Basler BE1-CDS220, Инструкция по эксплуатации

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4-14 Protection and Control BE1-CDS220
BESTCOMS can be used to provide auto tap calculation by filling in the appropriate fields on the
Percentage Differential screen (Figure 4-12) and pressing the calculate button or manual tap values can
be entered. In addition, the auto-tap calculation settings can be entered for each setting group from the
optional HMI using Screen 5.#.1.2, \PROT\SG#\87\MVA. The manual tap compensation settings can be
entered for each setting group from the optional HMI using Screen 5.#.1.3, \PROT\SG#\87\TAP. These
two screens are mutually exclusive. If the user enters settings on the TAP Screen, the MVA and KV
settings on the MVA Screen will be zeroed out. If the user enters settings on the MVA Screen, the
automatically calculated taps are shown on both screens.
The auto-tap calculation settings or the manual tap settings can be entered for each setting group with
BESSTCOMS or from the ASCII command interface using the S<g>-TAP87 command.
Figure 4-12. Percentage Differential Screen, 87 Phase Tab
NOTE to users of the BE1-87T Transformer Differential Relay:
Three-phase versions of the BE1-87T also allow internal phase compensation.
The jumper settings for the BE1-87T correspond to the internal compensation for
the BE1-CDS220 as follows:
∆
1 = DAC and
∆
2 = DAB.
When calculating the tap adjust settings for the BE1-87T, the
√
3 COMPn factor
has to be included regardless of whether phase compensation is done by
connecting the CTs in delta or by using internal delta compensation. The BE1-
CDS220 automatically takes the
√
3 factor into account prior to the tap adjustment
when internal phase compensation is applied to a set of CT input currents. Thus,
the tap adjust factors for these two relays will not be the same in applications
using internal phase compensation.