(version 10.2014)
C2/113-3 - Technical file for classification and homologation - p 1 / 18

Table of contents
1 Instructions for composition of the technical file ................................................................................ 3
1.1
General information ........................................................................................................................... 3
1.2
Label .................................................................................................................................................. 3
1.3
File structure (folders and subfolders) and file names ...................................................................... 3
1.4
Introduction of addenda ..................................................................................................................... 3
2 Instructions to complete the conformity assessment guide .............................................................. 4
3 Specific test specifications..................................................................................................................... 6
3.1
Folder C – EN 62271-200 §6.5 – Temperature rise tests specifications ........................................... 6
3.1.1
Requirements for test setup .......................................................................................................................... 6
3.1.2
Continuous reference current (Iref) ............................................................................................................... 6
3.1.3
Testing methods for 2K + T combination ....................................................................................................... 6
3.1.4
Criteria: .......................................................................................................................................................... 8
3.1.5
Test method for circuit breaker functional unit ............................................................................................... 8
3.2
Folder D - EN 62271-200 § 6.6 - Short-time withstand current and peak withstand current tests .... 8
3.3
Folder E - EN 62271-200 § 6.7. - Verification of the degree of protection IP .................................... 8
3.4
Folder F - EN 62271-200 §6.8 - Tightness test ................................................................................. 9
3.4.1
Tightness test after mechanical endurance test ............................................................................................ 9
3.4.2
Oven tightness test, at extreme temperatures of 40°C and 80°C .................................................................. 9
3.5
Folder I - EN 62271-200 § 6.10 - Ageing test for compliancy to Design Class 2 (EN/TS 62271-304)
9
3.5.1
Application ..................................................................................................................................................... 9
3.5.2
Criterion ......................................................................................................................................................... 9
3.5.3
Exemption and assimilation ......................................................................................................................... 10
3.6
Folder I - EN 62271-200 § 6.10 - Salt mist test (EN 60068-2-11) ................................................... 10
3.7
Folder K – EN 62271-200 §6.101 Switch-fuse combination – transfer and take over currents (EN
62271-105) ................................................................................................................................................... 11
3.7.1
Take over current ........................................................................................................................................ 11
3.7.2
Transfer current ........................................................................................................................................... 11
3.8
Folder Q - EN 62271-200 § 6.106 - Internal arc test - Test criteria by category and IAC class ...... 11
3.8.1
AA10 category: ............................................................................................................................................ 11
3.8.2
Category AA15 ............................................................................................................................................ 12
3.8.3
Category AA20 ............................................................................................................................................ 12
3.8.4
Categories AA3x ......................................................................................................................................... 12
3.8.5
Categories AA3x: special criteria ................................................................................................................. 12
3.8.6
Category AA35: ........................................................................................................................................... 13
3.8.7
Category AA40 ............................................................................................................................................ 13
3.9
Folder W – Testing of a complete protection chain for MV circuit breakers equipped with a protection relay without auxiliary supply or dual power supply .................................................................... 13
3.9.1
Introduction .................................................................................................................................................. 13
3.9.2
Protection chain comprising a protection relay without auxiliary supply ...................................................... 13
3.9.3
Protection chain comprising a protection relay with dual power supply ....................................................... 14
3.9.4
Test report ................................................................................................................................................... 14
4 Specific test specifications for Metering panel .................................................................................. 15
4.1
General ............................................................................................................................................ 15
4.2
Current transformer (CT) ................................................................................................................. 16
4.3
Voltage transformer (VT) ................................................................................................................ 16
5 Clarification of specific codes F & H for Circuit breaker performance ............................................ 17
5.1
Maximum duration of instantaneous breaking ................................................................................. 17
5.2
Circuit breaker maintenance class H ............................................................................................... 18
C2/113-3 - Technical file for classification and homologation - p 2 / 18

The homologation file shall be submitted in electronic form on CD-ROM or DVD format, in two copies.
USB keys or File transfer will not be accepted.
The case file needs to be certified (complete name, signature, company stamp) by a representative of the applicant, who can legally bind the applicant.
The label of the CD-ROM / DVD and its box shall mention at least the following information:
 the title and the version (revision number + revision date) of the file
 the date of the cover letter
The composition of the technical file is based on the exact structure and contents of the conformity assessment guide (see §2).
The root file shall at least contain the following information:
Manufacturer- Switchgear family - AA category – Version (date)
The picture below gives an example of how to build the mandatory structure of folders and subfolders when composing the technical file:
…..
Technical files with a deviating or incomplete structure will not be accepted.
If an addendum to the original technical file is introduced afterwards, a new CD-ROM or DVD shall be provided, in two copy's.
The CD-ROM / DVD shall contain the following folders:
 The original technical file, exactly as introduced earlier
 The addendum as a separate folder, following the instructions above but containing only the new or updated files: o the structure of folders and subfolders must be exactly the same as the original technical file o updated or new files will be marked with the date "yyyymmdd" of update o updated cells in the new conformity assessment guide will also be completed with the date
"yyyymmdd" of update, and this cells will be marked in yellow
C2/113-3 - Technical file for classification and homologation - p 3 / 18

The conformity assessment guide can be downloaded on the website of Synergrid together with the current document, or through the link below:
C2-113-3_E_assess ment_guide_2014102
The file must be filled in as explained and illustrated on the picture on the next page.
