JP7380377B2 - Power receiving and transforming equipment that can change the receiving voltage and how to change the receiving voltage - Google Patents

Description

The present invention relates to power receiving and transforming equipment, a transformer, and a method of changing the power receiving voltage, and particularly relates to a transformer that can receive power at a different power receiving voltage, a power receiving and transforming equipment having the transformer, and a method of changing the power receiving voltage of the power receiving and transforming equipment. Regarding.

When a power consumer receives power transmitted by a general power transmission and distribution company, converts it to the desired distribution voltage, and distributes it to the premises, the customer must use the same receiving voltage as the power transmission voltage of the general power transmission and distribution company. It is necessary to prepare power receiving and transforming equipment that can receive electricity. FIG. 6 shows the configuration of a general power receiving and transforming equipment 90.

The power receiving and transforming equipment 90 is a switch that is a power distribution equipment that receives power from each of the two power transmission lines 94, a main line and a backup line, steps down the power from the received voltage to a distribution voltage using a transformer 92, and distributes the power to the premises. Power is supplied to gear 93. Since there are multiple types of power transmission voltage, such as 154 kV, 66 kV, and 6 kV, the consumer needs to prepare each device of the power receiving and transforming equipment 90, such as the switch 91 and the transformer 92, that is compatible with the power receiving voltage.

By the way, a corresponding power capacity is set for each power transmission voltage, and if a consumer desires an amount of electricity that exceeds the power capacity corresponding to the current power reception voltage, it is necessary to change to a higher power reception voltage. . Furthermore, if a power transmission system with a desired power transmission voltage is not installed in the vicinity of the consumer, it is necessary to wait until the power transmission system is installed before changing the receiving voltage.

In this way, when the power transmission voltage of the general power transmission and distribution company is changed, the power receiving voltage of the consumer also needs to be changed, and this involves changing the power receiving and transforming equipment. However, the transformation ratio of the transformer 92 of the power receiving and transforming equipment 90 cannot be changed after the equipment is manufactured. Therefore, consumers need to install new power receiving and transforming equipment, which incurs huge construction costs and time. During the construction period, it was necessary to stop the power supply to the switchgear 93 for distributing power to the premises, or to supply power from another power receiving and transforming facility. Additionally, power receiving and transforming equipment is often used for more than 30 years, but after the new power receiving and transforming equipment starts receiving power, the old power receiving and transforming equipment becomes unused and unused equipment, or is likely to be removed. If it is removed, further removal costs will be incurred.

For this reason, there has been a demand for transformers and power receiving/transforming equipment that can change the receiving voltage. Additionally, there was a need for a method that could change the receiving voltage while keeping the interruption period of the entire power receiving and substation equipment short.

The above problem is solved by the use of transformers (112, 122, 212, 222) each having a plurality of input terminals (21, 23) corresponding to different receiving voltages and an output terminal (22) that outputs a distribution voltage; A power receiving and transforming equipment (10) comprising lines (100, 200), each line having a plurality of input terminals (21, 23) each corresponding to a different receiving voltage, and an output terminal outputting a distribution voltage. Power receiving and transforming equipment ( 10).

In other words, by using a transformer with multiple input terminals that correspond to different receiving voltages, it is possible to change the transformation ratio simply by changing the wiring, so there is no need to replace the transformer even if the receiving voltage is changed. There's no need to. Furthermore, by using upstream switching equipment that can operate with a plurality of receiving voltages, the upstream switching equipment can be used as is even if the receiving voltage is changed. In this way, by adopting power receiving and transforming equipment that can handle multiple receiving voltages, it became necessary to change the receiving voltage of the customer's power receiving and transforming equipment when the general power transmission and distribution company's power transmission voltage was changed. Even in such cases, existing power receiving and substation equipment can be used as is.
Here, "upstream of the plurality of input ends" of the transformer means that the transformer is located on the input side of the line rather than the plurality of input ends of the transformer on the power circuit. Moreover, "switching equipment" means equipment that has the function of connecting and disconnecting a power circuit, such as a switch or a circuit breaker. Therefore, "upstream switching equipment" means equipment that is placed on a power circuit between multiple input ends of a transformer and the input end of a line, and has the function of connecting and disconnecting the power circuit. do.

