详细介绍：

The NPW 800 relay performs measurement of apparent (S), active (P) and reactive (Q) power of 3 or 4 wire electrical networks.Management of power factor, tangent φ and the supervision of network voltage and frequency can complement the monitoring of energy flow direction.
ANSI FUNCTIONS FOR NPM 800:
49 / 50 / 51N / 37I / 46 / 48 / 51LR / 66 / 5 / 50BF / 86 / 74TC
ANSI FUNCTIONS FOR NPW 800:
27 / 32P / 32Q / 37P / 37Q / 59 / 59N / 74TC / 78 / 81U / 81O / 86 B

ADDITIONAL FUNCTIONS :
ΣP / ΣQ / [Q/P] (Tgφ )