EP0771518B1 - Leistungssteuerungssystem - Google Patents
Leistungssteuerungssystem Download PDFInfo
- Publication number
- EP0771518B1 EP0771518B1 EP95925944A EP95925944A EP0771518B1 EP 0771518 B1 EP0771518 B1 EP 0771518B1 EP 95925944 A EP95925944 A EP 95925944A EP 95925944 A EP95925944 A EP 95925944A EP 0771518 B1 EP0771518 B1 EP 0771518B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- winding
- terminal
- monitoring
- voltage
- switching means
- 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.)
- Expired - Lifetime
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/36—Controlling
- H05B41/38—Controlling the intensity of light
- H05B41/40—Controlling the intensity of light discontinuously
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
- G05F1/14—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using tap transformers or tap changing inductors as final control devices
Definitions
- the present invention relates to an electrical power control circuit and more particularly to an electrical power control circuit for electrical lighting systems, for example fluorescent lighting systems in large commercial buildings.
- a known power control system for providing a reduced voltage to fluorescent lamps in an electrical lighting arrangement is summarized in the pre-characterising portion of claim 7 and is disclosed in WO-A-88/03353.
- a transformer provides a reduced voltage which can be supplemented by a further transformer up to a normal mains voltage for the purpose of enabling the fluorescent lamps to strike. The further transformer is then disabled so that the reduced voltage is again applied for running the lighting system thereby reducing power consumption.
- any voltage reduction should not result is a perceptibly dimmer light output.
- Another known power control system for providing a reduced voltage to fluorescent lamps in an electrical lighting system involves the use of a plurality of switchable transformers which at start up are switched out so that a normal mains voltage is applied directly to the lighting. Then, they are switched in to provide the reduced lighting.
- a power surge generated when disconnecting the transformer if it is operating.
- a 10 KVA transformer for a bank of up to 200 lamps could generate a surge of 400 amps when switched in this way
- the switching contacts would rapidly degrade leading to un-reliability.
- these type of systems have not been used due to their failure rate.
- a method of controlling an electrical power system for providing one of a plurality of selected voltages to a load comprising the steps of:-
- the present invention can provide a number of different output voltages at the output terminal according to demand. Furthermore, when a fault condition is monitored, a failsafe condition is provided wherein the effect of the winding is taken out of circuit in a safe way by disconnecting the winding from the neutral terminal and preventing turns of the winding being open circuit. Accordingly, damage to the winding and circuitry of the system in general is avoided.
- step (c) comprises disabling the terminal connection means to electrically disconnect said other end of said winding from the neutral terminal and enabling a switching means to electrically connect to the neutral terminal to exclude the predetermined number of turns of said winding located from said other end of the winding.
- step (e) comprises disabling said terminal connection means and said switching means and enabling a further switching means to electrically short-circuit said other end of said winding to said predetermined position.
- the winding can be disconnected from the neutral terminal in a safe and effective manner whilst preventing turns of the winding from being open circuit.
- the method further comprises the step of monitoring for an increased load demand and stopping step (c) in response to a predetermined load demand.
- the method further comprises the step of monitoring the voltage to said one end of the winding and stopping step (c) in response to the voltage falling below a predetermined value.
- the method further comprises the step of supplying said request for another selected voltage after the lapse of a predetermined time interval following supply of power being required.
- an electrical power control system for providing one of a plurality of selected voltages to a load, the electrical power control system comprising:-
- said switching means is connected to the neutral terminal to exclude the predetermined number of turns of said winding from said other end of the winding.
- said monitoring means in response to monitoring of a fault condition, disables said terminal connection means and said switching means to electrically disconnect said other end of the winding from the neutral terminal and enables said further switching means.
- said monitoring means further comprises a current demand sensing means for sensing for transient current changes in the current demand by the load; wherein said monitoring means disables said switching means in response to transient changes in current above a predetermined level.
- said monitoring means further comprises a current overload monitoring means for monitoring current to the winding; wherein said monitoring means disables said terminal connection means and said switching means to electrically disconnect said other end of the winding from the neutral terminal and enables said further switching means in response to a monitored current above a predetermined maximum level.
