GB2171212A - Circuit breaker monitor - Google Patents

Circuit breaker monitor Download PDF

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Publication number
GB2171212A
GB2171212A GB8504261A GB8504261A GB2171212A GB 2171212 A GB2171212 A GB 2171212A GB 8504261 A GB8504261 A GB 8504261A GB 8504261 A GB8504261 A GB 8504261A GB 2171212 A GB2171212 A GB 2171212A
Authority
GB
Grant status
Application
Patent type
Prior art keywords
circuit breaker
monitor
current
measuring means
peak detector
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Withdrawn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
GB8504261A
Other versions
GB8504261D0 (en )
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
Original Assignee
* CONTROL LOGIC
CONTROL LOGIC
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

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00Contacts
    • H01H1/0015Means for testing or for inspecting contacts, e.g. wear indicator

Abstract

A monitor for a circuit breaker 2 includes current monitoring means in the form of a peak detector 4 for measuring the quantum of current which causes the circuit breaker to trip out and means 6 for recording this measured quantum on a cumulative basis. The recording means includes a counter with an analogue to digital converter giving a count in accordance with the magnitude of the peak measured by the peak detector. The count is displayed, 7. A running total is displayed. <IMAGE>

Description

SPECIFICATION Circuit breaker monitor 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.

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 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. Afetr 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.

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 monitor substantially as herein described and with reference to the accompanying drawing.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Circuit breaker monitor 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. 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 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. Afetr 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
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 monitor substantially as herein described and with reference to the accompanying drawing.
GB8504261A 1985-02-19 1985-02-19 Circuit breaker monitor Withdrawn GB2171212A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8504261A GB2171212A (en) 1985-02-19 1985-02-19 Circuit breaker monitor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8504261A GB2171212A (en) 1985-02-19 1985-02-19 Circuit breaker monitor

Publications (2)

Publication Number Publication Date
GB8504261D0 true GB8504261D0 (en) 1985-03-20
GB2171212A true true GB2171212A (en) 1986-08-20

Family

ID=10574736

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8504261A Withdrawn GB2171212A (en) 1985-02-19 1985-02-19 Circuit breaker monitor

Country Status (1)

Country Link
GB (1) GB2171212A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2267190A (en) * 1992-05-15 1993-11-24 Ind Tech Res Inst Circuit breaker with current range indicator
GB2288473A (en) * 1994-03-23 1995-10-18 Gen Electric Circuit breaker

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1588757A (en) * 1976-12-17 1981-04-29 Ibm Monitor for detecting and recording power line disturbances
GB2070356A (en) * 1980-02-26 1981-09-03 Bell & Howell Ltd Apparatus for recording a disturbance on an alternating electrical supply
GB2073968A (en) * 1980-04-15 1981-10-21 Westinghouse Electric Corp Circuit interrupter with multiple display parameter entry means
GB2095932A (en) * 1981-03-28 1982-10-06 Ferranti Ltd Line disturbance monitor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1588757A (en) * 1976-12-17 1981-04-29 Ibm Monitor for detecting and recording power line disturbances
GB2070356A (en) * 1980-02-26 1981-09-03 Bell & Howell Ltd Apparatus for recording a disturbance on an alternating electrical supply
GB2073968A (en) * 1980-04-15 1981-10-21 Westinghouse Electric Corp Circuit interrupter with multiple display parameter entry means
GB2095932A (en) * 1981-03-28 1982-10-06 Ferranti Ltd Line disturbance monitor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2267190A (en) * 1992-05-15 1993-11-24 Ind Tech Res Inst Circuit breaker with current range indicator
GB2288473A (en) * 1994-03-23 1995-10-18 Gen Electric Circuit breaker

Also Published As

Publication number Publication date Type
GB8504261D0 (en) 1985-03-20 application

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)