CN210690726U - Cable partial discharge detection device - Google Patents

Abstract

A cable partial discharge detection device comprises a preposed resonant sensor, a data processing device and a state display device which are connected in sequence; the resonant sensor comprises an induction polar plate and an adjustable inductor which are sequentially connected, and the induction polar plate is attached to the surface of the cable; the induction polar plate and the adjustable inductor are respectively connected with the data processing device, the resonant frequency on the surface of the cable is collected through the induction polar plate and flows to the data processing device through the signal transmission line, and the data processing device converts the resonant frequency signal of the analog quantity into a digital quantity signal and displays the digital quantity signal through the display device. When the cable partial discharge detection device is used, the induction pole plate and a tested cable form a capacitor, the inductance value of the adjustable inductor is adjusted from large to small, the resonance frequency of the inductor and the resonance frequency of the capacitor are changed from small to large, components of different frequencies can be measured, and the power frequency information of 50Hz can be used as a synchronous signal of a partial discharge test. Thus, the acquisition and processing channel of the synchronous signal does not need to be additionally constructed.

Description

Cable partial discharge detection device

Technical Field

The utility model relates to a cable detects, discharges technical field, concretely relates to cable partial discharge detection device.

Background

The repair time of the high-voltage transmission cable after an accident is long, and the normal power supply is influenced. The cable is affected by the operating environment, etc., and may be gradually deteriorated in insulation due to the intrusion of impurities, usually manifested as partial discharge, which may cause insulation breakdown in severe cases. The partial discharge detection is carried out on the power cable by utilizing the operating voltage on the cable, so that the insulation defect can be found more timely and accurately.

At present, a high-frequency current method is widely adopted to detect partial discharge signals of the cable. The working mode is to detect the pulse current flowing through the cable grounding wire. This approach often employs high frequency current sensors. However, the high-frequency current sensor has no direct grounding wire for the cable, so that signals are difficult to obtain during protection grounding, the electrical signal data detected by the high-frequency current sensor is inaccurate, and potential safety hazards exist.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the high frequency current sensor among the prior art and not having the direct earth connection to the cable, hardly acquire the signal when leading to the protection ground connection for the inaccurate defect that brings of signal of telecommunication data that high frequency current sensor detected.

Therefore, the cable partial discharge detection device comprises a front resonant sensor, a data processing device and a state display device which are connected in sequence;

the resonant sensor comprises an induction polar plate and an adjustable inductor which are sequentially connected, and the induction polar plate is attached to the surface of the cable;

the induction polar plate and the adjustable inductor are respectively connected with the data processing device, the resonant frequency on the surface of the cable is collected through the induction polar plate and flows to the data processing device through the signal transmission line, and the data processing device converts the resonant frequency signal of the analog quantity into a digital quantity signal and displays the digital quantity signal through the display device.

Further, in the above-mentioned case,

the induction polar plate is a rectangular thin metal plate and has certain elasticity.

Further, in the above-mentioned case,

the adjustable inductor comprises a spiral coil and a sliding end;

the spiral coil is respectively connected with the induction pole plate and the sliding end, and the sliding end is connected with the data processing module.

Further, in the above-mentioned case,

the data processing module is any one or more of a processor, a controller, a PLC, an integrated circuit, an FPGA and a singlechip.

Further, in the above-mentioned case,

the state display device is any one or more of a display instrument, a display or a mobile terminal.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a partial discharge detection device can be fast accurate detect the partial discharge signal of cable, has solved high frequency current sensor and has not had direct earth connection to the cable, hardly acquires the problem of signal when leading to the protection ground connection, makes the utility model provides a partial discharge detection device's signal of telecommunication data is more accurate, has improved the security.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a cable partial discharge detection device.

11. An induction pole plate; 12. an adjustable inductance; 13. and a signal transmission line.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

A cable partial discharge detection device is shown in a schematic structural diagram of FIG. 1 and comprises a front resonant sensor, a data processing device and a state display device which are connected in sequence;

the resonant sensor comprises an induction polar plate and an adjustable inductor which are sequentially connected, and the induction polar plate is attached to the surface of the cable;

the induction polar plate and the adjustable inductor are respectively connected with the data processing device, the resonant frequency on the surface of the cable is collected through the induction polar plate and flows to the data processing device through the signal transmission line, and the data processing device converts the resonant frequency signal of the analog quantity into a digital quantity signal and displays the digital quantity signal through the display device.

The effect and principle of the technical scheme are as follows:

when the cable partial discharge detection device is used, the induction pole plate and a tested cable form a capacitor, the inductance value of the adjustable inductor is adjusted from large to small, the resonance frequency of the inductor and the resonance frequency of the capacitor are changed from small to large, components of different frequencies can be measured, and the power frequency information of 50Hz can be used as a synchronous signal of a partial discharge test. Thus, the acquisition and processing channel of the synchronous signal does not need to be additionally constructed.

In one embodiment, the sensing plate is a rectangular thin metal plate with certain elasticity. The copper sheet, which has dimensions of, for example, 30cm to 40cm in length and 12cm to 16cm in width, for example, 0.5mm in thickness, can be bent to some extent to lie against the cable surface.

In one embodiment, the adjustable inductor comprises a spiral coil and a slip end; the spiral coil is respectively connected with the induction pole plate and the sliding end, and the sliding end is connected with the data processing module. The spiral coil has a certain number of turns, one end of the spiral coil is fixed, and the other end of the spiral coil can be connected to the position of the spiral coil through the sliding end so as to change the size of the actual inductor.

In one embodiment, the data processing module is any one or more of a processor, a controller, a PLC, an integrated circuit, an FPGA, and a single chip microcomputer.

In one embodiment, the status display device is any one or more of a display meter, a display or a mobile terminal.

The utility model provides a cable partial discharge detection device when the installation, the cable surface is hugged closely to the response polar plate, with the stiff end electrical connection of adjustable inductance. Two ends of the adjustable inductor are connected with the input channel of the data processing module through signal transmission lines. The main function of the data processing module is A/D conversion and processing of signals, and recording the waveform of signals transmitted by the input channel.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims (5)

1. A cable partial discharge detection device is characterized by comprising a front resonant sensor, a data processing device and a state display device which are sequentially connected;

the resonant sensor comprises an induction polar plate and an adjustable inductor which are sequentially connected, and the induction polar plate is attached to the surface of the cable;

the induction polar plate and the adjustable inductor are respectively connected with the data processing device, the resonant frequency on the surface of the cable is collected through the induction polar plate and flows to the data processing device through the signal transmission line, and the data processing device converts the resonant frequency signal of the analog quantity into a digital quantity signal and displays the digital quantity signal through the display device.

2. The cable partial discharge detection apparatus of claim 1,

the induction polar plate is a rectangular thin metal plate and has elasticity.

3. The cable partial discharge detection apparatus of claim 1,

the adjustable inductor comprises a spiral coil and a sliding end;

the spiral coil is respectively connected with the induction pole plate and the sliding end, and the sliding end is connected with the data processing module.

4. The cable partial discharge detection apparatus of claim 1,

the data processing module is any one or more of a processor, a controller, a PLC, an integrated circuit, an FPGA and a singlechip.

5. The cable partial discharge detection apparatus of claim 1,

the state display device is any one or more of a display instrument, a display or a mobile terminal.

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