JP7068729B1 - Ground terminal separated SPD and ground unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an SPD capable of reliably protecting an electric device distributed from a distribution board having both a molded case circuit breaker and an earth-leakage circuit breaker from a lightning surge inexpensively and easily.
SOLUTION: A ground terminal separation type SPD1 is connected to one of a power supply side connection terminal 11a, 11b, 11c, a ground terminal ED for a wiring breaker system, or a ground terminal _{E ELB} for an earth-leakage circuit breaker system. It is provided with a first grounding terminal 12 to be grounded, and a second grounding terminal 13 connected to the other of the grounding terminal _{ED for the wiring breaker system or the grounding terminal EELB for} the earth-leakage circuit breaker system. Between the power supply side connection terminals 11a, 11b, 11c and the first ground terminal 12, between the power supply side connection terminals 11a, 11b, 11c and the second ground terminal 13, and between the first ground terminal 12 and the second ground terminal. Lightning protection elements 21a, 21b, 21c, 22, 23 are provided between the grounding element 13 and the lightning protection elements 21a, 21b, 21c, 22 and 23.
[Selection diagram] Fig. 1

Description

The present invention relates to an SPD (Surge Protective Device) for protecting an electric device from a lightning surge or the like.

The SPD (Surge Protective Device) is a device for protecting an electric device from a lightning surge or the like, and a lightning protection element such as a zinc oxide element or a gas-filled discharge tube is provided inside the SPD (Surge Protective Device). The SPD is connected in parallel to the electrical equipment to be protected. When a lightning surge overvoltage invades the power line, the lightning protection element starts operating according to the overvoltage and causes a lightning surge current to flow to the ground. At this time, a voltage generated in the SPD is applied to the electric device, and by suppressing this voltage to be lower than the withstand voltage of the electric device, it is possible to prevent dielectric breakdown of the electric device.

When connecting the SPD in parallel to the electrical equipment, the grounding of the electrical equipment must be connected to the grounding of the SPD. If the grounding of the electrical equipment and the grounding of the SPD are not connected, in addition to the voltage generated in the SPD when a lightning surge occurs, the voltage generated by the impedance of the grounding wire of the SPD and the grounding resistance is applied to the electrical equipment. It ends up. This makes it difficult to protect electrical equipment against lightning surges. Therefore, in order to enhance the protection effect from lightning surges, it is important to connect the grounding of the electrical equipment to be protected and the grounding of the SPD.

The SPD is also arranged inside the distribution board. On the distribution board, a circuit breaker (breaker) for the main line, which is installed on the main line to which power is input from the outside, and a circuit breaker (breaker) for branching, which is connected below the circuit breaker for the main line, are arranged. Has been done. Power is distributed to various electrical devices in a building via circuit breakers for trunk lines and circuit breakers for branching. The ground wire of the electrical equipment is connected to the ground terminal of the distribution board.

For example, in the circuit configuration example of the distribution board shown in FIG. 8, each electric device 113a is passed through the wiring breakers 112a and 112b for branching from the trunk line 101 provided with the wiring breaker 102 for the main distribution board. , 113b, and the ground wire (indicated by a broken line) of each of the electric devices 113a and 113b is connected to the ground terminal 130 of the distribution board. In this configuration, the SPD 150 is installed between the trunk line 101 and the ground terminal 130. As a result, the electric devices 113a and 113b distributed via the distribution board can be collectively protected from lightning surges.

Non-Patent Document 1 shows a product example of an SPD for a distribution board.

Product Information SPD for distribution board, [online], Otowa Electric Co., Ltd., [Search on August 18, 2nd year of Reiwa], Internet <URL: https://www.otowadenki.co.jp/item/ Distribution board For spd />

By the way, the inventors of the present application have found that there are the following problems regarding the installation of the SPD inside the distribution board.

Depending on the type of distribution board, a leakage breaker may be built in as a branch breaker together with a molded case circuit breaker. The earth-leakage circuit breaker is used for systems that require protection such as ground faults, and if an earth leakage occurs due to a ground fault, etc., it has a function to detect and cut off the minute current change. There is.

Then, the grounding of the electric device connected to the molded case circuit breaker and the grounding of the electric device connected to the earth-leakage circuit breaker may be separated. That is, it is stated as a recommendation that the grounding wire and grounding electrode of equipment installed in the electric circuit protected by the earth-leakage circuit breaker and the unprotected electric circuit should not be shared except under specific conditions ( Extension regulations (JEAC80001-2016) 1350-13). Therefore, in a distribution board with both circuit breakers built-in, the ground terminal inside the distribution board is divided into a ground terminal for the circuit breaker system for wiring and a ground terminal for the earth-leakage circuit breaker system. There is.

