WO2001037392A1 - Electrical control system - Google Patents
Electrical control system Download PDFInfo
- Publication number
- WO2001037392A1 WO2001037392A1 PCT/GB2000/004389 GB0004389W WO0137392A1 WO 2001037392 A1 WO2001037392 A1 WO 2001037392A1 GB 0004389 W GB0004389 W GB 0004389W WO 0137392 A1 WO0137392 A1 WO 0137392A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- appliance
- control system
- circuit
- appliances
- current consumption
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/50—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads
- H02J2310/56—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads characterised by the condition upon which the selective controlling is based
- H02J2310/58—The condition being electrical
- H02J2310/60—Limiting power consumption in the network or in one section of the network, e.g. load shedding or peak shaving
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
Definitions
- This invention relates to control systems for electricity distribution circuits of small dwellings and other accommodation such as planets and mobile homes sited on holiday parks and mobile offices, and caravans.
- the invention is concerned with a control system for an electricity distribution circuit of the kind, hereinafter referred to as "the kind specified”, which is connected to an electrical supply of limited amperage and is arranged to distribute electricity from the supply to a number of appliances which are connected permanently to the circuit and/or plugged into sockets in the circuit and which are required to be brought into operation from time to time.
- the kind specified an electricity distribution circuit of the kind, hereinafter referred to as "the kind specified”
- Such devices have the disadvantage that they cut off the electricity supply to the whole circuit so that the occupants of, for example, a mobile home are deprived of all facilities such as lighting, heating and cooking until the device has been reset, which may require the attendance of a holiday park warden.
- the use of electricity in mobile homes is increasing as gas appliances are replaced by their electrical equivalents for energy-saving and safety reasons. There is therefore a growing demand for a more convenient way of preventing overloading of the electricity distribution circuits used in mobile homes (and other forms of accommodation including caravans).
- a control system for an electricity distribution circuit of the kind specified comprising means operable, in use, continuously to sense the total current consumption of the circuit and adapted if any one or more appliances is or are brought into operation and as a result causes the total current consumption to exceed a predetermined maximum value, automatically to render at least one appliance inoperative so that the current consumption of the circuit does not remain above said maximum value.
- the control system includes means adapted when at least one appliance has been rendered inoperative by the control system automatically to render such appliance inoperable, such means being operable only by a user to render the said appliance operable.
- the said appliance is an appliance which, if left switched on when it has been rendered inoperative by the control system, could create a dangerous situation if it were to become operative again as a result of the control system restoring the electricity supply to it without the user being aware of it.
- Examples of such an appliance are an electric toaster, hairdryer and cooker, all of which might cause a fire if they are rendered operative without the user being aware of it.
- Such a condition is prevented by the appliance being rendered inoperable by the control system until the user operates the said means to render the appliance operable again.
- These means may include a manually operable reset button.
- the circuit may be adapted when operated in response to an increase in the total current consumption above such predetermined value to switch off at least one appliance which is already in operation, or/and to prevent at least one appliance being brought into operation. If the circuit is provided with an overload cut-out device, the control system accordingly prevents such device being operated and cutting off the electricity supply to the circuit.
- the control system is adapted to select the appliance or appliances which is or are rendered inoperative in a potential overload condition on the basis of predetermined operational priorities of the appliances connected to the circuit.
- the system is arranged to operate on the principle that it may be preferable or desirable to switch off one appliance rather than another for any one of a number of reasons.
- the circuit may include an appliance such as an immersion water heater which can be switched off for a short period, while another appliance such as a kettle requiring only a short period of use is brought into operation and the system in this case is adapted to give priority to the second appliance.
- the system is adapted to give the utmost priority over all other appliances to any appliance which for safety reasons ought not to be switched off, for example, fixed lighting. Priority may even be given to appliances whose operation the user may not wish to be interrupted simply for personal convenience, for example a television.
- appliances are arranged to be rendered inoperative in groups each comprising two or more appliances having similar priorities or only one appliance.
- the control system may be provided with means for varying the said predetermined maximum value of current consumption.
- the control system may incorporate the facility of preventing an appliance in any one group being brought into operation until one or more appliances in the same or another group which are already in operation, is or are switched off manually.
- the system may include an audible or/and visual indicator which is arranged to warn a user when switching on an appliance if such action has caused an overload condition and that the said appliance will not become operative until the user has switched off at least one other appliance of an appropriate wattage in the same group.
