CN104634442A - Method for indirectly measuring noise of transformer - Google Patents
Method for indirectly measuring noise of transformer Download PDFInfo
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- CN104634442A CN104634442A CN201510009678.0A CN201510009678A CN104634442A CN 104634442 A CN104634442 A CN 104634442A CN 201510009678 A CN201510009678 A CN 201510009678A CN 104634442 A CN104634442 A CN 104634442A
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Abstract
In the measurement of the transformer noise, the requirement for the peripheral background noise is very high, the noise value measured in a special noise measurement room is the noise of the transformer, in an operation field, the noise measured in a conventional method is the noise generated by all noise sources in the site due to the affection of the peripheral environment and the noise of other equipment and is not just the noise value independently generated by the transformer, so that the measurement value of the noise of the transformer is great in error. The noise of the transformer is produced by the vibration of an iron core due to the magnetostriction and the vibration of a transformer winding under the electromagnetic field effect in a leakage magnetic field, and the vibration of a transformer part is directly relates to the noise. If the noise generated by the transformer is indirectly calculated by virtue of a vibration signal on the surface of the transformer, the affection of the environmental noise and the noise of other equipment can be avoided, and the measurement result is the noise generated by the transformer.
Description
Technical Field
The invention relates to a method for indirectly measuring noise generated during the operation of a transformer.
Background
With the development of high-voltage direct-current transmission, the influence of noise generated by the operation of a transformer substation and a converter station on the surrounding environment is more and more serious, and the noise generated by the vibration of a transformer is one of important noise sources, so that the operation noise problem of the transformer becomes an important noise source influencing the surrounding environment. Particularly, when harmonic magnetic flux exists in a transformer core and harmonic current flows in a transformer winding, the vibration of the transformer core and the transformer winding is more complicated, and when the excitation frequency of the transformer core and the excitation frequency of the transformer winding are equivalent to the structural natural frequency, a resonance phenomenon occurs, so that the transformer emits stronger noise.
In the transformer noise measurement, the requirement on the background noise of the surrounding environment is very strict, the noise value of the transformer measured only in a special noise measurement laboratory is the noise emitted by the transformer, the noise is influenced by the noise of the surrounding environment on the transformer operation site, and the noise of other power equipment is also influenced.
The noise of the transformer is caused by the iron core vibration generated by the magnetostriction of the iron core of the transformer and the vibration generated by the electromagnetic force applied to the winding of the transformer in the leakage magnetic field, the noise of the transformer is generated by the transmission of the vibration of the iron core and the winding of the transformer, and the vibration of the transformer component and the noise level have a direct relation. Because the direct measurement of the noise of the transformer has the limitations of many conditions, if the size of the noise radiated by the transformer is indirectly calculated through the vibration signal on the surface of the transformer, the mutual influence of the environmental noise and the noise of other power equipment can be avoided, and the measurement result is the noise actually generated by the transformer.
Disclosure of Invention
The invention provides a transformer vibration test system which can measure the real-time condition of vibration of each part of a transformer core and a winding.
The transformer vibration experiment test system comprises seven piezoelectric vibration acceleration sensors which are attached to a transformer core and a winding through magnetic poles and used for testing real-time vibration signals of the transformer core and the winding.
And the two signal conditioning modules are used for receiving signals detected by the piezoelectric vibration acceleration sensor, and the transmitted vibration signals are filtered and amplified by the signal conditioning modules.
And the vibration signal display terminal receives the vibration acceleration data filtered and amplified by the signal conditioning module.
The method for indirectly measuring the noise of the transformer through the transformer vibration test system comprises the following specific steps:
(1) it can be seen from the above mechanism of transformer noise generation that, because the noise radiated from the transformer casing is closely related to its vibration, when calculating the noise generated by the transformer, it can be calculated from the vibration response of the casing under the action of the electromagnetic vibration force.
(2) Vibration signals of corresponding points measured by vibration acceleration sensors attached to the surfaces of the transformer core and the winding are transmitted to the signal conditioning module, the vibration acceleration signals are filtered and amplified through the signal conditioning module, and finally the conditioned acceleration signals are transmitted to a display terminal to obtain acceleration signals of each vibration measurement point.
(3) When the transformer is subjected to vibration testing, the piezoelectric vibration acceleration sensor is usually adopted to measure the vibration acceleration of the surface of the transformer, and the piezoelectric vibration acceleration sensor has the advantages of small volume, light weight, wide working frequency and the like, so that the measurement can be carried out in a complex electromagnetic environment, and then the noise signal of the transformer is obtained through calculation.
