Means for increasing the stability in high-voltage power supply

Details Means for increasing the stability in high-voltage power supply Means for increasing the stability in high-voltage power supply

1974-12-24

1977-06-07

Miller, J D

Electricity: electrical systems and devices

Safety and protection of systems and devices

Capacitor protection

361 15, H02H 716

Patent

active

040285928

ABSTRACT:
Series capacitor blanks are inserted in high-voltage alternating current network systems in order to improve the stability of the system. Such capacitor banks are provided with a shunt-circuit for short-circuiting the capacitors if the voltage across them increases above a predetermined value at which the capacitors may be damaged or destroyed. When, in the event of a disturbance in the network, said shunt-circuit has short-circuited the capacitors, the stabilizing ability of the capacitors is gone. In order to avoid this, the capacitor bank is provided with a further shunt circuit including non-linear resistors, said resistors having a very high resistance as long as the voltage across the capacitor bank is lower than a predetermined value. Said value is higher than the noraml operating voltage of the capacitors but lower than the voltage at which the first shunt circuit short-circuits the capacitor bank. Above said predetermined value the resistance of the non-linear resistors will decrease in order to keep the voltage across the capacitor bank below the value at which said shunt circuit becomes effective.

REFERENCES:
patent: 2504860 (1950-04-01), Marbury
patent: 2569133 (1951-09-01), Podolsky
patent: 2819429 (1958-01-01), Skeats
patent: 2862152 (1958-11-01), Ryden
patent: 2878428 (1959-03-01), Bockman et al.
patent: 2900578 (1959-08-01), Marbury
"Series Capacitor Installations," By W. C. Bloomquist, 3/1945, Power Plant Engineering, pp. 94-97.

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