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EP3355323A1 - Ensemble de refroidissement pour un ensemble à haute tension et procédé pour faire fonctionner un ensemble de refroidissement pour un ensemble à haute tension - Google Patents

Ensemble de refroidissement pour un ensemble à haute tension et procédé pour faire fonctionner un ensemble de refroidissement pour un ensemble à haute tension Download PDF

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Publication number
EP3355323A1
EP3355323A1 EP17153608.9A EP17153608A EP3355323A1 EP 3355323 A1 EP3355323 A1 EP 3355323A1 EP 17153608 A EP17153608 A EP 17153608A EP 3355323 A1 EP3355323 A1 EP 3355323A1
Authority
EP
European Patent Office
Prior art keywords
assembly
cooling assembly
flow rate
volumetric flow
high voltage
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Withdrawn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
EP17153608.9A
Other languages
German (de)
English (en)
Inventor
Tobias Stirl
Günther Hoba
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.)
General Electric Technology GmbH
Original Assignee
General Electric Technology GmbH
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 General Electric Technology GmbH filed Critical General Electric Technology GmbH
Priority to EP17153608.9A priority Critical patent/EP3355323A1/fr
Priority to PCT/EP2018/051722 priority patent/WO2018138145A1/fr
Publication of EP3355323A1 publication Critical patent/EP3355323A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H01F27/12—Oil cooling

