WO2020022875A1 - Système de surveillance d'un réseau électrique moyenne tension et procédé associé - Google Patents

Système de surveillance d'un réseau électrique moyenne tension et procédé associé Download PDF

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Publication number
WO2020022875A1
WO2020022875A1 PCT/NL2019/050434 NL2019050434W WO2020022875A1 WO 2020022875 A1 WO2020022875 A1 WO 2020022875A1 NL 2019050434 W NL2019050434 W NL 2019050434W WO 2020022875 A1 WO2020022875 A1 WO 2020022875A1
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WO
WIPO (PCT)
Prior art keywords
current
load
monitoring device
break switch
medium
Prior art date
Application number
PCT/NL2019/050434
Other languages
English (en)
Other versions
WO2020022875A8 (fr
Inventor
Johannes TILLEMA
Richard GINUS
Original Assignee
Tryst B.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tryst B.V. filed Critical Tryst B.V.
Priority to EP19749845.4A priority Critical patent/EP3830587A1/fr
Publication of WO2020022875A1 publication Critical patent/WO2020022875A1/fr
Publication of WO2020022875A8 publication Critical patent/WO2020022875A8/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/181—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using coils without a magnetic core, e.g. Rogowski coils
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G01R19/2513—Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
    • G01R31/3272—Apparatus, systems or circuits therefor
    • G01R31/3274—Details related to measuring, e.g. sensing, displaying or computing; Measuring of variables related to the contact pieces, e.g. wear, position or resistance
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means

Definitions

  • the invention relates to a monitoring system of a medium-voltage electric power network.
  • a medium-voltage electric power network can be defined as a network on an operating voltage of approximately 3 kV to 25 kV, and can generally serve an area including a group of houses, for example a street of houses, or a single larger building, such as an industrial plant.
  • the medium- voltage network includes transformer stations where high voltage power is transformed into medium-voltage power, as well as transformer substations or distribution substations of an electric power system, where medium voltage power is transformed into low voltage power which is then supplied to individual users.
  • Grid operators managing a medium-voltage power network can be faced with different types of problems, such as for example short circuits in the medium-voltage power network, which affect a relatively large number of people.
  • medium-voltage transformer substations can for example be provided with load-break switches, fused load-break switches and/or circuit breakers.
  • the load-break switches which are arranged to deviate current in case of an overload, can for example be provided with a visual indicator, such as a red hght, indicating that an error, such as a current with a too high amperage, has passed the load-break switch.
  • a communication means in a transformer substation may be relatively cumbersome, as these transformer substations may be relatively small with no or only limited access for people, and hardly any space for installing a communication device for example with fiberglass cable connection.
  • mount one or more current and/or voltage sensors in a transformer station but not in transformer or distribution substations, to monitor current and/or voltage of the high-voltage network and give a warning in case of a peak current and/or voltage above a given threshold value.
  • Such a sensor is usually mounted around a current conductor, the current on the network needs to be cut-off in order to install the sensor to the circuit breaker.
  • the invention aims at providing a monitoring system of a medium voltage network which can allow to detect possible problems before problems on the medium voltage network arise.
  • a monitoring device according to the features of claim 1.
  • the monitoring device having a closed housing in which a current sensor, A/D converter and communication interface are provided, an electrically contactless monitoring device is obtained.
  • the housing is only provided with mechanical connection elements to be mounted onto a load- break switch. Since there is no electrical contact or electrical interference with the current conductors through the load-break switch, the device can be mounted onto the load-break switch without interruption of the power onto the medium voltage power network the load-break switch is connected to. This provides for a major advantage for the operator of such a medium voltage network, as the monitoring devices can be mounted to the load- break switches when the network is under power and in use.
  • the employee mounting the devices onto the load-break switches can do this in a safe and reliable manner.
  • the current passing through the load-break switch is sensed at a distance from the current conductor, namely outside of the load- break switch, and is sensed contactless from the current conductor using only the magnetic field induced by the current passing through the load- break swatch.
  • prior art current sensor which need to be built in into the load-break switch, because the current sensor needs to be
  • the device according to the invention can accurately sense the current relying solely on the induced magnetic field by the current passing through the load-break switch.
  • the current sensor can be an LC -circuit or can be an L-circuit.[n;i]
  • the monitoring device can thus be placed at a distance from the power network, namely outside the cover of the load-break swatch, whereas a conventional sensor needs to be positioned inside the cover of the load-break switch.
