AU2012327353B2 - Improvement of the motor protection of a DC drive - Google Patents

Improvement of the motor protection of a DC drive Download PDF

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Publication number
AU2012327353B2
AU2012327353B2 AU2012327353A AU2012327353A AU2012327353B2 AU 2012327353 B2 AU2012327353 B2 AU 2012327353B2 AU 2012327353 A AU2012327353 A AU 2012327353A AU 2012327353 A AU2012327353 A AU 2012327353A AU 2012327353 B2 AU2012327353 B2 AU 2012327353B2
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Australia
Prior art keywords
current
rise
measuring device
power supply
supply system
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AU2012327353A
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AU2012327353A1 (en
Inventor
Gerd Ahlf
Michael Morsch
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Siemens AG
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Siemens AG
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/10—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current additionally responsive to some other abnormal electrical conditions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H23/00—Transmitting power from propulsion power plant to propulsive elements
    • B63H23/22—Transmitting power from propulsion power plant to propulsive elements with non-mechanical gearing
    • B63H23/24—Transmitting power from propulsion power plant to propulsive elements with non-mechanical gearing electric
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/44—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to the rate of change of electrical quantities
    • H02H3/445—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to the rate of change of electrical quantities of DC quantities
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/0811—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for dc motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
    • 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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/06—Two-wire systems
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/093—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current with timing means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/001—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection limiting speed of change of electric quantities, e.g. soft switching on or off
    • 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
    • H02J2310/40—The network being an on-board power network, i.e. within a vehicle
    • H02J2310/42—The network being an on-board power network, i.e. within a vehicle for ships or vessels

Abstract

The invention relates to an electrical DC power supply system for underwater and above-water vessels and for offshore installations with at least one DC source (12, 13) arranged in a respective source phase and at least one DC drive motor (2) arranged in a respective motor phase. Furthermore, the invention relates to a method for influencing a direct current flowing in a DC power supply system. In order to ensure improved protection in the event of a short circuit in an electrical DC power supply system, it is proposed to provide in each case at least one current-measuring device (14, 15) for detecting a current and/or current rise at the at least one DC source (12, 13) and at least one controller (4) for influencing a direct current flowing in the respective motor phase of the DC power supply system if the current and/or current rise detected by the at least one current-measuring device (14, 15) is greater than a predeterminable current and/or current rise.

