T.I. Chen Blog

  • 2019-04-16April

    Accuracy Class for Current Transformers

    The Shandong Yuanxing current transformers are designed for the accurate measurement of AC currents up to 120% of the rated primary current. The accuracy of the primary current to secondary signal transformation (either current or voltage) is stated as Accuracy Class. The Accuracy Class for the current transformers is measured in accordance with the IEC61869 […]


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  • 2019-04-16April

    DC Current Measurement

    The non-intrusive measurement of a DC current is accomplished through the use of electronic sensors that use the Hall Effect to monitor and measure electrical currents. What is the Hall Effect The Hall Effect is the principle that a magnetic field applied perpendicular to a current will create a proportional Hall voltage perpendicular to the […]


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  • 2019-02-07February

    AC Voltage Measurement, Intelligent Devices

    The accurate measurement of AC Voltage is complicated by the necessity to minimize the burden the measuring instrument places on the primary circuit. The incorporation of a 1:1 current style voltage transformer in the AC voltage measuring circuit offers several advantages. Features A minimal burden on the primary voltage circuit, with essentially zero primary circuit […]


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  • 2019-01-14January

    AC Current Measurement, Intelligent Devices

    The Supervisory Control and Data Acquisition (SCADA) systems used by electric utilities to manage the distribution of electric power are highly dependent upon the intelligent, micro-processor based devices installed throughout the electric power distribution grid. These intelligent devices acquire in real time the critical performance measurements (e.g. current, voltage), transmitting that information back to the […]


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  • 2018-12-03December

    AC Electric Power Monitoring and Measurement Sensors

    Retrofitting Existing Distribution Networks The current generation of electric power AC current sensors that are suitable for retrofitting existing distribution networks have obtained a level of accuracy capable of near revenue grade metering. These split-core sensor designs permit the installation of the AC current sensor without taking the primary conductor off-line. The standard solid-core AC […]


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  • 2018-09-17September

    Micro-Grid, Option for Restoring Electric Power to Puerto Rico

    I have read several interesting stories of organizations proposing and installing Micro-Grids as a means of restoring electric power to areas in Puerto Rico. The Micro-Grid systems incorporate electric power generation, electric power storage and/ or smart-grid connection to the electric utility distribution network. The installations goals are; Restoring electric power. Providing backup to critical […]


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  • 2016-09-23September

    California Zero Net Energy Program: Part 2

    The California Zero Net Energy program discussed in the previous post will have a significant impact on new construction. The average residential electric power usage in the State of California is 6,741 kWh per year (U.S. Energy Information Administration) or 18.5 kWh per day on average. Presumably a residential home will generate electric power using […]


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  • 2016-09-16September

    California Zero Net Energy Program

    I recently read an article about the California Zero Net Energy program whose stated goal is that all new residential construction in California will be zero net energy by 2020. All new commercial construction will be zero net energy by 2030. Zero Net Energy (ZNE) is defined to be that the building will produce as […]


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  • 2015-11-13November

    Free Electric Power

    The New York Times published an article recently on how TXU Energy (Dallas/ Fort Worth, Texas) is offering their customers free electricity during certain times of the day. A little background may be helpful. There are three electrical grids that cover the mainland United States, essentially East coast, West coast and Texas. Several years ago, […]


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  • 2015-06-03June

    Electric Power Generation Business Model – Part 1

    In the 1990’s the trend was to break-up the electric utility monopolies into separate Generation, Transmission and Distribution businesses. The intent was to open up the electric power generation side of the business to more market oriented competition with the hope of lowering prices for electricity at the wholesale and retail level Two trends have […]


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