  • the housing is entirely closed such that the housing is electrically clean, there are no electrical contact points on or through the housing.
  • the housing is also sealingly closed to close it for dust, dirt and environmental influences.
  • the device is a self-contained device, wherein all components to sense and detect whether the current is above or below a predefined threshold are within the device and there is only a wireless communication with a central controller outside of the device.
  • Components such as the A/D converter and/or the micro-controller may use some power that they can tap off from the current induced in the current sensor, or that is provided by a power supply such as a battery inside of the device or a power supply such as a photovoltaic cell on the housing of the device.
  • a power supply such as a battery inside of the device or a power supply such as a photovoltaic cell on the housing of the device.
  • the mechanical connection elements are arranged to connect with connection elements that are on the outside of the load-break switch. On the outside of the load-break switch often connection elements are provided to engage with a dedicated tooling for opening and/or closing the load-break switch. These connection elements may thus be used to receive the self-contained monitoring device.
  • the monitoring system for monitoring a medium- voltage electric power network comprises at least one monitoring device including an LC-circuit or an L-circuit arranged to measure an amplitude of a current of the medium-voltage network, an A/D convertor arranged to convert an analog input of the measured amplitude of the current into a digital output corresponding to a current of the medium-voltage network, and a communication interface connected to the A/D convertor and arranged to send a signal to a controller when a current is detected above or below a predetermined threshold of current.
  • an L-circuit can be considered as the current sensor for sensing the current of the medium voltage network.
  • the monitoring system further comprises a controller arranged to receive and analyse signals from the at least one monitoring device.
  • an LC-circuit comprises at least an inductor L and a capacitor C, and may for example also comprise a resistor R, which can stabihze the current measurement.
  • the current sensor can be used to measure an amplitude of a current of the medium -volt age network, in particular of a current going through a load-break switch in a medium- voltage transformer substation, in that the current induced in the LC-circuit by the magnetic field which is generated by the current in the medium- voltage network is a measure for the amplitude of the current in the medium-voltage network.
  • An inductor of the LC-circuit is used as a pick-up coil for the magnetic field generated by the current at a predefined frequency in a current conductor of the load-break switch. This is contrary to the normal use of an LC-circuit as a filter, in which application the inductor is generally protected from external magnetic fields.
  • the inductor C can be obviated with.
  • the L-sensor only is possible since the magnetic field of the medium voltage power network running through the load-break switch outside which the monitoring device is mounted, is relatively strong, namely sufficiently strong for the L inductor to be picked up. So, to reduce the number of components and to make the device more cost effective, the inductor C can be omitted in the current sensor. By using an LC-circuit as current sensor, a more weak magnetic field can be picked up as well.
  • an LC-circuit or an L-circuit allows a contactless measurement of the current in the medium-voltage network.
  • the current can be sensed continuously instead of a measuring at sampled time intervals.
  • the current measured by the current sensor is then amplified and transmitted to an A/D converter such that the measured raw current signal can be transmitted to a digital measurement current signal that further be processed, e.g. by a microcontroller.
  • the A/D converter can then check on a regular,
  • a signal conditioning device or an interpretation circuit arranged to derive the current in the medium-voltage network from the measured amplitude of current in the LC-circuit, and which device or circuit may for example be part of the A/D -convertor, can function with only a relatively small energy supply.
  • the communication interface can be arranged to send a signal to a controller only when the derived current is above or below a predetermined threshold of current, which threshold may be a
  • the communication interface can for example include a programmable digital comparator to compare the derived value of current in the medium -voltage network based on the measured amplitude of current in the LC-circuit with one or more pre-determined threshold values, for example with a lower threshold and an upper threshold.
  • the A/D-convertor can include a programmable analogue comparator to compare said derived value of current with one or more pre-determined current threshold values. This may for example be done at the level of the measured amplitudes of current in the LC-circuit, so before an interpretation circuit can derive the current in the medium -voltage network.
  • the analogue signal including the derived current in the medium -voltage network can be converted into a digital signal after having compared the value with one or more pre- determined threshold values, so for example only when a current value of the medium-voltage network is detected above or below one or more pre determined threshold values.
  • This may be advantageous in terms of energy supply, as the energy consumption for the A/D conversion is higher than the energy consumption of an analogue comparator.
