GAS LEAKAGE DETECTOR OF GAS CIRCUIT BREAKER

PROBLEM TO BE SOLVED: To provide a gas leakage detector capable of swiftly detecting an abnormality of gas leakage.SOLUTION: The gas leakage detector includes an operation unit that performs an operation to convert a gas pressure into a pressure value at a reference temperature based on a gas pressure and a gas temperature detected by a gas pressure/gas temperature detection section and outputs the calculation result as a converted gas density. The operation unit calculates a converted gas density at a gas temperature assumed as identical. The operation unit also calculates an inclination value of an approximation straight line waveform which is calculated by using the converted gas density at the gas temperature assumed as identical. The operation unit determines existence/absence of gas leakage abnormality based on a maximum value envelope waveform connecting maximum values of the inclination values or a minimum value envelope waveform connecting minimum values of the inclination values. 【課題】ガス漏れ異常を早期に把握することができるガス漏れ検出装置を得ること。【解決手段】ガス漏れ検出装置に具備される演算部は、ガス圧力・ガス温度検出部が検出したガス圧力およびガス温度から、ガス圧力を基準温度における圧力値に換算する演算を行い、その演算結果を換算ガス密度として算出する。また、演算部は、同等と見なされるガス温度での換算ガス密度を算出するとともに、当該同等と見なされるガス温度での換算ガス密度を用いて求めた近似直線波形の傾き値を算出し、当該傾き値の極大値を繋ぐ極大値包絡線波形または当該傾き値の極小値を繋ぐ極小値包絡線波形に基づいて、ガス漏れ異常の有無を判定する。【選択図】図４