DSH 525/541/546（IEC 60065）測量間隙時的內(nèi)部零部件推力/變壓器過載/相對濕度

DSH 525

Subject: Applied force for internal parts

Question:

In clause 13.2, it is specified that 2N for internal parts and 30N for the outside are applied simultaneously while taking measurement of clearance. However, it is not specified that forces are applied to internal parts while taking measurements between two internal parts, ex. primary circuit component and secondary circuit component.

Which is the appropriate method to measure clearance between two internal parts ?

a) 2N forces are applied to the both parts simultaneously.

b) First, a 2N force is applied to one part and removed. And then a 2N is applied to the other one.

c) Other opinion

Decision:

First, a 2N force is applied to one part and removed. Then a 2N force is applied to the other part.

問題：

13.2條款規(guī)定在測量間隙時，內(nèi)部零部件施加2N同時外殼施加30N。然而在測量兩個內(nèi)部零部件（例如一次電路部件和二次電路部件）時，沒有規(guī)定對內(nèi)部零部件施加的力。

測量兩個內(nèi)部零部件間隙的合適方法是什么？

a）兩部分同時施加2N的力。

b）先在一個部件上施加2N的力后移開，然后另一個部件上再加2N力。

c）其他意見。

決定：

先在一個部件上施加2N的力后移開，然后另一個部件上再加2N力。

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DSH 541

Subject: Transformer overload

Question:

The standard does not specify a transformer overload test, as there is, , for example, in IEC 60950.

If it is obvious, based on engineering judgment of the technical design of the product, that due to a single fault condition (e.g. component failures, short circuit of functional insulation) an overload situation on a transformer is likely to occur, which approach should be followed?

1) The actual overload on the transformer shall be performed, taking into account the 'characteristics' of eventual protective devices.

2) All possible single fault conditions shall be performed. For those situations where the protective device reacts, the current through the protector shall be measured and the characteristic of the protector shall be taken into account.

3) No overload condition shall be created, since the standard does not specify this in wording.

4) Other possibilities.

Decision:

Following the standard option 2 from above has to be used.

問題：

標(biāo)準(zhǔn)沒有與IEC 60950-1類似規(guī)定，要求變壓器過載試驗。

如果依據(jù)產(chǎn)品的技術(shù)設(shè)計判斷，由于單一故障情況（如元器件故障、功能絕緣短路），變壓器很可能發(fā)生過載情況，應(yīng)采取哪一種方法？

1）變壓器的實際過載應(yīng)考慮到最終保護(hù)裝置的“特性”。

2）應(yīng)執(zhí)行所有可能的單一故障條件。當(dāng)保護(hù)裝置動作時，測量通過保護(hù)裝置的電流，并考慮保護(hù)裝置的特性。

3）不應(yīng)產(chǎn)生過載條件，因為標(biāo)準(zhǔn)沒有明文規(guī)定。

4）其他的可能性。

決定：

必須使用上面的標(biāo)準(zhǔn)選項2。

提示：

變壓器過載是最壞的故障情況，如果有發(fā)生這種情況的可能性，變壓器和最終使用的保護(hù)裝置的應(yīng)確保過載不會導(dǎo)致火災(zāi)或觸電危險。

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DSH 546

Subject: Relative humidity

Question:

Various IEC standards require that specific tests be performed in a humidity chamber. The specification of the relative humidity is in several formats. How should the tolerance on the relative humidity specification be interpreted?

Decision:

(1) Unless clearly noted otherwise, the tolerance specified for humidity is considered to be in percent relative humidity, % RH.

(2) It is intended that the set point of the humidity chamber controller be set within the specified range and that the humidity remains within the specified range.

(3) Confirmation that humidity is within the specified range shall be made by a humidity measuring instrument according to CTL DSH 251A.

問題：

各種IEC標(biāo)準(zhǔn)要求在濕度室中進(jìn)行特定的試驗。相對濕度的規(guī)格有幾種格式。相對濕度規(guī)格上的容差應(yīng)如何解釋？

決定：

（1）除非另有明確說明，指定的濕度容差被認(rèn)為是百分比相對濕度，% RH。

（2）濕度室控制器的設(shè)定點應(yīng)設(shè)定在規(guī)定的范圍內(nèi)，濕度保持在規(guī)定的范圍內(nèi)。

（3）濕度在規(guī)定范圍內(nèi)，由濕度測量儀根據(jù)CTL DSH 251A進(jìn)行確認(rèn)。

提示：

CTL DSH 251已經(jīng)被OD-5014替換，見以下鏈接

DSH 2106測量儀器有效性+OD-5014儀器精度要求

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