CN208350926U - A kind of high-tension cable defect quick diagnosis device - Google Patents

Abstract

The utility model discloses a high-voltage cable defect rapid diagnosis device. The high-voltage cable defect rapid diagnosis device is used to detect whether a high-voltage cable has defects. The high-voltage cable comprises a metal wire core, a shielding shield and a high-voltage cable joint. The shield is sleeved on the outside of the metal wire core, and the shielding shield is grounded, and the cable joint is arranged on the outer side of the shielding shield and is used for connecting two adjacent cables. The cable defect rapid diagnosis device includes a transformer K, a UHF electromagnetic wave detector, an amplifier, a filter, an analog-to-digital converter and an industrial computer. The transformer K is connected to a power frequency voltage, and after the power frequency voltage is boosted, When the high-voltage cable is loaded on the metal wire core, when the high-voltage cable has defects, ultra-high frequency electromagnetic waves are generated at the defect of the high-voltage cable.

Description

A kind of high-tension cable defect quick diagnosis device

Technical field

The utility model relates to electron electric power equipment technical field, specifically a kind of high-tension cable defect rapid diagnostic device It sets.

Background technique

With the fast development of electric power network technique, twisted polyethylene cable (abbreviation XLPE) has good electrical property and hot Can, and structure is simple, and the manufacturing cycle is short, and work tolerable temperature is high, and oil-free, laying is convenient, and power supply safety is reliable, is conducive to beauty Change city, thus is widely used in each voltage class of electric system.But the insulation knot of twisted polyethylene cable In structure often due in processing technology difficulty or raw material are impure and there are air gap and harmfulness impurity, or due to technique Reason between insulation and semiconductive shielding layer there are gap or semiconductor are prominent to insulating layer, in these air gaps and impurity point Shelf depreciation is easily generated at end, while may also can be generated various insulation in the installation and operation process of power cable and be lacked Falling into leads to shelf depreciation.Shelf depreciation is the sign of cable insulation deterioration, and causes the one of the major reasons of insulation degradation, office Portion's electric discharge is the running biggish security risk of power cable, if shelf depreciation development will cause to a certain extent Insulation breakdown and cause power grid accident.Therefore, carrying out Partial Discharge Detection and Position Research to power cable and its connector has Important meaning and economic value.

It mainly include at present high frequency partial discharge examination method, superelevation applied to the detection method for local discharge of cable run Frequently, supercritical ultrasonics technology, damp oscillatory wave (OWTS) method etc..High frequency partial discharge examination method core component is this baseline ring of Kenneth Rogoff Current sensor (abbreviation Rogowski coil), Rogowski coil is from coupling from the ground line or cross interconnected line of cable connector and cable termination Close high-frequency impulse, the detection method can charge carry out Partial Discharge Detection, it is easy to carry, operation it is convenient, but need to electricity The each cable connector in cable road, terminal are detected, and long cable circuit are detected more time-consuming, laborious.

Utility model content

The purpose of this utility model is to provide a kind of high-tension cable defect quick diagnosis devices, to solve in background technique The problem of proposition.To achieve the above object, the utility model provides the following technical solutions；

A kind of high-tension cable defect quick diagnosis device, the high-tension cable defect quick diagnosis device are high for detecting one Whether voltage cable generates defect, and the high-tension cable includes metal core, shielding shield and high-voltage cable joint, shields shield set It connects outside the metal core, also, the shielding shield is grounded, the cable connector is set to the outer of the shielding shield Side, for connecting two adjacent cables, the high-tension cable defect quick diagnosis device includes transformer K, superfrequency Electromagnetic wave detector, amplifier, filter, analog-digital converter and industrial personal computer, the transformer K are connect with a power-frequency voltage, will After the power-frequency voltage boosting, it is loaded on the metal core, when the high-tension cable has defect, the high-tension cable Fault location generate extra-high frequency electromagnetic waves；

The superfrequency electromagnetic wave detector includes metal base plate, dielectric-slab, rectangular metal patch and coaxial probe, described Dielectric-slab covers the metal base plate, and the rectangular metal patch is pasted on the dielectric-slab, the extra-high frequency electromagnetic waves inspection It surveys device and the extra-high frequency electromagnetic waves is received by the gap between the rectangular metal patch and the metal base plate, and be converted into The electric current of high frequency, the coaxial probe are fed as feeder line, and be will test signal and be transmitted to the amplifier, the amplification Device is transmitted to the filter after amplifying the detection signal, after the filter is filtered the detection signal The industrial personal computer is transmitted to be handled.

