Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1979-06-15
1981-05-05
Tokar, Michael J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 725, 324111, G01R 3112
Patent
active
042661846
ABSTRACT:
A method and apparatus are described for detecting faulty insulators used on overhead power transmission lines. The apparatus comprises two contact probes, a capacitance, a blocking resistance and a direct current meter in series between the probes to form an open electrical circuit. Means are provided to prevent discharging of the capacitance while the capacitance is being charged. In the use of the apparatus, the capacitance is charged from a source of high voltage direct current, the discharging of the capacitance to the source is avoided, the contact probes are sequentially applied across insulators and any current flowing across the insulators is recorded by the direct current meter. The sequential application of the contact probes is carried out while the insulators remain in service and the transmission line remains fully energized. The value of the capacitance is such that a large number of insulators can be tested before recharging becomes necessary. The value of the resistance is such that a blocking effect exists which causes a current of only a few micro amperes to pass through the current meter when testing a faulty insulator and thus avoids a rapid discharging of the capacitance.
REFERENCES:
patent: 1644421 (1927-10-01), Doble
patent: 1775530 (1930-09-01), Jansson
patent: 1923565 (1933-08-01), Austin
patent: 1943391 (1934-01-01), Paine et al.
patent: 2889395 (1959-06-01), Frakes
patent: 2923879 (1960-02-01), Povey
patent: 3363172 (1968-01-01), Doble
patent: 3439263 (1969-04-01), Broyles
Delbridge Robert F.
Fors Arne I.
Tokar Michael J.
LandOfFree
Method and apparatus for testing insulators does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for testing insulators, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for testing insulators will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-298017