US 6,661,238 B2 · Abnormality diagnosis method and apparatus for separable transformer

Abstract

A diagnosis apparatus (20) mounted to a separable transformer includes an arithmetic control section (27) for inputting, through a differential amplifier (24), a signal smoothing circuit 25 and a voltage detecting section (26), a mutual induction signal generated in a primary coil (11) of the separable transformer when dc power from a dc power supply section (21) and an ac signal from an oscillator (22) are applied to a capacitor (C) which cooperates with the primary core to form a resonance circuit. The arithmetic control section determines the presence or absence of a wire breakage or short-circuit failure in a secondary-side closed circuit of the separable transformer by comparing a frequency characteristic of mutual induction signal, determined based on mutual induction signals successively supplied thereto while the frequency of the ac signal from the oscillator varies, with frequency characteristics for normal, wire breakage and short-circuit conditions stored beforehand in a storage section (28).

Claims15

Dependent claims

An abnormality diagnosis method for a separable transformer having primary and secondary coils thereof adapted to be electromagnetically coupled to each other and wound individually on primary and secondary cores that are arranged to face each other with a predetermined gap there_between for relative rotation, comprising the steps of:

(a) measuring mutual induction signals each generated in the primary coil of the separable transformer when an ac signal having a corresponding one of different frequencies is applied to the primary coil;
(b) determining a frequency characteristic of mutual induction signal based on the mutual induction signals measured individually at the different frequencies of the ac signal in the step (a);
and
(c) determining an occurrence of a short-circuit or wire breakage failure in a closed circuit including the secondary coil of the separable transformer and a load connected thereto, based on the frequency characteristic of mutual induction signal determined in the step (b).

1 more element

An abnormality diagnosis apparatus for a separable transformer having primary and secondary coils thereof adapted to be electromagnetically coupled to each other and wound individually on primary and secondary cores that are arranged to face each other with a predetermined gap there between for relative rotation, comprising:

signal applying means for successively applying ac signals having different frequencies from each other to the primary coil of the separable transformer;
signal detecting means for detecting mutual induction signals each generated in the primary coil when a corresponding one of the ac signals is applied to the primary coil, thereby detecting the mutual induction signals;
frequency characteristic determining means for successively detecting frequencies of the ac signals and determining a frequency characteristic of mutual induction signal from the frequencies of the ac signals and the mutual induction signals detected by the signal detecting means;
and
abnormality determining means for successively detecting frequencies of the ac signals and for determining an occurrence of a short-circuit or wire breakage failure in a closed circuit including the secondary coil of the separable transformer and a load connected thereto, based on the frequency characteristic of mutual induction signal determined by the frequency characteristic determining means.

2 more elements

Dependencies are inferred from the claim text.

Abnormality diagnosis method and apparatus for separable transformer

Life of this patent

Abnormality diagnosis method and apparatus for separable transformer

Life of this patent

Abstract

Claims15