MIT515, MIT525, MIT1025 5-kV and 10-kV Insulation Resistance Testers

MIT515, MIT525, MIT1025 5-kV and 10-kV Insulation Resistance Testers
MIT515, MIT525, MIT1025
5-kV and 10-kV dc Insulation Resistance Testers
MIT515, MIT525, MIT1025
5-kV and 10-kV Insulation Resistance Testers
DESCRIPTION
The new range of insulation resistance testers consists of
three models: two 5 kV units (MIT515 and MIT525) and a
10 kV unit (MIT1025). Resistance measurement is available
up to 10 TΩ for the 5 kV models and 20 TΩ for the 10 kV
model. The new instruments are smaller and lighter than
previous models yet offer advanced features and rapid
charge capability.
A key productivity feature is the ability to take
measurements when connected to line power/mains with
a dead battery. Intelligent battery charging ensures the
optimum charge rate as a function of battery level, resulting
in minimum charge times.
The rugged, unique dual case design provides the ultimate
protection for a portable instrument and a clip-on lead
pouch ensures that leads remain with the instrument at
all times. The case lid is removable for improved terminal
access. IP rating is IP65 with the case closed preventing
water/dust ingress. High reliability and safety are built in;
all models are safety rated to CATIV 600 V and are double
insulated.
Five preset voltage ranges are provided in insulation
test mode, plus a user settable lock voltage range. Any
selectable test voltage may be locked and restored
via the selector switch, thereby increasing efficiency
of commissioning and repetitive tests. Preconfigured
diagnostic tests include Polarization Index (PI), Dielectric
Absorption Ratio (DAR), dielectric discharge (DD), Step
Voltage (SV) and ramp test.
n
Industry best guard terminal accuracy
n
Compact and lightweight for easy
transport and use
■■
PI, DAR, DD, SV and ramp test
■■
Unique dual case design provides
additional user protection
■■
Lithium-ion battery - extended capacity,
rapid charge
■■
Advanced memory with time/date stamp
■■
CATIV 600 V safety rating on all terminals
The ramp function gradually increases voltage up to a
selected level while graphing current vs. voltage (graph
downloadable). Graphs can be compared to example
curves in IEEE 95-2002 to reveal a variety of faults difficult
to detect otherwise. Small defects can be easily detected
without risking the sudden large voltage increments
produced by a Step Voltage test. Monitoring the developing
graph during test enables the operator to terminate prior
to breakdown, thereby reducing the possibility of damage
to already flawed insulation. These units are particularly
informative on polyester, asphalt and epoxy-mica
insulations. They can also test voltage suppression devices.
Simplicity of operation is achieved with two rotary switches
and the large backlit display enables multiple results to be
displayed simultaneously.
Advanced memory storage includes time/date stamping of
results, logging of data and recall of results to screen. A
fully isolated USB device interface (type B) is used for safe
transfer of data to Megger’s PowerDB asset management
software.
Typical end users include:
■ Electrical
■ Testing
■ Wind
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and service companies
farm and solar generation operators
■ Power
generation and distribution companies
■ Industrial
■ Rail
contractors
companies
companies
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MIT515, MIT525, MIT1025
5-kV and 10-kV dc Insulation Resistance Testers
FEATURES AND BENEFITS
■ Smaller size and lighter weight allows easier transport
and use without compromising performance.
■
High measurement range enables installation testing and
long-term trending of higher value apparatus.
■ Locking
■ 3
mA short circuit current with unique max power
regulations technology ensures maximum transfer
whatever the load until selected voltage is reached.
■ 5%
accuracy all the way up to 1 T-ohm at 5 kV and
2 T-ohm at 10 kV ensures highest accuracy where it
matters most.
■ Unique
dual case design allows for fire-retardant
protection while maintaining ruggedness.
flexible silicon test leads meet safety
regulations of IEC 61010-31:2008 while ensuring
measurement accuracy.
test leads provide additional safety.
■ High-quality,
■ Date
■ Timed
APPLICATIONS
The units are designed for testing the insulation of highvoltage electric equipment. Their wide voltage range
also allows applications for low-voltage equipment.
