Last edited by Duzil
Tuesday, January 28, 2020 | History

4 edition of Electricity meters: their construction and management found in the catalog.

Electricity meters: their construction and management

A practical manual for central station engineers, distribution engineers, and students

by Charles Henry William Gerhardi

  • 175 Want to read
  • 36 Currently reading

Published by Benn Brothers, Limited in London .
Written in English

    Subjects:
  • Electric meters.

  • Edition Notes

    StatementBy C. H. W. Gerhardi
    Series"The Electrician" series, "Electrician" series
    The Physical Object
    Paginationxx, 504 p
    Number of Pages504
    ID Numbers
    Open LibraryOL24171188M
    LC Control Numbera 25000321
    OCLC/WorldCa4924760

    AC became the dominant form of transmission of power with innovations in Europe and the US in electric motor designs and the development of engineered universal systems allowing the large number of legacy systems to be connected to large AC grids. In Europe, Asia, Africa and most other locations, single phase is common for residential and small commercial customers. A common method of tampering on mechanical disk meters is to attach magnets to the outside of the meter. The processing and communication section has the responsibility of calculating the various derived quantities from the digital values generated by the metering engine.

    In addition to measuring energy used, electronic meters can also record other parameters of the load and supply such as instantaneous and maximum rate of usage demands, voltages, power factor and reactive power used etc. Power companies often install remote-reporting meters specifically to enable remote detection of tampering, and specifically to discover energy theft. Meter readers are trained to spot signs of tampering, and with crude mechanical meters, the maximum rate may be charged each billing period until the tamper is removed, or the service is disconnected. A power meter can often be borrowed from the local power authorities [21] or a local public library. The downside of this is that the daytime rate per kWh is significantly higher, and that standing charges are sometimes higher.

    The Edison DC system needed thick copper conductor cables, and the generating plants needed to be within about 1. All of these effects can be detected by the electric company, and many modern meters can detect or compensate for them. Three phase service provides power for large agricultural facilities, petroleum pumping facilities, water plants, or other customers that have large loads Three phase equipment. Radial systems are commonly used in rural or suburban areas.


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Electricity meters: their construction and management book

Customers that generate back into the "grid" usually must have special equipment and safety devices to protect the grid components as well as the customer's own in case of faults electrical short circuits or maintenance of the grid say voltage on a downed line coming from an exporting customers facility.

As in the block diagram[ where? Starting in the s and s, nations began the process of deregulation and privatisationleading to electricity markets. Three-wire single-phase requires local transformers, as few as one per ten residences, but provides lower, safer voltages at the socket usually Vand provides two voltages to customers: neutral to phase usually Vand phase to phase usually V.

Power thefts in the United States are often connected with indoor marijuana grow operations. Statutory provisions may also specify a procedure to be followed should the accuracy be disputed. Large commercial users can purchase power by the hour using either forecast pricing or real-time pricing.

Additionally, three-wire customers normally have neutral wired to the zero side of the generator's windings, which gives earthing that can be easily measured to be safe. The processing and communication section has the responsibility of calculating the various derived quantities from the digital values generated by the metering engine.

Disadvantages of these included the need for regular visits to remove cashand risk of theft of the cash in the meter. This can be done by opening and closing switches to isolate a certain section from the grid.

The meter is plugged into an outlet, and the appliance to be measured is plugged into the meter. However, modern tamper-resistant meters can detect and bill it at standard rates. This contrasts with gas meters where if a meter is found to be under reading, it is assumed that it has under read for as long as the consumer has had a gas supply through it.

Around the world, experiments are going on, especially in developing countries, to test pre-payment systems. Hydro One subsequently offered free power monitors to 30, customers based on the success of the pilot.

The demand readings stored with the profiles accurately indicate the load requirements of the customer. Location[ edit ] Current transformers used as part of metering equipment for three-phase A electricity supply.

They can also support time-of-day billing, for example, recording the amount of energy used during on-peak and off-peak hours. A common method of tampering on mechanical disk meters is to attach magnets to the outside of the meter. This indicates that different metering is needed, for example, for a three-phase three-wire system than for a three-phase four-wire with neutral system.

In the UK, customers can use organisations such as the Post Office Ltd or PayPoint network, where rechargeable tokens Quantum cards for natural gas, or plastic "keys" for electricity can be loaded with whatever money the customer has available. In rural areas a pole-mount transformer may serve only one customer.

Any significant error in the registered energy can represent a loss to the electricity supplier, or the consumer being over billed. Many smart meters now include a switch to interrupt or restore service.

The introduction of advanced meters in residential areas has produced additional privacy issues that may affect ordinary customers. In principle, a sealed time switch can also be used, but is considered more vulnerable to tampering to obtain cheaper electricity.

In North America, overhead distribution systems may be three phase, four wire, with a neutral conductor.

Most split-phase residential meters in the United States are unable to detect neutral currents. Some industrial meters use a protocol for programmable logic controllers Modbus or DNP3.

Meters may also measure VAR-hours the reflected loadneutral and DC currents elevated by most electrical tamperingambient magnetic fields, etc. For the United Kingdom, any installed electricity meter is required to accurately record the consumed energy, but it is permitted to under-read by 3.

In some cases, prepayment meters have not been accepted by customers.A – Family residential gas meters will be placed outdoors. 4 –dwellings and larger, commercial and mix-use will be placedoutdoors unless “Waiver” exceptions apply. 7. Q - Do I have to physically protect the gas meter?

A –Yes, gas meters, regulators and associated gas piping that may be.

Documents & Guides

Tampa Electric has supplied the Tampa Bay area with electricity since Its West Central Florida service area covers 2, square miles, including all of Hillsborough County and.

Resources and information for customers of Central Hudson Gas & Electric. Skip to main content. Moving Save Outages Pay Sign In & Money My Usage History My Energy Options Switch to Natural Gas Solar & Distributed Energy Electric Vehicles Safety Our Energy Future Meters Kids Corner. Customer Service.

Electricity may be the one industry in which suppliers actively encourage customers to use less of their product, and that is partly due to demand-side management (DSM) policies.

DSM policies such as energy efficiency laws encourage or force utilities to sell less electricity, particularly during peak hours when electricity use and electricity.

Whether you’re running electric service to an outbuilding, adding a streetlamp, upgrading your heating system or getting to work on your dream home from the ground up, we can help! Learn More. Don’t fall for scam calls or texts claiming to be from Clark Public Utilities.

Learn how to protect yourself. Management of electrical equipment safety by Business Units Electrical equipment electricity supplies and their use on such sites shall comply with AS/NZS and that portable electrical construction work involving the establishing of an electrical installation on industrial, commercial, institutional or residential premises.