Protective Elements
The directional decision depends on the layout of the mains star-point or the angle between residual voltage and
ground current. The residual voltage can be measured via suitable transformers (da-dn winding – formerly: e-n) or
can be calculated, provided the VTs are in star-connection.
The earth current can be measured either directly via a cable-type transformer or detected by a Holmgreen
connection. The earth current can alternatively be calculated from the phase currents; but this is only possible if the
phase currents are not ascertained by a V-connection.
The device can optionally be procured with a sensitive earth current measuring input (in preparation).
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MRI4
DOK-HB-MRI4-2E
Содержание highprotec MRI4
Страница 1: ...Manual Feeder Protection MRI4 Software Version 3 4 a DOK HB MRI4 2E Revision C English...
Страница 43: ...Installation and Connection 43 MRI4 DOK HB MRI4 2E...
Страница 46: ...Installation and Connection Ensure the correct tightening torques 46 MRI4 DOK HB MRI4 2E...
Страница 56: ...Installation and Connection Ethernet RJ45 Terminals 56 MRI4 DOK HB MRI4 2E 1 8 TxD TxD RxD n c n c RxD n c n c...
Страница 69: ...Navigation Operation Navigation Operation 69 MRI4 DOK HB MRI4 2E 1 2 3 5 7 6 8 10 9...
Страница 353: ...Device Parameters 353 MRI4 DOK HB MRI4 2E...
Страница 373: ...373 MRI4 DOK HB MRI4 2E...