- the system may include an indicator for displaying the maximum current available and the actual current consumption of the circuit at all times so that a user can take pre-emptive action before the system automatically switches off any appliance.
- FIGURE 1 is a schematic drawing of one form of control system according to the invention.
- FIGURE 2 shows the control and information panel of the control system
- FIGURE 3 shows the functional blocks of the software incorporated in the control system
- FIGURE 4 is a schematic drawing of an electricity distribution circuit incorporating another form of control system according to the invention.
- FIGURE 1 of the drawings shows a preferred form of control system according to the invention connected to an electricity distribution circuit in which the mains electricity supply 1 is typically limited in current by an external thermo-magnetic circuit breaker.
- the electrical loads 2,3,4,5,6 comprise all of the electrical loads of the circuit, including lighting, cooking, heating and electrical appliances.
- the load comprising lights and essential services 2 is classified as uninterruptible.
- the loads for cooking and mains sockets 3,4 are classified as interruptible with manual restoration.
- the loads 5,6 for space and water heating are classified as interruptible with automatic restoration.
- Each current sensor comprises a 5m ⁇ resistive current shunt carrying the return current from its respective load, and a differential signal amplifier. This outputs an analogue voltage in proportion to the mains current drawn.
- the control system 12 includes a microcontroller (single chip microprocessor) with analogue to digital converters. This allows the conversion of the current sensor readings 7,8,9,10,11 to digital values, which are then stored and processed by the microcontroller.
- the processor is programmed to sample the instantaneous current for each sensor at 2mS intervals, giving ten samples of the current waveform for each mains cycle at 50Hz. These ten readings are then arithmetically processed to give an approximation of the root mean squared current for each sensor. Detection of a 60Hz mains waveform results in the sampling interval being decreased to 1.677mS, ensuring that ten samples are stored and processed for each mains cycle.
- the microcontroller in the control system 12 provides digital outputs to control the power interrupters 13,14,15,16,17.
- the interrupters comprise electro-mechanical relays or solid state triacs with the ability to remove power from the load under the control of the microcontroller.
- the control systems is also connected to a user control and information panel 18, as shown in FIGURE 2.
- This comprises a liquid crystal display 20, function buttons 21, an alarm buzzer 22 and a reset button 23.
- the control panel allows the setting of the maximum current available by means of the function buttons. In the case of the invention being applied to touring caravans and similar, this limit is variable and adjustable by the end user, to suit the mains electricity supply. In fixed installations, the current limit is set by the installer and not adjustable by the end user.
- the control panel display indicates to the user the current usage and current limit. In the event of shedding either of the manually resettable loads 3,4, the display indicates that an overload has occurred and an audible alarm is sounded by the buzzer 22.
- Operation of the reset button causes the microcontroller to restore power to the manually restored loads 3,4 by operation of the interrupter relays 13, 14.
- the control panel 18 and interrupter relays 15,16, together with the room temperature sensor 19 also provide the function of a thermostatic space heating control. This allows the room temperature to be compared to the desired setting, and the required level of heating to be switched by the interrupter relays.
- the space heater 5 comprises two elements of nominally one kilowatt and two kilowatts which when operated together give three kilowatts space heating. The control chooses the power level subject to the thermostat demand and available current.
- control panel allows the water heater 6 to be switched on and off by the user, by enabling or disabling the interrupter relay
- a load such as the space heater 5 may be of fixed wattage and without user switches or thermostats.
- the current may be calculated from the state of the relays 15,16 and the specification of the space heater 5.
- the respective current sensor 10 is therefore redundant and not used.
- FIGURE 3 represents the functional blocks of the software embedded within the control system 20 required to perform the load shedding and restoration functions.
- the initialisation of registers is performed, and the processor tests to see whether 50Hz or 60Hz mains is in use (24).
- the main loop 25,26,27,28,29,30,31 is performed once per mains cycle.
- the software digitally filters each current value by averaging.
- the averaging is designed to give a response faster than the thermal response of the external supply circuit breaker.
- the room temperature is measured by reading an analogue to digital converter connected to the room temperature sensor.
- the status of the user control panel is received via a serial communications link.
- the software receives this information, and evaluates the desired space heating power and water heater status (26).
- the information sent from the user control panel also contains the maximum current setting, which is stored.
