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HOME ⊙ ABB ⊙ ABB RELION ® 615 series REU615 voltage protection and control relay
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ABB RELION ® 615 series REU615 voltage protection and control relay

来源: | 作者:FAN | 发布时间 :2025-07-08 | 186 次浏览: | Share:

Actual accuracy limit coefficient calculation: The actual accuracy limit coefficient (F a) is related to the rated accuracy limit coefficient (F n), CT rated load (S n), CT internal secondary load (S in), and actual external load (S). The calculation formula is:

F a ≈ F n × ∣ S n+S ∣∣ S in+S n ∣ CT selection principle: For non directional overcurrent protection, it is recommended to choose a CT with an actual accuracy limit factor of at least 20. The rated primary current (I 1n) of the CT should meet the requirement of I 1n>I kmax/100 (I kmax is the maximum fault current) to avoid exceeding the thermal and dynamic intensity of the input current measurement of the protective relay.

Suggestion for starting current setting: If I kmin is the lowest current that should be activated during the highest set overcurrent stage, the starting current should be set to:

The current starting value, with a coefficient of 0.7, takes into account protection relay error, CT error, and short-circuit calculation deviation.


2、 Input parameters

（1） Incentive input

Phase current (configuration B)

Terminals: X120:7-8 (IL1), X120:9-10 (IL2), X120:11-12 (IL3)

Can be used for single-phase or two-phase applications, where some excitation inputs can be left vacant, but at least X120:7-8 needs to be connected

Residual current (configuration B)

Terminal: X120:13-14 (Io)

Phase voltage (configuration B)

Terminals: X120:1-2 (U1), X120:3-4 (U2), X120:5-6 (U3)

Phase voltage (configuration A)

Terminals: X130:11-12 (U1), X130:13-14 (U2), X130:15-16 (U3)

SECRSYN1 reference voltage (configuration A)

Terminal: X130:9-10 (U12B)

Residual voltage (configuration A)

Terminal: X130:17-18 (Uo)

（2） RTD/mA input (configuration B optional)

Terminals and corresponding functions:

X130:1-2：mA1（AI1）

X130:3-4：mA2（AI2）

X130:5-6：RTD1（AI3）

X130:7-8：RTD2（AI4）

X130:9-10：RTD3（AI5）

X130:11: RTD channels 1-3 common ground

X130:12: RTD channels 4-6 common ground

X130:13-14：RTD4（AI6）

X130:15-16：RTD5（AI7）

X130:17-18：RTD6（AI8）


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