YD-800 Micocomputer Line Monitor Control Protection Device

1. Digital Line Protection Devices, 2. Digital lineprotection,automation system, 3. Industrial control systems.

Description

The YD-800 line monitor and control protection device integrates protecting, measuring and controlling functions, it  is suitable for 110kV or below line protection which is non-direct earthing or through small resistance earthing system. It has functions of tele-control, tele-metering, tele-signaling and tele-adjusting.

Protection function

1. 3-stage over-current protection with repressing block

2. s-stage zero sequence over-current protection

3. One-stage sensitive current earthing line selection

4. One-stage fifth harmonics  zero sequence power directional protection

5. Three-phase secondary recloser (synchronism check, no voltage or no check)

6. Over-load protection

7. Inverse-time over-current protection for three characteristics protection

8. Low frequency load-reducing protection

9. Low voltage load-reducing protection

10. Over-voltage protection

11. Low voltage protection

12. 3 circuits non-electric quantity protection (capable of tripping or warning)

13. Manual and automatic synchronizing switching operation

14. 8 events recording.

YD-800 Micocomputer Line Monitor Control Protection Device