pipe 18 a and the return pipe 22 are connected to the heat exchanger 23 in the refrigerant buffer tank 20 in addition to the connection form of FIG. 3. In this connection form, the circulation pump may not be installed between the superconducting device.
[0029]
Therefore, the power transmission cable 12 which is a superconducting device is forcedly cooled by circulating the low-temperature refrigerant from the cooling source 19a by the circulation pump 17, and the current limiters 15a and 15b and the shunt reactor 16 which are superconducting devices are cooled. Cooled by the cooling sources 19b, 19c and 19d through the pipes 18b, 18c and 18d.
[0030]
Thus, according to the present embodiment, the cooling sources 19a to 19d are composed of the refrigerant buffer tank 20 that stores the low-temperature refrigerant, and the low-temperature refrigerator 21 in the refrigerant buffer tank 20, so that the low-temperature refrigerator. Even if 21 fails and stops, low-temperature refrigerant can be supplied from the refrigerant buffer tank 20 to the superconducting equipment via the cooling pipes 18a to 18d, so that the reliability and redundancy of the cooling sources 19a to 19d can be improved. it can.
[0031]
In addition, although this embodiment demonstrated the case where it applied to a substation, it is also possible to apply to the switch station which distributes a power transmission system. The following embodiments are also the same.
[0032]
[Second Embodiment]
FIG. 5 is a block diagram showing a second embodiment of the transmission and transformation equipment according to the present invention. The same or corresponding parts as those in the first embodiment will be described using the same reference numerals. The following embodiments are also the same.
[0033]
As shown in FIG. 5, in this embodiment, a plurality of power transmission / transformation devices, such as a power transmission cable 12, a transformer 13, switchgears 14 a and 14 b, current limiters 15 a and 15 b, and a shunt reactor 16, are connected via a cooling pipe 18. And connected to a common cooling source 19 for cooling. This common cooling source 19 is composed of a refrigerant buffer tank 20 for storing a low-temperature refrigerant as in the first embodiment, and a low-temperature refrigerator 21 in the refrigerant buffer tank 20. In this embodiment, The power transmission cable 12, the transformer 13, the switchgears 14a and 14b, the current limiters 15a and 15b, and the shunt reactor 16 are cooled by the low-temperature refrigerant. However, at least two, that is, a plurality of types of power transmission and transformation equipment are used as the cooling source. 19 may be used for cooling.
[0034]
As described above, according to this embodiment, the power transmission cable 12, the transformer 13, the switchgear devices 14 a and 14 b, the current limiters 15 a and 15 b, and the shunt reactor 16, which are a plurality of power transmission and transformation devices, are collectively collected by the common cooling source 19. Therefore, it is possible to perform cooling more efficiently than arranging a cooling source for each power transmission and transformation device as in the first embodiment.
[0035]
[Third Embodiment]
FIG. 6 is a block diagram showing a third embodiment of the transmission and transformation equipment according to the present invention.
[0036]
In this embodiment, as shown in FIG. 3, the low-temperature refrigerator and the circulation pump are composed of a plurality of machines. That is, three low-temperature refrigerators 21 a to 21 c are installed for one refrigerant buffer tank 20, and three circulation pumps 17 a to 17 c are arranged in parallel to the cooling pipe 24 inserted into the power transmission cable 12. is set up. The power transmission cable 12 is a superconducting power transmission cable through which the cooling pipe 24 is inserted as described above, and is provided through the pipe 25.
[0037]
Therefore, the low-temperature refrigerant is supplied from the refrigerant buffer tank 20 to the cooling pipe 24 in the power transmission cable 12 through the three circulation pumps 17a to 17c, and the power transmission cable 12 is cooled. The cooled refrigerant is returned to the refrigerant buffer tank 20 via the return pipe 22.
[0038]
Thus, the low temperature refrigerator 21 and the circulation pump 17 do not necessarily need to be a single machine. In the single machine, there is a problem that the equipment is stopped at every regular maintenance. In the present embodiment, three low-temperature refrigerators 21a to 21c are installed, and three circulation pumps 17a to 17c are installed in parallel. In particular, if the low-temperature refrigerators 21a to 21c and the circulation pumps 17a to 17c having a capacity of 1 / N with respect to the required capacity are operated in parallel with (N + 1) or more units, at least one unit is stopped. Therefore, it is possible to cope with maintenance without stopping the equipment.
[0039]
In addition, although this embodiment demonstrated the case where it applied to the power transmission cable 12, it can also apply also to the power transmission cable 11. FIG. Moreover, when applied to the power transmission cable 12 in the following embodiment, it is assumed that the present invention can also be applied to the power transmission cable 11.
[0040]
[Fourth Embodiment]
FIG. 7 is a block diagram showing a fourth embodiment of the transmission and transformation equipment according to the present invention.
