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Technical Data

The following table summarizes the claimed
short circuit capabilities for the arresters.

Arrester Type Short Circuit Test
Current A(rms)
Short Circuit Test
Duration-Sec.
PDV65-Optima 15,000 .20
PDV65-Optima 7,500 .20
PDV65-Optima 500 1.0
PDV100-Optima 20,000 .20
PDV100-Optima 10,000 .20
PDV100-Optima 600 1.0
PVR-Optima 20,000 .20
PVR-Optima 10,000 .20
PVR-Optima 500 1.0

The table below summarizes the capabilities of these designs.

Test PDV100-Optima &
PVR-Optima
PDV65-Optima
High Current-
Short Duration
2 - 100 kA
Discharges
2 - 65 kA
Discharges
Low Current
Long Duration
20 - 250A x 2000
μsec Discharges
20 - 75A x 2000
μsec Discharges
Duty Cycle 20 - 10 kA
plus 2 - 40 kA
Discharges
22 - 5 kA
Discharges

The above is merely a summary of a portion of the design tests performed on PDV/PVR arresters. Contact your Ohio Brass sales representative for complete test reports on these two arresters.

Tests Verify PDV/PVR Arrester Design

Full Scale Fault Current Tests

Short circuit design tests were performed on PDV65-Optima, PDV100-Optima, and PVR-Optima arresters in accordance with Section 8.18 of IEEE C62.11-2006 Standard. Eight arresters of each type were tested. Per the standard, four samples were tested at the claimed high current withstand capability. Two of these samples were assembled with internal fuse wires. The other two were good arresters which were subjected to an overvoltage condition, which failed the arrester (with a weak source). The arrester was immediately subjected to the claimed high current fault current. Two additional arresters were subjected to fault currents approximately half of the claimed high current value. The fault current duration for all high current tests was 12 cycles. Finally, two arresters were subjected to a nominal 600 amp, 1 second fault current test. All test arresters were 17 kV MCOV, the longest single module configuration used for each arrester type. Tests were performed at full voltage (17 kV rms).

Successful performance was demonstrated when the epoxyfiberglass wrapped arrester modules burned through to relieve internal pressures associated with the fault current arcing. In all cases, the arrester remained intact, except at the high current levels which caused polymer housing fragmentation, which is acceptable.

PDV/PVR Design Test Report Summary

The PDV100-Optima and PDV65-Optima arresters have been tested in accordance with IEEE Standard C62.11-2006 for metal-oxide surge arresters. There is no standard for PVR arresters so they were tested per the heavy duty requirement.

The PDV100-Optima/PVR-Optima meet or exceed all the requirements for heavy-duty distribution arrester designs. The PDV65-Optima meets or exceeds all requirements for normal duty surge arresters.

The following curve shows that the low current end of the detonation range for the capacitor-graded Optima disconnector has been extended from 20 amps down to 1 amp. This assures proper disconnector operation even at very low fault current levels.

Optima Design Improvements

The Optima incorporates a redesigned disconnector and a new line end protective cap. Both of these are aimed at improving the overall system reliability.

Improved Disconnector Reliability

Historically distribution class surge arresters were installed with a ground lead disconnecting device. The purpose of this component is to allow a failed (shorted) arrester to automatically disconnect from the line. This allowed the line to quickly be returned to service and also provided a visual indication to crews as to which arrester had failed and needed to be replaced.

Occasionally under conditions that allowed a low fault current to flow through the arrester - damage will occur to the disconnector's internal grading resistor. When this condition occurs the disconnector will not operate. With the introduction of polymer arrester designs this situation was aggravated since it was nearly impossible to identify a failed arrester from the ground and the circuit would be locked out. The Optima design incorporates a patented capacitorgraded Optima disconnector into the insulated bracket attached to the base end of the arrester.

Laboratory testing has confirmed that the electrical integrity of the capacitor-graded Optima disconnector is not affected by exposure to prolonged TOV conditions or 100 kA lightning duty. In the unlikely event of arrester failure, it does ensure proper detonation of the disconnector, separating the arrester ground lead and preventing lockout from occurring.

Universal Protective Cap for PDV100 & PDV65 Optima

The new Optima line end protective cap is designed for single or thru connection lead wires. Each side of the cap has webbed fingers which prevent accidental contact with the arrester top end hardware by wildlife.

Temporary Overvoltage

MOV arresters by nature are voltage sensitive devices. At normal line to ground voltages, the arrester is energized at its MCOV (Maximum Continuous Operating Voltage) and conducts very little current. During disturbances on the system, the arrester can see elevated voltages and therefore higher 60Hz current through the unit. The magnitude and duration of the system-generated temporary over voltage (TOV) that the arrester can withstand is best expressed graphically. The two curves on the next page shows the TOV capability versus time for OB distribution style arresters. The Optima demonstrates an improved TOV capability. The capacitance-based isolator in Optima improves the TOV capability while increasing the reliability of disconnector function. The Optima technology results in a family of TOV curves that are a function of voltage rating of the arrester. Curves for other ratings can be found in our design test report online at http://www.hubbellpowersystems.com. Contact your HPS representative for more information on this new technology.

Hubbell Power Systems All contents Copyright© 2001 - Hubbell Incorporated. All rights reserved. Because Hubbell has a policy of continuous product improvement, we reserve the right to change design specifications without notice.
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