JP2002252922A - Lightning arrester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prolong service life of a lightning arrester by effectively utilizing parts when being employed at 100 V in single-phase two wires. SOLUTION: A lightning arrester 1 is provided with a lightning tube 6 connected to a grounding terminal 5, varistors 7-9 connected between power supply terminals 2-4 and the lightning tube 6, varistors 10-12 connected between respective phases, fuses 13 and 14 connected between power supply terminals 2 and 4 of an L1- and L2-phases and varistors 7 and 9, light-emitting diodes 15 and 16 connected between output ends and N phases, a coil 17 of a relay connected between the output end of the fuse 13 in the L1-phase and N phase, a b contact 18 and a switch 19 of the relay connected in series between input ends of the fuses 13 and 14, a power supply line connected with L1- and L2-phase power supply terminals 2 and 4 when being employed at 100 V in single-phase two wires. Even if the varistor 10 is broken by lightning surge, the b contact 18 is turned on, and current is conducted is switched between the L2-N phases to be usable again, as an arresters.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightning arrester which is used for a single-phase three-wire or single-phase two-wire circuit and protects electrical equipment by absorbing a lightning surge.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
Power supply terminals 32, 33, and 34 to which power supply wires (not shown) of each phase of the single-phase three-wire circuit are connected, and a ground wire (not shown).
, A arrester 36 connected to the ground terminal 35, varistors 37, 38, 39 connected between the power terminals 32, 33, 34 of each phase and the arrester 36.
Varistors 40, 41, 42 connected between the phases;
And L2 phase power terminals 32 and 34 and varistors 37 and 39
Fuses 43 and 44 connected between
3 and 44 and display devices 45 and 46 such as light emitting diodes connected between the N phases. Lightning arrester 31
The varistors 37 to 42 absorb the lightning surge superimposed between the power supply lines or between the power supply line and the ground, and
6 discharges and protects the electrical equipment connected to the power supply from lightning surge. When the varistors 40 to 42 are destroyed by a lightning surge exceeding the varistor capacity, the fuse 4
3, 44 melts. The display devices 45 and 46 are turned off by the blowing of the fuses 43 and 44, and the failure of the lightning arrester 31 is displayed.

[0003]

The conventional lightning arrester 31 is:
When using a single-phase two-wire 100V, for example, the power supply
When used by connecting to the 1-phase and N-phase power terminals 32 and 33, the L2 phase is not used at all. For this reason, when only the varistor 40 connected to the L1 phase is destroyed, the varistors 39 and 41 connected to the L2 phase can be used, and the power line connected to the power terminal 32 of the L1 phase is connected to the power supply of the L2 phase. The terminal was used after being reconnected to the terminal. In addition, the lightning arrester 31 has been replaced without reconnecting the power line to the L2 phase.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the conventional lightning arrester, an object of the present invention is to extend the life of equipment by effectively using components when using a single-phase two-wire 100V. The present invention provides a lightning arrester capable of connecting at least a power supply terminal of each phase of a single-phase three-wire circuit, a ground terminal to which a ground wire is connected, and a lightning arrester connected to a ground terminal. A varistor connected between the power supply terminal of each phase and the arrester, a varistor connected between each phase,
And a display device connected between the output terminal of the fuse and the N-phase and used for a single-phase three-wire or a single-phase two-wire. L1 phase or L2 phase fuse output terminal and N
That is, the coil of the relay is connected between the phases, and the contact b of the relay and the switch are connected in series between the input terminals of the fuse.

[0005] Further, a slide lid is provided to cover the upper or side surface of the power supply terminal of the phase to which the relay is not connected so as to be openable and closable, and the slide lid and the switch are interlocked. When the lid is closed, the switch is turned on.