Definitions

  • the present invention relates to a cooling assembly for a high voltage assembly and to a method to operate the cooling assembly.
  • Known high voltage assemblies like oil immersed power transformers or oil immersed reactors comprise a cooling assembly which is adapted to an expected ambient temperature range and adapted to the configuration of the high voltage assembly. Furthermore, it is known that such a cooling assembly comprises a pump which comprises an on-state and an off-state only.
  • a cooling assembly for connecting to a compartment of a high voltage assembly via a flow line and a return line, the cooling assembly comprises a heat exchange assembly adapted to dissipate heat from the insulation liquid to the environment; and a pump arranged at the flow line or the return line and being operable at variable speeds.
  • the cooling power of the heat exchange assembly can be adapted as it is available a continuously variable speed control of the pump. Therefore, the cooling performance can be optimized and an increase in overload capacity is possible. Furthermore, unnecessary losses are avoided as the pump can be operated at less than 100 % of the possible speed. Also inrush currents are limited as the variable speed control allows starting the pump with a low speed.
  • the proposed cooling assembly also provides to decrease weight and dimension of the cooling assembly as forced circulation through the cooling assembly does not rely on natural convection which would implicate large surfaces exposed to the environment.
  • a further advantage relies in standardization, which means that one type of pump can be used for a plurality of speed and sound requirements. Consequently, one type of pump can be used for a plurality of types of high voltage assemblies. This has also an advantageous impact on the reduction of service and maintenance costs.
  • An advantageous embodiment is characterized in that a target volumetric flow rate of the insulation liquid is determined, wherein the speed of the pump is controlled in dependence on the target volumetric flow rate.
  • An advantageous embodiment is characterized in that the target volumetric flow rate is determined in dependence on a load current of the high voltage assembly. Consequently, temperature variations of the insulation liquid over time can be reduced. This results in less breathing of the high voltage assembly which has a positive effect on ageing of the whole oil/paper-insulation. Therefore life expectancy of the whole high voltage assembly is increased.
  • An advantageous embodiment is characterized in that the target volumetric flow rate is determined in dependence on a temperature of the insulation liquid. Consequently, temperature variations of the insulation liquid over time can be reduced. This results in less breathing of the high voltage assembly which has a positive effect on ageing of the whole oil/paper-insulation. Therefore life expectancy of the whole high voltage assembly is increased.
  • An advantageous embodiment is characterized in that the target volumetric flow rate is determined to a base rate if the temperature and/or the load current falls below a threshold.
  • the base rate advantageously provides that any failure of the pump can be detected and resolved immediately.
  • the insulation liquid remains in circulation.
  • sound emissions of the pump or cooling fans are reduced when compared to a singular on-state.
  • An advantageous embodiment is characterized in that the target volumetric flow rate is determined in dependence on a characteristic curve linking the target volumetric flow rate and the temperature of the insulation liquid or the target volumetric flow rate and the load current.
  • An advantageous embodiment is characterized in that the characteristic curve comprises partly a linear relationship between the target volumetric flow rate and the temperature of the insulation liquid or the target volumetric flow rate and the load current.
  • An advantageous embodiment is characterized in that the target volumetric flow rate is determined in dependence on a manual input of a manual input unit, wherein the manual input overrides the calculated target volumetric flow rate. Therefore, manual operation is advantageously is still possible.
  • An advantageous embodiment is characterized in that the target volumetric flow rate is determined by a closed loop control. A further reduction in temporal drift of the temperature of the insulation liquid can be achieved.
  • cooling assembly comprises a radiator, and wherein the pump is a propeller pump.
  • cooling assembly comprises an oil-to-air-cooler or an oil-to-water cooler, and wherein the pump is an inline pump.
  • a high voltage assembly comprising the proposed cooling assembly, and the compartment containing an active component surrounded by the insulation liquid, wherein the cooling assembly is connected with the compartment via the flow line and the return line.
  • Another aspect of this disclosure is directed to a method to operate a cooling assembly for a high voltage assembly being connected to a compartment of the high voltage assembly via a flow line and a return line, the cooling assembly comprising: a heat exchange assembly adapted to dissipate heat from the insulation liquid to the environment; and the method comprising operating a pump arranged at the flow line or the return line at variable speeds.
  • a further aspect of this disclosure is directed to a control unit configured to execute the proposed method.
  • FIG. 1 shows a schematic depiction of a cooling assembly 2 for a high voltage assembly.
  • the cooling assembly 2 is adapted to be connected to a compartment of the high voltage assembly via a flow line 4 and a return line 6.
  • a heat exchange assembly 8 is adapted to dissipate heat from an insulation liquid 10 passing through the heat exchange assembly 8 to the environment 12.
  • a pump 14 is arranged at the flow line 4 and is operable at variable speeds.
  • Figure 2 shows a further schematic cooling assembly 2 for a high voltage assembly. With difference to figure 1 the pump 14 is arranged at the return line 6.
  • FIG. 3 shows schematic depiction of the high voltage assembly 16.
  • the high voltage assembly 16 is for example a high voltage transformer or a high voltage reactor.
  • the heat exchange assembly 8 comprises a heat dissipating component 9 like a radiator or an oil-to-air-cooler or an oil-to-water-cooler.
  • the heat exchange assembly 8 realizes an insulation liquid path 11 to ingest high temperature insulation liquid 10 and to emit low temperature insulation liquid 10 into the compartment 18.
  • an active component 20 comprising a core and windings.
  • the active component 20 is surrounded by the insulation liquid 10.
  • An inlet 22 of the flow line 4 is arranged at an upper part 24 of the compartment 18.
  • An outlet 26 of the return line 6 is arranged at a bottom part 28 of the and inside the compartment 18.
  • the outlet 26 is arranged below the active component 20.
  • the outlet 26 can be arranged outside an area below the active component 20.
  • the outlet 26 can be arranged to pass at least partly through the active component 20.
  • a controller 30 is configured to determine a target volumetric flow rate ft. To determine the target volumetric flow rate ft the controller 30 comprises a processor P and memory MEM. A temperature sensor 32 is arranged at the flow line 4 to determine a temperature T of the insulation liquid 10 passing through the flow line 4.
  • the temperature sensor 32 can be arranged at another position of the high voltage assembly 16.
  • a unit 34 is configured to determine a load current I of the high voltage assembly 16.
  • the unit 34 can be a sensor or a further control unit.
  • a manual input unit 36 determines a manual input M.
  • the controller 30 is configured to determine the target volumetric flow rate ft in dependence on the temperature T and/or the load current I and/or in dependence on the manual input M.
  • the pump 14 comprises power electronics 38 to which the target volumetric flow rate ft is applied.
  • the power electronics 38 is configured to translate the applied target volumetric flow rate ft to a corresponding speed of the pump 14.
  • the high voltage assembly 16 comprises a plurality of cooling assemblies 2, each cooling assembly 2 being connected to the single compartment 18 via a respective flow line 4 and a respective return line 6.
  • the plurality of assemblies 2 is connected to the single compartment 19 via an at least partly conjoint flow line 4 and an at least partly conjoint return line 6.
  • the cooling of the insulation liquid 10 is assured by redundant cooling assemblies 2.
  • FIG. 4 shows schematic block diagram of open-loop control.
  • the temperature T is supplied to a characteristic curve 40 and a corresponding target volumetric flow rate ft is determined and applied to the pump 14.
  • Figure 5 shows the characteristic curve 40 in a schematic way.
  • the target volumetric flow rate ft remains constant at a base rate ftB.
  • a linear relationship between the temperature T and the target volumetric flow rate ft applies.
  • a threshold Tth divides the temperature areas TA and TB.
  • the relationship between the temperature T and the target volumetric flow rate ft can depart from the linear relationship in the temperature area TB.
  • Figure 6 shows schematic block diagram of open-loop control.
  • the load current I is supplied to a characteristic curve 42.
  • a target volumetric flow rate ft corresponding to the load current I is determined and applied to the pump 14.
  • Figure 7 shows the characteristic curve 42 in a schematic way.
  • a first load current area IA the target volumetric flow rate ft remains constant at a base rate ftB.
  • a second load current area TB a linear relationship between the load current I and the target volumetric flow rate ft applies.
  • a threshold Ith divides the load current areas IA and IB.
  • relationship between the load current I and the target volumetric flow rate ft can depart from the linear relationship in the load current area IB.
  • FIG. 8 shows a schematic block diagram of a closed loop control.
  • a block 44 determines a setpoint value Ts as a desired value for the temperature of the insulation liquid 10 inside the compartment 18 or a temperature of the insulation liquid 10 at the temperature sensor 32.
  • a difference D is determined by subtracting the temperature T from the setpoint value Ts.
  • the difference d is applied to a controller 48, for example a proportional plus integral plus derivative element.
  • the controller 48 determines the target volumetric flow rate ft in dependence on the difference D and applies it to the pump 14.
  • the operation of the pump 14 at variable speeds has an impact on the whole high voltage assembly 16 which can be measured by the temperature T.
  • Figure 9 shows a schematic flow diagram to operate the cooling assembly 2.
  • the pump 14 is operated at variable speeds.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Transformer Cooling (AREA)
EP17153608.9A 2017-01-27 2017-01-27 Ensemble de refroidissement pour un ensemble à haute tension et procédé pour faire fonctionner un ensemble de refroidissement pour un ensemble à haute tension Withdrawn EP3355323A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP17153608.9A EP3355323A1 (fr) 2017-01-27 2017-01-27 Ensemble de refroidissement pour un ensemble à haute tension et procédé pour faire fonctionner un ensemble de refroidissement pour un ensemble à haute tension
PCT/EP2018/051722 WO2018138145A1 (fr) 2017-01-27 2018-01-24 Ensemble de refroidissement d'ensemble haute tension et procédé de mise en œuvre d'un ensemble de refroidissement d'ensemble haute tension

