MIT1525 15 kV Industrial Insulation Tester - panel meterspanelmeters.weschler.com/Asset/Megger-Sales...

Megger Instruments Limited

MIT1525 15 kV Industrial Insulation Tester

NEW PRODUCT LAUNCH

SALES GUIDE

Megger Instruments Ltd. of 19 Product Launch Sales Guide MIT1525 Jan 2014

Copyright© 2014 Megger Instruments Limited, Archcliffe Road, Dover CT17 9EN

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SALES GUIDE CONTENTS

MIT1525 SUMMARY .................................................................................................................... 4

MIT1525 SALES MESSAGE AND STRATEGY ......................................................................... 5

NEW MIT1525 15kV INSULATION RESISTANCE TESTER FEATURES .................................... 8

PRODUCT FAMILY SPECIFICATIONS ....................................................................................... 9

BENEFITS OF 15 kV INSULATION TESTING WITH MIT1525 FOR INDUSTRIAL & OEM CUSTOMERS ............................................................................................................................ 10

PRODUCT USAGE .................................................................................................................... 14

CUSTOMERS ............................................................................................................................ 15

TECHNICAL OVERVIEW ........................................................................................................... 15

ORDERING INFORMATION ...................................................................................................... 19



MIT1525 Industrial tester

MIT1525 SUMMARY

Key features at a glance

15 kV max. test voltage

6 mA noise rejection – 3 mA S/C current

Safety: CATIV 1000V rated to 3000 m

Always ready to test – Dual Li-ion batteries or AC supply

Ease of use – rotary switches point to function and mode required

Convenient, safe remote control operation

Flexible - VLLLL , change timer settings, record temperature with results

Target Customers

Industrial companies • Installation • Commissioning • Maintenance • Repair

OEMs • Motor / generator

manufacturers / repairers • Transformer manufacturers • Cable manufacturers

Electrical service companies • Installation • Commissioning • Maintenance • Repair

Renewable source operators • Wind • Solar • Biomass • Hydro

Applications

Testing to NETA standards requiring 15 kV test voltage: (NETA ATS 2007. Section 7.15.1) 34 500 V and above for motors/generators and equipment rated above 35 kV (PEARL Reconditioning Standard/NETA MTS-1997 Table 10.1).

Commissioning new installations Transformers Circuit breakers Current transformers Cable testing Detecting insulation damage caused

during installation / transportation Remote control insulation resistance

testing Regular maintenance testing:

• Switchgear • Motors • Generators • Cables • HV Installations • Transformers • CTs • Circuit breakers



MIT1525 SALES MESSAGE AND STRATEGY

The current Megger MIT range of 5 kV and 10 kV range was launched in May 2012 building on a success story of experience and innovation. Since then the success has continued building a huge customer base just like their predecessors. Over the years customer have summed up their reasons to buy as, “We buy these instruments because they work!”. The latest range has proven to be an unrivalled combination of testing performance, simplicity to use, toughness, reliability and convenient small size and light weight. Megger is now the first company to develop an instrument that combines all of these attributes with a 15 kV output. The MIT advertising tag lines

Megger – the name in insulation testing (used in April 2012 launch) Or Works where ever you work – and now in applications that require 15kV

With new developments in insulation material technology the trend is moving towards the use of higher test voltages, indeed Megger has seen a big increase in 10kV instrument sales over the last 3 years. Apart from the obvious benefits of increasing test voltage relating to the increase in test current, higher test voltage requirements have appeared in a number of standards, notably 10 kV in IEEE43 :2000. However 15 kV is now in demand as engineers experience earlier degradation detection and better fault detection on high voltage equipment. Many power utilities in South America have already incorporated 15 kV testing into their procedures and this trend is now spreading into Europe, Middle East and Asia. In the US NETA standards specify 15 kV. The NETA Pearl reconditioning standard / NETA MTS-1997 specifies 15 kV testing on equipment with a maximum voltage rating of 35 kV and above. Motors tested to NETA ATS 2007 with 34,500 V or above on their name plate also require testing at 15kV. Introducing the complete MIT industrial insulation tester range - now four models 5 kV to 15 kV DC

MIT515 : 5 kV IRT with PI and DAR but no memory MIT525 : 5 kV IRT with all test modes including a ramp test plus advanced memory functions with recall to screen, RTC for time/date stamp of results and USB cable interface to PC/PowerDB MIT1025: 10 kV IRT with all test modes including a ramp test plus advanced memory functions with recall to screen, RTC for time/date stamp of results and USB cable interface to PC/PowerDB

MIT1525: 15 kV IRT with all test modes including a ramp test plus advanced memory functions with recall to screen, RTC for time/date stamp of results and USB cable interface to PC/PowerDB. CATIV1000V, 3000m altitude.