All cases of concern with regard to the proposed FU are marked in pink background colour, and must be filled in.
The specific test specifications that are not described in the conformity assessment guide, are available in chapter 3 (functions K, T, D, M, P and RB) and chapter 4 (metering panels) of this document.
The conformity assessment is based on the rating confirmed in the shortlist (C2-113-2). Only the functional units introduced in the summary of the shortlist will be taken into account.
C2/113-3 - Technical file for classification and homologation - p 4 / 18

Switchgear family :
AAxx category : manufacturer designation of the switchgear (Belgian version) in accordance with the technical prescription Synergrid C2/112.
Synergrid scheme FU : In accordance with the technical file Synergrid C2/119
(Schemes for functional unit )
Manufacturer designation : Unambiguous commercial designation of the FU.
Rated current Ir or Ir bb
: Rated current Ir of the FU or rated busbar current Irbb for the
Assembly & Busbar"
If more than one alternative is proposed for one function (for example various Ir or various connection types), a column must be added to have one column per alternative.
In this case, if no dedicated report or document is of concern, the field of the added column has to be filled in with "see FU xxx"
The specific requirements or ratings which are not fully described in the NBN EN standards are listed in this column.
In case the full requirement is not stated into the column “specific requirements” but is indicated in the chapters 3 and 4 of this file, the letter
“ Y" is mentioned in this column.
The FU for which these lines (4 to 8) are not filled in, will not be considered as proposed. the applicant shall state the correct answer.
The references of the applying test reports provided in the corresponding folders B to W shall be filled in:
 REPxxx: The report reference has to be preceded by the prefix "REP".

DECLxxx: If a Clarification (i.e.: need of a compilation of several reports) or a Declaration of conformity is submitted, the reference of this document has to be preceded by the prefix
"DECL". If the test object is not in accordance with the proposed FU or Switchgear family, it is mandatory to join a "DECL" document.
C2/113-3 - Technical file for classification and homologation - p 5 / 18

This chapter is applicable for the items marked with a “Y” in the column “Requirements according C2/113-3 chapter 3 & 4” of the conformity assessment guide.
The applied folder codes (C, D, E, …) are in accordance with the codes used in this conformity assessment guide, and the model zip file.
For metering panels, derogating and/or simplified requirements may be applicable: see chapter 4.
3.1.1 Requirements for test setup
For metal- or insulation-enclosed switchgear temperature rise tests, the following arrangements must be made:
 The functional units are mounted as in normal use, including the cell bottom plates, the ventilation openings, and the presence of a gas exhaust channel for the AA33 version.
 There must be no cooling effect caused by an adjacent cell not subject to the test. For modular type cells, the external side faces of the functional units under test must be thermally isolated.
 The partition simulating the rear wall behind the functional unit shall have a maximum heat transmission coefficient of 3.8 W / (m²K) (value for a 20 mm wooden board). The distance between the functional unit and the wall shall comply with the manufacturer's instructions.
 The sections of cables or bars used for the connection shall be: o < 50 mm² Cu for xxT and Txx type cell (designation: see Appendix D) o 400 Cu mm² for I r
= 630 A or 800 A o For I r
> 800 A: to be agreed with Synergrid commission CE2.
 The test has to be performed simultaneously on the switch-disconnector function and on an adjacent switch-fuse combination function or a circuit breaker (see method A above). Failing this method B as described shall apply.
 Determination of the temperature rise class for the switch-fuse combination unit, and consequently of the values used for the test must be related to its continuous reference current, i.e.: o Section of the cables or single core insulated wires: 25 mm² Cu o Dimensions of the fuses used for the test: type I fuses, dimension D = 292 mm according to
NBN EN 60282-1
3.1.2 Continuous reference current (Iref)
According to the continuous reference current (I ref
) and maximum power dissipation per fuse (P ref
), announced by the manufacturer:
 For I ref
 For I ref
= 40 A : test current ≥ 40 A with power dissipation ≥ P ref
= 40 W per fuse
= 50 A : test current ≥ 50 A with power dissipation ≥ P ref
= 50 W per fuse
 For I ref
= 63 A : test current ≥ 63 A with power dissipation ≥ P ref
= 63 W per fuse
 For I ref
= 80 A : test current ≥ 80 A with power dissipation (P ref
) 80 W or 100 W per fuse if the
 manufacturer announces a power dissipation of 100 W per fuse.
For I ref
= 100 A : test current ≥ 100 A with power dissipation ≥ P ref
= 100 W per fuse
3.1.3 Testing methods for 2K + T combination
The tested combination will be composed of 2 ‘cable’ functional units each equipped with a load-break switch and a ‘transformer’ functional unit equipped with a fuse-switch combination (the fuse links will be of the DIN
10 type).
Loading: The test may be run according to two methods for the application of the test current.
C2/113-3 - Technical file for classification and homologation - p 6 / 18

Method A : Complete test in one step (preferred method)
I
2
= rated current (f.i. 630 A)
Let I r3
be the rated current to be demonstrated for the fuse switch combination (preferential values are 40, 50, 63, 80 A).
