Megger MIT 525 5 kV High Voltage Insulation Resistance Tester MIT-525

Description

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The Following Items Are Included:
Megger MIT 525 5 kV Insulation Resistance Tester (BC# 39920-L/T*)
(3) Megger Test Leads w/ Clamps
Power Cord
USB PC Interface Cable
User Manual On CD-ROM
Integrated Hard Case w/ Accessory Case
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This Item Has A Current Calibration!
Megger MIT 525 5kV Insulation Resistance Tester
Preconfigured diagnostic tests include Polarization Index (PI), Dielectric Absorption Ratio (DAR), dielectric discharge (DD), Step Voltage (SV) and ramp test
This unit is particularly informative on polyester, asphalt and epoxy-mica insulations
Includes Integrated Hard Carrying Case & Accessories As Listed Above!
Working Condition: Excellent
Condition: Refurbished
Calibrated: Yes
Warranty: 1 YEAR WARRANTY
Megger MIT525 Insulation Resistance Tester
Megger’s MIT525 DC insulation tester is targeted at original equipment manufacturers and industrial companies. MIT525 has a full suite of test modes as well as onboard memory and the ability to stream data/download data to a PC/laptop.
Instrument productivity is a focus of the new MIT range which offers rapid charge batteries and operation from an AC source if the batteries are dead. Rapid charge batteries enable > 60 minutes testing after a 30 minute charge.
Safety is not compromised on the MIT range with all terminals rated to CATIV 600 V to 3000 m (5 kV).
The MIT range share dual case design which includes a tough outer case to protect the tester from knocks/drops and an inner fire retardant case. The IP rating is IP 65 case closed eliminating moisture and dust ingress.
An intuitive user interface ensures no lost time remembering how to use the tester. Simplicity of operation is achieved with two rotary switches and the large backlight display which enables multiple results to be displayed simultaneously. A graphical quick start guide is provided inside the lid to assist first time users.
Five preset voltage ranges are provided in insulation test mode, plus a user settable lock voltage range. Voltage can be selected in 10-V increments to 1 kV and 25-V increments above 1 kV. 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. Graphs can then be downloaded, or streamed real time (Must purchase optional software). Graphs can then 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. This unit is particularly informative on polyester, asphalt and epoxy-mica insulations. They can also test voltage suppression devices.
Advanced memory storage includes time/date stamping of results, logging of data and recall of results to screen. A fully isolated USB interface is used for safe transfer of data to Megger’s asset management software; PowerDB Pro, Advanced and Lite packages.
Test leads are double insulated with clamps rated at 3 kV equivalent to 6 kV single insulation for the medium clip leadset and 5 kV equivalent to 10 kV single insulation for the large clip.
Features:
Insulation resistance up to 10 TΩ @ 5 kV enables installation testing and long-term trending of higher value apparatus, typically above 1 TΩ.
High altitude operation up to 3000 m while maintaining CATIV 600 V (5 kV).
5% accuracy all the way up to 1 TΩ @ 5 kV ensures highest accuracy where it matters most. Note: the majority of measurement in substation environments are typically above 100 GΩ.
IR, timed IR, DAR, PI, DD, SV and ramp tests maximize diagnostic testing capability
3 mA short circuit current with unique max power regulations technology ensures maximum transfer whatever the load until selected voltage is reached.
Noise filter rejects up to 3 mA (5 kV) noise for effective operation in electrically noisy environments.
Li-ion battery allows up to 6 hrs continuous testing @ 5 kV with a 100 MΩ load; battery meets IEC 62133
Large backlit LCD, convenient for use in ambient lighting, clearly shows analog and digital readings.
Dedicated voltmeter function (30 V to 660 V) allows the user to check for induced volages.
Smaller size and lighter weight allows easier transport and use without compromising performance.
Unique dual case design allows for fire-retardant protection while maintaining ruggedness.
High-quality, flexible silicon test leads meet safety regulations of IEC 61010-31:2008 while ensuring measurement accuracy.
Timed IR plus PI, DAR, DD, SV and ramp tests maximize diagnostic testing capability
Operate from line power even if the battery is 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.
Industry best guard terminal performance to insure highest accuracy of measured values.
