NL7706316A - Current measuring system with earthing detector - includes differential amplifier with positive and negative feedback loops and current measuring resistor in negative loop - Google Patents

Current measuring system with earthing detector - includes differential amplifier with positive and negative feedback loops and current measuring resistor in negative loop

Info

Publication number
NL7706316A
NL7706316A NL7706316A NL7706316A NL7706316A NL 7706316 A NL7706316 A NL 7706316A NL 7706316 A NL7706316 A NL 7706316A NL 7706316 A NL7706316 A NL 7706316A NL 7706316 A NL7706316 A NL 7706316A
Authority
NL
Netherlands
Prior art keywords
current measuring
measuring resistor
negative
differential amplifier
negative feedback
Prior art date
Application number
NL7706316A
Other languages
Dutch (nl)
Original Assignee
Hazemeijer Bv
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
Priority claimed from NL7607752A external-priority patent/NL185241C/en
Application filed by Hazemeijer Bv filed Critical Hazemeijer Bv
Priority to NL7706316A priority Critical patent/NL7706316A/en
Priority to BE1008220A priority patent/BE856056A/en
Priority to GB27220/77A priority patent/GB1582035A/en
Priority to SE7707606A priority patent/SE421352B/en
Priority to AT0482877A priority patent/AT364018B/en
Priority to DE2730874A priority patent/DE2730874C2/en
Priority to DK310277A priority patent/DK147215C/en
Priority to CH844277A priority patent/CH628441A5/en
Priority to NO772476A priority patent/NO148046C/en
Priority to ES460665A priority patent/ES460665A1/en
Priority to IT25654/77A priority patent/IT1077324B/en
Priority to FR7721755A priority patent/FR2361663A1/en
Priority to JP52084021A priority patent/JPS5945106B2/en
Publication of NL7706316A publication Critical patent/NL7706316A/en
Priority to US06/014,089 priority patent/US4293813A/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/18—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using conversion of DC into AC, e.g. with choppers
    • G01R19/20—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using conversion of DC into AC, e.g. with choppers using transductors, i.e. a magnetic core transducer the saturation of which is cyclically reversed by an AC source on the secondary side
    • 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
    • H02H3/26—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents
    • H02H3/32—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
    • H02H3/33—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers
    • H02H3/332—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers with means responsive to dc component in the fault current

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

The current detector circuit is designed to detect an abrupt change in voltage distribution, such as may occur during a short circuit to earth. The key component is a differential amplifier with positive feedback and with negative feedback through a current measuring resistor. The latter, and the load impedance may be either on the earth or the reference potential side of the negative feedback path. The current measuring resistor is connected in parallel with a series circuit comprising a second resistor and the emitter-collector path of a transistor. The current measuring resistor may also be connected into a current mirror circuit.
NL7706316A 1976-07-13 1977-06-08 Current measuring system with earthing detector - includes differential amplifier with positive and negative feedback loops and current measuring resistor in negative loop NL7706316A (en)

Priority Applications (14)

Application Number Priority Date Filing Date Title
NL7706316A NL7706316A (en) 1976-07-13 1977-06-08 Current measuring system with earthing detector - includes differential amplifier with positive and negative feedback loops and current measuring resistor in negative loop
BE1008220A BE856056A (en) 1976-07-13 1977-06-23 CURRENT MEASUREMENT SYSTEM, MORE PARTICULARLY APPLICABLE AS EARTH LAKE DETECTION SYSTEM, AND FUNCTIONAL DEVICE EQUIPPED WITH A SUCH SYSTEM, SUCH AS A GND SWITCH
GB27220/77A GB1582035A (en) 1976-07-13 1977-06-29 Current sensing system particularly suitable for use as an earth leakage detection system and functional device equipped with such a system
SE7707606A SE421352B (en) 1976-07-13 1977-06-30 POWER METER, SPECIFICALLY EASY AS DETECTOR DEVICE FOR EARTH LICKING
AT0482877A AT364018B (en) 1976-07-13 1977-07-06 CURRENT MEASURING SYSTEM, ESPECIALLY FOR USE AS A FAULT CURRENT DETECTION SYSTEM
CH844277A CH628441A5 (en) 1976-07-13 1977-07-08 CURRENT MEASURING CIRCUIT ARRANGEMENT AND USE THEREOF IN A FAULT CURRENT CIRCUIT BREAKER.
DK310277A DK147215C (en) 1976-07-13 1977-07-08 POWER GRINDER
DE2730874A DE2730874C2 (en) 1976-07-13 1977-07-08 Arrangement for detecting a current
NO772476A NO148046C (en) 1976-07-13 1977-07-12 CURRENT MEASURING SYSTEM, SPECIAL TO USE AS AN ERROR CURRENT DETECTION SYSTEM.
ES460665A ES460665A1 (en) 1976-07-13 1977-07-12 Current measuring system
IT25654/77A IT1077324B (en) 1976-07-13 1977-07-12 CURRENT MEASUREMENT SYSTEM PARTICULARLY USABLE AS A MASS DISPERSION DETECTION SYSTEM AND FUNCTIONAL DEVICE EQUIPPED WITH A SYSTEM OF THIS TYPE, FOR EXAMPLE A MASS DISPERSION SWITCH
FR7721755A FR2361663A1 (en) 1976-07-13 1977-07-13 CURRENT MEASURING DEVICE, IN PARTICULAR FOR THE DETECTION OF FAULT CURRENTS
JP52084021A JPS5945106B2 (en) 1976-07-13 1977-07-13 Current sensing device particularly suitable for use as a ground leak detection device
US06/014,089 US4293813A (en) 1976-07-13 1979-02-22 Current measuring system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL7607752A NL185241C (en) 1976-07-13 1976-07-13 FLOW MEASUREMENT SYSTEM.
NL7706316A NL7706316A (en) 1976-07-13 1977-06-08 Current measuring system with earthing detector - includes differential amplifier with positive and negative feedback loops and current measuring resistor in negative loop

Publications (1)

Publication Number Publication Date
NL7706316A true NL7706316A (en) 1978-12-12

Family

ID=26645232

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7706316A NL7706316A (en) 1976-07-13 1977-06-08 Current measuring system with earthing detector - includes differential amplifier with positive and negative feedback loops and current measuring resistor in negative loop

Country Status (1)

Country Link
NL (1) NL7706316A (en)

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Legal Events

Date Code Title Description
BA A request for search or an international-type search has been filed
BB A search report has been drawn up
BC A request for examination has been filed
A85 Still pending on 85-01-01
BV The patent application has lapsed