Therefore, when the SPD is installed in the distribution board in which both the molded case circuit breaker and the earth-leakage circuit breaker are built-in, the following problems occur.

As described above, the SPD is connected in parallel with the electrical device to be protected. Then, it is important to connect the grounding of the electric device to be protected and the grounding of the SPD in the protection from a lightning surge or the like. However, in the distribution board in which both the molded case circuit breaker and the earth-leakage circuit breaker are built-in, the ground terminal is divided into two, so that the SPD cannot be effectively arranged. That is, if the grounding of the SPD is connected to the grounding terminal for the molded case circuit breaker system, the protective effect on the electrical equipment on the earth-leakage circuit breaker side is greatly reduced. On the contrary, if the ground of the SPD is connected to the ground terminal for the earth-leakage circuit breaker system, the protective effect on the electric device on the side of the molded case circuit breaker is greatly reduced.

One countermeasure against this problem is to arrange two SPDs, one on the molded case circuit breaker side and one on the earth-leakage circuit breaker side. As a result, a sufficient protective effect can be obtained for both the electric device on the molded case circuit breaker side and the electric device on the earth-leakage circuit breaker side. However, in this case, the cost required for the SPD increases, and the man-hours for installing the SPD in the distribution board increase. In addition, it is necessary to secure a space for arranging two SPDs in the distribution board.

In view of the above problems, the present invention makes it possible to inexpensively, easily, and reliably reduce the electric power distributed from a distribution board having both a molded case circuit breaker and an earth-leakage circuit breaker from a lightning surge. It provides an SPD that makes it possible to protect.

In one aspect of the present invention, the ground terminal separation type SPD (Surge Protective Device) includes one or a plurality of power supply side connection terminals connected to the power supply side wiring such as a trunk line, and a ground terminal for the wiring breaker system. Alternatively, the first ground terminal connected to one of the ground terminals for the leakage breaker system and the ground terminal for the wiring breaker system, or the second ground terminal connected to the other of the ground terminal for the leakage breaker system. A grounding terminal is provided, and between the power supply side connection terminal and the first grounding terminal, between the power supply side connection terminal and the second grounding terminal, and between the first grounding terminal and the second grounding terminal. A lightning protection element is provided between the two.

According to this aspect, the ground terminal separation type SPD has a power supply side connection terminal, a ground terminal for a wiring breaker system, or a first ground terminal connected to one of the ground terminals for an earth-leakage circuit breaker system. It is provided with a grounding terminal for the wiring breaker system or a second grounding terminal connected to the other of the grounding terminals for the earth-leakage circuit breaker system. That is, the ground terminal is divided into two. Since a lightning protection element is provided between the power supply side connection terminal and the first grounding terminal, the electrical equipment connected to either the molded case circuit breaker system or the earth-leakage circuit breaker system is protected by this lightning protection element. .. Further, since a lightning protection element is provided between the power supply side connection terminal and the second ground terminal, the electric device connected to the other of the wiring breaker system or the earth-leakage circuit breaker system is protected by this lightning protection element. Will be done. Further, since a lightning protection element is provided between the first grounding terminal and the second grounding terminal, the first grounding terminal and the second grounding terminal are electrically separated from each other in a normal state. Therefore, one ground terminal separation type SPD of this embodiment is installed, and the first ground terminal is connected to either the ground terminal for the wiring breaker system or the ground terminal for the earth-leakage circuit breaker system, and the second ground terminal is connected. By connecting the ground terminal to the ground terminal for the wiring breaker system or the ground terminal for the earth-leakage circuit breaker system, it is connected to the electrical equipment connected to the wiring breaker system and the earth-leakage circuit breaker system. Both electrical equipment can be protected from lightning surges. Therefore, the electric equipment distributed from the distribution board having both the molded case circuit breaker and the earth-leakage circuit breaker can be reliably protected from the lightning surge inexpensively and easily.

The grounded terminal separation type SPD of the above aspect is provided between the first lightning protection element provided between the power supply side connection terminal and the connection node, and between the connection node and the first grounding terminal. It may be provided with a second lightning protection element and a third lightning protection element provided between the connection node and the second ground terminal.

Thereby, the ground terminal separation type SPD of the above aspect can be realized by a simple configuration.

