EP3404678A1 - High voltage assembly and method to operate the high voltage assembly - Google Patents

High voltage assembly and method to operate the high voltage assembly Download PDF

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Publication number
EP3404678A1
EP3404678A1 EP17171508.9A EP17171508A EP3404678A1 EP 3404678 A1 EP3404678 A1 EP 3404678A1 EP 17171508 A EP17171508 A EP 17171508A EP 3404678 A1 EP3404678 A1 EP 3404678A1
Authority
EP
European Patent Office
Prior art keywords
sealed compartment
conservator
high voltage
voltage assembly
cover
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.)
Granted
Application number
EP17171508.9A
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German (de)
French (fr)
Other versions
EP3404678B1 (en
Inventor
Jörg HARTHUM
Tobias Stirl
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
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General Electric Technology GmbH
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Filing date
Publication date
Application filed by General Electric Technology GmbH filed Critical General Electric Technology GmbH
Priority to EP17171508.9A priority Critical patent/EP3404678B1/en
Priority to PCT/EP2018/060661 priority patent/WO2018210544A1/en
Publication of EP3404678A1 publication Critical patent/EP3404678A1/en
Application granted granted Critical
Publication of EP3404678B1 publication Critical patent/EP3404678B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
    • 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

Definitions

  • the present invention relates to a high voltage assembly and method of operating the high voltage assembly.
  • Known high voltage assemblies like oil immersed transformers or oil immersed reactors comprise a conservator which is arranged above a cover of the compartment comprising an active component.
  • a transformer arrangement comprising a transformer tank for a liquid-filled electrical transformer, an expansion tank, and piping connecting the transformer tank with the expansion tank for enabling liquid of the liquid-filled transformer to flow between the transformer tank and the expansion tank via the piping.
  • the piping comprises a valve.
  • the valve is configured for allowing the liquid to flow from the transformer tank to the expansion tank when the pressure of the liquid in the transformer tank is above a predefined first threshold and for preventing the liquid to flow from the transformer tank to the expansion tank when the pressure of the liquid in the transformer tank is below the predefined first threshold.
  • the valve is also configured for allowing the liquid to flow from the expansion tank to the transformer tank when the pressure of the liquid in the transformer tank is below a predefined second threshold and for preventing the liquid to flow from the expansion tank to the transformer tank when the pressure of the liquid in the transformer tank is above the predefined second threshold.
  • a high voltage assembly comprising: a sealed compartment containing an active component at least partly surrounded by an insulation liquid; a free breathing conservator; a Buchholz relay arranged above a level of a cover of the sealed compartment; and a pipe arrangement comprising: a first pipe section connecting an inside of the sealed compartment at the cover of the sealed compartment to the Buchholz relay; and a second pipe section connecting the Buchholz relay with an inside of the free breathing conservator at a lower portion of the free breathing conservator, wherein in a normal operating state of the high voltage assembly a hydraulic diameter of the pipe arrangement is maintained constant. Moreover, in the normal operating state of the high voltage assembly the level of insulation liquid in the conservator is maintained below the level of the cover of the sealed compartment.
  • the proposed high voltage assembly allows a reduction in size due to a level of insulation liquid in the conservator below the cover of the sealed compartment. Specifically it is easier to maintain the necessary electrical clearances due to free space above the cover. Moreover the overall size can be reduced.
  • the Buchholz relay provides sufficient protection capabilities for the high voltage assembly. During transport the conservator can remain at its position and it is not necessary to remove it. Due to the constant hydraulic diameter of the pipe arrangement no further valve elements are necessary which are operated in the normal operating state. Therefore, costs with regard to maintenance and production are reduced.
  • An advantageous embodiment is characterized in that the second pipe section comprises a lower valve and an upper valve. Closing the second pipe section is therefore available for retaining insulation liquid in the second pipe section.
  • An advantageous embodiment is characterized in that the cover of the sealed compartment comprises a valve. This option allows for a well-defined draining of insulation liquid to the conservator.
  • An advantageous embodiment is characterized in that the sealed compartment and the free breathing conservator share a wall. A reduction in size and cost is achieved.
  • An advantageous embodiment is characterized in that the pipe arrangement comprises: a third pipe section connecting an inside of the sealed compartment and the lower portion of the free breathing conservator.
  • An advantageous embodiment is characterized in that the third pipe section comprises a pump for pumping insulation liquid from the free breathing conservator to the sealed compartment. Accordingly the high voltage assembly can be brought to a normal operating state with the sealed compartment filled with insulation liquid.
  • the high voltage assembly comprises: a sealed compartment containing an active component at least partly surrounded by an insulation liquid; a free breathing conservator; a Buchholz relay arranged above a level of a cover of the sealed compartment; and a pipe arrangement comprising: a first pipe section connecting an inside of the sealed compartment at the cover of the sealed compartment to the Buchholz relay; and a second pipe section connecting the Buchholz relay with an inside of the free breathing conservator at a lower portion of the free breathing conservator.
