WO2010067299A2 - Electricity meters - Google Patents

Electricity meters Download PDF

Info

Publication number
WO2010067299A2
WO2010067299A2 PCT/IB2009/055546 IB2009055546W WO2010067299A2 WO 2010067299 A2 WO2010067299 A2 WO 2010067299A2 IB 2009055546 W IB2009055546 W IB 2009055546W WO 2010067299 A2 WO2010067299 A2 WO 2010067299A2
Authority
WO
WIPO (PCT)
Prior art keywords
circuit breaker
temperature
electrical
electricity meter
controller
Prior art date
Application number
PCT/IB2009/055546
Other languages
French (fr)
Other versions
WO2010067299A3 (en
Inventor
Desigan Govender
Original Assignee
Grinpal Energy Management (Pty) Limited
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 Grinpal Energy Management (Pty) Limited filed Critical Grinpal Energy Management (Pty) Limited
Priority to GB1109090A priority Critical patent/GB2477890A/en
Publication of WO2010067299A2 publication Critical patent/WO2010067299A2/en
Publication of WO2010067299A3 publication Critical patent/WO2010067299A3/en
Priority to ZA2011/03828A priority patent/ZA201103828B/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
    • G01R11/02—Constructional details
    • G01R11/17—Compensating for errors; Adjusting or regulating means therefor
    • G01R11/18—Compensating for variations in ambient conditions
    • G01R11/185—Temperature compensation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
    • G01R11/02—Constructional details
    • G01R11/25—Arrangements for indicating or signalling faults
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
    • G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/58—Electric connections to or between contacts; Terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches

Definitions

  • This invention relates to electricity meters.
  • this invention relates to a prepayment electricity meter.
  • a prepayment electricity meter is installed at a user distribution endpoint and connected between a high voltage supply and a load at the user distribution endpoint to control supply of electricity to the load.
  • a controller of the meter is configured to measure electrical energy used and to compare the energy used with an amount of pre-paid electrical energy to determine an energy credit.
  • the controller is controllaby connected to a circuit breaker and operable to close the circuit breaker if the energy credit is positive and to open the circuit breaker if the energy credit reaches a zero amount.
  • the meter may be in the form of a single unit mounted in or at the user distribution endpoint.
  • the meter may be in the form of a split unit, of which one part is installed at the user distribution endpoint and another part is located remote from the user distribution endpoint.
  • the circuit breaker is connected in line between the electrical energy supply line and the user distribution endpoint load via circuit breaker terminals.
  • an electricity meter which includes a circuit breaker having electrical terminals connectable to electrical cables leading from an electrical source and connectable to electrical cables leading to a load respectively, the circuit breaker operable to open the circuit between the source and the load terminals and to close the circuit between the source and the load; a temperature sensor in thermal communication with the electrical terminals, the temperature sensor operable to measure a temperature at the terminals; a controller connected to the temperature sensor for receiving temperature readings from the temperature sensor and controllably connected to the circuit breaker for opening and closing the circuit breaker, the controller operable to read the temperature from the temperature sensor and to open the circuit breaker when the temperature exceeds predefined temperature parameters.
  • the electricity meter may be a prepayment electricity meter, with the controller operable to measure electrical energy used and to compare the energy used with an amount of pre-paid electrical energy to determine an energy credit.
  • the controller being controllably connected to the circuit breaker may be operable to close the circuit breaker if the energy credit is positive and to open the circuit breaker if the energy credit reaches a zero amount.
  • the temperature sensor may include a semiconductor component.
  • the temperature sensor may include an integrated circuit.
  • the electricity meter may be in the form of a single unit.
  • the electricity meter may be in the form of two units, one of which contains the controller and the other of which contains the circuit breaker.
  • the invention extends of a method of operating an electricity meter connected in line between an electrical supply and an electrical load, which includes monitoring temperature parameters proximate electrical terminals of an electricity meter; opening a circuit breaker when the temperature parameters exceed certain predefined thresholds.
  • the temperature parameters may be in the form of any one of absolute temperature values and a temperature gradient.
  • the method may include pre-programming a controller, connected to a temperature sensor and controllably connected to a circuit breaker, with temperature parameters.
  • FIG. 1 shows a schematic block diagram of an electricity meter in accordance with the invention.
  • Figure 1 shows a prepayment electricity meter 10 in accordance with the invention.
  • the meter 10 includes a housing 12. In the housing there is provided a controller 14, which is connected to a semi-conductor temperature sensor 16, and controllably connected to a communications module 18, a display module 22 and a circuit breaker 24.
  • An over-heat disconnect flag 20 is implemented on the controller for recording an overheat event.
  • the meter 10 also includes electrical connection terminals 26.1 and 26.2 for connecting the meter via electrical supply cables 28 to a mains electrical supply 30.
  • the meter 10 also includes electrical connection terminals 32.1 and 32.2 for connecting the meter 10 via cables 34 to a load 36 at a user distribution endpoint 38, such as a domestic dwelling.
  • the controller 14 is operable to sense the flow of electrical current from the supply 30 to the load 38. By measuring the electrical current, the controller 14 can calculate an energy consumption.
  • the controller 14 is also operable to accept a preloaded energy credit either via the central control station 50 or via a user input. The controller is operable to subtract the measured energy consumption from the energy credit.
  • the controller 14 is operable to control the circuit breaker 24, to be closed while the energy credit is positive and to be opened when the energy credit reaches a zero amount.
  • the cores of the cables 28 and 34 are secured to the terminals by screws 40 cooperating with treaded terminal blocks 42.
  • the electrical contact between the cables 28, 34 and the terminal blocks 26 and 32 may cause a high resistance connection with resultant hot spots on the cables 28, 23 and/or the terminal blocks 26, 32.
  • the temperature sensor 16 is arranged to monitor the temperature at the terminals 26, 32.
  • the controller 14 is pre programmed with temperature parameters and reads the sensed temperature from the temperature sensor 16. If the temperature parameters exceed certain pre-defined thresholds, such as an absolute temperature threshold or a temperature gradient, the controller 14 opens the circuit breaker 24 to disconnect the load 36 from the supply 30.
  • the over-heat disconnect flag 20 is set and a fault message is send via the communications module 18 to the central control station 50.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

