EP3396688A1 - Procédé de fonctionnement d'un transformateur et appareil pour un transformateur - Google Patents

Procédé de fonctionnement d'un transformateur et appareil pour un transformateur Download PDF

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Publication number
EP3396688A1
EP3396688A1 EP17168820.3A EP17168820A EP3396688A1 EP 3396688 A1 EP3396688 A1 EP 3396688A1 EP 17168820 A EP17168820 A EP 17168820A EP 3396688 A1 EP3396688 A1 EP 3396688A1
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EP
European Patent Office
Prior art keywords
transformer
cooling
cooling unit
true power
coolant
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.)
Withdrawn
Application number
EP17168820.3A
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German (de)
English (en)
Inventor
Yoann Alphand
Toufann Chaudhuri
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Schweiz AG
Original Assignee
ABB Schweiz AG
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 ABB Schweiz AG filed Critical ABB Schweiz AG
Priority to EP17168820.3A priority Critical patent/EP3396688A1/fr
Publication of EP3396688A1 publication Critical patent/EP3396688A1/fr
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • H01F2027/404—Protective devices specially adapted for fluid filled transformers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • H01F2027/406—Temperature sensor or protection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling

Definitions

  • Embodiments of the present disclosure relate to a method of operating a transformer.
  • embodiments of the present disclosure relate to a transformer having a cooling system with a cooling unit for actively cooling the transformer.
  • a transformer transfers electrical energy between two or more circuits.
  • heat is typically generated by the currents drawn from and conducted through the transformer.
  • Increased temperatures during operation can deteriorate the performance and the life expectancy of a transformer.
  • it can be important to maintain the temperature of a transformer below a certain temperature value, as elevated temperatures may lead to reduced reliability or even to premature failure of the transformer.
  • transformers may include cooling systems such as active cooling systems for actively dissipating the heat generated by the transformer or passive cooling systems for dissipating the heat by natural convection.
  • Active cooling systems typically generate a flow of a coolant for forced cooling of the transformer.
  • Typical coolants used for cooling of a transformer may include, for example, air, oil, in particular transformer oil, such as for example: mineral oil, silicon oil, or natural esters and synthetic esters.
  • a mechanical sensor such as for example a mechanical flow meter.
  • Mechanical sensors are typically in direct contact with the coolant for measuring the coolant flow.
  • a mechanical sensor can include a mechanical indicator, such as a paddle, that measures the force exerted thereon by the coolant flow.
  • the aim of such mechanical sensors is to detect whether an oil flow is present.
  • a paddle may move relatively to the coolant flow. The movement may for example actuate a microswitch.
  • mechanical parts of the mechanical sensor may age, e.g. corrode, which may deteriorate flow detection.
  • Mechanical parts such as for example metallic parts, may also become loose. For example, mechanical parts may drop into the coolant. Therefore, loose mechanical parts may further impose a risk on proper operation of the transformer.
  • the temperatures of the transformer can rise quickly.
  • the temperature of the coils may rise quickly and may deteriorate the windings of the coils.
  • the rise of the temperature may happen faster than the detection of the sudden temperature rise by a temperature sensor installed on or inside the transformer.
  • a deteriorated flow detection of the mechanical flow sensor indicates a fault signal despite of the presence of a sufficient coolant flow
  • operating the transformer may have to be halted. Consequently, the transformer stops providing power to electrical connected equipment, such as, for example, an electrical motor. This may lead to increased operating costs of the transformer and/or the equipment operated by the transformer For example, if a mechanical flow sensor for a traction transformer indicates a false error, the train may have to be stopped.
  • a method of operating a transformer wherein the transformer generates heat when being operated and wherein the transformer includes a cooling unit for forced cooling of the transformer.
  • the method includes generating by the cooling unit a flow of a coolant along a cooling path for forced cooling of the transformer.
  • the method further includes measuring a true power value supplied to the cooling unit. Further, the method includes comparing the detected true power value with a predetermined true power threshold value.
  • a coolant flow detecting device for a transformer, wherein the transformer generates heat when being operated and wherein the transformer includes a cooling unit for forced cooling of the transformer.
