JPS5852542Y2 - Earth leakage breaker confirmation device for portable generators - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an earth leakage breaker confirmation device for a portable generator.

In the test using the test switch (4a in the figure) installed in the conventional earth leakage breaker, it was only the Chesif inside the earth leakage breaker, and since the generator is used on a mobile basis, the contact of the neutral point grounding circuit may be forgotten. It was not possible to confirm whether the earth leakage circuit breaker would operate reliably even if a current leakage occurred due to reasons such as ground leakage or poor grounding. It is an object of the present invention to provide an earth leakage breaker confirmation device that can also display whether or not the confirmation work has been performed.

An embodiment of the present invention will be described below with reference to the drawings. 1 is a portable three-phase alternating current generator, 2 is a neutral point grounding circuit grounded from its neutral point O, which includes a zero-phase current transformer 4b, a resistor It is grounded via the ground electrode 3 through the ground electrode 3.

Reference numeral 4 denotes an earth leakage interrupting device, which has a structure in which a zero-phase current transformer 4b detects the occurrence of earth leakage, and the main circuit is interrupted by an earth leakage relay.

20 is a test grounding circuit for testing the present invention, which is branched from the output circuit and connected to a test switch 5. resistance 6
', and is grounded via the terminal 1 and the grounding rod 8.

11 is a switch that interlocks with the test switch 5, 12 is a trip contact for disconnecting the main circuit breaker 4, and 13 is an auxiliary relay coil, which are connected in series to form a confirmation circuit.

14.16 is the auxiliary relay 130A contact, 15 is the B contact, 17 is a red indicator light, and 18 is a green indicator light. When both the test switch 5, that is, the switch 11 and the trip contact 12 are ON, A display circuit is constructed in which the relay coil 13 is activated, the A contacts 14 and 16 are closed, and the green indicator light 18 is lit.

At this time, the relay coil 13 is self-held by the A contact 14.

9 is a storage battery, 10 is a power switch, and 19 is an output terminal.

Since the present invention is constructed as described above, if the test switch 5 is operated to perform an earth leakage test before starting work, the contact 16 will close and the green indicator light 18 will light up to indicate that the test has been completed. do.

In addition, if the main circuit breaker of the earth leakage interrupter 4 does not shut off due to a failure even if the test confirmation is not performed or the test confirmation is performed, the contact 14
, 16, the open contact 15 closes and the red indicator light 17 lights up, indicating that the test has not been completed.

Therefore, the present invention can completely check everything such as testing the function of the earth leakage breaker and forgetting to ground, as well as confirming whether the test was performed prior to power generation, and can be used while moving around the construction site. This is particularly effective in terms of safety for portable generators.

[Brief explanation of drawings]

The figure is a circuit diagram showing an embodiment of the present invention. 1 is a three-phase alternating current generator, 2 is a neutral point grounding circuit, 3 is a grounding electrode, 4 is an earth leakage interrupter, 4a is a test switch, 4b is a zero-phase current transformer, 5 is a test switch, 6.6' is resistance,
7 is a terminal, 8 is a grounding rod, 9 is a storage battery, 10 is a power switch, 11 is a switch, 12 is a trip contact, 13 is an auxiliary relay coil, 14 is an auxiliary relay A contact, 15 is an auxiliary relay B contact, 16 is an auxiliary Relay A contact, 17 is indicator light (
18 is an indicator light (green), 19 is an output terminal, and 20 is a test grounding circuit.

Claims (1)

[Scope of utility model registration request] A test grounding circuit in which a test switch and a resistor are grounded in series to test for earth leakage on the load side of the main circuit breaker, a switch that interlocks with the test switch, a main circuit breaker trip contact, and an auxiliary relay coil. It may consist of a confirmation circuit configured in series, and a display circuit that indicates that the test has been completed when both the switch and the main circuit cutoff trip contact are ON, and indicates that the test has not been completed when either or both are OFF. Earth leakage breaker confirmation device for portable generators.