Lecture 40 Electro Mechanical System 1

Commercial Commercial Energy MetersEnergy Meters

Lecture 40 Electro Mechanical System 2

Consider a circuit with a source, a load, & appropriate meters. P and Q are positive, so the load absorbs both active and

reactive power. The line current I lags behind Eab by an angle . Current I has two components Ip & Iq. Value Ip = P/E & Iq = Q/E The apparent power S = EI, from which I = S/E The phasor diagram shows

S =apparent power [VA|:P =active power [W]:Q =reactive power [var]

The angle = arctan Iq / Ip = arctan Q/P

Relationship between P, Q, & S

222222

222 S so QPE

Q

E

P

E

SIII qp

Lecture 40 Electro Mechanical System 3

Energy Meters

Lecture 40 Electro Mechanical System 4

PEL Industries Single Phase Static Energy Meters

Single phase static energy meter used for measurement of active (kWh) energy for Domestic & commercial consumers. The meter complies with the IEC 62052-11, IEC 62053-21.

Single Phase Electromechanical Energy Meters Single phase active energy meter is used by house hold and small commercial customers. The meter complies with the IEC 62052-11 and IEC 62053-11.

Poly Phase Static Energy MetersThree phase multi-rate TOU/TOD meters are used for measurement of active (kWh) & reactive (kvarh) energy in the three phase four wire and three phase three wire network for residential , commercial & industrial consumers.

Energy Meters