  • the coolant flow detecting device includes a detector for measuring a true power value supplied to the cooling unit, wherein the cooling unit is adapted to generate a flow of a coolant along a cooling path for forced cooling of the transformer.
  • the coolant flow detecting device further includes a controller for comparing the detected true power value with a predetermined true power threshold value.
  • a method of operating a transformer wherein the transformer generates heat when being operated and wherein the transformer includes a cooling unit for forced cooling of the transformer.
  • the method includes generating by the cooling unit a flow of a coolant along a cooling path for forced cooling of the transformer.
  • the method further includes measuring a true power value supplied to the cooling unit. Further, the method includes comparing the detected true power value with a predetermined true power threshold value.
  • mechanical coolant flow sensors provided for the transformer or for the transformer cooling circuit can be subject to corrosion or mechanical agingm which may affect the reliability of the mechanical coolant flow sensor.
  • the flow detection of the mechanical coolant flow sensor may become deteriorated.
  • the flow detection may then become unreliable.
  • the transformer may get damaged due to overheating when an insufficient coolant flow is not reliably detected.
  • an unreliable flow detection or a failure of the mechanical coolant flow sensor may also lead to a false error signal indicating erroneously an insufficient coolant flow.
  • the present embodiments overcome this problem by measuring a true power value supplied to the cooling unit.
  • the detected true power value is compared with a predetermined true power threshold value.
  • the coolant flow is detected based on the true power value supplied by, for example, a power supply, to the cooling unit.
  • True power may also be referred to as real power.
  • the supplied true power value to the cooling unit may differ from the rated power value of the cooling unit or the apparent power.
  • the apparent power value is defined as the product of the root-mean-square values of voltage and current.
  • the power factor PF is defined as the cosine of the angle of the phase difference between the current waveform and the voltage waveform. Accordingly, true power differs from the apparent power due to a phase difference between the voltage and the current. True power measurement may be performed by a Wattmeter suitable for AC applications.
  • the true power value may be derived by measuring the apparent power, that is to say the root-mean-square values of voltage and current, and measuring, for example with an oscilloscope, the phase difference between the voltage and the current waveform.
  • a measured true power value that is lower than a true power threshold value may be related to a malfunction of the cooling unit, such that a sufficient coolant flow may no longer be provided by the cooling unit. That is to say, that an insufficient coolant flow can be linked to a detected true power value that is provided to the cooling unit. For example, failure of the cooling unit will be detectable by observing the value of the true power measurement.
  • the cooling of the transformer by the cooling unit may be monitored by detecting a true power value supplied to the cooling unit.
  • embodiments described herein may monitor whether a sufficient coolant flow is provided by the cooling unit.
  • Fig. 1 illustrates a schematic view of a coolant flow detecting device 100 for a transformer according to embodiments described herein.
  • the coolant flow detecting device 100 is configured to perform the method described above and also described later with reference to Fig. 2 to Fig. 4 .
  • the transformer can include a cooling unit 110.
  • the cooling unit 110 can be, for example, a pump, such as a circulating pump, or an oil pump.
  • the cooling unit 110 can have a coolant intake and a coolant exhaust.
  • the cooling unit 110 is adapted to generate a flow of a coolant.
  • Reference numeral 150 figuratively illustrates the flow of a coolant.
  • the flow 150 of the coolant may be provided along a cooling path 170, as shown in Fig. 1 .
  • the cooling unit 110 can be supplied with power by a power supply 140.
  • the power supply 140 can be connected to the cooling unit 110 by a power supply line 160. Cooling units according to embodiments described herein are typically supplied with an electric power by an electrical power supply. Accordingly, the power supply line 160 may electrically connect the cooling unit 110 and the power supply 140. According to embodiments described herein, the power supply is an AC power supply.
  • the power supply 140 may be provided outside of the transformer and could be connected to the cooling unit 110 arranged outside or inside of the transformer. Alternatively, the power supply 140 may be an auxiliary transformer of the transformer.
  • the cooling path 170 can be a closed cooling circuit.
