GB1018681A - Improved apparatus for the measurement of insulation from earth of electrical networks - Google Patents

Improved apparatus for the measurement of insulation from earth of electrical networks

Info

Publication number
GB1018681A
GB1018681A GB28995/63A GB2899563A GB1018681A GB 1018681 A GB1018681 A GB 1018681A GB 28995/63 A GB28995/63 A GB 28995/63A GB 2899563 A GB2899563 A GB 2899563A GB 1018681 A GB1018681 A GB 1018681A
Authority
GB
United Kingdom
Prior art keywords
voltage
network
resistance
earth
insulation resistance
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
GB28995/63A
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.)
Charbonnages de France CDF
Original Assignee
Charbonnages de France CDF
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 Charbonnages de France CDF filed Critical Charbonnages de France CDF
Publication of GB1018681A publication Critical patent/GB1018681A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
    • H02H3/17—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass by means of an auxiliary voltage injected into the installation to be protected
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
    • G01R27/18—Measuring resistance to earth, i.e. line to ground

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

1,018,681. Measuring insulation and resistances. CHARBONNAGES DE FRANCE. July 22, 1963 [July 24, 1962], No. 28995/63. Heading G1U. An apparatus for measuring the insulation resistance to earth of an alternating current network 2 (shown as a 3 phase supply) with an insulated neutral, and which permits an accurate measurement to be made irrespective of voltage variations in the network, includes a circuit 14 which supplies a d.c. voltage proportional to the voltage of the network, a coupling 3 including a resistance 10 connected via rectifiers between the phases of the network and earth across which is derived a voltage proportional to the current flowing through the coupling, a circuit 18 including a capacitor which is alternately charged to the voltage proportional to that of the network and then discharged to the voltage proportional to the current through the coupling; and a device for measuring the discharge time of the condenser, which will be a function of the insulation resistance to earth of the network. The current through the polarized coupling 3 will be increased as the insulation resistance decreases and hence the voltage U D across the resistance 10 will be related to the insulation resistance. However it will also depend on the network voltage. A voltage proportional to the network voltage may therefore be used to supply a multivibrator arrangement including the transistors 19A, 19B, and the voltage U D may be applied to the transistor bases. The charge and discharge times of the multivibrator capacitors 11A and 11B depend on the difference between these two voltages, which is related to the insulation resistance, so that the output frequency of the multivibrator depends only on this resistance. A measurement of this frequency therefore yields the required information. The frequency signal may be transmitted over transmission lines to a distance and still faithfully retain the information. A simpler circuit incorporating a mechanical switch and a single capacitor 11 is described (Fig. 1 not shown). The network voltage and the voltage U D are alternately switched to the capacitor, whose discharge time may be read directly by a device such as a ballistic galvanometer connected across it.
GB28995/63A 1962-07-24 1963-07-22 Improved apparatus for the measurement of insulation from earth of electrical networks Expired GB1018681A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR904946A FR1338421A (en) 1962-07-24 1962-07-24 Improved method and device for measuring insulation to earth of electrical networks

Publications (1)

Publication Number Publication Date
GB1018681A true GB1018681A (en) 1966-02-02

Family

ID=8783836

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28995/63A Expired GB1018681A (en) 1962-07-24 1963-07-22 Improved apparatus for the measurement of insulation from earth of electrical networks

Country Status (4)

Country Link
BE (1) BE635302A (en)
DE (1) DE1261597B (en)
FR (1) FR1338421A (en)
GB (1) GB1018681A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1207027B (en) * 1980-06-26 1989-05-17 Ravida Antonino IMPROVED LIFE-SAVING DEVICE.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1035760B (en) * 1957-05-08 1958-08-07 Siemens Ag Device for determining the short-circuit current strength in electrical power networks
DE1044953B (en) * 1958-01-11 1958-11-27 Franz Fuehrer Dr Ing Method and device for determining whether the short-circuit current is exceeded or not reached by the zeroing and earthing conditions at AC tapping points
DE1089471B (en) * 1958-11-18 1960-09-22 Siemens Ag Insulation monitoring device

Also Published As

Publication number Publication date
DE1261597B (en) 1968-02-22
FR1338421A (en) 1963-09-27
BE635302A (en) 1900-01-01

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