If the line is closed where a three-phase VT failure is present, the overcurrent detector will not operate and a VTS
block will be applied. Closing onto a thr
ee-phase fault will result in operation of the overcurrent detector and
prevent a VTS block being applied.
2.4 VTS IMPLEMENTATION
Voltage Transformer Supervision is usually used with devices with a 3-phase voltage input, such as the P643 and
P645 with the optional 3phase V
T input. it can however be implemented in a P642, but only if you have ordered a
model with 2-VT inputs, and if the VTs are configured as shown in the wiring diagrams.
VTS is implemented in the SUPERVISION column of the relevant settings group, under the sub-heading VT
SUPERVISION.
The following settings are relevant for VT Supervision:
● VTS Status: determines whether the VTS Operate output will be a blocking output or an alarm indication
only
● VTS Reset Mode: determines whether the Reset is to be manual or automatic
● VTS Time delay: determines the operating time delay
● VTS I> Inhibit: inhibits VTS operation in the case of a phase overcurrent fault
● VTS I2> Inhibit: inhibits VTS operation in the case of a negative sequence overcurrent fault
VTS is only enabled during a live line condition (as indicated by the pole dead logic) to prevent operation under
dead system conditions.
P64x Chapter 14 - Supervision
P64x-TM-EN-1.3 287
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