  • a closed cooling circuit could be understood as a closed cooling system providing a circulating coolant within.
  • the closed cooling system may, for example, include one or more pipings.
  • the cooling unit 110 could be a fan, e.g. a mechanical fan.
  • the fan may generate a flow of coolant, which may be a gas such as air.
  • the cooling path 170 may be an open cooling circuit.
  • a fan may be described as a cooling unit having an open cooling circuit.
  • an emitted flow of a coolant at the coolant exhaust of the cooling unit 110 is not necessarily fed back to the coolant intake of the cooling unit 110.
  • the coolant intake of the cooling unit 110 may be supplied by a reservoir of a coolant, such as the air surrounding a fan cooling unit.
  • the coolant flow detecting device 100 includes a detector 120 for measuring a true power value supplied to the cooling unit 110.
  • the detector 120 is configured to detect the true power value supplied to the cooling unit 110 by the power supply 140.
  • the detector 120 may be configured to measure an instantaneous voltage value and an instantaneous current value. The detector 120 may then derive the true power value.
  • the detector 120 may use different ways of measuring the true power value, such as measuring the true power value by implementing various definitions of true power as, for example, the definitions described herein.
  • the detector 120 can include a wattmeter suitable for AC measurements.
  • the detector 120 may also include a digital oscilloscope for measuring the true power value.
  • measuring the true power value supplied to the cooling unit 110 includes performing a measurement on-line of the power supply line 160 of the cooling unit 110.
  • the detector 120 can be arranged between an electrical connection of the cooling unit 110 and the power supply 140.
  • the arrangement of the detector 110 may be such that a voltage and a current could be measured, in particular, substantially at the same time.
  • measuring the true power value includes measuring a value selected from a group comprising of: a voltage, a current, a time, a phase difference, and combinations thereof. For instance, several voltage values and current values may be measured successively and integrated over a period of time. The true power value may be then determined by averaging the integrated value. By measuring the true power value, the power consumed by the cooling unit 110 can be determined.
  • the coolant flow detecting device includes a controller 130 for comparing the detected true power value with a predetermined true power threshold value.
  • the detector 120 is typically in communication (i.e. signal or data communication) with the controller 130.
  • the controller 130 may be connected to the detector 120, such that the measured true power value is received by the controller 130 from the detector 120.
  • the connection may be an electrical signaling line.
  • the coolant flow detecting device can detect, if a sufficient flow of coolant is provided by the cooling unit 110, as also described in more detail hereafter. This has the benefit that no mechanical parts may have to be exposed in the coolant for detecting the flow of the coolant.
  • embodiments of the present disclosure may provide a more reliable operation of a cooling unit for a transformer, as the risk of ageing of mechanical parts or even loosing mechanical parts in the coolant may be decreased.
  • embodiments of the present disclosure can reduce the risk of coolant leakage.
  • Fig. 2 schematically illustrates a cross-sectional view of a transformer 200 including a coolant flow detecting device 100.
  • the coolant flow detecting device 100 may be similar to the coolant flow detecting device depicted in Fig. 1 , so that reference can be made to the above explanations.
  • the transformer 200 includes windings 240 disposed in the transformer housing.
  • a transformer tank 250 is provided within the transformer housing.
  • the transformer tank 250 is configured to enclose a coolant, e.g. a fluid coolant.
  • a fluid coolant may be, for example, oil, in particular, transformer oil having electrical insulating properties. The coolant can flow past the windings 240 and can absorb heat generated by currents drawn through the windings 240.
  • the transformer 200 includes a cooling circuit 220 as a cooling path.
  • the cooling circuit 220 may for example include a heat exchanger.
  • the heat exchanger may be in fluid connection to the transformer tank 250.
  • the heat exchanger may be positioned such that at least an area of a surface is exposed on the outside of the transformer.
  • the heat exchanger may take up heat from one coolant and releases the heat to another coolant provided outside of the transformer.
  • a cooling unit 110 is provided for the transformer 200.
  • the cooling unit 110 may be arranged within a portion of the cooling circuit 220, as exemplarily shown in Fig. 2 .