  • the method comprises: maintaining a hydraulic diameter of the pipe arrangement constant when operating the high voltage assembly in a normal operating state; and maintaining in the normal operating state of the high voltage assembly the level of insulation liquid in the conservator below the level of the cover of the sealed compartment.
  • An advantageous embodiment is characterized in that the method further comprises: shutdown the high voltage assembly to transfer the high voltage assembly to a maintenance state; transferring at least part of the insulation liquid from the sealed compartment to the conservator; conducting maintenance work; returning the at least part of the insulation liquid from the conservator to the sealed compartment; switching on the high voltage assembly to return to normal operating state. No extra-volume for receiving insulation liquid during maintenance operation is necessary and consequently reduces maintenance costs.
  • An advantageous embodiment is characterized in that the transferring further comprises: opening at least partly the cover of the sealed compartment. This allows that at least part of the insulation liquid flows into the volume of the conservator.
  • An advantageous embodiment is characterized in that the transferring further comprises: opening a third pipe section connecting an inside of the sealed compartment and the lower portion of the free breathing conservator. Even then the first or second pipe sections are closed or without liquid, a liquid exchange may be accomplished by the third pipe section.
  • An advantageous embodiment is characterized in that the transferring further comprises: closing the second pipe section. Insulation liquid can be therefore retained in the second pipe section which prevents air bubbles in the second pipe section due to the operation during maintenance.
  • An advantageous embodiment is characterized in that the returning further comprises: closing the cover of the sealed compartment. This seals the compartment for returning to the normal operating state.
  • An advantageous embodiment is characterized in that the returning further comprises: opening a venting valve of the Buchholz relay; pumping insulation liquid from the free breathing conservator to the sealed compartment until insulation liquid leaves the open venting valve; and closing the venting valve.
  • FIG. 1 shows a schematic high voltage assembly 2.
  • a sealed compartment 4 contains an active component 6 which is at least partly surrounded by insulation liquid 8.
  • the active component 6 comprises windings and a core.
  • a free breathing conservator 10 is arranged besides the sealed compartment 4. According to an embodiment the sealed compartment 4 and the free breathing conservator 10 share a wall, which is indicated by the arrows 15.
  • the cover 14 of the sealed compartment 4 comprises a valve 28.
  • the conservator 10 comprises a filter 11 for breathing dry air from the ambient air. Furthermore, the conservator 10 comprises a level indicator 13. A Buchholz relay 12 is arranged above a level L14 of a cover 14 of the sealed compartment 4. Especially, the Buchholz relay 12 is arranged at a vertical uppermost portion of a pipe arrangement 16.
  • a cover of the conservator 10 is arranged above the level L14 of the cover 14 of the sealed compartment 4. This guarantees a safety volume for receiving the insulation liquid when the high voltage assembly is under maintenance.
  • the pipe arrangement 16 connects the sealed compartment 4 and the conservator 10.
  • the pipe arrangement 16 comprises a first pipe section 18 connecting an inside of the sealed compartment 4 at the cover 14 of the sealed compartment 4 to the Buchholz relay 12.
  • a second pipe section 20 connects the Buchholz relay 12 with an inside of the free breathing conservator 10 at a lower portion 22 of the free breathing conservator 10.
  • the second pipe section 20 comprises a lower valve 24 and an upper valve 26.
  • the lower portion 22 comprises at least one third of the whole volume of the conservator 10.
  • N of the high voltage assembly 2 a hydraulic diameter of the pipe arrangement 16 remains constant.
  • the pipe arrangement 16 comprises a third pipe section 30 connecting an inside of the sealed compartment 4 and the lower portion 22 of the free breathing conservator 10. Dashed line 40 and valves 42 and 44 indicate that the third pipe section 30 is not necessary to operate in the normal operating state N.
  • the valves 42, 44 are arranged to temporarily add an oil pump. In an embodiment the oil pump is arranged permanently in the third pipe section 30.
  • FIG. 2 shows the high voltage assembly 2 in a maintenance state M.
  • the third pipe section 30 comprises the pump 32 for pumping insulation liquid from the free breathing conservator 10 to the sealed compartment 4.
  • the pump 32 allows a flow of insulation liquid to the conservator 10 when not operating.
  • Figure 3 shows a schematic flow diagram to exemplify a method 300 to operate the high voltage assembly 2. According to the normal operating state N a hydraulic diameter of the pipe arrangement 16 is maintained 310 constant.
  • the high voltage assembly 2 is shutdown 320 in order to transfer the high voltage assembly 2 to a maintenance state M.
  • At least part of the insulation liquid from the sealed compartment 4 is transferred to the conservator 10 in a step 330.
  • the step 330 further comprises opening at least partly the cover 14 of the sealed compartment 4.
  • the step 330 further comprises opening the third pipe section 30 connecting an inside of the sealed compartment 4 and the lower portion 22 of the free breathing conservator 10.
  • the step 330 also comprises closing the second pipe section 20.
  • a step 340 the maintenance work is conducted. This may comprise, for example, changing or repairing one of the bushings 3A, 3B, and 3C.
  • a step 350 the at least part of the insulation liquid is returned from the conservator 10 to the sealed compartment 4.
  • the step 350 comprises closing the cover 14 of the sealed compartment 4.
  • the venting valve 34 of the Buchholz relay 12 is used: a) the venting valve 34 of the Buchholz relay is opened, b) insulation liquid is pumped by means of the pump 32 from the free breathing conservator 10 to the sealed compartment 4 until insulation liquid leaves the open venting valve 34; and c) closing the venting valve 34.
  • the high voltage assembly 2 is switched on 360 to return to normal operating state N.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformer Cooling (AREA)