Description

2011P21248WE 12 772 945.7 2012327353 11 Apr 2014 1
Description
Improvement of the motor protection of a DC drive
The invention relates to an electrical direct-current (DC) power supply system for submarine and surface vessels as well as for offshore installations which has at least one DC source arranged in a respective source phase and at least one DC drive motor arranged in a respective motor phase. The invention furthermore relates to a method for influencing a direct current flowing in a DC power supply system.
The use of DC power supply systems or DC power supply installations is widely established in submarine vessels, for example. In particular, total short-circuit currents of approx. 100 kA and more are possible there, which in the event of a short-circuit leads to a considerable dynamic and thermal loading of the entire DC power supply system as a result of high mechanical forces caused by surge currents. In the event of a short-circuit during the propulsion mode of operation, the DC motor will in that case make a transition from the motor-driven to the generator mode of operation. The situation becomes critical if a so-called "commutator flashover" occurs at the DC motor, which can lead to major damage to the DC motor. WO 2010/003835 A2 discloses a high-speed circuit breaker for a high-performance battery in an isolated direct-current network, which high-performance battery is suitable for use in a submarine vessel, for example. The isolated direct-current network has a plurality of battery modules, a DC drive motor and a monitoring and control unit. P106510 / 8545133 4 2011P21248WE 12 772 945.7 2012327353 11 Apr 2014 la A stator for a DC motor is known from JP 03 098480 A, wherein a switch is connected upstream of the DC motor.
The object underlying the invention is to ensure improved protection for an electrical DC power supply system in the event of a short-circuit in the electrical DC power supply system. P106510 / 8545133_4 2011P21248WE 12 772 945.7 2012327353 11 Apr 2014 2
This object is achieved by means of an electrical DC power supply system of the type cited in the introduction, wherein at least one current-measuring device is provided in each case for the purpose of measuring a current and/or current rise at the at least one DC source and at least one controller is provided for the purpose of influencing a direct current flowing in the respective motor phase of the DC power supply system if the current and/or current rise measured by the at least one current-measuring device are/is greater than a predefinable current and/or current rise, wherein at least one starting resistor is connected upstream of the respective DC drive motor in the respective motor phase for the purpose of reducing a starting current, wherein the at least one starting resistor can be bridged by means of at least one circuit breaker connected in parallel with it, and wherein an operative connection exists between the at least one circuit breaker and the at least one controller such that the at least one starting resistor can be connected into the circuit by means of the at least one circuit breaker if the current and/or current rise measured by the at least one currentmeasuring device are/is greater than the predefinable current and/or current rise.
This object is further achieved by means of a method of the type cited in the introduction, wherein the DC power supply system has at least one DC source arranged in a respective source phase and at least one DC drive motor arranged in a respective motor phase, which method comprises the following method steps: P106510 / 8545133_4 2011P21248WE 12 772 945.7 2012327353 11 Apr 2014 2a measuring a current and/or current rise at the at least one DC source by means of at least one current-measuring device in each case, influencing the direct current flowing in the respective motor phase if the current and/or current rise measured by the at least one current-measuring device are/is greater than a predefinable current and/or current rise, connecting at least one starting resistor upstream of the respective DC drive motor in the respective motor phase for the purpose of reducing a starting current during the starting of the at least one DC drive motor, bridging the at least one starting resistor by means of a circuit breaker connected in parallel with it as soon as the at least one DC drive motor has been started and the current and/or current rise measured by means of the at least one current-measuring device are/is less than the predefinable current and/or current rise, connecting the at least one starting resistor upstream of the at least one DC drive motor if the current and/or current rise measured by means of the at least one currentmeasuring device are/is greater than the predefinable current and/or current rise.
If a short-circuit occurs during the propulsion mode of operation, the at least one DC drive motor switches from the motor-driven to the generator mode of operation, with the result that the current direction is reversed and the short-circuit current increases relatively slowly at the at least one DC drive motor owing to a relatively high time constant in the motor circuit. The short-circuit current at the at least one DC source, in contrast, increases very much more quickly and reaches critical current values more P106510 / 8545133 4 2011P21248WE 12 772 945.7 2012327353 11 Apr 2014 2b quickly. By means of the inventive measurement of the current and/or current rise at the at least one DC source it is thus possible in the event of a short-circuit to effect an earlier influencing of the direct current flowing in the respective motor phase of the DC power supply system because the measurement is taken at the point where critical currents are reached quickest. Protection of the DC system, more particularly of the at least one DC motor, is therefore improved substantially as a result of the faster influencing of the respective motor phase of the direct current. In this case the influencing can for example be P106510 / 8545133_4 2011P21248WE 12 772 945.7 2012327353 11 Apr 2014 3 effected in such a way that the direct current flowing in the respective motor phase is limited or switched off.
In addition, measuring the current and/or current rise at the at least one DC source makes detecting a critical current and/or current rise more reliable than in the case of measurement at the at least one DC motor, since dynamic current peaks can occur during the operation of the at least one DC motor. Said current peaks accordingly play a smaller role in the specification of a trip setting for the eventuality of a short-circuit. The critical current value can therefore be chosen with a smaller safety margin and consequently also smaller.
The current rise can be characterized for example by the time derivative of the current. If the time derivative of the current during a specific time is greater than the predefinable value that is considered critical, the direct current is switched off at the instigation of the controller, in particular by means of switches or circuit breakers. Alternatively to the current rise, the absolute value of the flowing direct current can also be used as the criterion for the presence of a short-circuit and the following disconnection of the direct current. It is also possible to detect a critical current rise on the basis that a specific absolute value of the current is reached and at the same time a specific time derivative of the current is present.
