17c-kista-sec03 interlock tests iec 62271-200 for kista-revised

8/18/2019 17C-Kista-Sec03 Interlock Tests IEC 62271-200 for Kista-revised

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Edgar Dullni

Mechanical

interlock test

SC 17C general meeting

December 2015

Kista


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• The interlocking tests on switchgear andcontrolgear acc to IEC 62271-200 Ed. 2 are notdefined in all details and may lead to uncertaintywith respect to the test procedure.

• Some testing authorities always apply 750 N to theoperating shaft when the interlock is blocking theshaft (clause 6.102.2), though the operating shaftmay require far lower operating forces in particularfor multi-turn mechanisms.

Since clause 5.104 of IEC 62271-200 refers to IEC62271-102 (e.g. when a removable part is intended tobe moved more often), IEC 62271-200 and IEC 62271-102 should have the same requirements onoperating forces and perhaps also on interlocktesting forces.


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• Clause 5.11 (new):

If mechanical interlocking devices are provided blocking

the operating shaft, they shall be designed to withstand:

during manual-operation, 3 times the maximum forces

given for manual operation in 5.105*)

(without consideringpeak values) or, if a strain limiting device is present, to 1,5

times its limiting value.

In the moment, IEC 62271-102 excludes disconnectors and

earthing switches covered by switchgear and controlgear

assembly standards (e.g. IEC 62271-200, IEC 62271-201 andIEC 62271-203) from these requirements.

The question is whether such a cross-reference is appropriate or

should rather be removed from both standards.

*) Text provided at the end of the presentation


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• Clause 6.102.2: Mechanical and electromechanical

interlocks

• During the tests double the normal forces shall be employed,

except that in the case of an interlock blocking the operating

shaft, a prospective force of 750 N shall be applied halfway

along the length of the gripping part of the operating handle.

This requirement does not consider different applicable operating

forces for switching device requiring one revolution or more than

one revolution (multi-turn) for its operation.

• IEC 62271-102 provides operating forces:

for one turn devices 250 N up to 450 N peak over 15°

for multi-turn devices 60 N up to 120 N peak over 10%


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•

Shall the applicable force to test an interlock blocking theoperating shaft be always 750 N irrespective of the

actually required operating forces being below 60 N for

multi-turn devices?

• Or should the applicable test force be proportional to the

operating force?

Factor to be determined in correspondence to 2nd CD of IEC

62271-102 cl. 5.11, for example?

• Shall the requirements and procedures for the test of

interlocks in IEC 62271-200 be revised in general?

Work could be performed as an amendment.

• Should IEC 62271-102 define any interlocking tests, or

should these be a domain of assembly standards?


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Edgar Dullni

Mechanical

interlock test

SC 17C general meeting


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• Maximum forces for manual operation exerted on an

operating shaft:

Clause 5.105.1:

The force to operate or sto re energy in a disc onnector

requir ing more than one revolut ion (hand c rank for

example) shal l not be high er than 60 N with a poss ible

peak of 120 N du ring a maximum of 10 % of the total

required revolut io ns .

Clause 5.105.2:The force to operate or store energy in a disco nnector

requir ing up to one revolut ion (sw ing lever for

example) should no t exceed 250 N. A peak value of 450

N is accepted duri ng a rotatio n of 15°maximum .

17c-kista-sec03 interlock tests iec 62271-200 for kista-revised

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