Voltage Input (Vt) Connections; Overcurrent Protection For Voltage Input (Vt) Connections - Novatech Bitronics M87X Series Manual

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Signal Input Module S2C Used with Split-Core CTs on M872

7.5 Voltage Input (VT) Connections

The voltage terminal block is removable after unscrewing the mounting screws on the ends

of the block.

Voltage signals are measured using a 7.5MΩ resistor divider with a

continuous voltage rating of 7kV. This ideal impedance provides a low burden load for the

VT circuits supplying the signals.

Wiring diagrams, which represent the various

measurement configurations that are applicable for the instrument, are provided in Figure

Grounding of VT & CT signals per ANSI/IEEE C57.13.3-1983 is recommended. The

polarity of the applied signals is important to the function of the instrument.

The Auxiliary Voltage Input channels (M871 only) are physically identical to the other

voltage inputs on the Signal Input Module.

To maintain the safety features of this product, a 3 Ampere time delay (T) fuse must be

connected in series with the ungrounded/non-earthed (hot) side of the supply input

connected to the voltage measurement (VT) input of the instrument prior to installation.

The fuse must carry a voltage rating appropriate for the power system on which it is to be

used. A 3 Ampere slow blow UL Listed fuse in an appropriate fuse holder should be used

in order to maintain any UL product approval.

ML0021

August 15, 2018

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