ABB REF615 L User Manual

GUID-90BAEB05-E8FB-4F8A-8F07-E110DD63FCCF V1 EN
Figure 453: Operate time curve based on IDMT characteristic with Minimum
operate time set to 1 second
11.3.1.1 Standard inverse-time characteristics for overvoltage protection
The operate times for the standard overvoltage IDMT curves are defined with the
coefficients A, B, C, D and E.
The inverse operate time can be calculated with the formula:
1YHT530004D05 D Section 11
General function block features
615 series 829
Technical Manual

ABB REF615 L Specifications

General

Type	Feeder Protection Relay
Rated Frequency	50/60 Hz
Weight	Approx. 1.5 kg
Communication Protocols	IEC 61850, Modbus RTU, DNP3
Protection Functions	Overcurrent, Earth fault, Thermal overload, Under/Over voltage, Under/Over frequency
Enclosure	IP20