YUAN Xu-long 1, WANG Lin-hu 2. Development of Self-adaptive Electric Relay Protection for Big/Middle Model Electromotor[J]. High voltageapparatus, 2004, (4): 304-306.
YUAN Xu-long 1, WANG Lin-hu 2. Development of Self-adaptive Electric Relay Protection for Big/Middle Model Electromotor[J]. High voltageapparatus, 2004, (4): 304-306.DOI:
The configuration and its features are described in this paper.The immunity to electromagnetic interference is considered from the aspects of hardware and software.Taking CAN bus with multi-master and redundant system and RS-485protocol for communication can meet various requiremeats of applications.Taking self-adaptive principle for differential protection
instantaneous trip protection and over-current protection can adapt the device to tremendous change of operation modes of the motor.Using software to measure frequency simplifies the hardware circuit.Using stable-point sampling improves the accuracy of calculation.The prototype is tested