EP0204873A1 - Circuit breaker monitor - Google Patents

Circuit breaker monitor Download PDF

Info

Publication number
EP0204873A1
EP0204873A1 EP85304097A EP85304097A EP0204873A1 EP 0204873 A1 EP0204873 A1 EP 0204873A1 EP 85304097 A EP85304097 A EP 85304097A EP 85304097 A EP85304097 A EP 85304097A EP 0204873 A1 EP0204873 A1 EP 0204873A1
Authority
EP
European Patent Office
Prior art keywords
circuit breaker
monitor
current
quantum
recording
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.)
Withdrawn
Application number
EP85304097A
Other languages
German (de)
French (fr)
Inventor
Ronald Erwin Niemack
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.)
CONTROL LOGIC Pty Ltd
Original Assignee
CONTROL LOGIC Pty Ltd
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 to ZA844116A priority Critical patent/ZA844116B/xx
Application filed by CONTROL LOGIC Pty Ltd filed Critical CONTROL LOGIC Pty Ltd
Priority to EP85304097A priority patent/EP0204873A1/en
Publication of EP0204873A1 publication Critical patent/EP0204873A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/0015—Means for testing or for inspecting contacts, e.g. wear indicator

Definitions

  • THIS INVENTION relates to a monitor for breakers for electric circuits.
  • Electric circuit breakers generally have a specified maximum current loading which should not be exceeded before they are maintained. This loading is given by their manufacturers in terms of amperes in a particular time, and it is intended that this figure should be used as a guide for the user in determining when the circuit breaker requires maintenance.
  • a circuit breaker monitor comprising current measuring means adapted to measure the quantum of current which causes the circuit breaker to trip out, and recording means adapted to record the measured quantum.
  • a method of operating an electrical circuit breaker monitor which is characterised by measuring, by using a current measuring means, the quantum of current which causes the circuit breaker to trip out, and recording the measured quantum.
  • a feature of the invention provides for the measuring means to be a peak detector and the recording means to be a counter, adapted to record accumulated numeric counts proportional to the magnitude of the detected peak, and preferably counts for successive peaks accumulated in a running total.
  • an input line 1 passes through a circuit breaker indicated diagrammatically by numeral 2 and on to a variety of user positions from numeral 3.
  • a measuring means 4 is located in the line 1 prior to the circuit breaker 2.
  • the measuring means 4 is a peak detector located in series in the input line, and will detect peaks of currents of a magnitude which would cause the circuit breaker to trip.
  • a recorder 6 Connected via a line 5 to the peak detector, is a recorder 6, which comprises a counter with an analogue to digital converter, so that a count will be given in accordance with the magnitude of the peak measured by the peak detector 4. This count will be displayed on a display output 7, and each time the counter counts further magnitudes of peaks, the output play 7 will be updated to maintain a running total.
  • the invention provides useful apparatus for assisting in the maintenance of circuit breakers.
  • the current measuring means need not be a peak detector, and may measure current as a function of time
  • the recording means could be a drum graph or the like.

Landscapes

  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

A monitor for a circuit breaker includes current monitoring means in the form of a peak detector for measuring the quantum of current which causes the circuit breaker to trip out and means for recording this measured quantum on a cumulative basis.

Description

  • THIS INVENTION relates to a monitor for breakers for electric circuits.
  • Electric circuit breakers generally have a specified maximum current loading which should not be exceeded before they are maintained. This loading is given by their manufacturers in terms of amperes in a particular time, and it is intended that this figure should be used as a guide for the user in determining when the circuit breaker requires maintenance.
  • However, there is no real known way for a user to establish what loading the circuit breaker has undergone at any particular time.
  • Although the number of trips of the circuit breaker may be known, this does not give an accurate reflection of the corresponding current that has loaded it.
  • It is an object of this invention to at least alleviate this difficulty.
  • In accordance with this invention there is provided a circuit breaker monitor comprising current measuring means adapted to measure the quantum of current which causes the circuit breaker to trip out, and recording means adapted to record the measured quantum.
  • Also according to the present invention, there is provided a method of operating an electrical circuit breaker monitor which is characterised by measuring, by using a current measuring means, the quantum of current which causes the circuit breaker to trip out, and recording the measured quantum.
  • A feature of the invention provides for the measuring means to be a peak detector and the recording means to be a counter, adapted to record accumulated numeric counts proportional to the magnitude of the detected peak, and preferably counts for successive peaks accumulated in a running total.
  • An embodiment of the invention is described below by way of example only, and with reference to the accompanying drawing, which is a diagrammatic representation of one example of a circuit breaker monitor according to the invention.
  • As illustrated, an input line 1 passes through a circuit breaker indicated diagrammatically by numeral 2 and on to a variety of user positions from numeral 3.
  • A measuring means 4 is located in the line 1 prior to the circuit breaker 2. The measuring means 4 is a peak detector located in series in the input line, and will detect peaks of currents of a magnitude which would cause the circuit breaker to trip.
  • Connected via a line 5 to the peak detector, is a recorder 6, which comprises a counter with an analogue to digital converter, so that a count will be given in accordance with the magnitude of the peak measured by the peak detector 4. This count will be displayed on a display output 7, and each time the counter counts further magnitudes of peaks, the output play 7 will be updated to maintain a running total.
  • In use, each time the circuit breaker trips, a new total count will be shown on the display 7 of the recorder, and the total count will reflect the magnitude of the current which has loaded the circuit breaker in the period under consideration. This count will be translated into the number of permissable counts before maintenance on the circuit breaker is required. After maintenance on the circuit breaker, the counter is reset to zero and a new counting cycle can commence.
  • It is considered that the invention provides useful apparatus for assisting in the maintenance of circuit breakers.
  • Many variations may be made to the above embodiment without departing from the scope of the invention. For example, the current measuring means need not be a peak detector, and may measure current as a function of time, and the recording means could be a drum graph or the like.

