JP7332846B1 - High-voltage power receiving equipment with sectional switches - Google Patents

Abstract

An object of the present invention is to provide a sectioning switch that can cut off an overcurrent caused by an accident in a business office by the operator without cutting off by the electric power company, thereby reducing spillover accidents. . A sectioning switch provided on the side of a business operator near a demarcation point of responsibility between an electric power company and a business operator receiving high voltage from the electric power company, the sectioning switch comprising at least a control Equipped with a power transformer, a lightning arrester, an overcurrent detector, and a current interrupting device, the current interrupting device is provided with a vacuum switch composed of a vacuum valve, and is arranged between the power supply side and the load side. The overcurrent detector is arranged on the power supply side so as to detect an overcurrent on the power supply side, and the lightning arrester and the control power transformer are connected closer to the power supply than the vacuum switch. It is characterized by [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to a section switch and a high-voltage power receiving facility equipped with the section switch, and in particular, a section switch capable of reducing spillover accidents and a section switch capable of reducing spillover accidents. It relates to a high voltage power receiving facility equipped with.

2. Description of the Related Art Conventionally, there is known a high voltage power receiving facility in which a business operator receives a high voltage (6600V) supplied by an electric power company and transforms it into a low voltage (200V, 100V). FIG. 4 is a diagram illustrating a general configuration of such high-voltage power receiving equipment.

In FIG. 4, a high voltage of 6600 V is supplied from a substation (not shown) of an electric power company through a lead-in line 110 to a high-voltage power receiving facility 100 on the business operator's side. The high-voltage power receiving equipment 100 includes a sectional switch 120 and an SOG control device 140 provided on the premises No. 1 pillar P, an output high-voltage cable 130 that outputs a high voltage of 6600 V from the sectional switch 120 to the cubicle C, and an output high-voltage cable. A lightning arrester (not shown) or the like connected to 130 is provided. The cubicle C is a transformer facility that transforms the received high voltage of 6600V into low voltages of 200V and 100V and supplies it to the factory F of the operator.

The division switch 120 is a device provided at the lead-in point when a high voltage (6600 V) is drawn from the electric power company to the office, and is installed near the demarcation point of responsibility between the electric power company and the business operator. The demarcation point of responsibility is the connection portion (primary side power supply connection point) between the input high voltage cable 200 on the power supply side of the division switch 120 and the lead-in line 110 of the electric power company. At this point of demarcation of responsibility, either the electric power company or the business operator is responsible for the accident. Become. In FIG. 4, if an accident occurs on the left side of the one-dot chain line, the power company is responsible, and if an accident occurs on the right side of the one-dot chain line, the business operator is responsible. The "demarcation point of responsibility" is also referred to as "demarcation point of liability and property."

Here, if a short-circuit accident occurs in the high-voltage power receiving equipment 100 on the business operator side, for example, a large current of 10,000 A (amperes) flows, the electric power company cuts off the power distribution system and stops the power supply. ing. Since the power supply from the electric power company is usually shared by multiple companies, power outages are not limited to the company where the accident occurred, but other companies that receive power in common from the same power company. of operators will also experience power outages. Since the entire responsibility for the accident is borne by the operator who caused the accident, this operator will pay huge damages due to the blackout of other operators. Such an accident is called a spillover accident. Since the business operator that caused the accident has a huge liability for damage compensation, the spillover accident has become a social problem, and measures to prevent this spillover accident from occurring are desired. .

FIG. 5 is a schematic diagram showing features of a prior art section switch, FIG. 6 is a circuit diagram of a conventional general section switch 120, and FIG. 1 is a diagram for explaining the outline of the main configuration of FIG. In FIG. 5, a single phase is shown for convenience of explanation, but in reality, it is a three-phase alternating current as shown in FIGS. In FIGS. 5 to 7, the load side indicates the operator's side, and the power source side indicates the power company's side. Symbol ZCT is a zero-phase current transformer that detects an earth leakage current and transmits a detection signal to an SOG control device 140 provided outside the sectional switch 120 . Symbol OCR is an overcurrent detector mounted on the load-side internal electrode 240 , detects overcurrent and transmits a detection signal to the SOG control device 140 . A control power transformer VT receives a high voltage of 6600 V supplied from an electric power company from the load-side internal electrode 240 , transforms it to 100 V, and supplies it to the SOG control device 140 . Symbol LA is a lightning arrester connected to the load-side internal electrode 240, and releases a lightning surge to the ground through the ground line 210 when the sectional switch 120 is struck by lightning. A reference numeral 160 denotes a trip mechanism, which opens the open/close switch SW of the current interrupting device 150 by a control signal from the SOG control device 140 . The open/close switch SW that constitutes the current interrupting device 150 includes a blade B that is a copper plate-shaped movable electrode (also referred to as a movable contact) and a copper fixed electrode (also referred to as a fixed contact) 180. is configured to be openable and connectable to the fixed electrode 180 by rotating the , and functions as a switch that cuts off the leakage current. In addition, since the division switch 120 is a well-known technique generally used, the detailed description about each component is omitted as much as possible.

