Control Box-Feeder Terminal Unit

The feeder terminal unit(FTU) is a new HV switch control device of control cabinet enclosures equipped with both the imported DSP high-speed sampling chips and the high-performance ARM chips, and can fast and stably finish the monitoring on the switch.

Industrial feeder terminal unitby our electric power equipment company has such functions as the protection, measuring, controlling, monitoring, communication, remote control, and so on and features high integration level, flexible configuration, and user-friendly interface. Electrical control cabinet are widely applied to the radiant and ring network power supply systems.

FTU outdoor control electrical control box can help the systems identify transient and permanent line faults. Outdoor electrical control boxeliminate the impact of transient line faults automatically, isolate the permanent fault segments to avoid prolonged power failure in a large area, and automatically recover the power supply in fault-free areas, so as to realize the automation of power distribution network in an economical and practical way.

Control Box-feeder Remote Terminal Unit Key Functions

S/N	Functions	Remarks
	Three section protection	Each protection can be vote back independently
	Over-current count protection	Failure time count, output after meeting the number of times, output mode is optional
	Zero-sequence protection	Output options: exit, alarm and tripping
	Pre - voltage fault protection	Protection can be accelerated when combined at fault point
	Post-reclosing acceleration	Vote back independently
	Constant time-lag	The protection time is fixed
	Inverse time limit	Multiple protection curves optional
	Ring network protection	Hardware needs to configure double PT
	Event Log	The recording time is exactly millisecond
	Status enquiry	The main content is remote control and remote metering
	Remote programmable	Remote input support programmable

Control Box-Feeder Terminal Unit Communication Protocols

S/N	Protocols	Remarks
	IEC balanced
	IEC unbalanced
	IEC
		Now support level 3
	Modbus

Control Box-feeder Remote Terminal Unit Technical Parameters

	Items	Rated value	Remarks
	Operating ambient temperature	-40 ~ +85℃
	Environmental relative humidity	10 ~ 100%
	Maximum absolute humidity	35g/m3
	Atmospheric pressure	66~ 108kPa
	Working voltage	AC220V±20%
	Working voltage frequency	50HZ±5HZ
	Power consumption	≤15W
	Protective exit time	<35ms	Protect inherent action time at 1.5 times fixed value
	Insulation impedance	>100MΩ/ DC500V
	Power frequency withstand voltage	2k	Power circuit to ground
		500	On-off input circuit to ground
		500	Output circuit to ground
		2k	AC circuit to ground
		2k	AC circuit and power circuit
		1500	Between on-off input circuit and output circuit
	Impulse withstand voltage	5k	Power circuit to ground
		1k	On-off input circuit to ground
		1k	Output circuit to ground
		5k	AC circuit to ground
		5k	AC circuit and power circuit
		1k	Between on-off input circuit and output circuit

Control Box-feeder Remote Terminal Unit Characteristic Functions

Feeder terminal unit is small in size and large in quantity. FTU electrical control cabinet is equipped with a transmitter for direct AC sampling. It is resistant to high temperature and cold and is suitable for outdoor harsh environments.

Unlike the scada remote terminal unit, the amount of data collected by FTU electronic control box is small, the requirement of communication rate is low, and the requirement of reliability is high.

FTU outdoor control box can be manufactured by a high-performance single-chip microcomputer. In order to adapt to the harsh environment, industrial chips that can work at 75 ℃ shall be selected, and they shall be protected against lightning, rain and moisture through appropriate structural design.

Control Box-feeder Remote Terminal Unit Application

At present, feeder terminal units power control box as one popular type of distribution electrical box have been widely deployed in column switches, ring network cabinets, switching stations, power control boxes, and other places on the distribution network line to realize the "three remote" automation functions of remote signaling, telemetry and remote control of remote primary equipment.

As an information and data communication tool, a computer network provides a powerful communication means for industrial electrical cabinet and provides a reliable basis for realizing the networked control of distribution automation system devices. Fieldbus technology and GPRS wireless communication technology inject new vitality into the implementation of feed automation. Driven by network, communication and other information technologies, distribution automation is developing from spontaneous Island automation to unified and systematic comprehensive automation.

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