Magnetic Fields; Figure 6-4 Electric Field Patterns; Figure 6-5 Magnetic Field Pattern - Will Burt D-Tect 5354901 Operator's Manual

E-Field Affected
by Vehicle

6.1.3 Magnetic Fields

A magnetic field (H-Field) is generated by the flow of electric current through a wire. When
current flows through a wire, the magnetic field is generated perpendicular to the flow. The more
current that flows, the stronger the magnetic field is. The ability of the D-TEC to sense a
magnetic field allows the system to sense the presence of electric energy even if the voltage is
low. This sensing method has proven to be effective near power generation plants or
transformer sub-stations where the relative voltage potential is low compared to the amount of
current. There are three magnetic field sensors in the D-TEC system and if any two approach
saturation simultaneously, the D-TEC system will alarm for a magnetic field. Buried electric
cables may also cause magnetic field alarms since the soil does not impede the magnetic field.
TP-5522901-00
July 2018
Earth = 0 Volts
Perfect E-Field
Maximum Volts / meter
0 Volts
Earth = 0 Volts
E-Field Affected by
Extended Mast

Figure 6-4 Electric Field Patterns

H-Field
Current Flow

Figure 6-5 Magnetic Field Pattern

D-TEC O
Maximum Volts / meter
0 Volts
Maximum Volts / meter
0 Volts
Earth = 0 Volts
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M
PERATOR S ANUAL
6-3