When a leakage current of about 200 mA occurs, the current interrupting device 150 sends a control signal from the SOG control device 140 that receives a detection signal from the zero-phase current transformer ZCT to the trip mechanism 160, thereby The trip coil TC (see FIG. 6) and an energized spring (not shown) are operated, and the connecting shaft 170 that connects the trip mechanism 160 and the blade B is operated to automatically move the blade B (movable electrode) is released from the fixed electrode 180, the power supply from the power supply side can be interrupted by the section switch 120, so that it is possible to prevent a spillover accident. If an overcurrent occurs, this configuration will generate an arc even if the blade B is opened. Therefore, when this overcurrent occurs, the electric power company is also configured to detect and cut off the current. stop. For this reason, as described above, when a short-circuit accident occurs at a business operator, the electric power company shuts down the distribution system and stops the supply of electric power. A number of businesses that receive electricity will be affected by blackouts.

Therefore, techniques for avoiding the spillover accident due to the large current as described above have been proposed. For example, Patent Literature 1 describes that "the purpose is to provide a high-voltage collective power receiving facility that can prevent a spillover accident that causes inconvenience to other power receiving facilities" (see paragraph "0009"). A high-voltage collective power receiving facility that steps down the power to low-voltage power and distributes it to each household within the power receiving user, and includes a power receiving device that has a high-voltage air load switch connected to the high-voltage distribution line and a transformer that converts the high-voltage power to low-voltage power. and the power receiving device has a load break switch with a cutoff function that detects an accident occurring in the high voltage bulk power receiving equipment and cuts off the power transmission function"("Claim 1 ) is described.
In the present invention, a business operator is a business operator that receives a high voltage of, for example, 6600 V from an electric power company, such as a factory or a large-scale commercial facility, and is not a general household that receives power of 200 V or 100 V. . The same applies hereinafter.

Registered Utility Model No. 3198692

In Patent Document 1, "GBT in FIG. 2 indicates a load break switch 13 with a breaking function. The load break switch with a breaking function in the present invention is a private electrical equipment (refers to equipment in an apartment building that receives high voltage collectively). If a failure (failure) spreads to the distribution line and causes a power outage, other electrical equipment will also be out of power, which will have a major impact on society. (paragraph 0020, see FIG. 2), and "A variety of load switches can be used as the load switch with a breaking function without any particular limitations as long as they perform the above functions. can be used, but a ground-fault trip type high-pressure gas load switch with a breaker function manufactured by Togami Electric Works Co., Ltd. can be exemplified.” (See paragraph “0021”). "Load switch" is not currently manufactured due to the risk of gas leaking into the atmosphere.

Further, although not explicitly stated in Patent Document 1, as described above (see FIGS. 4 to 7), the conventional sectioning switch 120 includes a control power transformer VT, an overcurrent detector OCR, It is known that a lightning arrestor LA0 is provided, but these devices are connected to electrodes at a position on the load side of blade B. However, for example, if the factory F is a tea factory, the period of operation of the tea factory is limited to a short period of time in the summer, so the period of non-operation is long throughout the year. In a factory with a long non-operation period, such as this tea factory, the partitioning switch 120 is opened during the non-operation period, that is, the blade B is opened to achieve an economic effect. When the sectional switch 120 is opened, naturally there is no power supply from the power company to the sectional switch 120, so the control power supply transformer VT provided on the load side operates during the non-operating period. Therefore, the SOG control device 140 to which power is not supplied from the control power transformer VT also does not operate. Therefore, even if an overcurrent flows in from the power supply side (the lead-in line 110 side) for some reason, the SOG control device 140 cannot perform the overcurrent detection/cutoff control operation.

