VLF Sine 45 kV

Compact VLF sine wave test system

Portable 45 kV VLF sine wave, DC and sheath test system for MV cables with optional tan delta diagnostics.

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Test, diagnose and sheath‑test with one rugged system

One unit for VLF, DC, sheath testing and (with ESG NT2) sheath fault pinpointing—ideal for field work and cable test vans.

Optional TanDelta with automatic IEEE 400.2 evaluation

Run TanDelta step tests on-board, then get consistent pass/warn/fail style interpretation to IEEE 400.2—or apply your own limits across a fleet.

Handles higher capacitance loads with automatic frequency control

Automatic 0.01–0.1 Hz frequency adjustment helps you test longer cables efficiently while maintaining stable test voltage quality.

Safety features that protect people and assets

Breakdown detection, earth‑loop monitoring and automatic discharge reduce risk, and help limit stress on fault‑free insulation.

Reporting that’s ready for audit trails

Store 1000+ tests internally, review results on screen, and export datasets via USB into MeggerBook Lite for clear, repeatable reporting.

Full Product Details

About the product

High‑performance testing and diagnostics for medium‑voltage cables

The VLF Sine 45 is a compact, robust test and diagnostic system designed for commissioning, maintenance and condition assessment of MV cables. It delivers a true 0.1 Hz sinusoidal test voltage up to 45 kVpeak (32 kVrms), plus DC and VLF rectangular voltage, so you can run the right test voltage shape for the asset and the standard you’re working to.

All‑rounder for field testing and deeper diagnostics

VLF withstand testing for new installations and in‑service cables
Optional internal TanDelta (dielectric loss factor) step testing, with automatic evaluation to IEEE 400.2 or your own threshold levels
Sheath testing and sheath fault pinpointing to IEC 60229 (with the optional ESG NT2 step voltage probe)
Monitored withstand testing with TanDelta or partial discharge measurement for deeper diagnostic insight

Designed to handle long cables without compromising test quality

The system automatically adapts test frequency (0.01–0.1 Hz) to cable length/capacitance, helping you test higher‑capacitance loads efficiently. With a maximum test capacity of up to 10 μF (at reduced voltages/frequencies), it’s well suited to a wide range of MV networks. For extended capabilities, it can be paired with the optional VLF CR‑40‑TB booster to increase test performance up to 5 μF at 0.1 Hz and 40 kVrms.

Built‑in safety and faster reporting

Integrated breakdown detection, earth-loop monitoring and automatic discharge help protect both the operator and the test object. A 7" colour touchscreen, intuitive on-board software, and a rotary control that can be used while wearing gloves make the system easier to operate in real working conditions. Internal memory stores at least 1000 measurements, supporting efficient reporting and record keeping. Results can be reviewed on the unit and exported via USB for reporting in MeggerBook Lite (included), or for more advanced reporting and archiving in the full version of MeggerBook. The system is also prepared for wireless data transfer.

Expandable to partial discharge testing

As a power source for the optional PDS 62‑SIN PD attachment, the VLF Sine 45 kV can be expanded into a universal system for withstand testing, TanDelta diagnostics and PD measurements.

FAQ / Frequently Asked Questions

Do I need a laptop to run TanDelta tests?

No. TanDelta step tests and evaluation can be performed directly on the instrument (option required), with results exportable for reporting.

How does it cope with long cable lengths?

The system automatically adapts test frequency (0.01–0.1 Hz) based on cable capacitance, helping you test higher‑capacitance loads more efficiently.

Can it help with sheath fault pinpointing?

Yes. In combination with the optional ESG NT2 step voltage probe, the system supports sheath fault pinpointing to IEC 60229.

How do I create reports?

Export measurement datasets via USB and import them into MeggerBook Lite (included) or the full MeggerBook software to generate reports and archive results.

What tests can the VLF Sine 45 perform?

VLF sine withstand testing, VLF rectangular testing, DC testing up to ±45 kV, and sheath testing up to −20 kV DC. With options, it supports TanDelta diagnostics and partial discharge testing.

Troubleshooting

HV will not switch on / HV switches off automatically

Check the safety circuit messages on screen and address the cause:

F‑Ohm: Earth resistance too high. Confirm the earth cable and HV cable shield are connected correctly and have clean metallic contact.
EMERGENCY OFF switch: Emergency stop has been pressed. Remove the cause, then manually release the emergency stop on the front panel / external safety unit.
Key switch locked: Unlock the safety key switch to allow HV operation.
Overtemperature: Allow the unit to cool, then restart.
HV cable not correctly connected: Ensure the HV connection cable is properly locked into the HV output.
Boost module not ready: Check the booster connection and status, then power-cycle if required.

