Electric Power Metering: Single- and 3-Phase Systems Course

Lesson 1 • Electrical Safety for Metering Work

Covers shock hazards, arc flash risks, and personal protective equipment specific to metering environments. Safety practices here apply throughout the entire course.

Lesson 2 • Energy Measurement Concepts

Introduces kilowatt-hour as the fundamental billing unit and explains demand intervals. Provides the conceptual link between instantaneous power and accumulated energy.

Lesson 3 • AC Voltage and Current Fundamentals

Covers sinusoidal waveforms, RMS values, and phase relationships. Establishes the mathematical basis needed for all subsequent metering calculations.

Lesson 1 • Meter Nameplate and Rating Data

Teaches interpretation of nameplate markings including Kh, Kr, test amperes, and voltage class. Accurate nameplate reading prevents installation and testing errors.

Lesson 2 • Electromechanical Induction Disk Meters

Explains the stator, rotor disk, and braking magnet assembly. Understanding mechanical operation provides the baseline for comparing solid-state designs.

Lesson 3 • Advanced Metering Infrastructure Meters

Introduces smart meter hardware, communication modules, and interval data recording. Positions AMI meters as the current industry standard for single-phase service.

Lesson 1 • Instrument Transformer-Rated Installations

Explains current transformer and potential transformer use for high-load single-phase services. Introduces multiplier factors applied to meter readings for billing.

Lesson 2 • Meter Socket and Base Configurations

Covers ringless and ring-type sockets, jaw arrangements, and bypass provisions. Socket knowledge is prerequisite to all installation and removal procedures.

Lesson 3 • Self-Contained Meter Wiring

Details line and load connections for 120 V and 240 V single-phase self-contained installations. Correct wiring sequence prevents meter damage and billing errors.

Lesson 1 • Wye and Delta System Configurations

Compares wye and delta source and load connections with voltage and current relationships. Meter connection type depends directly on system configuration.

Lesson 2 • Three-Phase Power Calculations

Derives formulas for balanced three-phase real, reactive, and apparent power. Calculation skills are applied directly in three-phase meter accuracy testing.

Lesson 3 • Three-Phase Voltage Generation

Explains how three displaced sinusoids are produced and combined. This phasor foundation is required before studying three-phase metering connections.

Lesson 1 • Polyphase Electronic and AMI Meters

Describes multi-function electronic meters measuring kWh, kVARh, kVAh, and demand simultaneously. Highlights programmable parameters that replace multiple single-function meters.

Lesson 2 • Meter Form Numbering System

Explains the industry form numbering convention and what each form designates. Form identification is the first step in any three-phase installation or test procedure.

Lesson 3 • Three-Stator Four-Wire Meter Forms

Covers forms for four-wire wye and four-wire delta services requiring three voltage and three current elements. Most commercial and industrial services use these forms.

Lesson 1 • Current Transformer Selection and Wiring

Covers CT ratio, accuracy class, burden rating, and polarity marking for three-phase installations. Correct CT selection and wiring directly determine billing accuracy.

Lesson 2 • Potential Transformer Selection and Wiring

Explains PT ratio, fusing, burden, and polarity for metering-class potential transformers. PT errors directly affect voltage measurement accuracy in billing calculations.

Lesson 3 • Installation Verification and Energization

Provides a systematic pre-energization checklist and post-energization verification using a phase angle meter. Verification prevents revenue loss from incorrect connections.

Lesson 1 • Instrument Transformer Accuracy Testing

Covers ratio and phase angle error testing for metering-class CTs and PTs. IT errors compound meter errors and must be evaluated for high-accuracy billing installations.

Lesson 2 • Meter Accuracy Standards and Tolerances

Defines accuracy class, percent registration, and allowable error limits from applicable standards. Establishes the acceptance criteria used in all subsequent testing procedures.

Lesson 3 • Meter Adjustment and Calibration

Explains light-load and full-load adjustment methods for electromechanical and electronic meters. Calibration restores meters to within allowable error limits after testing.

Lesson 4 • Single-Phase Meter Testing Procedures

Covers portable test unit setup, reference standard connection, and test sequence for single-phase meters. Builds hands-on testing skills before advancing to three-phase procedures.

Lesson 1 • Demand and Time-of-Use Billing Data

Covers peak demand extraction, TOU period assignment, and interval data validation. Demand and TOU data drive the majority of commercial and industrial billing charges.

Lesson 2 • Billing Calculation and Error Investigation

Walks through a complete bill calculation and systematic investigation of high-bill complaints. Connects metering accuracy, multipliers, and read data to final customer charges.

Lesson 3 • Manual and Automated Meter Reading

Compares dial, digital, and AMI remote reading methods and their error sources. Reading accuracy is the final link between metering hardware and correct customer billing.