Further, the ground terminal separation type SPD of the above embodiment is a first lightning protection element provided between the power supply side connection terminal and the connection node, and a three-pole type gas-filled discharge tube, wherein the intermediate electrode is the above. It is connected to a connection node, and one of the first electrode and the second electrode is connected to the first ground terminal, and the other is provided with a gas-filled discharge tube connected to the second ground terminal. , May be.

Thereby, the ground terminal separation type SPD of the above aspect can be realized by a simple configuration.

Further, the ground terminal separation type SPD of the above aspect is provided between the first lightning protection element provided between the power supply side connection terminal and the connection node, and between the connection node and the first ground terminal. It may be provided with a second lightning protection element and a third lightning protection element provided between the first grounding terminal and the second grounding terminal.

Thereby, the ground terminal separation type SPD of the above aspect can be realized by a simple configuration.

Further, the ground terminal separation type SPD of the above embodiment is a first lightning protection element provided between the power supply side connection terminal and the connection node, and a three-pole type gas-filled discharge tube, wherein the intermediate electrode is the above. It is connected to the first ground terminal, and one of the first electrode and the second electrode is connected to the connection node, and the other is provided with a gas-filled discharge tube connected to the second ground terminal. , May be.

Thereby, the ground terminal separation type SPD of the above aspect can be realized by a simple configuration.

In another aspect of the present invention, an SPD (Surge Protective Device) including one or a plurality of power supply side connection terminals connected to a power supply side wiring such as a trunk line and a ground terminal is used to obtain a ground terminal separated type SPD. The grounding unit for configuration is connected to either the SPD side connection terminal connected to the grounding terminal of the SPD, the grounding terminal for the wiring breaker system, or the grounding terminal for the leakage breaker system. A first grounding terminal and a second grounding terminal connected to the other of the grounding terminal for the wiring breaker system or the grounding terminal for the leakage breaker system are provided, and the first grounding terminal and the second grounding are provided. A lightning protection element is provided between the terminal and the terminal.

According to this aspect, the grounding unit for forming the grounding terminal separated type SPD is a grounding terminal for the SPD side connection terminal connected to the grounding terminal of the SPD, a grounding terminal for the wiring breaker system, or a grounding terminal for the earth-leakage circuit breaker system. It is provided with a first grounding terminal connected to one of the grounding terminals of the above, and a grounding terminal for a wiring breaker system or a second grounding terminal connected to the other of the grounding terminals for an earth-leakage circuit breaker system. Since a lightning protection element is provided between the first ground terminal and the second ground terminal, the first ground terminal and the second ground terminal are electrically separated from each other in a normal state. Therefore, the SPD side connection terminal of the grounding unit of this embodiment is connected to the grounding terminal of the SPD connected to the power supply side wiring such as the trunk line, and the first grounding terminal is the grounding terminal for the wiring breaker system or the electric leakage. By connecting to one of the grounding terminals for the breaker system and connecting the second grounding terminal to the grounding terminal for the wiring breaker system or the other of the grounding terminals for the leakage breaker system, the wiring is cut off. Both the electrical equipment connected to the equipment system and the electrical equipment connected to the leakage breaker system can be protected from lightning surges. Therefore, the electric equipment distributed from the distribution board having both the molded case circuit breaker and the earth-leakage circuit breaker can be reliably protected from the lightning surge inexpensively and easily.

Further, the grounding unit of the above aspect is provided between the first lightning protection element provided between the SPD side connection terminal and the first grounding terminal, and between the SPD side connection terminal and the second grounding terminal. It may be provided with the second lightning protection element provided.

Thereby, the grounding unit of the above-described embodiment can be realized by a simple configuration.

Further, the grounding unit of the above embodiment is a three-pole type gas-filled discharge tube, the intermediate electrode is connected to the SPD side connection terminal, and one of the first electrode and the second electrode is the first electrode. It may be said that one is connected to the ground terminal and the other is provided with a gas-filled discharge tube connected to the second ground terminal.

Thereby, the grounding unit of the above-described embodiment can be realized by a simple configuration.

Further, the grounding unit of the above aspect is provided between the first lightning protection element provided between the SPD side connection terminal and the first grounding terminal, and between the first grounding terminal and the second grounding terminal. It may be provided with the second lightning protection element provided.

Thereby, the grounding unit of the above-described embodiment can be realized by a simple configuration.

Further, the grounding unit of the above embodiment is a three-pole gas-filled discharge tube, the intermediate electrode is connected to the first grounding terminal, and one of the first electrode and the second electrode is the SPD. It may be provided with a gas-filled discharge tube connected to the side connection terminal and the other connected to the second ground terminal.

Thereby, the grounding unit of the above-described embodiment can be realized by a simple configuration.

