Recently, an existing 230 kV ACSR-SD (self-damping) transmission line was rerouted to a new substation about ½ mile away.
To accomplish this task and to accommodate right-of-way allowance, six new monopoles were set in the approximate center of an existing span. These six monopoles served as 90-deg deadend corners, converting the line from a horizontal to a vertical configuration.
The original conductors were cut mid-span and terminated with new compression deadend connectors on the respective new monopoles.
Due to the limitations and short life expectancy of compressing new connectors onto aged, weathered conductor, the utility elected to permanently protect these new connectors with ClampStar Electrical-Mechanical Shunts.
This is not the first time ClampStars were used on this line. In 2010, after experiencing several splice connector failures on this same line, a decision was made to protect the remaining splices with ClampStar units.
In 2014, a deadend let go, and they completed protecting the line by installing ClampStars on all the deadends. This approach effectively eliminated potential failure points and extended the usable life of the line by several decades. This eliminated the costs of reconductoring this critical line without even taking an outage.
With nine years of trouble-free service from this once condemned line, the utility looks forward to many more decades of service from this critical line. Additionally, as an added benefit, the installed ClampStars allow them to uprate the line, which can now operate at a notably higher ampacity load.
Klein Tools (www.kleintools.com) introduces the ET600 Insulation Resistance Tester, which is suitable for maintenance professionals who install, troubleshoot and maintain electrical wiring and equipment. This tester features voltage test ranges from 125 V to 1000 V, plus a lock feature for hands-free insulation testing.
Insulation Resistance Tester (Cat. No. ET600)
- Test insulation resistance up to 4000MΩ at 125V, 250V, 500V, and 1000V DC
- Measures up to 1000V AC/DC, low resistance, and continuity
- Automatic ranging True Root Mean Square (TRMS) technology for increased accuracy
- Test verification of conformity to EN61557-1, -2, -4
- CAT IV 600V and CAT III 1000V safety rating
- Test and Lock buttons for simple insulation testing
- Warning alarm and high voltage icon for detection of voltage
- Backlit display with bar graph, APO, High Voltage, Max/Min, and Hold icons
- Built-in stand and optional magnetic holder for hands-free operation
- Includes both Right Angle Test Leads and Heavy-Duty Alligator Clip Test Leads
- Low battery indicator with easily replaceable battery and fuse
“A resistance tester is essential for professionals to verify that electrical insulation is intact, or if an electrical system is exhibiting leakage current that needs maintenance,” says Sabrina Kalsi, product manager at Klein Tools. “Our Insulation Resistance Tester is built for testing at installation, during troubleshooting, or at annual maintenance.”
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December 20, 2019 at 12:02AM
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Utility Protects Transmission System With Electrical-Mechanical Shunts - Transmission & Distribution World
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