The maximum number of physical analog measurement channels is eight. This can be achieved with two analog input modules. In addition to the local channels, a certain number of numerical channels is always calculated from physical measurements. This number also depends on the connection type of the TVTR function block
|
Connection type |
Function block |
Physical channels |
Numerical channels |
|---|---|---|---|
|
ULx × 1 |
ULxTVTR |
1 |
0 |
|
URES |
ULxTVTR |
1 |
0 |
|
ULx × 2 (Wye/Delta) |
ULxTVTR |
2 |
4 |
|
ULx × 2 + URES (Wye/Delta) |
ULxTVTR |
3 |
4 |
|
ULx × 3 (Delta) |
ULxTVTR |
3 |
3 |
|
ULx × 3 (Wye) |
ULxTVTR |
3 |
4 |
|
ILx × 3 |
ILxTCTR |
3 |
1 |
|
IRES |
RESxTCTR |
1 |
0 |
The maximum number of measurement channels is 19. This can be calculated by adding physical and numerical channels together.
In REX610 relays, the UTVTR functions automatically calculate missing signals if enough information is available. If measured Uo is needed for calculations but it is not provided, it is assumed to be zero. Table 2 shows possible voltage connections and outcome of the UTVTR function. A three-phase current connection in the ILTCTR function always provides a calculated Io channel.
|
Voltage connection |
Phase-to-phase voltages (Ph-Ph) |
Phase-to-neutral voltages (Ph-n) |
Residual voltage Uo |
|---|---|---|---|
|
3 × ph-n |
yes, calculated |
yes |
yes, calculated |
|
3 × ph-n + Uo |
yes, calculated |
yes |
yes |
|
2 × ph-n |
yes, calculated 1 |
yes, missing ph-n calculated 1 |
no |
|
2 × ph-n + Uo |
yes, calculated |
yes, missing ph-n calculated |
yes |
|
3 × ph-ph |
yes |
yes, calculated 1 |
no |
|
3 × ph-ph + Uo |
yes |
yes, calculated |
yes |
|
2 × ph-ph |
yes, missing ph-ph calculated |
yes, calculated 1 |
no |
|
2 × ph-ph + Uo |
yes, missing ph-ph calculated |
yes, calculated |
yes |