TROUBLESHOOTING & REPAIR
59
AVTM21-415Ja Rev. A June 2005
2.
Remove the cover screws from both the 7.5 kV CAL and
the 15 kV CAL adjustments.
3.
Operate the test set (Refer Section 8). Set its voltmeter
range to 7.5 kV.
4.
Adjust the output voltage until the standard voltmeter
reads 5.0 kV.
5.
Using a fine blade screwdriver, adjust the 7.5 kV
potentiometer through the 7.5 kV CAL hole until it agrees
with the standard.
6.
Check at 7.5 kV full scale, then repeat for the 15 kV range
using the 15 kV CAL adjustment and an output of 10 kV.
Check at 15 kV full scale.
7.
Replace both CAL cover screws.
CALIBRATION OF MEGOHMMETER
Calibration accuracy is a function of the voltmeter accuracy.
Always calibrate the voltmeter as well as the megohmmeter.
The megohmmeter calibration requires a standard dc current
meter capable of measuring 5 µA to 5 mA to an accuracy of
±1% or better. Also required are the following testing resistors.
Desired Resistance
& Tolerance
Voltage
Watts
Part No.
100 Megohms ±1%
500
<1
4694-12
10 Megohms ±1%
5000
2.5
(2) 4694-7, in parallel
2 Megohms ±5%
7000
25
(2) 4694-8, in parallel
Check the X1K range first. This checks the unshunted meter
movement. There is no adjustment. Proceed as follows:
Содержание ATEC 210415 Series
Страница 2: ...15 kV Megohmmeter Test Set Catalog No 210415 Series M...
Страница 9: ...M 2 AVTM21 415Ja Rev A June 2005 Figure 1 15 kV Megohmmeter Test Set Catalog No 210415...
Страница 13: ...M 6 AVTM21 415Ja Rev A June 2005 M...
Страница 19: ...M 12 AVTM21 415Ja Rev A June 2005 M...
Страница 23: ...M 16 AVTM21 415Ja Rev A June 2005 Figure 2 Schematic Diagram of the 15 kV Megohmmeter...
Страница 30: ...SETTING UP 23 AVTM21 415Ja Rev A June 2005 Figure 4 Testing in a Substation...
Страница 32: ...SETTING UP 25 AVTM21 415Ja Rev A June 2005 Figure 6 Testing Transformer Terminals...
Страница 33: ...M 26 AVTM21 415Ja Rev A June 2005 Figure 7 DC Motor Test Setup Figure 8 Generator Test Setup...
Страница 47: ...M 40 AVTM21 415Ja Rev A June 2005 M...
Страница 53: ...M 46 AVTM21 415Ja Rev A June 2005 M...
Страница 57: ...M 50 AVTM21 415Ja Rev A June 2005 M...
Страница 73: ...M 66 AVTM21 415Ja Rev A June 2005 Figure 15A Interior View Figure 15B Interior View...
Страница 75: ...M 68 AVTM21 415Ja Rev A June 2005 M...
Страница 81: ...M 74 AVTM21 415Ja Rev A June 2005 M...
Страница 82: ...M 2621 Van Buren Avenue Norristown PA 19403 1 800 723 2861 ext 8578 megger com...
