JPH10135052A - Phase current balancer of auto-transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a phase current of an auto-transformer, such that the currents are controlled to be uniform and also unbalance between interphase voltage are adjusted to use electricity safely and effectively, even if the interphase loads are connected to be unbalanced. SOLUTION: A balance coil A is divided into a coil A1 of a half turns and a coil A2 of a half turns, and a coil B for decreasing leakage impedance is divided into a coil B1 of a half turn ratio and a coil B2 of a half turn ratio as shown by the formula below. The coils A1, B2 are wounded to R-N phase, and the coils A2, B1 are wounded to S-N phase, and the coils B1, B2 of the coil B are connected inversely. (A1+B2):(A2+B1)=1:1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention controls a current evenly even when load connections between phases are unequally connected, and adjusts unequal voltage between phases to ensure safe and effective use of electricity. The present invention relates to an improvement of a phase current balancer of an autotransformer to be used.

[0002]

2. Description of the Related Art As shown in FIG. 5, a conventional phase current balancer of an autotransformer is constructed by balancing coils A1 and A2 having the same size and a turns ratio of 1, so that the current directions are opposite to each other. Then, the line currents are balanced so that the currents of both outer lines flow equally. The phase current balancer has a current i
When 1> i2, the current is i1 <i in the direction of the solid line arrow.
At the time of 2, it flows in the direction of the dotted arrow. In addition, the current of the phase current balancer flows in the order of C → D → S → N → N1 → N2 → CF → E → R → N → N1 → N2 → F. Work to make the currents equal.

[0003]

However, the above-mentioned prior art can balance the inter-phase current and adjust the imbalance of the inter-phase voltage, but has the drawback that it cannot prevent the leakage impedance generated from the structure of the transformer. there were. According to the present invention, the balance coil A and the leakage impedance reducing coil B are divided into half-turn coils A1, A2, B1, and B2, and the leakage impedance reducing coil B is reversely connected to evenly distribute the current and the voltage. In addition, the present invention is to realize a phase current balancer capable of reducing a leakage impedance generated from a structure of a transformer.

[0004]

Means for Solving the Problems The present invention has the following structure as means for solving the above problems.

According to the invention to be patented, the balance coil A is divided into a half-turn coil A1 and a half-turn coil A2, and the leakage impedance reducing coil B has the following turn ratio formula. Is divided into a 1/2 turn ratio coil B1 and a 1/2 turn ratio coil B2,
A1 and B2 coils are wound around the RN phase, and A2 is wound around the SN phase.
And B1 are wound, and B1 and B2 of the leakage impedance reduction coil B are reversely connected. This is a phase current balancer of an autotransformer. (A1 + B2): (A2 + B1) = 1: 1

The leakage impedance reducing coil B (B1,
B2) is, as described above, the balance coil A (A1, A
Combined with 2), the turns ratio becomes 1, so that RN
Even if the interphase current between the phase and the SN phase is i1> i2, i1
Even in the state <i2, the inter-phase current is controlled to be equal to i1 = i2, and the current balance is equally controlled.
V2 approaches evenly.

At the same time, the leakage impedance can be reduced by reversely connecting B1 and B2 of the leakage impedance reduction coil B. In other words, the leakage impedance reducing coil B serves not only as a balance coil but also as a part for reducing the leakage impedance, thereby making it possible to equalize the phase currents and to provide a transformer with less loss.

[0008]

The principle of the present invention is as follows. First, a balance coil A (A1, A2) and a leakage impedance reduction coil B (B1, B2) are prepared. However,
The turns ratio of these coils is as follows. A1, A2 = 1/2 turn ratio B1, B2 = 1/2 turn ratio

Next, the balance coil A (A1, A2) and the leakage impedance reduction coil B (B1, B2) are shown in FIG.
As shown in the figure, the A1 and B2 coils and the S-N
Connect the A2 and B1 coils to the phases. Moreover, the coils B (B1, B2) are connected in reverse. As a result, the turns ratio becomes (A1 + B2) :( A2 + B1) = 1: 1, and the B coil functions as a balance coil.

That is, the current between the RN phase and the SN phase is i
Even if 1> i2 or i1 <i2, the inter-phase current is uniformly controlled to i1 = i2, and the inter-phase voltage is also equal to V1 = V2.
Reduce leakage impedance.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments. FIG. 1 is an explanatory diagram of a phase current balancer of an autotransformer according to the present invention, FIG. 2 is an explanatory diagram showing a case where load connections between phases are unequal, and FIG. FIG. 4 is an explanatory diagram illustrating a case where the phase current balancer of the autotransformer according to the present invention is implemented when the load connections of the present invention are not uniform. FIG. 4 is an explanatory diagram illustrating the principle of the present invention, and FIG. It is explanatory drawing of the phase current balancer of the conventional autotransformer.

