Water monitoring system and water monitoring method for high...

Details Water monitoring system and water monitoring method for high... Water monitoring system and water monitoring method for high...

2005-05-24

2005-05-24

Lieu, Julie B. (Department: 2636)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S660000, C340S661000, C340S662000, C340S663000, C324S522000

Reexamination Certificate

active

06897784

ABSTRACT:
A water monitoring system and a water monitoring method for a high voltage cable including a conductor and a screen surrounding the conductor. At least a first water sensing wire extends in the screen between the cable beginning and the cable end and at least a second wire is connected with the first wire at the cable end to form a loop. A first switching unit is provided between the cable beginning and the measurement circuit. A control unit controls the first switching unit over a first predetermined time interval into a first switching state in which the water sensing wire and the second wire are connected to the screen potential. In a following second predetermined time interval the control unit controls the first switching unit into a second switching state in which the water sensing wire and the second wire are disconnected from the screen potential. The measurement circuit performs a water intrusion measurement in the second predetermined time interval.

REFERENCES:
patent: 4980645 (1990-12-01), Soma et al.
patent: 195 27 972 (1997-01-01), None
patent: 195 44 391 (1997-05-01), None
U. Glaese et al., “Uberwachung von Hochspannungskabelanlagen Methoden und Kundennutzen”, Elektricitatswirtschaft, vol. 24, No. 16, pp. 992-1000 (1995).
U. Glaese, “Entwicklung eines automatisierten Monitoring Systems fur Hochspannungskabul”, VDI- Fortschritt-Berichte 321, pp. 106-113, (1996).

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