Appendix 2: Sepam voltage input connection diagrams

Sepam series 20

The phase and residual voltage transformer secondary circuits are connected to the connector B (CCT640) on Sepam series 20 protection relays according to one of the following connection diagrams.

Variant 1: measurement of 3 phase-to-neutral voltages (standard connection)

Parameters

Voltages measured by VTs	V1, V2, V3
Residual voltage	Sum of 3Vs

Functions available

Voltages measured	V1, V2, V3
Values calculated	U21, U32, U13, V0, Vd, f
Measurements available	All
Protection functions available (according to type of Sepam)	All

Variant 2: measurement of 3 phase-to-neutral voltages and residual voltage

Parameters

Voltages measured by VTs	V1, V2, V3
Residual voltage	Sum of 3 Vs

Functions available

Voltages measured	V1, V2, V3, V0
Values calculated	U21, U32, U13, Vd, f
Measurements available	All
Protection functions available (according to type of Sepam)	All

Variant 3: measurement of 2 phase-to-phase voltages

Parameters

Voltages measured by VTs	U21, U32
Residual voltage	None

Functions available

Voltages measured	U21, U32
Values calculated	U13, Vd, f
Measurements available	U21, U32, U13, Vd, f
Protection functions available (according to type of Sepam)	All except ANSI 59N, 27S

Variant 4: measurement of 1 phase-to-phase voltage and residual voltage

Parameters

Voltages measured by VTs	U21
Residual voltage	External VT

Functions available

Voltages measured	U21, V0
Values calculated	f
Measurements available	U21, V0, f
Protection functions available (according to type of Sepam)	All except ANSI 47, 27D, 27S

Variant 5: measurement of 1 phase-to-phase voltage

Parameters

Voltages measured by VTs	U21
Residual voltage	None

Functions available

Voltages measured	U21
Values calculated	f
Measurements available	U21, f
Protection functions available (according to type of Sepam)	All except ANSI 47, 27D, 59N, 27S

Sepam series 40

The phase and residual voltage transformer secondary circuits are connected directly to the connector E (CCA626/CCA627) on Sepam series 40 protection relay according to one of the following connection schemes.

Variant 1: measurement of 3 phase-to-neutral voltages (standard connection)

Parameters

Voltages measured by VTs	V1, V2, V3
Residual voltage	None

Functions available

Voltages measured	V1, V2, V3
Values calculated	U21, U32, U13, V0, Vd, Vi, f
Measurements available	All
Protection functions available (according to type of Sepam)	All

Variant 2: measurement of 2 phase-to-phase voltages and residual voltage

Parameters

Voltages measured by VTs	U21, U32
Residual voltage	External VT

Functions available

Voltages measured	U21, U32, V0
Values calculated	U13, V1, V2, V3, Vd, Vi, f
Measurements available	All
Protection functions available (according to type of Sepam)	All

Variant 3: measurement of 2 phase-to-phase voltages

Parameters

Voltages measured by VTs	U21, U32
Residual voltage	None

Functions available

Voltages measured	U21, U32
Values calculated	U13, Vd, Vi, f
Measurements available	U21, U32, U13, Vd, Vi, f
Protection functions available (according to type of Sepam)	All except ANSI 67N/67NC, 59N

Variant 4: measurement of 1 phase-to-phase voltage and residual voltage

Parameters

Voltages measured by VTs	U21 or V1
Residual voltage	External VT

Functions available

Voltages measured	U21, V0
Values calculated	f
Measurements available	U21, V0, f
Protection functions available (according to type of Sepam)	All except ANSI 67, 47, 27D, 32P, 32Q/40, 27S

Variant 5: measurement of 1 phase-to-phase voltage

Parameters

Voltages measured by VTs	U21 or V1
Residual voltage	None

Functions available

Voltages measured	U21 or V1
Values calculated	f
Measurements available	U21 or V1, f
Protection functions available (according to type of Sepam)	All except ANSI 67, 47, 27D, 32P, 32Q/40, 67N/67NC, 59N, 27S