GB439661A - Method of testing voltage transformers - Google Patents

Method of testing voltage transformers

Info

Publication number
GB439661A
GB439661A GB37197/34A GB3719734A GB439661A GB 439661 A GB439661 A GB 439661A GB 37197/34 A GB37197/34 A GB 37197/34A GB 3719734 A GB3719734 A GB 3719734A GB 439661 A GB439661 A GB 439661A
Authority
GB
United Kingdom
Prior art keywords
transformer
voltage
resistance
mutual inductance
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
GB37197/34A
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.)
WALTER HOHLE
Original Assignee
WALTER HOHLE
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 WALTER HOHLE filed Critical WALTER HOHLE
Publication of GB439661A publication Critical patent/GB439661A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/02Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/28Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/42Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
    • H01F27/422Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils for instrument transformers
    • H01F27/425Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils for instrument transformers for voltage transformers
    • 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
    • G01R31/50Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/62Testing of transformers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Ac-Ac Conversion (AREA)

Abstract

439,661. Inductance and phase-difference measurements. HOHLE, W., 13, Fraunhoferstrasse, Charlottenburg, Berlin. Dec. 28, 1934, No. 37197. Convention date, Dec. 30, 1933. [Class 37] The ratio and angle errors of a voltage transformer are measured by connecting the primary winding in parallel with the primary winding of a standard voltage transformer of the same transformation ratio, connecting the secondary windings in opposition, and compensating the difference between the secondary voltages, or a fraction thereof, by a zero method employing two regulable voltages in quadrature. As shown, the primary windings of the standard transformer N and the transformer X to be tested are connected in parallel and supplied from an alternating current source, the secondary windings being connected through the primary winding of a transformer HT so that their voltages oppose one another. In series with the secondary winding of the transformer HT is a zero instrument, such as a vibration galvanometer VG, the secondary winding of a regulable mutual inductance m and part of a slide-wire resistance s. The primary winding of the mutual inductance m is connected, in series with the slide wire resistance s and a resistance RV, across the secondary winding of the standard transformer N. A condenser C connected across the resistance RV causes a displacement in phase between the voltage at the slide wire and the secondary voltage. The mutual inductance and the slider are adjusted until the instrument VG gives zero indication, under which conditions the resistance tapped off from the slide wire is a measure of the ratio error, and the value of the mutual inductance is a measure of the angle error. A series resistance may be included in the primary circuit of the transformer HT, in which case the secondary voltage of this transformer is practically in quadrature with the difference voltage. The resistance tapped off from the slide wire then measures the angle error and the mutual inductance measures the ratio error. In a modification the circuit comprising the primary winding of the mutual inductance m and the resistances s, RV is connected across the secondary winding of an auxiliary transformer, of which the primary winding is connected across the secondary winding of the standard transformer N. In another modification the slide wire and the primary winding of the mutual inductance are fed from the secondary winding of a current transformer, the primary winding of which is connected in series with the resistance RV across the secondary winding of the standard transformer N. Instead of compensating the whole of the difference voltage, a portion may be tapped off from a voltage divider. In all cases the secondary coils of the mutual inductances carry no current when compensation is effected, so that their resistance and inductance do not enter into the measurement. The mutual inductance m may comprise air coils, of which the mutual inductance is varied by adjusting their relative position. Fixed mutual inductances with a secondary voltage division may be employed. Other means for supplying a variable voltage in quadrature to a circuit current or voltage may be employed, for example iron-cored transformers, to the secondary winding of which a circuit consisting of resistances and condensers is connected, this circuit including a variable resistance from which a variable voltage is derived.
GB37197/34A 1933-07-29 1934-12-28 Method of testing voltage transformers Expired GB439661A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEH136984D DE615752C (en) 1933-07-29 1933-07-29 Method for testing current transformers with the aid of a standard transformer with the same transmission ratio using a differential circuit
DEH138519D DE634507C (en) 1933-07-29 1933-12-31 Extension of the method for testing current fluctuations according to patent 615752 to the testing of voltage converters with the help of a standard converter

Publications (1)

Publication Number Publication Date
GB439661A true GB439661A (en) 1935-12-11

Family

ID=34066201

Family Applications (2)

