Atec Megger-MIT515 - Manual

MIT515, MIT525, MIT1025
5-kV and 10-kV Insulation Resistance Testers
n Industry best guard terminal accuracy
n Compact and lightweight for easy
transport and use
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PI, DAR, DD, SV and ramp test
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Unique dual case design provides
additional user protection
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Lithium-ion battery - extended capacity,
rapid charge
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Advanced memory with time/date stamp
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CATIV 600 V safety rating on all terminals
MIT515, MIT525, MIT1025
5-kV and 10-kV dc 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.
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 contractors
■■■ Testing and service companies
■■■ Wind farm and solar generation operators
■■■ Power generation and distribution companies
■■■ Industrial companies
■■■ Rail companies