Abstract

A high voltage assembly (2) comprises: - a sealed compartment (4) containing an active component (6) at least partly surrounded by an insulation liquid (8); - a free breathing conservator (10); - a Buchholz relay (12) arranged above a level (L14) of a cover (14) of the sealed compartment (4); and a pipe arrangement (16) comprising: - a first pipe section (18) connecting the interior of the sealed compartment (4) at the cover (14) of the sealed compartment (4) to the Buchholz relay (12); and - a second pipe section (20) connecting the Buchholz relay (12) with the interior of the free breathing conservator (10) at a lower portion (22) of the free breathing conservator (10), wherein in a normal operating state (N) of the high voltage assembly (2) a hydraulic diameter of the pipe arrangement (16) is maintained constant and the level of insulation liquid in the conservator (10) is maintained below the level (L14) of the cover (14) of the sealed compartment (4).

Description

    FIELD OF THE INVENTION
  • The present invention relates to a high voltage assembly and method of operating the high voltage assembly.
    • BACKGROUND OF THE INVENTION
  • Known high voltage assemblies like oil immersed transformers or oil immersed reactors comprise a conservator which is arranged above a cover of the compartment comprising an active component.
  • However, the area above the cover is very limited and has drawbacks with regard to safety and electrical clearance issues. High costs and an increase in dimension are the consequences.
  • From EP 3 109 871 A1 it is known a transformer arrangement comprising a transformer tank for a liquid-filled electrical transformer, an expansion tank, and piping connecting the transformer tank with the expansion tank for enabling liquid of the liquid-filled transformer to flow between the transformer tank and the expansion tank via the piping. The piping comprises a valve. The valve is configured for allowing the liquid to flow from the transformer tank to the expansion tank when the pressure of the liquid in the transformer tank is above a predefined first threshold and for preventing the liquid to flow from the transformer tank to the expansion tank when the pressure of the liquid in the transformer tank is below the predefined first threshold. The valve is also configured for allowing the liquid to flow from the expansion tank to the transformer tank when the pressure of the liquid in the transformer tank is below a predefined second threshold and for preventing the liquid to flow from the expansion tank to the transformer tank when the pressure of the liquid in the transformer tank is above the predefined second threshold.
    • SUMMARY OF THE INVENTION
  • In view of the prior art, it is an object of the present disclosure to improve a high voltage assembly of the above type.
  • According to a first aspect of this disclosure it is proposed a high voltage assembly comprising: a sealed compartment containing an active component at least partly surrounded by an insulation liquid; a free breathing conservator; a Buchholz relay arranged above a level of a cover of the sealed compartment; and a pipe arrangement comprising: a first pipe section connecting an inside of the sealed compartment at the cover of the sealed compartment to the Buchholz relay; and a second pipe section connecting the Buchholz relay with an inside of the free breathing conservator at a lower portion of the free breathing conservator, wherein in a normal operating state of the high voltage assembly a hydraulic diameter of the pipe arrangement is maintained constant. Moreover, in the normal operating state of the high voltage assembly the level of insulation liquid in the conservator is maintained below the level of the cover of the sealed compartment.
  • The proposed high voltage assembly allows a reduction in size due to a level of insulation liquid in the conservator below the cover of the sealed compartment. Specifically it is easier to maintain the necessary electrical clearances due to free space above the cover. Moreover the overall size can be reduced. The Buchholz relay provides sufficient protection capabilities for the high voltage assembly. During transport the conservator can remain at its position and it is not necessary to remove it. Due to the constant hydraulic diameter of the pipe arrangement no further valve elements are necessary which are operated in the normal operating state. Therefore, costs with regard to maintenance and production are reduced.
