GE Multilin DTP-B, Instruction Manual

Page: 33 / 90

5. SETTINGS
5-4 DTP-B Digital Transformer Protection GEK-106243E
The independent settings for each table are as follows:
Table IV. Independent Settings for Each Table
Setting Limit Default Step
Differential Function
Settings
Sensitivity 0.2 - 0.4 x Itap 0.3 0.01
K1-K2 Inflexion 0 - 10 x Itap 5.0 0.01
K1 percentage restraint 15 - 100 % 30 0.01%
K2 percentage restraint 15 - 100 % 30 0.01%
2
nd
harmonic restraint 12 - 100 % 100 0.01%
5
th
harmonic restraint 12 - 100 % 100 0.01%
87B tap 4 - 12 x Itap 8 0.01 A
Comments about the Settings:
The "ACTIVE TABLE" setting allows you to select which of the three settings tables on the DTP unit is active at a
given moment. This selection can also be carried out by digital inputs configured for this purpose. If there is a
disagreement between this setting and the input selection, the last one has priority over the table selection via
setting.
The "PREFAULT CYCLES" setting is the number of cycles before the oscillography trigger to be registered by the
system (between 2 and 10 cycles). In any case the total number of cycles for an oscillography register is preset at
66 cycles, regardless of the setting for the number of pre-fault cycles.
The K1-K2 INFLEXION is the limit between two different zones of the percentage restraint. The set value is the
through current value, for which the slope changes.
The settings related to the third and fourth winding, will only be present in those units with 3 or 4 windings.