VTIS can comprehensively protect the key factors that reduce the reliability of the secondary control power supply for circuit breakers, such as voltage fluctuations, interference, lightning overvoltage, short-term power loss, etc., which can cause the control system to fail to operate normally, thereby avoiding shutdown or damage to the primary system or equipment caused by the above reasons.
VTIS consists of a parallel oscillation control module and a series interference suppression module. The series interference suppression module operates in a long-term mode and always maintains a continuous working state. When the secondary control power supply or circuit breaker secondary circuit is subjected to multiple interferences such as lightning overvoltage, ground potential counterattack overvoltage, operation overvoltage, resonance overvoltage, voltage transient, harmonic, high-frequency interference, etc., it can effectively suppress and protect the reliable and safe operation of the secondary system.