Further, the grounding unit of the above aspect includes a lightning protection element provided between the SPD side connection terminal and one of the first grounding terminal or the second grounding terminal, and the SPD side connection terminal and the above. It may be connected to the first grounding terminal or the other of the second grounding terminal without a lightning protection element.

Thereby, the grounding unit of the above-described embodiment can be realized by a simple configuration.

According to the present invention, it is possible to reliably and inexpensively protect an electric device distributed from a distribution board having both a molded case circuit breaker and an earth-leakage circuit breaker from a lightning surge.

Internal configuration example of ground terminal separated SPD according to the embodiment Usage example of the ground terminal separated SPD according to the embodiment Usage example of conventional SPD as a comparative example Usage example of conventional SPD as a comparative example Another internal configuration example of the ground terminal separated SPD according to the embodiment Another internal configuration example of the ground terminal separated SPD according to the embodiment Another internal configuration example of the ground terminal separated SPD according to the embodiment Circuit configuration example of a distribution board with a conventional SPD An example in which a grounding unit is used to realize a configuration equivalent to the grounding terminal separation type SPD in FIG. (A) to (c) are other configuration examples of the grounding unit. An example in which a grounding unit is used to realize a configuration equivalent to the grounding terminal separation type SPD in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment)
FIG. 1 is a circuit diagram showing an internal configuration example of a ground terminal separated type SPD (Surge Protective Device) according to an embodiment. The ground terminal separation type SPD1 shown in FIG. 1 is for three-phase. Further, FIG. 2 shows an example in which the ground terminal separation type SPD1 shown in FIG. 1 is used inside the distribution board.

In FIG. 2, the wirings 111 and 121 are branched from the trunk line 101. In FIG. 2, for convenience of illustration, the three-phase trunk line 101 is shown by a single solid line. The main line 101 is provided with a molded case circuit breaker 102 for the main distribution board. Further, as a circuit breaker for branching, a molded case circuit breaker 112 and an earth leakage circuit breaker 122 are provided. The electric device 113 is distributed from the wiring 111 via the molded case circuit breaker 112. The electric device 123 is distributed from the wiring 121 via the earth-leakage circuit breaker 122. The ground of the electric device 113 is connected to the ground terminal _ED for the circuit breaker system for wiring. The ground of the electric device 123 is connected to the ground terminal E _ELB for the earth-leakage circuit breaker system.

The ground terminal separation type SPD1 shown in FIG. 1 includes power supply side connection terminals 11a, 11b, 11c, a first ground terminal 12, and a second ground terminal 13. That is, the ground terminal is divided into two. In the example of FIG. 2, the power supply side connection terminals 11a, 11b, 11c are connected to the trunk line 101 provided with the molded case circuit breaker 102 for the main trunk of the distribution board. The first ground terminal 12 is connected to the ground terminal _ED for the molded case circuit breaker system. The second ground terminal 13 is connected to the ground terminal E _ELB for the earth-leakage circuit breaker system.

Zinc oxide elements 21a, 21b, 21c, which are examples of lightning protection elements, are provided between the power supply side connection terminals 11a, 11b, 11c and the connection node 14, respectively. A gas-filled discharge tube 22, which is an example of a lightning protection element, is provided between the connection node 14 and the first ground terminal 12. A gas-filled discharge tube 23, which is an example of a lightning protection element, is provided between the connection node 14 and the second ground terminal 13. That is, zinc oxide elements 21a, 21b, 21c and a gas-filled discharge tube 22 are provided as lightning protection elements between the power supply side connection terminals 11a, 11b, 11c and the first ground terminal 12. Zinc oxide elements 21a, 21b, 21c and a gas-filled discharge tube 23 are provided as lightning protection elements between the power supply side connection terminals 11a, 11b, 11c and the second ground terminal 13. Gas-filled discharge pipes 22 and 23 are provided between the first ground terminal 12 and the second ground terminal 13 as lightning protection elements.

3 and 4 are diagrams showing a conventional SPD usage example as a comparative example of the present embodiment. As explained in the section of the task, in the distribution board with both the molded case circuit breaker and the earth-leakage circuit breaker built-in, the ground terminal is divided into two, so when arranging the SPD of the conventional configuration, the SPD One unit cannot be placed effectively.