If the issue persists

Export the system log (in the extended settings menu) to a USB flash drive and share it with Megger service for faster diagnosis.

Interpreting test results

Withstand testing

A test is typically considered passed when the defined test time completes without a breakdown and the system shuts down normally.
If a breakdown is detected, the system automatically aborts the test, switches off the HV generator and discharges the test object. The shutdown screen shows the cause and the breakdown voltage. The cable should then be treated as faulty and moved to fault location, since further voltage-based diagnostic tests can no longer be carried out.

TanDelta diagnostics (option)

TanDelta step tests provide a measure of insulation ageing (dielectric losses). The instrument can evaluate results automatically using built‑in standards based on IEEE 400.2, or using your in‑house limit sets.
For consistent fleet‑wide decisions, you can create and distribute your own evaluation standards via MeggerBook (export/import *.tds files).

Reporting and audit trail

Review results on the instrument, then export datasets to a USB flash drive and import them into MeggerBook Lite / MeggerBook to create reports and archive measurements.
Tip: Set the correct time zone on the instrument before testing so the report timestamps match your records.

Software and firmware updates

MeggerBook software

latest version

MeggerBook & MeggerBook Lite Software

latest version

4.4.0

What’s new in version 4.4.0

Updates

Incorrect reset of the propagation speed v/2 on the Settings page
Incorrect behavior of the Settings page when the virtual keyboard is absent
Crash when editing report templates
Preview pages are displayed in letter format
During an active search, entries that are not visible can be selected
The cable description in the report does not display any special characters (including ü¼ö¶ä¤)
In TDR analyses, the velocity is always given in v/2

Improvements

Database version check
Refresh on cable changes
Phase-resolved tanDelta trend data in BA TanDelta MWT
Improve handling of Winkis data (Sqlite2)
Save import/export folder path in MeggerBook
Update TanDelta standards
Display GPS status on map
Display the sleeve or cable type when hovering over the cable run

New Features

Display TE measurements properly in the activity view in MeggerBook
The radio options on the "Language settings" page are not working well
Extremely large Megger-mcb files due to PDF reports made manageable

The setup file below is suitable for the installation of both MeggerBook (full version) and MeggerBook Lite (free limited version).

When started with after adding the electronic license key into the installed software, the software starts as MeggerBook full version which allows for easy and comprehensive data evaluation, data archiving, cable management and report creation. A personal quotation for a certain number of licenses can be requested here . The new electronic license key allows for 3 devices to have MeggerBook full version installed on them.

The dongle key licenses from older versions of MeggerBook are not supported with this newer version. Updated electronic license keys can be requested here for previous customers.

Without the required software license key the software starts as MeggerBook Lite which allows for seamless report creation and offers some of the features as the full version while limiting the data storage options as follows:

• Measurements, analyses and reports are not permanently stored in the database

• While cable import and storage are not limited, a maximum of 5 cables can be created using the cable editor of the Lite Edition

At this time, the software can handle the measurement and test data of the following Megger devices:

Test vans: Centrix 2.0, Primeon Centrix City, Compact City, R30 2.0, Variant

Test systems: VLF Sine 34 / 37 / 45 / 62, VLF CR 40/60, TDS 40/60, Easytest 20, MFM 10

TDRs: Teleflex VX(-P), Teleflex SX-1

Note for test systems VLF Sine Wave 45 and VLF Sine Wave 62:

Data of these test systems can only be imported into the software, if the test systems is equipped with firmware version 3.14 or higher. The latest firmware can be found here (VLF Sine Wave 45) and here (VLF Sine Wave 62).

x-msdos-program 111.56 MB

VLF Sine Wave 45 Firmware

latest version

VLF Sine Wave 45 Firmware

latest version

4.2

Bug fixes:

Display of correct testing time
Update of Tan Delta step test values
Display of missing messages of the testing results (especially for short circuit and stopped measurement due to low load during PD)

zip 2.39 MB

FAQ / Frequently Asked Questions

What USB drive format is supported?

Use a USB flash drive formatted with a FAT32 file system.

How do I export test data?

Select the required measurement records on the instrument and export them to an inserted USB flash drive. You can then import the data into MeggerBook Lite / MeggerBook on a Windows PC.

Can I activate the TanDelta option later?

Yes. Purchase the licence, then enter the licence key on the instrument or import the provided key file from USB.

How do I update firmware or add menu languages?

Copy the provided firmware files to a USB flash drive, then use the File Explorer in the service/extended settings menu to run the update. Do not power off during the update; the unit will restart automatically.