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YD-831 Micro-computer Based Monitoring Motor Protection Relay Device
YD-831 Micro-computer Based Monitoring Motor Protection Relay Device

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Quality/Safety Certification: 0.00


1.IEC225-22-4 standard.
2.Under voltage protection relay,over voltage protection relay,over current protection relay.

     YD-831 micro-computer based motor monitoring and controlling protective device integrates protecting, measuring and controlling, which is used to protect small type motor with voltage 3 to10kV. It has functions of tele-control, tele-metering, tele-signaling and tele-adjusting.

Measuring and controlling function

1. Short-circuit and long-running protection or blockage protection

2. Unbalanced protection (including open phase and inverse phase):

two-stage definite negative sequence overcurrent protection, one-stage negative sequence overload alarm, two-stage negative overcurrent inverse time protection;

3. Over-load protection

4. Over-heat protection: including over-hot alarm and over-heat trip, has functions of thermal-image and restart-forbidden, capable of real-time displaying the heat accumulation of motor

5. Under-load protection

6. Grounding protection: zero sequence over-current protection/sensitive current grounding wire selection,

zero-sequence over-voltage protection

7. Low-voltage protection and automatic start control

8. Over-voltage protection

9. Three circuit non electric quantityprotection (capable of selecting tripping or warning/alarm)

10.8 sets of non-electric protection (capable of selecting tripping or warning/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

 

 

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