Moreover, the above-mentioned problem is a method (40) of changing the receiving voltage of the power receiving and transforming equipment (10) that can correspond to the above-mentioned receiving voltage, and which includes some lines (100, 200) among the plurality of lines (100, 200). 200) and the input end (23) of the transformer (212, 222) connected to the upstream switchgear of some lines (200) after the change. A step (52) of changing the input terminal (21) corresponding to the received power voltage, and a step (55) of switching the input voltage of the upstream switching equipment of some lines (200) to the changed received power voltage. a step (56) of closing the upstream switchgear of the line (200) of the section; a step (61) of opening the upstream switchgear of the remaining line (100) of the plurality of lines (100, 200); a step of changing the input end (23) of the transformer (112, 122) connected to the upstream switching equipment of the line (100) to the input end (21) corresponding to the changed receiving voltage; The problem can also be solved by a method including a step (62) of switching the input voltage of the upstream switchgear of the line (100) to the changed receiving voltage.

In other words, although power receiving and substation equipment has multiple lines, the receiving voltage must be changed for each line in order to improve reliability and to prevent power outages due to power supply from the power receiving and substation equipment stopping in the event of a circuit failure. This makes it possible to change the power receiving voltage while keeping the period during which the entire power receiving and substation equipment is cut off to a short period.
Here, "opening the upstream switching equipment" means operating the upstream switching equipment so as to interrupt the circuit between the input end of the line and the input end of the transformer. Therefore, when the upstream switching equipment includes a plurality of switching equipment, at least one or more of the switching equipment may be opened to interrupt the circuit between the input end of the line and the input end of the transformer; It is not necessary to open all switching equipment.
On the other hand, "closing the upstream switching equipment" means operating the upstream switching equipment so as to connect the circuit between the input end of the line and the input end of the transformer. Therefore, if there are multiple power paths in parallel between the input end of the line and the input end of the transformer, it is sufficient to close the switchgear equipment on at least one path; It is not necessary to close all switching equipment.

Further, in the above method, when the upstream switchgear of some of the lines (200) is open, the upstream switchgear of one of the lines (200) and the transformer (212, 222) ) and a step (53) of connecting the VCT (205) between the remaining lines (100) when the upstream switching equipment of the remaining lines (100) is open. 105) and removing (63).

It is desirable to install only one VCT in the power receiving and transforming equipment, that is, only on the active line that actually receives and transforms power among the plurality of lines. Since the power receiving voltage is changed on a line-by-line basis, it is possible to change the VCT in accordance with the change in the active line.

1 is a schematic configuration diagram of power receiving and transforming equipment 10 according to the present invention. 1 is a schematic configuration diagram of transformers 112, 122, 212, 222 according to the present invention. FIG. 3 is a state diagram of a method for changing a received voltage according to the present invention. FIG. 3 is a state diagram of a method for changing a received voltage according to the present invention. FIG. 3 is a state diagram of a method for changing a received voltage according to the present invention. 3 is a flowchart of a method for changing a received power voltage according to the present invention. This is a modification of switchgear switching. It is a schematic block diagram of the conventional power receiving and transforming equipment 90.

FIG. 1 shows a schematic configuration diagram of power receiving and transforming equipment 10 that is an embodiment of the present invention. The power receiving and transforming equipment 10 is a power receiving and transforming equipment capable of receiving two different power transmission voltages of 154 kV and 66 kV, converting the received power voltage into a 22 kV distribution voltage, and supplying the power to a power distribution device of a consumer.