Sales strategy Megger recommends the following approach to promoting sales of the new MIT1525. Remember the MIT range of 5, 10 and 15 kV instruments is ideal for Industrial customers, and can be used at Power utility distribution voltage environments.

• 15 kV up sale route – in particular any customers interested in the MIT1025 will enjoy the following benefits

1. Improved fault detection and earlier degradation identification on equipment rated at 35 kV and above, and motors at 34.5 kV and above

2. Future proofing of test capabilities 3. Noise immunity – 6 mA. Note: the MIT does not have averaging filters to

remove low frequency variation 4. Higher 30 TΩ range at 15 kV – detect degradation even earlier 5. Better accuracy at high IR values, such as those regularly experienced on

some extra high voltage equipment – ± 5% maintained to 3 TΩ at 15 kV, 10 kV instruments maintain ± 5% to 2 TΩ, 5 kV instruments maintain ± 5% to 1 TΩ

6. Ability to safely test at much higher altitude – 3000 m with maintained CATIV 1000 V safety rating

7. Higher CATIV 1000V safety rating relates to testing environments before the incoming service entrance on buildings. 1000 V relates to the phase to earth voltage rating of equipment

• Presenting the MIT1525 to Power Utility distribution maintenance departments that are:-

1. Responsible for the maintenance of any equipment rated at 35 kV and above. 2. Currently using 10 kV insulation testers

• Presenting the MIT1525 to Industrial companies that are:- 1. Involved in the installation, commissioning, maintenance, or repair of any

equipment rated at 35 kV or above, and motors at 34.5 kV and above. 2. Currently using 10 kV insulation testers

• Presenting the MIT1525 to OEMs that are:-

1. Manufacturing motors rated at 34,500 kV or above 2. Manufacturing transformers rated at 35 kV or above 3. Manufacturing switch gear rated at 35 kV or above 4. Manufacturing circuit breakers rated at 35 kV or above 5. Manufacturing HV cables 6. Currently using 10 kV insulation testers



PRODUCT INTRODUCTION

The quick start is diagrammatic and simple to follow

Mains/line power or battery operation keeps you testing

Designed to IEC 61010, all terminals safety rated CATIV1000 V

Large LCD backlit display shows analogue and digital display

Streaming data to a laptop running PowerDB

New 15 kV 3 x 3 m leadset supplied as standard



NEW MIT1525 15kV INSULATION RESISTANCE TESTER FEATURES

DIY battery

replacement

6 mA noise

rejection

PRODUCTIVITY

or

Li-ion

battery

NOISE

REJECTION

SAFETY

DATA

STREAMING

BATTERY

CHANGE

MEMORY

2711

18 Apr

2013

+

5.5 hours @ 5 s intervals

MIT1525CAT IV 1000 V to 3000 m



PRODUCT FAMILY SPECIFICATIONS Feature MIT515 MIT525 MIT1025 MIT1525

Output voltage maximum (kV) 5 5 10 15

Resistance range max 10TΩ 10TΩ 20TΩ 30TΩ

Line Power

Battery Power

Battery life - (h) 6 6 4.5 4.5

Battery charge time (h max) 2.5 2.5 2.5 2.5

Weight - no leads (kg) 4.5 4.5 4.5 6.5

Size (cm) 32x29x18 32x29x18 32x29x18 36x31x20

Digital/Analogue display

Display Backlight

Voltage output measurement

Dedicated voltmeter

Voltmeter function

Accuracy from 1 MΩ to ±5%≤1TΩ

±20% to

10TΩ

±5%≤1TΩ

±20% to

10TΩ

±5%≤2TΩ

±20% to

20TΩ

±5%≤3TΩ

±20% to

35TΩInsulation

Short circuit current 3 mA 3 mA 3 mA 3 mA

Auto IR, IR(t)