Let P be the power dissipation capability per fuse (preferential values are 40, 50, 63, 80, 100 W).
The fuses and the current in the fuse will be such that :
 I3
≥
Ir3
 actual power loss in each fuse during the test
≥
P
Then, of course I
1
= I
2
- I
3
.
I
1
I
2
I
3
The power losses in the fuses are indirectly measured by a voltage drop measurement and recorded in the test report.
Disposition of the equipment and connections: see § above.
Test criteria: refer to NBN EN 62271-1.
Method B: Test in two steps
Measuring points: For the two steps, the measuring points have to be placed at the same position as for a complete test according to method A. All temperature rises are recorded during the two steps.
First step: test of the ‘cable units’
A first test is conducted by loading of the ‘cable’ functional units at rated current.
The Fuse switch combination is not loaded but is equipped with fuse links. The temperature rise of the fuse contacts are recorded and mentioned in the test report.
Disposition of the equipment and connections: See § above
I
1
= I
2
I
2
I
3
= 0
Second step: test of the fuse switch combination
Let I r3
be the rated current to be demonstrated for the fuse switch combination (preferential values are 40, 50, 63, 80 A).
Let P be the power dissipation capability per fuse
(preferential values are 40, 50, 63, 80, 100 W).
The fuses and the current in the fuse will be such that:
 I
3
≥
I r3
 actual power loss in each fuse during the test
≥
P
I
1
= I
3
I
2
= 0 I
3
The temperature rise in functional units 2 and 3 are both measured. The power losses in the fuses are indirectly measured by a voltage drop measurement.
Disposition of the equipment and connections: see § above.
C2/113-3 - Technical file for classification and homologation - p 7 / 18

3.1.4 Criteria:
The temperature rises recorded in both steps will be within the limits fixed by the standards NBN EN 62271-1
The combination (addition) of the temperature rises of both steps will also be evaluated. It should also be within the limits fixed by the standards but a correction (correction factor < 1) will be allowed to compensate for the increased severity with respect to method A.
Note: For fuse switch combinations with a rated power dissipation capacity of 40 W, it is accepted that the combined temperature rises exceeds the limits.
3.1.5 Test method for circuit breaker functional unit
Reference case
A temperature rise test will be made with the circuit breaker installed in an individual cell at rated current.
The power losses in the circuit breaker will be recorded by measuring the voltage drop across terminals.
Other measurements and criteria: according to NBN EN 62271-1.
Disposition of the equipment and connections: see § above
Extension to another circuit breaker model.
Once a the temperature rise test has been made for one specific circuit breaker, the results can be extrapolated to other models by combining:
−
The temperature rises of the ambient air in the enclosure
−
The temperature rises of the other circuit breaker tested in independently in free air
−
A correction based on the power losses of both the reference circuit breaker and the other one
NB: this is only possible if the power losses have been recorded in both cases.
The extendable RMU versions, with extension fitted, must also be subjected to the tests.
For equipment equipped with an arc mitigation effect active device (for which detection is based on a mechanical principle), all the short duration current tests provided for by NBN EN 62271-1 shall be performed with this active device operational. In addition to the criterion provided by the standard, this must not be triggered.
The test can be omitted:
•
For any metering (M) or voltage (P) FU downstream of protection by a switch-fuse combination, on production of proof of the required behaviour.
•
For any metering (M) or voltage (P) FU not including bars whose length, geometry and fixing methods are such that they could present a risk of movement during passage of a short-circuit current.
•
For any bar mounted (RB) FU on production of proof of the required behaviour.
The protection ratings are as follows:
External encloser:
Accessible faces except the upper face:
Upper faces:
Characteristics of the exhaust channel opening to the outside for AA33 category equipment
Inner partitioning
Separation partition between LV and MV compartments
Separation partitions between two main circuit compartments
Discontinuities between partitions and shutters
Separation partitions between two LV and LV compartments
Compartments or volumes communicating with the route for exhaust path of gases caused by an internal arc in any compartment
Shutters or other devices preventing access to the operating interface
IP2X-D
IP31 or IP2X-D
IP23-D
IP3X
IP2X
IP2X
IP1X
IP3X with full walls or
IP2X-D during the flow of gases from an internal arc
IK07
Gas discharge outlet to the expansion volume
Special case of the busbar extension systems for AA10, AA15 and AA20
Extension protection cover in standby
Connection in operation
IP0X
IP4X
IP3X-D
C2/113-3 - Technical file for classification and homologation - p 8 / 18

3.4.1 Tightness test after mechanical endurance test
Verification of the tightness of vessels containing SF6 including circuit breaker SF6 breaking chambers: the tightness test according to NBN EN 62271-1 § 6.8 "Tightness" and NBN EN 60068-2 -17, § 8 "Qm tracer gas test, general method by accumulation method is performed after the mechanical endurance tests". The tolerated leakage rate must guarantee a 30 year life cycle calculated on the basis of the formula of the appendix E of NBN EN 62271-1. The measurements are carried out with the help of an appropriate instrument with sufficient sensitivity, for example by mass spectrometer. Each measurement comprises 3 values recorded within a maximum time lapse of 3 minutes. The selected value is the mean of these recorded values. The first measurement is done as soon as possible after the test applying the constraint on the equipment. The maximum delay shall be 4 hours. A minimum of 3 cumulative measurement periods shall be considered. The second measurement shall be done after 24 hours and the third after 72 hours. The contents of the leakproof measurement enclosure shall not be renewed between measurements. The life time is calculated on the basis of the cumulative measurement after 24 hours. The other 2 measurements allow an assessment of whether the calculated value is plausible, in principle after stressing the leakage rate follows a decreasing curve.
