JPH0216097B2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a distribution board.

In a conventional distribution board that is equipped with a main broker and a branch breaker, and employs an earth leakage breaker as the main broker, when the main broker detects an earth leakage and operates to interrupt it, in which branch circuit the earth leakage occurs? However, it is difficult to determine whether the system is operating normally, and restoration is time-consuming, and during that time power supply to branch circuits that are not targeted is also stopped, which can lead to secondary disasters.

Therefore, an object of the present invention is to provide an indicator lamp on the display surface of the distribution board that serves both as an energization indicator and an earth leakage indicator for a multi-branch circuit, so that the earth leakage branch circuit can be easily identified even after the main earth leakage broker has tripped. The objective is to provide a distribution board that can

An embodiment of the invention is shown in FIGS. 1 and 2. That is, this distribution board has a main earth leakage breaker 1 installed at the main, branch breakers 2 installed at each branch circuit, and a front panel of the distribution board corresponding to the installation position of each branch breaker 2. Current/earth leakage indicator lamps 3 are installed at each position to indicate energization and leakage in each branch circuit, and branch circuits are installed in the primary branch circuit of each branch breaker 2 and connected to the branch circuit via the transformer CT. an energization detection circuit 4 that detects the energization current of the branch circuit breaker 2; , which is provided for each branch circuit, receives a detection signal from the corresponding energization detection circuit 4, drives the corresponding energization/leakage indicator lamp 3 to indicate energization, and receives a detection signal from the corresponding energization detection circuit 5. An indicator light driver circuit 6 receives the signal and drives the corresponding energization/earth leakage indicator 3 to indicate an earth leakage.
and each detection circuit unit 7 consisting of an energization detection circuit 4, an earth leakage detection circuit 5, and an indicator light driver circuit 6, which are supplied with power from the primary main body of the main earth leakage breaker 1 and arranged corresponding to each of the branch circuits. It is equipped with a DC power supply circuit 8 that supplies DC current to...
In FIG. 1, 2a is a tripping device for the branch breaker 2.

The main earth leakage breaker 1 includes a zero-phase current transformer ZCT ₁ that detects the earth leakage current flowing through the main, an earth leakage detection circuit 1a that determines the occurrence of an earth leakage accident based on the detection signal of the zero-phase current transformer ZCT ₁ , It includes a switching circuit 1b that performs a switching operation in response to an output signal from a detection circuit 1a, and a tripping device 1c that trips and drives a contact in response to the switching operation.

Each of the energization/leakage indicator lights 3 includes an LED 3a that emits red light to indicate energization, and an LED 3a that emits green light to indicate electricity leakage.
A pair of LEDs 3b are arranged in a display transparent body (not shown) arranged at a position corresponding to each of the branch breakers 2 on the front panel of the distribution board, and these LEDs 3a, 3b and The indicator light driver circuit 6 is connected by the circuit configuration shown in FIG. That is, the indicator light driver circuit 6 includes a first switching circuit 6a including two transistors Q ₁ and Q ₂ connected in series to the positive side of the DC power supply circuit 8, and a second switching circuit 6b including a thyristor SCR. By turning on the transistors Q ₁ and Q ₂ of the first switching circuit 6a, the DC power supply voltage V _CC changes to the energization display LED 3.
a, and due to the ON operation of the thyristor SCR of the second switching 6b, the DC power supply voltage V _CC
is applied to the earth leakage indicating LED 3b.

The transistor Q ₂ is turned on upon receiving a current conduction detection signal outputted from the current conduction detection circuit 4 via the resistor R ₃ at its base, and the thyristor SCR receives a leakage detection signal outputted from the leakage detection circuit 5 at its gate terminal. When no leakage detection is performed, the transistor Q ₁ is turned on by the bias applied by the series circuit of resistors R ₁ , R ₂ , LED 3b, and resistor R ₆ , and the first switching circuit 6a is turned on (i.e., turned on). Transistors Q ₁ and Q ₂ are turned on), and LED 3a for electricity indication lights up (at this time, the electricity leakage indication
(Since the voltage applied to LED 3b is low, LED 3b does not light up.) When a leakage is detected, the thyristor SCR of the second switching circuit 6b is turned on, and the LED 3b for indicating leakage turns on, while the resistor
As the voltage across R ₆ increases, transistor Q ₁
The bias of increases to turn off transistor _Q1 ,
The energization display LED 3a is turned off.

For earth leakage indication due to thyristor SCR ON operation
Since the lighting of the LED 3b is maintained by the self-holding function of the thyristor PCR, the DC power supply circuit 8 and each display are used as an earth leakage lighting reset means to recover after the earth leakage accident has been recovered. A return button 9 for resetting the earth leakage display, which is a normally closed contact, is provided in the middle of the line connecting the light driver circuit 6, and the return button 9 for resetting the earth leakage display is turned off instantaneously to achieve the return.

In addition, an earth leakage detection circuit 5 installed in each branch circuit
The earth leakage detection sensitivity and operating time of the main earth leakage breaker 1 installed in the main main are set higher and shorter than the sensitivity and operating time of the main earth leakage breaker 1, so that the main main is not cut off before the earth leakage display function is activated. .