The power receiving and transforming equipment 10 includes two lines, a first line 100 and a second line 200, with the first line 100 connected to the power transmission line 11 and the second line 200 connected to the power transmission line 12. Each line 100, 200 has an input terminal 131, 231 that receives power from the power transmission line 11, 12, a switch 101, 201 connected to the input terminal 131, 231, and an output side of the switch 101, 201. It includes two transformers 112, 122, 212, and 222 connected in parallel. The outputs of the transformers 112, 122, 212, 222 can be connected to a consumer's power distribution device, such as the switchgear 13, via the output ends 115, 125, 215, 225 of each line 100, 200.

In the example of FIG. 1, since the first line 100 is a regular line, the output end 115 of the first line 100 is connected to the switchgear 13, and the VCT 105 is connected between the switch 101 and the transformers 112 and 122. is set up. Connecting lines are installed between the two lines 100 and 200 on the input side and output side of the VCT 105, respectively. A switch 103 is connected to the first line 100 side of the connection line on the input side, and a switch 203 is connected to the second line 200 side. Further, a switch 104 is connected to the first line 100 side of the output side communication line, and a switch 204 is connected to the second line 200 side. Further, on the input side of the VCT 105, switches 106 and 107 are arranged in series with the VCT 105 across the branch point with the connection line, and on the output side of the VCT 105, a switch 108 is arranged. Switches 206, 207, and 208 are also arranged at positions on the second line 200 that correspond to the switches 106, 107, and 108 on the first line 100.

The switches 101 and 201 are switches that connect and disconnect the power transmission lines 11 and 12. When the switches 101 and 201 are opened, the power transmission lines 11 and 12 and the lines 100 and 200 are connected, and when the switches 101 and 201 are opened, they are disconnected. In the example shown in FIG. 1, the switch 101 of the first line, which is a regular line, is closed and connected to the power transmission line 11, and the first line 100 is active. On the other hand, since the second line 200 is a protection line, the switch 201 of the second line 200 may be opened and disconnected from the power transmission line 12, and in that case, the second line 200 becomes inactive. Note that when power is supplied from the second line, which is a backup line, the switch 201 is closed and connected to the power transmission line 12, and the second line 200 is activated. On the other hand, the switch 101 of the first line 100 is opened and disconnected from the power transmission line 11, making the first line 100 inactive.

The switches 101 and 201 and the switches 106, 107, 108, 206, 207, and 208 are designed to be able to open and close AC power up to 154 kV. Therefore, the switches 101 and 201 can operate at either the receiving voltage of 66 kV or 154 kV. In this way, by using a switch that can operate at the maximum power reception voltage among a plurality of different levels of power reception voltage, it becomes possible to cope with a plurality of different power reception voltages that are lower than the maximum power reception voltage.

FIG. 2 shows a schematic configuration of the transformers 112, 122, 212, and 222. Each transformer 112, 122, 212, 222 has two input terminals 21, 23, each corresponding to a different receiving voltage, and one output terminal 22 that outputs a distribution voltage. More specifically, the input terminal 21 is an input terminal for inputting a receiving voltage of 154 kV, and the input terminal 23 is an input terminal for inputting a receiving voltage of 66 kV. The received power is selectively input to either of the two input terminals 21, 23 based on the power transmission voltage of the power transmission lines 11, 12. The received power input to either of the input terminals 21 and 23 is transformed to a distribution voltage of 22 kV and output from the output terminal 22.

The communication switches 103, 104, 203, and 204 are switches for connecting the communication lines when the power received on one line is temporarily transferred to the other line and transformed. When the switches 104 and 204 close, the connection line on the input side of the VCT 105 becomes conductive, and when the switches 104 and 204 close, the connection line on the output side of the VCT 105 becomes conductive.

The VCT 105 is an instrument transformer to which a power meter for measuring the amount of power flowing through the utility line is connected. It is desirable to install only one VCT 105 in the power receiving and transforming equipment, that is, only on the active line that actually receives and transforms power among the plurality of lines. The VCT 105 installed in the first line 100 supports a receiving voltage of 66 kV.