Application Number Title Priority Date Filing Date
GB22038/34A Expired GB424810A (en) 1933-07-29 1934-07-27 Method of testing current transformers
GB37197/34A Expired GB439661A (en) 1933-07-29 1934-12-28 Method of testing voltage transformers

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB22038/34A Expired GB424810A (en) 1933-07-29 1934-07-27 Method of testing current transformers

Country Status (4)

Country Link
AT (3) AT141447B (en)
CH (3) CH176677A (en)
DE (2) DE615752C (en)
GB (2) GB424810A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2896156A (en) * 1956-05-04 1959-07-21 Superior Electric Co Transformer test circuit
CN111948593A (en) * 2020-07-27 2020-11-17 国网浙江省电力有限公司营销服务中心 Current transformer exciting current measuring method

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1028221B (en) * 1954-06-21 1958-04-17 Hartmann & Braun Ag Current transformer measuring device based on the principle of voltage compensation from Schering-Alberti
DE1038187B (en) * 1954-06-29 1958-09-04 Hartmann & Braun Ag Current transformer measuring device based on the principle of voltage compensation from Schering-Alberti
DE1027785B (en) * 1954-07-31 1958-04-10 Hartmann & Braun Ag Device for measuring the translation and angle error of current and voltage transformers
DE976857C (en) * 1955-04-20 1964-06-18 Licentia Gmbh Circuit arrangement for measuring the error sizes of current and voltage transformers
AT389397B (en) * 1980-11-28 1989-11-27 Moser Glaser & Co Ag ERROR COMPENSATED VOLTAGE CONVERTER FOR HIGH VOLTAGE
CN103293507B (en) * 2012-03-02 2016-08-31 北京瑞恒超高压电器研究所(普通合伙) The online test method of current transformer error
CN103267958B (en) * 2013-04-27 2016-01-20 广东电网公司电力科学研究院 The circuit of measuring voltage transformer voltage coefficient and method
CN104155625B (en) * 2014-07-31 2016-04-20 国家电网公司 For the servicing unit of current mutual inductor with high transforming ratio field-checking in GIS
CN105044408B (en) * 2015-06-30 2017-12-19 国家电网公司 A kind of extra-high voltage detecting current transformer flows up device with high current
CN106226638A (en) * 2016-08-26 2016-12-14 四川和中电力科技有限公司 A kind of low voltage mutual inductor measurement loop state on_line monitoring system
CN107192974B (en) * 2017-07-19 2023-06-09 云南电网有限责任公司电力科学研究院 Integrated voltage and current standard transformer
CN109407034B (en) * 2018-12-12 2023-09-08 云南电网有限责任公司昆明供电局 Primary and secondary synchronous wiring device of large-current transformer
CN109975736B (en) * 2019-01-15 2024-02-06 红相股份有限公司 Mutual inductor error testing system in GIS based on frequency conversion anti-interference technology
CN111693925B (en) * 2020-07-20 2023-01-03 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 Current transformer detection operation platform and multi-position top-speed current transformer calibration system
CN112068062B (en) * 2020-09-10 2023-01-03 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 Mutual inductor calibration system and calibration method
CN114814706B (en) * 2022-06-23 2022-11-04 武汉磐电科技股份有限公司 Testing device and method for online self-calibration of mutual inductor
CN116338556B (en) * 2023-05-26 2023-09-15 上海置信电气有限公司 Error tracing device and method for wide-range standard current transformer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2896156A (en) * 1956-05-04 1959-07-21 Superior Electric Co Transformer test circuit
CN111948593A (en) * 2020-07-27 2020-11-17 国网浙江省电力有限公司营销服务中心 Current transformer exciting current measuring method
CN111948593B (en) * 2020-07-27 2023-07-28 国网浙江省电力有限公司营销服务中心 Exciting current measuring method for current transformer

Also Published As

Publication number Publication date
GB424810A (en) 1935-02-28
AT142842B (en) 1935-09-25
AT144602B (en) 1936-02-10
DE634507C (en) 1936-08-28
CH181579A (en) 1935-12-31
CH176982A (en) 1935-05-15
DE615752C (en) 1935-07-12
AT141447B (en) 1935-04-25
CH176677A (en) 1935-04-30

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