Where the customer reads the meter, the reading may be supplied to the power company by telephone, post or over the internet. Electronic meters now use low-power radio, GSM, GPRS, Bluetooth, IrDA, as well as RS-485 wired link. Aye Nyein Win 10 Nov 2017. One disadvantage of this system is that if the safety earth fails, it is difficult to discover this by direct measurement, because no phase has a voltage relative to earth. 3600 Different phase configurations use additional voltage and current coils. As with credit gas meters, you’ll most likely be billed monthly or quarterly, and may need to provide regular meter readings to make sure you’re not being under or over-charged. In principle, a sealed time switch can also be used, but is considered more vulnerable to tampering to obtain cheaper electricity. When tampering is detected, the normal tactic, legal in most areas of the United States, is to switch the subscriber to a "tampering" tariff charged at the meter's maximum designed current[citation needed]. Domestic variable-rate meters generally permit two to three tariffs ("peak", "off-peak" and "shoulder") and in such installations a simple electromechanical time switch may be used. In many other countries the supply and load terminals are in the meter housing itself. Cables are connected directly to the meter. Please try again later, or contact customer support, No Products Found Matching Those Criteria, No matching branches found, please try different Zipcode. Taking an electricity meter reading differs depending on the model as each displays information differently. [3] Aron's meter recorded the total charge used over time, and showed it on a series of clock dials. The traditional analog meter is a mechanical device found near the service entrance where the utility's service wires enter a building—either from overhead wires that enter the weatherhead and drop down through the conduit to the meter, or from underground service wires. The performance of these classes are described in detail against load, power factor, voltage variation, etc. These meters work by using a revolving dial that turns according to the amount of energy that is used. These investigations are an effective method to discover tampering. SEW® Standard Electric ST70 Series 2 1/2" "Big Look Style" Analog Panel Meters Characteristics : Ideal for OEM applications Case and Composition : Acrylic Resin front and bakelite case Four Stud mounting. The dials may be of the cyclometer type, an odometer-like display that is easy to read where for each dial a single digit is shown through a window in the face of the meter, or of the pointer type where a pointer indicates each digit. A common method of tampering on mechanical disk meters is to attach magnets to the outside of the meter. In some areas the meter is outside, often on a utility pole. In this case, you may be charged with a time of use tariff.Time of use tariffs can charge customers extremely low rates during off-peak times such as late at night. [19] Projects such as Google PowerMeter, take information from a smart meter and make it more readily available to users to help encourage conservation. In an induction type meter, creep is a phenomenon that can adversely affect accuracy, that occurs when the meter disc rotates continuously with potential applied and the load terminals open circuited. Since all power phases are relative to the neutral in this system, if the neutral is disconnected, it can be directly measured. Substations, inter-ties, and transformers normally have a high-accuracy meter for the area served. Automatic meter reading can be done with GSM (Global System for Mobile Communications) modems, one is attached to each meter and the other is placed at the central utility office. The most common schemes seem to combine an existing national standard for data (e.g. Interim Mindanao Electricity Market Metering Standards and Procedures Issue 1.0 –IMEM-MSP Public 3 1.2.1 This IMEM Manual covers the metering procedures and standards related to Meters and Metering Installations registered in the IMEM. These were the first alternating-current watt-hour meters, known by the name of Bláthy-meters. Robust & secure electric meter box supplies. Some industrial meters use a protocol for programmable logic controllers (Modbus or DNP3). The current coil similarly consumes a small amount of power in proportion to the square of the current flowing through it, typically up to a couple of watts at full load, which is registered on the meter. * Inventory details are not available due to some technical error. [2] The first accurate, recording electricity consumption meter was a DC meter by Dr Hermann Aron, who patented it in 1883. The company responsible for reading the meter may not always be the company which owns it. Multiple tariffs are made easier by time of use (TOU) meters which incorporate or are connected to a time switch and which have multiple registers. My understanding is all panels should be mounted 60″-72″ above finished grade. Electric utilities use electric meters installed at customers' premises for billing and monitoring purposes. When a customer is generating more electricity than required for his own use, the surplus may be exported back to the power grid. Shallenberger fell ill and was unable to refine his initial large and heavy design, although he did also develop a polyphase version. Lower power magnets can add to the drag resistance of the internal disk resistance magnets. American National Standards Institute, Inc. Some meters can be read over the internet. Some meters have an open collector or IR LED output that give 32-100 ms pulses for each metered amount of electrical energy, usually 1000-10000 pulses per kWh. Power thefts in the United States are often connected with indoor marijuana grow operations. Since the voltage of the supply should remain substantially constant, the reading of the meter was proportional to actual energy consumed. The amount of electricity used without being recorded during this small time is considered insignificant when compared to the inconvenience which might be caused to the customer by cutting off the electricity supply. This allows multiple top-up boosts to storage heaters, or a good spread of times to run a wet electric heating system on a cheaper electricity rate.[24]. There are various groups, such as the Standard Transfer Specification (STS) association, which promote common standards for prepayment metering systems across manufacturers. For the best experience on our site, be sure to turn on Javascript in your browser. Most split-phase residential meters in the United States are unable to detect neutral currents. The time of off-peak charging is usually seven hours between midnight and 7:00am GMT/BST, and this is designed to power storage heaters and immersion heaters. Demand is normally measured in watts, but averaged over a period, most often a quarter- or half-hour. Many experimental types of meter were developed. The voltage coil consumes a small and relatively constant amount of power, typically around 2 watts which is not registered on the meter. Electricity retailers may wish to charge customers different tariffs at different times of the day to better reflect the costs of generation and transmission. Electrical meters are supplied by the utility company. The meters fall into two basic categories, electromechanical and electronic. An early type of electrochemical meter used in the United Kingdom was the 'Reason' meter. Newer computerised meters usually have counter-measures against tampering. Blondel's theorem states that for any system with N current-carrying conductors, that N-1 measuring elements are sufficient to measure electrical energy. In addition to metering based on the amount of energy used, other types of metering are available. {\displaystyle P={{3600\cdot Kh} \over t}} How a Mechanical Analog Electric Meter Works . Recently, low-cost energy feedback displays have become available. Stored with the coils and mass of a button various protocols and interface with other.... 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