Auto PI, DAR

Auto DD

Auto SV, Ramp Test

Breakdown detection

Burn mode

Elapsed Test indic. 99 mins

Programmable test duration 99 min 99 min 99 min 99 min

Capacitance measurement

Time Constant display

Real time data output

Data Storage

Variable test voltage

Lock voltage range

Software filtering

Insulation Alarms

USB interface

Bluetooth® interface

Remote Control

Real Time Clock

Power DB Lite

Temp. recording

Relative humidity recording

Filters 10 s, 30 s, 100 s, 200 s

Noise rejection 3 mA 3 mA 3 mA 6 mA

Altitude 3000 m 3000 m 3000 m 3000 m

CAT IV 600V

CAT IV 1000V

Guard terminal



BENEFITS OF 15 kV INSULATION TESTING WITH MIT1525 FOR INDUSTRIAL & OEM CUSTOMERS MIT1525 – A versatile performer with 15 kV test voltage

• The new MIT1525 15 kV DC insulation testers are equally well suited for motor / generator production and repair as they are for low and medium voltage substation use. Transformer OEMs and repairers will benefit from the 15 kV test voltage and the extensive capabilities of the MIT1525.

• A full suite of test modes for rotating machinery with preset IEEE 43 and IEEE 95 standard timings are selectable via the mode switch. Timings can be adjusted if required by the user with the central rotary switch pointing at the settings position. Tests modes include basic IR, auto-timed IR test, PI, DAR, Dielectric Discharge, Step Voltage and ramp tests.

• Features include user settable voltage range, test mode timer adjustments, logging entire tests or saving summary results with time/date stamp, plus the ability to record temperature measured by an independent thermometer via an on-screen prompt at the end of a test.

• The graphical quick start guide in the product lid enables first-time users to operate the unit without the need to refer to the user guide.

Always ready to test

• Continuous operation on battery for 4 hours.

• With a flat battery a 30 min charge will power the unit for up to 90 minutes continuous testing.

• Alternatively, use an AC source to power the instrument. Continuous / repetitive measurement capability

• Automation in factory testing via remote control can improve test throughput and ensures integrity of results streamed in real time to the controlling PC.

• The ability to remotely control intervals between IR tests is beneficial wherever repetitive resistance testing is required, e.g. subsea cable laying or factory based testing of cables under varying temperature and pressure.

Operator Safety

• The MIT1525 is safety rated to CATIV 1000V up to 3000 m.

• Safety on the shop floor is paramount and the ability to remotely start/stop tests, in caged environments for example, benefits personnel who do not have to enter the cage at any stage during the test.

• Data streaming via USB cable records results every second to PowerDB, Megger’s asset management system platform.

Low cost of ownership

• User replaceable batteries

• Rugged case and internal mouldings protect against product failure

• Minimal cables used internally improve reliability



MIT1525 Unique Selling Points

Customer benefit provided Enabling feature(s)

Longest battery service life plus fastest battery charge time

Lithium Ion battery technology

Best battery tolerance to ambient heat

The majority of substation measurements fall in the range from 100 GC to 1 TΩ range. The MIT1525 provides a high level of accuracy throughout important area.

Accuracy where it matters most

± 5 % accuracy from 1 MΩ to 30TΩ at 15 kV

Fastest battery charge time

Fully charge battery in typically 2 hours

Over 1 hour continuous testing from

only a 30 minute charge

Get an afternoon’s testing following a short lunch break worth of charging

No AC supply at the test location? No extension leads available? Then take the lightweight unit somewhere to fast charge

When using the guard terminal to remove the effects of surface leakage, it’s performance is part of the measurement uncertainty

High performance Guard terminal specification

“2% error guarding 500 kΩ leakage with 100 MΩ load”

Confidence in measured values when using the guard terminal

Confidence in instruments ruggedness and ability to protect inner case fire retardant protection

Dual case construction

Fire retardant inner case, extra tough outer case

Confidence in instrument safety

Confidence in instrument safety Additional safety when testing long cables. Less chance of accidental test lead disconnection resulting in a capacitance not being safely discharged.

Test lead locks into instrument terminal Plugs lock into instrument



MIT1525 Distinctive Selling Points

Customer benefit provided Enabling distinctive feature(s)

Easy to store and carry and able to perform stable high accuracy insulation measurements

No compromise superior insulation resistance test performance

Easy to use Minimum time required for user to familiarise themselves with the instrument Can see exactly what the instruments function are on the front panel

Rotary range switch operation

Simple quick start label in lid


CATIV 1000V rating is on ALL terminals

1000V protection on terminals

Operates at high altitude and still maintains high level of operator safety

Operate up to 3000m altitude CATIV 1000V rating maintained

Additional safety when testing long cables. Less chance of inadvertence test lead disconnection resulting in a capacitance not being safely discharged.

