Review of Recent Changes to Arrester Standard IEC 60099-4

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Surge arrester standards must evolve continually in order to better reflect changes in the stresses and duty expected during service as well as in the current technology. Recently, an updated version of IEC 60099-4 was published with Rev 3.0 replacing Rev 2.2. Some of the changes made to type tests are relatively minor but others are substantive. This article from 2015, based on a contribution by Steve Brewer of Hubbell Power Systems at the 2015 INMR WORLD CONGRESS, explained the significant changes in the updated standard with the goal of promoting it rapid adoption by the power industry worldwide.


Table 1 compares the various type tests that used to be required as part of the prior version of the standard with those included in the new version.

Comparison of Arrester Type Tests in IEC 60099-4: Edition 2.2 vs. Edition 3.0 iec 60099-4 Review of Recent Changes to Arrester Standard IEC 60099-4 Screen Shot 2016 01 04 at 10
Table 1: Comparison of Arrester Type Tests in IEC 60099-4: Edition 2.2 vs. Edition 3.0
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Changes to Classification of Arresters

New edition of arrester standard places greater attention to diversity of applications where an arrester is applied. iec 60099-4 Review of Recent Changes to Arrester Standard IEC 60099-4 Screen Shot 2016 07 22 at 14
New edition of arrester standard places greater attention to diversity of applications where an arrester is applied.
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The first major change to the standard has involved replacing the four standard nominal discharge current ratings with six new classifications. These changed classifications, intended to more aptly reflect the diverse applications where an arrester is being used, are: Station High, Station Medium, Station Low, Distribution High, Distribution Medium and Distribution Low (see Table 2).

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In the past, arresters were further classified by a long duration test, which required only 3 samples and was applicable irrespective of whether they were for use at a substation or were Class 1, as commonly used on distribution systems (see Fig. 1).

Classification of Arresters: Previous & Updated Standard iec 60099-4 Review of Recent Changes to Arrester Standard IEC 60099-4 Screen Shot 2016 01 04 at 10
Table 2: IEC Classification of Arresters: Previous & Updated Standard.
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Long-duration current impulse withstand test (Edition 2.2 – (8.4). iec 60099-4 Review of Recent Changes to Arrester Standard IEC 60099-4 Screen Shot 2016 01 04 at 10
Fig. 1: Long-duration current impulse withstand test (Edition 2.2 – (8.4).
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This has been replaced in the updated Standard by a Repetitive Charge Transfer Test – Qrs (see Fig. 2). This test requires 10 samples and has different energy input wave shape depending on the arrester’s intended application. Moreover, the long duration classifications are no longer used and thermal recovery is not a criteria for Qrs rating.

Repetitive Charge Transfer Rating Test (Edition 3.0 - 8.5). iec 60099-4 Review of Recent Changes to Arrester Standard IEC 60099-4 Screen Shot 2016 01 04 at 11
Fig. 2: Repetitive Charge Transfer Rating Test (Edition 3.0 – 8.5).
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After establishing the arrester’s Qrs rating, the standards next require completing the appropriate operating duty test. Since most readers are already familiar with the requirements of the 2.2 Revision of IEC 60099-4, only the new requirements for Revision 3.0 are presented: The arrester sample is subjected first to a series of pre-conditioning discharges. Then, distribution arresters are subjected to two 8/20 current discharges of the appropriate energy, depending on class. After the energy injection, the arrester is energized at Ur for 10 seconds followed by a 30 minute recovery at Uc .

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Operating duty tests – MOV pre-conditioning (Edition 3.0 - 8.7). iec 60099-4 Review of Recent Changes to Arrester Standard IEC 60099-4 Screen Shot 2016 01 04 at 11
Fig. 3: Operating duty tests – MOV pre-conditioning (Edition 3.0 – 8.7).
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The test sequence is similar for station arresters except for the fact that the energy is input as a square wave simulating a switching event on a transmission line.

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duty tests – Qth injection - Distribution (Edition 3.0 - 8.7). iec 60099-4 Review of Recent Changes to Arrester Standard IEC 60099-4 Screen Shot 2016 01 04 at 11
Fig. 4: Operating duty tests – Qth injection – Distribution (Edition 3.0 – 8.7).
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Operating duty tests – Wth injection - Station (Edition 3.0 - 8.7). iec 60099-4 Review of Recent Changes to Arrester Standard IEC 60099-4 Screen Shot 2016 01 04 at 11
Fig. 5: Operating duty tests – Wth injection – Station (Edition 3.0 – 8.7).
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Power Frequency Voltage versus Time

The primary change to this section is that both ‘no prior duty’ and ‘with prior duty’ tests are now required. The prior duty energy injection wave shape is lightning in the case of distribution arresters and switching in the case of substation arresters (see Fig. 6).

TOV voltage versus time test (Edition 3.0 - 8.8). iec 60099-4 Review of Recent Changes to Arrester Standard IEC 60099-4 Screen Shot 2016 01 04 at 11
Fig. 6: Power-frequency (TOV) voltage versus time test (Edition 3.0 – 8.8).
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Arrester Disconnector Tests 

This new version of IEC 60099-4 recognizes that for some arrester designs the disconnector is a part of the sealing system. Testing of the disconnector is therefore performed to verify that Qrs and Wth or Qth duty do not cause the disconnector to operate. Additionally, the arrester with disconnector must demonstrate mechanical withstand and seal pumping capabilities to verify that the disconnector is not the weak link in the overall design.

Summary of Benefits from Recent Changes

The latest revision of IEC 60099-4 is seen as providing the following benefits to users:

1. Better aligning tests to classify the type of arrester more closely with its actual application. Line discharge classes have also been eliminated.

2. Providing a common basis for manufacturer test methods when it comes to publishing energy claims. This applies for both MOV durability and thermal recovery.

3. Modifying TOV tests to require ‘no-prior duty’ as well as ‘prior duty’ testing.

4. Requiring both mechanical and seal testing for disconnectors.

 

One thought on “Review of Recent Changes to Arrester Standard IEC 60099-4

  • February 8, 2017 at 3:04 am
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    Could you inform some different type test betwen to version of IEC 60099-4?

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