- said monitoring means further comprises a voltage monitoring means for monitoring voltage to said one end of the winding; and wherein said monitoring means disables said switching means in response to a voltage below a predetermined minimum.
- said monitoring means further comprises timer means for measuring the time starting from a supply of said a selected voltage; wherein said monitoring means enables said switching means when said measured time exceeds a predetermined time interval.
- said timer means monitors a further time starting from supply of said selected voltage; wherein said monitoring means enables said switching means only when said further time exceeds a further predetermined time interval during which the voltage to said one end of said winding has not fallen below said predetermined minimum.
- timer means is reset whenever the switching means is disabled or said further switching means is enabled.
- terminal connection means, the switching means and the further switching means comprise relay contacts.
- system further comprises a zero crossing detector so that movement of the relay contacts can take place at zero crossing points.
- a positive rail 1 has a positive terminal L for connection to a source of electrical power (not shown) and a neutral rail 2 has a neutral terminal N for connection to the source of electrical power.
- a transformer winding 3 has a positive end 13 connected to the positive rail 1 and a neutral end 14 connected both to a terminal connection 4 and a terminal 15.
- the terminal connection 4 can be electrically connected to a terminal 5, which is connected to the rail 2, by means of a relay contact 200A and the terminal 15 can be electrically connected to a terminal 7 by means of a relay contact 300A.
- a terminal 17 is connected.
- the terminal 17 can be electrically connected to the terminal 5 by means of a relay contact 100A.
- the relay contacts 100A, 200A, and 300A are all normally open contacts. This is shown in figure 1. Only when their respective coils 100, 200 and 300 (described hereinafter) are energised, are the electrical connections made.
- the transformer winding 3 is tapped at a predetermined point 18 which is connected to an output terminal T.
- the transformer winding 3 has 126 turns between point 16 and the neutral end 14, 126 turns between the point 16 and tapping point 18, and 14 turns between the tapping point 18 and the positive end 13. It will be apparent therefore that by suitable operation of the relay contacts 100A and 200A, either the connection of the neutral end 14 to the neutral rail 2 via terminal 5 or the connection of the point 16 to the neutral rail 2 via terminal 17 and 5 can take place so that one of two selected reduced voltages can appear at terminal T.
- the relay contact 300A is operated to short circuit the turns of the winding between point 18 and the neutral end 14 so that these are not able to be open circuit which would be detrimental to the condition of the transformer winding 3.
- a sub-circuit of a monitoring means control circuit is connected between the rails 1 and 2.
- This sub-circuit comprises a fuse 10 having one end connected to the rail 1 and the other end connected to a terminal point of a normally open relay contact 600A.
- the relay contact 600A can make an electrical connection to a terminal point which is connected to one side of a heat sensor 12.
- the other side of the heat sensor 12 is connected both to a coil 800 and to a terminal point of a normally closed relay contact 300B.
- the relay contact 300B can make an electrical connection to a terminal point which is connected to a terminal point of a relay 500A contained with a box generally identified by reference numeral 51.
- the relay contact 500A can make an electrical connection either to a terminal point connected to the coil 100, which is connected to the rail 2, or to both a lamp Am (Amber), which is connected to the rail 2, and a terminal point connected to the coil 200, which is connected to the rail 2.
- a red lamp Rd is also connected from a point between fuse 10 and relay contact 600A, and the rail 2.
- Another sub-circuit of the monitoring means control circuit is also connected between the rails 1 and 2.
- This sub-circuit comprises a fuse 20 having one end connected to the rail 1 and the other end connected to a terminal point of a normally closed relay contact 100B.
- the relay contact 100B can make an electrical connection to a terminal point which is connected to a terminal point of another relay contact 200B.
- the relay contact 200B can make electrical contact with a terminal point which is connected to a fault condition unit.
- the fault condition unit comprises a DC power supply which provides a 12 volt supply to one terminal of a normally open relay contact 800B.