Test leads with non-removable test clips


High quality flexible silicon insulated test leads with test clips insulated to latest

edition of IEC 61010-031. i.e. Touch proof with clip closed



MIT1525 Distinctive Selling Points …. continued

Customer benefit provided Enabling distinctive feature(s)

Always ready to test

Can test from AC supply even with completely flat battery

Functional earth point must be connected at

all times

Compliance with IEEE 43:2000 which recommends test voltage up to 10 kV 10,000 V test voltage option

15,000 V test voltage option NETA recommendation for rotating machinery above 34500 V is IR testing at 15 kV

Select your specific test voltage

User set test voltage lock range

Rapid charging of capacitance, such that found on long cables

MIT1525 has 3 mA short circuit current capacity with

New Max Power Regulation technology

Ensures maximum power transfer whatever the load up to 15 kV

Maintain test voltage even when high levels of surface leakage are present for example

Checking generated frequencies Dedicated voltage meter range with frequency (Hz) measurement Check for induced voltages

Obtain accurate measurements even in a range of electrically noisy environments from industrial locations to distribution substations

Noise immunity, specified at 6 mA

Identify test results and know exactly when they were performed.

Date and time stamped stored test results

These instruments work in tough conditions, it takes a tough instrument to survive

Tough case with high IP65 rating with lid closed

Easy to replace USB and AC supply cable Standard USB and IEC AC cable

No need for user to send to a service agent to replace battery

User changeable battery

No need to recalibrate IR ranges following battery replacement

No need to recalibrate on screen battery charge life indication following battery replacement



PRODUCT USAGE Insulation testers form an integral part of testing in the electrical power industry and the new 15 kV insulation testers are designed to provide the highest performance, intuitive operation, tough outer case, light weight, high productivity and a full set of automatic test modes. Insulation resistance testing can be summarised as:

Measuring numerous assets HV switchyards, e.g. CTs, circuit breakers, transformers, isolators and cables

Checking new equipment for insulation damage that may have happened during

transportation to site or on installation Checking for wiring errors prior to the initial power up of a new asset

Verifying an existing installation / equipment following repair

Predictive maintenance testing, looking for downward trends in insulation values to

aid assessment of an asset’s expected lifetime. Here are a few applications suited to the new MIT1525:

OEM electrical manufacturers/repairers Testing switches, connectors and relays Cables Motors Generators Transformers

Wind turbine farms

Transformers Power drives Cables

Industrial plant

Transformers Motors Cables

Railway / Railroad Industry

Traction motors Locomotive transformers

Raw material processing, e.g. cement plants HV power supply installation Motors



CUSTOMERS

Electrical Maintenance Companies

Industrial/OEM Companies

Motor and generator manufacturers

Wind turbine manufacturers

Wind turbine installation contractors

Process Control Plants

University / Colleges

Railways

Defence / Government

TECHNICAL OVERVIEW The new MIT1525 insulation tester has a top end specification. It has a full suite of test modes, advanced memory with time/date stamp and the ability to record temperature (measured with independent thermometer) and on-board storage with a capacity to log up to 5.5 hours of data saved every 5 seconds. Downloading of saved results, logs and real-time streaming of results is possible via a USB cable interface. The 15 kV test voltage is an important feature enabling customers to measure motors and generators above 34500 V (NETA ATS 2007. Section 7.15.1) and equipment rated above 35 kV (PEARL Reconditioning Standard / NETA MTS-1997 Table 10.1).

Insulation test output

MIT1525: preset voltages are 1000 V, 2500 V, 5000 V, 10000 V, 15000 V and a user settable ‘lock’ voltage from 40 V to 15 kV; voltage outputs are adjustable using up/down arrow buttons and are specified within the range -0% to +4%.

Current output into a short circuit is 3mA

The MIT1525 features new Max Power Regulation technology to achieve the quickest

possible voltage ramp when the test starts.

Noise rejection is 6 mA on the MIT1525 enabling readings in high voltage substations Note that there are no averaging filters to remove VLF variation



Insulation resistance ranges

Digital : 30 TΩ @ 15 kV for MIT1525 Analogue : 10 TΩ

The insulation measuring ranges have been chosen as a result of extensive feedback obtained from the industrial user. In these environments higher TΩ ranges tend to be heavily influenced by ambient conditions.

