ABB REF615 L User Manual

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k A
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U U
U
C
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GUID-6E9DC0FE-7457-4317-9480-8CCC6D63AB35 V2 EN (Equation 105)
t [s] operate time in seconds
U measured voltage
U> the set value of Start value
k the set value of Time multiplier
Table 661: Curve coefficients for the standard overvoltage IDMT curves
Curve name A B C D E
(17) Inverse Curve A 1 1 0 0 1
(18) Inverse Curve B 480 32 0.5 0.035 2
(19) Inverse Curve C 480 32 0.5 0.035 3
Section 11 1YHT530004D05 D
General function block features
830 615 series
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