Switching overvoltages in an operational dc grid

Journal Article · Sun May 01 04:00:00 EDT 1977 · Sov. Power Eng. (Engl. Transl.); (United States)

OSTI ID:5263881

Fedorov, Yu K

Switching operations of relay windings with repeated spark flashovers of the contact gap are characterized by the presence of high frequency oscillations in the switching overvoltage curve, the amplitude rising and the frequency decreasing with opening of the contacts. High frequency oscillations may lead to resonance overvoltages in series oscillatory circuits formed by the relay winding and the capacitance to ground of the conductor connecting the relay winding with other circuit elements. The resonance overvoltages may represent a danger for semiconductor devices connected to the positive pole of the relay winding and to one of the poles of the net. On disconnection of the inductive circuit in the operational dc system, the switching overvoltages appear between the terminals of the circuit, on the switching element, and between the disconnected pole of the circuit and ground. They do not penetrate into the remaining part of the circuit.

• OSTI ID: 5263881
• Journal Information: Sov. Power Eng. (Engl. Transl.); (United States), Journal Name: Sov. Power Eng. (Engl. Transl.); (United States) Vol. 6:5; ISSN SVPEA
• Country of Publication: United States
• Language: English

Related Subjects

200302* -- Power Transmission & Distribution-- DC Systems-- (1989-)
24 POWER TRANSMISSION AND DISTRIBUTION
DC SYSTEMS
ELECTRIC GROUNDS
ELECTRICAL EQUIPMENT
EQUIPMENT
EQUIPMENT PROTECTION DEVICES
OSCILLATIONS
OVERVOLTAGE
POWER SYSTEMS
RELAYS
SEMICONDUCTOR DEVICES
SWITCHES