FZY System Distributed Integrated Remote Terminal Device

Introduction

FZY-J1 distributed integrated remote terminal unit adopts distributed structure, and realizes data exchange between functional units. It adopts AC sampling technique, simplifies the design and installation of the substation. After this device won the second-class prize of the Science and Technology Progress Award of the Electric Power Ministry in 1992, the improved FZY-J2 remote terminal unit and FZY network type substation remote automation terminal were developed.

This system applies to newly created and reconstructed substations of 220kV voltage level or below.

Functions

• Adopt CAN communication network and Industrial Field Bus, have good expandability. Every basic unit is one node on the network, and is easy to expand to 110 physical I/O capacity, thus forms a distributed RTU with large capacity and flexibility.
• Every unit adopts INTEL16 bits micro-controller and AMD large scale programmable logic chip to simplify circuits, adopts multi-microcomputer distributed design to balance every CPU's load, which enhances the system's running speed and reliability.
• CAN Field Industrial Bus network is connected by twisted pair wire, easy to realize high speed communication and the real time property of data acquisition, and enhances network's reliability. When any unit in the network node broke down, it can quit automatically and doesn't influence the operation of the whole system.
• System has the self-detection function: management unit can check each node unit's running status in the system network, and each unit has the function of self-detection and fault localization.
• Each unit has serial debug interface. The debug interface adopts big screen LCD screen (240*128) and has DEBUG function, which is easy to operate and monitor. Each function unit can have internal detection function, which is convenient for operation and easy for maintenance.
• Support remote maintenance function. Company and user can realize the periodical remote maintenance by using this function to solve field problem in time and thus to greatly enhance the maintenance level of the equipment.
• Power source isolation technique: distributed power source structure, choosing the industrial power source with high reliability as the primary power source, 50Hz,AC220V and DC220V simultaneously input, AC and DC automatic switching. Because of the use of second power source isolation technique, each power module is isolated completely, thus avoids influencing each other, and restrains the disturbance caused by power source's fluctuation, greatly enhances the stability and disturbance-resistant ability of the power source system.
• The Telmering adopts dual 16 bits A/D structure, elaborately designed sampling system, and the FFT algorithm. The computation can reach to 15 harmonic. It adopts high density CT, PT signal sampling to finish the computation of power, energy, power factor, voltage, current and frequency etc, and realizes high accuracy and high reliability.
• Telemetering accuracy adopts fully digital adjustment. It automatically generates U/I's telemetering accuracy coefficient. it is easy and convenient to check.
• Swing door structure is convenient for field wire connection and maintenance.
• Adopt binary FSK to realize 300/600/1200BPS modulation, can connect with main station by optical fiber, microwave and power line carrier.
• Rich communication software interface can realize the communication with intelligent equipment such as microprocessor-based protection, microprocessor-based maloperation preventing devices and intelligent kilowatt-hour meters etc.
• Multi self-restoration function: automatic restoration after power on, software deadlock restoration and restoration by manually pressing reset button.
• Methods against thunder, static electricity, induction voltage: adopt secondary restraint technique and dedicated integrated circuit to ensure the safe operation of system equipment.

Technical Parameters

• AC analog quantum input
  Measurement lines: 12 lines/unit, can expand to 72 lines
  Measurement content: U, I, P, Q, cos, f, Wh, Wvarh
  Measurement error :U,I,P,Q 0.5%
  cos 0.25%
  f 0.01Hz
  Linear scope:0~120%, In = 5A,1A,Un = 100V
  Overload capacity: 2 times rated voltage bearing in the voltage loop, 15 times rated current bearing in the current loop, two times impulse, impulse time can last 5 seconds.
  Temperature influence: in the scope of -10 C~50, error not exceeds 0.5%
• Switch quantum input
  Capacity: 48 channels/unit, can expand to 1024 channels
  Input method: photoelectric coupling input, 24VDC/48VDC/220VDC/110VDC
  Scanning speed:2ms
• Energy pulse quantum input
  Capacity: 48 channels /unit, can expand to 128 channels
  Accumulator: 24 bits
  Input method: photoelectric coupling, 1mA driving
• Remote control output
  Controlled objects: 8 channels /unit, can expand to 128 channels
  Output method: sealed relay, auxiliary contact
  Contact capacity: DC 24V, turning-on current 5A
  Control method: return checkout
• Communication interface
  Supports CDT/Polling etc method
  Modulation method: FSK.
  Transfer speed: 300/600/1200 baud rate optional
  Center frequency, frequency offset optional
  232/485/422 multi interface mode optional
• Working environment
  operation temperature:-10~55
  Storage temperature:-20 ~75
  Humidity: < 85%(205ʱ)
  Circumstances: no explosion, no corrosive gas, conductive dust and heavy mildew existing around, no acutely vibrated impulse sources.
• Insulation resistance
  The insulation resistance of device input loop is not less than 10M by megohmmeter.
  The insulation resistance of
  the voltage input loop vs. the shell,
  the current input loop vs. the shell,
  the voltage loop vs. the current loop, and
  the device output loop vs. the shell is respectively less than 10M by megohmmeter.
• Voltage withstand test
  Test part: add 1500V voltage between power input end and the shell.
  Add 1000V voltage between strong signal input and weak signal input
  Add 1000V voltage on each voltage input loop.
  Add 500V voltage on each phase input loop
• Anti-interference test
  High frequency interference test standard:
  Producing 1MHz high frequency interference impulse, 400 times per second, lasting 30 seconds, if no component is destroyed, then the device is working stably.
  Tested Parts                             CMI test     DMI test

  power                                           500V      1000V
  switch signal input loop          1000V      500V
  AC sampling input loop              2500V      1000V

• Mean Time Between Failures (MTBF) 30000 hours

Engineering Application

So far, more than thousands sets of FZY systems have been used successfully around the nation.