3.4.2 Oven tightness test, at extreme temperatures of 40°C and 80°C
Verification of the tightness of vessels containing SF6 including circuit breaker SF6 breaking chambers: the tightness test (identical to that described above) is performed after a mechanical operation (C-O) within the 4 hours preceding placing in the oven, the device being equipped with its operating mechanism and auxiliary accessories, at the extreme temperatures of 40°C and 80°C life of respectively 40 years
2
and 12 months
3
1
The tolerated leakage rate must guarantee a
calculated on the basis of the formula of appendix E of NBN
EN 62271-1. The life is calculated on the basis of the cumulative measurement after a minimum of 24 hours.
The measurement is identical to that of`§3.4.1. The 24 hours are counted from stabilisation of the temperature at the test temperature. In the case where the test is performed in a rigid measurement volume, the pressure in this enclosure is returned to atmospheric pressure at the time of temperature stabilisation, before starting the chronometer.
The test is performed on 8 samples taken at random during manufacture. The leakage rate taken into account for life time calculation is the average of the values obtained plus twice the standard deviation
4
The test at 40°C is not required for the tanks fitted with a manometer (or equivalent) that show an equivalent life time greater than 40 years in the test at 80°C on a single tank.
3.5.1 Application
The test must be carried out according to level 2 (damp heat).
The equipment subjected to the tests must include all the functional units proposed, including the accessories that could be fitted to it (arc suppressor, measurement and protection transformers, VDS, trip coils, etc).
If the circuit breaker functional unit includes no insulating equipment other than those used in the switchdisconnector functional units, the test of the circuit breaker equipped with its current sensors and its trip coils can be done separately.
3.5.2 Criterion
The measurements and checks must be carried out before and after testing.
3.5.2.1 For protection devices and motor operated switching devices:
The condition check is done according to § 11.3 of EN/TS 62271-304, the increase in operation duration resulting from a trip by normal operation of the protection cannot exceed 20% of the total trip time for a switch-fuse combination and 20% of the total instantaneous trip time for a circuit breaker.
1
The temperature of 40°C corresponds to an ambient temperature of 30°C and SF6 enclosure temperature rise of 10 K due to ½ the nominal load, the 80°C temperature corresponds to an ambient temperature of
40°C and an SF6 enclosure gas temperature rise of 40 K due to the nominal load. The gas temperature rise at the nominal load can be replaced by the measured value from the type test, if this is available.
The high temperature (80°C) test is currently regarded as an investigation test. It must only be performed on a single example that obtained the worst result in the 40°C test.
2
3
Preferred value
4
Provisional value
This calculation allows a normal range with 95% confidence to be achieved.
C2/113-3 - Technical file for classification and homologation - p 9 / 18

This limit of 20% increase in the total operation time also applies for any other mechanism subjected to this test. For motorised equipment, the 20% operating current increase limit also applies.
In the case of a circuit breaker with integrated protection relay the 30 A zero-sequence test current is applied without any load current. The time must be measured for a circuit breaker equipped with a protection relay without external supply. This test also allows verification, in these conditions, that tripping by the low energy coil is still operational.
In the case of a circuit breaker equipped with protection relay with auxiliary supply the test control voltage is equal to 100% of the rated coil voltage.
The arc detection and suppression device must also be tested at the end of exposure.
3.5.2.2 For manual operated switching devices:
The operating torques at the minimum operating temperature must not exceed 10 daNm. In case of doubt concerning the correct operation of the switching device, an operation speed measurement and a making and breaking test will be performed.
3.5.2.3 Interlocks
Functional verification of all interlocks is also done.
3.5.2.4 Partial discharges
PD measurement by acoustic method (40 kHz) is to be done throughout the test duration. The sensor must be placed in the cable compartment of the switchgear. The maximum value for each cycle of 5 days and the maximum value during the electrical diagnosis must be stated in the test report.
3.5.3 Exemption and assimilation
These tests are not mandatory for switching devices with rated bus bar current I r
> 1250 A, exclusively when they are placed in heated rooms whose temperature is automatically regulated.
The same assimilation is granted to the active parts if one of the following condition is fulfilled :
• they are placed in a pressurised enclosure,
• each phase is under an earthed screen
• a combination of these two options.
Moving mechanical parts (including the trip coils) without synthetic material and not tested simultaneously with their functional units can be assimilated to pollution class 2 without this test being done. In this case a corrosion test of these mechanisms (§3.6) is required.
Metering FU:
Remark 1:
For an approval request for a metering cell that has already been tested to CEI/TS 62271-304 (ex-
CEI/TS 60932) and equipped with other instrument transformers, an exemption can be granted if these transformers have successfully passed the NBN EN 60587 test for the class 1A2.5, and if it is demonstrate that the cubicle arrangement and accessories do not introduce any additional degradation risk.
