EmcTest Technologies SrlsVia Marecchiese, 273 47922 – RIMINI (RN)P.IVA: IT-04392270403Tel.+39 0541 728562 Fax.+39 0541 1792293E.mail: info@emctest.itHomepage: www.emctest.it

w w w . e m c t e s t . i t

Tested and edited by

Eng. Gian Marco De Lucia – Test Technician

Verified and approved by

Eng. Gian Marco De Lucia - Head of Laboratory

This test report and the information contained herein represent the results of testing articles/products identified and selected by the client. The tests wereperformed to specifications and/or procedures approved by the customer. EMC Test Technologies makes no representations expressed or implied that suchtesting fully demonstrates efficiency, performance, reliability or any other characteristic of the articles being tested, or similar products. This report shouldnot be relied upon as an endorsement or certification by EMC Test Technologies of the equipment tested, nor does it represent any statement whatsoeveras to its merchantability or fitness of the test article or similar products for a particular purpose. This document shall not be reproduced except in full with-out written approval from EMC Test Technologies.

Test Report N°:200011-TR01R

Place and date of issue Rimini, 10/02/2020

Customer Würth France SA

ZI Ouest – Rue Georges Besse - BP40013

67158 Erstein Cedex

Order number and date 200011 issued 31/01/2020

Sample receipt date 18/05/2016

Sample identification code 0078

Date of testing 16/06/2016

Place of testing EMC TEST Technologies Laboratory - Rimini

Purpose of testing Electric strength test according to CEI EN 60243-1 standard

Page

n. 1 of 10This report consists of n. 10 pages.

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Table of Contents

1 - Introduction .............................................................................................................................................. 3

1.1 - Scope ................................................................................................................................................. 3

1.2 – Terms and definitions ........................................................................................................................ 3

2 – EUT specifications*................................................................................................................................... 4

3 - Normative references................................................................................................................................ 4

4 – Test Equipment......................................................................................................................................... 5

5 - Environmental conditions recorded during the tests.................................................................................. 6

6 – Test mode................................................................................................................................................. 6

6.1 - Sample conditioning........................................................................................................................... 6

6.2 – Electrodes system and proof container .............................................................................................. 6

6.3 – Test generator ................................................................................................................................... 7

6.4 - Test procedure ................................................................................................................................... 7

6.5 - Disruptive discharge determination.................................................................................................... 9

7 – Test results ............................................................................................................................................... 9

8 - Conclusions ............................................................................................................................................. 10

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1 - Introduction

1.1 - Scope

The test scope is the determination of the electric strength of solid insulating materials at power frequency

voltages under the prescribed test conditions. The electric strength is calculated by the determination of

breakdown voltage through the thickness of the material under test.

1.2 – Terms and definitions

– Electric breakdown voltage or breakdown voltage: electric potential difference at which a breakdown

of the dielectric between two electrodes occurs.

– Dielectric breakdown: Event evidenced by increase in the conductance of the tested dielectric, which

limits the insulation of the electric field across the material thickness.

– Dielectric strength: voltage gradient at which the dielectric breakdown occurs under the prescribed

test conditions.

– Discharge: electrical disruptive discharge on the electrical insulation surface or in the surrounding en-

vironment that could cause permanent damages to the insulation.

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2 – EUT specifications*

Trademark

Manufacturer Würth France SAZI Ouest – Rue Georges Besse - BP4001367158 Erstein Cedex

Model/Reference Art.N°0975 450 910– Gel isolant électrique 280 ml

s/n -

Description The sample under test consists of 800 gr of product in a plastic jarready to use.

3 - Normative references

CEI EN 60243-1:2014 - Electric strength of insulating materials - Test methods. Part 1: Tests at power fre-quencies.

Changes in comparison to the applied standard

The test was carried out on an insulating gel with high viscosity rather than on a solid insulating material.

(*) according to Customer declarations.

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4 – Test Equipment

The following equipment was used to perform the test.

Manufacturer Model Description

AME ELE 108 Single-phase elevator transformer

Agilent/HP 6842A Programmable AC generator

Angelantoni UY 1200 Climatic chamber

Black Box IC404A USB Converter – Optical fiber

EmcTest EMC-DWT-EL02 Pair of semi-spherical electrodes with a diameter of (15.7 ±1)mm

EmcTest EMC-DWT-FIX Fixture in PTFE with bowl for electrodes EMC-DWT-EL02

Fluke 87 Digital multimeter

Fluke 80K-40 High voltage probe

Hanna Instruments HI8564 Thermo-hygrometer

EMCTEST EMC-SCAM-USB-FB Self powered shielded camera with optical fiber output

Powerfix Z22855 Digital Calliper

Sony Nex 5 Digital camera

Toshiba Tecra Laptop

- - Electrical cables for high voltage (up to 50 kW insulation)

- - Flexible meter

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5 - Environmental conditions recorded during the tests

Atmospheric Pressure [mbar] 1009.3

Temperature [° C] 21

Relative Humidity [%] 52

6 – Test mode

6.1 - Sample conditioning

Before testing, the specimens were conditioned for 24h at temperature (23 ± 2) °C and relative humidity

(50± 5) %.

6.2 – Electrodes system and proof container

The electrodes system used is composed by two semi-spherical brass electrodes having a diameter of 15.7

± 0.1mm.

The electrodes were placed on both side of a special fixture entirely made of Teflon and the distance be-

tween them was 1.24 ± 0.01mm. The fixture is equipped with a reservoir where the sample to be tested

was poured and it has slowly filled every interstice and in particular the volume between the electrodes.

Furthermore, the necessary time was taken in order to let any air bubble leave the material.

Details of the electrodes system and the reservoir filled with the sample

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6.3 – Test generator

The electrodes are powered by the elevator transformer, capable of generating a sinusoidal voltage vari-

able between 0 V and 50 kV at 50 Hz with a current of 20 mA. The primary circuit of the transformer is

power supplied by an AC stabilized programmable logic voltage generator capable of recording any dis-

charge between the electrodes by means of an overcurrent alarm.

6.4 - Test procedure

The test is performed by applying a sinusoidal voltage (50 Hz) to the two electrodes whose magnitude is

gradually increased, according to the standard prescription (Method C, Slow rate of rise test, see next im-

age), until a disruptive discharge that perforates of the insulator (dielectric breakdown) occurs.

The voltage between the two electrodes is monitored and recorded during the test using a high voltage

probe.

“Slow rate of rise test” profile

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Test setup pictures

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6.5 - Disruptive discharge determination

A discharge takes place when the thickness of the material cannot contain the electric field generated by

the voltage which is present between the electrodes. This causes a visible and audible arc, which perfo-

rates the material and causes an instant current increase between the two electrodes.

The required voltage value was calculated by averaging the values obtained in two consecutive measure-

ments.

7 – Test results

The following table describes the results obtained for the tested sample.

Measure Electrodes distance Measured breakdownvoltage

Electric strength

[n.] [mm] [kV] [kV/mm]

1 1.24 12.16 9.81

2 1.24 11.68 9.42

Average 9.61

Disruptive discharge through the material

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8 - Conclusions

The dielectric strength obtained for the tested sample is:

9.61 kV/mm