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T&D Companies


Building a Competency Program

At Valard, our people are the core and health of our business. Without our people, we have nothing. In fact, one of our slogans is “People. First.” However, being a people company means some of our biggest challenges are created by people. Our challenges are unique, as is each person...

CUEE is Back and as Big and Bold as Ever

It’s a show as large in scale as the challenges faced by the industry it serves, and as dynamic as the innovation that's being deployed to meet them. If you sell solutions to the electricity sector, you’ll want to seize this opportunity to reach operational and other key contacts within...

Why Net-Zero is Cheaper for the UK

The United Kingdom has set an ambitious target to achieve net-zero greenhouse gas emissions by 2050. This goal necessitates a comprehensive transformation of various sectors, including energy, transportation, and agriculture. While the environmental imperatives are clear, there is growing evidence...

Optimizing Equipment Maintenance with Hour Meters

Proper equipment maintenance is crucial for maximizing uptime, extending service life, and minimizing unexpected failures. One of the most effective tools for achieving this is the hour meter—a simple yet powerful device that tracks the duration of equipment operation. By accurately logging...

High Voltage Testing with AC Power Frequency

High Voltage, Inc. is a small design and manufacturing company located in the Hudson Valley region of New York State. Although small, we are a large presence in the electrical test equipment industry with a representative organization covering most of the world and a highly respected product line...

Radiator Fin(s) Leak Repair

Radiator fins are notorious for leaking at various locations. One of which is where the fins are attached (welded) to the horizontal bottom-run header. Measurements are taken so a weir box can be installed to cover the fin(s) that are leaking. It is preferred the weir box will cover above the...

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Zensol new instrument for OLTC testing

According to CIGRE A2.34, the dynamic resistance measurement or DRM (OFFLINE) is a test that offers diagnostics for several diverter or selector switch malfunctions such as: contact problems, broken springs, broken transition resistors, poor contact pressure, inadequate transition time, momentary open circuit, and synchronism motion issues.

Zensol’s DRM principle

Tap windings are powered with a DC voltage source. The current fluctuations are recorded during the switching process. The schematic below shows the principle of the...

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