Therefore, in FIG. 3, SPD 151 is provided between the trunk line 101 and the ground terminal ED for the molded case circuit breaker system, and SPD 152 is provided between the trunk line 101 and the ground terminal _{E ELB} of the earth-leakage circuit breaker system. ing. As a result, a sufficient protective effect can be obtained for both the electric device 113 on the molded case circuit breaker 112 side and the electric device 123 on the earth-leakage circuit breaker 122 side. However, in this case, since two SPDs 151 and 152 are installed in the distribution board, the man-hours increase. Further, it is necessary to secure a space for arranging the two SPDs 151 and 152 in the distribution board. Further, the cost required for SPDs 151 and 152 increases, and when the trunk line 101 has three phases, both SPDs 151 and 152 need to be three-phase SPDs, and the cost simply doubles.

Further, in FIG. 4, _SPD153 is provided between the trunk line 101 and the ground terminal ED for the circuit breaker system for wiring, and the ground terminal ED for the circuit breaker system for wiring and the ground terminal _E for the circuit breaker system for wiring. An SPD 154 is provided between the _ELB and the ELB. In the normal state, the SPD is electrically substantially isolated. Therefore, even if the SPD 154 is provided, it can be considered that the ground terminal ED for the molded case circuit breaker system and the ground terminal _{E ELB} for the earth-leakage circuit breaker system are separated in the normal state. Further, since the SPD 154 connects the ground terminals to each other, for example, a relatively inexpensive SPD for one phase can be used.

However, focusing on the electrical device 123 on the earth-leakage circuit breaker 122 side in FIG. 4, two SPDs 153 and 154 connected in series are connected in parallel. Therefore, when a lightning surge occurs, the voltage generated in the two SPDs 153 and 154 is applied to the electric device 123. This reduces the protective effect of the electric device 123 as compared with the state in which one SPD 152 is connected in parallel as shown in FIG. Further, although SPD154 is relatively inexpensive, it still requires man-hours for installation and it is necessary to secure an installation space.

Compared to these comparative examples, when the ground terminal separation type SPD1 according to the present embodiment is used, both the electric device 113 on the molded case circuit breaker 112 side and the electric device 123 on the earth-leakage circuit breaker 122 side are used as one unit. SPD1 can be used to protect all at once.

That is, according to the present embodiment, the ground terminal separation type SPD 1 has the power supply side connection terminals 11a, 11b, _11c , the first ground terminal 12 connected to the ground terminal ED for the wiring breaker system, and the leakage cutoff. It is provided with a second grounding terminal 13 connected to the grounding terminal E _ELB for the instrument system. That is, the ground terminal is divided into two. Since the lightning protection elements 21a, 21b, 21c, 22 are provided between the power supply side connection terminals 11a, 11b, 11c and the first ground terminal 12, the electric device 113 connected to the molded case circuit breaker system is lightning. It is protected by protective elements 21a, 21b, 21c, 22. Further, since the lightning protection elements 21a, 21b, 21c, 23 are provided between the power supply side connection terminals 11a, 11b, 11c and the second ground terminal 13, the electric device 123 connected to the earth leakage breaker system can be used. It is protected by lightning protection elements 21a, 21b, 21c, 23. If the same protective element is used as the lightning protection elements 22 and 23, the molded case circuit breaker system and the earth-leakage circuit breaker system are protected at the same protection level. Further, since the lightning protection elements 22 and 23 are provided between the first ground terminal 12 and the second ground terminal 13, under normal conditions, the first ground terminal 12 and the second ground terminal 13 are electrically connected to each other. It is separated. Therefore, the first grounding terminal 12 is connected to the grounding terminal ED for the circuit breaker system for wiring, and the second grounding terminal 13 is connected to the grounding terminal _{E ELB} for the earth-leakage circuit breaker system to cut off the wiring. Both the electrical equipment 113 connected to the equipment system and the electrical equipment 123 connected to the earth-leakage circuit breaker system can be protected from lightning surges. Therefore, the electric devices 113 and 123 distributed from the distribution board having both the molded case circuit breaker 112 and the earth-leakage circuit breaker 122 can be reliably protected from lightning surges inexpensively and easily. ..

Further, in the present embodiment, the effect that the length of the connection wiring of the SPD can be shortened can be obtained. That is, when arranging the SPD, wiring for connecting to the system and wiring for grounding are required. When a lightning surge occurs, the voltage generated by the lightning surge flowing through these wirings is also applied to the electrical equipment. Therefore, in order to enhance the protection effect of the electrical equipment, it is preferable that the connection wiring of the SPD is as short as possible. However, in the configuration as shown in FIG. 4, for example, in addition to the voltage of the SPDs 153 and 154, the voltage generated in the connection wiring of the SPD 153 and the voltage generated in the connection wiring of the SPD 154 are further applied to the electric device 123. On the other hand, in the present embodiment, for the connection terminal separation type _SPD1 , the first ground terminal 12 is connected to the ground terminal ED for the circuit breaker system for wiring, and the second ground terminal 13 is the ground terminal for the earth-leakage circuit breaker system. Since it is only necessary to connect to the E _ELB , the influence of the wiring length can be suppressed.

