ATB-700 Series Microcomputer Protection Devices

Working Power supply

RS485

Modbus RTU

Operating temperature

-25℃~55℃

Storage temperature

-40℃~70℃

Operating humidity

≤90%RH，non-condensing, no corrosive air

Storage humidity

≤95%RH，non-condensing, no corrosive air

Altitude

≤2000m

Electromagnetic compatibility Performance

Electrostatic discharge

RF Field Strength
Susceptibility

Class Ⅲ（GB/T 17626.3 IEC 61000-4-3）

Electrical Fast Transient /Burst Test

Surge Test

Class IV(GB/T 17626.5 IEC 61000-4-5)

Conducted Susceptibility Test

Class Ⅲ（GB/T 17626.6 IEC 61000-4-6）

Power
Frequency Magnetic Field Susceptibility
Test

Oscillating wave immunity 

Class Ⅲ(GB/T 17626.12 IEC 61000-4-12) 

Electromagnetic emission limits

Accordant(GB/T 14598.16 IEC 60255-25)

Model

Function

ATB-765

ATB-771

ATB-772

ATB-773

ATB-790

Protect

Excessive start time protection

■

Phase-to-phase overcurrent protection

■

■

Phase to phase fixed time overcurrent protection

■

Overload protection

■

■

■

Reclosing protection

■

Acceleration protection

■

Charging protection

■

■

Negative sequence overcurrent protection

■

■

Zero-sequence overcurrent protection

■

■

■

Over-voltage protection

Low voltage protection

■

■

■

■

■

Zero-sequence overvoltage protection

Low-frequency load shedding

■

Non-power protection

■

■

Inline backup power self-recovery

■

Bridge switch self-recovery

PT break detection

■

■

telemetry

communicate

Voltage

Current

■

■

■

Active Power

■

■

■

Reactive power

■

■

■

Power Factor

■

■

■

Frequency

■

■

■

■

■

Telemetry

12

12

12

12

12

event logging

Protection Events

■

■

■

■

■

Alarm events

■

■

■

■

■

Telemeter shift events

■

■

■

■

■

Operation log events

■

■

■

■

■

Accidental shift count statistics

■

■

■

■

■

control

Remote protection throwing/returning

■

■

■

■

■

R emote Modification of setting value

■

■

■

■

Local/remote switching and closing

■

■

comm.

RS-485 communication