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Megger MEG10-1 Upto 10kV, 10 kV Insulation Tester
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Operates from mains supply or rechargeable battery
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Real time data output and on-board storage for subsequent
download
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Integral lead storage
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Results displayed as Insulation Resistance or leakage
current
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Integral timer for automatic Insulation Resistance and
Polarisation Index tests
The Megger MEG10-01 is a compact, microprocessor controlled high voltage d.c.
insulation tester, which may be powered by internal rechargeable batteries or
by connection to an a.c. supply. It is built into an extremely robust moulded
case with internal provision for test lead and mains power cord storage.
Measurement results are clearly displayed on the custom digital and analogue
LCD display as either an Insulation Resistance or a Leakage Current.
The measurement range, subject to test voltage, is up to 500 GW
on the digital display, and to 1 TW
at all voltages on the analogue scale. Test voltages of 500 V, 1000 V, 2500
V, 5000 V and 10,000 V are available and are selected by two buttons on the
front panel.
IEEE43: 2000 "IEEE Recommended Practice for Testing Insulation Resistance of
Rotating Machinery" now offers the option of testing machines rated above 12
kV at 10 kV instead of the previous 5 kV maximum. The 10 kV range on the
MEG10-01 allows this test to be easily achieved. An integral timer is started
automatically on commencement of a test, which displays elapsed time in
minutes and seconds. This timer may also be used to automatically stop an
insulation resistance test and an automatic Polarisation Index test. At the
end of any test, capacitive loads are automatically discharged and the
decaying voltage is displayed until it reaches a safe level. At any point, a
flashing LED and segments on the display indicate the presence of a dangerous
voltage.
The battery condition is continually monitored while the instrument is
switched on and the battery condition is shown by a 5-segment bar graph on the
display.
Power is provided by an a.c. supply or from an internal rechargeable battery
which when fully charged is capable of providing at least 4 hours continuous
testing at 10 kV before requiring recharge.
For those users who prefer to store their test results for later download, the
MEG10-01 has on-board memory capable of storing typically 30 test summaries
although this will vary according to the type of test and test duration. This
summary information is suitable for reporting purposes.
However, if long term testing is required with more detailed data, the
MEG10-01 outputs data over its RS232 port very second, in real time. A PC may
be used to capture this data and under these circumstances the amount of data
is limited by the amount of storage space available on the PC. The volume of
data only consumes approximately 2.4 kB for every minute of output. This real
time feature allows detailed data to be captured for later analysis.
Applications
Manufacturers, users and maintainers of rotating machinery will find the
Megger MEG10-01 a perfect every day work
tool. Designed in accordance with the requirements of IEEE43:
2000 the MEG10-01 is the ideal instrument for measuring the insulation
resistance of armature and field windings in rotating machines rated 1hp (750
W) or greater. The
standard applies to synchronous, induction and d.c. machines
as well as synchronous condensers.
The Megger MEG10-01 also performs automatic Polarisation Index
tests. This test is routinely performed on a variety of equipment and cables
to assess the general condition of the insulation before applying a
potentially destructive applied voltage test at voltages greater than rated
voltage.
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Specification
Test Voltages (d.c.)
500 V, 1000 V, 2500
V,
5000 V, 10000 V
Test Voltage Accuracy
±5% on 100 MW
load and
above
Insulation
resistance ranges
Digital:
Analogue:
100 kW to 1 TW
@ all
voltages
Accuracy (at 23°C)
±5% on 100 MW load
Basic Accuracy
±5% of reading 10 MW to 100 GW
,
all voltages
Current Range
0,01 nA to 999 µA
Accuracy (at 23°C)
±5% +/- 1nA on 100
MW
load.
Basic Accuracy
±5% of reading 10 MW
to 100 GW
all voltages
Guard
2% error guarding
500 kW
leakage with 100 MW load.
Short circuit current
5mA nominal.
Voltmeter
Range
50 to 1000 V d.c.
or a.c.
Accuracy (23°C)
±2% ±1 V.
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Interference
Rejection
1 mA r.m.s. per kV
to a maximum of 2 mA.
Capacitor discharge
time
<2 s per µF to
discharge from 10 kV to 50 V.
Timer
0:00 to 99:59
minutes. Instrument can be set to stop a test after a
time limit, or to
run indefinitely.
Instrument Display
3 digit LCD
Analogue/Digital
Power supply
Rechargeable,
sealed lead-acid batteries (12 V, 4 Ah), or 95 V to 265 V 50/60
Hz supply.
Battery life
Typically 4 hrs
continuous testing at 10 kV, increasing to 8 hours at 5
kV and lower. Remaining battery life indicated on display.
Battery charging
Charging takes
approximately 12 hours from ac supply in the range 95 to
265 V.
Temperature range
Operating:-
-20°C
to +50°C
(4°F
to 122°F)
Storage:-
-25°C
to +65°C
(-12°F
to 149°F)
Humidity:
90% R.H. @ 40°C
(104°F)max.
Temperature coefficient
±0,1% per °C
over the test voltage over the temperature range 0°C to +30°C.
(±0.06% per °F)
Instrument
protection. IP54 with case
closed.
Safety
The instrument
meets the requirements of EN61010-1:2001 for operation at
an altitude of 2000 m above sea level or less.
EMC
The instrument
meets the requirements of EN61326-1:1998 for use in areas
other than domestic.
Dimensions
385mm x 265mm x
250mm (15 x 10 x 9 inches) Weight 7 kg
(15 lb) approx
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