Sigma Laboratory Tec. is the leading comprehensive testing institution in the United Kingdom, with testing capabilities covering capacitors, insulators, and arresters. Its main testing scope includes power capacitors, HV shunt capacitor devices, HV post insulators, insulating bushings, metal oxide surge arresters without gaps for A.C. systems, and valve arresters, etc.
Capacitor testing capacity---5000 kvar
Insulator mechanical crankle test---torsional load 30kN·m, bending load 150kN·m
Arrester Test—550kV and below all items
Impulse current test—8/20μs
Lightning impulse 200kA, 30/80μs
Switching impulse 20kA,18/40μs
Switching impulse 15kA, 4/10μs
High current impulse 1501 kA 2ms square wave 3kA
