Motor protection based on Singlechip
Abstract
The motor is the import portion in the auto manufacture system. Therefore,
it is important to protect the motor reliably and effectively. However, China’s
motor protection in theoretical research and manufacturing facilities overseas in
terms of relative performance is still relatively, Back ward in the protection of
low-efficiency device reliability poor, often mistaken action, motor damage in
serious condition, directly or indirectly caused by the enormous economic losses .
An based on singlechip protection equipment for the high voltage large
asynchronous motor is discussed in this article. The protection equipment is
based on over-current value, zero-phase-sequence component, negative-phase-
sequence component and other protection criterions; In Protection theory, it
realizes the intelligent fault diagnosis based on the differential motion protection
and the electric current protection; in hardware system, take the ATmega16L
MCU as the core of processor system. Use the gather simulation signal likes
voltage, electric current, temperature and so on, to transform after ADC for the
digital quantity, and then signal sends in the MCU system to process, will judge
the transformer through the processing result whether will include the
breakdown , the breakdown type, and making the appropriate action to protect.
Simultaneously, the system clot matrix liquid crystal display through an external
keyboard and peripherals, such as its real-time monitor and control. In system
software, utilizes the C language compilation software procedure, enables it to
distinguish and to process the electrical signal which transmits from the sensor,
and take the appropriate procedures to protect, then demonstrated through the
LCD.
Keywords：Motor protection，singlechip，differential motion protection ，
electrical current protection
