Siemens ISGS SG8158-00 Manual do Utilizador descarregar pdf (Página 65)

Appendix B: Metering

Siemens Energy & Automation, Inc. 59

B.2 Power Conventions

Figure B.1 Complex Power Plane

Phase Angle Ø

Ø=0°, +kW,

kWh Imported,

Power Factor = 1

Ø=180°, -kW,

kWh Exported,

Power Factor = 1

Ø=270°, -kVAR,

kVARh Exported,

Power Factor = 0

Ø=90°, +kVAR,

kVARh Imported,

Power Factor = 0

Ø=0 to 90°

Power Factor Lag

Ø=90 to 180°

Power Factor Lead

Ø=270 to 360°

Power Factor Lead

Ø=180 to 270°

Power Factor Lag

Line Load

Export

Reverse

Negative

(kW/kVAR supplied

by the load)

Import

Forward

Positive

(kW/kVAR consumed

by the load)

isv3o_1.bk : isv3oxmt.frm Page 59 Wednesday, August 7, 1996 10:51 AM

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Siemens ISGS SG8158-00 Manual do Utilizador Página 65