CN202285038U - Ultrasonic array sensor for partial discharge detection - Google Patents

Abstract

An ultrasonic array sensor suitable for partial discharge detection belongs to the technical field of detection and is used for monitoring and locating partial discharge of electrical equipment. The technical solution is: the sensor consists of a stainless steel shell and multiple piezoelectric array elements installed in the stainless steel shell, the multiple piezoelectric array elements are arranged in a cross shape, and their signal receiving ends face the stainless steel shell. The signal receiving port and the signal output end of the piezoelectric array element are connected to the signal acquisition device through the array element lead wire. The piezoelectric array elements of the utility model are arranged in a cross shape, which can simultaneously measure the direction angle and pitch angle of the partial discharge ultrasonic signal, but the number of array elements is significantly less than that of the rectangular planar array sensor, thus ensuring the positioning success rate At the same time as positioning accuracy, the structure of the detection system is greatly simplified, and the cost of the detection system is reduced.

Description

An Ultrasonic Array Sensor Suitable for Partial Discharge Detection

technical field

The utility model relates to a sensor for detecting ultrasonic signals generated by partial discharge of electrical equipment, which belongs to the technical field of detection.

Background technique

Ultrasonic phased array sensors are commonly used sensors for partial discharge detection. There are two main types of ultrasonic phased array sensors, one is a linear array sensor, and the other is a rectangular planar array sensor.

The linear array sensor has "axis" symmetry, and space ambiguity will appear during positioning. At the same time, the linear array sensor can only measure direction in one coordinate direction, and cannot obtain the direction angle and pitch angle of the partial discharge ultrasonic signal at the same time, and the positioning success rate And the positioning accuracy is not high.

The rectangular planar array sensor can scan the entire planar space and obtain the direction angle and pitch angle of the partial discharge ultrasonic signal at the same time. However, due to the large number of elements in the rectangular planar array sensor and the large array redundancy, the detection system Complicated and expensive.

Therefore, it is necessary to improve the structure of the traditional ultrasonic phased array sensor.

Utility model content

The purpose of the utility model is to provide an ultrasonic array sensor suitable for partial discharge detection, which can simplify the structure of the sensor and reduce the manufacturing cost of the sensor while ensuring the positioning accuracy of the partial discharge.

Problem described in the utility model is realized with following technical scheme:

An ultrasonic array sensor suitable for partial discharge detection, consisting of a stainless steel shell and multiple piezoelectric array elements installed in the stainless steel shell, the multiple piezoelectric array elements are arranged in a cross shape, and their signal receiving ends Facing the signal receiving port of the stainless steel shell, the signal output end of the piezoelectric array element is connected to the signal acquisition device through the array element lead.

In the above ultrasonic array sensor suitable for partial discharge detection, the signal receiving port of the stainless steel housing is provided with a stainless steel protective film, and a silicone rubber filler is provided between the stainless steel housing and the piezoelectric array element.

In the above-mentioned ultrasonic array sensor suitable for partial discharge detection, an acoustic damping block is arranged between the piezoelectric array element and the lead wire of the array element.

In the above-mentioned ultrasonic array sensor suitable for partial discharge detection, nine piezoelectric array elements are provided.

The piezoelectric array elements of the utility model are arranged in a cross shape, which can measure the direction angle and pitch angle of the partial discharge ultrasonic signal at the same time, but the number of array elements is significantly less than that of the rectangular planar array sensor, thus ensuring the positioning success rate At the same time as positioning accuracy, the structure of the detection system is greatly simplified, and the cost of the detection system is reduced.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described.

Fig. 1 is a schematic cross-sectional view of the utility model;

Fig. 2 is a schematic longitudinal section of the utility model.

The labels in the figure are: 1. Cable; 2. Compression nut; 3. Stainless steel cover; 4. Array element lead; 5. Mouth ring; 6. Acoustic damping block; 7. Piezoelectric array element; 8. Stainless steel shell Body; 9. Silicone rubber filler; 10. Stainless steel protective film.

Detailed ways

Referring to Fig. 1 and Fig. 2, the utility model is mainly composed of a stainless steel shell 8 and nine piezoelectric array elements 7 arranged inside the stainless steel shell 8, and silicon is arranged between the stainless steel shell 8 and the piezoelectric array elements 7. The rubber filler 9 and nine piezoelectric array elements 7 are arranged in a cross shape, and are connected to the cable 1 through the array element leads 4 , and a stainless steel sheath 10 is provided at the signal receiving port of the stainless steel shell 8 . The distance between the centers of adjacent piezoelectric array elements 7 is 6mm, which corresponds to the half-wavelength of common PD ultrasonic signals. The cross section of each piezoelectric array element 7 is a circular surface with a radius of 2mm and an array element thickness of 14mm.

The ultrasonic array sensor can be directly placed on the outer wall of electrical equipment after adding magnetic media, and connected to a high-speed data synchronous acquisition device through a cable, which can obtain excellent partial discharge ultrasonic signals and form an array model. Positioning lays a good foundation.

Claims (4)

1. An ultrasonic array sensor suitable for partial discharge detection, characterized in that it includes a stainless steel housing (8) and multiple piezoelectric array elements (7) installed in the stainless steel housing (8), the multiple The piezoelectric array elements (7) are arranged in a cross shape, and their signal receiving ends face the signal receiving port of the stainless steel shell (8), and the signal output ends of the piezoelectric array elements (7) are connected to the signal through the array element lead wire (4). acquisition device. 2. The ultrasonic array sensor suitable for partial discharge detection according to claim 1, characterized in that, the signal receiving port of the stainless steel housing (8) is provided with a stainless steel protective film (10), and the stainless steel housing (8) A silicone rubber filler (9) is arranged between the piezoelectric array element (7). 3. The ultrasonic array sensor suitable for partial discharge detection according to claim 1 or 2, characterized in that an acoustic damping block (6) is arranged between the piezoelectric array element (7) and the array element lead (4). 4. The ultrasonic array sensor suitable for partial discharge detection according to claim 3, characterized in that there are nine piezoelectric array elements (7).

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