- the relay contact 800B can make an electrical connection to a coil 900 which is connected to the rail 2.
- Another 12 volt supply is connected to one terminal of a normally open relay contact 700A.
- the relay contact 700A can make electrical connection to the coil 300 which is connected to the rail 2.
- a further 12 volt supply is connected to a terminal of a normally closed relay contact 800A and a terminal of a normally open relay contact 900A.
- the relay contacts 800A and 900A can make electrical connection to one terminal of a manual reset switch 20.
- the other terminal of the manual reset switch 20 is connected to a coil 700 which is connected to the rail 2.
- a current sensor 21 in the form of a toroid is wound around the rail 1.
- the output of the sensor 21 is connected to a first sub-circuit generally identified by reference number 52 and shown in detail in figure 4.
- the output of sensor 21 is connected to a conversion network 24.
- the network converts the current signal from sensor 21 and provides an output comprising a voltage which is proportional to the current flowing along the rail 1.
- the voltage output from the network 24 is connected to a step sensor 22 and a level sensor 23.
- the step sensor 22 detects the rise in level of the input value from the network 24 against the preceding input value. In this way, it is possible to detect when the load connected to terminal T varies so that an increased voltage may be required, for example in the case of fluorescent lighting, the variation in load implies switching on of lighting.
- a null circuit can be included which effectively stops the sensing for a brief period of time during switching of, say, relay contact 500A.
- step sensor 22 detects an increase in current
- a signal is sent to short timer 25 which is reset and started.
- the output of short timer 25 is sent to gate logic 26 for controlling a switch 27 to enable or disable the coil 500.
- the level sensor 23 detects an initial current level and outputs a signal to a gate 28 for controlling a switch 29 to enable or disable the coil 600. In the event that the current level exceeds a predetermined maximum, the level sensor 23 outputs a signal to the gate logic 26.
- a voltage sensor 30 detects the voltage on the positive rail 1 via a wipe located on the relay contact 600A. When the voltage drops below a certain level, a signal is sent to gate logic 26 and also to a long timer 31 which is reset and started. The output of the long timer is sent to the gate logic 26.
- Figure 1 illustrates the initial position when power is first supplied to terminals L and N.
- an initial current flow occurs along rail 1 and through some turns of the winding 3 of the transformer to the output terminal T since the relay contacts 100A, 200A and 300A are in their normally open position, but those turns do not offer any significant impedance for such a short amount of time.
- lamp Rd is lit via fuse 10 showing not only the presence of a supply voltage, but that fuse 10 has not blown.
- the current sensor 21 senses this flow of current.
- the level sensor 23 outputs a signal to gate 28 along line 40.
- the logic of gate 28 provides a signal to switch 29 so that coil 600 is supplied with current so as to energise the coil and hence close relay contact 600A.
- coil 800 Since coil 800 is now carrying current, the relay contact 800B closes and the relay contact 800A opens. However, current will not flow for long through fuse 20 because with the energisation of the coil 200, the relay contact 200B opens. It will be appreciated that coils 700 and 900 are designed to be slow to operate in response to energisation (say 100 ms) so that the reaction of their respective relays does not take place before the relay contact 200B opens. Thus, there is no risk that coil 300 may become energised to close relay contact 300A. The above situation is shown in figure 2.
- the current sensor 21 senses the initial flow of current through rail 1.
- the step sensor 22 detects a step in the current and outputs a signal to short timer 25 and a signal to gate logic 26 along line 41.
- the gate logic 26 By means of the gate logic 26, the presence of a signal on line 41 inhibits switch 27 from energising coil 500, which remains in its initial position.
- the step sensor has detected the initial flow of current for a predetermined time, no further step is detected and hence the signal on line 41 disappears.
- the voltage sensor 30 senses a voltage above a predetermined minimum level and outputs a signal to the long timer 31 and to the gate logic 26 along line 42.
- the gate logic 26 will not operate to turn on switch 27 if there is a signal on line 41 indicating a step in current demand or if there is no signal on line 42 which indicates insufficient voltage or if both the short timer 25 and long timer 31 have timed out and output signals on their respective lines 43 and 44.
