TRANSFORMER DETERIORATION STATUS DISPLAY DEVICE

To provide a transformer deterioration status display device that can continuously display a deterioration status of a transformer.SOLUTION: One of degradation gradients in a graph group of polymerization degree degradations with time of a transformer insulation paper is defined as a polymerization degree degradation reference gradient Kc; a temperature of an insulation paper of a transformer to be diagnosed under a reference use condition and in an actual use state is calculated from an insulation-oil temperature or an installation site temperature of the transformer to be diagnosed and operation electric currents of the transformer to be diagnosed, by utilizing an approximation formula of the insulation-oil temperature with respect to load factor of the transformer; a polymerization degree degradation gradient correction coefficient R is calculated based on a formula of R=1/exp(-H×Tzs) from an insulation paper temperature difference Tzs between the insulation paper temperature under the reference use condition and the insulation paper temperature in the actual use state; the calculated polymerization degree degradation gradient correction coefficient R is multiplied by a reference gradient Kc to determine an actual gradient K of the polymerization degree degradation; and a transition of polymerization degrees from the past to the present time, which are degraded by the actual gradient K and a transition of polymerization degrees in the future are displayed on a graph 30.SELECTED DRAWING: Figure 3 【課題】変圧器の劣化状況を連続的に表示することが可能な変圧器劣化状況表示装置を提供する。【解決手段】変圧器絶縁紙の重合度経時低下グラフ群の低下勾配の一つを重合度低下基準勾配Ｋｃとし、変圧器の負荷率に対する絶縁油温度の近似式を利用して、被診断変圧器の絶縁油温度または設置場所温度と運転電流より基準使用条件と実使用状態における被診断変圧器の絶縁紙の温度を算出し、基準使用条件における絶縁紙温度と実使用状態における絶縁紙温度との絶縁紙温度差Ｔｚｓから重合度低下勾配補正係数Ｒを、Ｒ＝１／ｅｘｐ（−Ｈ×Ｔｚｓ）にて算出し、算出した重合度補正係数Ｒを基準勾配Ｋｃに乗じて重合度低下の実勾配Ｋを導き、実勾配Ｋにより低下する過去から現時点までの重合度推移と、将来の重合度推移をグラフ表示３０する。【選択図】図３