Asea Brown Boveri Ab

Abb Technology Ag

Abb Research Ltd.

Abb Ab

Lars Paulsson

Lennart Angquist

Ake Petersson

Bjorn Thordvaldsson

Ola Jeppsson

Per Halvarsson

Rutger Johansson

A device for quick closing of an electric circuit having a main spark gap with main electrodes and a triggering device. The triggering device has an auxiliary spark gap with auxiliary electrodes for igniting an arc in the main spark gap. The auxiliary electrodes are shielded from the main spark gap by a shielding unit having channel means extending therethrough from an auxiliary spark gap facing side to a main spark gap facing side of the shielding unit. The device further includes a nozzle with a first end being most close to the auxiliary spark gap and a second end most close to the main spark gap. The first end has an inlet opening that is in connection with the channel means and the second end has an outlet opening. The invention also relates to a corresponding method and to a use of the device.

Device and method for quick closing of an electric circuit and a use of the device

A one-phase static var compensator apparatus includes a compensator string consisting of a first static var compensator connected serially to a thyristor valve. The compensator string is arranged to be connected on its first end to one phase of a transmission grid of a rated voltage exceeding 69 kV. Moreover, the thyristor valve includes a plurality of thyristors connected serially and the compensator string is arranged to be directly connected to the transmission grid. A corresponding three phase apparatus is also presented.

Static var compensator apparatus

A device for quick closing of an electric high-voltage circuit. A main spark gap is provided with a first and a second main electrode, and a triggering device. The triggering device includes an auxiliary electrode gap provided with a first and a second auxiliary electrode and is adapted, where necessary, to generate an arc in the auxiliary spark gap for igniting an arc in the main spark gap. Each auxiliary electrode is provided with a guide rail designed such that the arc, via the guide rails and under the influence of the generated inherent magnetic field, moves into the main spark gap. The two guide rails each have a length that is larger than the width of the auxiliary spark gap. The auxiliary electrodes are adapted so as to be protected from the effect of plasma formed in the main spark gap. A hermetic enclosure encloses the main spark gap and the auxiliary spark gap.

Device and method for triggering a spark gap

Electric arc-furnace stabilization using voltage pulse injection

Overvoltage protection for series capacitor equipment

Series capacitor equipment for distribution networks has a capacitor, voltage-dependent resistors as over-voltage protective means for the capacitor, a mechanical high-speed circuit-closer and a switch connected in parallel with the high-speed circuit-closer, for bypassing the equipment. At an overcurrent in the power line, tripping members initiate closing of the high-speed circuit-closer, which closes rapidly sufficient to protect the resistors against overload, and of the switch, which relieves the high-speed circuit-closer. The high-speed circuit-closer, the switch and the tripping members are mounted in a grounded cubicle.

Series capacitor equipment

Series capacitor equipment is connected into an electric power transmission line (L) and has a capacitor bank with a first part (CO) series-connected with a second part (C1-Cn) with variable capacitance. For protection against overvoltages, a first spark gap protective means (GO, T, TE) is connected across the first part, and a second spark gap protective means, connected in series with said first spark gap protective means, is connected across the second part of the bank. The point of connection (A) of the spark gap protective means is connected to the point of connection (B) of the bank parts through a resistor (R). The first spark gap protection means is adapted to be ignited at a predeternined level of the current in the power transmission line, the voltage drop across the resistor (R) then causing said second spark protective means (G) to become ignited.

The reactance of series capacitor equipment connected to an electrical transmission power line can be changed during operation with the aid of a transformer on-load tap-changer which switches in or out a variable number of capacitor modules. The tap-changer comprises a tap selector, the contacts of which in currentless state can be moved between the capacitor steps, and a diverter switch with a plurality of sequentially operating contact members and with resistors arranged to prevent direct short-circuiting of the capacitor steps. The tap-changer can be at line potential and operated remotely by contact-moving means at ground potential.

Growing community of inventors

Vittsjo, Sweden

Lars Paulsson