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 recloser controller and remote metering |
11. | Remote programmable | Remote input support programmable |
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 |
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 |
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 recloser controller box is small, the requirement of communication rate is low, and the requirement of reliability is high.
FTU outdoor recloser controller 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.
At present, feeder terminal units power recloser controller box as one popular type of distribution electrical box have been widely deployed in column switches, ring network cabinets, switching stations, power recloser controller 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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