Circuit breakers are installed on the input and output sides of the VCT 105 and the transformers 112, 122, 212, and 222 to protect these devices from excessive current caused by short circuits and the like. That is, a circuit breaker 102 is provided on the input side of the VCT 105, circuit breakers 111 and 121 are provided between the VCT 105 and the two transformers 112 and 122 of the first line 100, and circuit breakers 111 and 121 are provided on the output sides of the transformers 112 and 122, respectively. Circuit breakers 113 and 123 are installed respectively.

In the example shown in FIG. 1, a VCT is not installed on the second line 200, which is a protection line, but the circuit breaker 100 of the first line 100 is installed so that a VCT can be attached when the second line 200 is used. , 111, and 121, circuit breakers 202, 211, and 221 are installed, respectively. When used for the second line 200, a VCT is connected between the switch 207 and the switch 208. Furthermore, circuit breakers 213 and 223 are installed on the output sides of the transformers 212 and 222, respectively.

Furthermore, circuit breakers 114, 124, 214, 224 are installed at the output ends 115, 125, 215, 225 of each line 100, 200 to protect the power distribution equipment of customers such as the switchgear 13 from excessive current. ing. The circuit breakers 102, 111, 121, 202, 211, and 221 are all designed to be able to operate at either a receiving voltage of 66 kV or 154 kV.
The switches and circuit breakers described above correspond to the "switching equipment" in the present invention. In addition, in the power receiving and transforming equipment 10, switches 101, 103, 104, 106, 107, 108, 201, 203, 204, 206 located upstream of the transformers 112, 122, 212, 222 on the power circuit , 207, 208 and the circuit breakers 102, 111, 121, 202, 211, 221 correspond to "upstream switching equipment" in the present invention.

As explained above, by using a transformer that has multiple input terminals that correspond to different receiving voltages, it is possible to change the transformation ratio simply by changing the wiring. There is no need to replace the transformer. Furthermore, by using upstream switching equipment that can operate with a plurality of receiving voltages, the upstream switching equipment can be used as is even if the receiving voltage is changed. In this way, by adopting power receiving and transforming equipment that can handle multiple receiving voltages, it became necessary to change the receiving voltage of the customer's power receiving and transforming equipment when the general power transmission and distribution company's power transmission voltage was changed. Even in such cases, existing power receiving and substation equipment can be used as is.

Next, regarding the method of changing the receiving voltage according to the present invention, the method 40 for changing the receiving voltage of the power receiving and transforming equipment 10 from 66 kV to 154 kV will be described with reference to the state diagrams in FIGS. I will explain while doing so. The method 40 includes a change step 50 on the second line 200 side and a change step 60 on the first line 100 side. In the state diagrams of FIGS. 3a to 3c, active states are shown by solid lines and inactive states are shown by broken lines.

In the initial state before the change, 66 kV power is flowing through each power transmission line 11 and 12, and the power receiving and transforming equipment 10 converts the 66 kV receiving voltage to 22 kV distribution voltage using the first line 100. , is supplied to the switchgear 13 which is the power distribution equipment of the consumer. Power of 66 kV is input to each of the transformers 112, 122, 212, and 222 from the input terminal 23.

First, the upstream switching equipment of the second line 200 is opened to disconnect the second line 200 from the power transmission line 12 (step 51). Specifically, switches 201 , 206 , 207 , and 208 and circuit breakers 202 , 211 , and 221 are opened to disconnect second line 200 from power transmission line 12 . The state at this time is shown in FIG. 3a.

Next, the inputs of the two transformers 212 and 222 connected to the upstream switching equipment of the second line 200 are changed from the input terminal 23 for 66 kV to the input terminal 21 for 154 kV (step 52). More specifically, the cables or overhead wires connecting the circuit breakers 211 and 221 and the input ends 23 of the transformers 212 and 222 are switched to the input ends 21. By this switching, the input terminals 23 of the transformers 212 and 222 connected to the switches 201, 206, 207, 208 and the circuit breakers 202, 211, 221 of the second line 200 correspond to the changed receiving voltage of 154 kV. The input terminal 21 is changed to

Further, a 154 kV VCT 205 is connected between the upstream switching equipment and the transformer. Specifically, VCT 205 is connected between switch 207 and switch 208 (step 53). As a result, all the power flowing through the second line 200 flows through the VCT 205. However, at this point, the second line 200 is disconnected from the power transmission line 12, so no current flows.

