Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1975-04-14
1977-12-13
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
307110, 324 9, 324 64, 324 65P, 363 60, G01R 3108, H02M 318
Patent
active
040631613
ABSTRACT:
A fault locator of the earth potential gradient type for locating faults in underground, unshielded, insulated, electrical power cables includes a high voltage pulsing unit for generating and applying high voltage pulses to a faulted power cable. The pulses pass through the power cable, out of the electrical fault, through the earth and back to the pulsing unit. The passage of the pulses through the earth forms potential differences between locations in the earth. These potential differences are monitored by a monitoring unit formed by a fault locator meter and a pair of probes inserted into the earth. The fault locator meter includes a galvanometer for indicating the potential differences and a control circuit that has high gain, automatic gain control, automatic needle centering, automatic earth potential offset compensation and a momentary contact switch to reduce the power drain. The fault locator meter is also easily and rapidly physically and electrically connectable to and disconnectable from a meter probe that may be readily driven into the earth using operator foot force and body weight alone. Thus, the need for a cable attachment between the fault locator meter and the meter probe is eliminated. The fault locator meter is used in connection with one or more remote probes that may be inserted into the earth in holes previously made by the meter probe. Using two remote probes can enable the fault locator meter to monitor approximately twice the potential difference in the earth than possible when using a single remote probe and the meter probe. The use of the two remote probes automatically electrically disconnects the fault locator meter from the meter probe. Each of the remote probes includes a coiled cable that is fixedly mounted on the remote probe for storage with the remote probe and that may be uncoiled to attach the remote probe to the fault locator meter. The pulsing unit includes a pulse generator having a bank of capacitors and a switching circuit for charging the bank of capacitors in parallel, for discharging the bank of capacitors in series and for isolating the charging circuit from the output circuit of the pulse generator. A pair of remote probes having partially-encapsulated, toroidal electrodes may be used to locate faults in power cables disposed under paved surfaces.
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Joslyn Mfg. and Supply Co.
Strecker Gerard R.
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