ACS-2012 Digital Automatic Control And Measuring System

Mode: ACS-2010
Structure: PLC control
  1. System Introduction
  1.1 The control table will be connected with its switch cabinet through optical fiber so as to isolate
  the main system equipment from the control unit and prove safety control of the system.
  1.2 The key components and control panel are used of high quality imported parts.
  1.3 Touch screen for control, program writing, and software update is available.
  1.4 With functions of control, measurement, protection and interlocks, and can realize
  automatically control.
  2. Main Structure of System
  The system is composed by operating interface and PLC control unit.
  2.1 The operating interface is mounted on the control table which is located in control room. So
  that the testing transformer can be controlled at site acc. To different test requirements, data of control
  and measurement will be transmitted via 2-core optical fiber.
  2.2 The PLC control unit is mounted at switch cabinet side which connected with the interface via
  2-core optical fiber.

  3. System Functions:
  3.1 Separated sub-interface for different control of the transformer.
  3.3 Emergency stop buttons of each interface are available for cut off power supply of the system
  and shut down the test. The functions can be set and operated through touch screen.
  3.4 Control Functions:
Open/Close of Primary side of the regulator;
  Open/Close of Secondary side of the regulator;
  Step-up/Step-down;
  Step-up time setting;
  Step-down time setting;
  Speed Adjustable(by 3-phase AC Motor);
  Setting of Timer;
  Turn Ratio Setting of the Divider;
  Setting of Current Protection Value;
  Setting of Voltage Protection Value;
  Reset of Protection State;
  Operation of Alarming Bell & Lights;
  Timing Operation: timing will be driven automatically after push down start button. When arrived
  the setting time point, the alarming will start and keep for 2 min, then the system will step down.
  Automatic Control: Preset of voltage value, step-up/step-down speed and timing data, then push
  down start button for realizing of the whole process.
  3.5 Measurement Display
  Secondary voltage of regulator (i.e. Primary winding voltage of testing transformer) : accuracy 1%
  Secondary current of regulator (i.e. Primary winding current of testing transformer) : accuracy 1%
  Voltage of Divider (i.e. Secondary winding voltage of testing transformer): accuracy 1%
  Secondary winding current of testing transformer: accuracy 1%
  The high voltage value of discharge can be recorded.
  3.6 State Display and Indication:
  Correctness of phase sequence;
  Close or open state indication of regulator primary switch;
  Close or open state indication of regulator secondary switch;
  Position Limit indication of regulator step-up / step-down;
  Over-voltage Protection;
  Over-current Protection;
  Protective device action of switch cabinet;
  Interlock/Indication between test field door and switch-on operation;
  Interlock/Indication of non-release of emergency button;
  Interlock/Indication of operation when the regulator set not at lowest position;
  The reactor is stepless adjustable unit and controlled manually of the motor for adjustment of
air-gap. The relevant current value will be indicated and with showing of capacitive current
  compensated.
  3.7 Interlock:
  Interlock of isolating switch ON and vacuum circuit breaker ON;
  Interlock of vacuum circuit breaker OFF and isolating switch OFF;
  Interlock of vacuum circuit breaker Close and failure set lowest position of regulator;
  Test field door opened, vacuum circuit breaker cannot be closed;
  Emergency stop button not released, vacuum circuit breaker cannot be closed;
  Circuit breaker closed, tripping off automatically when the door opened;
  Only regulator primary closed first, the secondary can be closed;
  When the primary tripped off, the secondary do same action automatically;
  Circuit breaker tripped off, the regulator will go down to the lowest position;
  When the regulator is live, if the control power suddenly cut off, the vacuum breaker will trip off.
  After the system be switched on again, the regulator will return to Zero Limit Position. Otherwise, the
  breaker could not be turned on again.
  In test process, if test object is breakdown, overcurrent protection will act and the front pole switch
  and rear pole circuit breaker will trip off and the regulator will return to Zero Position. Otherwise, the
  close operation of front pole switch and vacuum breaker cannot be carried out.
  3.8 Protection
  The switch cabinet has current and voltage protection components which separated away from the
  control system. When set protection value reached, the protective actions work accordingly and its
  action will be indicated on the interface of control system.
  The current protective value of regulator primary and secondary can be set through control system.
  When the set value reached, the system trip off automatically.
  Control Functions: Change-over between auto and manual control as per operator order input.
  Close /open of switch is under control; automatic step-up / step-down and emergency open while being
  failure; the speed of step-up can be controlled automatically, that means high speed of step-up is done before 75% test voltage and the speed slow down beyond 75% test voltage.

Principle Diagram: