YD-831 Microcomputer Motor Monitor and Control Protection Device

1.Asynchronous motor protection measurement and control device 2.Friendly person-computer alternation interface 3.LED display

YD-831 microcomputer  motor monito and control 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. Earthing 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

YD-831 Microcomputer Motor Monitor and Control Protection Device