In addition, when the power supply side is struck by lightning during the non-operating period of factory F and a lightning surge enters between blade B of sectioning switch 120 and the demarcation point, blade B of current breaking device 150 is opened. Therefore, there is no escape from the lightning surge, and there is a risk that a short circuit will occur, causing a power outage at the power company's substation and causing a spillover accident.

For this reason, the present invention provides a sectional switch that can cut off an overcurrent caused by an accident in a business office by the operator without cutting off by the electric power company, thereby reducing spillover accidents. With the goal.

Further, the present invention aims to provide a sectional switch capable of discharging lightning surges and the like to the ground at all times even when the operator is not in operation at the time of a lightning strike, thereby reducing spillover accidents. aim.

Another object of the present invention is to provide a high-voltage power receiving facility capable of reducing spillover accidents by always operating the SOG operation control device even when the operator is not in operation. .

In order to achieve the above object, the invention according to claim 1 is a liability and property demarcation point provided on the side of a business operator who receives high voltage (6600 V) from a substation of an electric power company through a service line . In high-voltage power receiving equipment with sectional switches,
The sectional switch comprises at least a transformer for control power supply, a lightning arrester that releases a lightning surge that has flowed in from the power supply side to the ground through a ground line , an overcurrent detector, and a power cutoff device,
The overcurrent detector is connected to the primary side power supply connection point side of the lead-in line , the current breaker is a vacuum switch having a movable contact and a fixed contact in a vacuum valve, and the control power transformer is , transforms the supplied high voltage (6600 V) to a low voltage (100 V or 200 V), and supplies a low voltage ( 100V) is always energized to maintain a standby state .

According to the sectioning switch of the present invention, an overcurrent generated by an accident in a business office can be cut off by the operator without being cut off by the electric power company, so there is a remarkable effect of reducing spillover accidents. .

In addition, according to the sectioning switch of the present invention, even if the business operator is not operating during a lightning strike, a lightning surge or the like can be discharged to the ground. Play.

In addition, according to the sectioning switch of the present invention, even if the business operator is not in operation, the SOG operation control device can always be operated to control the opening of the sectioning switch, thereby reducing spillover accidents. It has a remarkable effect of being able to

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which shows the characteristic of the invention of the division switch of 1st Embodiment of this invention. 1 is a circuit diagram of a sectional switch according to a first embodiment of the present invention; FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic explanatory drawing of a structure of the division switch of 1st Embodiment of this invention. It is a figure explaining the structure of the high voltage power receiving equipment of a prior art. 1 is a schematic diagram illustrating features of a prior art segmented switch; FIG. 1 is a circuit diagram of a prior art sectional switch; FIG. It is a schematic explanatory drawing of the structure of the division switch of a prior art.

Hereinafter, the present invention will be described in more detail using preferred embodiments. However, the following embodiments are merely examples embodying the present invention, and the present invention is not limited thereto.

(First embodiment)
The feature of the present invention is the internal configuration of the sectioning switch, and the configuration of the high-voltage power receiving facility equipped with the sectioning switch is substantially the same as the prior art high-voltage power receiving facility 100 shown in FIG. , the configuration of the sectional switch will be mainly described. FIG. 1 is a conceptual diagram showing features of the sectional switch according to the first embodiment of the present invention, FIG. 2 is a circuit diagram of the sectional switch according to the first embodiment of the present invention, and FIG. 1 is an explanatory diagram of a configuration of a sectional switch according to a first embodiment of the present invention; FIG. In FIG. 1, a single phase is shown for convenience of explanation, but in reality it is a three-phase alternating current as shown in FIGS.

As shown in the figure, the sectional switch 1 of this embodiment mainly includes a zero-phase current transformer ZCT1, an overcurrent detector OCR1, a lightning arrester LA1, a control power transformer VT1, a current breaking device 15, and a trip mechanism. 16. The current interrupting device 15 is configured with a vacuum switch VSW. The vacuum switch VSW is a commercially available well-known one which is constructed by providing a movable contact and a fixed contact in a vacuum valve, and is arranged in place of the opening/closing switch SW of the conventional divisional switch 120 . The fixed electrode 18 is a load-side external electrode of the vacuum switch VSW and is connected to the load-side internal electrode 20 . The movable electrode 21 is an external electrode on the power supply side of the vacuum switch VSW and is connected to the internal electrode 22 on the power supply side. The load side internal electrode 20 is connected to the output high voltage cable 130 and the power supply side internal electrode 22 is connected to the input high voltage cable 200 .