  • the A/D converter evaluates on an intermittent basis whether or not the measured current exceeds the pre-determined threshold value and/or is below a predetermined threshold.
  • the current sensor measures the current in a continuous manner, but the A/D converter can check in a discrete or intermittent manner the measured current.
  • a time interval can be set to the A/D converter to intermittently check the ⁇ measured current. As such, the energy consumption of the A/D converter can be kept relatively low.
  • An upper threshold can for example be
  • a load-break switch may react to a peak current
  • a lower threshold for example set at 0 A, it may be used to detect an interruption of current.
  • the communication interface may be a wired communication device or a wireless communication interface, and is arranged to send real-time signals of the real-time current measurements.
  • the monitoring device can preferably be arranged to measure current passing through a load-break switch of the medium-voltage electric power network, in particular through a load-break switch which is installed in a medium -voltage transformer substation and which is arranged to deviate a current in case of overload.
  • load-break switches may also be called switch disconnectors or switch gaps.
  • the monitoring device can be installed at a relatively accessible location to monitor a medium-voltage network.
  • the monitoring device may mountable on a load- break switch of a medium -volt age electric power network without
  • a load-break switch generally comprises a first part, which may not be touched during maintenance as it is not guaranteed to be safe, and a second part, generally in a different colour to be clearly recognizable, and generally directed to a front side, which may be manipulated with the help of dedicated tools.
  • Said second part at a front side of a load-break switch may therefore include tool connection elements, for example a pair of ridges, to allow connection between the load-break switch and such a dedicated tool.
  • the monitoring device of the present invention can for example also include connection elements which correspond to, and can engage, the tool connection elements on the load-break switch. In this way, the monitoring device may be mounted on a load-break switch of a medium-voltage electric power network without interruption of power on the network. Alternatively, the monitoring device may be fixed on the load-break switch in another known way, such as clamped, glued, screwed or differently, as long as the monitoring device is mounted to the load-break switch at a fixed location.
  • the predetermined threshold is preferably adjustable.
  • the communication interface and/or the A/D convertor can for example include a programmable analogue or digital comparator, such that the predetermined threshold can be adjustable through programming or dedicated software.
  • the threshold can for example be adjusted once a first threshold has been reached regularly, for example when part of the network is increasingly loaded over time.
  • the threshold can be adjusted remotely from a central controller that may give instructions to the controller and/or the A/D converter to adapt the threshold, preferably via wireless communication.
  • the monitoring device may further advantageously comprise a fluxgate magnetic sensor.
  • the magnetic flux-sensor can detect a magnetic field which is generated by the current in a current conductor of the medium-voltage electric power network, for example by the current in a load-break switch. Current measurements by such a magnetic flux-sensor are relatively accurate, and can provide additional information over the measurements by the current sensor, e.g. the LC-circuit or an L-circuit, such as for example an absolute value of current in the medium -voltage network.
  • the magnetic flux-sensor may further be arranged to provide an analogue output which is proportional to the current generating the detected magnetic field, for example through the flux-sensor being provided with a compensation circuit.
  • the magnetic flux-sensor may be arranged to do measurements only at pre-determined time intervals rather than measuring continuously.
  • the combination of continuous measurements by the LC-circuit with interval measurements which may be more accurate, can provide valuable information on a status of a medium- voltage electric power network and can allow precautionary actions to be taken, for example when part of the network shows an increasing load over time, rather than only allowing to intervene after a problem, such as a short-circuit due to an overload, has taken place and been reported by a known monitoring system.
  • the monitoring device may preferably further comprise a voltage sensor.
  • the voltage sensor can for example include a capacitor having two conducting plates, for example copper plates, wherein the capacitor senses the electric field surrounding the load-break switch, wherein a voltage difference between the plates of the capacitor generated by the electric field is identified. This measured voltage difference may give an indication of the voltage on the current conductor.
  • a voltage occurring in a conductor of a medium-voltage network may be approximately 10 kV or more or less, such a voltage sensor is preferably configured to detect such relatively high voltage values. In this way, the voltage sensor can detect a voltage of a medium-voltage network at a distance of a current conductor, namely outside of the load-break switch where it is, also electrically, safe.
  • the monitoring device can be positioned outside of the load-break switch, which is a safe location, in particularly, an electrical safe location.
  • the monitoring device with the voltage sensor can be installed while the power network is running.
  • the voltage of the power network can thus be sensed contact-free from the network and at a distance from the current conductor running through the load-break switch.
