Inbetriebnahmeprüfungen der 400-kV-VPE-Kabelanlage der Bewag Berlin

摘要

For the first time, the commissioning tests performed on a 6.3-km double-circuit line of a 400-kV XLPE cable system were by means of variable-frequency AC test voltage combined with PD measurement on joints and sealing ends. The required test capacity of ap-prox. 30 MVA was supplied by the mobile two-stage AC high-voltage test system. The requirements to be met by the test system and their technical implementation are pointed out, the test arrangement and the connection equipment are explained. During PD measurement each of the joints was equipped with directional coupler sensors. They provide high sensitivity and selectivity of measurement. The measured values of all joints are simultaneously acquired and transmitted via fibre optic cable to the central evaluation system. The accomplishment of these dielectric tests at up to 400 kV and of the high-sensitivity PD measurements performed on the joints at a PD detection level of 2 pC confirms that such test and measuring systems are capable of providing evident commissioning and diagnosis tests on extra-high voltage cables even under severe on-site conditions.%Die Inbetriebnahmeprüfungen an einem 6,3 km langen Doppelsystem einer 400-kV-VPE-Kabelanlage wurden erstmalig mit einer Prüfwechselspannung variabler Frequenz in Kombination mit TE-Messungen an den Muffen und Endverschlüssen durchgeführt. Die erforderliche Prüfleistung von rd. 30 MVA wurde mit einem für diesen Anwendungsfall konzipierten zweistufigen transportablen Resonanzprüfsystem erzeugt. Die Anforderungen an das Prüfsystem und ihre technische Umsetzung werden dargelegt, der Prüfaufbau und die Anschlußtechnik erläutert.