Collapsible volume array type low-frequency transformer substation noise nephogram test device and test method

Abstract

The invention discloses a Collapsible volume array type low-frequency transformer substation noise nephogram test device and a test method. The device comprises a movable pedestal, a fixed disk, a floating disk and several array arms; the fixed disk is mounted on the movable pedestal through a mounting rack, a track is arranged on the fixed disk, the floating disk is mounted on the track, and a camera is arranged on the fixed disk; each array arm is connected on the fixed disk through hinge joint, each array arm is connected with the floating disk through one connection rod, and two ends of the connection rod are respectively connected with the array arm and the floating disk through hinge joint; each array arm is provided with several sound sensors; and the camera and a signal output endof each sound sensor both are connected with a data acquisition processing device. The array arms of the device provided by the invention can be collapsed and keep constant size, movement of the wholedevice can be realized through the movable pedestal, a virtual large-size array can be synthesized through phase compensation and special position compensation, and consequently, relatively accuratetest for the low-frequency noise in the transformer substation can be realized.

Description

technical field [0001] The invention belongs to the technical field of substation noise testing, in particular to a shrinkable volume array low-frequency substation noise cloud image testing device and testing method. Background technique [0002] Accurate separation and measurement of substation internal noise is the key to the control and prevention of substation environmental noise. However, the measurement of substation noise is affected by external environmental factors, including background noise and weather. In the actual measurement, in addition to the noise generated by the sound source under test, there will also be other noises, such as the impact of noise from living and working backgrounds such as the flow of people and traffic around the substation, as well as transient noises such as dog barking and motorcycle sound. Noise, the sum of these noises is called background noise, background noise will affect the accuracy of the measurement. Usually the noise of a...

AI Technical Summary

Problems solved by technology

However, the substation in operation cannot be stopped just because of the measurement of its environmental noise, so the noise measured by a single sound level meter is the superposition of the substation's own noise and other environmental noise

Using a single sound level meter, it is difficult to distinguish the source, distribution, size, spectrum characteristics and other parameters of the internal noise of the substation, which is not conducive to the division of responsibilities for substation equipment noise, and brings inconvenience to the control of substation environmental noise

[0003] At present, the sound field distribution map in the substation can be obtained more accurately by using the volume array noise test device, but the array arm of the existing volume array test device is relatively large in size and cannot be retracted, so it is difficult to transport; The test operation is cumbersome and the efficiency is low; it must be disassembled and assembled every time it is used, which is easy to damage the components and the test cost is high; in addition, there are many low-frequency noises in the substation, the existing array test device is small in size, and the low-frequency noise The test is not accurate enough, and the larger size array test set is more dangerous to use in the substation

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