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The electricity meter is an indispensable measurement tool in the power industry, but it consumes a certain amount of electricity. Bulgarian experts say that in a mega-city like New York, the amount of reactive energy consumed by the meter is almost equal to the power generated by the Niagara River hydropower station in the United States (the US installed capacity of the Niagara River hydropower station is 2 million kilowatts). The mechanical watt-hour meter has a large energy consumption and the error rate is 7-8%, which has been gradually replaced by an inductive electronic watt-hour meter. However, electronic meters require current and voltage parametric amplifiers, and reactive power losses must be considered when calculating power, known as the power factor cosφ. In addition, the current and voltage parameters in the electronic amplifier are non-linear, and linear processing is a complicated technical work, and the ambient temperature also has a certain influence on the amplifier.
Bulgarian experts believe that the key to solving these problems is to create low-cost and high-reliability sensors with the function of an amplifier. Currently, such multi-purpose sensors have been introduced at the Bulgarian Institute of Management and Systems, which Bulgarian experts call multisensors. This type of sensor is an integrated block made of semiconductor silicon components that functions far more than measuring a single value.
Experts believe that multi-sensors solve a number of problems in innovation. For example, in addition to converting magnetic energy into electrical energy, those processes are also generated on the sensor in the magnetic field; there are also mechanical programs on the sensor; can you obtain some non-pressure such as pressure, temperature, illumination, etc. when processing the output signal? Telecommunications parameters, etc. The newly developed integrated silicon multi-sensor can simultaneously and independently measure the external magnetic field strength and direction (B) and ambient temperature (T). According to experts, there is no similar multi-purpose sensor in the field of current monitoring technology. It can be widely used in various disciplines, and can also be used for non-contact electric power measurement because it also has voltage (V) and current (I). The function of the electronic amplifier. This versatile sensor has a 50x improvement in conversion performance compared to currently used Hall sensors. It is reported that Bulgaria's multi-purpose sensors have been included in the priority discussion project of the EU's 7th framework.
The technical secret of this new multi-purpose sensor is the ability to amplify the induced voltage (V) and current (I). Its working principle is as follows. When the starting current (I) flows through the power conductor in the magnetic field (B), the recorded magnetic induction (B) perpendicular to the current (I) is equivalent to the induced current (I) parameter, at which time the transmission conductor and the induction There is no current contact between the devices. Hall elements have traditionally been used in the past, but the problem with Hall elements is that they are less sensitive and do not easily eliminate the effects of temperature on the measured parameters.
Bulgaria developed a high-efficiency energy-saving meter sensor
Recently, the Bulgarian Institute of Management and Systems completed an important innovation project for the national power industry, developing a new multi-purpose sensor for inductive watt-hour meters, which is 50 times more efficient than Hall sensors.