Claims (7)

1. A circuit breaker monitor comprising current measuring means adapted to measure the quantum of current which causes the circuit breaker to trip out, and recording means adapted to record the measured quantums.
2. A monitor as claimed in Claim 1 in which the measuring means is a peak detector.
3. A monitor as claimed in Claim 2 in which the recording means is a counter, adapted to record accumulated numeric counts proportional to the magnitude of the detected peaks.
4. A monitor as claimed in Claim 3 in which the counts for successive peaks are accumulated in a running total.
5. A method of operating an electrical circuit breaker monitor which is characterised by measuring, by using a current measuring means, the quantum of current which causes the circuit breaker to trip out, and recording the measured quantum.
6. A method according to Claim 5 which involves recording accumulated numeric counts which are proportional to the magnitude of the detected peaks.
7. A method according to Claim 6 in which a running total of the numeric counts relating to successive peaks is kept.
EP85304097A 1983-03-03 1985-06-10 Circuit breaker monitor Withdrawn EP0204873A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ZA844116A ZA844116B (en) 1983-03-03 1984-05-30
EP85304097A EP0204873A1 (en) 1985-06-10 1985-06-10 Circuit breaker monitor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP85304097A EP0204873A1 (en) 1985-06-10 1985-06-10 Circuit breaker monitor

Publications (1)

Publication Number Publication Date
EP0204873A1 true EP0204873A1 (en) 1986-12-17

Family

ID=8194256

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85304097A Withdrawn EP0204873A1 (en) 1983-03-03 1985-06-10 Circuit breaker monitor

Country Status (1)

Country Link
EP (1) EP0204873A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0327692A1 (en) * 1988-01-28 1989-08-16 Licentia Patent-Verwaltungs-GmbH Operating indicator for circuit breakers
JP2012186960A (en) * 2011-03-07 2012-09-27 Toshiba Corp Monitor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1936552A1 (en) * 1969-07-18 1971-03-18 Bbc Brown Boveri & Cie Measurement method for measuring the contact wear of high-voltage circuit breakers
US3678372A (en) * 1970-04-07 1972-07-18 Westinghouse Electric Corp Portable circuit breaker tester for calibrating a circuit breaker over a wide range of current
DE2640921A1 (en) * 1976-09-08 1978-03-09 Siemens Ag Vacuum switchgear with contact wear monitor - has counter circuit to which is applicable electric magnitude proportional to current across contacts
DE2727378A1 (en) * 1977-06-15 1979-01-04 Siemens Ag Contact wear monitor with comparison system - compares reference wear value with instantaneous wear values determined from load current

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1936552A1 (en) * 1969-07-18 1971-03-18 Bbc Brown Boveri & Cie Measurement method for measuring the contact wear of high-voltage circuit breakers
US3678372A (en) * 1970-04-07 1972-07-18 Westinghouse Electric Corp Portable circuit breaker tester for calibrating a circuit breaker over a wide range of current
DE2640921A1 (en) * 1976-09-08 1978-03-09 Siemens Ag Vacuum switchgear with contact wear monitor - has counter circuit to which is applicable electric magnitude proportional to current across contacts
DE2727378A1 (en) * 1977-06-15 1979-01-04 Siemens Ag Contact wear monitor with comparison system - compares reference wear value with instantaneous wear values determined from load current

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0327692A1 (en) * 1988-01-28 1989-08-16 Licentia Patent-Verwaltungs-GmbH Operating indicator for circuit breakers
JP2012186960A (en) * 2011-03-07 2012-09-27 Toshiba Corp Monitor

Similar Documents

Publication Publication Date Title
US5124624A (en) Arrangement for electrical measurement
US4780786A (en) Solid-state trip unit of an electrical circuit breaker with contact wear indicator
US6628113B2 (en) Surge current measurement
EP0793107A2 (en) Apparatus for triggering alarms and waveform capture in an electric power system
US4500969A (en) Method and apparatus for determining stress on hoisting equipment
JPS61292067A (en) Method for measuring electric energy
EP0204873A1 (en) Circuit breaker monitor
US4283678A (en) Cable condition analyzing system for electric arc furnace conductors
US4341995A (en) Velocity profile analyzer
GB2171212A (en) Circuit breaker monitor
US5114665A (en) Autonormalizing reactimeter
EP0560195B1 (en) An actual operating time indicator
JPS5763461A (en) Device for testing watermeter
JP2741132B2 (en) Power monitoring recorder
GB1471905A (en) Weighing apparatus with fault-detection facility
DE3832561A1 (en) Method for determining the mass of heavy bodies and circuit arrangement for carrying out this method
SU924608A1 (en) Device for measuring amplitude coefficient
JP2635491B2 (en) Operation result display device
KR200175333Y1 (en) Measuring instrument of line load at recloser in distribution line
JPH0225159B2 (en)
JPS6486080A (en) Method and apparatus for diagnosing abnormality of current detector
Zbasnik et al. Operation of the 8-T, 1-m-diameter test facility at Lawrence Livermore National Laboratory
JPS5658623A (en) Detecting method for load of hoisting machine in crane and the like
KR830000136B1 (en) Demand controller
JP2951088B2 (en) Freeness meter abnormality detection device

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE FR IT LI LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19870618

RIN1 Information on inventor provided before grant (corrected)

Inventor name: NIEMACK, RONALD ERWIN