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(2) The work principle of electric power press brakes based on transducer was given. As a result of the wide practicality of the press brake, a control system based on electromotion was developed.

(3) MA Hui. Digital substation technical books - design book [ M ]. Beijing: China electric power press, 2010.

(4) WANG Wei - jian . Principle and Application of Main Electrical Equipment Relay Protection. Beijing: China Power Press, 1996.

(5) WANG Xi fan . Base of Power System Planning. Beijing: Hydraulic and Electric Power Press, 1994.

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(10) Products: press brake machine, shearing machine, three roller bending machine, power press machine...

(11) HU Jing - sheng . Transformer Economic Operation. Beijing: China Power Press, 1999.

(12) HE Jiali, SONG Congju. Protective relaying theory of power system. Beijing: China Power Press, 2004.

(13) WANG Wei - jian . Application of Relay Protection on Generator and Transformer. Beijing: China Electric Power Press, 2004.

(14) XIAO Xiang - ning. Analysis and control of power quality [ M ]. Beijing: China Power Press, 2004.

(15) WANG Wei - jian . Principle and Application of Electric Main Equipment Relay Protection. Beijing: China Power Press, 1998.

(16) CHEN Deshu . Principle and technology of microprocessor - based protection. Beijing: China Power Press, 1994.

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