CN103512652A

CN103512652A - Boundary background noise testing method suitable for transformer substation during operation

Info

Publication number: CN103512652A
Application number: CN201310415170.1A
Authority: CN
Inventors: 胡胜; 陈绍艺; 李铁楠
Original assignee: State Grid Corp of China SGCC; Electric Power Research Institute of State Grid Hunan Electric Power Co Ltd; Hunan Xiangdian Test Research Institute Co Ltd
Current assignee: State Grid Corp of China SGCC; Electric Power Research Institute of State Grid Hunan Electric Power Co Ltd; State Grid Hunan Electric Power Co Ltd
Priority date: 2013-09-12
Filing date: 2013-09-12
Publication date: 2014-01-15
Anticipated expiration: 2033-09-12
Also published as: CN103512652B

Abstract

The invention discloses a boundary background noise testing method suitable for a transformer substation during operation. The geometric center of a transformer is utilized as an end point, in the radial direction of a testing point of boundary noise of the transformer substation, the testing point of the boundary noise of the transformer substation is utilized as a first testing point, a second testing point and a third testing point are arranged at equal intervals in the direction far away from the transformer substation, noise values of the three testing points are tested simultaneously, the boundary background noise is appropriately simplified, and the boundary background noise of the transformer substation is reversely calculated by means of a noise degeneration formula and a superposition formula. According to the method, under the circumstance that operation of the transformer substation is not affected, the boundary background noise of the transformer substation is rapidly and accurately tested. The method is simple, practical and easy and convenient to operate. An existing noise-measuring instrument can be used for test, and cost is low.

Description

A kind of substation operation Shi factory circle ground unrest method of testing that is applicable to

Technical field

The present invention relates to field of environment engineering technology, particularly a kind of substation operation Shi factory circle ground unrest method of testing that is applicable to.

Background technology

The resident that ，You transformer station noise causes in recent years complains and dispute is on the increase, and therefore needs factory circle of Accurate Determining transformer station neighbourhood noise discharge value, thereby assess it, whether meets national standard requirement.According to the regulation in " Industrial Enterprise Factory Boundary neighbourhood noise emission standard ", factory's circle neighbourhood noise discharge value of transformer station obtains after should revising measured value according to the size of difference between measured value and ground unrest value.Measured value can measure easily, but it is social life and the task of producing power supply that transformer station is undertaking, generally the noise source equipment such as the main-transformer in transformer station can not be stopped transport, this also causes accurately measuring factory's circle ground unrest of transformer station, also just cannot obtain factory circle of transformer station neighbourhood noise discharge value accurately.

The L90 that now often gets measuring point replaces factory circle of transformer station ground unrest, but because transformer station's noise is generally continuous and steady operation, therefore adopts L90 to replace factory circle of transformer station ground unrest often larger with actual conditions difference.

Summary of the invention

Technical matters to be solved by this invention is, not enough for prior art, and a kind of substation operation Shi factory circle ground unrest method of testing that is applicable to is provided, and in the situation that not affecting substation operation, measures fast and accurately factory's circle ground unrest of transformer station.

For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of substation operation Shi factory circle ground unrest method of testing that is applicable to, and the method is:

1) take that transformer geometric center point is end points and being the first measuring point through factory circle of the directions of rays ，Yi transformer station noise measuring point of factory circle of transformer station noise measuring point, toward direction disposed at equal distance the second measuring point and the 3rd measuring point away from transformer station;

2) measure the actual noise value of three measuring points simultaneously;

3) make the ground unrest value of three measuring points identical;

4) by experimental formula and the noise Superposition Formula of transformer far-field radiation noise, set up the model of the distance of transformer noise sound pressure level in ground unrest Zhi, transformer station of factory circle of transformer station, transformer Ju Chang circle noise measuring point, thereby solve ground unrest value.

In ground unrest Zhi, transformer station of factory circle of described step 4) Zhong， transformer station, the model of the distance of transformer noise sound pressure level, transformer Ju Chang circle noise measuring point is:

Wherein, L _nfor ground unrest value, L _pfor the noise sound value of being contributed by transformer apart from transformer outside surface 1m place (dB (A)), x is the distance (m) between the first measuring point and transformer outside surface, L ₁be the actual noise value of the first measuring point, L ₂be the actual noise value of the second measuring point, L ₃be the actual noise value of the 3rd measuring point, s is the total area (m of 4 tank walls of oil tank of transformer ²).

Distance between adjacent two measuring points is 2～5m.

Wherein ，Chang circle generally refers to apart from the enclosure wall Yi meter of transformer station border ，Chang circle noise measuring point and is generally set in factory circle, and higher than 0.5 meter, transformer station's enclosure wall.