[0041]
In the present embodiment, as shown in FIG. 7, a low-temperature refrigerator 21a is installed in the refrigerant buffer tank 20, and a predetermined distance is also provided in the middle of the power transmission cable 12, which is a superconducting power transmission cable connecting substations. Low temperature refrigerators 21b and 21c are arranged.
[0042]
Thus, according to this embodiment, the capacity | capacitance of the circulation pump 17 can be reduced by disperse | distributing and arrange | positioning required refrigeration capacity to several low temperature refrigerator 21a-21c.
[0043]
In the present embodiment, the low-temperature refrigerators 21a to 21c are dispersedly arranged. However, the present invention is not limited to this, and the refrigerant buffer tank 20 or the circulation pump 17 may be dispersedly arranged. It is also possible to disperse a plurality of the low temperature refrigerator 21, the refrigerant buffer tank 20, and the circulation pump 17.
[0044]
[Fifth Embodiment]
FIG. 8 is a block diagram showing a fifth embodiment of the transmission and transformation equipment according to the present invention.
[0045]
In the present embodiment, as shown in FIG. 8, two bushings 26 of the power introduction unit are attached to the current limiter 15 as a low temperature device cooled by the low temperature refrigerant, and the current limiter 15 is connected to these bushings 26. And via the connection line 27, it is electrically connected to switchgears 14a and 14b as power transmission and transformation equipment installed at room temperature in a sulfur hexafluoride gas environment.
[0046]
The bushing 26 has a large temperature gradient from the low temperature part in the current limiter 15 to the high temperature part outside the current limiter 15. That is, by maintaining the temperature of the high temperature portion of the bushing 26 at a temperature higher than -20 degrees Celsius, the sulfur hexafluoride gas having a pressure of 0.6 MPa is within the range where it does not liquefy, and the room temperature environment is insulated by the sulfur hexafluoride gas. The lower switchgears 14a and 14b can be directly connected to the current limiter 15.
[0047]
The current limiter 15 is cooled by the low-temperature refrigerant from the refrigerant buffer tank 20 cooled by the low-temperature refrigerator 21.
[0048]
As described above, according to the present embodiment, the current limiter 15 cooled by the low-temperature refrigerant when the current limiter 15 as a low-temperature device is connected to the switchgears 14a and 14b as power transmission and transformation devices arranged in a room temperature environment. By maintaining the high temperature side of the bushing 26 corresponding to the power introduction section at a temperature higher than -20 degrees Celsius, the low temperature equipment and the transmission and transformation equipment arranged in the normal temperature environment can be directly connected.
[0049]
In the present embodiment, the current limiter 15 is selected as the low temperature device, and the switchgears 14a and 14b are selected as the power transmission / transformation devices. However, other power transmission / transformation devices may be appropriately selected and used.
[0050]
[Sixth Embodiment]
FIG. 9 is a block diagram showing a sixth embodiment of the transmission and transformation equipment according to the present invention.
[0051]
In the present embodiment, as shown in FIG. 9, the switchgear 30 mainly includes a circuit breaker 31, a disconnector 32, a transformer 33, a lightning arrester 34, and a grounding device 35. And at least one part of the apparatus in the switchgear 30 is insulated with a low temperature refrigerant | coolant, and the low temperature refrigerant | coolant is used as the arc-extinguishing medium of the circuit breaker 31. FIG.
[0052]
As described above, according to the present embodiment, at least a part of the devices in the switchgear 30 is insulated with the low-temperature refrigerant, thereby facilitating connection with the low-temperature devices. Moreover, by using a low-temperature refrigerant as the arc extinguishing medium of the circuit breaker 31, arc energy can be absorbed efficiently and the interruption performance can be improved. As a result, desulfurized hexafluoride can be achieved.
[0053]
[Seventh Embodiment]
FIG. 10 is a block diagram showing a seventh embodiment of the transmission and transformation equipment according to the present invention.
[0054]
In this embodiment, as shown in FIG. 10, a rectifier type current limiter 37 is applied as a current limiter for suppressing a short-circuit current, and this rectifier type current limiter 37 includes a rectifier bridge 38 and a DC reactor 39. Has been. And this direct current reactor 39 is accommodated in the cryogenic container 40 as a refrigerant | coolant storage tank.
[0055]
That is, the DC reactor 39 accommodated in the cryogenic container 40 is electrically connected to the rectifier bridge 38 via the bushing 26 and the connection line 27 installed in the cryogenic container 40.
[0056]
As described above, according to the present embodiment, in the rectifying type current limiting device 37, only the DC reactor 39 that generates a large amount of heat is cooled at a low temperature, and the rectifier bridge 38 is used in a room temperature environment, thereby efficiently cooling. be able to.
