CN2550768Y

CN2550768Y - Live line detector for high voltage transmission line insulator

Info

Publication number: CN2550768Y
Application number: CN 02240245
Authority: CN
Inventors: 程养春; 李成榕; 丁立健; 王景春
Original assignee: HUABEI ELECTRICL POWER UNIV (BEIJING)
Current assignee: HUABEI ELECTRICL POWER UNIV (BEIJING)
Priority date: 2002-06-13
Filing date: 2002-06-13
Publication date: 2003-05-14
Anticipated expiration: 2012-06-13

Abstract

The utility model provides a live line detector for high voltage transmission line insulators, and relates to a device for detecting the defects of a high voltage transmission line insulator, particularly a device capable of identifying the conductance defect of composite insulators and low and zero resistance insulators in a suspension insulator string. The utility model is composed of a bracket [1], an electric-field probe [10] and a circuit part [11], wherein the electric-field probe [10] inducts the space electric field around the insulator. The signals of the electric field pass through an amplifier [15], a rectifier [16] and a voltage-frequency converter [17], and are received by a microprocessor [18]. A locating circuit [14] detects the spatial position of the insulator and sends the detected signals into the microprocessor [18]. The microprocessor [18] compares the checked signals of the electric field with the signals of a standard electric field and displays the test result which is stored into a memory [19]. The utility model has the advantages of easy and simple operation, low work intensity, simple structure, small volume and low cost.

Description

The high-voltage transmission line insulator live detector

Technical field

The utility model relates to a kind of device of charged detection high-voltage transmission line insulator defective, especially can discern the conductive defect of composite insulator and the low zero resistance insulator in the suspension insulator string.

Background technology

The conventional means that detects the ultra-high-tension power transmission line composite insulator at present is that this method can not be seen insulator inherent vice and hidden defective with the binoculars range estimation; Detecting the low null value suspended insulator common tool of ultra-high-tension power transmission line is the spark fork, during detection with two metal contact of spark fork respectively with the iron pin and the chapeau de fer overlap joint of insulator, if insulator dielectric is functional, the voltage breakdown sparking distance that insulator is born, produce spark discharge, operating personnel judge according to the sound of spark discharge whether insulator is good, this method can not be worked under strong noise background, can not detect distance insulator far away, it is big to detect labour intensity piecewise, can produce danger by short circuit good insulation, can not be used to detect composite insulator.Extremely indivedual areas are detected insulator with infrared thermoviewer according to variation of temperature, but can not use down by strong by day background light, and cost is also expensive.Someone is modified into the spark fork can measure the instrument that insulator voltage distributes automatically, but the mechanical part complexity still has short circuit good insulation to produce dangerous possibility, can not be used to detect composite insulator.

The utility model content

Can not take into account the deficiency of aspects such as versatility, accuracy, simplicity, security and cost in order to overcome existing insulator detection means, the utility model provides a kind of high-voltage transmission line insulator detector, can detect composite insulator inherent vice and hidden defective, can detect low null value suspended insulator again, and can short circuit good insulation, not affected by noise, simplify the operation, alleviated labour intensity, cost is also cheap.

The principle of the utility model foundation is: when composite insulator contains when containing zero resistance insulator in conductive defect or the porcelain insulator string, Electric Field Distribution around it will distort, standard electric field distribution by with zero defect the time compares, and just can reach testing goal.The technical solution of the utility model is: form detecting instrument by carriage made from insulating material and the electric field measurement probe and the circuit part that are installed in its outside, space electric field around the electric field measurement probe induction insulator, and electric field signal delivered to circuit part, through the included amplifier of circuit part, rectifier, voltage-frequency converter, be transformed into the square-wave signal of frequency, receive and add up this signal by microprocessor with electric field change; Circuit part also comprises positioning circuit, and it surveys the locus of insulator, produces the insulator position signalling and sends into microprocessor; Microprocessor compares detected electric field signal and standard electric field signal, provides testing result, and deposits the memory that is attached thereto in.When composite insulator produces conductive defect, perhaps produce when hanging down zero resistance insulator in the suspension insulator string, no matter whether can find from outward appearance, electric field all can produce change around the insulator, therefore, the utility model can be used for the detection of composite insulator and suspended insulator simultaneously, can not miss hidden defective.The utility model directly is not electrically connected with insulator, therefore can not cause danger by the short circuit insulator.The utility model adopts the slip metering system, only needs during detection instrument is slipped over along insulator, needn't measure piecewise, thereby easy and simple to handle, labour intensity is little, and simple in structure, and volume is little, and the circuit that is adopted is the normal conventional circuit, thereby cost is low.

