| 摘要 |
PURPOSE: An insulation status monitoring apparatus of power equipment and a method thereof are provided to judge degree of danger of insulation status of the power equipment accurately even under the state that a partial discharge measurement value of the power equipment is changed frequently during a constant period. CONSTITUTION: An insulation status monitoring apparatus of power equipment includes a sensor part, an analog-digital conversion part(40) and an operational calculation part(200). The sensor part senses partial discharge during a constant period from a power equipment(10). The analog-digital conversion part(40) converts a signal component in a determined frequency band of a signal of the partial discharge sensed by the sensor part into digital data per sensing date. The operational calculation part calculates standard deviation value from each digital data, and compares the calculated standard deviation value with a predetermined standard deviation boundary value in order to judge the insulation status of the power equipment. [Reference numerals] (10) Power equipment; (100) Storage part; (110) Display part; (120) Date input part; (130) Alarm output part; (20) PD sensor part; (200) Operational calculation part; (30) Filter and amplifier part; (40) A/D conversion part
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