  • a printed circuit board is provided on which the current sensor and/or the voltage sensor are provided, and additionally on which a micro-controller and a wireless communication interface is provided.
  • the measured current and/or voltage signals can be sent wirelessly to a central controller for further processing, e.g. alerting or analyzing.
  • Monitoring system comprising a plurality of monitoring devices, wherein the monitoring devices are mounted at various locations within the medium-voltage electric power network during use.
  • Different medium- voltage transformer substations may for example be provided with one or more monitoring devices, preferably one monitoring device for every load- break switch, which devices may all be connected to a same controller.
  • a comprehensive monitoring of a medium-voltage power network may be carried out, which monitoring allows precautionary actions to be taken on the network to prevent problems rather than repair the network after a problem has occurred.
  • the monitoring system can
  • a monitoring system assembly comprising load-break switches, wherein the monitoring devices are mounted to an outer side of the associated load- break switches. There is thus only a mechanical connection between the load-break switches and the monitoring devices, in particular between an outside of the monitoring device and an outside of the load-break switch.
  • a method for monitoring a medium -voltage electric power network can provide one or more of the above-mentioned advantages.
  • a retro-fittable monitoring device for a monitoring system of a medium-voltage electric power network.
  • existing transformer substations of a medium-voltage electric power network can be provided with one or more of the monitoring devices in a relatively easy and economical way.
  • a load-break switch for a medium-voltage electric power network comprising a monitoring device of a monitoring system.
  • the monitoring device can relatively easily be integrated into a load-break switch of such a new transformer substation.
  • a use of a monitoring system in a medium-voltage electric power network substation can provide one or more of the above- mentioned advantages.
  • Figures la shows a perspective view on a load-break switch provided with an embodiment in an exploded view of a monitoring device according to the invention in a transformer substation of a medium-voltage electric power network shown in Figure lb;
  • Figure 2 shows a perspective view on the load-break switch of Figure la provided with an embodiment of a monitoring device according to the invention
  • Figure 3 shows a schematic circuit of components for current sensing in an embodiment of a monitoring device of a monitoring system according to the invention
  • Figure 4 shows a schematic circuit of components for voltage sensing in an embodiment of a monitoring device according to the invention
  • Figure 5 schematically shows a monitoring system assembly according to the invention.
  • FIGs la and 2 show a perspective view on a load-break switch 1 provided with an embodiment of a monitoring device 2 of a monitoring system 100 according to the invention.
  • the monitoring device 2 is arranged to measure current passing through the load-break switch 1 of the medium- voltage electric power network.
  • a load-break switch 1 can for example be found in a transformer substation 3 of a medium-voltage electric power network, as shown for example in Figure lb.
  • Such a transformer substation 3 of a medium -voltage electric power network can for example be situated in an industrial plant transforming medium voltage power into low voltage power and providing electric power to the entire plant.
  • Such a substation 3 can also be situated near a group of houses, supplying electric power to for example all houses in a given street or area.
  • transformer substations 3 are generally equipped with load-break switches 1, fused load-break switches and/or circuit breakers and may further comprise other secondary equipment.
  • load-break switches 1 there are for example nine load-break switches 1, in groups of three, each load-break switch 1 of a group of three being for one phase of the three-phase current.
  • the load-break switch 1 can deviate current and/or isolate part of the network in case of a failure, such as an overload current.
  • the load-break switches 1 can for example be provided with a visual indicator 4, such as a red light, indicating that an error, such as a current with a too high amperage, has passed the load-break switch 1.
  • the load- break switch 1 generally includes a dark coloured part 5 which may not be touched as this part is not guaranteed safe when in operation, and a light coloured front part 6 into which a dedicated tool can be clamped to remove the load-break switch 1 from the network if necessary.
  • the light- coloured front part 6 can for example include two flanges 7 which are spaced-apart and between which a tool receiving space 8 is formed. These flanges serve as connection elements for a dedicated tool that can open and close the load-break switch.
  • the shape of the flanges 7, for example an inversed L-shape, or any other suitable shape, can be such that a tool can be clamped in between said two flanges.
  • the invention can make use of the existing clamping system to mount a monitoring device 2 of a monitoring system to the load-break switch 1.
  • the monitoring device 2 can be provided with connection elements 9, 10 that are arranged to cooperate with the connection elements 7 of the load-break switch 1.