Remark 2:
For an approval request for a metering cell equipped with instrument transformers that have already been tested for class 2 in accordance with CEI/TS 62271-304 in another metering cell, an exemption can be granted if it is demonstrate that the modification of the geometry does not introduce an additional risk (reduction of insulation distances, IT and PT arrangements, local increase in electric field, condensation flow).
"Ka" corrosion tests to NBN EN 60068-2-11 : duration 168h
 Test conditions: the tests shall be performed on the complete operating mechanism (including any motorisation, its trip coil and the control electric circuits), either mounted as in normal service on the switching device if the test installation permits this, or fixed on a chassis in its normal operating position.
 Diagnosis: the operating mechanism shall be dried (air pulsed or not, maximum humidity of 45% and minimum temperature of 35°C), without preliminary washing. The the operating mechanism shall then be refitted to the switching device and placed under normal conditions for 2 hours.
 Evaluation criteria: the test criterion is identical to that of §.3.5.2 above. In addition the rust condition verification is done with colour photos. This shall not be greater than photo Ri1 of NBN EN ISO
4628/3.
C2/113-3 - Technical file for classification and homologation - p 10 / 18

3.7.1 Take over current
400, 500, 630, 800, 1000, 1250, 1600 A.
The minimum take over current relates to the temperature rise class and the maximum continuous reference current of the switch-fuse combination.
The following relation must be respected:
Maximum continuous reference current (according to temperature rise class)
40 A
50 A
63 A
80 A
100 A
3.7.2 Transfer current
Minimum take over current
350 A
450 A
600 A
800 A
1050 A
The transfer current is considered as equal to the take over current if this particular test has not been performed.
The minimum transfer current is related to the temperature rise class and the continuous maximum reference current and the opening time under the action of the apparatus striker.
The following relation must be respected:
Minimum transfer current for t < 55 ms
Minimum transfer current for t > 55 ms
Maximum continuous reference current (according to temperature rise class)
40 A
50 A
63 A
80 A
100 A
420 A
550 A
720 A
950 A
1250 A
400 A
500 A
670 A
900 A
1200 A
3.8.1 AA10 category:
An IAC class is not required. Nevertheless the pressure relief device(s) must be tested for each model of gas-filled compartment:
 either by a three-phase internal arc test in the gas-filled compartment for the level for which the equipment is presented according to the criteria for the IAC AFL class with a minimum of 14 kA-1s,
 or by the pressure test provided in § 6.103.1 of NBN EN 62271-200, during which pressure must be increased until opening of the device without exceeding the maximum value of 3 times the design pressure. The opening pressure must be noted in the type test report.
 either by a construction identical (without the cooler) to that of the version of the same device approved for category AA15.
On the other hand, for sealed pressure systems, the mechanical behaviour of the gas routing channels to the buffer volume, including all compartments in communication and any socle, shall be demonstrated:
 either by an internal arc test
1
or
2
in a configuration with a 0.5 m³ to 1 m³ buffer volume and output cross section from this volume less than 0.05 m², (including total cross section of leaks by interstices), or an internal arc test for which the overpressure achieved in the buffer volume is a minimum of 400 hPa.
 or by a test of behaviour at an equivalent static overpressure. This last test can be done with the help of any suitable system matched to the volume under test. The test is done with all the volumes in communication with the route for the gases that contribute to the buffer volume effect. The test criterion is demonstrated by the continuation of the IP3X degree to the outside of the specimen
1
The corresponding test can be that described in NBN EN 62271-202 in the pressurized enclosure, with the door of the prefabricated substation open. The test current is 14 kA-1s for installations intended to be supplied from a single cable (or on a circuit).
2
The corresponding test can be that described in NBN EN 62271-202 in the cable compartment, with the door of the prefabricated substation closed. The test current is 14 kA (x0.87) -1s for installations intended to be supplied from a single cable (or on a circuit).
C2/113-3 - Technical file for classification and homologation - p 11 / 18

under test as well as by the measurement and estimate of the interstices of leaks from the buffer volume, of which the total section must remain less than 0.01 m².
 or by finite element calculation for an equivalent load.
 either by a construction identical (without the cooler) to that of the version of the same switchgear approved for category AA15.
3.8.2 Category AA15 an IAC class is not required. Nevertheless an switchgear configuration fitted with its integrated cooler must be tested by a three phase internal arc test in the gas-filled compartment for the level for which the equipment is presented according to the IAC AFL
1
criteria.
The energy absorption performance at the equipment output is demonstrated by:
 either a ratio less than 60% for maximum mean overpressures reached during the internal arc test for each wall of the test room, with and without cooler, for the same test arrangement.2
 or by an internal arc simulation calculation with the same criterion as above
 or by minimum calculated energy absorption of 60% on evacuation of the gases from the equipment.
3.8.3 Category AA20
An IAC class is not required. The absence of external effect must be demonstrated on a switchgear configuration fitted with its arc suppression device. The internal arc test to the IAC AFL class criteria in the sealed pressure enclosure must be done for two test currents with one less than 30% and the other equal to
100% of the rated internal arc withstand current. These tests must be done under the conditions defined in
NBN EN 62271-200 or NBN EN 62271-202
1
with the criteria of this standard and tank recorded as hermetic after the tests.