An electricity meter, which includes a circuit breaker (24) having electrical terminals (26.1, 26.2, 32.1, 32.2) connectable to electrical cables(28) leading from an electrical source (30) and connectable to electrical cables (34) leading to a load (36) respectively, the circuit breaker(24) operable to open the circuit between the source and the load terminals (26.1, 26.2, 32.1, 32.2) and to close the circuit between the source (30) and the load (36), a temperature sensor (16) in thermal communication with the electrical terminals (26.1, 26.2, 32.1, 32.2), the temperature sensor (16) operable to measure a temperature at the terminals (26.1, 26.2, 32.1, 32.2), a controller (14) connected to the temperature sensor (16) for receiving temperature readings from the temperature sensor (16) and controllably connected to the circuit breaker (24) for opening and closing the circuit breaker (24), the controller (14) operable to read the temperature from the temperature sensor (16) and to open the circuit breaker (24) when the temperature exceeds predefined temperature parameters.

Description

ELECTRICITY METERS
This invention relates to electricity meters. In particular, this invention relates to a prepayment electricity meter.
BACKGROUND OF THE INVENTION
A prepayment electricity meter is installed at a user distribution endpoint and connected between a high voltage supply and a load at the user distribution endpoint to control supply of electricity to the load. A controller of the meter is configured to measure electrical energy used and to compare the energy used with an amount of pre-paid electrical energy to determine an energy credit. The controller is controllaby connected to a circuit breaker and operable to close the circuit breaker if the energy credit is positive and to open the circuit breaker if the energy credit reaches a zero amount.
The meter may be in the form of a single unit mounted in or at the user distribution endpoint. Alternatively the meter may be in the form of a split unit, of which one part is installed at the user distribution endpoint and another part is located remote from the user distribution endpoint.
The circuit breaker is connected in line between the electrical energy supply line and the user distribution endpoint load via circuit breaker terminals.
During installation of electrical cables to the circuit breaker terminals, it may happen that electrical cables are not properly fastened to provide low resistance connections between the cables and the circuit breaker terminals. For example, terminal screws may not be properly tightened onto the copper core of the cable. Poor connections are especially problematic in installations where large currents are drawn as they cause heating of circuit breaker terminals and associated cable portions. Accordingly, it is an object of the present invention to provide an electricity meter and associated method with which the applicant believes the aforementioned disadvantages may at least be alleviated.
SUMMARY OF THE INVENTION
According to the invention there is provided an electricity meter which includes a circuit breaker having electrical terminals connectable to electrical cables leading from an electrical source and connectable to electrical cables leading to a load respectively, the circuit breaker operable to open the circuit between the source and the load terminals and to close the circuit between the source and the load; a temperature sensor in thermal communication with the electrical terminals, the temperature sensor operable to measure a temperature at the terminals; a controller connected to the temperature sensor for receiving temperature readings from the temperature sensor and controllably connected to the circuit breaker for opening and closing the circuit breaker, the controller operable to read the temperature from the temperature sensor and to open the circuit breaker when the temperature exceeds predefined temperature parameters.
The electricity meter may be a prepayment electricity meter, with the controller operable to measure electrical energy used and to compare the energy used with an amount of pre-paid electrical energy to determine an energy credit.