- Information to be displayed to the user is transmitted by the serial communications link, back to the user control panel.
- the status of the reset button is transmitted from the user control, and if pressed, flags are reset to enable restoration of power to the manually restored loads (27).
- the result of this process is a byte value which represents, in binary format, the desired loads, before power limitations are accounted for.
- the algorithm for power shedding consists of calculating all possible combinations of outputs. With five controlled loads this gives thirty two combinations from binary 00000 representing all loads disabled to binary 11 1 11 representing all loads enabled (28). Each of the thirty two combinations is logically anded to mask loads which have been disabled, and tested to find the best valid combination.
- the total current is calculated by adding up the currents of each load in that combination.
- the system has allocated a weighted score to each load. For each combination of load, the system calculates the total score for the loads in that combination. If the total current does not exceed the current limit, and the weighted score for that combination is greater than the previous best found score then that combination becomes the best found score.
- the resulting best combination represents, in binary, those loads which should be enabled and disabled.
- the system will then immediately turn off digital outputs controlling load relays not enabled in the best combination (29). As a result the corresponding appliances are rendered inoperative.
- a software timer (30) is reset when the best combination has changed. If the value of the best combination is stable for more than one second, the timer switches on the digital outputs connected to the load relays, as enabled in the best combination. Manually restored loads are not subject to this timer, and are restored immediately.
- FIGURE 4 of the drawings shows an electricity distribution circuit installed in, for example, a mobile home and comprising four separate ring circuits R1,R2,R3 and R4.
- ring circuits have a range of electrical appliances connected to them either permanently or through sockets into which the appliances are plugged, and the appliances are arranged in groups of different operational priorities as follows :-
- the ring circuit RI is for a group of electrical appliances which when brought into operation should preferably remain in operation for as long as required, for example for safety reasons as in the case of lighting, or simply for personal convenience as in the case of a television.
- Ring circuit R2 is for appliances of a lower operational priority in that it is desirable that their operation should not be interrupted, that is to say in the case of cooking appliances interrupting the cooking of food is likely to spoil the food which in the case of a microwave may lead to food poisoning.
- Ring circuit R3 is for appliances where it is not quite so desirable to maintain their operation, for example the use of a kettle or toaster can be delayed or interrupted at little inconvenience. Appliances having a low operational priority are connected to ring circuit R4. Thus, in the case of space or water heaters or air conditioners their operation can be interrupted for short periods and resumed subsequently without affecting the overall heating or air conditioning effect.
- the ring circuits are all connected to a mains supply LN through an electronic control system 32 which is also connected to a display panel 33.
- the control system 32 is constructed and arranged to control the supply of electrical current to the groups of appliances and sockets in accordance with the operational priorities set out above.
- the control system includes a current sensor and electronic micro- controller and is arranged to sense the current consumption of the circuit at all times.
- the system is adapted in the event that any appliance is switched on and as a result the current consumption exceeds the maximum amperage of the mains supply, either to switch off the group containing that appliance or to switch off another group of appliances according to the established priorities.
- the display panel provides a visual indication of the maximum current available from the mains supply and an audible or/and visual warning when a potential overload condition arises so that the user can chose to switch off an appliance manually or refrain from switching on an appliance or in order to prevent the control system operating automatically.
