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  • PCS-9721A/B Distribution Terminal Unit(DTU)

  • The distribution terminal unit is the general designation for various devices, such as a feeder terminal unit and a transformer terminal unit that are being used in the distribution feeder circuits.

    PCS-9721A/B is a distribution terminal unit for switching stations, distribution rooms, and etc. With the many years of experience in such fields as relay protection devices, monitoring and control, as well as distribution automation, these products are made reliable and more advanced in technology.

    The Distribution Automation System is designed with a hierarchy of architecture, containing two layers: The first layer, the master station, is mainly used for the operation of the low and middle voltage lines, devices, as well as the users of the whole distribution network and controlling power distribution. The second layer, the distribution terminal, is for conducting data acquisition, monitoring its condition, and fault detection. It also provides treatment to the middle and low voltage lines, station switch, power distribution transformer and capacitor of the distribution network.

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Measurement and Control
  • Tele-measurement
  • Tele-signal
  • Tele-control

Fault Detection

PCS-9721A/B can detect a failed feeder to provide timely data for fault analysis on a master station. It will also perform a fault isolation in combination with the master station, breakers, and load switches, which will help play a role in restoring the distribution network, both reliably and swiftly.

  • Overcurrent fault detection.
  • Overload detection
  • Earth fault detection

Data Processing
  • Real time measurement data
    • Voltage and current
    • Power related data
    • Harmonic wave
    • Unbalance rate
    • Electric energy metering
  • Data Statistics
    The terminal can make statistics on various types of information to monitor and analyze data for the electric energy quality, metering and device management.
    Data can be from the device or collected from inputting data with an external device.
    • Voltage qualification rate
    • Extreme values and curve
    • Data per hour and curve
  • Alarm and Abnormal Monitoring
    The device will monitor the running state of a primary line in real time, conduct self-checks on the operating conditions of the terminal, and monitor the state of other intelligent devices. In case of any abnormal alarm or local warning indication, all alarms can be treated by a virtual tele-signal that will be sent to the master station/sub-station.
  • Communication management function
  • Master slave cascading
  • Submitting and modifying setting
  • Submitting fault information
  • Submitting operational warning information
  • Submitting change of Binary Input information
  • Submitting tele-measurement
  • Submitting tele-signal
  • Overall inquiry
  • Remote time synchronizing
  • Wireless communication

Power Supply

The main power supply for the device can be both AC or DC, with two-circuit power inputs for standby support. Backup power is supplied by battery. Once the AC power supply is shut off, the device will automatically switch to battery without any disturbance. Once the AC power supply is powered back on, the device will automatically switch to AC power supply mode.

During all power supply switching processes, the device will continue its normal operation. It is also provided with battery activation and maintenance, and the function can be manually engaged in a local or remote place.

  • Reliable and stable operations
    PCS-9721A/B has absorbed NR’s years of experience in R&D. This would include operational experience in relay protection, monitoring and controlling devices, communication devices, and the comprehensive automation of substations. Many different technical methods are taken into consideration. The PCS-9721A/B can withstand the poorest of weather conditions with its wide range temperature device, moisture, shock, and lightening proof, as well with its good electromagnetic compatibility, low power consumption making it a very stable unit.
  • Useful functions and capabilities
    PCS-9721A/B as a useful and comprehensive list of functions, which can be configured as needed, as it has great flexibility.
    • Measurement, control and protection
    • Integrated communication and management
    • Integrated optical fiber and Ethernet ring
    • Historic and statistical data management
    • Distribution transformer monitoring
  • Open and expandable system
    The soft and hard platform of terminals is designed with an open interface and expansion acceptability which makes it easier for future growth and upgrading. It also ensures a longer and more effective service life.
    • Unified slot for various cards to achieve high compatibility It enables the easy access of a new function in card.
    • Each Function is designed to implement by independen software module which provides a standard software interface for future upgrading and expansion.
    • The communication management function is integrated in the device. It is constructed by the configuration tool. Communication protocol utilizes modular design for easy expandability.. IED can integrate openly.
  • Convenient and safe maintenance.
    • With a large memory capacity, the terminal can save large amounts of data and statistics for future inquiries.
    • Data can be saved over long-term power outages, which ensures the safety of very important data.
    • Commissioning and maintenance can be accessed locally or logged in remotely via telnet. The interface can be Ethernet, serial ports, or wireless by GPRS, and so on.