(Other configuration examples)
The configuration of the ground terminal separation type SPD according to the present embodiment is not limited to the configuration shown in FIG. That is, the ground terminal is divided into two, between the power supply side connection terminal and the first ground terminal, between the power supply side connection terminal and the second ground terminal, and between the first ground terminal and the second ground terminal. Any configuration may be provided in which a lightning protection element is provided between the and.

The ground terminal separation type SPD2 shown in FIG. 5 includes a three-pole type gas-filled discharge tube 30. In the gas-filled discharge tube 30, the intermediate electrode is connected to the connection node 14. Then, one of the first electrode and the second electrode is connected to the first ground terminal 12, and the other is connected to the second ground terminal 13.

The ground terminal separation type SPD3 shown in FIG. 6 includes gas-filled discharge pipes 41 and 42. The gas-filled discharge tube 41 is provided between the connection node 14 and the first ground terminal 12. The gas-filled discharge tube 42 is provided between the first grounding terminal 12 and the second grounding terminal 13.

The ground terminal separation type SPD4 shown in FIG. 7 includes a three-pole type gas-filled discharge tube 50. The intermediate electrode of the gas-filled discharge tube 50 is connected to the first ground terminal 12. Then, one of the first electrode and the second electrode is connected to the connection node 14, and the other is connected to the second ground terminal 13.

The ground terminal separation type SPDs 2, 3 and 4 shown in FIGS. 5 to 7 can be used, for example, as shown in FIG. 2, in the same manner as the ground terminal separation type SPD1 shown in FIG. That is, by connecting the first ground terminal 12 to the ground terminal ED for the circuit breaker system and connecting the second ground terminal 13 to the ground terminal _{E ELB} for the earth-leakage circuit breaker system, the circuit breaker for wiring is connected. Both the electrical equipment 113 connected to the grid and the electrical equipment 123 connected to the earth-leakage circuit breaker system can be protected from lightning surges. Therefore, the electric devices 113 and 123 distributed from the distribution board having both the molded case circuit breaker 112 and the earth-leakage circuit breaker 122 can be reliably protected from lightning surges inexpensively and easily. ..

(Other embodiments)
The ground terminal separation type SPD according to the above-described embodiment can be realized as an integrated product. It is also possible to realize a ground terminal separated SPD having the same function by combining an existing SPD with another component.

FIG. 9 is an example in which the same configuration as that of the ground terminal separated type SPD1 of FIG. 1 is realized by combining two components. In FIG. 9, the SPD 1A includes power supply side connection terminals 11a, 11b, 11c and a ground terminal 15, and the ground unit 1B is connected to the _SPD side connection terminal 16 and the ground terminal ED for the wiring breaker system. The first grounding terminal 12 is provided, and the second grounding terminal 13 connected to the grounding terminal E _ELB for the leakage breaker system is provided. The SPD1A includes zinc oxide elements 21a, 21b, 21c provided between the power supply side connection terminals 11a, 11b, 11c and the ground terminal 15. The grounding unit 1B is a gas-filled discharge tube 22 provided between the SPD side connection terminal 16 and the first grounding terminal 12, and a gas-filled discharge tube 22 provided between the SPD side connection terminal 16 and the second grounding terminal 13. A discharge tube 23 is provided. By connecting the ground terminal 15 of the SPD 1A and the connection terminal 16 on the SPD side of the ground unit 1B, the same configuration as the ground terminal separated type SPD 1 of FIG. 1 can be realized.

10 (a), (b), and (c) are other configuration examples of the grounding unit. The grounding unit 2B shown in FIG. 10A includes a three-pole gas-filled discharge tube 30. In the gas-filled discharge tube 30, the intermediate electrode is connected to the SPD side connection terminal 16, one of the first electrode and the second electrode is connected to the first ground terminal 12, and the other is the second ground. It is connected to the terminal 13. By combining the grounding unit 2B shown in FIG. 10A with the SPD1A shown in FIG. 9 and connecting the SPD side connection terminal 16 to the grounding terminal 15, a configuration equivalent to that of the grounding terminal separated type SPD2 shown in FIG. 5 is realized. can do.