(4) In order to comprehensively acquire vibration signals on the surface of the transformer, 7 measuring points are arranged on the surface of the transformer, and vibration acceleration signals of the points are respectively measured by attaching the vibration acceleration sensor to the surface of the transformer through magnetic poles.
(5) And calculating the level of the radiated noise according to the surface vibration signal of the transformer, establishing a transformer vibration test system, measuring the surface vibration signal of the transformer, and further calculating to obtain the level of the sound power level of the noise.
In the vibration testing system, the main signal conditioning module is a vibration acceleration signal conditioning block which is connected with a vibration acceleration sensor attached to the surface of the transformer through a connecting wire, collects the real-time vibration acceleration condition from the surface of the transformer, and amplifies and filters the vibration acceleration.
And the signal conditioning module is connected with the final acceleration signal display terminal through a transmission line.
The invention adopts the vibration acceleration signals of all surfaces of the measuring transformer to indirectly measure the noise value of the measuring transformer, can avoid the influence of noise of other power equipment with various sources in space on the measured value, and can more accurately and scientifically determine the noise value of the measuring transformer.
Drawings
The following figures are used to explain the principle and process of indirectly measuring and calculating the noise of the transformer through the vibration acceleration test in detail;
fig. 1 is a schematic structural diagram of a transformer to be tested according to the present invention, fig. 2 is a diagram of a real object of the transformer to be tested and an installation position of a vibration acceleration sensor, and fig. 3 is a schematic structural diagram of a whole transformer vibration acceleration testing system according to the present invention.
Detailed Description
And testing each point of the single-phase four-column dry-type transformer by vibration acceleration.
FIG. 1 shows a schematic diagram of the structure of a test transformer; FIG. 2 is a diagram of a transformer under test and a vibration acceleration sensor mounted in a vibration test system, in which the vibration acceleration sensor is attached to each surface of the transformer to detect vibration signals of each point in real time; the signals measured by the vibration acceleration in fig. 3 are transmitted to the 482C05 signal conditioning module through the transmission line for signal filtering and amplification, and the display terminal of the MR8857 signal storage recorder is connected with the signal conditioning module for receiving the vibration acceleration signals processed by the conditioning module.
The vibration test system for indirectly deducing the noise of the transformer through the vibration acceleration signal on the surface of the transformer specifically measures according to the following steps:
(1) the physical quantity representing the vibration intensity comprises a vibration acceleration level and a vibration speed level; (2) vibration acceleration levelIs defined as:
；
wherein,the effective value representing the vibration acceleration (unit:）；
is a reference value of vibration acceleration(unit:）；
(3) vibration velocity levelIs defined as:
；
wherein,an effective value representing the vibration speed (unit:）；
is a reference value of vibration speed(unit:）；
(4) the following derivative relationship exists between the vibration acceleration and the vibration speed:
；
it can therefore be derived that the following relationship exists between the vibration acceleration level and the vibration velocity level:
；
(5) when the transformer is in operation, the surface of each component of the transformer generates vibration, and the following relationship exists between the surface vibration and the radiated sound power:
；
wherein,which represents the value of the air density,representing the speed of sound in air, combined in a noise analysisCalled the air acoustic impedance (unit:）；the surface area for outward radiation of noise (unit:）；is an effective value of the vibration speed of the vibration surface (unit:）；is the radiation ratio.
(6) The sound power level can represent the intensity of noise and the sound power levelIs defined as:
；
as the value of the sound power radiated from the vibration surface (unit:）；
in order to be the reference acoustic power,；
(7) the following relationship exists between the sound power level and the vibration acceleration level:
；
in the formula,referred to as the air acoustic impedance (unit:），is the acoustic impedance of reference air, the value of which；The surface area for outward radiation of noise (unit:），is a reference area, the value of which；In order to be the ratio of the radiation,is a reference radiation ratio, the value of which；Is a value of the vibration acceleration frequency (unit:）；
(8) when measuring the noise of a certain surface of a transformer, the surface is divided intoFor the parts with equal area, the vibration acceleration level of each part is calculated due to the difference of the vibration acceleration level of each part, and then the average value of the vibration acceleration levels is calculated as the vibration acceleration level value in the above formula, namely:
；
is the average value of the vibration acceleration level,is as followsPartial vibration acceleration level.