[0006]

According to the lightning arrester according to the first aspect of the present invention, at least a power terminal to which a power line of each phase of a single-phase three-wire circuit is connected, a ground terminal to which a ground line is connected, and a ground. A lightning arrester connected to the terminal, a varistor connected between the power supply terminal of each phase and the lightning arrester, a varistor connected between each phase, and a fuse connected between the power supply terminals of the L1 and L2 phases and the varistor And a display device connected between the output terminal of the fuse and the N-phase. A lightning arrester used for a single-phase three-wire or a single-phase two-wire, wherein a relay is provided between the output terminal of the L1-phase or L2-phase fuse and the N-phase. By extending the life of the lightning arrester by effectively using the parts when using the single-phase two-wire 100V by connecting the coil and the relay's contact b and the switch in series between the input terminals of the fuse. Can be.

According to the lightning arrester of the present invention, a slide lid is provided for covering the upper surface or the side surface of the power supply terminal of the phase to which the relay is not connected so as to be openable and closable. By turning off the switch when open and turning on the switch when the slide lid is closed, when using at 200 V single-phase three-wire or single-phase two-wire,
A short circuit between the 1-L2 phases can be reliably prevented.

[0008]

1 shows an embodiment of the structure of an arrester according to the present invention.
This will be described with reference to the accompanying drawings.

A lightning arrester 1 includes power terminals 2, 3, and 4 to which power lines (not shown) of each phase of a single-phase three-wire circuit are connected, and a ground terminal to which a ground line (not shown) is connected. 5, a lightning arrester 6 connected to the ground terminal 5, and power supply terminals 2, 3,
Varistors 7, 8, 9 connected between the arrester 4 and the arrester 6
And varistors 10, 11, and 12 connected between the phases,
Fuses 13 and 14 connected between the power terminals 2 and 4 of the L1 and L2 phases and the varistors 7 and 9;
14, display devices 15 and 16 such as light emitting diodes connected between the N-phase, an output terminal of the L1 phase fuse 13 and a coil 17 of a relay connected between the N-phase and an input terminal of the fuses 13 and 14. It is composed of a relay b contact 18 and a switch 19 connected in series between them.

An L2-phase power supply terminal 4 has a case 21 provided with a slide lid 20 for covering the upper surface of the terminal so as to be openable and closable.
The power supply line cannot be connected unless the slide lid 20 is open. Further, the slide lid 20 is linked with the switch 19, the switch 19 is turned off when the slide lid 20 is opened, and the switch 19 is turned off when the slide lid 20 is closed.
Is turned on.

When the lightning arrester 1 is used with a single-phase two-wire power supply of 100 V, a power supply line is connected to the L1 and N-phase power supply terminals 2 and 3, and a ground line is connected to the ground terminal 5. The display device 15 is turned on by the energization of the L1-N phase, the coil 17 of the relay is excited, and the b contact 18 of the relay is turned off. Display device 1
6 is not lit because it is not energized. At this time, the slide lid 20 is closed and the switch 19 is turned on.

The lightning surge superimposed between the power supply lines or between the power supply line and the ground is absorbed by the varistors 7, 8, and 10 and discharged by the arrester 6. This protects the electrical equipment connected to the power supply from lightning surge.

When the lightning surge exceeds the capacity of the varistor and the varistor 10 is destroyed, the fuse 13 is blown. When the fuse 13 is blown, the coil 17 of the relay is not excited, and the contact b is turned on. Further, the display device 15 is turned off, and a failure of the varistor 10 is displayed. At this time, if the slide lid 20 is opened and the switch 19 is turned off, the slide lid 20 is closed and the switch 19 is turned on.

When the b-contact 18 of the relay is turned on, the switch 19 is turned on, so that the current is switched to the L2-N phase without changing the connection of the power supply line. The display device 16 is turned on by energization, indicating that the lightning arrester 1 can be used.

The arrester 1 can be used until the varistor 11 is destroyed by the lightning surge and the fuse 14 is blown. When the fuse 14 is blown, the display device 16 is turned off, indicating that the lightning arrester 1 has been replaced.