  • An advantageous embodiment is characterized in that the second pipe section comprises a lower valve and an upper valve. Closing the second pipe section is therefore available for retaining insulation liquid in the second pipe section.
  • An advantageous embodiment is characterized in that the cover of the sealed compartment comprises a valve. This option allows for a well-defined draining of insulation liquid to the conservator.
  • An advantageous embodiment is characterized in that the sealed compartment and the free breathing conservator share a wall. A reduction in size and cost is achieved.
  • An advantageous embodiment is characterized in that the pipe arrangement comprises: a third pipe section connecting an inside of the sealed compartment and the lower portion of the free breathing conservator. By this further liquid connection it is possible to exchange liquid in maintenance operation.
  • An advantageous embodiment is characterized in that the third pipe section comprises a pump for pumping insulation liquid from the free breathing conservator to the sealed compartment. Accordingly the high voltage assembly can be brought to a normal operating state with the sealed compartment filled with insulation liquid.
  • According to a further aspect of this disclosure it is proposed a method to operate a high voltage assembly. The high voltage assembly comprises: a sealed compartment containing an active component at least partly surrounded by an insulation liquid; a free breathing conservator; a Buchholz relay arranged above a level of a cover of the sealed compartment; and a pipe arrangement comprising: a first pipe section connecting an inside of the sealed compartment at the cover of the sealed compartment to the Buchholz relay; and a second pipe section connecting the Buchholz relay with an inside of the free breathing conservator at a lower portion of the free breathing conservator. The method comprises: maintaining a hydraulic diameter of the pipe arrangement constant when operating the high voltage assembly in a normal operating state; and maintaining in the normal operating state of the high voltage assembly the level of insulation liquid in the conservator below the level of the cover of the sealed compartment.
  • An advantageous embodiment is characterized in that the method further comprises: shutdown the high voltage assembly to transfer the high voltage assembly to a maintenance state; transferring at least part of the insulation liquid from the sealed compartment to the conservator; conducting maintenance work; returning the at least part of the insulation liquid from the conservator to the sealed compartment; switching on the high voltage assembly to return to normal operating state. No extra-volume for receiving insulation liquid during maintenance operation is necessary and consequently reduces maintenance costs.
  • An advantageous embodiment is characterized in that the transferring further comprises: opening at least partly the cover of the sealed compartment. This allows that at least part of the insulation liquid flows into the volume of the conservator.
  • An advantageous embodiment is characterized in that the transferring further comprises: opening a third pipe section connecting an inside of the sealed compartment and the lower portion of the free breathing conservator. Even then the first or second pipe sections are closed or without liquid, a liquid exchange may be accomplished by the third pipe section.
  • An advantageous embodiment is characterized in that the transferring further comprises: closing the second pipe section. Insulation liquid can be therefore retained in the second pipe section which prevents air bubbles in the second pipe section due to the operation during maintenance.
  • An advantageous embodiment is characterized in that the returning further comprises: closing the cover of the sealed compartment. This seals the compartment for returning to the normal operating state.
  • An advantageous embodiment is characterized in that the returning further comprises: opening a venting valve of the Buchholz relay; pumping insulation liquid from the free breathing conservator to the sealed compartment until insulation liquid leaves the open venting valve; and closing the venting valve. By conducting these steps it is assured that insulation liquid is present up to the Buchholz relay.
