What problems may be caused by excessive secondary load of current transformer?

1. Increased measurement error: If the secondary load of current transformer is too large, the secondary current will be reduced, resulting in increased measurement error. This may affect the monitoring and control of power system, leading to misjudgment and misoperation.
2. Protection device refusal or misoperation: If the secondary load of current transformer is too large, the secondary current will be reduced, resulting in refusal or misoperation of protection device. This may affect the safety and reliability of power system, leading to equipment damage and power outage.
3. Core overheating: If the secondary load of current transformer is too large, the core magnetic flux density will increase, resulting in core overheating. This may accelerate the aging of core, reduce the service life of current transformer, and even cause core damage.
4. Insulation aging: If the secondary load of current transformer is too large, the core magnetic flux density will increase, resulting in insulation aging. This may reduce the insulation performance of current transformer, increase the risk of insulation breakdown, and even cause damage to current transformer.
5. Increased voltage drop in secondary circuit: If the secondary load of current transformer is too large, the voltage drop in secondary circuit will increase. This may affect the normal operation of the secondary circuit, resulting in increased measurement errors and protection device refusal or malfunction.
6. Reduced system stability: If the secondary load of the current transformer is too large, the damping of the system will be reduced, resulting in reduced system stability. This may cause problems such as system oscillation and voltage collapse, affecting the safe and stable operation of the power system.