  • a coolant is moved by the cooling unit 110, which results in a flow 150 of the coolant from the coolant intake to the coolant exhaust of the cooling unit 110.
  • the cooling unit 110 can provide a flow 150 of a coolant inside the cooling circuit 220.
  • the coolant may take up heat from a first portion of the transformer and release the heat to a second portion of the transformer. For instance, the heat may be taken up from the windings 240 of the transformer. The heat may be then released at a heat exchanger of the transformer.
  • the cooling unit 110 is connected to an external power supply 140 by a power supply line 160.
  • a detector 120 for measuring a true power value supplied to the cooling unit 110 is connected to the cooling unit 110.
  • the detector 120 is arranged within the power supply line 160.
  • a controller 130 is further connected to the detector 120.
  • the coolant flow detecting device 100 may be provided for a cooling unit 110 including a circulating pump.
  • the cooling unit 110 is designed as a circulating pump and can be adapted to provide a flow 150 of a transformer cooling fluid circulating in a cooling circuit 220 of the transformer 200.
  • a desired operational condition can be, for example, an operational condition in which a sufficient flow of a coolant is provided, such that the transformer is not exceeding a temperature value that may damage the transformer or parts of the transformer. In other words, in a desired operational conditions, the transformer is cooled sufficiently.
  • a signal can be emitted, if the cooling unit 110 is not in a desired operational condition.
  • the signal may be selected from the group consisting of: an electrical signal, an acoustic signal, a visual or optical signal, a mechanical signal, and combinations thereof. This may have the beneficial effect of an early fault detection. In particular, the fault may be detected at an early stage of emerging insufficient flow of coolant before temperature rises to unbeneficial elevated values.
  • the coolant flow detecting device 100 may include a controller 130 connectable to a signaling unit for emitting a signal selected from the group consisting of: an electrical signal, an acoustic signal, a visual or optical signal, a mechanical signal, and combinations thereof
  • the coolant flow detecting device 100 can include a temperature sensor 210 for measuring a temperature of a portion of the transformer 200, as exemplarily shown in Fig. 2 .
  • the temperature sensor 210 may, for example, be arranged within welded thermowells of the transformer 200.
  • the temperature sensor 210 could also be disposed directly on the outer surface of the transformer tank 250. This can have the benefit that the temperature sensor 210 is not in direct contact with the coolant and becomes easily accessible, e.g. for maintenance.
  • the flow of the coolant generated by the cooling unit depends on the true power value supplied to the cooling unit.
  • the predetermined true power threshold value can be a function of temperature.
  • the predetermined true power threshold value can depend on parameters such as the characteristics of the cooling unit including the type of the cooling unit, the rated power value of the cooling unit, the type of coolant used, the viscosity of the coolant, or the temperature of the coolant. For example, different cooling units may have different performance specifications. Moreover, the viscosity of the coolant may be temperature dependent. Thus, the viscosity may become lower with increased temperature.
  • the temperature for adjusting the predetermined threshold value may be chosen in embodiments to be more than -40°C. In embodiments, the temperature may be chosen to be less than 140°C.
  • a cooling unit may consume less true power when providing a coolant flow of a coolant having a lower viscosity, compared to a coolant having a higher viscosity.
  • the predetermined true power threshold value may then be adjusted according to the temperature of the coolant.
  • the predetermined true power threshold value are smaller for higher temperature values, as also shown hereinafter in Fig. 3 .
  • the temperature of the coolant can be measured indirectly by measuring the temperature of the transformer, e.g. the temperature of the outer wall of the transformer tank or by measuring inside welded thermowells.
  • the controller 130 has access to a data storage.
  • the data storage may, for example, be included in the controller 130.
  • the controller 130 may also be connected to a data storage provided outside of the controller 130.
  • the information of the predetermined true power threshold value may be stored on the data storage.
  • the controller 130 can, for example, compare the detected true power value with a predetermined true power threshold value by using the information stored on the data storage.
  • the detected true power value is compared with a predetermined true power threshold value.