- relay contact 200B now closes and relay contact 100A opens, there remains no current flow through the circuit incorporating these relay contacts.
- the circuit of this embodiment incorporates fault monitoring so as to provide a number of safety features.
- the present embodiment can provide a failsafe condition in the event of failure of the relay contact operating coils, general overloading of the system, a fault external to the system creating an overload condition, a fault in the winding causing a thermal build up and operating the heat sensor 12, a fault causing the fuse 10 to blow, a disconnection in the sub circuit wiring causing the relay contacts 100A or 200A to release, and any failure which causes the winding to go open circuit.
- the latter three relay contacts closing provides for a flow of current which energises coil 700 via manual reset switch 20.
- the coil 700 causes the relay contact 700A to close which provides a flow of current through coil 300.
- the relay contact 300A closes to connect terminals 15 and 7 thereby putting a short circuit across the primary turns of the winding 3 between points 18 and 14. Consequently, the magnetic field is collapsed so that the winding 3 ceases to operate as a transformer and offers substantially no impedance between points 13 and 18.
- closing relay contact 300A has the effect that the electrical power supply system of the present invention is bypassed.
- damage to the winding 3 that could otherwise occur from being open circuit is avoided so that a failsafe condition can be provided.
- the situation of leaving such an open circuit should be considered. If an open circuit occurs for any length of time, there will be a voltage drop between points 13 and 16, in the present case 24 volts, so that the electrical power supply system of the present invention is not bypassed and hence a true failsafe condition is not provided.
- there will be a reversing energisation of the winding which will lead to an unpleasant and disturbing vibration in the form of a hum or buzz.
- the winding will eventually reach a saturation voltage across the open circuit part of the winding.
- This saturation voltage can reach quite high values, in the present case of the order of 760 volts, which is not only potentially very dangerous to anyone who should accidentally touch the system but can also produce sparking due to breakdown of the insulation thereby producing a winding insulation failure.
- relay contact 300B opens relay contact 300B so that electrical operation of coils 100 and 200 and their respective relay contacts is inhibited. If the current flowing along rail 1 drops again, the signal along line 45 disappears and gate 28 turns switch 29 back on so that coil 600 is again energised.
- the sub-circuit shown in figure 4 is arranged such that the relay contact 200A closes when current flows again along rail 1. This can be achieved by making sure that long timer 31 is reset, say by interrupting the voltage sensing of voltage sensor 30. In this respect, it will be noted that regardless of the current flow, if the voltage on rail 1 drops below the predetermined level, long timer 31 is reset so that relay contact 500A automatically returns to the position connected to coil 200.
- relay contact 300A is closed with the same effects as above.
- relay contact 800A opens breaking the current path to coil 700. This results in its relay contact 700A opening so that current no longer flows to coil 300. The effect of this is for its relay contact 300B to close to again provide current to energise coil 100 or 200. It will be appreciated that although relay contact 800B is closed, coil 900 is slow to operate so that relay contact 900A does not operate in time to provide an alternative current path to coil 700. Thus, the system is restarted.
- relay contacts 100A or 200A should open due to mechanical or electrical failure.
- contact 800B is closed due to current flowing through coil 800
- coil 900 is not provided with current because either relay contact 100A or 200B is open.
- that open relay contact will close so that current is now supplied to coil 900.
- relay contact 900A will close so that current is supplied to coil 700 via manual switch 20 which eventually causes relay contact 300A to operate as above. It should be noted that this locks the system so that physical inspection of the system is required. However, power will still be supplied to the load connected to terminal T.
- relay contact 300A whilst relay contacts 100A or 200A are actuated is prevented not only electrically, but also mechanically by interlocking the contacts so that relay contact 300A is positioned between the relay contact 100A and 200A so that operation of either of them inhibits operation of relay contact 300A and operation of relay contact 300A inhibits relay contact 100A and 200A.