Generators, motors, transformers, cables and switchgear all
require effective maintenance. The test techniques on the
instruments provide valuable diagnostic information.
IR plus PI, DAR, DD, SV and ramp tests maximize
diagnostic testing capability.
■ Operate
from line power when battery fully discharged
(charges while operating).
■ Two
and one-half hour full battery charge time (one-half
hour charge for one hour testing) significantly increases
productivity.
■ Up
to six hours continuous testing (5 kV) on a single
battery charge.
n Industry
best guard terminal performance to insure
highest accuracy of measured values.
driver technology provides plug-and-play
when connected to the internet. No tedious and
potentially interruptive setup procedures.
and time-stamped test results reduce the risk of
error in result interpretation.
All three instruments test the insulation resistance of:
n High-voltage
n Large
n Line
power cables and high-voltage buses
motor/generator windings
and substation transformers
n Enhanced
The MIT525 and MIT1025 also perform spot tests, stepvoltage tests, dielectric discharge tests, ramp tests, and
dielectric absorption tests for the following applications:
■ Dedicated
n Acceptance
voltmeter function (30 V to 660 V) with
frequency measurement allows the user to check for
induced voltages.
■ CATIV
600 V safety rating on all terminals allows for
safe use in the widest range of applications.
■ Large
LCD with automatic backlight.
filter rejects up to 3 mA noise for effective
operation in electrically noisy environments.
■ High
altitude operation up to 3000 m while maintaining
CATIV 600 V rating.
■ Field
switch operation for easy, intuitive field use.
replaceable battery.
What is the IEEE Standard 43-2000?
In March 2000, the IEEE-SA Standards Board approved
a revision of IEEE Std 43-1974 by the Electric Machinery
Committee of the IEEE Power Engineering Society. This
revision is IEEE Std 43-2000, the “IEEE Recommended
Practice for Testing Insulation Resistance of Rotating
Machinery.” Following is a brief summary of its highlights:
n Test
voltages up to 10 kV are recommended for
windings rated greater than 12 kV.
n Both
the insulation resistance and the polarization index
test are recommended.
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n
Routine preventive/predictive maintenance testing after
installation.
n QA
testing as part of the manufacturing process.
n Diagnostic
■ Noise
■ Rotary
testing at installation to check conformance
to specifications.
testing to isolate faulty components for repair.
With its higher voltage testing capability, the MIT1025 is the
perfect everyday work tool for manufacturers, users and
maintainers of rotating machinery. Designed in accordance
with the requirements of IEEE43:2000, the MIT1025 is ideal
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 dc machines as well as synchronous condensers.
n Test
results should be compared to historical values to
identify changes.
n In
lieu of historical records, minimum acceptable values
(based on the type of equipment) for both tests are
indicated.
n Depending
on the machine rating, the readings for one
or both tests should exceed the minimum acceptable
values.
n If
the readings are below the minimum acceptable
values, the winding is not recommended for an overvoltage test or for operation.
