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Ungrounded Wye Unbalance Detection Discussion (Page 1 of 3)

Continuing in my series of unbalance detection discussions and schemes we will now look at floating WYE (ungrounded) capacitor connections.

Let us start with a balanced 3 phase, three wire capacitor scheme to see what numbers we come up with.

gilbert electrical systems, document library, basic electrical formulas, ungrounded, unbalance, calculation, capacitor, beaver, west virginia
Figure 1

See Figure 1. The parameters, as shown in figure 1 are as follows

Capacitor Bank 600 KVAR, 12,470 volts, with 2 – 100 KVAR 7200 volt units per phase.

XC for the 100 KVAR, 7200 volt capacitor is

XCgilbert electrical systems, document library, basic electrical formulas, ungrounded, unbalance, calculation, capacitor, beaver, west virginia

XC of 200 KVAR, @ 7200volts (for each phase) is

XC = gilbert electrical systems, document library, basic electrical formulas, ungrounded, unbalance, calculation, capacitor, beaver, west virginia

Capacitance is as Follows

C = gilbert electrical systems, document library, basic electrical formulas, ungrounded, unbalance, calculation, capacitor, beaver, west virginia

This Will Be

C = gilbert electrical systems, document library, basic electrical formulas, ungrounded, unbalance, calculation, capacitor, beaver, west virginia for the 100 KVAR and

C = gilbert electrical systems, document library, basic electrical formulas, ungrounded, unbalance, calculation, capacitor, beaver, west virginia for 200 KVAR.

Unit current = gilbert electrical systems, document library, basic electrical formulas, ungrounded, unbalance, calculation, capacitor, beaver, west virginia

Phase current = gilbert electrical systems, document library, basic electrical formulas, ungrounded, unbalance, calculation, capacitor, beaver, west virginia

Or gilbert electrical systems, document library, basic electrical formulas, ungrounded, unbalance, calculation, capacitor, beaver, west virginia

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