The at least one DC source can be implemented for example as a battery system. Furthermore, the at least one DC source can comprise a fuel cell system. The use of a DC generator or a P106510 / 8545133_4 2011P21248WE 12 772 945.7 2012327353 11 Apr 2014 4 plurality of the aforementioned systems and generators is also conceivable .
Starting resistors are often switched on briefly in the case of DC drives in order to reduce the inrush currents into the motor circuits. Once startup has been completed, the starting resistors are then short-circuited in normal operation by means of one or more circuit breakers. As a result of the dynamic disconnection of the at least one circuit breaker upon a current and/or current rise being measured that is greater than the predefinable current and/or current rise, the at least one starting resistor is included in the motor circuit once again, which leads to a reduction in the short-circuit current component generated by the motor in the generator mode of operation. This leads to improved protection for the electrical DC power supply system, since in the event of a short-circuit smaller surge currents will occur, which leads to a reduced dynamic and thermal loading of the DC power P106510 / 8545133_4 2011P21248WE 12 772 945.7 2012327353 11 Apr 2014 5 supply system. The at least one starting resistor therefore leads also in the case of a short-circuit to a limiting of the current and at the same time can dissipate the electrical energy stored for example in inductors in a reliable and controlled manner.
In an advantageous embodiment of the electrical DC power supply system, the direct current flowing in the respective motor phase of the DC power supply system can be switched off by means of at least one first switch and/or by means of at least one second switch.
The switch or switches therefore interrupt the DC power supply system in the respective motor phase. As a result of this interruption the electrical potentials of the respective poles of the at least one DC source and of the at least one DC drive motor are no longer connected to one another. In particular possible leakage currents are avoided or substantially reduced as a result of the complete separation of the potentials of the corresponding poles of the at least one DC source and of the at least one DC drive motor, in particular upon ingress of water in the case of a water vessel. Accordingly, the protection of the electrical DC power supply system in the event of a short-circuit is further improved through the separation of the potentials.
It is of advantage in particular in this case to separate the DC drive motor completely and at the earliest possible stage from other DC loads or DC sources so that a commutator flashover can be avoided or at least will occur with less severity. By virtue of the current rise being measured at the DC source, i.e. P106510 / 8545133_4
2011P21248WE 12 772 945.7 2012327353 11 Apr 2014 5a at the point where the current rises most P106510 / 8545133_4
PCT/EP2012/070406 / 2011P21248WO 6 rapidly in the case of a short-circuit, a particularly early separation of the DC drive motor from the DC power supply system is possible. Measuring a current rise at the DC drive motor would lead to a much later detection of a short-circuit, with the result that possible commutator flashovers will have more serious consequences.
In order to complete the interruption of the respective motor phase as swiftly as possible, the switches can for example be dynamically actuated in such a way that the separation can be effected by means of the switches as a result of the dynamic actuation more quickly than in the normal mode of operation of the switches.
In a further advantageous embodiment of the electrical DC power supply system, the at least one DC source comprises at least one battery system and at least one DC generator, wherein a first current and/or current rise can be measured at the at least one battery system by means of at least one first current-measuring device and a second current and/or current rise can be measured at the at least one DC generator by means of at least one second current-measuring device, and wherein an operative connection exists between the at least one first current-measuring device, the at least one second currentmeasuring device and the at least one controller in such a way that the direct current can be influenced if the measured first current and/or current rise and/or the measured second current and/or current rise are/is greater than the predefinable current and/or current rise.
The use of both at least one battery system and at least one DC generator is a widely established practice in particular in
PCT/EP2012/07 0 4 0 6 / 2011P21248WO 7 the case of submarine vessels. The at least one DC generator is driven for example by means of a diesel motor and accordingly provides electrical energy. Since it must be possible to switch off the diesel motor and at the same time to continue to operate the at least one DC drive motor, at least one battery system is provided which is able to store electrical energy. If the diesel motor is switched off, the at least one battery system can carry on supplying the at least one DC drive motor with energy.
By measuring the first current and/or current rise and the second current and/or current rise it is possible to influence, in particular to disconnect, the direct current particularly quickly, for example as soon as only one of the two measured currents and/or current rises is greater than the predefinable current and/or current rise. Thus, the detection of a short-circuit is based on the measurement of a current and/or current rise at that component of the DC source which reacts most sensitively to a short-circuit. Alternatively, the direct current can be influenced as soon as both measured currents and/or current rises are greater than the predefinable current and/or current rise. A particularly reliable detection of a short-circuit can be ensured by this means. In principle it is also conceivable for the at least one DC source to include further components as well, in which case the respective current and/or current rise at the components of the DC source can be measured by means of a respective current-measuring device and the direct current will be influenced as soon as one, more than one or all of the measured currents and/or current rises is or are greater than the predefinable current and/or current rise.
PCT/EP2012/070406 / 2011P21248WO 8
The invention is described and explained in more detail below with reference to the exemplary embodiments illustrated in the figures, in which: FIG 1 shows an electrical circuit diagram of an embodiment variant of an electrical DC power supply system according to the invention, and FIG 2 shows an exemplary time curve of a battery current, a generator current and a motor current.