The controller being controllably connected to the circuit breaker may be operable to close the circuit breaker if the energy credit is positive and to open the circuit breaker if the energy credit reaches a zero amount. The temperature sensor may include a semiconductor component. The temperature sensor may include an integrated circuit.
The electricity meter may be in the form of a single unit. Alternatively, the electricity meter may be in the form of two units, one of which contains the controller and the other of which contains the circuit breaker.
The invention extends of a method of operating an electricity meter connected in line between an electrical supply and an electrical load, which includes monitoring temperature parameters proximate electrical terminals of an electricity meter; opening a circuit breaker when the temperature parameters exceed certain predefined thresholds.
The temperature parameters may be in the form of any one of absolute temperature values and a temperature gradient.
The method may include pre-programming a controller, connected to a temperature sensor and controllably connected to a circuit breaker, with temperature parameters.
The invention will now be described, by way of example only with reference to the following drawing(s):
DRAWING(S)
In the drawing(s):
Figure 1 shows a schematic block diagram of an electricity meter in accordance with the invention. EMBODIMENT OF THE INVENTION
Figure 1 shows a prepayment electricity meter 10 in accordance with the invention.
The meter 10 includes a housing 12. In the housing there is provided a controller 14, which is connected to a semi-conductor temperature sensor 16, and controllably connected to a communications module 18, a display module 22 and a circuit breaker 24.
An over-heat disconnect flag 20 is implemented on the controller for recording an overheat event.
The meter 10 also includes electrical connection terminals 26.1 and 26.2 for connecting the meter via electrical supply cables 28 to a mains electrical supply 30. The meter 10 also includes electrical connection terminals 32.1 and 32.2 for connecting the meter 10 via cables 34 to a load 36 at a user distribution endpoint 38, such as a domestic dwelling.
In this example the controller 14 is operable to sense the flow of electrical current from the supply 30 to the load 38. By measuring the electrical current, the controller 14 can calculate an energy consumption. The controller 14 is also operable to accept a preloaded energy credit either via the central control station 50 or via a user input. The controller is operable to subtract the measured energy consumption from the energy credit.
In use, the controller 14 is operable to control the circuit breaker 24, to be closed while the energy credit is positive and to be opened when the energy credit reaches a zero amount.
During The cores of the cables 28 and 34 are secured to the terminals by screws 40 cooperating with treaded terminal blocks 42. In use, in event of incorrect installation of the cables 28, 34 into the terminal blocks, for example when the screws 40 are not properly tightened, the electrical contact between the cables 28, 34 and the terminal blocks 26 and 32 may cause a high resistance connection with resultant hot spots on the cables 28, 23 and/or the terminal blocks 26, 32.
The temperature sensor 16 is arranged to monitor the temperature at the terminals 26, 32. The controller 14 is pre programmed with temperature parameters and reads the sensed temperature from the temperature sensor 16. If the temperature parameters exceed certain pre-defined thresholds, such as an absolute temperature threshold or a temperature gradient, the controller 14 opens the circuit breaker 24 to disconnect the load 36 from the supply 30.
Upon the controller 14 sensing the exceeding of the pre-defined thresholds, the over-heat disconnect flag 20 is set and a fault message is send via the communications module 18 to the central control station 50.
It is to be appreciated that the same invention can be employed in various manners on single-phase or multi-phase electricity meters.
The inventor believes that the invention as described and illustrated will reduce the risk associated with the overheating of electricity meters, in particular in harsh environments where electrical installations may be subject to abuse and faulty installation.

