Voltage Transformer Cubicle Clause Samples

Voltage Transformer Cubicle. 2 1- Three-phase 630 A busbar 1- Triple pole isolator 1- Manual operating mechanism 3- HRC fuses to DIN specifications rated to suit VT’s rating (Note: Access to the fuses shall only be possible with the switch in the “Earth” position in such a way that both sides of the fuse are effectively earthed) 1- Auxiliary switch connected to the VT secondaries and opening with the 22 kV isolator to prevent feedback from the LV side 1- Secondary windings. Each PT shall be equipped with 2 windings: one winding to be used for metering and the second winding for protection 3- Single phase voltage transformers:- Ratio : 22 000 : 110 Rated burden : minimum of 10 VA Accuracy Class : CL 0.2 Ratio : 22 000: 110 √3 √3 Rated burden : minimum of 10 VA Accuracy Class : 3P 1 - LV fuse box containing 3 LV fuses of appropriate rating + 3 neutral links 1 - Built-in padlocking facility on the cubicle door The system shall be designed and implemented to prevent or damp any ferroresonance effect in the PTs. The burden for the PTs (metering) shall be a minimum of 10VA. However, Facility Owner shall provide burden calculations for the instrumentation transformers so as to ensure that the proposed PTs are rated correctly, and they are operating within the optimum range (i.e. between 0% and 100% of the rated burden). It can be assumed that the maximum burden for the meter is 3VA per phase and secondly, the supervisory cable used is 1.5 mm2 Copper cable. The front facia should be equipped with appropriate padlocking facilities that shall allow the operator to lock the disconnector switch and earth switch in close/open position independently.