Preferably, the bandwidth of the extra-high frequency electromagnetic waves is between 300MHZ-1.5GHZ.

Preferably, the filter is high-pass filter, and the high-pass filter is for filtering out in the detection signal Low-frequency component.

Preferably, the superfrequency electromagnetic wave detector can be installed by external method or built-in method is installed.

Preferably, the industrial personal computer also has in display screen interface, operation interface, oscillograph interface and alarm device interface It is at least one.

Preferably, the transformer K includes iron core winding device, first resistor R1, second resistance R2, first capacitor C1 and The input terminal of two capacitor C2, the iron core winding device are connect by the first resistor R1 with the power-frequency voltage, the iron core By the work after boosting after the output end of winding device is in parallel with the second resistance R2 and first capacitor C1 and the second capacitor C2 Frequency boost in voltage is loaded on the metal core 13.

Compared with prior art, the utility model has the beneficial effects that the utility model is simple and reasonable, testing result It is genuine and believable, it is portable high, there is engineering significance, compared with prior art, there is scene detection efficiency and detection essence The advantages that high is spent, the live testing for being conducive to optimization, promoting cable, it is ensured that the safe and reliable operation of cable can adapt to difference The cable requirement of diameter, can quickly find conducting wire aging position in cable, be conducive to be directed in the case where not destroying cable Cable aging is replaced, and reduces cable cost, and data collection capacity is big, the requirement to environment is small.

Detailed description of the invention

Fig. 1 is a kind of structural schematic diagram of high-tension cable defect quick diagnosis device provided by the utility model；

Fig. 2 is the knot of the superfrequency electromagnetic wave detector of high-tension cable defect quick diagnosis device provided by the utility model Structure schematic diagram；

Wherein, high-tension cable 1, shielding shield 2, high-voltage cable joint 3, superfrequency electromagnetic wave detector 4, amplifier 5, filter Wave device 6, analog-digital converter 7, industrial personal computer 8, metal base plate 9, dielectric-slab 10, rectangular metal patch 11, coaxial probe 12, metal wire Core 13.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical aspect in the utility model embodiment Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work Every other embodiment obtained, fall within the protection scope of the utility model.

Fig. 1-Fig. 2 is please referred to, a kind of embodiment provided by the utility model:

A kind of high-tension cable defect quick diagnosis device, the high-tension cable defect quick diagnosis device are high for detecting one Whether voltage cable 1 generates defect, and the high-tension cable 1 includes metal core 13, shielding shield 2 and high-voltage cable joint 3, shielding Shield 2 is socketed in outside the metal core 13, also, the shielding shield 2 is grounded, and the cable connector 3 is set to the screen The outside for covering shield 2, for connecting two adjacent cables, the high-tension cable defect quick diagnosis device includes transformation Device K, superfrequency electromagnetic wave detector 4, amplifier 5, filter 6, analog-digital converter 7 and industrial personal computer 8, the transformer K and one Power-frequency voltage connection is loaded on the metal core 13, after power-frequency voltage boosting when the high-tension cable 1 has When defect, the fault location of the high-tension cable 1 generates extra-high frequency electromagnetic waves；

The superfrequency electromagnetic wave detector 4 includes metal base plate 9, dielectric-slab 10, rectangular metal patch 11 and coaxial spy Needle 12, the dielectric-slab 10 cover the metal base plate 9, and the rectangular metal patch 11 is pasted on the dielectric-slab 10, institute Superfrequency electromagnetic wave detector 4 is stated to pass through described in the gap reception between the rectangular metal patch 11 and the metal base plate 9 Extra-high frequency electromagnetic waves, and it is converted into the electric current of high frequency, the coaxial probe 12 is fed as feeder line, and will test signal biography The amplifier 5 is transported to, the amplifier 5 is transmitted to the filter 6, the filtering after amplifying the detection signal Device 6 is transmitted to the industrial personal computer 8 after being filtered to the detection signal and handles.

In the present embodiment, the bandwidth of the extra-high frequency electromagnetic waves is between 300MHZ-1.5GHZ, and the interference at scene is usual In 300MHZ hereinafter, influencing especially small.

In the present embodiment, the filter 6 is high-pass filter, and the high-pass filter is for filtering out the detection signal In low-frequency component, prevent low frequency noises testing result.

In the present embodiment, the superfrequency electromagnetic wave detector 4 can be installed by external method or the installation of built-in method, external Method simple installation, built-in method sensitivity are more excellent.

In the present embodiment, the industrial personal computer 8 also there is display screen interface, operation interface, oscillograph interface and alarm device to connect At least one of mouthful, the result output that will be tested.

