GB692659A - Improvements relating to electrical testing apparatus - Google Patents

Improvements relating to electrical testing apparatus

Info

Publication number
GB692659A
GB692659A GB611651A GB611651A GB692659A GB 692659 A GB692659 A GB 692659A GB 611651 A GB611651 A GB 611651A GB 611651 A GB611651 A GB 611651A GB 692659 A GB692659 A GB 692659A
Authority
GB
United Kingdom
Prior art keywords
coil
circuit
detector
coils
meter
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
GB611651A
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.)
Electrical & Auto Products 193
GEORGE ALLEN ROTHWELL
Original Assignee
Electrical & Auto Products 193
GEORGE ALLEN ROTHWELL
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 Electrical & Auto Products 193, GEORGE ALLEN ROTHWELL filed Critical Electrical & Auto Products 193
Priority to GB611651A priority Critical patent/GB692659A/en
Publication of GB692659A publication Critical patent/GB692659A/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
    • G01R31/34Testing dynamo-electric machines
    • G01R31/346Testing of armature or field windings

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

692,659. Detecting faults. ELECTRICAL & AUTO PRODUCTS (1931), Ltd., and ROTHWELL, G. A. March 14, 1952 [March 14, 1951], No. 6116/51. Class 37. Means for testing armature, field coil, and stator windings comprises a search head containing a driver coil and a detector coil adapted to be moved over the surface of the article being tested, an oscillator coupled to the driver coil, and an amplifier having the detector coil in its input circuit and a meter or indicator in its output circuit, a signal being transmitted from the driver coil to the detector coil when the search head is placed near a closed winding. The search head 1, Fig. 1, includes an ironcored driver coil 2 and an iron-cored detector coil 3. An oscillator valve 4 is coupled to an output valve 5 which has in its anode circuit a transformer 6 feeding the driver coil 2. A variable resistance 7 in the grid circuit of the valve 4 is set to give a frequency of approximately 1 kc. The valve 4 is a twin triode connected as a two-stage resistance capacity coupled amplifier with the whole of the output fed back to the input, forming a multi-vibrator circuit which is resistance-capacity coupled to the output stage. The detector coil 3 is connected to the anode of a shunt-fed diode 9 coupled to a triode amplifier 10. A meter 11 is connected in the anode circuit of the amplifier 10 in a bridge circuit, which is balanced in the absence of an input signal by a resistance 12. When a signal is applied to the diode 9 the grid of the triode 10 is driven negative, the bridge becomes unbalanced, and the meter pointer is deflected. The sensitivity is controlled by a variable resistance 13. A relay 14 is provided in the anode circuit of the triode 10, with normally closed contacts across the meter terminals, so that the meter is short-circuited until the triode becomes conductive. Fig. 2 shows a search head for testing field coils. There are two driven coils 2 in series and two detector coils 3 in series. The detector coils 3 are mounted on the outer limbs 15 of a laminated iron core, the driver coils 2 being mounted on a cross-piece on the centre limb 16. A field coil to be tested is placed over one of the projecting ends of the limbs 15 and causes coupling between the coils 2, 3 if there is a shortcircuit in the winding. A signal is thereby transmitted and the meter is deflected. The field coil can be tested for continuity by joining its ends together, when a deflection should be obtained on placing. it over the core 15. Absence of deflection indicates a break in the winding. Fig. 3 shows an armature search head comprising a handle 17 and two parallel casings 18, 19, each carried by a slotted limb 20 which is secured to the handle 17 by a bolt 21 passing through the slots so that the distance apart of the casings 18, 19 can be adjusted. In the casing 18 there is an insulated support block 22 carrying the driver coil 2, the core of which has laminated polepieces 23. The detector coil 3 is similarly mounted in the casing 19. The search head is moved over the armature core face and as it passes over a series of closed windings a continuous reading is obtained. A modification is described for use inside a stator.
GB611651A 1951-03-14 1951-03-14 Improvements relating to electrical testing apparatus Expired GB692659A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB611651A GB692659A (en) 1951-03-14 1951-03-14 Improvements relating to electrical testing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB611651A GB692659A (en) 1951-03-14 1951-03-14 Improvements relating to electrical testing apparatus

Publications (1)

Publication Number Publication Date
GB692659A true GB692659A (en) 1953-06-10

Family

ID=9808673

Family Applications (1)

Application Number Title Priority Date Filing Date
GB611651A Expired GB692659A (en) 1951-03-14 1951-03-14 Improvements relating to electrical testing apparatus

Country Status (1)

Country Link
GB (1) GB692659A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1064627B (en) * 1957-10-05 1959-09-03 Bosch Gmbh Robert Device for testing armature and field coils of electrical machines for shorted turns
GB2156085A (en) * 1984-02-06 1985-10-02 Aelmhults Elektromek Andersson Testing dynamoelectric machines
US4833396A (en) * 1988-04-04 1989-05-23 Hughes Aircraft Company Lead frame short tester
GB2212927A (en) * 1987-11-30 1989-08-02 Plessey Co Plc Testing coils
WO2009018919A1 (en) * 2007-08-08 2009-02-12 Daimler Ag Actuating device
WO2015101422A1 (en) * 2013-12-30 2015-07-09 Abb Technology Ltd. System for condition monitoring of electric machine, mobile phone and method thereof
CN108802553A (en) * 2018-06-12 2018-11-13 广州供电局有限公司 A kind of transformer winding fault state system of condition monitoring

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1064627B (en) * 1957-10-05 1959-09-03 Bosch Gmbh Robert Device for testing armature and field coils of electrical machines for shorted turns
GB2156085A (en) * 1984-02-06 1985-10-02 Aelmhults Elektromek Andersson Testing dynamoelectric machines
GB2212927A (en) * 1987-11-30 1989-08-02 Plessey Co Plc Testing coils
GB2212927B (en) * 1987-11-30 1991-12-04 Plessey Co Plc Test method and test apparatus
US4833396A (en) * 1988-04-04 1989-05-23 Hughes Aircraft Company Lead frame short tester
GR890100112A (en) * 1988-04-04 1990-01-31 Hughes Aircraft Co Lead frame short tester
WO2009018919A1 (en) * 2007-08-08 2009-02-12 Daimler Ag Actuating device
US8235011B2 (en) 2007-08-08 2012-08-07 Daimler Ag Actuating device
WO2015101422A1 (en) * 2013-12-30 2015-07-09 Abb Technology Ltd. System for condition monitoring of electric machine, mobile phone and method thereof
CN105874344A (en) * 2013-12-30 2016-08-17 Abb技术有限公司 System for condition monitoring of electric machine, mobile phone and method thereof
CN105874344B (en) * 2013-12-30 2019-01-04 Abb瑞士股份有限公司 System, mobile phone and its method of status monitoring for motor
US10184986B2 (en) 2013-12-30 2019-01-22 Abb Schweiz Ag System for condition monitoring of electric machine, mobile phone and method thereof
US10353004B2 (en) 2013-12-30 2019-07-16 Abb Schweiz Ag Method and system for detecting rotor fault using triaxial magnetic field sensor
CN108802553A (en) * 2018-06-12 2018-11-13 广州供电局有限公司 A kind of transformer winding fault state system of condition monitoring

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