Neutral grounding transformer, method therefor, and device for preventing electric shock in case of submersion by using same

Abstract

The present invention provides a neutral grounding transformer, which uses a neutral grounding method from a single-phase two-wire low-voltage power distribution method, a method therefor, and a device for preventing an electric shock in the case of submersion to prevent a breaking operation of an earth-leakage circuit breaker by allowing exposed terminals of an electrical device to be submerged nearly at the same time while using the neutral grounding transformer and the method therefor. To this end, the device for preventing an electric shock in the case of submersion, according to one embodiment of the present invention, can comprise: a transformer for supplying a voltage by using the neutral grounding method in the single-phase two-wire low-voltage power distribution method; an earth-leakage circuit breaker connected to power outputted from the transformer; and a breaking operation prevention unit for preventing a breaking operation of the earth-leakage circuit breaker by allowing an exposed plus terminal and an exposed minus terminal connected to the earth-leakage circuit breaker to be submerged within a preset time difference.

Description

technical field [0001] Several embodiments of the present invention disclose the neutral point grounding transformer and its method and the submerged water electric shock prevention device using it. The neutral point grounding type transformer and method thereof, which can greatly reduce the leakage current leaking from its terminal to the outside when the exposed terminal of the electrical device is submerged and prevent electric shock from the source, and use the above neutral point grounding type transformer and its method. The method and the submerged anti-shock device allow the exposed terminals of the electrical device to sink into the water almost simultaneously to prevent the breaking operation of the leakage circuit breaker and allow the submerged electrical device to operate normally. [0002] In several embodiments of the present invention described later, the electrical device includes all electrical equipment and electrical equipment such as street lamps, motors, ...

AI Technical Summary

Problems solved by technology

In order to prevent users from making mistakes, it is a good method to mark the polarity of the plug terminals and socket terminals, but some users may not notice this and insert the plug directly into the socket or cause mistakes due to carelessness, so this method not perfect

[0022] Moreover, although the second prior art claims that the same effect can be obtained even if the metal plate for leakage prevention is connected to the "earth terminal (E)", it is known from the experimental results that the metal plate for leakage prevention is not connected to the "neutral terminal (E)". If it is connected to the ground terminal (E) but not to the "point terminal (N)", the required leakage and electric shock prevention effects cannot be obtained.

[0023] The second problem is that the conductive metal plate for preventing electric leakage disclosed in the second prior art cannot prevent electric leakage and electric shock when submerged in water as shown in the second prior art.

The second prior art discloses that the size of the anti-leakage flat conductor plate is 50x30cm when the use voltage is 380V, but according to the test results, although the earth leakage circuit breaker can be dropped when using a conductor plate of a larger size (such as 60x60cm) The time was further extended, but the result was that the earth leakage circuit breaker was operated

In fact, it is impossible to increase the size of the conductor plate infinitely because the space available for conductor plate installation is also limited

Therefore, the method of increasing the size of the flat conductor plate cannot fundamentally solve this problem

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