E.L.F. Magnetic Field Compensation [LV-EMFC] Research Project - part 2
4. LV-EMFS Survey Instrument Diagram
A.c. magnetic field signals originating
at the "reference sensor" are transmitted via UHF-FM link to a receiver
within the Probe Instrument. These signals, along with signals from "MAG-03"
tri-axial flux gate magnetometer, are processed through the intervening
network and are sent via umbilical cable to a PCMCIA analog-to-digital
converter card at the 486DX2-40 portable computer.
Block diagrams of remote Field Reference Monitor
and Probe Instrument.
5. ACMF Data Collection Using LV-EMFS System
Survey data collection across single-circuit 115
KV transmission line right-of way.
Survey data collection through 115 KV switchyard.
6. 115 KV Right-of-Way Data Record
Signal of high spectral purity (low harmonic
content) proportional to the transmission line currents are evident in
the y, z and R channels. Magnitude of the x channel magnetic field
signal is very low due to left-right source symmetry.
Time-resolved 115 KV transmission line right-of-way
x, y, z point record [file 43].
7. Fourier-Transformed Data Record
Spectral analysis is employed by the survey
instrument's computer program to extract the value of a fundamental line
frequency in the range of 25 to 400 Hz. This capability provides an automatic
means of identifying the basic source frequency for calculations such as
Frequency-domain transform of 115
KV transmission line right-of-way x, y, z point record [File 43].
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