JPH0698468A - Portable distribution board provided with low-voltage phase advancer capacitor - Google Patents

Abstract

PURPOSE:To increase a power conservation effect while a power factor is being improved by a method wherein, when an electric apparatus is operated, low- voltage phase advancer capacitors are connected in parallel individually and, when it is not operated, the capacitors are cut off. CONSTITUTION:A portable distribution board is provided with low-voltage phase advancer capacitors 8, 9. An electric apparatus is connected to a terminal plate 11, circuit breakers 1, 3 for wiring use are turned on, and the electric apparatus is operated. Then, an electric current flows in a wiring 12. A current transformer 4 informs a meter relay 2 that the electric current flows. The meter relay 2 turns on electro-magnetic switches 6, 7. When the electric current does not flow in the interconnection 12, the current transformer 2 informs the meter relay 2 that it does not flow, and turns off the electromagnetic switches 6, 7. Consequently, the low-voltage capacitors 8, 9 as phase advancers are connected in parallel only when the electric apparatus is operated. Thereby, it is possible to sharply reduce an electric current flowing on the primary side.

Description

Detailed Description of the Invention

[0001]

[Industrial applications]

The present invention is characterized in that a low voltage phase advance capacitor is attached to a portable distribution board.

[0003]

[Prior Art and Problems to be Solved by the Invention]

Since the conventional distribution board does not have the function of improving the power factor of electric equipment, it is necessary to select a large wiring size on the primary side. From another point of view, there was a limit to the number of electric devices that could be connected to a power supply facility with a certain capacity, and it did not have a power saving effect.

The present invention has been made to eliminate these drawbacks.

[0006]

[Means for Solving the Problems]

Means for solving the problems of the present invention are as follows.

A low-voltage phase-advancing capacitor is installed in the box of a portable distribution board, the low-voltage phase-advancing capacitors are individually connected in parallel when each electric device is operated, and the capacitors are connected when not in operation. A portable distribution board with a low-voltage phase advance capacitor that is designed to be disconnected.

[0009]

【Example】

An embodiment of the present invention will be described below with reference to the drawings.

When the electric device (5) is used and is operated via this distribution board, the phase advancing capacitor (8) or (9) is automatically connected in parallel with the electric device (5), It is possible to improve the primary side of an electric device having a relatively low power factor of 50% to 60% to a power factor of about 90%.

Explaining the mechanism in detail, the electric equipment (5) is connected to the terminal board (11), and the wiring breakers (1) and (3) are turned on to operate the electric equipment. For example, a current flows through the wiring (12). The current transformer (4) informs the meter relay (2) that the current has flowed, and the meter relay (2) turns on the electromagnetic switch (6) or (7).

When no current flows through the wiring (12), the current transformer (4) informs the meter relay (2) that no current flows and turns off the electromagnetic switch (6) or (7). .

By this mechanism, the low voltage phase advance capacitor (8) or (9) is connected in parallel only when the electric device is in operation. This low voltage advance capacitor (8)
Alternatively, the capacity of (9) is selected according to the capacity and power factor of the electric device to be used. When the electric device is not operated, the discharge coil (10) discharges the electric charge accumulated in the low voltage phase advance capacitor (8) or (9).

In the circuit as described above, while the electric device (5) is in operation, it flows to the primary side as compared with the case where the low voltage phase advance capacitors (8) or (9) are not connected in parallel. The current can be greatly reduced.

Therefore, it is possible to reduce the cable size by the amount that the primary side current is reduced. If the cable size is left unchanged, the load can be increased by the amount of the margin.

Although not shown in the circuit diagram, in the case of a welding machine or the like, the contacts of the electromagnetic switch (6) or (7) are likely to be worn out frequently because of frequent repetitions of operation and stop. Therefore, a timer is provided to control ON and OFF together.

[0018]

【The invention's effect】

According to the present invention, with respect to electric equipment having a low power factor, the power factor can be improved individually and diligently at the place closest to the place of use, and the work can be performed more economically and the power saving effect can be improved. be able to.

[Brief description of drawings]

FIG. 1 is a main circuit diagram of the present invention.

[Explanation of symbols]

 1 Wiring breaker (MCB) 2 Meter relay (MR) 3 Wiring breaker (MCB) 4 Current transformer (CT) 5 Electric equipment (W) 6 Electromagnetic switch (M) 7 Electromagnetic switch (M) 8 Low voltage advance capacitor (SC) 9 Low voltage advance capacitor (SC) 10 Discharge coil (HL) 11 Terminal board (TB) 12 Wiring

Claims (1)

[Claims] 1. A low-voltage phase-advancing capacitor is built into a portable distribution board box, and each low-voltage phase-advancing capacitor is connected in parallel when each electric device is in operation. A portable distribution board with a low-voltage phase-advancing capacitor that allows the capacitor to be disconnected.