In addition, in this embodiment, the energization display LED 3a and the current leakage display LED 3 each emit light in different colors.
A pair of b are installed side by side in the display transparent body, and the emitted light color of one indicator light is made to be different from red in the case of energization indication to green in the case of earth leakage indication, but it is not limited to this example, for example Of course, a single light source may be used and a predetermined indicator light driver circuit may be used to indicate energization by continuous lighting and to indicate short circuit by flickering.

With this configuration, the following effects can be obtained.

(1) It is possible to easily identify the branch circuit where an earth leakage accident has occurred after the main earth leakage breaker has tripped, allowing for quick response in the event of an earth leakage accident, and the branch circuit 2 of the branch circuit where the earth leakage accident has occurred.
By turning on the other branch circuit breaker 2 while turning off the branch circuit breaker 2, other branch circuits can be used in parallel with the repair of the branch circuit affected by the accident, thereby preventing secondary disasters caused by electric leakage accidents. It is possible to minimize the occurrence of problems and deterioration of operation.

(2) LED 3a for power indication and LED 3 for earth leakage indication inside the transparent body installed in one place on the front panel of the distribution board
b is attached as the current/earth leakage indicator light 3, which has two display functions, so you can quickly notice the occurrence of an earth leakage accident by paying close attention to the energization display, which is easy to pay attention to, and also Display components and other arrangement configurations on the face plate can be simplified, improving the efficiency of use of the board surface.

(3) Since the earth leakage indication is given priority over the energization indication, it is possible to detect even an earth leakage current that is less than the earth leakage detection sensitivity of the main earth leakage breaker 1 and to display an earth leakage indication.

(4) Since the second switching circuit 6b that turns on the earth leakage display LED 3b is configured using a thyristor SCR connected in parallel to the earth leakage detection circuit 5, after the earth leakage detection operation, the earth leakage detection circuit 5 is connected to the DC power supply circuit. Since the voltage V _CC from 8 is not applied, power consumption can be reduced.

As described above, the power distribution board of the present invention has a main earth leakage breaker provided at the main power supply, a branch breaker provided at each branch circuit, and a power leakage breaker provided on the surface of the power distribution board corresponding to the location of each branch breaker. energization/leakage indicator light, an energization detection circuit provided in each branch circuit, an earth leakage detection circuit provided in each branch circuit, and a detection signal of the energization detection circuit provided in each branch circuit and in that branch circuit. a first switching circuit for driving the energization/earth leakage indicator in response to a detection signal from the earth leakage detection circuit provided in each of the branch circuits and driving the energization/earth leakage indicator in response to a detection signal from the earth leakage detection circuit of the branch circuit; a second switching circuit that drives the current leakage display and turns off the first switching circuit; a power supply circuit that supplies driving power to the current/current leakage indicator lamp, the current/current detection circuit, and the current leakage detection circuit; Since it is equipped with an earth leakage lighting reset means that resets the earth leakage lighting state of the earth leakage indicator lamp, it is possible to easily identify the branch circuit where an earth leakage has occurred even after the main earth leakage breaker has tripped upon sensing an earth leakage. At the same time, by using one indicator light as both a current indicator and a current leakage indicator, you can quickly check the current leakage indicator, and quickly respond to an earth leakage accident. This has the effect of facilitating the arrangement of display components and other components.

[Brief explanation of drawings]

FIG. 1 is a schematic circuit diagram showing an embodiment of the present invention, and FIG. 2 is a detailed circuit diagram of the main part thereof. 1...Main earth leakage breaker, 2...Branch breaker, 3...Electricity/earth leakage indicator light, 3a...LED for electricity indication, 3b...LED for earth leakage indication, 4...Electricity detection circuit, 5...Earth leakage detection Circuit, 6... indicator light driver circuit, 6a... first switching circuit,
6b...second switching circuit, 8...DC power supply circuit, 9...return button for earth leakage display reset (earth leakage lighting reset means).

Claims (1)

[Claims] 1. A main earth leakage breaker provided in the main, a branch breaker provided in each branch circuit, and an energizing circuit breaker provided on the surface of the distribution board corresponding to the location of each branch breaker.
An earth leakage indicator lamp, an energization detection circuit arranged in each branch circuit, an earth leakage detection circuit arranged in each branch circuit, and an earth leakage detection circuit arranged in each branch circuit and receiving a detection signal from the energization detection circuit of the branch circuit. a first switching circuit that drives the energization/earth leakage indicator to indicate energization, and a first switching circuit that is provided in each of the branch circuits and drives the energization/earth leakage indicator in response to a detection signal from the earth leakage detection circuit of the branch circuit. and a second switching circuit that turns off the first switching circuit; a power supply circuit that supplies driving power to the current/current leakage indicator light, the energization detection circuit, and the current leakage detection circuit; and the current/current leakage indicator light. A distribution board comprising an earth leakage lighting reset means for resetting the earth leakage lighting state of the electricity supply. 2 The power/leakage indicator light is a pair of power indicator LED and earth leakage indicator LED that emit light in different colors.
The distribution board according to claim 1, which is formed in parallel in two light-transmitting bodies. 3. The energization/earth leakage indicator light consists of one light source, the first switching circuit continuously turns on the light source in response to a signal from the energization detection circuit, and the second switching circuit detects the current leakage detection circuit. 2. The electricity distribution board according to claim 1, wherein the light source flickers in response to a signal.