3.8.4 Categories AA3x
General criteria: class IAC AFL 14 kA -1s for installations intended to be supplied by a single cable (or on a distribution network ring) and 16 kA -1s for installations intended to be supplied by several parallel links or by a link with electrical cross section greater than 400 mm² Al, 20 kA-1s for installations placed in a decentralised production unit cabin directly connected to a primary substation.
The internal arc behaviour test conditions provided by NBN EN 62271-200 are completed by the following provisions:
 the tests performed on 2 functional units according to the standard can be performed on a set of 3 functional units, the arc being initiated in the end cell, adjacent to the side indicators, in order to take a realistic back clearance volume into account.
 The bottom plate under the switchgear shall be plain; the MV connection cables cross it by holes matching their cross section in the locations provided by the manufacturer
 If the equipment is successfully tested with an arc deflector or equipped with the arc deflector kits corresponding to the BB50 configuration, its IAC class is recognized as its AA3x class, whatever the chosen assembly configuration (BB10, 20, 50). If the equipment is successfully tested equipped with arc deflector kits corresponding to a BB10 configuration or 20 or with channel, its IAC class is recognized as its AA3x class only in the corresponding assembly configurations.
The IAC AFL class tests must be performed in all compartments of each type of representative functional unit, K, T, D, RB, M, and P. However the validity of the results of the tests performed on a functional unit of a particular model of metal enclosed switchgear can be extended to another under condition that the first has been tested in the most restrictive conditions and that the next can be considered as similar to that tested for the following aspects: dimensions, structure and strength of the enclosure, partition architecture, pressure release device performance, insulation system.
Nevertheless type KxBZ, Mx functional units exclusively downstream of cell T are not considered representative.
3.8.5 Categories AA3x: special criteria
3.8.5.1 Category AA32:
The tests relating to the IAC AFL class performed on the AA31 apparatus are completed by identical tests in all the compartments equipped with an arc detection device but also for a test current less than 30% of the rated internal arc withstand current. The maximum time necessary for detection and metallic short circuit must be measured at the time of the test at 100% and at 30% of the rated internal arc current.
3.8.5.2 Category AA33:
The equipment must be tested in conformity with the requirements as described in the annex A of NBN EN
62271-200 for “special case, use of an exhausting duct”.
3.8.5.3 Category AA34:
The tests relating to the IAC AFL class are the combined tests for categories AA32 and AA33.
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3.8.6 Category AA35:
The IAC AFL class can have been demonstrated on the AA32 of the same apparatus.
In this case an additional of behaviour at the pressure value depending on the expansion volume must be performed. This value shall be determined by a simulation calculation validated by a body audited by
Synergrid.
The behaviour is verified either:
 By a test done with the help of any suitable system matched to the expansion volume(s)
 By finite element calculation (FEM)
The test pass criterion is demonstrated by continuation of the IP4X rating to the outside of the switchgear enclosure.
If the IAC class test is carried out on the AA35 switchgear, besides the test criterion provided by the standard, continuity of the IP4X rating towards the outside of the switchgear enclosure is also required.
3.8.7 Category AA40
The tests must be done in conformity with NBN EN 62271-202.
3.9.1 Introduction
This chapter describes the required tests for the approval of a complete protection chain for MV circuit breakers equipped with an over current and earth fault protection relay without auxiliary supply or dual power supply. The test on the complete protection chain is required for each possible and authorized combination of protection relays, CT, low burden tripping coil and MV circuit breaker subject to approval.
CT with different characteristics (e.g. ratio) are accepted as far as the complete protection chain complies with the requirements mentioned hereafter and that the over current and earth fault relay is compliant with the technical specification “Overcurrent relays without auxiliary supply” and hence is listed on Synergrid table
C10/20 “Approved over current protection relays”. The described tests need to be performed for each CT ratio of the product range proposed for approval.
The test on the complete protection chain consists of verifying the correct functioning of the protection for different types of fault currents (three phase faults and earth faults) for the complete operation range of the protection chain and this for different possible settings.
3.9.2 Protection chain comprising a protection relay without auxiliary supply
3.9.2.1 Standard primary current injection tests
The verification of the correct functioning of the complete protection chain through primary current injection has to cover the following situations:
•
Over current protection through 1-phase current injection with pre-powering through CTs
•
Over current protection through 1-phase current injection without pre-powering
•
Earth fault protection through 1-phase current injection
•
Earth fault protection with core balance CT through primary current injection (if applicable)
•
Over current protection through 3-phase current injection with pre-powering through CTs
•
Over current protection through 3-phase current injection without pre-powering
Each situation described here above has to be checked for at least three different current settings, being:
• minimum value of the current setting range,
• average value of the current setting range,
• maximum value of the current setting range, and this for two different time settings for the definite time (DT) curve :
• instantaneous,
• time delay of 1 second.
3.9.2.2 Specific primary current injection tests
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The zero-sequence over current protection function has to operate correctly with a primary current of 60 A injected in one phase only and without pre-powering. This test has to be performed on the protection chain comprising CTs (or core balance CT if applicable) with the highest ratio. The total tripping time has to be less than 200 milliseconds with instantaneous time setting in definite time (DT) mode.
