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YD-870 Mirco-computer Based Transformer Differential Protecting Device
YD-870 Mirco-computer Based Transformer Differential Protecting Device

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Quality/Safety Certification: 0.00


1. support DL/T667-1999(IEC 60870-5-103) protocol
2. LED display

     YD-870 micro-computer based transformer differential protection device integrates protecting, measuring and controlling, which can be used to measure and control the differential protection and low-voltage side for two windings of transformer with voltage 110kV and below. It has functions of tele-control, tele-metering, tele-signaling and tele-adjusting.

Measuring and controlling protection

Differential quick-break protection

Ratio-differential protection (based on secondary harmonic principle)

Four level direction over-current protection with re-pressing lock (sharing low-voltage side differential CT)

CT line-breaking judgment

Overload alarm

8 sets of protective setting group

 

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

 

 

 

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