GB/T 32524.2-2016 in English
VALIDAcoustics—Determination of sound power level and directivity character of power capacitor using sound pressure—Part 2: Engineering methods for an essentially free field over a reflecting plane
- Issued on:2016-02-24
- Implemented on:2016-09-01
- File Format:PDF
- Delivery:Via email within 5 business days
$534.00
| Standard No: | GB/T 32524.2-2016 |
| Document status: | VALID |
| Title in English: | Acoustics—Determination of sound power level and directivity character of power capacitor using sound pressure—Part 2: Engineering methods for an essentially free field over a reflecting plane |
| Title in Chinese: | 声学 声压法测定电力电容器单元的声功率级和指向特性 第2部分：反射面上方近似自由场的工程法 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2016-02-24 |
| Implemented on: | 2016-09-01 |
| ICS Classification: | 17.140-Acoustics and acoustic measurements |
| Professional Classification: | GB-National Standard |
| Related Keywords: | sound power level
a-weighted sound power level power capacitor power capacitor units sound pressure part |
| Related Topics: | GB/T 32524.2
GB/T 32524.2-2016 Acoustic directivity test |
《GB/T 32524.2-2016声学 声压法测定电力电容器单元的声功率级和指向特性 第2部分：反射面上方近似自由场的工程法》由TC17（全国声学标准化技术委员会）归口，主管部门为中国科学院。
Introduction
Analysis of the core content of the standard
This part specifies the engineering method for determining the sound power level of power capacitor units through a parallelepiped measuring surface in an approximately free field environment above a reflecting surface. The measurement uncertainty meets the requirements of Level 2 of GB/T 19052. The test frequency range covers the 125Hz-2000Hz octave band or the 100Hz-3150Hz 1/3 octave band.
Comparison of key technical requirements
| Dimensions | Engineering method requirements | Precision method differences |
|---|---|---|
| Measurement distance | Fixed 1m | Adjustable |
| Background noise correction | ΔLp≥6dB | ΔLp≥15dB |
| Environmental correction K2 | ≤4dB | ≤0.5dB |
Key points for test implementation
Typical test scenario
The AC filter capacitor unit of a converter station was tested under the following conditions:
- Installation method: suspended in a semi-anechoic chamber, with the bottom 0.8m away from the reflecting surface
- Loading conditions: power frequency current 50Hz/100A + harmonic current (250Hz/5A, 350Hz/3A)
- Measurement surface: parallelepiped, 9 measuring points arranged
The A-weighted sound power level was measured to be 72.0±2.9dB(k=2), and the directional characteristics showed that the terminal surface had the strongest radiation.
Measurement uncertainty analysis
Calculation formula of expanded uncertainty U:
U = k√(σ²R0 + σ²omc)
Wherein:
- σR0=1.5dB (method reproducibility)
- σomc=0.28dB (operating condition fluctuation)
- k=2(95% confidence level)
Background of standard evolution
This standard is based on international standards such as IEC 62477, optimizes the measurement method for discrete sound characteristics of power capacitors, and solves the shortcomings of early standards in the following aspects:
- Harmonic current injection requirements are not clear
- Lack of installation posture specifications
- Pointing characteristics are not fully characterized
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