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KSO-203

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Single-sided service assembled chambers of KSO-203 series

Single-sided service assembled chambers of KSO-203 series (hereinafter KSO) for rated voltage of 6 and 10 kV three-phase AC at 50 Hz are designed for switchgears with isolated or arc-suppression reactor grounded neutral.

KSO chambers have a number of advantages:

increased operational reliability due to the use of modern high-voltage vacuum circuit breakers with high mechanical and switching endurance;
capability of implementing relay protection using multifunctional, compact, highly reliable microprocessor units from leading global manufacturers;
enhanced operational safety due to the use of more reliable interlocks of high-voltage switching devices against erroneous actions of substation personnel during switching and repair operations.

KSO chambers with vacuum circuit breakers are used in indoor switchgears and electrical installations with frequent switching operations.

Parameter / Description	Value / Rating
Technical specifications of KSO chambers
Rated line voltage, kV	6; 10
Busbar rated current, A	up to 1250
Rated current of KSO main chamber circuits, A	630 - 1250¹
Rated current of main circuits with load switches, voltage transformers, power transformers, and fuses, A	630
Rated breaking current of main chamber switching devices: - vacuum circuit breakers, kA; - load switches, kA	20,0; 31,5²10,0²
Thermal withstand current (3 sec), kA	25,0³
Rated electrodynamic withstand current of main circuits (peak), kA	51,0³
Rated voltage of secondary circuits, И	220 220
Insulation type	Air
Connection type	Cable or busbar
Maintenance conditions	Single-sided
Degree of enclosure protection according to GOST 14254	IР30 - with closed upper and lower chamber doors from the front; IР00 - with open doors and from the rear side.

¹KSO chambers for rated current of 1250 A are custom-manufactured only.
²According to the technical specifications of the circuit breakers;
³Thermal and electrodynamic withstand of current transformers according to their technical parameters.