In the present embodiment, the transformer K includes iron core winding device, first resistor R1, second resistance R2, first capacitor C1 And the second capacitor C2, the input terminal of the iron core winding device is connect by the first resistor R1 with the power-frequency voltage, described After boosting after the output end of iron core winding device is in parallel with the second resistance R2 and first capacitor C1 and the second capacitor C2 Power-frequency voltage boosting be loaded on the metal core 13, meet the needs of boosting, prevent the interference of high current.

Working principle: when the high-tension cable 1 has defect, the making alive on the high-tension cable 1, the high-tension cable 1 fault location can generate extra-high frequency electromagnetic waves, using the superfrequency electromagnetic wave detector 4 rectangular metal patch 11 with it is described Gap between metal base plate 9 receives the extra-high frequency electromagnetic waves, and is converted into the electric current of high frequency, 12 conduct of coaxial probe Feeder line is fed, and be will test signal and be transmitted to the amplifier 5, and the amplifier 5 amplifies the detection signal After be transmitted to the filter 6, the filter 6 is transmitted to the industrial personal computer 8 and carries out after being filtered to the detection signal Processing handles the detection signal by the industrial personal computer 8, and whether the available high-tension cable 1 has defect and defect Position.

Although the utility model is described in detail with reference to the foregoing embodiments, come for those skilled in the art Say, it is still possible to modify the technical solutions described in the foregoing embodiments, or to part of technical characteristic into Row equivalent replacement, within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on should all It is included within the scope of protection of this utility model.

Claims (6)

1. A high-voltage cable defect rapid diagnosis device, characterized in that: the high-voltage cable defect rapid diagnosis device is used to detect whether a high-voltage cable (1) has a defect, and the high-voltage cable (1) comprises a metal wire core (13) , a shielding cover (2) and a high-voltage cable joint (3), the shielding cover (2) is sleeved outside the metal wire core (13), and the shielding cover (2) is grounded, and the cable joint (3) It is arranged on the outer side of the shielding shield (2) and is used for connecting two adjacent cables. The high-voltage cable defect rapid diagnosis device includes a transformer K, an ultra-high frequency electromagnetic wave detector (4), Amplifier (5), filter (6), analog-to-digital converter (7) and industrial computer (8), the transformer K is connected with a power frequency voltage, after boosting the power frequency voltage, it is loaded into the On the metal wire core (13), when the high-voltage cable (1) has a defect, a UHF electromagnetic wave is generated at the defect of the high-voltage cable (1); The UHF electromagnetic wave detector (4) includes a metal base plate (9), a dielectric plate (10), a rectangular metal patch (11) and a coaxial probe (12), and the dielectric plate (10) covers the A metal base plate (9), the rectangular metal patch (11) is pasted on the dielectric plate (10), and the UHF electromagnetic wave detector (4) communicates with the rectangular metal patch (11) through the rectangular metal patch (11). The gap between the metal base plates (9) receives the UHF electromagnetic wave and converts it into a high-frequency current, and the coaxial probe (12) is used as a feeder for feeding, and the detection signal is transmitted to the amplifier ( 5), the amplifier (5) amplifies the detection signal and transmits it to the filter (6), and the filter (6) filters the detection signal and transmits it to the industrial computer (8). ) to be processed. 2 . The device for rapid diagnosis of high-voltage cable defects according to claim 1 , wherein the bandwidth of the UHF electromagnetic wave is between 300MHZ and 1.5GHZ. 3 . 3 . The device for rapid diagnosis of high-voltage cable defects according to claim 2 , wherein the filter (6) is a high-pass filter, and the high-pass filter is used to filter out low-frequency components in the detection signal. 4 . . 4 . The device for rapid diagnosis of high-voltage cable defects according to claim 3 , wherein the UHF electromagnetic wave detector ( 4 ) can be installed by an external method or a built-in method. 5 . 5 . The device for rapid diagnosis of high-voltage cable defects according to claim 4 , wherein the industrial computer ( 8 ) further has at least one of a display interface, an operation interface, an oscilloscope interface and an alarm interface. 6 . 6 . The device for rapid diagnosis of high-voltage cable defects according to claim 5 , wherein the transformer K comprises an iron core winding device, a first resistor R1 , a second resistor R2 , a first capacitor C1 and a second capacitor 6 . C2, the input end of the iron core winding device is connected to the power frequency voltage through the first resistor R1, and the output end of the iron core winding device is connected to the second resistor R2 and the first capacitor C1 and After the second capacitor C2 is connected in parallel, the boosted power frequency voltage is boosted and loaded onto the metal wire core (13).