Description of drawings

Fig. 1, Fig. 2, Fig. 3 and Fig. 4 are respectively front view, left view, rear view and the vertical views of the utility model embodiment;

Fig. 5 is a circuit block diagram of the present utility model.

Embodiment

Referring to each accompanying drawing, the high-voltage transmission line insulator live detector is made up of carriage 1 and the electric field measurement probe 10, the circuit part 11 that are installed in its outside.

Carriage 1 global shape is the shape of a saddle, and its horizontal section and vertical cross-section are broken line type, and the radial and axial radian with insulator or insulator chain is complementary respectively; Middle side part outside it has the connection handle 2 of a level, is used to connect the insulating bar of being convenient to operate; In its underpart, a photodetection hole 7 is arranged.

Electric field measurement probe 10 is rectangular parallelepiped cans 4 of respectively having an added metal flat board 3 at upper bottom surface and bottom surface; Insulation between added metal dull and stereotyped 3 and the can 4; Can 4 built-in circuit parts 11; Electric field measurement probe 10 is installed on carriage 1 outside, metal plate 3 and carriage 1 axis normal.

Circuit part 11 comprises amplifier 15, rectifier 16, voltage-frequency converter 17, microprocessor 18 and positioning circuit 14, positioning circuit 14 adopts reflection light barrier, it is by the photodetection hole 7 of carriage 1 bottom, send detection insulator locus light beam by luminotron 5, accept folded light beam by photoelectric tube 6, the effective detection range of photoelectric tube 5,6 and the size of insulator radius are complementary, and are 4 centimetres.

When using the utility model, insulator surface is pressed close in carriage 1 inboard, electric field measurement probe 10 is put into insulator ground connection side end, along the insulator axis be close to insulator surface at the uniform velocity smooth sliding to the lead side end, electric field measurement probe 10 obtains the space electric field signal around the insulator, electric field signal is transformed into the square-wave signal of frequency with electric field change through amplifier 15, rectifier 16, voltage one frequency converter 17, and microprocessor 18 receives also adds up this signal; Positioning circuit 14 slips over insulator at electric field measurement probe 10, and photoelectric tube 5,6 produces positioning signal when detecting the outstanding outer of insulator and sends into microprocessor 18; Microprocessor 18 compares detected electric field signal and standard electric field signal, provides testing result, and deposits the memory 19 that is attached thereto in.

Claims

1. high-voltage transmission line insulator live detector, it is characterized in that: it is made up of carriage made from insulating material [1] and the electric field measurement probe [10] and the circuit part [11] that are installed in its outside, space electric field around electric field measurement probe [10] the induction insulator, and electric field signal delivered to circuit part [11], through the included amplifier [15] of circuit part [11], rectifier [16], voltage one frequency converter [17], be transformed into the square-wave signal of frequency, receive and add up this signal by microprocessor [18] with electric field change; Circuit part [11] also comprises a positioning circuit [14], and it surveys the locus of insulator, produces the insulator position signalling and sends into microprocessor [18]; Microprocessor [18] compares detected electric field signal and standard electric field signal, provides testing result, and deposits the memory [19] that is attached thereto in.

2. high-voltage transmission line insulator live detector according to claim 1, it is characterized in that: described carriage [1] global shape is the shape of a saddle, its horizontal section and vertical cross-section are broken line type, and the radial and axial radian with insulator or insulator chain is complementary respectively; Middle side part outside it has the connection handle [2] of a level, in its underpart, a photodetection hole [7] is arranged.

3. high-voltage transmission line insulator live detector according to claim 1 is characterized in that: described electric field measurement probe [10] is a rectangular parallelepiped can [4] of respectively having an added metal flat board [3] at upper bottom surface and bottom surface; Insulation between added metal flat board [3] and the can [4]; Adorn described circuit part [11] in the can [4]; Electric field measurement probe [10] is installed on carriage [1] outside, metal plate [3] and carriage [1] axis normal.

4. high-voltage transmission line insulator live detector according to claim 1, it is characterized in that: described positioning circuit adopts reflection light barrier, it is by the photodetection hole [7] of carriage [1] bottom, detection direction is pointed to carriage [1] inboard, send detection insulator locus light beam by luminotron [5], accept folded light beam by photoelectric tube [6], the effective detection range of photoelectric tube [5,6] is 4 centimetres.