  • the connection elements of the monitoring device 2 can for example comprise two mounting plates 9 which can be clamped in the existing clamping systems, for example in the flanges 7, and onto which the monitoring device 2 can be fixated, for example by screws 10 or bolts or any other suitable fixating means.
  • the monitoring device 2 is mountable on a fixed location on the load-break switch 1 of a medium-voltage electric power network without interruption of power on the network.
  • the light-coloured front part 6 or panel can for example also comprise the visual indicator 4, which may then be covered by the
  • the monitoring device 2 itself may comprise a housing 11 enclosing a printed circuit board 12.
  • the housing 11 of the monitoring device 2 is entirely closed so that the components contained inside it are protected for dust, dirt and environmental influences. There is also no electrical connection at or through the housing 11. Only mechanical connection elements to mechanically mount the monitoring device 2 to the load-break switch 1 are provided to the housing 11. Inside the housing 11, a printed circuit board 12 is provided on which printed circuit board 12 the
  • the monitoring device 2 such as a current sensor, an A/D converter, a micro-controller and a wireless communication interface are provided for wireless and contactless measuring and monitoring the current passing through the load-break switch 1 associated with the monitoring device 2.
  • the current sensing circuit is shown in figure 3 and explained in relation to figure 3.
  • the monitoring device 2 can be provided with a voltage sensing circuit comprising a voltage sensor.
  • the voltage sensing circuit is shown in figure 4 and explained in relation to figure 4.
  • the monitoring device 2 is thus fully self-contained and provides for wireless and contactless monitoring of the current passing through the load-break switch from an outside of the load-break switch.
  • each load-break switch 1 of a substation 3 is provided with a monitoring device 2 such that each load-break switch 1 has a monitoring device 2 associated to it, i.e. mounted to it, to monitor the current passing through the load-break switch associated with the monitoring device 2.
  • FIG 3 shows a schematic circuit of an embodiment of a current sensing circuit 20 of the monitoring device 2 of a monitoring system 100 according to the invention.
  • the circuit 20 can for example be implemented on a printed circuit board 12, as shown in Figure la.
  • the monitoring device 2 at least includes a current sensor 13, an A/D convertor 14, and micro controller 16 and a wireless communication unit. It is noted that the micro controller and the wireless communication interface can be a single component, in which the controller also provides for the wireless
  • the mictro- controller 16 includes the wireless communication interface.
  • the wireless communication interface can be provided as a separate communication unit.
  • the current sensor 13 is here provided as an LC-circuit 13 including an inductor L and an capacitor C.
  • the LC-circuit 13 may further comprise a resistance R, connected in parallel with the inductor L and the capacitor C, which can make the LC-circuit more stable.
  • the inductor L picks up the magnetic field induced by the current conductor of the load- break switch 1 and charges the capacitor C. So, an amplitude of the current can be measured.
  • an offset may be provided to the capacitor by putting a reference voltage on the capacitor. Then, the whole amplitude of the current is being measured.
  • the current sensor 13 is an inductor L only that is being charged by the magnetic field of the current passing through a current conductor of the load-break switch 2 that is at a distance from the sensor 13. Since the frequency of the medium voltage power network is more or less known, it appeared that the capacitor C can be obviated and that the inductor L is sufficient to sense the current of the medium voltage power network.
  • the senor 13 is not even in the same housing as the current conductor which current it is to sense, namely the load-break switch, but is outside of the housing of the load-break switch 2 and is in a separate housing 11 at a distance from the current conductor that is in the load-break switch.
  • the separate housing 11 of the monitoring device 2 is being mounted on the housing of the load-break switch, so entirely outside of the load-break switch 1. There is no electrical integration to the current conductor of the load-break switch 1. To the contrary, the electrical current is sensed outside of the load-break switch and entirely wireless and contactless.
  • the A/D convertor 14 may include, or may be connected to, a micro controller 16. Communication between the A/D convertor 14 and the micro controller 16 may for example be arranged via an inter-integrated circuit I2C (or I 2 C) computer bus 17 and -protocol.
  • the micro-controller 16 can preferably remain in a low power mode, unless a signal from the A/D convertor 14 activates the micro-controller 16. After activation of the micro controller 16 by the A/D convertor 14, the micro-controller 16 can be arranged to send a wireless signal to a central controller (not shown) of the monitoring system 100 when a current is detected above or below a predetermined threshold of current.