(9) The final sound power level is:
。
Claims (4)
1. Vibration signals measured by piezoelectric vibration acceleration sensors attached to the surfaces of the transformer core and the winding are transmitted to the signal conditioning module, the vibration acceleration signals are filtered and amplified through the signal conditioning module, and finally the conditioned acceleration signals are transmitted to a display terminal to obtain acceleration signals of each vibration measuring point.
2. In the vibration testing system, the main signal conditioning module is a vibration acceleration signal conditioning module, is connected with the vibration acceleration sensor attached to the surface of the transformer through a connecting wire, collects the real-time vibration acceleration condition from the surface of the transformer, and amplifies and filters the vibration acceleration.
3. The invention adopts the vibration acceleration signals of the measured points of the measuring transformer to indirectly measure the noise value of the measuring transformer, and can avoid the influence of the noise of other power equipment with various sources in the space on the measured value, thereby more accurately and scientifically determining the noise value of the measuring transformer.
4. And calculating the level of the radiated noise according to the surface vibration signal of the transformer, establishing a transformer vibration test system, measuring the surface vibration signal of the transformer, and further calculating to obtain the level of the sound power level of the noise.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510009678.0A CN104634442A (en) | 2015-01-09 | 2015-01-09 | Method for indirectly measuring noise of transformer |
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| CN201510009678.0A CN104634442A (en) | 2015-01-09 | 2015-01-09 | Method for indirectly measuring noise of transformer |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107576379A (en) * | 2017-08-07 | 2018-01-12 | 国家电网公司 | A kind of oil-filled transformer body noise-monitoring equipment and method |
| CN108593093A (en) * | 2018-03-14 | 2018-09-28 | 中国电力科学研究院有限公司 | Extra-high voltage transformer acoustical power on-site measurement method |
| CN109405953A (en) * | 2018-10-19 | 2019-03-01 | 全球能源互联网研究院有限公司 | A kind of vibration and noise test method of oil-immersed type power reactor |
| CN109405961A (en) * | 2018-10-19 | 2019-03-01 | 中车株洲电力机车有限公司 | A kind of calculation method of floor of railway vehicle structure-borne sound, apparatus and system |
| CN111060193A (en) * | 2019-11-28 | 2020-04-24 | 中国电力科学研究院有限公司 | Device and method for measuring acoustic power of extra-high voltage shunt reactor body |
-
2015
- 2015-01-09 CN CN201510009678.0A patent/CN104634442A/en active Pending
Non-Patent Citations (3)
| Title |
|---|
| "变压器的噪声 ", 《变压器》 * |
| 曹涛: "基于振动信号的电容器噪声水平计算方法", 《电工技术学报》 * |
| 程金英: "电力电容器噪声辐射比的测量方法研究", 《全国学位论文全文库》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107576379A (en) * | 2017-08-07 | 2018-01-12 | 国家电网公司 | A kind of oil-filled transformer body noise-monitoring equipment and method |
| CN108593093A (en) * | 2018-03-14 | 2018-09-28 | 中国电力科学研究院有限公司 | Extra-high voltage transformer acoustical power on-site measurement method |
| CN108593093B (en) * | 2018-03-14 | 2021-07-02 | 中国电力科学研究院有限公司 | Ultra-high voltage transformer acoustic power field measurement method |
| CN109405953A (en) * | 2018-10-19 | 2019-03-01 | 全球能源互联网研究院有限公司 | A kind of vibration and noise test method of oil-immersed type power reactor |
| CN109405961A (en) * | 2018-10-19 | 2019-03-01 | 中车株洲电力机车有限公司 | A kind of calculation method of floor of railway vehicle structure-borne sound, apparatus and system |
| CN111060193A (en) * | 2019-11-28 | 2020-04-24 | 中国电力科学研究院有限公司 | Device and method for measuring acoustic power of extra-high voltage shunt reactor body |
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Effective date of registration: 20160316 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: State Grid Hunan Electric Power Company Applicant after: HUNAN HUADA UNISPLENDOUR TECHNIC CORPORATION LIMITED Address before: 410205 Hunan province Changsha Changsha city high tech Development Zone Lusong Lu Valley Road No. 456 Applicant before: HUNAN HUADA UNISPLENDOUR TECHNIC CORPORATION LIMITED |
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Application publication date: 20150520 |