  • the value of the predetermined true power threshold value is in relation to a desired operational condition of the transformer. For example, if the detected true power value is lower than the predetermined true power threshold value, it could be considered that the transformer is not in a desired operational condition.
  • the cooling unit may have a malfunction.
  • a part of the cooling circuit may not be in an operational state such as, for example, a valve of the cooling circuit being closed. The flow of the coolant may then be considered as not sufficient for cooling the transformer. If the detected true power value is above the predetermined true power threshold value, it could be considered that the flow of the coolant is sufficient for cooling the transformer.
  • the predetermined true power threshold value is provided as a lookup table.
  • This can be understood as a lookup table having a plurality of predetermined true power threshold values, wherein the plurality of predetermined threshold values have at least one additional parameter, such as, for example, the measured temperature of the transformer, the type of cooling unit, the coolant type used therein, or combinations thereof Accordingly, the predetermined true power threshold value used for comparison with the detected true power value is selected based on the at least one parameter.
  • the predetermined true power threshold value may be a true power value for which the transformer is considered to be in a desired operational condition.
  • the cooling unit is considered to be in a desired operational condition, if a measured true power has the value of the predetermined true power threshold value.
  • the inventors have found that from a power consumption point of view, it can be detected whether a cooling unit such as, for example, a pump, is working abnormally and thus is not providing a sufficient flow of a coolant such as, for example, an oil flow.
  • the power consumption is related to the supplied true power value.
  • the operational state of components of the cooling unit e.g. an electric motor
  • the phase difference may typically affect the power factor.
  • impairments of the motor windings may alter the power factor of the cooling unit and affect the true power value of the cooling unit.
  • An obstruction inside the cooling circuit interfering with the coolant flow such as, for example, a closed valve, may also alter the true power value of the cooling unit. This may be caused, for example, by an impeded rotating mechanism of the cooling unit.
  • Fig. 3 shows a graph illustrating the effect on the true power value.
  • the graph shows the true power value as a function of temperature.
  • the graph has an axis 310 for the value of the true power and an axis 320 for the temperature value.
  • Fig. 3 displays a first graph 330 and a second graph 340.
  • the first graph 330 has a lower true power value over the shown temperature range than the second graph 340.
  • the true power value of the second graph 340 is higher than the true power value of the first graph 330 independently of the temperature value.
  • the first graph 330 and the second graph 340 do not intersect one another over a certain temperature range, in particular, at least over a certain temperature range relevant for operating transformers.
  • a temperature of the transformer is detected.
  • the predetermined true power threshold value can be temperature-adjusted based on the detected temperature of the transformer.
  • the detector 120 measures the true power value supplied to the cooling unit 110.
  • the second graph 340 of Fig. 3 shows the measured true power values at different temperatures.
  • the first graph 330 represents the predetermined true power threshold value.
  • the predetermined true power threshold value is temperature dependent, e.g. the value of the first graph 330 becomes lower with increasing temperature.
  • the cooling unit provides a sufficient flow of coolant for cooling the transformer.
  • the first graph 330 represents the detected true power
  • the second graph 340 represents the predetermined true power threshold value. Accordingly, for a given temperature, in particular, for a measured temperature measured by the temperature sensor 210, the detected true power value has in this second example case a lower value than the predetermined true power threshold value. Therefore, in this second example case, it is considered that the coolant flow is not sufficient to cool the transformer.
  • the temperature sensor 210 arranged within welded thermowells can measure the temperature of the transformer 200.
  • the temperature sensor 210 is typically in communication (i.e. signal or data communication) with the controller 130 (and vice versa).
  • the temperature sensor 210 is connected by a signaling line 230 for transmitting the measured temperature data.
  • the temperature sensor 210 can have an analog or a digital output for sending data to the controller 130.
  • comparing the detected true power threshold value includes measuring the true power value supplied to the cooling unit such as, for example, a true power consumed by an oil pump, wherein the comparison is coupled with a temperature measure. Hence, it could be detected whether a minimum flow of a coolant such as, for example, an oil flow, is provided.
  • Fig. 4 shows a chart illustrating a method 400 of operating a transformer 200 according to embodiments described herein.