The grounding unit 3B shown in FIG. 10B includes gas-filled discharge pipes 41 and 42. The gas-filled discharge tube 41 is provided between the SPD side connection terminal 16 and the first grounding terminal 12, and the gas-filled discharge tube 42 is provided between the first grounding terminal 12 and the second grounding terminal 13. Has been done. By combining the grounding unit 3B shown in FIG. 10B with the SPD1A shown in FIG. 9 and connecting the SPD side connection terminal 16 to the grounding terminal 15, a configuration equivalent to that of the grounding terminal separated type SPD3 shown in FIG. 6 is realized. can do.

The grounding unit 4B shown in FIG. 10C includes a three-pole gas-filled discharge tube 50. In the gas-filled discharge tube 50, the intermediate electrode is connected to the first ground terminal 12, one of the first electrode and the second electrode is connected to the SPD side connection terminal 16, and the other is the second ground. It is connected to the terminal 13. By combining the grounding unit 4B shown in FIG. 10C with the SPD1A shown in FIG. 9 and connecting the SPD side connection terminal 16 to the grounding terminal 15, a configuration equivalent to that of the grounding terminal separated type SPD4 shown in FIG. 7 is realized. can do.

FIG. 11 is another configuration example in which the same configuration as that of the ground terminal separation type SPD3 of FIG. 6 is realized by combining two components. In FIG. 11, SPD3C and the grounding unit 3D are used. The SPD3C includes power supply side connection terminals 11a, 11b, 11c and a ground terminal 15, and contains zinc oxide elements 21a, 21b, 21c and gas between the power supply side connection terminals 11a, 11b, 11c and the ground terminal 15. A discharge tube 41 is provided. The grounding unit 3D is connected to the SPD side connection terminal 16, the first grounding terminal 12 connected to the grounding terminal ED for the wiring breaker system, and the second grounding terminal _{E ELB} connected to the earth-leakage circuit breaker system. It is provided with a ground terminal 13. A gas-filled discharge tube 42 is provided between the SPD side connection terminal 16 and one of the first ground terminal 12 or the second ground terminal 13 (second ground terminal 13 in FIG. 11), and the SPD side connection terminal 16 is provided. And the other of the first grounding terminal 12 or the second grounding terminal 13 (the first grounding terminal 12 in FIG. 11) are connected to each other without a lightning protection element. By connecting the ground terminal 15 of the SPD 3C and the connection terminal 16 on the SPD side of the ground unit 3D, the same configuration as the ground terminal separation SPD 3 of FIG. 6 can be realized.

The SPD1A shown in FIG. 9 and the SPD3C shown in FIG. 11 have already been used as products. By combining these with the grounding unit shown in the present embodiment, it is possible to realize a configuration equivalent to the grounding terminal separation type SPD according to the above-described embodiment. The grounding unit for realizing the grounding terminal separation type SPD is connected to the first grounding terminal 12 connected to the grounding terminal _{ED for the circuit breaker system for wiring and the grounding terminal EELB for} the earth-leakage circuit breaker system. A second ground terminal 13 and an SPD side connection terminal 16 connected to another SPD are provided. A lightning protection element is provided between the first grounding terminal 12 and the second grounding terminal 13.

In the above-described embodiment, the first grounding terminal 12 is connected to the grounding terminal _{ED for the earth-leakage circuit breaker system, and the second grounding terminal 13 is connected to the grounding terminal EELB for} the earth-leakage circuit breaker system. As described above, instead of this, the first ground terminal 12 is connected to the ground terminal _{E ELB} for the earth-leakage circuit breaker system, and the second ground terminal 13 is connected to the ground terminal ED for the earth-leakage circuit breaker system. It doesn't matter.

In the above-described embodiment, the ground terminal separation type SPD has been described as being for three-phase, but the present invention is not limited to this, and for example, a combination for single pole may be used. In the case of a single-phase two-wire system, the ground terminal separation type SPD has two power supply side connection terminals. Further, in the above-described embodiment, the zinc oxide element and the gas-filled discharge tube are exemplified as the lightning protection element, but the lightning protection element included in the ground terminal separation type SPD is not limited to these.

INDUSTRIAL APPLICABILITY The present invention is useful for easily and inexpensively protecting electrical equipment distributed via a distribution board containing both a molded case circuit breaker and an earth-leakage circuit breaker from lightning surges.

