Search

Cyber Monday Offer ❱❱

Get 20% OFF on Pro Premium membership and 30% OFF on courses & bundles with discount code CYBERMONDAY21 (expires on Dec 3rd).

Home / Technical Articles / Mechanism of modern energy metering in LT and HT power substations and utilities

Energy Metering in Power System

Energy meters are one of the most important components for monitoring and data acquisition in a power system network with roles in every part of the power system network, from the generation to the commercialized end-users, through multiple transmission and distribution setups. They are primarily used for measuring energy for end-user billing and energy trading purpose.

Mechanism of modern energy metering in LT and HT power substations and utilities
Mechanism of modern energy metering in LT and HT power substations and utilities (on photo: voltage transformers in medium voltage metering cubicle)

In this article, the focus will be on the mechanism and purpose of energy metering in the power system network along with some essential dos and don’ts for their installation and operation.

The article skims through the basic operating principles, types, and general introductions related to energy meters while concentrating primarily on the modern applications and operational details.

Table of contents:

  1. Major Applications
  2. Metering in Power Substations:
    1. Technical and Constructional Requirement
    2. Input/Output Interface
  3. Metering for Utility End-Users:
    1. Metering for Small Consumers
    2. Metering for Bulk Consumers
    3. Sealing, Anti-Tempering, and Data-Safety
  4. Smart Meter: The New Normal

1. Major applications

The vast application of energy meters can be categorized into four major parts of the power system network: Generation, transmission, distribution, and utilization. Based on the type of system and application, the specification and customized functions of the meter differ, though the principle of measurement remains the same.

There are myriad sources of energy used for commercial electricity production, ranging from large-scale nuclear energy to more sustainable solar PV energy.

Irrespective of the types of sources and the voltage of their production, the energy meter find their use in measuring the total energy released by the source.

In some cases like roof-top solar PV systems, the energy meter should be capable of measuring the net energy to account for both incoming and outgoing power depending upon the availability of solar radiation.

Similarly, the next major application of the energy meters is in power substations to monitor the energy consumption pattern and sometimes to bill the inter-branch energy exchanges. Then comes the end-users, the customers of utility companies, where the energy meters are employed for billing purposes.

The energy meter is a continuously operating measuring device that displays, and records the electric energy consumed over a period by multiplying the measured instantaneous voltage and current. The construction and type of meter play a major role in how the current and voltage are measured.

Figure 1 shows the four-quadrant operation of energy meters. The first and fourth quadrant operation of meter measures the exported power/energy, whereas the second and third quadrant is for imported power/energy measurement (looking from the utility side).

Figure 1 – Four quadrant operation of energy meter

Four quadrant operation of energy meter
Figure 1 – Four quadrant operation of energy meter

The trivector meters are capable of four-quadrant operation and thus can also be used for net metering or reverse energy recording purposes. This feature of the trivector meters makes them very versatile and useful over a range of applications and also places them in a much higher echelon compared to their electromechanical counterparts, which lack this sort of flexibility.

Also, most of the static single-phase meters installed for household purposes are designed for two-quadrant operations (1st and 4th) only to record exported power.

Go back to the Contents Table ↑


2. Metering in power substations

Substation monitoring and data acquisition have come a long way from their initial days of analog systems. The modern static energy meters used in incoming and outgoing feeders of power substations come with various additional features.

Premium Membership Required

This technical article/guide requires a Premium Membership. You can choose an annually based Plus, Pro, or Enterprise membership plan. Subscribe and enjoy studying specialized technical articles, online video courses, electrical engineering guides, and papers. With EEP’s premium membership, you get additional essence that enhances your knowledge and experience in low- medium- and high-voltage engineering fields.

Check out each plan’s benefits and choose the membership plan that works best for you or your organization.

Cyber Monday Offer! – Save 20% on Pro membership plan with code CYBERMONDAY21

Log In »Learn More »

Premium Membership

Get access to premium HV/MV/LV technical articles, electrical engineering guides, research studies and much more! It helps you to shape up your technical skills in your everyday life as an electrical engineer.
More Information
author-pic

Bishal Lamichhane

Electrical Engineer (B.E Electrical, M. Sc Engineering) with specialization in energy systems planning. Actively involved in design and supervision of LV/MV substations, power supply augmentations and electrification for utilities and bulk consumers like airports and commercial entities. An enthusiast and scholar of power systems analysis.

Leave a Comment

Tell us what you're thinking... we care about your opinion! Please keep in mind that comments are moderated and rel="nofollow" is in use. So, please do not use a spammy keyword or a domain as your name, or it will be deleted. Let's have a professional and meaningful conversation instead. Thanks for dropping by!

two  +  7  =  

Cyber Monday Offer 🎀

Get 20% OFF on EEP Pro Premium membership and 30% OFF on courses & bundles with code CYBERMONDAY21 (expires on December 3rd).

Subscribe to Newsletter

Subscribe to our Weekly Digest newsletter and receive free updates on new technical articles, video courses and electrical guides.