  • the micro-controller 16 can be considered as being the communication interface of the monitoring device 2, or can include the communication interface of the monitoring device 2.
  • the predetermined threshold of current can be adjustable, as the threshold may be programmed on the micro-controller or on the A/D convertor, or programmed in the central controller or a cloud and sent to the micro controller.
  • the central controller which is part of the monitoring system 100, but not part of the monitoring device 2, may be remote and spaced-apart from the at least one monitoring device 2.
  • a central controller may for example be a computer, and is configured to receive and analyse signals from the at least one monitoring device 2.
  • Such a controller may for example be provided in a transformer substation 3, where the controller may be connected with the micro controller 16 in a wired or in a wireless manner.
  • the central controller may be provided outside a transformer substation 3, for example at a central monitoring location, where the controller may be arranged to receive and analyse signals from a plurality of monitoring devices 2 in one or more transformer substations 3.
  • the monitoring device 2 may additionally comprise a fluxgate magnetic sensor and/or a voltage sensor, preferably integrated on the same printed circuit board 12.
  • Figure 4 shows an embodiment of a voltage sensing circuit 30 comprising a capacitor C that is being charged by the electric field surrounding the load-break switch 1. The voltage over the capacitor C is being amplified by an amplifier 15 before being fed to an A/D converter 14.
  • the amplifier 15 is embodied as a differential amplifier comprising a number of resistors R.
  • the A/D converter 14 is in communication with the micro-controller 16 that is configured to analyse whether there is a voltage or not. When no voltage is detected, the micro-controller 16 comprising a wireless communication interface to wirelessly send a signal to the central controller.
  • a reference voltage Rf can be applied to more accurately determine whether a voltage is detected or not.
  • the current sensor 13 and the voltage sensor 31 continuously sense the current and voltage respectively.
  • the A/D converter 14 and/or micro controller 16 may be configured to intermittently, at predefined time intervals, check whether current is below or above a predetermined threshold or whether there is a voltage or not. As such, the energy
  • the A/D converter and/or the micro-controller may be powered by current tapped or bypassed from the monitoring device, or can be provided by a power storage unit such as a battery. Since the monitoring- device is fully self-contained, the device is not charged externally.
  • FIG. 5 schematically illustrates the monitoring system 100 comprising a central controller 300 that is in wireless communication with a plurality of monitoring devices 2.
  • the monitoring devices 2 are only mechanically connected to the load-break switches 1, of which preferably each monitoring device 2 is mounted on its associated load-break switch 1.
  • the monitoring system 100 together with the associated load-break switches 1 on which the monitoring devices 2 are mounted, provide for a monitoring system assembly.
  • the current, and preferably also voltage, of the network to which the load-break switches are connected can be monitored remotely wherein the central controller 300 can monitor multiple
  • This allows a more efficient and more convenient maintenance of the medium voltage power network.
  • the monitoring device 2 as a self-contained device of which the housing is electrically safe, and thus can be normally handled, the device can easily be mounted onto the load-break switch during operation of the substation and the power network.
  • any reference signs placed between parentheses shall not be construed as limiting the claim.
  • the word‘comprising’ does not exclude the presence of other features or steps than those listed in a claim.
  • the words‘a’ and‘an’ shall not be construed as limited to‘only one’, but instead are used to mean‘at least one’, and do not exclude a plurality.
  • the mere fact that certain measures are recited in mutually different claims does not indicate that a combination of these measures cannot be used to an advantage. Many variants will be apparent to the person skilled in the art. All variants are understood to be comprised within the scope of the invention defined in the following claims.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

Un système de surveillance pour surveiller un réseau d'alimentation électrique moyenne tension, qui peut être défini comme un réseau fonctionnant sur une tension d'environ 3 kV à 25 kV, le système comprenant au moins un dispositif de surveillance et un dispositif de commande conçu pour recevoir et analyser des signaux provenant du ou des dispositifs de surveillance.
PCT/NL2019/050434 2018-07-27 2019-07-11 Système de surveillance d'un réseau électrique moyenne tension et procédé associé WO2020022875A1 (fr)

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NL2021408A NL2021408B1 (en) 2018-07-27 2018-07-27 Monitoring system of a medium-voltage electric power network, and method thereto

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CN112051441B (zh) * 2020-09-18 2022-03-18 国网山东省电力公司临朐县供电公司 一种电力通信网络线路检测系统

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