Claims

CLAIMS:
1. An electricity meter, which includes a circuit breaker having electrical terminals connectable to electrical cables leading from an electrical source and connectable to electrical cables leading to a load respectively, the circuit breaker operable to open the circuit between the source and the load terminals and to close the circuit between the source and the load; a temperature sensor in thermal communication with the electrical terminals, the temperature sensor operable to measure a temperature at the terminals; a controller connected to the temperature sensor for receiving temperature readings from the temperature sensor and controllably connected to the circuit breaker for opening and closing the circuit breaker, the controller operable to read the temperature from the temperature sensor and to open the circuit breaker when the temperature exceeds predefined temperature parameters.
2. An electricity meter as claimed in claim 1 , in the form of a prepayment electricity meter, with the controller operable to measure electrical energy used and to compare the energy used with an amount of pre-paid electrical energy to determine an energy credit.
3. An electricity meter as claimed in claim 2, in which the controller is operable to close the circuit breaker if the energy credit is positive and to open the circuit breaker if the energy credit reaches a zero amount.
4. An electricity meter as claimed in claim 1 , which is in the form of a single unit.
5. An electricity meter as claimed in claim 1 , which is in the form of two units, one of which contains the controller and the other of which contains the circuit breaker.
6. A method of operating an electricity meter connected in line between an electrical supply and an electrical load, which includes monitoring temperature parameters proximate electrical terminals of an electricity meter; opening a circuit breaker when the temperature parameters exceed certain predefined thresholds.
7. A method as claimed in claim 6, in which the temperature parameters are in the form of any one of absolute temperature values and a temperature gradient.
8. A method as claimed in claim 6, which includes pre-programming a controller, connected to a temperature sensor and controllably connected to a circuit breaker, with temperature parameters.
9. An electricity meter as claimed in claim 1 , substantially as herein described and illustrated.
10. A method as claimed in claim 6, substantially as herein described and illustrated.
11. A new electricity meter and a new method, substantially as herein described.
PCT/IB2009/055546 2008-12-10 2009-12-07 Electricity meters WO2010067299A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1109090A GB2477890A (en) 2008-12-10 2009-12-07 Electricity meter and method of operating the electricity meter
ZA2011/03828A ZA201103828B (en) 2008-12-10 2011-05-25 Electricity meter and method of operating the electricity meter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA200810462 2008-12-10
ZA2008/10462 2008-12-10

Publications (2)

Publication Number Publication Date
WO2010067299A2 true WO2010067299A2 (en) 2010-06-17
WO2010067299A3 WO2010067299A3 (en) 2010-11-04

Family

ID=42243130

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2009/055546 WO2010067299A2 (en) 2008-12-10 2009-12-07 Electricity meters

Country Status (4)

Country Link
AR (1) AR074585A1 (en)
GB (1) GB2477890A (en)
WO (1) WO2010067299A2 (en)
ZA (1) ZA201103828B (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102445576A (en) * 2011-09-08 2012-05-09 北京煜邦电力技术有限公司 Method for performing temperature compensation on metering chip and manganin sheet in electric meter
CN103645361A (en) * 2013-11-28 2014-03-19 国网河南省电力公司鹤壁供电公司 Multifunction electric meter box
RU2520428C1 (en) * 2013-06-21 2014-06-27 Владимир Филиппович Ермаков Microprocessor data recorder for ermakov-gorobets energy audit
WO2014126614A1 (en) * 2013-02-13 2014-08-21 Sensus Usa Inc. Method and apparatus for operating an electricity meter
WO2014158110A1 (en) * 2013-03-25 2014-10-02 Koster Norbert H L Temperature-controlled circuit breaker
CN104123791A (en) * 2014-07-25 2014-10-29 国家电网公司 Prepayment electricity meter balance lower-limit alarm system
EP2815360A4 (en) * 2012-02-17 2015-12-02 Vencore Labs Inc Multi-function electric meter adapter and method for use
CN105301315A (en) * 2015-12-04 2016-02-03 四川有获科技有限公司 Outdoor safety type ammeter system
WO2017031721A1 (en) * 2015-08-26 2017-03-02 深圳市思达仪表有限公司 Prepaid electric energy meter
WO2018053726A1 (en) * 2016-09-21 2018-03-29 深圳市思达仪表有限公司 Method for generating pulses by double manganin sampling circuits of single-phase three-wire electric energy meter
CN109061549A (en) * 2018-10-12 2018-12-21 浙江正泰仪器仪表有限责任公司 A kind of electric energy meter detecting measurement error
CN105675977B (en) * 2016-03-02 2018-12-28 江苏林洋能源股份有限公司 A kind of electric energy meter and method with front stage detection of power loss
US10620241B2 (en) 2012-02-17 2020-04-14 Perspecta Labs Inc. Method and system for packet acquisition, analysis and intrusion detection in field area networks
EP3709029A1 (en) * 2019-03-11 2020-09-16 Honeywell International Inc. Power meter with movable terminal blocks