- the system can be returned to normal running by actuation of the reset switch 20 which breaks the current supply to coil 700 which will then break the supply of current to coil 300 so that relay contact 300A opens and either relay contact 100A or 200A closes.
- Figure 5 illustrates a second embodiment of the present invention wherein common components with the first embodiment bear common reference numerals.
- the relay contact 200B is now connected to one terminal of a normally open relay contact 1000A and to a coil 1000 which is connected to the rail 2.
- the relay contact 1000A can make electrical connection to one terminal of the relay contact 800B, to one terminal of the normally open relay contact 700A, to one terminal of the normally closed relay contact 800A, and to one terminal of the normally open relay contact 900A.
- the remaining connections are common to figure 1.
- a green lamp Gr is connected across the coil 100 and a blue lamp is connected across the coil 300.
- relay contact 1000A closes to supply current to the fault condition unit so that it can operate as described above.
- relay contact 200A can be left connected whilst relay contact 100A connects.
- relay contacts 100A and 200A are provided to enable the supply of two selected voltages at terminal T, further relay contacts can be provided to enable the supply of more than two selected voltages.
- the embodiments described are fully automated with automatic reset and constant sensing for faults.
- the present embodiment describes the switching from the relay contact 100A to the relay contact 200A in the circumstances of when power demand occurs when switching a load connected to terminal T, when a low incoming voltage occurs, when any failure in the sub circuit of figure 4 occurs or when any circuit fault creating current fluctuation in excess of a predetermined level, costs can be saved by incorporating fewer responses to these circumstances.
- some of these aspects can be omitted to save costs, say the short and long timer can be replaced by a simple time delay relay to switch relay contact 500A.
- the voltage sensor and step sensors shown in figure 4 can be omitted.
- relay contact 500A in box 51 is shown as a relay contact which can be operated by a coil. It will be appreciated that control of the operation of the relay contact within box 51 can take many forms. For example, it can be dependent on a complex of timers, for example as shown in figure 4, or it can be dependent on a time delay relay. The latter is particularly appropriate for the control of loads having just one or two units, such as street lighting.
- the current sensor 21 is located on the rail 1, it will be appreciated that the current sensor could be located on the rail connected to terminal T.
- the present embodiment provides a system which can output a voltage which can be switched between a level approximating to mains voltage (or a chosen voltage) and a fully reduced level at switch on of the load, and to a reduced voltage value which does not produce a noticeable drop in effect on the load, say illumination of lighting, but which provides a substantial improvement in economy whilst all the time providing a secure and reliable failsafe condition in the event of a fault thereby enhancing the safety of the system and ensuring that the system complies with various legal requirements.
Claims (17)
- Verfahren zum Steuern eines elektrischen Leistungssystems zur Bereitstellung einer gewählten Spannung aus einer Mehrzahl von wählbaren Spannungen für einen Verbraucher, wobei das Verfahren die folgenden Schritte aufweist:(a) elektrisches Verbinden eines Endes einer Wicklung (3) mit dem positiven Anschluß (L) einer elektrischen Energiequelle, wobei die Wicklung an einer vorbestimmten Position (18) zur Versorgung eines Ausgangsanschlusses (T) mit einer gewählten Spannung abgegriffen wird;(b) Aktivieren einer Anschlußverbindungseinrichtung (200A) zum elektrischen Verbinden des anderen Endes (14) der Wicklung mit einem neutralen Anschluß (N) der elektrischen Energiequelle in Abhängigkeit der erforderlichen Leistungsversorgung;c) Ausnehmen einer vorbestimmten Anzahl von Windungen der Wicklung in Abhängigkeit einer Anforderung einer anderen gewählten Spannung;d) Überwachen wenigstens einer Fehlerzustandsart; unde) elektrisches Trennen der Wicklung von dem neutralen Anschluß und elektrisches Kurzschließen des anderen Endes der Wicklung in der vorbestimmten Position, wenn bei der Überwachung ein Fehlerzustand festgestellt wird.
