GB/T 30842-2014Electromagnetic shielding effectiveness specification and measuring method for high voltage testing enclosures (English PDF)

GB/T 30842-2014 is the English-translated version of 高压试验室电磁屏蔽效能要求与测量方法.

GB/T 30842-2014 fixes how well a high voltage test chamber must shield electromagnetically and how that shielding is to be measured.

Clause 1 states that the standard specifies the shielding effectiveness requirements and the measurement methods inside the chamber over the 10 kHz to 3 GHz frequency range, that the frequency can be extended to 10 GHz, and that it applies to the evaluation and measurement of the electromagnetic shielding effectiveness of high voltage laboratories.

Clause 3 takes its terms from GB/T 4365 and adds three: shielding effectiveness, as the measure of a shield's ability to isolate or limit electromagnetic waves, usually expressed as the ratio of the incident to the transmitted wave magnitude in decibels; the high voltage test chamber, as an electromagnetically shielded facility specially designed for testing high-voltage power equipment; and the testing area of that chamber, the region in which the device under test is placed and tested.

Clause 4 divides high voltage test chambers into four categories according to use, described in Annex C, sets the shielding effectiveness requirements in Table 1 and adds requirements on insulation resistance and grounding resistance.

Clause 5 carries the general requirements, covering the measurement environment, the measurement equipment and antennas, the measurement frequencies and the calculation of shielding effectiveness.

Clause 6 gives the measurement itself, with the requirements on the chamber being measured, the shielding effectiveness measurement method, the measurement of high voltage electric field shielding attenuation and the determination of the measurements.

Annex A, the only normative annex, holds the requirements and measurement methods for insulation resistance and grounding resistance, while the informative Annex B covers the high voltage electric field shielding attenuation measurement and Annex C the classification of the chambers.

The draft breaks off early in clause 4, so the shielding effectiveness values of Table 1 and the measurement procedures are not shown. It was issued on 24 June 2014 and has applied since 22 January 2015.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 20 pages — is available in the English PDF.

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