    • BRIEF DESCRIPTION OF THE DRAWINGS
    • Figures 1 and 2
    show a schematic high voltage assembly, respectively; and
    Figure 3
    shows a schematic flow diagram.
    DESCRIPTION OF THE EMBODIMENTS
  • Figure 1 shows a schematic high voltage assembly 2. A sealed compartment 4 contains an active component 6 which is at least partly surrounded by insulation liquid 8. The active component 6 comprises windings and a core. A free breathing conservator 10 is arranged besides the sealed compartment 4. According to an embodiment the sealed compartment 4 and the free breathing conservator 10 share a wall, which is indicated by the arrows 15. The cover 14 of the sealed compartment 4 comprises a valve 28.
  • The conservator 10 comprises a filter 11 for breathing dry air from the ambient air. Furthermore, the conservator 10 comprises a level indicator 13. A Buchholz relay 12 is arranged above a level L14 of a cover 14 of the sealed compartment 4. Especially, the Buchholz relay 12 is arranged at a vertical uppermost portion of a pipe arrangement 16.
  • According to an embodiment a cover of the conservator 10 is arranged above the level L14 of the cover 14 of the sealed compartment 4. This guarantees a safety volume for receiving the insulation liquid when the high voltage assembly is under maintenance.
  • The pipe arrangement 16 connects the sealed compartment 4 and the conservator 10. The pipe arrangement 16 comprises a first pipe section 18 connecting an inside of the sealed compartment 4 at the cover 14 of the sealed compartment 4 to the Buchholz relay 12.
  • A second pipe section 20 connects the Buchholz relay 12 with an inside of the free breathing conservator 10 at a lower portion 22 of the free breathing conservator 10. The second pipe section 20 comprises a lower valve 24 and an upper valve 26. The lower portion 22 comprises at least one third of the whole volume of the conservator 10. In a normal operating state N of the high voltage assembly 2 a hydraulic diameter of the pipe arrangement 16 remains constant.
  • The pipe arrangement 16 comprises a third pipe section 30 connecting an inside of the sealed compartment 4 and the lower portion 22 of the free breathing conservator 10. Dashed line 40 and valves 42 and 44 indicate that the third pipe section 30 is not necessary to operate in the normal operating state N. The valves 42, 44 are arranged to temporarily add an oil pump. In an embodiment the oil pump is arranged permanently in the third pipe section 30.
  • Figure 2 shows the high voltage assembly 2 in a maintenance state M. In the maintenance state M the third pipe section 30 comprises the pump 32 for pumping insulation liquid from the free breathing conservator 10 to the sealed compartment 4. In an embodiment the pump 32 allows a flow of insulation liquid to the conservator 10 when not operating.
  • Figure 3 shows a schematic flow diagram to exemplify a method 300 to operate the high voltage assembly 2. According to the normal operating state N a hydraulic diameter of the pipe arrangement 16 is maintained 310 constant.
  • The high voltage assembly 2 is shutdown 320 in order to transfer the high voltage assembly 2 to a maintenance state M. At least part of the insulation liquid from the sealed compartment 4 is transferred to the conservator 10 in a step 330. The step 330 further comprises opening at least partly the cover 14 of the sealed compartment 4. The step 330 further comprises opening the third pipe section 30 connecting an inside of the sealed compartment 4 and the lower portion 22 of the free breathing conservator 10. The step 330 also comprises closing the second pipe section 20.
  • In a step 340 the maintenance work is conducted. This may comprise, for example, changing or repairing one of the bushings 3A, 3B, and 3C.
  • In a step 350 the at least part of the insulation liquid is returned from the conservator 10 to the sealed compartment 4. The step 350 comprises closing the cover 14 of the sealed compartment 4. Also, the venting valve 34 of the Buchholz relay 12 is used: a) the venting valve 34 of the Buchholz relay is opened, b) insulation liquid is pumped by means of the pump 32 from the free breathing conservator 10 to the sealed compartment 4 until insulation liquid leaves the open venting valve 34; and c) closing the venting valve 34. Afterwards the high voltage assembly 2 is switched on 360 to return to normal operating state N.

