DESCRIPTION
15
AVTM21-415Ja Rev. A June 2005
used as the power-on switch. When power is available and CB1
is closed the green ac ON lamp comes on. The path is
interrupted by the contact of K2. Moving the voltage control
T1 to zero closes the contacts of the zero start switch. This
action applies the line voltage to the coil of K2 and ultimately
to T1. The red "HIGH VOLTAGE ON" lamp lights since it
parallels the coil of K2. Relay K2 will now remain closed even
if the voltage control is advanced off its zero position. The line
voltage is fed to T1 through the stabilization selector switch
S1, directly when S1 is closed in the OUT position. Raising the
voltage control now applies a controlled voltage to the primary
of T101 through the trip coil of circuit breaker switch CB2.
When S1 is set to the "IN" position (stabilized) voltage is
applied to T1 through resistor R1 and a parallel path exists
from the input of T1 to the circuit return through the back-to-
back connected Zener diodes CR1 and CR2. These diodes clip
the peaks of the voltage across T1 so that any transient
changes in the line supply voltage do not change the crest
amplitude. This stabilizes the output voltage as long as the load
current does not exceed 50 µA.
The 50 µA limit is equivalent to
300 Megohms at 15 kV.
Power Supply Option
Test sets equipped with the -47 optional input differ from
standard sets in that separate step-down transformers T2 and
T3 are included between the power source and the Test Set.
The nominal line voltage is specified at purchase. Transformers
are located in the cover of the Test Set.
Optional output voltages may be selected in accordance with
the table on the schematic Figure 2.
Summary of Contents for ATEC 210415 Series
Page 2: ...15 kV Megohmmeter Test Set Catalog No 210415 Series M...
Page 9: ...M 2 AVTM21 415Ja Rev A June 2005 Figure 1 15 kV Megohmmeter Test Set Catalog No 210415...
Page 13: ...M 6 AVTM21 415Ja Rev A June 2005 M...
Page 19: ...M 12 AVTM21 415Ja Rev A June 2005 M...
Page 23: ...M 16 AVTM21 415Ja Rev A June 2005 Figure 2 Schematic Diagram of the 15 kV Megohmmeter...
Page 30: ...SETTING UP 23 AVTM21 415Ja Rev A June 2005 Figure 4 Testing in a Substation...
Page 32: ...SETTING UP 25 AVTM21 415Ja Rev A June 2005 Figure 6 Testing Transformer Terminals...
Page 33: ...M 26 AVTM21 415Ja Rev A June 2005 Figure 7 DC Motor Test Setup Figure 8 Generator Test Setup...
Page 47: ...M 40 AVTM21 415Ja Rev A June 2005 M...
Page 53: ...M 46 AVTM21 415Ja Rev A June 2005 M...
Page 57: ...M 50 AVTM21 415Ja Rev A June 2005 M...
Page 73: ...M 66 AVTM21 415Ja Rev A June 2005 Figure 15A Interior View Figure 15B Interior View...
Page 75: ...M 68 AVTM21 415Ja Rev A June 2005 M...
Page 81: ...M 74 AVTM21 415Ja Rev A June 2005 M...
Page 82: ...M 2621 Van Buren Avenue Norristown PA 19403 1 800 723 2861 ext 8578 megger com...