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MIT515, MIT525, MIT1025
5-kV and 10-kV dc Insulation Resistance Testers
SPECIFICATIONS
Guard Terminal
2% error guarding 500 kΩ leakage with 100 mΩ load
Insulation Range, Analog
100 kW to 10 TW
Voltage Input Range
85 to 265 V, 50/60 Hz, 60 VA
Insulation Range, Digital
MIT515 & MIT525: 10 kW to 10 TW
MIT1025: 10 kW to 20 TW
Battery Type
Lithium-ion, 11.1 V, 5.2 A hour, meets IEC 62133:2003
Test Voltages
MIT515 & MIT525: 250 V, 500 V, 1000 V, 2500 V, and 5000 V
MIT1025: 500 V, 1000 V, 2500 V, 5000 V, and 10,000 V
User Defined Test Voltages
MIT515 & MIT525: 100 V to 1 kV in 10 V steps,
1 kV to 5 kV in 25 V steps
MIT1025: Same as above plus 5 kV to 10 kV in 25 V steps
Battery Life
MIT515 & MIT525: Typical capacity 6 hours continuous at 5 kV
with a 100 MW load
MIT1025: Typical capacity 4.5 hours continuous at 10 kV with a
100 MW load
Battery Charge Time
2.5 hours from deep discharge, 2 hours normal discharge
30 min. quick charge: 1 hour operation at 5 kV, 100 MW
Accuracy (23º C)
MIT515 & MIT525: ±5% to 1 TΩ, ±20% to 10 TΩ
MIT1025: ±5% to 2 TΩ, ±20% to 20 TΩ
Safety
Meets the requirements of IEC61010-1 CAT IV 600 V
Default voltmeter warns operator of applied voltage above 50 V
Voltage Output Accuracy (0ºC to 30ºC)
+4% -0% ±10 V of nominal test voltage at 1 GW load
EMC
Meets the requirements of IEC61326-1
Voltmeter Range
30 to 660 V ac or dc, 50/60 Hz
Accuracy: ±3% ±3 V
Frequency range: 45 Hz to 65 Hz
Ingress Protection
IP65 (lid closed); IP40 (lid open)
Short Circuit Current
3 mA nominal, max. power on all loads outperforming many
5 mA testers
Insulation Alarm
100 kΩ to 1 GΩ
Temperature Range
Operating: -4ºF to +122ºF (-20ºC to +50ºC)
Storage: -13ºF to +149ºF (-25ºC to +65ºC)
Humidity Range
90% RH @ 104ºF (40ºC)
Altitude
3000 m, CAT rating maintained >2000 m*
(*test load connected)
Current Measurement
Range: 0.01 nA to 6 mA
Accuracy: ±5% ±0.2 nA at all voltages
Dimensions
12 in. x 11 in. x 7 in. (315 mm x 285 mm x 181 mm)
Capacitance Range (above 500 V)
10 nF to 25 µF (dependent on measurement voltage)
Accuracy (23ºC): ±10% ±5 nF
Weight
10 lb. (4.5 kg)
Capacitor Charge
MIT515 & MIT525: <3 s per µF at 3 mA to 5 kV
MIT1025: <5 s per µF at 3 mA to 10 kV
Capacitor Discharge
MIT515 & MIT525: <250 ms/µF to discharge from 5000 V to 50 V
MIT1025: <500 ms/µF to discharge from 10,000 V to 50 V
Timer Range
Up to 99 minutes, 15 seconds minimum setting
Memory Capacity
5-1/2 hours continuous logging every 5 s.
or 33 logged PI tests
or 350 logged IR tests
Industry-Standard Tests
MIT515: IR, IR(t), DAR, PI
MIT525 & MIT1025: IR, IR(t), DAR, PI, SV, DD, Ramp Test
Interface
USB type B (device)
Real Time Output
USB, 1 reading/second (voltage, current and resistance)
Interference Rejection
MIT515 & MIT525: 1 mA per 250 V up to a maximum of 3 mA
MIT1025: 1 mA per 600 V up to a maximum of 3 mA
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Fig. 1: Quality insulation testers exhibit fast voltage rise
times to resistance levels commensurate with minimum
acceptable values, and maintain selected voltage
throughout the remaining measurement range. Below an
acceptable level of resistance, rapid voltage drop protects
the test item from exposure to high voltage, so that it may
be reclaimed by appropriate maintenance.
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MIT515, MIT525, MIT1025
5-kV and 10-kV dc Insulation Resistance Testers
Product comparison guide.
A look at each instrument’s features.
