Substation

Meters

 
 
 

Introduction

An electric meter or energy meter is a device that measures the amount of electrical energy consumed by a residence, business, manufacture or an electrically powered device, it can be single or three phase meter. Electric meters are normally calibrated in billing units, the most common one being the kilowatt hour. Periodic readings of electric meters establish billing cycles and energy used during a cycle.


The conventional energy meter is of electromechanical induction meter operates by counting the revolutions of an aluminum disc which is made to rotate at a speed proportional to the power. The number of revolutions is thus proportional to the energy usage which will be charged by the utility.


In power distribution planning when energy savings during certain periods are desired, meters may measure demand, the maximum use of power in some interval. In the power distribution planning policy, the electric rates are higher during certain times of day, to encourage reduction in use. Also, in some areas like big factories, meters have relays special function to turn off nonessential equipment during on-peak period.


Electronic meters or Solid-state design meters display the energy used on an LCD or LED display, and can also transmit readings to remote places. In addition to measuring energy used, these meters can also record other parameters of the load and supply such as maximum demand, power factor and reactive power used etc. They can also support time-of-day billing, for example, recording the amount of energy used during on-peak and off-peak hours. Remote meter reading is a practical example of telemetry. It saves the cost of a human meter reader and the resulting mistakes, but it also allows more measurements, and remote provisioning. Many smart meters now include a switch to interrupt or restore service so called two ways communication energy meter.


Our product shall be imported from the well known and remarkable energy meter manufacture having the development of electronic processing (including solid-state) techniques making the kilowatthour meter more than just a device for billing purposes; it also provides another tool for use by the distribution engineer and operator. By adding memory and circuitry, it can be extended to control individual consumer loads in order to restrict consumer's demands and, collectively, reduce the peak demand back to the generators. However, our energy meter are designed to prevent thieves from tampering and non security as we have learnt that meters can be manipulated to make them under-register, effectively allowing power use without paying for it.


The electronic or solid state energy meter are not sustainable for direct sunlight installation service at the pole, to help extending the long service life same as elctromechanical energy meter we recommend to put the meter in the metallic cabinet which will be manufactured and tested to meet IP protection degree according to the requirement of utility or customers.


Features

The equipment shall have successfully passed all the type tests or design tests in accordance with the Thai Industry Standards and the following international standards:

  • ANSI Publication C12.1-1988: Electricity Metering
  • ANSI Publication C12.10-1987: Electromechanical Watthour Meters
  • ANSI Publication C12.16-1991: Solid-State Electricity Meters
  • ANSI Publication C12.20-1998: Electricity Meters 0.2 and 0.5 accuracy classes
  • IEC Publication 521-1976: Class 0.5, 1 and 2 alternating-current watthour meters
  • IEC Publication 61036-1996: Alternating current static watt-hour meters for active energy (class 1 and 2)
  • IEC Publication 60687-1992: Alternating current static watt-hour meters for active energy (class 0.2 and 0.5)
  • ISO/IEC Publication 15417: Information technology — Automatic identification and data capture techniques — Code 128 bar code symbology specification
  • IEC Publication 62053-21 Electricity metering equipment (a.c.) – Particular requirements – Part 21: Static meters for active energy (classes 1 and 2)
  • IEC Publication 62056-21: Electricity metering – Data exchange for meter reading, tariff and load control – Part 21: Direct local data exchange
  • IEC Publication 60529: Degrees of Protection Provided by Enclosures (IP Code)
  • TISI Publication1030-2534: Standard for Alternating Current Watthour Meters : Safety Requirements

All the products shall be completely passed the routine test before delivery to the local and oversea customers

Type

  • Meter Cabinets (Aluminum meter cabinet, Steel meter cabinet)
  • TOU meter
  • Watt Hour Meter (Single phase, Three phase)

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The equipment shall have successfully passed all the type tests or design tests in accordance with the Thai Industry Standards and the following international standards:

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