The diagnosis principle and diagnosability conditions are proposed, and the normal tolerance network test nede voltage interval are given by interval iterative algorithm.
In this paper,the operation margin of mho relays(zone 3 impedance relays) is equivalently redefined as function of bus voltages instead of line impedance.
Cyclophos phamide by the current-limiting resistor R6 and voltage regulator tube VZ components, the UB voltage for the unijunction transistor VU DC power supply.
Summarize the two type's sensor of medium voltage switchgear surveillance and measuring; the protective sensor of measuring current and voltage; un-coulometer numerical values sensor.