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Insulation Testing & Continuity

DC Diagnostic Insulation Testers

Regular insulation resistance testing is one of the most cost effective, non-destructive methods of identifying ageing in electrical equipment. With over 60% of equipment failures being ascribed to insulation breakdown, it is a key area to monitor. Diagnostic DC testing is probably the easiest and most convenient method of achieving this due to the small size and weight of the equipment.

5 kV utility insulation resistance tester S1-568

With exceptionally high noise rejection, the fast charging S1-568 offers the full gamut of automatic insulation tests with 8 mA of noise rejection, IR, timed IR, polarisation index (PI), dielectric absorption ratio (DAR), programmable Step Voltage (SS), Dielectric Discharge (DD) and ramp. The S1-568 allows the operator to control the test remotely from a computer using the 10 kV isolated USB port, to store the date and time stamped results on board or to download them in real time using Bluetooth. This is the perfect tester for the itinerant contractor as it will give results in any electrical environment.

15 kV utility insulation resistance tester S1-1568

A maximum resistance measurement of 35 TΩ and 15 kV test voltage are additional features of this instrument, which displays the same exceptionally high noise rejection as the other testers in the series. Diagnostic tests available include IR, timed IR, polarisation index (PI), dielectric absorption ratio (DAR), Step Voltage, Dielectric Discharge and ramp testing as automatic tests. The results are time and date stamped and stored on board or they can be downloaded in real-time.

10 kV utility insulation resistance tester S1-1068

With a full 8 mA of noise rejection and 4 levels of filtering the fast charging S1-1068 obtains meaningful results in extremely hostile environments. Offering the full gamut of automatic insulation tests, IR, timed IR, polarisation index (PI), dielectric absorption ratio (DAR), Step Voltage, Dielectric Discharge and ramp, the S1-1068 allows the operator to control the test remotely from a computer using the 10 kV isolated USB port, to store the date and time stamped results on board or to download them is real time using Bluetooth. This is the perfect tester for the itinerant contractor as it will give results in any electrical environment.

10 kV utility insulation resistance tester S1-1068

With a full 8 mA of noise rejection and 4 levels of filtering the fast charging S1-1068 obtains meaningful results in extremely hostile environments. Offering the full gamut of automatic insulation tests, IR, timed IR, polarisation index (PI), dielectric absorption ratio (DAR), Step Voltage, Dielectric Discharge and ramp, the S1-1068 allows the operator to control the test remotely from a computer using the 10 kV isolated USB port, to store the date and time stamped results on board or to download them is real time using Bluetooth. This is the perfect tester for the itinerant contractor as it will give results in any electrical environment.

15 kV utility insulation resistance tester S1-1568

A maximum resistance measurement of 35 TΩ and 15 kV test voltage are additional features of this instrument, which displays the same exceptionally high noise rejection as the other testers in the series. Diagnostic tests available include IR, timed IR, polarisation index (PI), dielectric absorption ratio (DAR), Step Voltage, Dielectric Discharge and ramp testing as automatic tests. The results are time and date stamped and stored on board or they can be downloaded in real-time.

5 kV diagnostic insulation resistance tester MIT525

The MIT525 performs all the insulation tests offered by MIT515 and extends the testing capabilities to include Step Voltage, Dielectric Discharge and ramp testing. Test data can be downloaded in realtime using the 10 kV isolated USB port, or stored in the instrument’s advanced memory. Smaller and lighter than its predecessors these new testers are easier to store on a van, fit in an overhead locker on an aircraft and are more convenient to carry to the job.

DC High-voltage or Withstand Testing

40 kV test unit T99/1

The high voltage test unit is portable and powerful, able to generate a DC voltage of up to 40 kV. The T 99/1 is used for testing of cables, cable accessories, plant and installations. It can be powered from an external 12 V battery

70 kV, 120 kV and 160 kV DC dielectric test set 220000 series

220000 series provides a dependable, safe, lightweight and portable DC voltage source for testing the quality and integrity of electrical power cables, cable installations, motors, switchgear, insulators, transformers and capacitors. Each test set comes in two units, the HV unit and the controller.

Portable high voltage test set for DC voltage testing of cable and cable installations HV test set 50 kV, HV test set 80 kV and HV test set 110 kV

This range of three HV test sets is for the DC voltage testing of cables and cable installations in accordance with international standards. Each set consists of a control unit and HV unit. Because they are small and light the test sets can easily be transported and used onsite.

Portable high voltage tester HV tester 25 kV

This high-voltage generator offers a variable DC output voltage from 0 to 25 kV with an output current of 1.5 mA at the maximum voltage. It is mains or battery powered, and this combined with its low weight makes it ideal for field use. The ground safety circuit and integrated discharge enhance the operator’s safety

70 kV DC portable high voltage test system HPG70-K

A fully insulated test set for DC testing up to 70 kV, this system is ideal for stand-alone applications. The DC voltage is obtained through a bridge rectifier which ensures a very low test voltage ripple. Moreover the DC voltage is measured on the output side thus ensuring a precise output voltage. Applications include testing of cables, switchgear, current-transformers, MV plant and components.

High voltage DC test systems HVDC200, HVDC400, HVDC650 and HVDC800

HVDC test set systems are highperformance, portable testing systems that can be used to test all kinds of components of high voltage direct current transmission in line with the applicable regulations on the generation of HVDC voltages of up to 800 kV. The modular construction permits test voltages up to 800 kV; there is a choice of polarity with a DC ripple of less than 3%.