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4080567A (en) * 1975-06-09 1978-03-21 Duncan Electric Company, Inc. Heat sensitive abnormal condition detecting and indicating device and method
US4565995A (en) * 1983-08-22 1986-01-21 Energy Optics, Inc. Anti-energy diversion system for electric utility meters
GB2279516A (en) * 1993-06-30 1995-01-04 Schlumberger Ind Ltd Electricity supply control systems

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4080567A (en) * 1975-06-09 1978-03-21 Duncan Electric Company, Inc. Heat sensitive abnormal condition detecting and indicating device and method
US4565995A (en) * 1983-08-22 1986-01-21 Energy Optics, Inc. Anti-energy diversion system for electric utility meters
GB2279516A (en) * 1993-06-30 1995-01-04 Schlumberger Ind Ltd Electricity supply control systems

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102445576A (en) * 2011-09-08 2012-05-09 北京煜邦电力技术有限公司 Method for performing temperature compensation on metering chip and manganin sheet in electric meter
US10620241B2 (en) 2012-02-17 2020-04-14 Perspecta Labs Inc. Method and system for packet acquisition, analysis and intrusion detection in field area networks
EP2815360A4 (en) * 2012-02-17 2015-12-02 Vencore Labs Inc Multi-function electric meter adapter and method for use
US9696346B2 (en) 2012-02-17 2017-07-04 Vencore Labs, Inc. Method and system for packet acquistion, analysis and intrusion detection in field area networks
WO2014126614A1 (en) * 2013-02-13 2014-08-21 Sensus Usa Inc. Method and apparatus for operating an electricity meter
US8854217B2 (en) 2013-02-13 2014-10-07 Sensus Spectrum Llc Method and apparatus for operating an electricity meter
TWI596347B (en) * 2013-02-13 2017-08-21 聖賽斯光譜有限責任公司 Method and apparatus for operating an electricity meter
WO2014158110A1 (en) * 2013-03-25 2014-10-02 Koster Norbert H L Temperature-controlled circuit breaker
RU2520428C1 (en) * 2013-06-21 2014-06-27 Владимир Филиппович Ермаков Microprocessor data recorder for ermakov-gorobets energy audit
CN103645361A (en) * 2013-11-28 2014-03-19 国网河南省电力公司鹤壁供电公司 Multifunction electric meter box
CN104123791A (en) * 2014-07-25 2014-10-29 国家电网公司 Prepayment electricity meter balance lower-limit alarm system
WO2017031721A1 (en) * 2015-08-26 2017-03-02 深圳市思达仪表有限公司 Prepaid electric energy meter
CN105301315A (en) * 2015-12-04 2016-02-03 四川有获科技有限公司 Outdoor safety type ammeter system
CN105675977B (en) * 2016-03-02 2018-12-28 江苏林洋能源股份有限公司 A kind of electric energy meter and method with front stage detection of power loss
WO2018053726A1 (en) * 2016-09-21 2018-03-29 深圳市思达仪表有限公司 Method for generating pulses by double manganin sampling circuits of single-phase three-wire electric energy meter
CN109061549A (en) * 2018-10-12 2018-12-21 浙江正泰仪器仪表有限责任公司 A kind of electric energy meter detecting measurement error
CN109061549B (en) * 2018-10-12 2021-03-05 浙江正泰仪器仪表有限责任公司 Electric energy meter for detecting metering error
EP3709029A1 (en) * 2019-03-11 2020-09-16 Honeywell International Inc. Power meter with movable terminal blocks

Also Published As

Publication number Publication date
WO2010067299A3 (en) 2010-11-04
GB201109090D0 (en) 2011-07-13
AR074585A1 (en) 2011-01-26
ZA201103828B (en) 2012-01-25
GB2477890A (en) 2011-08-17

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