The phase current balancer of the autotransformer according to the present invention comprises a balance coil A having a half turn number of coils A1 and A2.
It is divided into a coil A2 having one-half turn. Further, the leakage impedance reducing coil B is also divided into a coil B1 having a half turn number and a coil B2 having a half turn number. A single winding characterized in that coils of A1 and B2 are wound around the RN phase, coils of A2 and B1 are wound around the SN phase, and B1 and B2 of the leakage impedance reducing coil B are reversely connected. It is a transformer phase current balancer. The leakage impedance reduction coil B is a coil that plays a role of reducing the leakage impedance and a coil that plays a role of equalizing the inter-phase current balance. That is, the ratio becomes (A1 + B2) :( A2 + B1) = 1: 1.

Therefore, in the phase current balancer, the current becomes i by the action of B1 and B2 of the leakage impedance reducing coil B.
When 1> i2 and the current is i1 <i2,
Control is performed so as to approach i1 = i2. Then, the current of the phase current balancer flows as follows: C → D → S → N → N1 → N2 → CF → E → R → N → N1 → N2 → F The phase current balancer works so as to equalize the currents of both external lines, and reduces the leakage impedance.

FIG. 2 is an explanatory diagram showing a case in which load connections between phases are unequal. At a supermarket, single phase 3
In the case where the lighting equipment is installed in a wire system, the load connection by the lighting fixtures between the phases is not evenly connected, so that the current between the phases flows unequally, and a bias phenomenon occurs. This results in a lack of safety and an inefficient use of electricity. That is, because the load connections are uneven, one side is 12A and the other is 4A
, And a current of about 8 A flows through the N-phase (neutral line), resulting in a non-uniform current between phases. The voltage is also in the state of V1 <V2.

FIG. 3 shows an embodiment of the use of the phase current balancer of the autotransformer according to the present invention. When the load connections of the embodiment shown in FIG. 2 are unequal, the phase current balancer of the autotransformer according to the present invention is installed, so that even if the correlation load connections are unequal, the interphase current is reduced. Since it is controlled to flow evenly, and the unevenness of the inter-phase voltage can be adjusted, the safe and effective use of electricity is enabled. That is,
Since the wattage and the number of lamps of the lighting equipment, which are loads of the RN phase and the SN phase, are significantly different, the load connection between the phases is not uniform. Are controlled to be equal, and the current flowing in the N-phase (neutral wire) is also controlled so as to approach 0 amperes, so that safe and effective use of the electric equipment becomes possible. Even if some noise is mixed in the power supply, it is improved by the transformer section in the phase current balancer.

[0016]

In the phase current balancer of the autotransformer according to the present invention, the balance coil A is divided into a half-turn coil A1 and a half-turn coil A2, and the leakage impedance reducing coil B is divided into two. Is divided into a 1 turn ratio coil B1 and a 1/2 turn ratio coil B2, and A1 and B are added to the RN phase.
2 and the A2 and B1 coils are wound around the SN phase, and B1 and B2 of the leakage impedance reduction coil B are connected in reverse, so that the interphase current between the RN phase and the SN phase is reduced. Even if they are unequal, the phase current balance is controlled evenly, and the inter-phase voltage approaches even, so that the leakage impedance can be reduced.

That is, when the phase current balancer of the autotransformer according to the present invention is used, even if the load is uneven, it is always safe and effective use of electricity is possible.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a phase current balancer of an autotransformer according to the present invention.

FIG. 2 is an explanatory diagram showing a case where load connections between phases are uneven.

FIG. 3 is an explanatory diagram of a case where the phase current balancer of the autotransformer according to the present invention is implemented when the load connections in FIG. 2 are uneven.

FIG. 4 is an explanatory diagram showing the principle of the present invention.

FIG. 5 is an explanatory diagram of a phase current balancer of a conventional autotransformer.

[Explanation of main signs]

 A1: Balance coil A2: Balance coil B1: Leakage impedance reduction coil B2: Leakage impedance reduction coil i1: Interphase current of SN phase i2: Interphase current of RN phase

Claims (1)

[Claims] 1. When there are an RN phase and an SN phase,
The balance coil A is divided into a half-turn coil A1 and a half
The winding impedance reduction coil B is divided into a 1/2 turn ratio coil B1 and a 1/2 turn ratio coil B2 so as to satisfy the following turn ratio equation. The coils of A1 and B2 are wound around the RN phase, and S-
A phase current balancer for an autotransformer, wherein coils A2 and B1 are wound around the N phase, and B1 and B2 of the leakage impedance reduction coil B are connected in reverse. (A1 + B2): (A2 + B1) = 1: 1