DIRECT CURRENT INSULATION RESISTANCE MONITORING SYSTEM

• Main Authors: SATO TAKASHI, WATANABE TAKAYASU, SATO SHINDAI, ISHIZAKI SHINICHI
• Format: Patent
• Language: English; Japanese
• Published: 25.04.2024
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

To monitor a direct current insulation resistance of a power distribution system using live wires without requiring high-sensitivity current measurement means and without a measurement result being affected by external noise, in a direct current insulation resistance monitoring system.SOLUTION: A direct current insulation resistance monitoring system has: an insulation capacitor that is opened and closed by a neutral point switch of a grounded instrument transformer; a direct current power source that charges the insulation capacitor; a direct current power source switch that opens and closes the connection between the direct current power source and the insulation capacitor; an opening/closing control unit that controls each opening/closing state of the neutral point switch and the direct current power source switch; and a voltage measurement unit that measures a voltage signal of the insulation capacitor.SELECTED DRAWING: Figure 1 【課題】直流絶縁抵抗監視システムにおいて、高感度な電流測定手段が不要で、測定結果が外部ノイズの影響を受けずに活線で配電系統の直流絶縁抵抗を監視する。【解決手段】接地形計器用変圧器の中性点用開閉器により開閉される絶縁用コンデンサと、前記絶縁用コンデンサを充電する直流電源と、前記直流電源と前記絶縁用コンデンサとの接続を開閉する直流電源開閉器と、前記中性点用開閉器と前記直流電源開閉器の開閉状態をそれぞれ制御する開閉制御部と、前記絶縁用コンデンサの電圧信号を測定する電圧測定部とを有する。【選択図】図１