Further, the output of the power receiving and transforming equipment 10 is changed from the output end 115 of the first line 100 to the output end 215 of the second line 200 (step 54). More specifically, the cable connecting the output end 115 and the switchgear 13 is removed, and the output end 215 and the switchgear 13 are connected. The changed state is shown in Figure 3b. Instead of changing the cable connection, the outputs of the output ends 115 and 215 are connected to the switchgear 13 via a switch, and the switch connected to the output end 115 is opened to connect the output end 215 to the output end 215. The output end of the power receiving and transforming equipment 10 may be changed by closing the switch. Furthermore, as shown in FIG. 5, by connecting another switchgear 14 to the output end 215 in advance, turning off the circuit breaker 114 and the switchgear 13, and turning on the circuit breaker 214 and the switchgear 14, Switching may also be performed. When changing the output end of the power receiving and transforming equipment 10, it is necessary to stop the entire power receiving and transforming equipment 10.

The upstream switching equipment, such as switches 201, 206, 207, 208, communication switches 203, 204, and circuit breakers 202, 211, 221, can operate at either 66 kV or 154 kV, so the equipment There is no need to replace the power supply itself, but the control settings can be changed to 154kV if necessary.

Next, the input voltage of the upstream switching equipment of the second line 200 is changed to 154 kV, which is the changed receiving voltage (step 55). Specifically, the input voltage of the switch 201 is changed to 154 kV, which is the changed receiving voltage. This change may be implemented by changing the transmission voltage of the power transmission line 12 connected to the input end 231 of the second line 200 to 154 kV, or by changing the input of the second line 200 to a transmission voltage of 66 kV. It may be implemented by switching from electric wires to 154 kV power transmission lines. At this point, the power receiving voltage (66 kV) of the first line 100 and the power receiving voltage (154 kV) of the second line 200 are different.

Thereafter, the upstream switching equipment of the second line 200 is closed (step 56). Specifically, switches 201, 206, 207, 208 and circuit breakers 202, 211, 221 are closed. By closing the switches 201, 206, 207, 208 and the circuit breakers 202, 211, 221, the second line 200 becomes active, and the power receiving and substation equipment 10 receives AC power with a receiving voltage of 154 kV from the power transmission line 12. However, AC power with a distribution voltage of 22 kV can be supplied to the switchgear 13. This completes the process 50 of changing the second line 200.

Subsequently, a step 60 of changing the first line 100 is performed. First, the upstream switching equipment of the first line 100 is opened to disconnect the first line 100 from the power transmission line 11 (step 61). In the concrete boat, switches 101, 106, 107, and 108 and circuit breakers 102, 111, and 121 are opened to disconnect the first line 100 from the power transmission line 11. Next, the inputs of the two transformers 112 and 122 connected to the upstream switching equipment of the first line 100 are changed from the 66 kV input terminal 23 to the 154 kV input terminal 21 (step 62). More specifically, the cable or overhead wire connecting the circuit breakers 111, 121 and the input ends 23 of the transformers 112, 122 is switched to the input end 21. By this switching, the 66kV input terminal 23 of the transformer 112, 122 connected to the switches 101, 106, 107, 108 and the circuit breakers 102, 111, 121 of the first line 100, the changed receiving voltage is 154kV. The input terminal 21 is changed to correspond to the input terminal 21 . Furthermore, the 66kV VCT 105 connected to the first line 100 is removed (step 63). The changed state is shown in Figure 3c.

The switches 101, 106, 107, 108, communication switches 103, 104, and circuit breakers 102, 111, 121 can operate at either 66kV or 154kV, so there is no need to replace the entire device, but the control settings Switch to 154kV as necessary.