- control system is adapted, in the event that the cooker or one of the sockets is rendered inoperative whilst it is in use as a result of an overload condition being detected, to maintain the cooker or socket inoperable until such time a manually operable reset button is operated by the user.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00976174A EP1232553A1 (en) | 1999-11-17 | 2000-11-17 | Electrical control system |
CA002391615A CA2391615A1 (en) | 1999-11-17 | 2000-11-17 | Electrical control system |
AU14054/01A AU776449B2 (en) | 1999-11-17 | 2000-11-17 | Electrical control system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9927142.1 | 1999-11-17 | ||
GBGB9927142.1A GB9927142D0 (en) | 1999-11-17 | 1999-11-17 | Electrical control system |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001037392A1 true WO2001037392A1 (en) | 2001-05-25 |
Family
ID=10864643
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2000/004389 WO2001037392A1 (en) | 1999-11-17 | 2000-11-17 | Electrical control system |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1232553A1 (en) |
AU (1) | AU776449B2 (en) |
CA (1) | CA2391615A1 (en) |
GB (1) | GB9927142D0 (en) |
WO (1) | WO2001037392A1 (en) |
ZA (1) | ZA200204664B (en) |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005096466A1 (en) * | 2004-03-24 | 2005-10-13 | Briggs & Stratton Power Products Group, Llc | Residential load power management system |
US7151329B2 (en) * | 2002-02-25 | 2006-12-19 | General Electric Company | Integrated protection, monitoring, and control system |
EP1898292A1 (en) * | 2006-09-08 | 2008-03-12 | Eurosei S.r.l. | Apparatus and method for a global management of electrical power in an electric network |
US7356384B2 (en) | 2004-07-15 | 2008-04-08 | Briggs & Stratton Corporation | Load management system |
WO2010013265A1 (en) * | 2008-07-30 | 2010-02-04 | Truentum S.R.L. | A plant for low-power preferably single-phase electrical supply to buildings for residential and non-residential use. |
US7747356B2 (en) | 2002-02-25 | 2010-06-29 | General Electric Company | Integrated protection, monitoring, and control system |
WO2011088352A2 (en) * | 2010-01-18 | 2011-07-21 | Generac Power Systems, Inc. | Load control module for a generator and method of operation |
GB2483303A (en) * | 2010-09-06 | 2012-03-07 | Sony Corp | Managing electrical energy consumption of grouped devices |
EP2800223A3 (en) * | 2009-09-09 | 2014-12-03 | Panasonic Corporation | Power control system |
EP2889632A1 (en) * | 2013-12-30 | 2015-07-01 | Witikee SRL | Apparatus to disconnect and restore a secondary electric power network |
US9088180B2 (en) | 2012-04-17 | 2015-07-21 | Generac Power Systems, Inc. | Load shed control module for use with electrical generator |
WO2016007452A1 (en) * | 2014-07-11 | 2016-01-14 | Microsoft Technology Licensing, Llc | Power management |
ITUB20153381A1 (en) * | 2015-09-03 | 2017-03-03 | Dti S R L | APPARATUS AND METHOD OF CONTROL AND MANAGEMENT OF UTILITIES |
US9979337B2 (en) | 2014-04-24 | 2018-05-22 | Generac Power Systems, Inc. | Method of loadshedding for a variable speed, constant frequency generator |
US10193381B2 (en) | 2016-09-27 | 2019-01-29 | Reliance Controls Corporation | Load management and switching devices and methods |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0045286A2 (en) * | 1980-07-29 | 1982-02-03 | Bruno Basini | Electronic indicator of absorbed current, expressed as a percentage of a prefixed limit, the exceeding of which activates an acoustic alarm |
US4324987A (en) * | 1978-05-26 | 1982-04-13 | Cyborex Laboratories, Inc. | System and method for optimizing shed/restore operations for electrical loads |
US4471232A (en) * | 1980-09-01 | 1984-09-11 | South Eastern Electricity Board | Method of and apparatus for controlling loads on an electrical power supply |
US5436510A (en) * | 1992-07-03 | 1995-07-25 | Euro Cp S.A.R.L. | Method and a system for globally managing electric power in a network within a dwelling or the like |
EP0750383A1 (en) * | 1995-06-20 | 1996-12-27 | Arnaldo Spena | Automatic user load selection and reset in a "total electric power load management system" |
-
1999
- 1999-11-17 GB GBGB9927142.1A patent/GB9927142D0/en not_active Ceased
-
2000
- 2000-11-17 EP EP00976174A patent/EP1232553A1/en not_active Withdrawn
- 2000-11-17 WO PCT/GB2000/004389 patent/WO2001037392A1/en not_active Application Discontinuation
