JPS6244513Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a suppression load for suppressing resonance when fero-resonance occurs in a capacitor type potential transformer.

Figure 1 shows an invention (Japanese Patent Publication No. 39-9510) relating to a suppressing load by the same applicant as the present application, that is, a suppressing load consisting of a series circuit of a saturable reactor and a resistor for suppressing ferroresonance in a capacitor-type voltage transformer. The added circuit diagram shows that the high voltage applied between the high voltage terminal 1 and the ground is divided by the main capacitor 2 and the voltage dividing capacitor 3 connected in series, and then applied to the transformer 4, which is isolated from the high voltage side. At the same time, the voltage is reduced to an appropriate voltage value, and the secondary output terminals 5 and 6 are
join. Note that 7 is a resonant reactor.

Here, in order to suppress the resonance (ferro-resonance) caused by the reactance of the main capacitor 2, the voltage dividing capacitor 3, and the transformer 4, a suppressing load consisting of a series circuit of a saturable reactor 8 and a resistor 9 is provided. Since the saturable reactor 8 has a high impedance, almost no current flows through the resistor 9, and therefore no loss occurs due to the resistor 9. When ferroresonance occurs and the applied voltage to the saturable reactor 8 increases,
The saturable reactor 8 becomes saturated and the impedance value decreases, and the resistor 9 acts to suppress fero-resonance.

Conventionally, this suppression burden was achieved by separately manufacturing and installing the saturable reactor 8 and resistor 9, but
This resulted in a disadvantage that the number of parts increased and that space was required to install these parts.

On the other hand, the saturable reactor 8 and the resistor 9 can be integrated by using a resistance wire as a part of the winding of the saturable reactor in place of the resistor 9. However, the resistance value of the resistor 9 needs to be changed according to the primary voltage and the capacitance values of the main capacitor and the voltage dividing capacitor. In response to the change in the number of turns of the copper wire, the number of turns of both the copper wire and the resistance wire must be adjusted.

The present invention solves this drawback, and embodiments thereof will be described in detail below.

FIG. 2 shows an example of the saturable reactor according to the present invention, in which a is a plan view and b is a sectional view taken along the cutting line -'. Here, 11 is a ring-shaped iron core,
12 is a winding made of a conductive wire, such as a copper wire, wound around the iron core 11; 13 is an insulator provided on the outer periphery of the winding 12; and 14 is the iron core 1 on the outer periphery of the insulator.
It is a resistance wire wound in the circumferential direction of 1. Note that, for the sake of simplicity, the resistance wire 14 is shown wound less than once in FIG.

In this case, the winding 12 wound around the iron core 11 forms the suppressing inductance, that is, the saturable reactor 8 in FIG. 1, and the resistance wire 14 wound around the outer periphery of the winding 12 forms the resistor 9. That is, the iron core 11 is made of a so-called ring iron core formed by winding a tape-shaped magnetic material, for example, and a copper wire is wound around this to form a winding 12 to form the saturable reactor 8. On the other hand, winding 12
An insulator 13 formed by wrapping a short cylindrical piece of insulating paper, for example, is provided around the outer periphery of the insulator 13, and a resistance wire 14 is wound around the outer periphery of the insulator 13 in the circumferential direction to form a resistor 9. In this case, the magnetic field generated by the resistance wire 14 is in a direction perpendicular to the magnetic path of the iron core 1, and does not have any influence, but merely acts as a resistance.

With this structure, only one type of copper wire is used as the winding wire to be wound around the iron core, and the saturable inductance and resistance, which serve as suppression burdens, are integrated. This can be done using only the length of the wound resistance wire 14, and there is no need to touch the winding 12. moreover,
The resistance wire 14 can also serve as a fixed binding for the insulating paper constituting the insulator 13, and in some cases, taping of the insulating paper can be omitted.

As explained above, according to the present invention, it is possible to integrate a saturable reactor and a resistor, and to obtain a suppressing load whose resistance value can be easily adjusted.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a capacitor-type potential transformer with added suppression load, and FIGS. 2a and 2b are a plan view and a sectional view taken along the cutting line of an embodiment of the present invention. 11...Ring-shaped iron core, 12...Reactor winding, 14...Resistance wire.

Claims (1)

[Scope of utility model registration request] A saturable reactor is made by winding a conductive wire around a ring-shaped iron core, and the outer circumference of this saturable reactor,
A restraining load of a capacitor-type voltage transformer, characterized in that a resistance wire is wound in the circumferential direction of the iron core, and the resistance wire and the saturable reactor are connected in series.