The zero-phase current transformer ZCT1, the overcurrent detector OCR1, the lightning arrester LA1, and the control power transformer VT1 each have the same configuration as the above-described prior art zero-phase current transformer ZCT, overcurrent detector OCR, and lightning arrester LA. , may be the same as the control power transformer VT, but in the present invention, unlike the prior art, the overcurrent detector OCR1 is connected to the bushing 23 on the power supply side so as to detect overcurrent in the internal electrode 22 on the power supply side. A lightning arrester LA1 and a control power transformer VT1 are connected to an internal power supply electrode 22 between the vacuum switch VSW and the power supply side. The internal power supply electrode 22 is a portion that electrically connects the input high voltage cable 110 and the movable electrode 21 of the vacuum switch VSW, and is composed of a copper plate, cable, or the like.

Zero-phase current transformer ZCT1 detects an earth leakage current and transmits a detection signal to SOG control device 14 . The overcurrent detector OCR1 is mounted on the power supply side bushing 23 through which the power supply side internal electrode 22 is inserted, and outputs a detection signal detecting an overcurrent to the SOG control device 14 provided outside the sectional switch 1. can be sent. For example, when an interphase short circuit occurs on the power supply side (on the power supply side internal electrode 22 side) while the current interrupter 15 is open, the overcurrent detector OCR1 manages the overcurrent detection signal via the SOG controller 14. By sending it to the company, it is possible to respond immediately after the spillover accident.

The control power transformer VT1 receives a high voltage of 6600V supplied from the power company from an electrode (for example, power supply side internal electrode 22) between the vacuum switch VSW and the power supply side, and transforms it to 100V. It is supplied to the SOG controller 14 . The lightning arrestor LA1 releases a lightning surge to the ground through the ground line 210 when struck by lightning. The trip mechanism 16 opens and closes the vacuum switch VSW in response to a control signal from the SOG controller 14 .

It should be noted that the trip mechanism 16 requires appropriate modification of the trip mechanism 160 of the prior art. It is a mechanical design change (for example, a design change of a mechanism related to the connecting shaft 170) for connecting/disconnecting to an internal fixed contact), which is extremely easy for those skilled in the art. In addition, the vacuum switch VSW may be arranged with its direction changed from left to right, but the trip mechanism 16 is configured to operate the movable electrode 21 of the vacuum switch VSW in either direction.

A fixed electrode 18 of the vacuum switch VSW is connected to a load-side internal electrode 20 connected to an output high-voltage cable 130 on the load side. A movable electrode 21 of the vacuum switch VSW is connected to a power supply side internal electrode 22 connected to an input high voltage cable 200 on the power supply side. A zero-phase current transformer ZCT and an overcurrent detector OCR1 are attached adjacent to a bushing 23 covering the power supply side internal electrode 22 . A lightning arrestor LA1 is connected between the power supply side internal electrode 22 and the housing 19 of the sectional switch 1. As shown in FIG. The housing 19 of the sectional switch 1 is made of metal and grounded by a ground wire 210 . The power supply side internal electrode 22 and the load side internal electrode 20 in the sectional switch 1 are constructed using a copper plate, a cable, or the like.

The vacuum switch VSW is turned on, that is, in a state where the movable contact and the fixed contact inside the vacuum switch VSW are in contact, and even if an overcurrent occurs, the arc is extinguished and the switch is turned off. The movable contact and fixed contact can be opened. Therefore, in the present invention, the vacuum switch VSW is used as the current breaker 15. Even if an overcurrent occurs due to a short circuit, the operator has the ability to cut off the current, thereby reducing spillover accidents. When the vacuum switch VSW is on, the current interrupter 15 is also on, and when the vacuum switch VSW is off (opened), the current interrupter 15 is also off (opened).

The control power transformer VT1 receives a high voltage of 6600 V from the power supply side internal electrode 22, transforms it to a low voltage of 100 V, and supplies this 100 V to the SOG controller . With this configuration, even if the breaker 15 (vacuum switch VSW) is open, the control power transformer VT1 always supplies power to the SOG control device 14 while power is being supplied from the electric power company. be able to.