Figure 1 shows an electrical circuit diagram of an embodiment variant of an electrical DC power supply system according to the invention. DC drive motors 2 are connected via a first connection 8 and a second connection 10 to battery systems 12 and the DC generators 13, provided that first switches 9, 19, 39 and second switches 11, 21, 41 are closed. Within the respective motor phase, a direct current from the first connection 8 to the respective DC drive motor 2 can be interrupted by means of the respective first switch 9 and a direct current from the second connection 10 to the respective DC drive motor 2 can be interrupted by means of the respective second switch 11. During operation, i.e. when the aforementioned switches 9, 19, 39, 11, 21, 41 are closed, a direct current can flow from the battery systems 12 and the DC generators 13 to the DC drive motors 2, wherein the first connection 8 acts as a bus bar with positive voltage and the second connection 10 acts as a bus bar with negative voltage. When the DC drive motors 2 are started, circuit breakers 7 are open, with the result that the direct current flows via starting resistors 6 and is limited thereby. During normal operation, however, the circuit breakers 7 are closed, which means that the starting resistors 6 are bridged.
PCT/EP2012/070406 / 2011P21248WO 9
Current rises occurring at the battery systems 12 or currents flowing there are measured via respective first currentmeasuring devices 14. Respective second current—measuring devices 15 measure respective current rises at the DC generators 13 or currents flowing there. The current rises or currents determined by the first current-measuring devices 14 and the second current-measuring devices 15 are communicated to at least one controller 4 which compares the transmitted data with a predefinable critical current rise or a predefinable critical current. If the controller 4 determines on the basis of said comparison that a short-circuit is present, it can output control signals such that the first switches 9 and the second switches 11 are opened in order to interrupt the flowing direct current directly at the DC drive motors 2. Measuring the current rises at the battery systems 12 with the aid of the first current-measuring devices 14 and at the DC generators 13 with the aid of the second currentmeasuring devices 15 enables a particularly fast detection of a short-circuit, since that is where the most rapid current rises are to be expected. As a result of this early short-circuit detection, the DC drive motors 2 can be very quickly separated from the rest of the DC power supply system and in this way a commutator flashover can be avoided or at least limited in terms of its repercussions. In the event of a detected short-circuit the controller 4 can furthermore output control signals to the circuit breakers 7, which are then opened in order to limit a possibly flowing direct current by means of the starting resistors 6.
In the event of a short-circuit it can additionally be provided that the controller 4 also sends control signals to
PCT/EP2012/070406 / 2011P21248WO 10 the further first switches 19, 39 and the further second switches 21, 41 which are respectively located between the DC generators 13 and the battery systems 12 on the one side and the first connection 8 and the second connection 10 on the other side. Accordingly, the flowing direct current is also interrupted directly at the battery systems 12 and the DC generators 13. This can also happen at a later time, in respect of the battery systems 12 for example, than the interruption of the direct current by means of the first switches 9, 11.
Although comparatively small currents and current rises are to be expected directly at the DC drive motors 2 in the event of a short-circuit, it is furthermore possible to determine current rises or currents there also by means of further current-measuring devices 30. The acquired data can then likewise be transmitted to the controller 4, which can likewise take said data into account when identifying a short-circuit .
Obviously, the electrical DC power supply system can also consist solely of e.g. the right half of the exemplary embodiment shown in Figure 1 and in that case would have only one DC drive motor 2, one DC generator 13 and only one battery system 12. In this case it is furthermore possible to provide simply just one DC generator 13 or just one battery system 12, without this resulting in disadvantages in respect of an improved overcurrent protection according to the invention.
Figure 2 shows an exemplary time curve of a battery current 16, a generator current 17 and a motor current 18. In this case the time is plotted on the x-axis and the current on the
PCT/EP2012/0 7 0406 / 2011P21248WO 11 y-axis, an assumed short-circuit taking place at time t = 0.
In order to identify the short-circuit it is monitored whether the battery current 16 or the generator current 17 is greater than a critical current 31. Alternatively to an absolute value of a critical current 31, a predefinable current rise, for example in the form of a time derivative of the current, can also serve in this case as a criterion for identifying a short-circuit.
In the event of a short-circuit in the propulsion mode of operation, the motor switches from the motor-driven to the generator mode of operation, i.e. the motor current 18 first changes its polarity and thereafter increases slowly with time. In contrast thereto, the battery current 16 and the generator current 17 abruptly increase immediately after the short-circuit. In this case the battery current reaches a specific limit value relatively rapidly, whereas the generator current executes an oscillation with initially large deflections about a relatively large limit value. The critical current 31 is reached by the battery current 16 or the generator current 17 within a very short time, inside 1 ms in the present example. The motor current 18, on the other hand, reaches the critical current 31 very much later, in 9 ms in the present example.
Accordingly, the monitoring of the battery current 16 and of the generator current 17 permits a very swift detection of a short-circuit, in particular compared to a monitoring of the motor current 18.
To sum up, the invention relates to an electrical DC power supply system for submarine and surface vessels as well as for
2011P21248WE 12 772 945.7 2012327353 11 Apr 2014 12 offshore installations which has at least one DC source arranged in a respective source phase and at least one DC drive motor arranged in a respective motor phase. The invention furthermore relates to a method for influencing a direct current flowing in a DC power supply system. In order to ensure improved protection in the event of a short-circuit in an electrical DC power supply system, it is proposed to provide at least one current-measuring device in each case for the purpose of measuring a current and/or current rise at the at least one DC source and at least one controller for the purpose of influencing a direct current flowing in the respective motor phase of the DC power supply system if the current and/or current rise measured by means of the at least one current-measuring device are/is greater than a predefinable current and/or current rise, wherein at least one starting resistor is connected upstream of the respective DC drive motor in the respective motor phase for the purpose of reducing a starting current, wherein the at least one starting resistor can be bridged by means of at least one circuit breaker connected in parallel with it, and wherein an operative connection exists between the at least one circuit breaker and the at least one controller such that the at least one starting resistor can be connected into the circuit by means of the at least one circuit breaker if the current and/or current rise measured by the at least one currentmeasuring device are/is greater than the predefinable current and/or current rise. P106510 / 8545133_4

