1.easy operation performance
2.bus grounding alarm
3.busbar over-frequency and low-frequency protection
YD-845 micro-computer based bus-bar PT monitoring & measuring device integrates monitoring, measuring and controlling functions, which can be used to detect and control the voltage transformer of power plant, substation busbar with voltage 110kV and below. It has functions of tele-control, tele-metering, tele-signaling and tele-adjusting.
Measuring and controlling function
1. II level busbar compound voltage output
2. II level busbar voltage-loss output
3. II level busbar over-voltage output
4. II level busbar PT harmonic-elimination output
5. II level busbar PT primary side wire-breaking alarm
6. II level busbar PT secondary protection side wire-breaking alarm
7. II level busbar PT secondary measurement side wire-breaking alarm
8. II level busbar low-frequency protection
9. II level busabr over-frequency protection
10. II level busbar grounding alarm
Technical parameter
Type | Name | Parameter |
Rated parameter | DC power supply | 220V or 110V |
AC voltage | 57.7V or 100V | |
AC current | 5A or 1A | |
Frequency | 50Hz | |
Power consumption
| DC current loop | ≤10W |
AC voltage loop | < 0.5VA per phase | |
AC current loop | <1VA per phase (In=5A) | |
<0.5VA per phase(In=1A) | ||
Overload capacity |
AC current loop | 2 times rated current, continuously work |
10 times rated current allowing 10s | ||
40 times rated current allowing 1s | ||
AC voltage loop | 1.1 times rated voltage, continuously work | |
DC power supply loop | 80%~110% rated voltage, continuously work | |
Work range | current | 0.05In~20In(In=5A, 10A) |
voltage | 0.4V~180V | |
frequency | 45Hz~55Hz | |
Df/dt | 0.5Hz/s~10Hz/s | |
time | 0~99.9S | |
Rated error range | current and voltage | <±3% rated value |
frequency rapid-break protection | <0.01Hz
| |
percentage differential protection | <±1% rated time+35ms | |
Protection time range
| Over-current protection | rapid-break time < 30ms at 2 times
|
Differential rapid protection | motion time < 20ms at 1.5 times rated value
| |
Percentage differential protection | <30ms at 2 times rated value; | |
Work environment
| Normal work temperature | -20°C~+50°C |
Extreme work temperature | -40°C~+70°C
| |
Relative humility | ≤95% 25°C
| |
atmosphere pressure | 80~110Kpa(below 2000m) | |
Tele-metering class | voltage, current, frequency | 0.2 class |
other elements | 0.5 class | |
tele-signaling resolution | <2ms | |
signal input way | electrical independent contact |