- 2000-11-17 AU AU14054/01A patent/AU776449B2/en not_active Ceased
- 2000-11-17 CA CA002391615A patent/CA2391615A1/en not_active Abandoned
-
2002
- 2002-06-11 ZA ZA200204664A patent/ZA200204664B/en unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4324987A (en) * | 1978-05-26 | 1982-04-13 | Cyborex Laboratories, Inc. | System and method for optimizing shed/restore operations for electrical loads |
EP0045286A2 (en) * | 1980-07-29 | 1982-02-03 | Bruno Basini | Electronic indicator of absorbed current, expressed as a percentage of a prefixed limit, the exceeding of which activates an acoustic alarm |
US4471232A (en) * | 1980-09-01 | 1984-09-11 | South Eastern Electricity Board | Method of and apparatus for controlling loads on an electrical power supply |
US5436510A (en) * | 1992-07-03 | 1995-07-25 | Euro Cp S.A.R.L. | Method and a system for globally managing electric power in a network within a dwelling or the like |
EP0750383A1 (en) * | 1995-06-20 | 1996-12-27 | Arnaldo Spena | Automatic user load selection and reset in a "total electric power load management system" |
Non-Patent Citations (1)
Title |
---|
DELAPLACE J -M: "AVERTISSEUR DE SURINTENSITé", ELECTRONIQUE RADIO PLANS,FR,SPE, PARIS, no. 559, 1 June 1994 (1994-06-01), pages 7 - 9, XP000454485, ISSN: 1144-5742 * |
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7151329B2 (en) * | 2002-02-25 | 2006-12-19 | General Electric Company | Integrated protection, monitoring, and control system |
US7747356B2 (en) | 2002-02-25 | 2010-06-29 | General Electric Company | Integrated protection, monitoring, and control system |
WO2005096466A1 (en) * | 2004-03-24 | 2005-10-13 | Briggs & Stratton Power Products Group, Llc | Residential load power management system |
US7356384B2 (en) | 2004-07-15 | 2008-04-08 | Briggs & Stratton Corporation | Load management system |
EP1898292A1 (en) * | 2006-09-08 | 2008-03-12 | Eurosei S.r.l. | Apparatus and method for a global management of electrical power in an electric network |
WO2010013265A1 (en) * | 2008-07-30 | 2010-02-04 | Truentum S.R.L. | A plant for low-power preferably single-phase electrical supply to buildings for residential and non-residential use. |
EP2800223A3 (en) * | 2009-09-09 | 2014-12-03 | Panasonic Corporation | Power control system |
US8736103B2 (en) | 2010-01-18 | 2014-05-27 | Generac Power Systems, Inc. | Load control module for a generator and method of operation |
US8350405B2 (en) | 2010-01-18 | 2013-01-08 | Generac Power Systems, Inc. | Load control module for a generator and method of operation |
WO2011088352A3 (en) * | 2010-01-18 | 2011-09-15 | Generac Power Systems, Inc. | Load control module for a generator and method of operation |
US8841797B2 (en) | 2010-01-18 | 2014-09-23 | Generac Power Systems, Inc. | Wireless annunciator for an electrical generator |
WO2011088352A2 (en) * | 2010-01-18 | 2011-07-21 | Generac Power Systems, Inc. | Load control module for a generator and method of operation |
US8914159B2 (en) | 2010-09-06 | 2014-12-16 | Sony Corporation | Apparatus and method for controlling power |
GB2483303A (en) * | 2010-09-06 | 2012-03-07 | Sony Corp | Managing electrical energy consumption of grouped devices |
US9088180B2 (en) | 2012-04-17 | 2015-07-21 | Generac Power Systems, Inc. | Load shed control module for use with electrical generator |
EP2889632A1 (en) * | 2013-12-30 | 2015-07-01 | Witikee SRL | Apparatus to disconnect and restore a secondary electric power network |
ITUD20130177A1 (en) * | 2013-12-30 | 2015-07-01 | Witikee S R L | DISCONNECTION AND RESET EQUIPMENT FOR A SECONDARY ELECTRIC POWER SUPPLY NETWORK |
US9979337B2 (en) | 2014-04-24 | 2018-05-22 | Generac Power Systems, Inc. | Method of loadshedding for a variable speed, constant frequency generator |
WO2016007452A1 (en) * | 2014-07-11 | 2016-01-14 | Microsoft Technology Licensing, Llc | Power management |
ITUB20153381A1 (en) * | 2015-09-03 | 2017-03-03 | Dti S R L | APPARATUS AND METHOD OF CONTROL AND MANAGEMENT OF UTILITIES |
US10193381B2 (en) | 2016-09-27 | 2019-01-29 | Reliance Controls Corporation | Load management and switching devices and methods |
Also Published As
Publication number | Publication date |
---|---|
AU1405401A (en) | 2001-05-30 |
ZA200204664B (en) | 2003-03-14 |
AU776449B2 (en) | 2004-09-09 |
CA2391615A1 (en) | 2001-05-25 |
GB9927142D0 (en) | 2000-01-12 |
EP1232553A1 (en) | 2002-08-21 |
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