The SOG control device 14 is mounted outside the sectional switch 1 at a predetermined height on the No. 1 pillar P of the premises, similarly to the prior art shown in FIG. The leakage detection signal from the zero-phase current transformer ZCT1 and the overcurrent detection signal from the overcurrent detector OCR1 are sent to the SOG controller 14, and the SOG controller 14 immediately trips when it receives the leakage current or overcurrent detection signal. A control signal is sent to the mechanism 16 to activate the trip mechanism 16 and open the vacuum switch VSW. This trip mechanism 16, like the conventional trip mechanism 160, operates the trip coil TC and spring to operate the movable electrode 21 of the vacuum switch VSW to contact the fixed contact and the movable contact in the vacuum valve described above.・It controls opening.

The SOG control device 14 of the present invention differs from the conventional technology in that, as described above, even if the current interrupting device 15 (vacuum switch VSW) is open, during the period in which power is supplied from the electric power company, Since a voltage of 100 V is always supplied from the control power transformer VT, the SOG control device 14 can always maintain a standby state.

Therefore, for example, in FIG. 1, if the control power transformer VT1 is arranged on the load side of the vacuum switch VSW as in the prior art, when the vacuum switch VSW is turned on from the off state, If a short-circuit occurs on the load side, the high voltage of 6600 V is not supplied to the control power transformer VT, so the low voltage of 100 V is not supplied to the SOG controller 14, and the SOG controller 14 does not function. . Therefore, the short-circuit current cannot be detected and interrupted, resulting in a spillover accident.

However, as in the present invention, in the configuration in which the control power transformer VT1 is arranged closer to the power supply side than the vacuum switch VSW and is connected to the power supply side internal electrode 22, even if the vacuum switch VSW is off, A high voltage of 6600 V is always supplied to the control power transformer VT1, and a voltage of 100 V is also supplied to the SOG control device 14 to maintain the standby state. Even if a short circuit occurs on the load side, the short circuit current can be detected and the vacuum switch VSW can be opened, so that a spillover accident can be prevented.

The lightning arrester LA<b>1 has a power supply side terminal connected to the power supply side internal electrode 22 and a ground terminal connected to the housing 19 of the switch 1 . A housing 19 of the switch 1 is grounded by a ground wire 210 . With this configuration, even if, for example, a lightning surge flows into the switch 1 from the power company's transmission line, the lightning surge is transmitted from the power supply internal electrode 22 through the housing 19 of the switch 1 to the ground. It can escape and the switch 1 can be protected at all times. In the case of a configuration in which a lightning arrester is connected to the load side as in the prior art, when the current breaker 150 is open, the lightning surge from the transmission line cannot escape to the ground, and the switch 120 is damaged.・There is a risk of short-circuiting and causing a spillover accident. In addition, lightning arrester LA1 itself is a commercial item.

1 sectional switch 15 current breaking device 16 trip mechanism 17 connecting shaft 18 fixed electrode 19 housing 20 load side internal electrode 21 movable electrode 22 power supply side internal electrode 23 bushing 100 high voltage power receiving equipment 110 lead-in wire 120 sectional switch 130 output high voltage Cable 140 SOG control device 150 Current breaking device 160 Trip mechanism 170 Connecting shaft 180 Fixed electrode 190 Housing 200 Input high voltage cable 210 Ground wire 230 Bushing B Blade (movable electrode)
F Factory LA, LA1 Lightning Arrester OCR, OCR1 Overcurrent Detector P Pole No. 1 VT, VT1 Control Power Transformer ZCT, ZCT1 Zero Phase Current Transformer

Claims (1)

In a high-voltage power receiving facility equipped with a divisional switch , which is a demarcation point of responsibility and property, provided on the business side that receives high voltage (6600V) from the substation of the electric power company through the service line,
The sectional switch comprises at least a transformer for control power supply, a lightning arrester for releasing a lightning surge flowing in from the power supply side to the ground through a ground line , an overcurrent detector, and a power cutoff device,
The overcurrent detector is connected to the primary side power supply connection point side of the lead-in line , the current breaker is a vacuum switch having a movable contact and a fixed contact in the vacuum valve, and the control power transformer is , transforms the supplied high voltage (6600 V) to a low voltage (100 V or 200 V), and supplies a low voltage ( 100V) is provided with an SOG control device that maintains a standby state by constantly energizing the high voltage power receiving equipment.

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