Enhanced driver technology provides plug-and-play when connected to the internet. No tedious and potentially interruptive setup procedures.
Rotary switch operation for easy, intuitive field use
Locking test leads provide additional safety
Date and time-stamped test results reduce the risk of error in result interpretation.
Applications
The Insulation Resistance (IR) test is a quantitative test which indicates the effectiveness of a product’s electrical insulation. Applications include cables, transformers, motors/generators, circuit breakers and bushings.
The units are designed for testing the insulation of high-voltage electric equipment. Their wide voltage range also allows applications for low-voltage equipment. The test techniques on the instruments provide valuable diagnostic information.
All four instruments test the insulation resistance of:
High-voltage power cables and high-voltage buses
Large motor/generator windings
Line and substation transformers
The MIT525 also performs spot tests, step voltage tests, dielectric discharge tests, ramp tests, and dielectric absorption tests for the following applications:
Acceptance testing at installation to check conformance to specifications.
Routine preventive/predictive maintenance testing after installation
QA testing as part of the manufacturing process
Diagnostic testing to isolate faulty components for repair.
Specifications:
Voltage input range:
5 kV
90-264 V rms, 47-63 Hz, 100VA
Battery:
11.1 V, 5.2Ah Li-ion batteries, meet IEC 62133:2003
Battery life MIT515
6 hours (typical) continuous testing at 5 kV with a 100 MΩ load
Battery charge time:
2.5 hours from deep discharge, 2 hours normal discharge
Test voltages MIT515
250 V, 500 V, 1000 V, 2500 V,5000 V, VL
Lock test voltage VL:
40 V to 1 kV in 10 V steps,
1 kV to 5 kV in 25 V steps,
Voltage o/p accuracy:
+4%, -0%, ±10 V nominal test voltage at 1GΩ load (0°C to 0°C)
Resistance Range:
10 k to 10 TΩ @ 5 kV
Accuracy (23 °C) from 1 MΩ to:
±5% to 1 TΩ, ±20% to 10 TΩ
Centrally positioned guard ring:
Guard parallel leakage, resistance down to 250 kΩ with a maximum additional resistance error of 1% with a 100 MΩ load.
Display range analog:
100 kΩ to 10 TΩ
Display range digital:
10 kΩ to 30 TΩ
Short circuit current:
3 mA @ 5 kV, 10 kV, 15 kV
Insulation alarm:
100 kΩ to 10 GΩ
Capacitor charge:
< 3 s/μF to 5 kV, < 5 s/μF to 10 kV, < 7.5 s/uF to 15 kV
Capacitor discharge:
5 kV to 50 V :< 120 ms/μF
Capacitance range (> 500 V):
10 nF to 50 μF (dependent on measurement voltage)
Capacitance accuracy (23 °C):
±10% ±5 nF
Current measurement range:
0.01 nA to 6 mA
Current measurement accuracy:
±5% ±0.2 nA at all voltages (23 °C)
Interference (noise) rejection:
3 mA from 450 V to 5 kV
Voltmeter range:
30 V to 660 V ac or dc, 45Hz – 65Hz
Voltmeter accuracy:
±3%, ±3V
Timer range:
Up to 99 minutes 59 seconds, 15 second minimum setting
Memory capacity:
5.5 hours logging @ 5 sec intervals
Test regimes:
IR, IR(t), DAR, PI, SV, DD, ramp test
Interface:
USB type B (device)
Real time output:
1 Hz output readings (V, I, R)
Environmental
Altitude:
3000 m
Operating temperature:
-4° F to +122° F (-20° C to 50° C)
Storage temperature:
-13° F to +149° F (-25° C to 65° C)
Humidity:
90% RH non-condensing at 40 °C
Ingress protection:
IP65 (lid closed), IP40 (lid open)
Safety
CAT Rating:
CATIV 600 V to 3000 m (5 kV, 10 kV) CATIV 1000 V to 3000 m (15 kV)
EMC:
Meets the requirements of IEC 61010-1 and IEC61326-1
Dimensions
MIT525
12 in. L x 11 in. W x 7 in. H
(315 mm L x 285 mm W x 181 mm H)
Weight
10 lb (4.5 kg)
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