TCT type controllable reactor control winding interturn fault protection method

• Main Authors: YUAN XIAODONG, JIN YING, ZHENG TAO, LIU YANG, GAI ZHENYU, ZHANG FENFEN, SHI MINGMING, LIU LIANGUANG
• Format: Patent
• Language: English
• Published: 09.09.2015
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION

The invention discloses a TCT type controllable reactor control winding interturn fault protection method, belonging to the electric power system relay protection technology. When a TCT type controllable reactor line side zero sequence voltage 3U0 is less than a setting valve Uset, zero sequence over-current protection is started or else a zero sequence voltage is blocked; in case of control winding interturn faults, if a TCT type controllable reactor is in a capacity constant state, when the zero sequence current fundamental component 3I0 of the control winding is greater than the low constant value high sensitivity protection I segment setting valve Iset1 of zero sequence over-current protection, a tripping command of zero sequence over-current protection is outputted; in a capacity wide range adjustment transient state, when the 3I0 is greater than the high constant value low sensitivity protection II segment setting valve Iset2 of zero sequence over-current protection, a tripping command of zero sequence over-current protection is outputted. The method is provided with zero sequence voltage closedown, employs a two-segment type setting method, and has high reliability and safety, and real engineering application significance.