AC Insulation Testers

AC insulation testers most closely replicate the normal operating condition for a substation asset. Consequently they provide the most accurate indication of the insulation condition.

AC high voltage test system T22/1

This system is of two piece design and offers continuously variable test voltages up to 75 kV. Its performance is expandable to 150 kV AC by the addition of a second transformer. It features built-in overload protection. The test set can be equipped with a rectifier accessory for DC testing up to 80 kV.

DC and AC high voltage test system HPG50-D, HPG70-D and HPG80-D

These two unit test sets are capable of testing to 35 kV AC and 100 kV DC, 50 kV AC and 140 kV DC, and 58 kV AC and 150 kV DC respectively. These voltages are continuously adjustable with a continuous output of 1.2 kVA and up to 3 kVA for 60 minutes. The separation between the HV units and the controller units contribute to the ease of operation

DC and AC high voltage test system HPG50-H, HPG70-H, HPG80-H and HPG110-H

Designed on a two unit basis, these test sets are capable of testing to 35 kV AC and 50 kV DC, 50 kV AC and 70 kV DC, 58 kV AC and 80 kV d.c, and 78 kV AC and 110 kV d.c respectively. These voltages are continuously adjustable with a continuous output of 1.2 kVA and up to 3 kVA for 60 minutes.

100 kV 50 Hz test system HPA100AC and HPA130DC

Offering continuous testing with AC voltages up to 100 kV at 5 kVA, this is a powerful test set. The unit has been designed for mounting in cable test vans and can be used for testing of cable systems and for burning down high-resistance cable faults with a high breakdown voltage. The test set can be equipped with a rectifier accessory for DC testing up to 130 kV. The noise level of the test system is below 1%, so it is also suitable as a voltage source for PD-measurements.

12 kV AC Tan delta test system DELTA4000 series

Tough yet light and designed to work reliably in high-interference areas, like substation switchyards, Megger’s DELTA4000 series diagnostic insulation systems offer time saving fully automatic power factor/tan delta measurement and tip-up testing. Also provided are facilities for full manual control including the ability to vary the applied voltage up to 12 kV during testing to cater for special testing requirements.

AC high voltage test sets HPA35, HPA50, HPA58 and HPA78

Capable of testing to 35 kV AC, 50 kV AC, 58 kV AC, and 78 kV AC respectively, these test sets are suitable for testing items with low capacity. They are a two piece design consisting of a control unit and a resin-cast HV unit.

Low Resistance Testing

100 A highly portable micro-ohmmeter with DualGround safety DLRO100 Series

Weighing only 7.9 kg this battery and, or mains powered units bring real portability for field measurement of contact resistance to IEC62271-100. Rated at CAT IV 600 V and weather and dust proofed to IP54, these ohmmeters are tough. With a measurement range from 0.1 µΩ to 2 Ω with a resolution of 0.1 µΩ, high noise immunity and smooth dc output, the DLRO100 series includes DLRO100E, DLR0100X and DLRO100H which offers all the test modes you would expect from a true micro-ohmmeter. Additional facilities include DualGround safety, internal memory, downloading, asset labelling and remote operation, depending upon model.

Dual power 10 A micro-ohmmeter with IP rating DLRO10HD and DLRO10HDX

DLRO10HD is a tough low resistance ohmmeter which is designed to withstand the inclement conditions of real world testing. Rated at IP65 when the lid is closed and IP45 when operating under battery power, the DLRO10HD has a resolution of a 0.1 µΩ. There are also 2 power output levels to assist with condition diagnosis. One is limited to avoid heating the test sample while the other maintains a set high power output. The DLRO10HDX adds the benefit of results storage and downloading .

10 A micro-ohmmeter (with test results storage and downloading on DLRO10X) DLRO10 and DLRO10X

The DLRO10 series offer a 0.1 µΩ resolution with a maximum capability of 2 kΩ. Fast testing ability means users can achieve results in less than 3 seconds. At only 2.5 kg it is the smallest, lightest and most sophisticated 10 A low resistance ohmmeter available making it convenient for general testing. The DLRO10X has the capability of measuring inductive loads such as transformers and motor windings. The DLRO10X has on-board memory, RS232 download capability, maximum setting and manual or automatic range control to the features of the DLRO10. Uses easily interchangeable batteries. DLRO10X has real-time download of results and on-board storage for later download to a PC.

2 A low resistance ohmmeter DLRO2

DLRO2 is a tough, hand-held 2 A low resistance ohmmeter designed to provide fast, accurate and repeatable measurements, even in electrically noisy locations. For the utility or industrial user, a high level of safety is provided with a CATIII 600 V/CATIV 300 V rating to IEC61010. The instrument can also protect itself from inadvertent connections to up to 600 V without blowing a fuse. Applications requiring long test leads are not a problem for the DLRO2 as it has a dedicated long lead test to optimise the output. This makes the DLRO2 ideal for testing wind turbine and avionic lightning protection applications.

2 A bond tester BT51 (will be obsolete soon)

Low resistance ohmmeter ideally suited for bond testing applications, i.e. aircraft frames. Four terminal method of measurement ranges 0 - 20.00 mΩ and 0 - 2000 mΩ. Test current is 2A.

Clips and leads for low resistance testing

Megger has launched a new range of duplex test leads making it possible to give customers more flexibility. One buys one set of tester end leads and attaches any of a selection of probes and clips to the tough duplex connector, one of which can house an LED indicator. Used with the DLRO10 series, the indicator will warn of connection to hazardous live voltages, indicate continuity, the completion of the test and passing or failing pre-set test limit.