[0057]
[Eighth Embodiment]
FIG. 11 is a block diagram showing an eighth embodiment of the transmission and transformation equipment according to the present invention.
[0058]
In the present embodiment, as shown in FIG. 8, leakage sensors (or temperature sensors) 42 are arranged at a plurality of locations at a predetermined distance in the longitudinal direction in the power transmission cable 12 that is a superconducting power transmission cable. The leak sensor 42 is connected to the monitoring device 44 via the signal line 43.
[0059]
Therefore, the detection signal of the leakage sensor 42 is sent to the monitoring device 44 via the signal line 43. The monitoring device 44 monitors the leakage of the refrigerant in the power transmission cable 12 based on the detection signal of the leakage sensor 42, and Reflect to the control system. Alternatively, it is possible to specify the leak location and save the trouble of recovery work. As the leak sensor 42, for example, a piezoelectric element type pressure sensor is used.
[0060]
As described above, according to the present embodiment, the leakage sensor 42 is arranged at a plurality of locations at a predetermined distance in the longitudinal direction in the power transmission cable 12 to detect the leakage of the refrigerant, thereby facilitating the presence or absence of an abnormality in the cooling system. Can be judged.
[0061]
In this embodiment, the example in which the leakage sensors 42 are arranged at a plurality of positions at a predetermined distance in the longitudinal direction in the power transmission cable 12 has been described. However, a temperature sensor is arranged instead of the leakage sensor 42. Also good. In this case, examples of the temperature sensor include a resistance type and a thermocouple type.
[0062]
[Ninth Embodiment]
FIG. 12 is a block diagram showing a ninth embodiment of the transmission and transformation equipment according to the present invention.
[0063]
In this embodiment, as shown in FIG. 9, unlike the embodiment of FIG. 8, the leakage sensor 42 a is provided in the conduit 25, but on the outer peripheral side of the power transmission cable 12 and at a predetermined distance in the longitudinal direction. It is arranged in the place. As the leakage sensor 42a, for example, a type that measures reflection / refraction by laser irradiation is used.
[0064]
As described above, according to the present embodiment, the leakage sensor 42a and its signal line are laid by arranging the leakage sensor 42a on the outer peripheral side of the power transmission cable 12 at a predetermined distance in the longitudinal direction. Work can be simplified.
[0065]
In this embodiment as well, a temperature sensor may be arranged in place of the leakage sensor 42a, as in the eighth embodiment. In this case, examples of the temperature sensor include a type in which a crystal resonator is embedded in a cable and a transmission signal is measured.
[0066]
In the eighth embodiment or the ninth embodiment, two leakage sensors 42 and 42a (or temperature sensors) are arranged at the same location, and each signal is sent to the monitoring device 44 via the signal line 43. It is also possible to connect to the network. With this configuration, when the information obtained from the sensor shows an abnormal value, it is possible to easily determine whether it is due to an abnormality of the sensor itself or an abnormality of the cooling system. .
[0067]
[Tenth embodiment]
FIG. 13: is a block diagram which shows 10th Embodiment of the transmission / transformation equipment based on this invention.
[0068]
In this embodiment, as shown in FIG. 13, in addition to the configuration of the eighth embodiment, a current detector 45 that detects the magnitude of the current flowing through the power transmission cable 12 is installed, and the detected value signal is sent to the signal line 43. Is sent to the monitoring device 44 via
[0069]
The monitoring device 44 detects an abnormality in the cooling system using a signal obtained from the leakage sensor 42 (or temperature sensor) and a signal obtained from the current detector 45.
[0070]
As described above, according to the present embodiment, when the information obtained from the leakage sensor 42 indicates an abnormal value, it is possible to easily determine whether the information is due to an overload current or an abnormality in the cooling system. Become.
[0071]
The present invention is not limited to the above embodiments, and various modifications can be made. For example, by setting the position of the refrigerant buffer tank 20 higher than the highest point of the power transmission cable 12, even when the low-temperature refrigerator 21 or the circulation pump 17 is stopped, the refrigerant can be pumped to the power transmission cable 12 with a high or low differential pressure. .
[0072]
【The invention's effect】
As described above, according to the present invention, the refrigerant storage tank that stores the low-temperature refrigerant for cooling the superconducting equipment of the transmission and transformation equipment, and the low-temperature refrigerator that cools the low-temperature refrigerant in the refrigerant storage tank, Power transmission and transformation equipment is superconducting, voltage conversion transformers, circuit breakers, disconnectors, switches composed of busbars, shunt reactors for phase adjustment, current limiters for controlling short circuit currents, and upper and lower circuits It is composed of a power transmission cable to the system, and a plurality of types of power transmission / transformation equipment are selected, and the low-temperature refrigerator and the refrigerant storage tank are shared between the transmission / transformation equipment, and the refrigerant storage tank is the substation or open / close Installed in a location can not only increase the reliability and redundancy of the cooling source, but also multiple power transmission and transformation equipment such as power transmission cables, transformers, switchgears, current limiters and shunt reactors With a common cooling source Can be cooled in bulk, it is possible to cool efficiently than the case of disposing the cooling source for each transmission substation equipment.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a first embodiment of a transmission and substation facility according to the present invention.
