Ultrasonic Detector

(formerly marketed as the

Ultraphonic Detector)

Detection of Corona Discharge

With the proliferation of sensitive FM receivers and color television has come an increasing awarenss of the problems posed by corona discharge causing interference in reception. Once it has been established that the interference source is not a nearby motor or appliance, the problem is one of rapid location of the corona interference.

For years, the accepted procedure has involved two technicians. One technician remained on the ground to operate a standard RF detector, the the other climbed the pole to probe suspect components with a "hot stick." The object was to find a component of the transmission system which caused a noticeable change in RF emission when probed. In some stubborn situations, it was necessary to go over an entire local system, tightening all components when the exact noise source could not be located. This procedure, of course, consumned a lot of unnecessary man-hours.

The Ultrasonic Detector (formerly marketed as the Ultraphonic Detector) has changed all this by eliminating one technician and speeding up the whole operation. The RF detector is still used to locate the pole or immediate area of trouble, but once this has been accomplished, the inspector switches to the Ultrasonic Detector (formerly marketed as the Ultraphonic Detector). Sounds heard through the Ultrasonic Detector (formerly marketed as the Ultraphonic Detector) as a result of Corona Discharge sound much the same as in the RF detector, but the Ultrasonic Detector is far more directional. Often the faulty component may be exactly located from the ground. Occasionally it may be necessary to partly climb the pole.

Being light and compact, the Ultrasonic Detector (formerly marketed as the Ultraphonic Detector) may be easily carried while patrolling a right-of-way. The built-in meter offers a safety feature in that the headphones need not be used in situations where the operator may be exposed to traffic and possibly need the use of his ears to detect an approaching vehicle.

Additionally, the extensions included in the Ultrasonic Detector (formerly marketed as the Ultraphonic Detector) package are highly effective in locating internal arc-ing in transformers. The probe is merely held by the inspector at right angles against the transformer case. For safety reasons, be sure to ground the case first.

In high voltage cable manufacturing, the insulation of a reel can be tested with "hi-pots" tests applied to each conductor. It is now necessary to locate the exact fault point so that the cable can be repaired. Usually, equipment is available which can locate the approximate fault location utilizing resistance measurements involving, again, high voltage. We need, however, to find the fault within an inch or so! This is where the Ultrasonic Detector (formerly marketed as the Ultraphonic Detector) comes into the mix. The cable is unwound from its reel onto another until the suspect area is exposed over a span of fifteen feet or more between the reels. Standing behind a safety barrier, the tester uses a pole mounted detector on a suitable insulated "hot-stick" to locate the exact source of the arc-ing sound.

Once the fault has been located in this manner, the high voltage is removed and repairs can be easily effected. Prior to recoiling the cable, a final test is usually made in the same manner after repairs are complete to be sure that they have been fully effective.

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Ultrasonic Detector

(formerly marketed as the

Ultraphonic Detector)

Detection of Corona Discharge

Safety

Security

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