1,2,3,4 Ground terminal separated SPD
1A, 3C SPD
1B, 2B, 3B, 3D, 4B Grounding unit 11a, 11b, 11c Power supply side connection terminal 12 First grounding terminal 13 Second grounding terminal 14 Connection node 16 SPD side connection terminal 21a, 21b, 21c Zinc oxide element (first lightning) Protective element)
22 Gas-filled discharge tube (second lightning protection element)
23 Gas-filled discharge tube (third lightning protection element)
30 3-pole gas-filled discharge tube (lightning protection element)
41 Gas-filled discharge tube (second lightning protection element)
42 Gas-filled discharge tube (third lightning protection element)
50 3-pole gas-filled discharge tube (lightning protection element)
101 Ground terminal for trunk line ED wiring breaker system _{E ELB} Ground terminal for earth-leakage circuit breaker system

Claims (11)

It is a grounded terminal separated SPD (Surge Protective Device).
One or more power supply side connection terminals connected to the power supply side wiring such as the trunk line,
The grounding terminal for the molded case circuit breaker system or the first grounding terminal connected to one of the grounding terminals for the earth-leakage circuit breaker system,
It is provided with a grounding terminal for the molded case circuit breaker system or a second grounding terminal connected to the other of the grounding terminals for the earth-leakage circuit breaker system.
Lightning protection between the power supply side connection terminal and the first ground terminal, between the power supply side connection terminal and the second ground terminal, and between the first ground terminal and the second ground terminal. A ground terminal separation type SPD characterized by being provided with an element. In the ground terminal separated type SPD according to claim 1,
The first lightning protection element provided between the power supply side connection terminal and the connection node,
A second lightning protection element provided between the connection node and the first ground terminal,
A ground terminal separation type SPD including a third lightning protection element provided between the connection node and the second ground terminal. In the ground terminal separated type SPD according to claim 1,
The first lightning protection element provided between the power supply side connection terminal and the connection node,
A 3-pole type gas-filled discharge tube in which an intermediate electrode is connected to the connection node, one of the first electrode and the second electrode is connected to the first ground terminal, and the other is connected to the first ground terminal. A grounded terminal separated type SPD including a gas-filled discharge tube connected to the second grounded terminal. In the ground terminal separated type SPD according to claim 1,
The first lightning protection element provided between the power supply side connection terminal and the connection node,
A second lightning protection element provided between the connection node and the first ground terminal,
A ground terminal separation type SPD including a third lightning protection element provided between the first ground terminal and the second ground terminal. In the ground terminal separated type SPD according to claim 1,
The first lightning protection element provided between the power supply side connection terminal and the connection node,
A 3-pole type gas-filled discharge tube in which an intermediate electrode is connected to the first ground terminal, one of the first electrode and the second electrode is connected to the connection node, and the other is connected to the connection node. A grounded terminal separated type SPD including a gas-filled discharge tube connected to the second grounded terminal. A grounding unit for configuring a grounded terminal separated SPD using an SPD (Surge Protective Device) equipped with one or more power supply side connection terminals connected to power supply side wiring such as a trunk line and a grounding terminal. hand,
The SPD side connection terminal connected to the ground terminal of the SPD,
The grounding terminal for the molded case circuit breaker system or the first grounding terminal connected to one of the grounding terminals for the earth-leakage circuit breaker system,
It is provided with a grounding terminal for the molded case circuit breaker system or a second grounding terminal connected to the other of the grounding terminals for the earth-leakage circuit breaker system.
A grounding unit characterized in that a lightning protection element is provided between the first grounding terminal and the second grounding terminal. In the grounding unit according to claim 6,
A first lightning protection element provided between the SPD side connection terminal and the first grounding terminal,
A grounding unit including a second lightning protection element provided between the SPD side connection terminal and the second grounding terminal. In the grounding unit according to claim 6,
A 3-pole type gas-filled discharge tube in which an intermediate electrode is connected to the SPD side connection terminal, and one of the first electrode and the second electrode is connected to the first ground terminal. A grounding unit characterized in that the other is provided with a gas-filled discharge tube connected to the second grounding terminal. In the grounding unit according to claim 6,
A first lightning protection element provided between the SPD side connection terminal and the first grounding terminal,
A grounding unit including a second lightning protection element provided between the first grounding terminal and the second grounding terminal. In the grounding unit according to claim 6,
A 3-pole type gas-filled discharge tube in which an intermediate electrode is connected to the first ground terminal, and one of the first electrode and the second electrode is connected to the SPD side connection terminal. A grounding unit characterized in that the other is provided with a gas-filled discharge tube connected to the second grounding terminal. In the grounding unit according to claim 6,
A lightning protection element provided between the SPD side connection terminal and one of the first grounding terminal or the second grounding terminal is provided.
A grounding unit characterized in that the SPD side connection terminal and the other of the first grounding terminal or the second grounding terminal are connected without a lightning protection element.

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