FIG. 2 is a schematic view showing a connection form between the refrigerant buffer tank and the low-temperature refrigerator according to the first embodiment.
FIG. 3 is a schematic view showing another connection form of the refrigerant buffer tank and the low-temperature refrigerator according to the first embodiment.
FIG. 4 is a schematic view showing still another connection form between the refrigerant buffer tank and the low-temperature refrigerator according to the first embodiment.
FIG. 5 is a configuration diagram showing a second embodiment of the transmission and transformation equipment according to the present invention.
FIG. 6 is a configuration diagram showing a third embodiment of the transmission and transformation equipment according to the present invention.
FIG. 7 is a configuration diagram showing a fourth embodiment of the transmission and transformation equipment according to the present invention.
FIG. 8 is a configuration diagram showing a fifth embodiment of the transmission and transformation equipment according to the present invention.
FIG. 9 is a configuration diagram showing a sixth embodiment of the transmission and transformation equipment according to the present invention.
FIG. 10 is a configuration diagram showing a seventh embodiment of the transmission and transformation equipment according to the present invention.
FIG. 11 is a configuration diagram showing an eighth embodiment of the transmission and transformation equipment according to the present invention.
FIG. 12 is a configuration diagram showing a ninth embodiment of the transmission and transformation equipment according to the present invention.
FIG. 13 is a block diagram showing a tenth embodiment of the transmission and transformation equipment according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Substation 11 Power transmission cable 12 Power transmission cable 13 Transformer 14a, 14b Switchgear 15, 15a, 15b Current limiter 16 Shunt reactor 17, 17a-17c Circulation pump 18, 18a-18d Cooling piping 19, 19a-19d Cooling source 20 Refrigerant buffer tank (refrigerant storage tank)
21, 21a to 21c Low temperature refrigerator 22 Return pipe 23 Heat exchanger 24 Cooling pipe 25 Pipe 26 Bushing 27 Connection line 30 Switchgear 31 Circuit breaker 32 Disconnector 33 Transformer 34 Lightning arrester 35 Grounding device 37 Rectifier type current limiter 38 Rectifier bridge 39 DC reactor 40 Cryogenic container 42 Leakage sensor 43 Signal line 44 Monitoring device 45 Current detector

Claims (5)

In the substation where voltage conversion is performed to transmit power from the upper system on the power station side to the lower system on the customer side, and in the transmission and substation equipment where transmission and substation equipment is installed in each switching station where the transmission system is allocated, stored cold refrigerant for cooling the superconducting device of substation equipment, including the superconducting device and the refrigerant storage tank that will be connected via a cooling pipe, and a low-temperature refrigerator for cooling the low-temperature refrigerant in the refrigerant storage tank, The transmission and transformation equipment is superconducting, voltage conversion transformer, circuit breaker, disconnector, switch composed of busbar, shunt reactor for phase adjustment, current limiter for suppressing short circuit current, and upper and lower The power transmission / transformation equipment is selected from a plurality of types, and the low-temperature refrigerator and the refrigerant storage tank are shared between the transmission / transformation equipment, and the refrigerant storage tank is the substation. Or in switchyard Transmission and substation facilities, and characterized in that it is location. In claim 1 Symbol placement transmission substation equipment of the transmission cable is a superconducting transmission cable, provided with a plurality of circulation pumps for feeding the low-temperature coolant from the coolant reservoir to the superconducting power transmission cable, a plurality installing the cold refrigerator Transmission and substation equipment characterized by In claim 1 Symbol placement transmission substation equipment of, one the current limiting device is a rectification type fault current limiter constituted by the DC reactor and the rectifier bridge, arranging the rectifier bridge in a normal temperature environment, the DC reactor Power transmission and substation equipment characterized by cooling only with a low-temperature refrigerant. In claim 1 Symbol placement transmission substation equipment of the transmission cable is a superconducting transmission cable, at a predetermined distance in the longitudinal direction of the superconducting power transmission cable disposed leakage sensor at a plurality of positions, a detection signal of the leakage sensor A substation facility for detecting refrigerant leakage based on the above. 5. The transmission / transformation equipment according to claim 4 , further comprising a current detector that detects a value of a current flowing through the superconducting power transmission cable, based on both detection signals obtained from the current detector and the leakage sensor. Transmission and substation equipment characterized by the presence or absence of leakage and the location of the leakage.

Images