GB994527A - Improvements relating to testing apparatus for electrical insulation - Google Patents

Improvements relating to testing apparatus for electrical insulation

Info

Publication number
GB994527A
GB994527A GB8362/63A GB836263A GB994527A GB 994527 A GB994527 A GB 994527A GB 8362/63 A GB8362/63 A GB 8362/63A GB 836263 A GB836263 A GB 836263A GB 994527 A GB994527 A GB 994527A
Authority
GB
United Kingdom
Prior art keywords
electrode
sphere
void
capacitance
electrodes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB8362/63A
Inventor
Evan Arthur Pritchard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Associated Electrical Industries Ltd
Original Assignee
Associated Electrical Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Associated Electrical Industries Ltd filed Critical Associated Electrical Industries Ltd
Priority to GB8362/63A priority Critical patent/GB994527A/en
Publication of GB994527A publication Critical patent/GB994527A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
    • G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G01R31/1245—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

994, 527. Calibration. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. Feb. 26, 1964 [March 1, 1963], No. 8362/63. Heading G1U. [Also in Division H1] Testing apparatus for simulating the conditions arising across a cavity in insulation under test comprises three aligned electrodes, the spacing between the second and third electrodes being adjustable to represent the cavity, means for applying a high tension voltage across the first and third electrodes, and a capacitor coupling to the second electrode whereby the voltage developed across the second and third electrodes can be measured. It is stated that the equivalent circuit of a slab of insulation containing a void is a capacitor in parallel with two capacitors in series, the latter corresponding to the capacitance of the void and the capacitance of the walls of the void to electrodes in contact with the slab. Fig. 3 shows apparatus forming the equivalent circuit and adapted to calibrate a discharge detector for testing insulation. The main capacitor comprises a cylinder 2 and a rod 1, and the two capacitors in series are formed by a metal sphere 4 and a washer 9 and by metal spheres 5 and 6. The capacitance between spheres 5 and 6 represents the capacitance of the void, and the axial position of sphere 6 is adjustable by a screw 12. A loop of insulated wire encircles the sphere 5 and forms the input capacitor to a high impedance voltmeter (not shown). Mica windows may be fitted in the electrode 2 so that the void equivalent gap is irradiated by any incident ultra-violet radiation, and a hole may be provided in the electrode to allow a screened probe to be brought into contact with the sphere 5 to measure its capacitance under different gap settings and different voltages applied to electrode 2. For calibrating a discharge detector, the electrode 1 is connected to a high voltage supply and electrode 2 is earthed. Measurements are made of the voltage across the gap at the extinction voltage, and it is shown how these measurements together with the known capacitances can be used to calibrate a discharge detector. The apparatus shown in Fig. 3 may be used up to slightly less than 10 KV; for higher voltages the washer 9 is replaced by a hemisphere and the space between it and the sphere 4 is filled with insulating oil, Fig. 4 (not shown). In this arrangement the sphere 4 may be adjustable axially.
GB8362/63A 1963-03-01 1963-03-01 Improvements relating to testing apparatus for electrical insulation Expired GB994527A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8362/63A GB994527A (en) 1963-03-01 1963-03-01 Improvements relating to testing apparatus for electrical insulation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8362/63A GB994527A (en) 1963-03-01 1963-03-01 Improvements relating to testing apparatus for electrical insulation

Publications (1)

Publication Number Publication Date
GB994527A true GB994527A (en) 1965-06-10

Family

ID=9851077

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8362/63A Expired GB994527A (en) 1963-03-01 1963-03-01 Improvements relating to testing apparatus for electrical insulation

Country Status (1)

Country Link
GB (1) GB994527A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4470007A (en) * 1981-04-01 1984-09-04 Baur Pruf - und Messtechnik KG Apparatus for testing the electrical breakdown resistance potential of insulating media and/or cooling media
CN109541019A (en) * 2018-12-21 2019-03-29 中国科学院电工研究所 Dielectric breakdown strength experimental provision under a kind of low temperature, hyperbaric environment
CN113937487A (en) * 2021-08-30 2022-01-14 西北核技术研究所 Bounded wave antenna initial section for generating fast front edge radiation field

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4470007A (en) * 1981-04-01 1984-09-04 Baur Pruf - und Messtechnik KG Apparatus for testing the electrical breakdown resistance potential of insulating media and/or cooling media
CN109541019A (en) * 2018-12-21 2019-03-29 中国科学院电工研究所 Dielectric breakdown strength experimental provision under a kind of low temperature, hyperbaric environment
CN113937487A (en) * 2021-08-30 2022-01-14 西北核技术研究所 Bounded wave antenna initial section for generating fast front edge radiation field

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