The correct operation of the complete protection chain has to be verified by injecting a fault current of 20 kA with a time delay set to 1 second. This test has to be performed on the protection chain comprising CTs (and core balance CT if applicable) with the smallest ratio and the protection relay set to the highest possible threshold value.
The total measurement error on the complete protection chain at the minimum tripping threshold should be smaller than 8 % (5 % relay + 3 % CT) at primary rated current of the CTs.
3.9.3 Protection chain comprising a protection relay with dual power supply
In case of dual powered relays, the tests described under §2 above “protection relay without auxiliary supply” have to be performed for both supply modes thus without and with auxiliary supply.
3.9.3.1 Standard primary current injection tests
The verification of the correct functioning of the complete protection chain through standard primary current injection has to cover the situations as described under §2.1 above. In this case, pre-powering through CTs is not applicable.
However, only one point needs to be verified, being the minimum value of the current setting range with instantaneous time setting for the definite time (DT) curve.
3.9.3.2 Specific primary current injection tests
The verification of the correct functioning of the complete protection chain through specific primary current injection has to cover the situations as described under §2.2 above.
However, the test with a fault current of 20 kA is not mandatory
The total measurement error on the complete protection chain at the minimum tripping threshold should be smaller than 8 % (5 % relay + 3 % CT) at primary rated current of the CTs.
3.9.4 Test report
The test report has to contain the following information:
•
Information of the test object according NBN-EN62271-1 – Annex A: Manufacturer’s name, type designation, ratings, drawings and serial number for protection relay, CT, MV circuit breaker, MV circuit breaker operating mechanism, poles and trip coil.
•
Summary table with all test results: protection relay settings, injected current, measured tripping time
(CB included)
•
Mentioning of the MV circuit breaker opening time with respect to the tested version (same interrupter chamber, operating mechanism and trip coil)
•
Current measurement error at minimal tripping threshold
•
Pictures of the different tests setup
•
Pictures of the CT and MV circuit breaker rating plate, trip coil rating plate or datasheet.
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D Short-time withstand current and peak withstand current
I
This chapter is only applicable for metering panels and contains derogating and/or simplified requirements referring to chapter 3.
If nothing is mentioned, the prescriptions of chapter 3 are applicable.
The applied folder codes (C, D, E, …) are in accordance with the codes used in the conformity assessment guide, and the model zip file.
Fol der
TESTS
C Temperature rise
T
U Non-flammability
Q Internal arc
R Pressure behaviour
F
Tracking current
Pollution
Tightness test
References of the reports or justification notes appearing in the technical file
The test can be replaced with a note justifying the chosen conductor cross sections.
This test can be omitted:
 For the metering or voltage FU downstream of a protection by switch-fuse combination, under condition of a justification of the required performances.
 For cells not including bars whose length, geometry and attachment methods are such that they could present a risk of movement during the passage of a short circuit current.
Tracking current tests for the component insulating materials :Test preferably according to NBN EN 60587 (1A2.5 or higher). Nevertheless, a test to NBN EN 60112 (600 V) is equally acceptable without the benefit relating to the remark 1(Pollution) * below.
Non-flammability tests of the component insulating materials
On 3 samples of 3 mm (NBN EN 60695-2-12) or on apparatus (NBN EN
60695-2-11).
For metering or voltage cells downstream of a protection by switch-fuse combination an internal arc test is not mandatory if a justification of mechanical withstand is provided.
Test according to IEC/TS 62271-304 for pollution class 2 in the different variants of the metering cell (TT, CT model, number, arrangements, etc.)
* Remark 1:
For an approval request for a metering cell that has already been tested to CEI/TS 62271-304 and equipped with other instrument transformers, an exemption can be granted if these transformers have successfully passed the NBN EN 60587 test for the class 1A2.5, and if it is demonstrated that the cubicle arrangement and accessories do not introduce any additional degradation risk.
Remark 2:
For an approval request for a metering cell equipped with instrument transformers that have already been tested for class 2 in accordance with CEI/TS 62271-304 (ex-CEI/TS 60932) in another metering cell, an exemption can be granted if it is demonstrate that the modification of the geometry does not introduce an additional risk (reduction of insulation distances, CT and VT arrangements, local increase in electric field, condensation flow).
Pressure behaviour test according to NBN EN 50187 for compartments under gas pressure.
This test is not required as a type test if the enclosure is free of joints (no moving part, e.g. breaking unit control shaft pass through).
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Fol der
TESTS
C Temperature rise
D Short-time withstand current and peak withstand current
B Lightning strike
Error determination
U Incandescent wire
B Partial discharges
References of the reports or justification notes appearing in the technical file
On 1 example with a power of 5 to 15 VA or more in so far as the outside dimensions are identical. The test is valid for all rated primary currents less than that for the tested specimen.
On 1 example with 50/5 A or greater ratio in so far as the external dimensions are identical to those of the tested specimen for a 20 kA-1s ** short circuit current and power of 5 to 15 VA or more. The test is valid for CTs having the same number of primary spool pieces.
** Exception:
25 kA-1s in the case of decentralized production directly connected to the main substation or similar, or primary substation > 25 kA.
On 1 specimen with a power of 5 to 15 VA or more in so far as the external dimensions are identical for Ur = 17.5 kV.
On any type of measuring CT. A test report associated with the short time withstand test is acceptable.