Model Number
Display
Power Supply
MIT515-US
MIT525-US
MIT1025-US
Analog/Digital
n
n
n
Line power
n
n
n
Rechargable
n
n
n
10.0 kV
Test Voltage
n
5.0 kV
n
n
n
2.5 kV
n
n
n
1.0 kV
n
n
n
500 V
n
n
n
250 V
n
n
10 V steps 50 V to 1 kV
25 V steps 1 kV to max. test voltage
n
n
10 V steps 100 V to 2.5 kV,
25 V steps 2.5 kV to max. test voltage
Measurements
Test Types
n
Max. reading
10 TΩ
10 TΩ
20 TΩ
Min. reading
10 kΩ
10 kΩ
10 kΩ
Voltage
n
n
n
Capacitance and time constant
n
n
n
Leakage current
n
n
n
Auto IR
n
n
n
Auto PI
n
n
n
Auto SV
n
n
Auto DD
n
n
n
n
n
n
Auto DAR
n
Ramp test
Other Features
CAT IV 600 V safety rating
n
n
n
Timer control
n
n
n
Timer display
n
n
n
3mA test currents
n
n
n
USB output (cable included)
n
n
RS232 output (cable included)
n
n
Calibration certificate included
n
n
n
IP65 rating
n
n
n
Alarm limit mode
n
n
n
n
n
n
n
Temp. recording (manual entry)
n
n
Real time clock
n
n
2.5
2.5
2.5
Noise rejection
3mA
3mA
3mA
Guard terminal performance
2% error guarding 500 kΩ leakage with a 100 MΩ load
Compatible with PowerDB
User programmable lock voltage range
Battery charge time (hours)
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n
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MIT515, MIT525, MIT1025
5-kV and 10-kV dc Insulation Resistance Testers
Model MIT1025 Panel
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MIT515, MIT525, MIT1025
5-kV and 10-kV dc Insulation Resistance Testers
These unique features improve insulation testing efficiency and effectiveness
Large backlit LCD
shows multiple
parameters
simultaneously.
ORDERING INFORMATION
Item (Qty)
Cat. No.
MIT515-US1001-936
MIT525-US1001-940
MIT1025-US1001-944
Included Accessories
User guide CD
Power lead
10 ft (3 m) leadset x 3, medium insulated clips
1002-531
10 ft (3 m) 3 m leadset x 3, large insulated clips
(MIT1025 only) 1002-534
CATIV 600V rating on ALL terminals.
Included Accessories (MIT525, MIT1025)
USB cable 25970-041
PowerDB Lite software Optional Accessories
Rotary switch operation for intuitive field use.
CB101, 5 kV Calibration Box
6311-077
Calibration Certificate - CB101
1000-113
10 ft (3 m) Control circuit test leads
6220-822
33 ft (10 m) x 3, medium insulated clips
1000-441
50 ft (15 m) x 3, medium insulated clips 1000-442
33 ft (10 m) x 3, large insulated clips
1000-443
50 ft (15 m) x 3, large insulated clips
1000-432
10 ft (3 m) leadset x 3, bare clps
8101-181
26 ft (8 m) leadset x 3, bare clips
8101-182
50 ft (15 m) leadset x 3, bare clips
8101-183
50 ft (15 m) 5 kV screened uninsulated small clips 6311-080
High quality flexible silicon insulated test leads
with test clips meet IEC 61010. (Large clips shown.)
10 ft (3 m) 10 kV screened uninsulated small clips 6220-834
33 ft (10 m) 10 kV screened uninsulated small clips 6220-861
50 ft (15 m) 10 kV screened uninsulated small clips 6220-833
Easy-to-read rotary test
selection button includes
IR, IR(t), DAR, PI, DD, SV
and Ramp Test.
UK
Archcliffe Road, Dover
CT17 9EN England
T +44 (0) 1 304 502101
F +44 (0) 1 304 207342
UKsales@megger.com
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UNITED STATES
2621 Van Buren Avenue
Norristown, PA 19403 USA
T 1 866-254-0962 (USA only)
T +1 610-676-8500
F +1 610-676-8625
VFCustomerSupport@megger.com
(case sensitive email address)
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OTHER TECHNICAL SALES OFFICES
Dallas USA, College Station USA,
Sydney AUSTRALIA, Täby SWEDEN,
Ontario CANADA, Trappes FRANCE,
Oberursel GERMANY, Aargau
SWITZERLAND, Dubai UAE, Mumbai
INDIA, Johannesburg SOUTH AFRICA,
and Chonburi THAILAND
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ISO STATEMENT
Registered to ISO 9001:2000 Reg no. Q 09250
Registered to ISO 14001 Reg no. EMS 61597
MIT515_525_1025_DS_US_V02
www.megger.com
Megger is a registered trademark
Information contained herein is
subject to change withot notice
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