- Verfahren nach Anspruch 1, bei dem der Schritt (c) aufweist, daß die Anschlußverbindungseinrichtung desaktiviert wird, um das andere Ende der Wicklung von dem neutralen Anschluß elektrisch abzukoppeln und eine Schalteinrichtung (100A) aktiviert wird, um elektrisch den neutralen Anschluß in Verbindungszustand zu bringen und eine vorbestimmte Anzahl von Windungen der Wicklung von dem anderen Ende der Wicklung auszunehmen.
- Verfahren nach Anspruch 2, bei dem der Schritt (e) aufweist, daß die Anschlußverbindungseinrichtung und die Schalteinrichtung desaktiviert werden und eine weitere Schalteinrichtung (300A) aktiviert wird, um das andere Ende der Wicklung in der vorbestimmten Position elektrisch kurzzuschließen.
- Verfahren nach einem der vorangehenden Ansprüche, welches ferner den Schritt aufweist, gemäß dem eine größer werdende Verbraucheranforderung und der Anhalteschritt (c) in Abhängigkeit von einer vorbestimmten Verbraucheranforderung überwacht werden.
- Verfahren nach einem der vorangehenden Ansprüche, welches ferner aufweist, daß der Schritt zum Überwachen der Spannung an einem Ende der Wicklung und der Anhalteschritt (c) in Abhängigkeit davon erfolgt, daß die Spannung unter einen vorbestimmten Wert abfällt.
- Verfahren nach einem der vorangehenden Ansprüche, welches ferner den Schritt aufweist, gemäß dem die geforderte weitere ausgewählte Spannung angelegt wird, nachdem ein vorbestimmtes Zeitintervall im Anschluß an die erforderliche Energieversorgung verstrichen ist.
- Elektrisches Leistungssteuersystem zum Bereitstellen einer Mehrzahl von ausgewählten Spannungen für einen Verbraucher, wobei das elektrische Leistungssteuersystem folgendes aufweist:einen positiven und neutralen Anschluß (L, N) zum Verbinden mit einer elektrischen Energiequelle;einen Ausgangsanschluß (T) zum Versorgen eines Verbrauchers mit einer Mehrzahl von wählbaren Spannungen;eine Wicklung (3), welche ein Ende (13) hat, welches elektrisch mit dem positiven Anschluß verbunden ist, und die an einer vorbestimmten Position (18) zur Versorgung des Ausgangsanschlusses (T) mit der gewünschten Spannung abgegriffen wird, gekennzeichnet durch:eine Anschlußverbindungseinrichtung (200A), welche aktiviert werden kann, um das andere Ende (14) der Wicklung mit dem neutralen Anschluß elektrisch zu verbinden;eine Schalteinrichtung (100A), welche eine Aktivierung gestattet, um eine vorbestimmte Anzahl von Windungen der Wicklung in Abhängigkeit von einer Anforderung einer anderen gewählten Spannung auszunehmen;eine Überwachungseinrichtung zum Überwachen wenigstens einer Fehlerzustandsart; undeine weitere Schalteinrichtung (300A), welche aktiviert werden kann, um das andere Ende der Wicklung mit der vorbestimmten Position elektrisch kurzzuschließen, wenn bei der Überwachung ein Fehlerzustand erkannt wird.
- System nach Anspruch 7, bei dem die Schalteinrichtung (100A) mit dem neutralen Anschluß (N) verbunden ist, um die vorbestimmte Anzahl von Wicklungen der Windung ausgehend von dem anderen Ende der Wicklung auszunehmen.
- System nach Anspruch 8, bei dem in Abhängigkeit von der Überwachung eines Fehlerzustands die Überwachungseinrichtung die Anschlußverbindungseinrichtung (200A) desaktiviert, die Schalteinrichtung (100A) das andere Ende der Wicklung von dem neutralen Anschluß elektrisch abkoppelt und die weitere Schalteinrichtung (300A) aktiviert.
