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Key functions of Control Box


S/N

Functions

Remarks

1.

Three section protection

Each protection can be vote back independently

2.

Over-current count protection

Failure time count, output after meeting the number of

times, output mode is optional

3.

Zero-sequence protection

Output options: exit, alarm and tripping

4.

Pre - voltage fault protection

Protection can be accelerated when combined at fault

point

5.

Post-reclosing acceleration

Vote back independently

6.

Constant time-lag

The protection time is fixed

7.

Inverse time limit

Multiple protection curves optional

8.

Ring network protection

Hardware needs to configure double PT

9.

Event Log

The recording time is exactly millisecond

10.

Status enquiry

The main content is remote control and remote

metering

11.

Remote programmable

Remote input support programmable


Communication protocols of Control Box


S/N

Protocols

Remarks

1.

IEC60870-5-101 balanced


2.

IEC60870-5-101 unbalanced


3.

IEC60870-5-104


4.

DNP3.0

Now support level 3

5.

Modbus



Technical Parameters of Control Box


No.

Items

Rated value

Remarks

1.

Operating ambient temperature

-40 ~ +85℃


2.

Environmental relative humidity

10 ~ 100%


3.

Maximum absolute humidity

35g/m3


4.

Atmospheric pressure

66~ 108kPa


5.

Working voltage

AC220V±20%


6.

Working voltage frequency

50HZ±5HZ


7.

Power consumption

≤15W


8.

Protective exit time

<35ms

Protect inherent action time at 1.5 times fixed value

9.

Insulation impedance

>100MΩ/ DC500V

1. External terminal to ground

2. Power circuit to ground

3. On-off input circuit to ground

4. Output circuit to ground

5. AC circuit to ground

6. AC circuit and power circuit

7. Between on-off input circuit and output circuit

10.

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

11.

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




Characteristic functions of Feeder Terminal Unit

FTU is small in size and large in quantity. It can be placed on an electronic control box. It is equipped with a transmitter for direct AC sampling. It is resistant to high temperature and cold and is suitable for outdoor harsh environments.


The amount of data collected by FTU is small, the requirement of communication rate is low, and the requirement of reliability is high.


FTU 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.


Application of Feeder Terminal Unit

At present, feeder terminal units 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 it 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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