Claims (14)

  1. A high voltage assembly (2) comprising:
    - a sealed compartment (4) containing an active component (6) at least partly surrounded by an insulation liquid (8);
    - a free breathing conservator (10);
    - a Buchholz relay (12) arranged above a level (L14) of a cover (14) of the sealed compartment (4); and
    a pipe arrangement (16) comprising:
    - a first pipe section (18) connecting the interior of the sealed compartment (4) at the cover (14) of the sealed compartment (4) to the Buchholz relay (12); and
    - a second pipe section (20) connecting the Buchholz relay (12) with the interior of the free breathing conservator (10) at a lower portion (22) of the free breathing conservator (10), wherein in a normal operating state (N) of the high voltage assembly (2), a hydraulic diameter of the pipe arrangement (16) is maintained (310) constant and the level of insulation liquid in the conservator (10) is maintained (312) below the level (L14) of the cover (14) of the sealed compartment (4).
  2. The high voltage assembly (2) according to claim 1, wherein the second pipe section (20) comprises a lower valve (24) and an upper valve (26).
  3. The high voltage assembly (2) according to claim 1 or 2, wherein the cover (14) of the sealed compartment (4) comprises a valve (28).
  4. The high voltage assembly (2) according to any one of the preceding claims, wherein the sealed compartment (4) and the free breathing conservator (10) share a wall.
  5. The high voltage assembly (2) according to claim 1 or 2, wherein the pipe arrangement (16) comprises:
    - a third pipe section (30) connecting the interior of the sealed compartment (4) and the lower portion (22) of the free breathing conservator (10).
  6. The high voltage assembly (2) according to claim 5, wherein the third pipe section (30) comprises a pump (32) for pumping insulation liquid from the free breathing conservator (10) to the sealed compartment (4).
  7. The high voltage assembly (2) according to claim 6, wherein the third pipe section (30) comprises the pump (32) for pumping insulation liquid from sealed compartment (4) to the free breathing conservator (10).
  8. A method (300) for operating a high voltage assembly (2), wherein the high voltage assembly (2) comprises:
    - a sealed compartment (4) containing an active component (6) at least partly surrounded by an insulation liquid (8);
    - a free breathing conservator (10);
    - a Buchholz relay (12) arranged above a level (L14) of a cover (14) of the sealed compartment (4); and
    a pipe arrangement (16) comprising:
    - a first pipe section (18) connecting an inside of the sealed compartment (4) at the cover (14) of the sealed compartment (4) to the Buchholz relay (12); and
    - a second pipe section (20) connecting the Buchholz relay (12) with an inside of the free breathing conservator (10) at a lower portion (22) of the free breathing conservator (10); wherein the method comprises:
    - maintaining (310) a hydraulic diameter of the pipe arrangement (16) constant when operating the high voltage assembly (2) in a normal operating state (N); and
    - maintaining (312) the level of insulation liquid in the conservator (10) below the level (L14) of the cover (14) of the sealed compartment (4) in the normal operating state (N) of the high voltage assembly (2).
  9. The method (300) according to claim 8, the method further comprising:
    - shutting down (320) the high voltage assembly (2) to transfer the high voltage assembly (2) to a maintenance state (M);
    - transferring (330) at least part of the insulation liquid from the sealed compartment (4) to the conservator (10);
    - conducting (340) maintenance work on the high voltage assembly (2);
    - returning (350) the transferred at least part of the insulation liquid from the conservator (10) to the sealed compartment (4);and
    - switching on (360) the high voltage assembly (2) to return to normal operating state (N).
  10. The method (300) according to claim 9, wherein the transferring (330) further comprises:
    - opening at least partly the cover (14) of the sealed compartment (4).
  11. The method (300) according to claim 8, 9 or 10, the transferring (330) further comprising:
    - opening a third pipe section (30) connecting the sealed compartment (4) and the lower portion (22) of the free breathing conservator (10).
  12. The method (300) of claim 8, 9, 10 or 11, the transferring (330) further comprising:
    - closing the second pipe section (20).
  13. The method (300) according to any one of claims 8 to 12, wherein the returning (350) further comprises:
    - closing the cover (14) of the sealed compartment.
  14. The method (300) according to any one of the claims 8 to 13, wherein the returning (350) further comprises:
    - opening a venting valve (34) of the Buchholz relay (12);
    - pumping insulation liquid from the free breathing conservator (10) to the sealed compartment (4) until insulation liquid leaves the open venting valve (34); and
    - closing the venting valve (34).
EP17171508.9A 2017-05-17 2017-05-17 High voltage assembly and method to operate the high voltage assembly Active EP3404678B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP17171508.9A EP3404678B1 (en) 2017-05-17 2017-05-17 High voltage assembly and method to operate the high voltage assembly
PCT/EP2018/060661 WO2018210544A1 (en) 2017-05-17 2018-04-26 High voltage assembly and method to operate the high voltage assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17171508.9A EP3404678B1 (en) 2017-05-17 2017-05-17 High voltage assembly and method to operate the high voltage assembly