- System nach einem der Ansprüche 7 bis 9, bei dem die Überwachungseinrichtung ferner eine Stromanforderungssensoreinrichtung (21) zum Erfassen von Zwischenstromänderungen bei der Stromanforderung durch den Verbraucher aufweist, und bei dem die Überwachungseinrichtung die Schalteinrichtung in Abhängigkeit von den Zwischenstromänderungen oberhalb eines vorbestimmten Pegels desaktiviert.
- System nach einem der Ansprüche 7 bis 10, bei dem die Überwachungseinrichtung ferner eine Stromüberlastungs-Überwachungseinrichtung zum Überwachen des an die Wicklung angelegten Stromes aufweist, wobei die Überwachungseinrichtung die Anschlußverbindungseinrichtung und die Schalteinrichtung desaktiviert, um das andere Ende der Wicklung von dem neutralen Anschluß elektrisch abzukoppeln und die weitere Schalteinrichtung in Abhängigkeit von einem überwachten Strom oberhalb eines vorbestimmten maximalen Wertes zu aktivieren.
- System nach einem der Ansprüche 7 bis 11, bei dem die Überwachungseinrichtung ferner eine Spannungsüberwachungseinrichtung (30) zum Überwachen der Spannung an einem Ende der Wicklung aufweist, und bei dem die Überwachungseinrichtung die Schalteinrichtung in Abhängigkeit von einer Spannung unterhalb eines vorbestimmten minimalen Wertes desaktiviert.
- System nach einem der Ansprüche 7 bis 12, bei dem die Überwachungseinrichtung ferner eine Zeitgebereinrichtung (25, 31) zum Messen der Zeit ausgehend von einem Anlegen einer gewünschten Spannung aufweist, und bei dem die Überwachungseinrichtung die Schalteinrichtung aktiviert, wenn die gemessene Zeit ein vorbestimmtes Zeitintervall überschreitet.
- System nach Anspruch 12 und 13, bei dem die Zeitgebereinrichtung eine weitere Zeit ausgehend von einem Anlegen einer ausgewählten Spannung überwacht, und bei dem die Überwachungseinrichtung die Schalteinrichtung nur dann aktiviert, wenn diese weitere Zeit ein vorbestimmtes Zeitintervall überschreitet, währenddem die Spannung an dem einen Ende der Wicklung nicht unter den vorbestimmten minimalen Wert abgefallen ist.
- System nach Anspruch 13 oder 14, bei dem die Zeitgebereinrichtung jedes mal dann zurückgesetzt wird, wenn die Schalteinrichtung desaktiviert wird oder wenn die weitere Schalteinrichtung aktiviert wird.
- System nach einem der Ansprüche 7 bis 15, bei dem die Anschlußverbindungseinrichtung, die Schalteinrichtung und die weitere Schalteinrichtung Relaiskontakte aufweisen.
- System nach Anspruch 1 in Abhängigkeit von einem der Ansprüche 10 bis 15, welches ferner einen Nulldurchgangsdetektor aufweist, so daß die Bewegung der Relaiskontakte an den optimalen Punkten während des Zyklus erfolgen kann.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9414665A GB9414665D0 (en) | 1994-07-20 | 1994-07-20 | Improvements in and relating to control systems for electrical circuits |
GB9414665 | 1994-07-20 | ||
GBGB9504282.6A GB9504282D0 (en) | 1994-07-20 | 1995-03-03 | Improvements in and relating to control systems for electrical circuits |
GB9504282 | 1995-03-03 | ||
PCT/GB1995/001729 WO1996003018A1 (en) | 1994-07-20 | 1995-07-20 | Electrical power control system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0771518A1 EP0771518A1 (de) | 1997-05-07 |
EP0771518B1 true EP0771518B1 (de) | 1999-01-20 |
Family
ID=26305306
