Safe and reliable phase comparators
January 2011
Electrical Power & Protection
Dehn’s PHV phase comparators, available from Surgetek, are two-pole devices that offer safe and reliable operation while testing for in-phase conditions in three-phase electrical systems. They are suitable for voltages up to 36 kV/50 Hz, have SABS approval and meet the requirements of IEC 6148 standards.
The PHV phase comparator has distinctive red rings on both test prods that mark the end of the insulating sections in the direction of the operating head/indicator. It represents a visible limit of contact with live and earthed system parts, as well as the depth of penetration allowed into electrical systems. The type PHV is suitable for use in indoor and outdoor systems, but not in wet conditions.
The eccentric mounting of the indication ensures good visibility from various angles, and provides for an out-of-phase condition when the phase angle between the two parts of the system to be tested is between 60° and 300°. A clear and sharp threshold is provided and the indication remains at a constant frequency over the testing range. Used in contact with the parts to be tested, the PHV phase comparator is insensitive to magnetic and electrical interference.
Various colour coded test prods are available for select voltages with a simple bayonet connection that ensures easy coupling to the test unit. Compact prods are ideal for use in areas where space is limited, while the standard versions are suited for areas where larger span and separation is required. Test prods with a 90° angle are available for testing in switchgear where the axis of the bushing is mounted in a vertical plane.
For more information contact John van Staaden, Surgetek, +27 (0)11 792 1303, [email protected], www.surgetek.co.za
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