  • a flow of a coolant along a cooling path 170 is generated by the cooling unit 110 (box 410).
  • flow of the coolant is generated by the cooling unit 110 for forced cooling of the transformer 200.
  • a true power value supplied to the cooling 110 is measured.
  • the detected true power value is compared with a predetermined true power threshold value in step 430.
  • the method further includes detecting, based on the comparison of the detected true power value and the predetermined true power threshold value, whether the cooling unit 110 is in a desired operational condition (box 440).
  • the predetermined true power threshold value may be a function of temperature.
  • the predetermined threshold value may be then adjusted based on the detected temperature of the transformer. Accordingly, the method according to embodiments described herein can further include comparing the detected true power value with a temperature adjusted predetermined true power threshold value (box 450).
  • the cooling unit 110 can be a circulating pump adapted to generate a flow 150 of a transformer cooling fluid circulating in a cooling circuit 220 of the transformer 200, as exemplarily shown in Fig. 2 .
  • the transformer may include a second cooling unit for forced cooling of the transformer.
  • the second cooling unit may be adapted to generate a second flow of a coolant along a second cooling path for forced cooling of the transformer.
  • a second true power value supplied to the second cooling unit may be measured.
  • the detected second true power value may be then compared with a predetermined second true power threshold value.
  • the second cooling unit can be a cooling fan generating an air flow for forced air cooling of the transformer.
  • Embodiments of the present disclosure may be used for transformers such as, for example, 3-phase transformers, e.g. for distribution or the like, single-phase transformers, in particular single phase traction transformers, measurement transformers, insulation transformers for traction, auxiliary, double insulation or the like, or for transformers integrated in power electronic converters, such as, for example, a power-electronic traction transformer.
  • transformers such as, for example, 3-phase transformers, e.g. for distribution or the like, single-phase transformers, in particular single phase traction transformers, measurement transformers, insulation transformers for traction, auxiliary, double insulation or the like, or for transformers integrated in power electronic converters, such as, for example, a power-electronic traction transformer.
  • Embodiments of the present disclosure may also be used for liquid-cooled inductors.
  • the coolant flow detecting device 100 may further include a network interface for connecting the device to a data network, in particular a global data network.
  • the data network may be a TCP/IP network such as Internet.
  • the controller 130 of the coolant flow detecting device 100 may be operatively connected to the network interface for carrying out commands received from the data network.
  • the commands may include a control command for controlling the transformer, the cooling unit 110, or for performing tasks such as, for example, monitoring the coolant flow 150 by measuring the true power value supplied to the cooling unit 110, receiving data from the controller 130, sending data to the controller 130.
  • the controller 130 is adapted for carrying out the task in response to the control command received from the data network.
  • the commands may include a status request.
  • the controller 130 may be adapted for sending a status information to the network interface, and the network interface is then adapted for sending the status information over the network.
  • the commands may include an update command including update data.
  • the controller 130 is adapted for initiating an update in response to the update command and using the update data.
EP17168820.3A 2017-04-28 2017-04-28 Procédé de fonctionnement d'un transformateur et appareil pour un transformateur Withdrawn EP3396688A1 (fr)

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JP2019054057A (ja) * 2017-09-13 2019-04-04 中国電力株式会社 監視装置及び監視システム
CN109817417A (zh) * 2019-03-06 2019-05-28 杨扬 一种用于新能源电动汽车的变压器

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JPS59227109A (ja) * 1983-06-09 1984-12-20 Toshiba Corp 変圧器の冷却器制御方式
EP1085534A2 (fr) * 1999-09-17 2001-03-21 General Electric Company Système intelligent et méthode d'analyse pour un équipement électrique remplis de liquide
EP1470948A1 (fr) * 2003-04-22 2004-10-27 ABB Sécheron SA Transformateur de traction et procédé pour surveiller l'état de fonctionnement du transformateur de traction
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CN109817417A (zh) * 2019-03-06 2019-05-28 杨扬 一种用于新能源电动汽车的变压器
CN109817417B (zh) * 2019-03-06 2020-12-22 杨扬 一种用于新能源电动汽车的变压器

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