Claims (6)

  1. Claims
    1. An electrical DC power supply system for submarine and surface vessels as well as for offshore installations, comprising at least one DC source arranged in a respective source phase, and at least one DC drive motor arranged in a respective motor phase, wherein at least one current-measuring device is provided in each case for the purpose of measuring a current and/or current rise at the at least one DC source, and at least one controller is provided for the purpose of influencing a direct current flowing in the respective motor phase of the DC power supply system if the current and/or current rise measured by the at least one current-measuring device are/is greater than a predefinable current and/or current rise, wherein at least one starting resistor is connected upstream of the respective DC drive motor in the respective motor phase for the purpose of reducing a starting current, wherein the at least one starting resistor can be bridged by means of at least one circuit breaker connected in parallel with it, and wherein an operative connection exists between the at least one circuit breaker and the at least one controller such that the at least one starting resistor can be connected into the circuit by means of the at least one circuit breaker if the current and/or current rise measured by the at least one current-measuring device are/is greater than the predefinable current and/or current rise.
  2. 2. The electrical DC power supply system as claimed in claim 1, wherein the direct current flowing in the respective motor phase of the DC power supply system can be disconnected by means of at least one first switch arranged in the respective motor phase and/or by means of at least one second switch arranged in the respective motor phase.
  3. 3. The electrical DC power supply system as claimed in one of the preceding claims, wherein the at least one DC source comprises at least one battery system and at least one DC generator , wherein a first current and/or current rise at the at least one battery system can be measured by means of at least one first current-measuring device and a second current and/or current rise at the at least one DC generator can be measured by means of at least one second current-measuring device, and wherein an operative connection exists between the at least one first current-measuring device, the at least one second current-measuring device and the at least one controller such that the direct current can be influenced if the measured first current and/or current rise and/or the measured second current and/or current rise are/is greater than the predefinable current and/or current rise.
  4. 4. A method for influencing a direct current flowing in a DC power supply system for submarine and surface vessels as well as for offshore installations, wherein the DC power supply system has at least one DC source arranged in a respective source phase and at least one DC drive motor arranged in a respective motor phase, said method comprising the following method steps: measuring a current and/or current rise at the at least one DC source by means of at least one current-measuring device in each case, influencing the direct current flowing in the respective motor phase if the current and/or current rise measured by the at least one current-measuring device are/is greater than a predefinable current and/or current rise, connecting at least one starting resistor upstream of the respective DC drive motor in the respective motor phase for the purpose of reducing a starting current during the starting of the at least one DC drive motor, bridging the at least one starting resistor by means of a circuit breaker connected in parallel with it as soon as the at least one DC drive motor has been started and the current and/or current rise measured by means of the at least one current-measuring device are/is less than the predefinable current and/or current rise, connecting the at least one starting resistor upstream of the at least one DC drive motor if the current and/or current rise measured by means of the at least one currentmeasuring device are/is greater than the predefinable current and/or current rise.
  5. 5. The method as claimed in claim 4, comprising the following additional method steps if the current and/or current rise measured by the at least one current-measuring device is greater than the predefinable current and/or current rise: disconnecting the direct current flowing in the respective motor phase of the DC power supply system by means of at least one first switch arranged in the respective motor phase and/or by means of at least one second switch arranged in the respective motor phase.
  6. 6. The method as claimed in claims 4 or 5, comprising the following additional method steps: measuring a first current and/or current rise at at least one battery system included in the DC source by means of at least one first current-measuring device, measuring a second current and/or current rise at at least one DC generator included in the DC source by means of at least one second current-measuring device, influencing the direct current if the measured first current and/or current rise and/or the measured second current and/or current rise are/is greater than the predefinable current and/or current rise.
AU2012327353A 2011-10-26 2012-10-15 Improvement of the motor protection of a DC drive Ceased AU2012327353B2 (en)