In step 4), because most transformer station does not all have special sound source around, ground unrest generally changes little in close range, therefore it is identical to set the ground unrest value of three measuring points.

The experimental formula of transformer far-field radiation noise is:

L_{x} = L_{p} - 20 \lg (x / \sqrt{s}) - 8, x > \sqrt{s}

Wherein, L _pfor the noise sound value of being contributed by transformer apart from transformer outside surface 1m place (dB (A)), x is the distance (m) of transformer outside surface distance the first measuring point, and s is the total area (m of 4 tank walls of oil tank of transformer ², according to transformer model, can determine), L _xfor the noise sound value (dB (A)) of being contributed by transformer when transformer outside surface distance is x.

Noise Superposition Formula is:

10 \lg (10^{(0.1 \times L_{x})} + 10^{(0.1 \times L_{n})}) = {L_{x}}^{'}

Wherein, L _xfor the noise sound value (dB (A)) of being contributed by transformer when transformer outside surface distance is x, L _nfor ground unrest value, L _x' be the noise of being contributed by transformer during for x and the sound pressure level value (dB (A)) of ground unrest stack apart from transformer outside surface distance.

Compared with prior art, the beneficial effect that the present invention has is: the present invention can, in the situation that not affecting substation operation, measure factory's circle ground unrest of transformer station rapidly and accurately; The method is simple and practical, easy to operate; Can utilize existing noise-measuring instrument to test, cost is low.

Accompanying drawing explanation

Factory circle of Tu1Wei transformer station ground unrest test measuring point is arranged sectional view;

Factory circle of Tu2Wei transformer station ground unrest test measuring point is arranged vertical view.

Embodiment

According to measuring point method for arranging shown in Fig. 1 and Fig. 2, the present invention implements in the ground unrest test of Changsha factory circle of 110kV transformer station, and the method for embodiment is:

1) take that transformer geometric center point is end points and being measuring point 1 through factory circle of the directions of rays ，Yi transformer station noise measuring point of factory circle of transformer station noise measuring point, toward the direction away from transformer station, every 2 meters, arrange measuring points 2 and measuring point 3;

2) the actual noise value that records 3 measuring points laying in step 1) while adopting multi-channel noise tester simultaneous, records 3 measuring point noise figures and is respectively 51.9dB (A), 50.7dB (A), 49.6dB (A);

3) this transformer station does not have the special sound sources such as factory, ground unrest to be mainly the residential quarter life background sound of distribution uniform around, and the ground unrest value that therefore can be simplified to 3 measuring points is identical;

4) ground unrest value is calculated: by experimental formula and the noise Superposition Formula of transformer far-field radiation noise, and step 2) in the actual noise value that records set up system of equations, solve factory circle of transformer station ground unrest value.

Ground unrest solving equation group is as follows:

Wherein, L _nfor ground unrest value, L _pfor the noise sound value apart from transformer outside surface 1m place (dB (A)), x is transformer outside surface apart from the distance (m) of the first measuring point, and s is that (general 110kV transformer is got 50m for the total area of 4 tank walls of oil tank of transformer ²).

To above-mentioned solving equations, can solve ground unrest value is 39.1dB (A), and after stopping transport with transformer, actual measurement ground unrest value 39.3dB (A) compares, and both differences are less than 0.5dB (A), can meet the demands.

Claims

1. be applicable to a substation operation Shi factory circle ground unrest method of testing, it is characterized in that, the method is:

2) measure the actual noise value of three measuring points simultaneously;

3) make the ground unrest value of three measuring points identical;

2. the substation operation Shi factory circle ground unrest method of testing that is applicable to according to claim 1, it is characterized in that, in ground unrest Zhi, transformer station of factory circle of described step 4) Zhong， transformer station, the model of the distance of transformer noise sound pressure level, transformer Ju Chang circle noise measuring point is:

Wherein, L _nfor ground unrest value, L _pfor the noise sound value of being contributed by transformer apart from transformer outside surface 1m place, x is the distance between the first measuring point and transformer outside surface, L ₁be the actual noise value of the first measuring point, L ₂be the actual noise value of the second measuring point, L ₃be the actual noise value of the 3rd measuring point, s is the total area of 4 tank walls of oil tank of transformer.

3. the substation operation Shi factory circle ground unrest method of testing that is applicable to according to claim 1 and 2, is characterized in that, the distance between adjacent two measuring points is 2～5m.

4. the substation operation Shi factory circle ground unrest method of testing that is applicable to according to claim 3, is characterized in that, the distance between adjacent two measuring points is 2m.