JPH0334824Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a safety breaker device used for power supply from outdoors to indoors, etc., and is particularly designed to prevent reverse current flow from indoors to outdoors. related to what was done.

[Prior Art] As is well known, in order to supply power from high-voltage distribution lines installed outdoors to general households, a second
The wiring means shown in the figure is used. That is, power sent from the substation to the high voltage distribution line 11 is guided to the indoor safety breaker 14 via the pole transformer 12 and the low voltage distribution line 13. The power led to the safety breaker 14 is then transmitted via an indoor power distribution line 15 to a plurality of (three in the illustrated case) outlets 16, which are power supply units.
-18 respectively.

In this case, as the safety breaker 14, what is called a so-called earth leakage breaker, which is equipped with a circuit breaker 19, a zero-phase current transformer 20, and an earth leakage detector 21 as shown in the figure, is widely used these days. . In this type of safety breaker 14, the earth leakage detector 21 detects the earth leakage current flowing through the zero-phase current transformer 20, and the circuit breaker 1
9 is controlled to be in an off state.

On the other hand, in recent years, it has become popular to install a simple engine generator 22 in each household in preparation for power outages and the like. This engine generator 22 is configured to be able to supply power to other outlets 16 and 17 via the indoor power distribution line 15 by connecting its plug 23 to any outlet 18 and driving it.

[Problems to be solved by the invention] By the way, when the engine generator 22 is used, the electric power sent from the engine generator 22 is transmitted to the indoor distribution line 15, the safety breaker 14, the low voltage distribution line 13, and the pole. In order to prevent the high-voltage distribution line 11 from being reversely energized via the upper transformer 12, it is necessary to keep the circuit breaker 19 of the safety breaker 14 in an open state, that is, in a cut-off state.

However, during a power outage when the engine generator 22 is actually used, it is often forgotten to open the circuit breaker 19, and the above-mentioned reverse energization causes work that touches the high-voltage distribution line 11. There are many accidents where people receive electric shock.

This idea was made in consideration of the above circumstances,
It is an object of the present invention to provide a very good safety breaker device with backflow prevention that can detect a reverse energization state and automatically turn off the power, and has a simple configuration and can be easily implemented.

[Means and actions for solving the problem] That is, the safety breaker device with backflow prevention according to this invention guides the power source power to the power source power supply section through the circuit breaker and the zero-phase current transformer in series, and The target is a safety breaker device equipped with an earth leakage detector that detects earth leakage current flowing through a phase current transformer and turns off the circuit breaker. The device is equipped with a reverse current detector that detects a reverse energization state from the zero-phase current transformer side to the breaker side and causes current to flow through the zero-phase current transformer. By configuring the circuit breaker to be turned off by driving the earth leakage detector with the current flowing through the current, it is possible to automatically turn off the power in the event of reverse energization, and the configuration is simple and easy to implement. It was designed to be obtained.

[Embodiment of the invention] Hereinafter, an embodiment of the invention will be described in detail with reference to the drawings. In FIG. 1, the same parts as in FIG. 2 are indicated by the same symbols, and only the different parts will be explained here.

That is, a backflow detector 25 is connected between the circuit breaker 19 and the zero-phase current transformer 20 via a winding 24 . This reverse current detector 25 detects a reverse current state from the zero-phase current transformer 20 side to the circuit breaker 19 side, and when reverse current is detected, the zero-phase current transformer 20 is connected to the arrow shown in the figure. As shown, current flows through it.

For this reason, the earth leakage detector 21 is
5 to the zero-phase current transformer 20 and controls the circuit breaker 19 to be in an OFF state, thereby preventing reverse energization.

Therefore, according to the configuration of the above embodiment, first, the reverse energization state is detected and the circuit breaker 19 is automatically controlled to the OFF state. This can reliably prevent accidents such as electrical shocks caused to workers who are carrying out construction work by touching them.

In addition, the reverse current detector 25 only causes current to flow through the zero-phase current transformer 20 when a reverse energization state is detected, and the existing earth leakage detector 21 controls the circuit breaker 19 to the OFF state. Therefore, the structure is organic and simple, and it can be easily applied and implemented in a conventional safety breaker.

Note that this invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without departing from the gist thereof.

[Effects of the invention] Therefore, as detailed above, according to this invention, it is possible to detect a reverse energization state and automatically turn off the power, and the configuration is simple and easy to implement. A safety breaker device with backflow prevention can be provided.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a safety breaker device with backflow prevention according to the present invention, and FIG. 2 is a block diagram illustrating a power distribution means and a conventional safety breaker. 11...High voltage distribution line, 12...Pole transformer, 1
3...Low voltage distribution line, 14...Safety breaker, 15
...Indoor distribution line, 16-18...Outlet, 1
9... Breaker, 20... Zero-phase current transformer, 21... Leakage detector, 22... Engine generator, 23... Plug, 24... Winding, 25... Backflow detector.

Claims (1)

[Scope of utility model registration request] A ground leakage detector that guides power from the power supply through a circuit breaker and a zero-phase current transformer in series to a power supply unit, and detects a leakage current flowing through the zero-phase current transformer to turn off the circuit breaker. The safety breaker device includes a reverse current detector that detects a reverse energization state from the zero-phase current transformer side to the breaker side and causes current to flow through the zero-phase current transformer, A safety breaker device with backflow prevention, characterized in that the current flowing through the zero-phase current transformer by a backflow detector is configured to drive the earth leakage detector and turn off the circuit breaker. .