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95925944A Expired - Lifetime EP0771518B1 (de) | 1994-07-20 | 1995-07-20 | Leistungssteuerungssystem |
Country Status (13)
Country | Link |
---|---|
EP (1) | EP0771518B1 (de) |
JP (1) | JP3746295B2 (de) |
CN (1) | CN1087585C (de) |
AT (1) | ATE176118T1 (de) |
AU (1) | AU700796B2 (de) |
BR (1) | BR9508791A (de) |
CA (1) | CA2226498C (de) |
DE (1) | DE69507484T2 (de) |
ES (1) | ES2129838T3 (de) |
GB (1) | GB2307119B (de) |
HK (1) | HK1011517A1 (de) |
NZ (1) | NZ289906A (de) |
WO (1) | WO1996003018A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9081039B2 (en) | 2012-05-17 | 2015-07-14 | GM Global Technology Operations LLC | Vehicle electrical system fault detection |
FR3070225B1 (fr) * | 2017-08-16 | 2019-09-20 | Aksor | Borne metier automatique |
EP3975362A1 (de) * | 2020-09-24 | 2022-03-30 | Volvo Truck Corporation | Sicherheitsschaltung für ein leistungssystem eines fahrzeugs und verfahren zur steuerung der sicherheitsschaltung |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4189664A (en) * | 1977-10-05 | 1980-02-19 | Hirschfeld Richard L | Power control unit for automatic control of power consumption in a lighting load |
US4201938A (en) * | 1978-10-02 | 1980-05-06 | Siemens-Allis, Inc. | Voltage regulator which eliminates arcing during tap changes |
US4237403A (en) * | 1979-04-16 | 1980-12-02 | Berkleonics, Inc. | Power supply for fluorescent lamp |
US4513224A (en) * | 1982-09-22 | 1985-04-23 | Pacific Power Control, Inc. | Fluorescent-lighting-system voltage controller |
-
1995
- 1995-07-20 DE DE69507484T patent/DE69507484T2/de not_active Expired - Fee Related
- 1995-07-20 GB GB9703695A patent/GB2307119B/en not_active Revoked
- 1995-07-20 CA CA002226498A patent/CA2226498C/en not_active Expired - Fee Related
- 1995-07-20 ES ES95925944T patent/ES2129838T3/es not_active Expired - Lifetime
- 1995-07-20 AU AU29884/95A patent/AU700796B2/en not_active Ceased
- 1995-07-20 JP JP50484196A patent/JP3746295B2/ja not_active Expired - Fee Related
- 1995-07-20 BR BR9508791A patent/BR9508791A/pt not_active IP Right Cessation
- 1995-07-20 WO PCT/GB1995/001729 patent/WO1996003018A1/en active IP Right Grant
- 1995-07-20 AT AT95925944T patent/ATE176118T1/de not_active IP Right Cessation
- 1995-07-20 EP EP95925944A patent/EP0771518B1/de not_active Expired - Lifetime
- 1995-07-20 CN CN95194706A patent/CN1087585C/zh not_active Expired - Fee Related
- 1995-07-20 NZ NZ289906A patent/NZ289906A/xx unknown
-
1998
- 1998-11-14 HK HK98112015A patent/HK1011517A1/xx not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
CN1087585C (zh) | 2002-07-10 |
CN1155967A (zh) | 1997-07-30 |
GB9703695D0 (en) | 1997-04-09 |
CA2226498C (en) | 2003-02-18 |
EP0771518A1 (de) | 1997-05-07 |
CA2226498A1 (en) | 1996-02-01 |
HK1011517A1 (en) | 1999-07-09 |
ES2129838T3 (es) | 1999-06-16 |
BR9508791A (pt) | 1997-12-30 |
GB2307119A (en) | 1997-05-14 |
DE69507484D1 (de) | 1999-03-04 |
ATE176118T1 (de) | 1999-02-15 |
MX9700481A (es) | 1998-10-31 |
NZ289906A (en) | 1998-10-28 |
JPH10504122A (ja) | 1998-04-14 |
AU2988495A (en) | 1996-02-16 |
AU700796B2 (en) | 1999-01-14 |
GB2307119B (en) | 1998-05-27 |
JP3746295B2 (ja) | 2006-02-15 |
DE69507484T2 (de) | 1999-09-02 |
WO1996003018A1 (en) | 1996-02-01 |
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