Publications (2)

Publication Number Publication Date
EP3404678A1 true EP3404678A1 (en) 2018-11-21
EP3404678B1 EP3404678B1 (en) 2021-06-30

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WO (1) WO2018210544A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3876247A1 (en) * 2020-03-04 2021-09-08 General Electric Technology GmbH Sealing apparatus for a liquid-filled electrical equipment and associated assembly

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB693448A (en) * 1950-10-10 1953-07-01 British Electric Transformer C Improvements in or relating to electric power transformers
FR84247E (en) * 1963-09-02 1964-12-24 Alsthom Cgee Further training in electrical transformer stations
US20080197955A1 (en) * 2005-07-17 2008-08-21 Siemens Aktiengesellschaft Hermetically Sealed Electrical Apparatus
EP3109871A1 (en) 2015-06-25 2016-12-28 ABB Technology Ltd Transformer arrangement and method for controlling pressure in a liquid-filled transformer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB693448A (en) * 1950-10-10 1953-07-01 British Electric Transformer C Improvements in or relating to electric power transformers
FR84247E (en) * 1963-09-02 1964-12-24 Alsthom Cgee Further training in electrical transformer stations
US20080197955A1 (en) * 2005-07-17 2008-08-21 Siemens Aktiengesellschaft Hermetically Sealed Electrical Apparatus
EP3109871A1 (en) 2015-06-25 2016-12-28 ABB Technology Ltd Transformer arrangement and method for controlling pressure in a liquid-filled transformer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3876247A1 (en) * 2020-03-04 2021-09-08 General Electric Technology GmbH Sealing apparatus for a liquid-filled electrical equipment and associated assembly

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EP3404678B1 (en) 2021-06-30
WO2018210544A1 (en) 2018-11-22

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