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Economics of GIS

The equipment cost of GIS is naturally higher than that of AIS due to the grounded metal enclosure, the provision of an LCC, and the high degree of factory assembly…. Read more

Mar 04, 2011 | High Voltage

SF6 Gas Insulated Substations (GIS) - Mitsubishi Electric

How To Use A Digital Multimeter

A digital multimeter is used to make various electrical measurements, such as AC and DC voltage, AC and DC current, and resistance. It is called a multimeter because it combines… Read more

Feb 23, 2011 | Metering

How to use digital multimeter

Protection Relay – ANSI Standards

In the design of electrical power systems, the ANSI Standard Device Numbers denote what features a protective device supports (such as a relay or circuit breaker). These types of devices… Read more

Feb 22, 2011 | Energy and Power

ANSI codes for protection relays

What Is Modulation?

Modulation is the use of one electrical signal to “control” a primary variable of another. For example, if an audio signal voltage is used to control the “amplitude” of a… Read more

Feb 20, 2011 | Electronics

Modulation - addition of information (or the signal) to an electronic or optical signal carrier

IP Protection Degree (IEC 60529) Explained

The protection of enclosures against ingress of dirt or against the ingress of water is defined in IEC529 (BSEN60529:1991). Conversely, an enclosure which protects equipment against ingress of particles will… Read more

Feb 19, 2011 | IEC Standards

IP Protection Degree (IEC 60529) Explained


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