Insulation resistance accuracy

MIT1525, ± 5% from 1 MΩ to 3 TΩ, ± 20% to 30 TΩ

The new MIT1525 has been designed to provide the accuracy where it matters most. High insulation measurements fall in the 100 GΩ to 500 GΩ range, with a few readings reaching 1TΩ. The measurement accuracy is most important in this range. For this reason the new MIT1525 15 kV insulation tester provides ± 5% accuracy from 1 MΩ to 3TΩ.

Insulation test modes

Basic IR test Timed (auto-stop) IR test DAR PI DD SV Ramp

Diagnostic tests in summary:-

Dielectric Absorption Ratio (DAR)

Short version of PI test, typically with readings taken at 30 second and 1 minute Can be performed with other test times Used on thin, low absorption insulation

Polarization index test

Readings taken at 1 minute and 10 minutes. PI = R10m / R1m PI value - generally above 2 is okay and > 4 is good Detection of damp or contaminated insulation

Dielectric Discharge (DD)

Measures the discharge currents 60 seconds after an insulation test has been completed

Reabsorption current at 60 seconds indicates insulation condition Slow reabsorption points to a problem The DD value = Current flowing after 1 minute (mA)

Test Voltage (V) x Capacitance (F) DD value generally less than 2 is acceptable Used to show up single layer of poor insulation



Step Voltage Test (SV)

Increase voltage in steps (usually 5 steps) Test voltage constant between steps for about 60 seconds Insulation reading should remain constant Any marked or unusual resistance reduction is an indication of weakness. Shows up cracked or dry insulation

Ramp Test

Test voltage is gradually increased (ramped up) to a final

voltage level Advantage over step voltage is that the ramp test is less

likely to result in unpredictable damage due to the sudden large increase in test voltage experienced in the step voltage test. In addition the ramp test allows the user to separate the leakage current from the capacitive and polarisation currents. This means small defects in insulation can be detected more easily.

As the voltage is increased the insulation leakage current is graphed and continuously monitored during the test. Should a sudden increase in leakage current be observed the operator has the opportunity to terminate the test before a full breakdown occurs, potentially damaging the insulation.

The ramp test is specified in IEEE 95-2002, The IEEE Recommended practice for insulation testing of AC electric machinery (2300 V and above) with high direct voltage.

IEEE 95-2002 recommends a slow and continuous increase of test voltage of typically 1kV per minute. (the 15 kV insulation testers default to this rate)

Comparing the resulting current curve with the example curves in IEEE 95-2002 allows detection of various faults.

T

he TThe Bureau of Reclamation recommends the use of the DC Ramp test on a wide range of machines with polyester, asphalt and epoxy-mica insulations

Another possible application for the ramp test is to test voltage suppression devices by monitoring the applied voltage at a specified current.

During this test measurements on the MIT1526 may be streamed live to a PC via a

USB cable to the supplied Power DB Lite software. The current curve is plotted live in Power DB Lite during the test allowing the user to monitor progress as recommended by IEEE95-2002.

Typical normal ramp test result

0

1

2

3

4

5

6

7

8

0 2 4 6 8 10

Applied test voltage (kV)

Test

cu

rre

nt

(uA

)

Typical ramp test showing moisture insgress

0

1

2

3

4

5

6

7

8

0 2 4 6 8 10

Applied test voltage (kV)

Test

cu

rre

nt

(uA

)



Voltage measurement / detection:

Dedicated voltmeter function; 30 V to 660 V DC or AC with frequency (45 Hz to 65 Hz), used as a safety feature to check for induced voltages

Voltmeter display shown in resistance test modes as a warning of live voltage if a voltage 50 V or above is detected at the terminals

Guard Terminal:

An important feature of any IRT is the performance of the Guard terminal specified as; 2% error guarding 500 kΩ leakage with 100 MΩ load

When in use the guard terminal performance is part of the measurement uncertainty therefore it is important to provide a specification for this function.

The guard terminal is an important tool to avoid low insulation resistance values caused by the effects of leakage currents

User Safety

MIT1525 is safety rated at CATIV 1000V The CATIV 1000V rating is maintained to an altitude of 3000 m Some utilities specify CATIV as for use on their distribution network

Operating Temperature Range

The operating temperature range is -20 ºC to + 50 ºC In summary the new MIT1525 kV insulation testers are ideal for industrial companies and OEMs.



ORDERING INFORMATION

Description Model Part Number

MIT1525-UK 1002-907

MIT1525-EU 1002-908 MIT1525-US 1002-909 MIT1525-AU 1002-910

A 3 x 3 m 15 kV leadset is available including shielded test leads for use in especially high noise environments.

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