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FTU (Feeder Terminal Unit) - FTU 2000

Introduction

The concept of FTU 2000 is a feeder Terminal Unit based on the microprocessor. In the distribution automation system, FTU 2000 acts to monitor the status of I/O point, to collect and to process digital and analog data at site. When FTU receives execute command, and then transmit the data and accept the control command to do the "Check-Before-Execution" to confirm the proper and safety of system control.

If an event is happening, the FTU can detect the error and present a malfunction flag. The SCADA system can collect the status of each I/O point of FTU to automatically monitor the entire feeder network.

FTU 2000 is designed with the microprocessor technology, which is equipped of plug-in I/O cards with the capability in communication and easy for expansion of I/O point.

The casing of FTU 2000 is made of 2.5mm stainless steel with heat insulation board to block out the sun to prevent over heat inside of the case. FTU uses the standard 3U 84T/63T/42T rack and charger for simple maintenance.

The FTU is uses the waterproof connector (MIL-C-5015) for the exterior cable connection and the case meets the IP66 (NEMA 4X) standards. As for the interior connections, the FTU support with conversion terminal that is simple for wiring and maintenance.

FTU comes in 4 types-2 way, 4way, overhead and capacitor to use for different requirements. FTU is supports with Ladder Diagram to perform the programmable algorithm function. For the SOE report, the FTU can have the dpi up to 1ms and time error between + 4ms.

FTU 2000 System Diagram

Overview

There are 4 units for the hardware of FTU, which are Main Control unit, Measurement Unit, Communication unit, and Power unit.

• Main Control unit : The FTU uses DTU 2000 as primary control unit with the features of communication integration, analog input, analog output, digital input and digital output. This unit can collects data from power measurement module or other IED.
• Measurement unit : The FTU 2000 is using the HC6740 power transducer, which offers accuracy up to 0.25% to measure voltage, current, energy and further for more than 90 parameters. HC 6740 is capable to detect the failure current and wave, the difference of voltage / phase angle between both sides of main line. The FTU has the CT circuit auto shortage protection to prevent CT circuit open.
• Communication unit : The FTU is able to collect with cable modem, optical fiber communication module, and GPRS / VHF wireless communication module. The FTU has the sufficient space for installation.
• Power unit : The FTU 2000 offers a temperature compensated type charger, which supplies the power (80~260 VAC, 50/60 Hz) for FTU itself. If the break down of AC power happens, the FTU will automatically switch to the charger for supplying the power. The charger will cut off the load when the power of charger is lower than the DC 20V to avoid over discharge electricity and extend the life of charger.