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DE102011085253A DE102011085253A1 (en) 2011-10-26 2011-10-26 Improvement of the motor protection of a DC drive
DE102011085253.0 2011-10-26
PCT/EP2012/070406 WO2013060591A1 (en) 2011-10-26 2012-10-15 Improvement of the motor protection of a dc drive

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DE (1) DE102011085253A1 (en)
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CN104765939B (en) * 2015-05-04 2017-12-01 上海利驰软件有限公司 Pickup conversion DWG form electric diagram method and devices

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WO2010003835A2 (en) * 2008-07-09 2010-01-14 Siemens Aktiengesellschaft High-speed circuit breaker for a high-performance battery in an isolated direct current network

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JP3098480B2 (en) * 1997-11-14 2000-10-16 日本電気アイシーマイコンシステム株式会社 Power supply circuit
KR19990055633A (en) * 1997-12-27 1999-07-15 김영환 Electric vehicle battery protector and method
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JPH0398480A (en) * 1989-09-08 1991-04-24 Toshiba Corp Starter for dc motor
WO2010003835A2 (en) * 2008-07-09 2010-01-14 Siemens Aktiengesellschaft High-speed circuit breaker for a high-performance battery in an isolated direct current network

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BR112014009730A2 (en) 2017-04-18
RU2014121100A (en) 2015-12-10
IN2014KN00813A (en) 2015-10-02
BR112014009730B1 (en) 2020-11-17
DE102011085253A1 (en) 2013-05-02
BR112014009730B8 (en) 2023-04-25
KR20140082729A (en) 2014-07-02
EP2754218A1 (en) 2014-07-16
RU2602271C2 (en) 2016-11-20
ES2643890T3 (en) 2017-11-27
WO2013060591A1 (en) 2013-05-02
KR102029511B1 (en) 2019-10-07
AU2012327353A1 (en) 2014-05-01

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