JPS5974615A - Common transformer - Google Patents

Abstract

PURPOSE:To obtain a common transformer by a method wherein three windings of the secondary are connected in delta and output lines of single-phase three- line system are drawn out from two intermediate taps provided to two windings of three and the junction of those two windings and output lines of three-phase three-line system are drawnout from three junctions of three windings. CONSTITUTION:Secondary windings 11', 12', 13' of a transformer are connected in delta and intermediate taps 21', 22' are provided to two windings 11', 12' of them. Then voltage lines (u), (v) of electric lamp lines of single-phase three-line system are drawn out from the taps 21', 22' and a neutral line (n) with an earth point 6 is drawn out from the junction V of the windings 11', 12' and the power is supplied to a single-phase load. A voltage line S, which has an earth point 5, of power lines of three-phase three-line system is also drawn out from the junction V and from other junctions U, W voltage lines R, T are drawn out and the power is supplied to a three-phase load. The power can be supplied at the same time to the loads connected to the single-phase three-line system electric lamp lines with a grounded neutral and the three-phase three-line system power lines with one phase grounded by one transformer without reforming the circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an electric lamp suitable for simultaneously supplying power to a single-phase three-wire power line load and a three-phase three-wire power line load.

Regarding power sharing transformers.

In a three-phase 200■ class power line, if the first phase is R, the second phase is S, and the third phase is T, then one of the R, S, and T phases must be grounded, and normally the S phase is grounded. Figure 1 is a secondary side connection diagram of a three-phase transformer dedicated to power lines.The six windings 1, 2.5 on the secondary side are connected in delta and pulled out from the respective connection points U, V, and W. Three-phase three-wire power line R, S, T
Supplies power to three-phase loads through. 5 is its grounding point.

In addition, in the case of two single-phase three-wire power lines, normally voltage lines U, V and a neutral wire n are drawn out from the secondary winding 4 of a single-phase transformer, and the neutral wire n is grounded, as shown in Figure 2. to supply power to single-phase loads. This is the grounding point of 6.

FIG. 3 is a secondary (Jllll) wiring diagram of a conventionally used 100/200 square lamp/power sharing transformer.

This is the three windings 1 j ', 12, 13 on the secondary side.
are connected in delta, three-phase three-wire power lines R, S, and T are drawn out from the respective connection points U, V, and W, and one winding 1 is connected.
1 is provided with an intermediate tap 21, and this is connected to both sides.
This is because the vehicle phase three-wire electric lamp, glands u, n, and v are drawn out from V to simultaneously supply power to the three-phase load and the fluorescent phase load, and only the single-phase side neutral wire nK has a grounding point 6.

Lighting and power sharing transformers are often in demand for power receiving equipment in buildings, factories, etc. from an economic standpoint, but according to the conventional configuration shown in Figure 3, grounding is only done by vehicles; Fa fJ11 + neutral wire. It is not possible to ground other points because this would result in double grounding. - Two, three-phase three-wire power lines R, S, T
A wooden transformer cannot be used with existing power receiving equipment that is grounded at either end, and the disadvantage is that the circuit must be modified to use it.

It is an object of the present invention to provide one transformer without requiring modification of one circuit for each load of a single-phase three-wire power line with neutral line grounding and a three-phase three-wire power line with one-phase grounding. It is an object of the present invention to provide a transformer for lighting and power that eliminates the drawbacks of the above-mentioned prior art by simultaneously supplying electric power through the transformer and reducing the no-load loss and the space for installing the transformer.

In order to achieve the above object, the present invention changes the point where the single-phase three-wire power line from the secondary winding of the transformer is drawn out, so that the point where the neutral wire on the heavy-phase side and the grounding line on the three-phase side match are drawn out. This is what I did.

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

As shown in Figure 4, the three windings 11' on the secondary side of the transformer
, 12', 13' are connected in delta, and two of them, 11', 12', have intermediate taps 21', 22'.
will be established. And these intermediate tubes 21', 22
The voltage lines U and V of the single-phase three-wire power line are drawn out from the connection point ■ of the two windings 11' and 12', and the neutral wire n having the ground point 6 is drawn out from the connection point ■ of the two windings 11' and 12', respectively, and power is supplied to the single-phase load. supply From the connection point V of the two windings 11', 12', a voltage line S having a ground point 5 in the three-phase three-wire power line is also drawn out, and this and the other two connection points U are drawn out.

Power is supplied to the three-phase load through voltage lines R and T drawn from W.

In the electric lighting/power sharing transformer according to the present invention configured as described above, the lead-out points of the heavy-phase side neutral wire and the three-phase side grounding wire on the secondary side of the transformer coincide, so that the neutral wire is grounded. It is possible to simultaneously supply power to each load of a single-phase, three-wire power line with one-phase grounding and a three-phase, three-wire power line with one-phase grounding using one transformer without modifying the circuit. Parallel operation with the existing three-phase transformer is also possible. - Wooden transformers can be used with existing power receiving equipment without any problems, significantly reducing no-load loss compared to installing power line transformers and power line transformers separately, and making it easier to install transformers. This has great economic effects such as space reduction.

[Brief explanation of the drawing]

Figure 1 is a secondary side connection diagram of a three-phase power line transformer, Figure 2 is a secondary side connection diagram of a single-phase transformer exclusively for power lines, and Figure 3 is a secondary side connection diagram of a power line dual-use transformer. Secondary side connection diagram - Fig. 4 is a secondary side connection diagram of the electric light and power sharing transformer according to the present invention. 11', 12', 13': Secondary winding of the electric light/power sharing transformer according to the present invention - 21', 22': Intermediate tap. ``J, V, W: Secondary winding connection point, R, S, T: Three-phase three-wire power line, u, n, v: Single-phase three-wire power line, 5: Three-phase side grounding point, 6: Grounding point on the fire phase side.

Claims (1)

[Claims] The three windings on the secondary side are connected in delta, and the intermediate tap provided on two of the windings and the connection point between these two windings are used as the extraction point for the single-phase three-wire output line. A shared transformer with each connection point as a lead-out point for three-phase, three-wire output lines.