On 3 samples of 3 mm (NBN EN 60695-2-12) or on device (NBN EN 60695-2-
11).
On 1 specimen of one type only
Fol der
TESTS
C Temperature rise
D Short-time withstand current and peak withstand current
B Lightning strike
References of the reports or justification notes appearing in the technical file
On 1 specimen with 15 to 50 VA or more in so far as the external dimensions are identical, for Ur 17.5 kV.
On 1 specimen with a power of 15 to 50 VA or more in so far as the external dimensions are identical, for Ur 17.5 kV.
Error determination
U Incandescent wire
On 1 specimen with Ur 17.5 or 24 kV, this TT having a power of 15 VA in so far as the external dimensions are identical and a rati o of 15400/√3 (or more) /
110/√3 (for the transformers between phase and earth). Tests on a transformer with ratio 11000/√3 (or more) / 110/√3 are accepted. The design and the external dimensions must be identical.
On any 1 type of VT. A test report associated with the short circuit test is acceptable.
On 3 samples of 3 mm (NBN EN 60695-2-12) or on device (NBN EN 60695-2-
11).
On 1 specimen of one type. B Partial discharges
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For circuit breakers with integrated protection the instantaneous breaking time defined below includes the total reaction time for the complete chain.
For circuit breakers with separate protection with auxiliary supply, the instantaneous breaking time must be
30 ms less than the times given below to be considered in this class.
4 classes of maximum instantaneous breaking duration on short circuit (I>>) are defined:
 F1:
 F2:
 F3:
 F4: instantaneous breaking time> 100 ms but always < 120 ms instantaneous break time > 80 ms but always < 100 ms. instantaneous break time > 50 ms but always < 80 ms. instantaneous break time < 50 ms
The measurement is performed during the making and breaking tests for the current corresponding to the
T10 sequence. The total breaking time is measured at 85 % of the rated a.c. voltage (or 70% of the rated d.c. voltage) of the trip coil.
The minimum asymmetric component to be broken is deduced from figure 9 of NBN EN 62271-100 for a 45 ms time constant.
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The circuit breakers are classified according to their operating limit :
 H1 = "limited thermal capacity" circuit breaker with restriction to use for general protection of network user or for transformer(s) protection, with ability to reclose after opening at minimum voltage tripping, but not automatically or remote on fault.
•
H1-40: operating limit 40 breaks by tripping, or CO operating cycles if the CO cycles counter does not discriminate on the opening mode.
•
H1-70:
•
H1-220: operating limit 70 breaks by tripping or CO operation cycles operating limit 220 breaks by tripping or CO operation cycles
Note 1: This is typically for DxT circuit breakers in RMU assemblies, extendable or not.
Note 2: the operating limit at a maximum number of CO cycles is calculated considering that the circuit breaker must break 4 times out of 5 at its rated current and once out of 5 at a short circuit current of 14 kA.
 H2 = unlimited thermal capacity circuit breaker.
Note 3: These are typically DxBE and DxN circuit breakers included in modular assemblies for general industrial protection.
 H3 = circuit breaker compatible with a fast reclosing cycle having proved an electrical endurance at least equivalent to that of list 1 or 3 of table 33 of the standard EN 62271-100.
Note 4: They are typically DxN circuit breakers included in modular assemblies and intended to protect distribution networks.
The maintenance frequency must take the H class into account:
 For class H1 circuit breakers the manual must provide and describe the checks to be done when the operating limit is reached (see break or operation counter). These checks consist as a minimum of checking the quality and pressure of the dielectric fluid (SF6, empty, etc.) by an appropriate method and checking the resistance of the closed contacts. The dielectric strength at the industrial frequency must always be guaranteed (80% of the rated strength) and the contact resistance must not have increased by more than 20% relative to the initial contact resistance measured during the routine test.
If this contact resistance is not mentioned on the device, the contact resistance Ru from the type test before temperature rise test should be taken by default. When the results of these checks are conclusive, the lifetime of the circuit breaker can be extended. This extension must be given in the manual, based on a number of breaks or CO operations, and is as a maximum equal to the number of authorised cycles for its class.
 For H2 class circuit breakers the maintenance frequency is defined by the manufacturer.
 Class H3 corresponds to maintenance-free circuit breakers.
Every circuit breaker must have undergone the basic short-time test sequences . According to the equivalent electrical load (i² multiplied by the number of openings) reached during the tests, the following operation classes shall be allocated to the circuit breaker:
 H1-40: for a circuit breaker having only undergone basic class E2 short-time test sequences, but without sequence T100a, according to the conditions of NBN EN 62271-100




H1-70:
H1-220:
H2:
H3:
(involving declaration of operating time corresponding to a continuous component less than 20% for a network time constant of 45 ms). for a circuit breaker having undergone only the basic short circuit test sequences of class E2. for a circuit breaker of class E2 having undergone the test sequence of the list 3 of table 33 of standard EN 62271-100 . for a class E2 circuit breaker having undergone basic short circuit test sequences
O-0.3s-CO-15s-CO. for a class E2 circuit breaker having undergone basic short circuit test
 sequences O-0.3s-CO-15s-CO completed by the test sequence of the list 3 of table 33 of standard EN 62271-100
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