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17153608.9A EP3355323A1 (fr) 2017-01-27 2017-01-27 Ensemble de refroidissement pour un ensemble à haute tension et procédé pour faire fonctionner un ensemble de refroidissement pour un ensemble à haute tension

Publications (1)

Publication Number Publication Date
EP3355323A1 true EP3355323A1 (fr) 2018-08-01

Family

ID=57914853

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17153608.9A Withdrawn EP3355323A1 (fr) 2017-01-27 2017-01-27 Ensemble de refroidissement pour un ensemble à haute tension et procédé pour faire fonctionner un ensemble de refroidissement pour un ensemble à haute tension

Country Status (2)

Country Link
EP (1) EP3355323A1 (fr)
WO (1) WO2018138145A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210020346A1 (en) * 2019-07-17 2021-01-21 Siemens Aktiengesellschaft Method for Operating a Cooling System of a Transformer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116110687A (zh) * 2022-12-08 2023-05-12 广东明阳电气股份有限公司 一种植物油变压器控制装置及控制方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6446027B1 (en) * 1999-09-17 2002-09-03 General Electric Company Intelligent analysis system and method for fluid-filled electrical equipment
US20040158428A1 (en) * 2003-02-06 2004-08-12 Byrd Douglas S. Intelligent auxiliary cooling system
EP1750360A1 (fr) * 2005-08-03 2007-02-07 ABB Research Ltd Dispostif de convertisseur à plusieurs niveaux et son utilisation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6446027B1 (en) * 1999-09-17 2002-09-03 General Electric Company Intelligent analysis system and method for fluid-filled electrical equipment
US20040158428A1 (en) * 2003-02-06 2004-08-12 Byrd Douglas S. Intelligent auxiliary cooling system
EP1750360A1 (fr) * 2005-08-03 2007-02-07 ABB Research Ltd Dispostif de convertisseur à plusieurs niveaux et son utilisation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210020346A1 (en) * 2019-07-17 2021-01-21 Siemens Aktiengesellschaft Method for Operating a Cooling System of a Transformer

Also Published As

Publication number Publication date
WO2018138145A1 (fr) 2018-08-02

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