When the lightning arrester 1 is used with a single-phase three-wire connection, a power supply line is connected to the power supply terminals 2, 3, and 4, and a ground wire is connected to the ground terminal 5. In the case of using a single-phase two-wire 200V power supply, a power supply line is connected to the power supply terminals 2 and 4, and a ground wire is connected to the ground terminal 5. At this time, in order to connect the power supply line to the power supply terminal 4, the slide lid 20 must be opened. When the slide lid 20 is opened, the switch 19 is opened.
Is turned off, so that the user does not short-circuit the L1 and L2 phases by mistake and can be used safely.

In this embodiment, a relay coil 17 is connected between the output terminal of the L1 phase fuse 13 and the N phase.
A slide lid 20 is provided at the power terminal 4 of the L2 phase and linked with the switch 19, but a coil 17 of the relay is connected between the output terminal of the fuse 14 of the L2 phase and the N phase, and the slide lid is connected to the power terminal 2 of the L1 phase. 20 may be provided. In this case, a power supply line is connected to the L2-phase power supply terminal 4 for use with a single-phase two-wire power supply of 100 V. The shape of the slide lid 20 is not limited.

Although the display device uses a light emitting diode, there is no limitation such as using a pilot lamp.

[0019]

As described above, the lightning arrester according to the present invention provides a lightning arrester that can effectively use parts and extend the life of equipment when used at 100 V of single-phase two-wire. The structure includes at least a power terminal to which a power line of each phase of a single-phase three-wire circuit is connected, a ground terminal to which a ground wire is connected, a lightning arrester connected to the ground terminal, and a power terminal of each phase. A varistor connected between the lightning arresters, a varistor connected between the phases, a fuse connected between the L1 and L2 phase power terminals and the varistor, and a display device connected between the output terminal of the fuse and the N phase. A lightning arrester used for a single-phase three-wire or single-phase two-wire, a relay coil is connected between the output terminal of the L1-phase or L2-phase fuse and the N-phase, and the relay b is connected between the input terminals of the fuse. Contact and switch connected in series More, there is an excellent effect that it is possible to extend the effective use to arrester life components when used in single-phase two-wire.

Further, a slide lid is provided for covering the upper or side surface of the power supply terminal of the phase to which the relay is not connected so as to be openable and closable. The slide lid and the switch are interlocked, and when the slide lid is opened, the switch is turned off. When the lid is closed, by turning on the switch, two-phase single-phase three-wire or single-phase two-wire
When used at 00 V, there is an excellent effect that a short circuit between the L1 and L2 phases can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a lightning arrester according to the present invention.

FIG. 2 is a circuit diagram of a conventional lightning arrester.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lightning arrester 2-4 ... Power supply terminal 5 ... Grounding terminal 6 ... Lightning arrester 7-12 ... Varistor 13, 14 ... Fuse 15, 16 ... Display device 17 ... Relay coil 18 ... Relay b contact 19 ... Switch 20 ... Slide Lid 21 ... Case

Claims (2)

[Claims] 1. A power supply terminal to which at least a power supply line of each phase of a single-phase three-wire circuit is connected, a ground terminal to which an earth wire is connected, a lightning arrester connected to the ground terminal, A varistor connected between the power supply terminal and the arrester, a varistor connected between the phases, a fuse connected between the power supply terminals of the L1 and L2 phases and the varistor, and an output terminal of the fuse. A lightning arrester configured with a display device connected between N phases and used for a single-phase three-wire or a single-phase two-wire, wherein a relay coil is connected between the output terminal of the L1-phase or L2-phase fuse and the N-phase; A lightning arrester characterized in that a contact "b" of the relay and a switch are connected in series between input terminals of the fuse. 2. A slide lid for covering an upper surface or a side surface of the power supply terminal of the phase to which the relay is not connected so as to be openable and closable, interlocking the slide lid and the switch, wherein the slide lid is opened when the slide lid is opened. The lightning arrester according to claim 1, wherein a switch is turned off and the switch is turned on when the slide lid is closed.