Next, the input voltage of the upstream switching equipment of the first line 100 is changed to 154 kV, which is the changed receiving voltage (step 65). Specifically, the input voltage of the switch 101 is changed to 154 kV, which is the changed receiving voltage. This change may be implemented by changing the power transmission voltage of the power transmission line 11 connected to the input end 131 of the first line 100 to 154 kV, or by changing the input of the first line 100 to a transmission voltage of 66 kV. It may be implemented by switching from electric wires to 154 kV power transmission lines. Thereafter, if necessary, the upstream switching equipment of the first line 100 is closed to bring the first line 100 into an active state. Specifically, switches 101, 106, 107, and 108 and circuit breakers 102, 111, and 121 are closed to bring first line 100 into an active state. This completes the process 60 of changing the first line 100.

When using gas insulated switchgear (GIS) for 66kV and 154kV, lightning arresters (LA), voltage current transformers (VCT), etc. It may be necessary to connect overhead lines, replace current transformers (CTs) and voltage transformers (VTs), check the short-circuit current and breaking capacity of transmission lines, and conduct relay tests.

In addition, in the method 40 described above, the regular line after the change becomes the second line, but if you want to use the first line 100 as a regular line, the VCT connection is not performed in the step 50 of changing the second line 200. (In other words, step 53 is not performed), and instead, in the modification step 60 of the first line 100, a 154kV VCT 205 is connected in place of the removed 66kV VCT 105 (in other words, step 63 is not a removal of the VCT). , VCT replacement).

Further, since there is no change in the regular line before or after changing the power receiving voltage, there is no need to change the output end of the power receiving and transforming equipment 10 (step 54). Furthermore, since the second line 200 as a backup line may remain in an inactive state, at the end of the change process 50 of the second line 200, the switches 201, 206, 207, 208 and the circuit breaker 208, which are upstream switching equipment, are , 211, 221 need not be closed. That is, step 56 does not necessarily need to be performed. Instead, at the end of the modification step 60 of the first line 100 (ie after step 65), it is necessary to close the upstream switchgear of the first line 100 and to make the second line 200 active. That is, it is necessary to close switches 101, 106, 107, and 108 and circuit breakers 102, 111, and 121 to activate second line 200.

As explained above, by changing the receiving voltage for each line of power receiving and transforming equipment that has multiple lines, it is possible to change the receiving voltage while keeping the entire power receiving and transforming equipment shut down to a short period of time. Become.

Although the transformer, the power receiving and transforming equipment, and the method of changing the power receiving voltage according to the present invention have been described above, the present invention is not limited to the above embodiments, and the concept of the present invention and the patent claims are Including all aspects within the scope. For example, in the embodiment described above, a three-turn transformer is used to selectively input receiving voltages of 154 kV and 66 kV and output a distribution voltage of 22 kV. A multi-turn transformer having more input terminals and output terminals may be used in order to input the received power voltage and output the multi-level distribution voltage such as 22 kV, 400 V, etc.

Further, in the embodiment described above, since the number of lines in the power receiving and transforming equipment 10 is two, the receiving voltage is changed one line at a time, but the number of lines may be three or more. In this case, the lines in the power receiving and transforming equipment are divided into two groups, and after implementing the change process corresponding to the change process 50 for the first group, the change process 60 is performed for the second group. Corresponding modification steps may also be carried out. In other words, each of "some of the lines among the plurality of lines" and "the remaining lines among the plurality of lines" in the claims does not need to be one line, but may include a plurality of lines. It may also be a line group that includes.

Further, in the embodiments described above, the present invention has been described using as an example the power receiving and transforming equipment 10 in which the power receiving method is a regular/standby method, but a power receiving method such as a loop power receiving method or a spot network method may be used. Further, the switches 107, 108, 207, 208 above and below the VCTs 105, 205 and the switches 104, 204 for communication between lines may be changed to circuit breakers. Further, the busbar structure may be a single busbar or a double busbar. Furthermore, in the embodiment described above, two transformers are installed for each line, but it may be one, three or more.

