GB529332A - Apparatus for determining insulating values - Google Patents

Apparatus for determining insulating values

Info

Publication number
GB529332A
GB529332A GB1585439A GB1585439A GB529332A GB 529332 A GB529332 A GB 529332A GB 1585439 A GB1585439 A GB 1585439A GB 1585439 A GB1585439 A GB 1585439A GB 529332 A GB529332 A GB 529332A
Authority
GB
United Kingdom
Prior art keywords
transformer
resistance
secondary winding
shield
winding
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
GB1585439A
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.)
GLENN HAZZARD BROWNING
Original Assignee
GLENN HAZZARD BROWNING
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 GLENN HAZZARD BROWNING filed Critical GLENN HAZZARD BROWNING
Priority to GB1585439A priority Critical patent/GB529332A/en
Publication of GB529332A publication Critical patent/GB529332A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12Testing 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
    • G01R31/1227Testing 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
    • G01R31/1245Testing 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

529,332. Resistance and power-factor measurements. DOBLE, F. C., and BROWNING, G. H. May 30, 1939, No. 15854. [Class 37] Apparatus for measuring the insulation resistance and power factor of dielectrics such as bushings, operating rods, and oil in oil circuit breakers, bushings and windings of power and instrument transformers &c. is so arranged that the charging current and watts loss are measured from the input side, and that the same apparatus may be employed with test specimens taking a large range of charging current. As shown in Fig. 1 a variable inductance or resistance 3 is connected to an A.C. power source and supplies the primary winding P<1> of a step-up transformer T<1> through a reversing switch 4 by means of which the phase of the voltage may be varied by 180 degrees. The high-tension terminal of the secondary winding S<1> of the transformer T<1> is connected, through the primary winding P<2> of a transformer T<2>, a tapping switch 6, and a conductor 7, to one terminal of the insulation to be tested, represented by a capacitance Cx and resistance Rx. The secondary winding S2 of the transformer T2 is connected to an ammeter 10 and the current coil CC of a wattmeter, 11, and is also earthed. The tapping switch 6 enables the secondary current to be adjusted in accordance with the capacitance of the test specimen so that the same ammeter and wattmeter may be employed with test specimens of widely varying capacitances. A third transformer T3 has its primary winding P 3 connected across the high tension and its secondary winding S3 connected through a variable resistance 13 to the potential coil pc of the wattmeter 11, a condenser 14 being connected across the potential coil. A voltmeter 15 is connected across the secondary winding S3. Condensers 16, 17 may be connected across the primary and secondary windings P2, S2 of the transformer T2 in order to change the phase of the primary current in relation to the secondary voltage and to correct the phase of the current in the current coil of the wattmeter. A shield 18 surrounds the primary winding P<2> and is connected to the high potential terminal 19 and to a shield 20 surrounding the conductor 7. A shield 21 surrounds the secondary winding S2 and is connected to one terminal of the winding and to earth. An outer earthed shield 22 surrounds the shield 20. Earthed shields 23, 24, 25 surround the instruments 10, 11, 15 and the primary and secondary windings P3, S3 of the transformer T3.A neon tube 27 connected to the secondary winding S2 protects the instruments 10, 11 from damage due to excess voltages. Guard wires 29, 34, Fig. 2, connected to the shield 20, prevent surface leakage from affecting the instrument readings. Alternative measuring means shown in Fig. 2 comprise a resistance 36 connected across the secondary winding S2, a resistance 37 and variable condenser 38 connected in parallel across the secondary winding S3 and a mill detector instrument 39. The loss through the test specimen and its charging current can be calculated from the known relationships in phase and magnitude between the voltages across the resistances 36,37 and the test voltage, and the amounts of these resistances that are tapped off when a null indication is obtained. Induced currents in the conductor 7 due to adjacent currentcarrying conductors may be corrected for by taking two sets of readings with the phase of the test voltage varied 180 degrees by the reversing switch 4 and averaging these readings. U.S.A. Specification 1,945,263 is referred to.
GB1585439A 1939-05-30 1939-05-30 Apparatus for determining insulating values Expired GB529332A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1585439A GB529332A (en) 1939-05-30 1939-05-30 Apparatus for determining insulating values

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1585439A GB529332A (en) 1939-05-30 1939-05-30 Apparatus for determining insulating values

Publications (1)

Publication Number Publication Date
GB529332A true GB529332A (en) 1940-11-19

Family

ID=10066710

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1585439A Expired GB529332A (en) 1939-05-30 1939-05-30 Apparatus for determining insulating values

Country Status (1)

Country Link
GB (1) GB529332A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107576850A (en) * 2017-09-07 2018-01-12 国家电网公司江苏省电力公司扬州供电公司 Transformer Bushing Tap Insulation test distributed control device
CN109557373A (en) * 2018-12-30 2019-04-02 南瑞集团有限公司 A kind of high temperature and pressure lower volume resistivity test system
CN113075509A (en) * 2021-03-30 2021-07-06 中国大唐集团科学技术研究院有限公司中南电力试验研究院 Online monitoring device and monitoring method for insulation of water and electricity connector of bar of internal water cooling generator

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107576850A (en) * 2017-09-07 2018-01-12 国家电网公司江苏省电力公司扬州供电公司 Transformer Bushing Tap Insulation test distributed control device
CN107576850B (en) * 2017-09-07 2024-02-09 国网江苏省电力有限公司扬州供电分公司 Insulation test sub-control device for transformer bushing end screen
CN109557373A (en) * 2018-12-30 2019-04-02 南瑞集团有限公司 A kind of high temperature and pressure lower volume resistivity test system
CN109557373B (en) * 2018-12-30 2023-11-17 南瑞集团有限公司 Volume resistivity test system under high temperature and high pressure
CN113075509A (en) * 2021-03-30 2021-07-06 中国大唐集团科学技术研究院有限公司中南电力试验研究院 Online monitoring device and monitoring method for insulation of water and electricity connector of bar of internal water cooling generator
CN113075509B (en) * 2021-03-30 2024-03-15 中国大唐集团科学技术研究院有限公司中南电力试验研究院 Insulation on-line monitoring device and monitoring method for water-cooled generator bar water-electricity connector

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