In addition, in the embodiments described above, the transformers 112, 122 are powered when the first line 100 is active and are not functioning when the first line 100 is inactive, but by closing the communication switches 104, 204. , power from the second line 200 can be supplied to the transformers 112, 122 even when the first line 100 is inactive. Similarly, the transformers 212, 222 are energized when the second line 200 is active and are inoperative when inactive, but by closing the contact switches 104, 204, the second line 200 It becomes possible to supply power from the first line 100 to the transformers 212 and 222 even when the first line 100 is inactive.

If the first line 100 and the second line 200 are active, or if the transformers 112, 122, 212, 222 are active, the The second line 200 side deactivates the power distribution device by cutting off the circuit breakers 214 and 224. If it is desired to avoid the power distribution device distributing power from the second line 200 side becoming inactive, it is desirable to switch in advance to the power distribution device distributing power from the active first line 100 side.

DESCRIPTION OF SYMBOLS 10, 90... Power receiving and transforming equipment, 11, 12, 94... Power transmission line, 13, 14... Switchgear, 21, 23... Input end of transformer, 22... Output end of transformer, 92, 112, 122, 212, 222... Transformer, 100, 200... Line, 102, 111, 113, 114, 121, 123, 124, 202, 211, 213, 214, 221, 223, 224... Circuit breaker,
103,104,203,204...Communication switch, 105,205...VCT (instrument transformer), 91,101,103,104,106,107,108,201,203,204,206,207,208 ...Switch, 115, 125, 215, 225...Output end of line, 131,231...Input end of line

Claims (3)

A power receiving and transforming facility equipped with multiple lines, where each line is
a transformer having a plurality of input terminals each corresponding to a different receiving voltage, and an output terminal outputting a distribution voltage;
upstream switching equipment that is located upstream of the plurality of input ends and that can be operated at different receiving voltages;
Equipped with
Each of the plurality of lines has the separate transformer and the upstream switching equipment ,
Power receiving and substation equipment. A method for changing the receiving voltage of the power receiving and transforming equipment according to claim 1, comprising:
a first changing step of changing the power reception voltage of some of the plurality of lines;
After the first changing step, a second changing step of changing the receiving voltage of the remaining lines among the plurality of lines;
including;
The first changing step includes:
opening the upstream switching equipment of some of the lines;
changing the input end of the transformer connected to the upstream switching equipment of the part of the line to the input end corresponding to the changed receiving voltage;
a step of switching the input voltage of the upstream switching equipment of some of the lines to the changed receiving voltage;
closing the upstream switching equipment of some of the lines;
including;
The second changing step is
opening the upstream switching equipment of the remaining lines;
changing the input end of the transformer connected to the upstream switching equipment of the remaining line to the input end corresponding to the changed receiving voltage;
switching the input voltage of the upstream switching equipment of the remaining line to the changed receiving voltage;
including,
Method. A method for changing the receiving voltage of power receiving and transforming equipment having multiple lines, the method comprising:
Each line is
a transformer having a plurality of input terminals each corresponding to a different receiving voltage, and an output terminal outputting a distribution voltage;
upstream switching equipment that is located upstream of the plurality of input ends and that can be operated at different receiving voltages;
Equipped with
The method includes:
opening upstream switching equipment for some of the plurality of lines;
changing the input end of the transformer connected to the upstream switching equipment of the part of the line to the input end corresponding to the changed receiving voltage;
a step of switching the input voltage of the upstream switching equipment of some of the lines to the changed receiving voltage;
closing the upstream switching equipment of some of the lines;
opening upstream switching equipment for the remaining lines among the plurality of lines;
changing the input end of the transformer connected to the upstream switching equipment of the remaining line to the input end corresponding to the changed receiving voltage;
switching the input voltage of the upstream switching equipment of the remaining line to the changed receiving voltage;
including;
The method includes:
connecting a VCT between the upstream switching equipment of one of the partial lines and the transformer when the upstream switching equipment of the partial lines is open;
removing the VCT connected to the remaining line when the upstream switching equipment of the remaining line is open;
further including,
method .

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