CN110534293A

CN110534293A - A kind of fault-tolerant underwater transformer

Info

Publication number: CN110534293A
Application number: CN201910891126.5A
Authority: CN
Inventors: 孙昊
Original assignee: Xuzhou Keao Electric Co Ltd
Current assignee: Xuzhou Keao Electric Co Ltd
Priority date: 2019-09-20
Filing date: 2019-09-20
Publication date: 2019-12-03

Abstract

The invention discloses a kind of fault-tolerant underwater transformers comprising the arrangement of two tanks of an installation on top of the other.Bottom container accommodates the core of winding and transformer, and is located at the lower section of upper can and leans against in upper can.Two tanks are equipped with corresponding dielectric oil.Electric terminal for mainly connecting with secondary power sources is located at second container or instrument box, and conductor passes through instrument box, then reaches transformer tank by common wall.The design allows single wall part and improved transformer Cooling by bottom container.

Description

A kind of fault-tolerant underwater transformer

Technical field

The present invention relates to transformer technology field, specially a kind of fault-tolerant underwater transformer.

Background technique

Background technique is in submarine oil and gas industry, it is usually desirable to execute certain fluid processing on sea bed and live It is dynamic.Example includes fluid pump (single-phase and multiphase) and compressor (gas compressor and " moisture " compressor).Subsea pump and compression Machine usually by motor drive, powered by one or more umbilical cables from ground installation by three-phase power by motor. Especially in the case where umbilical cable is relatively long, it is desirable to transmit electric energy by umbilical cable with high voltage and use seabed The voltage that transformer pressure-reducing is used to suitable seabed motor.

Background technique seabed transformer part is normally submerged in the transformer oil being contained in tank.However, tank skin is logical It crosses a little, such as is electrically connected with power supply and load conductor, be the potential source of trouble.In order to improve reliability, some seabed transformations Device has used " tank in tank " to arrange, schematically shows in Fig. 1.10. in some cases, being answered using commonly used in surface Then the standard transformer case used is enclosed in the second outer container as interior case.Therefore, the design of tank inner canister is

The transformer of double barrier and core can be provided between seawater and active component (winding).

Summary of the invention

There is provided the content of present invention is to introduce further conceptual choice and describe in the following detailed description.This abstract The essential characteristic of the crucial theme claimed of identification unintentionally is not intended to and is used as auxiliary limitation theme claimed Range.

Describe a kind of seabed transformer comprising: one group of main coils winding;Second group of coil windings;And by The first hermetically sealed can that one tank skin limits accommodate one group and two groups of coil windings and the first dielectric oil shower primary and secondary coil around Group.The first tank skin is configured for disposing for a long time in subsea environment.Transformer further includes second hermetically sealed can of a, accommodates second Dielectric oil, and it is located at second hermetically sealed can the first hermetically sealed can nearby, so that the first and second tanks share a part of the first tank skin; A kind of one be mounted on the second tank group main terminal is connected to the first electric device and leads to first group of coil windings and pass through second The conducting path of a slot, the common sparing and first tank of first tank skin.Transformer further comprises one group and is mounted on second Auxiliary terminal on tank is connected to the second tank electrical conductivity path to secondary coil winding and passes through second water tank, and first The common sparing of water tank wall, and enter first water tank.

According to some embodiments, the common sparing of the first tank skin less than the first tank total surface area about 50%, and The non-shared part of one tank skin, which is configured to directly contact with environment, provides cooling seawater for first layer dielectric oil.According to some realities Apply example, the common sparing of the first tank skin less than the first tank total surface area about 30%.When (1) seawater leaks into second water tank But do not leaked between first and second water tank, or between (2) first and second water tank exist leakage but seawater do not have When leaking into second water tank, seabed transformer can remain operational tank.

According to some embodiments, transformer further include: first pressure compensator is in fluid communication and constructs with the first tank At the ambient seawater pressure and/or pressure in the internal pressure and the second tank of the first tank of balance;Second pressure compensator, with second Tank is in fluid communication, and is configured to the internal pressure and ambient seawater pressure of the second tank of balance.First pressure compensator can accommodate In the second tank.

According to some embodiments, instrument can be contained in the second tank, and the temperature sensor in the first tank can be used In the temperature for measuring the first dielectric oil.According to some embodiments, integrated high resistance grounding system is contained in the first tank, interconnection And it is configured to provide high resistance grounding path between the neutral node and ground of secondary windings.According to some other embodiments, base The exterior section of seabed transformer can be installed in the high resistance grounding system of seawater and is exposed to ambient seawater.

Transformer can be configured to the subsea motor power supply for handling the hydrocarbon-containifluids fluids generated from subterranean strata.Seabed Motor can be used for driving undersea device, such as subsea pump, compressor or separator.

Detailed description of the invention

Fig. 1 is the diagram for showing the subsea environment in accordance with some embodiments for wherein disposing fault-tolerant seabed transformer;

Fig. 2 is the perspective view of fault-tolerant seabed transformer in accordance with some embodiments;

Fig. 3 A and 3B are the cross-sectional views for showing the various assemblies and aspect of fault-tolerant seabed transformer in accordance with some embodiments;

Fig. 4,5,6 and 7 be the top view of fault-tolerant seabed transformer in accordance with some embodiments, front view, bottom view and side view.

Fig. 8 is the schematic diagram for showing the various aspects of known seabed transformer.

Specific embodiment

Details shown in this article is as an example, and merely for the illustrative discussion to this theme disclosed embodiment Purpose, and presented in the reason of providing is considered as the description of most useful and understandable principle.Disclosed in this theme In terms of concept.In this respect, do not attempt to illustrate in greater detail this theme necessary to comparing basic comprehension disclosed in this theme Disclosed CONSTRUCTED SPECIFICATION, by attached drawing carry out description so that it will be appreciated that how the disclosure of several forms can To embody in practice.In addition, identical appended drawing reference and title indicate identical element in each attached drawing.

Known tank inner canister design, such as shown in Fig. 1, for active parts (winding and the iron in seawater and transformer Core) between double barrier is provided.However, with the additional fuel tank around oil tank of transformer, it is this to set compared with single oil box design It is cooling that meter benefits from ambient seawater really.According to some embodiments, the arrangement of two tanks is described, wherein accommodating winding and core Transformer it is neighbouring and with instrument box common wall.Two tanks are equipped with corresponding dielectric oil.For main power source connection and accessory power supply The electric terminal of connection is located on second/instrument box, and conductor passes through instrument box, is then connected to transformer tank by common wall.

Fig. 1 is the figure for showing the subsea environment in accordance with some embodiments for wherein disposing fault-tolerant seabed transformer.

In seabed, 100a shows station 120, is located at the downstream of several well heads, for example, for generating from subterranean strata Hydrocarbon-containifluids fluids.Stand 120 include seabed pump module 130, have by motor drive pump (or compressor).It stands and 120 is connected to One or more umbilical cables, such as umbilical cord 132. is in this case, umbilical duct passes through seawater 102 from platform 112, along sea In other cases, umbilical cord can be run from some other ground installation, such as Floating Production at bottom 100 destination 120., storage and Discharge mechanism (FPSO) or land based installation.In many cases, in order to reduce energy loss, it is expected that with than in pump module 130 The higher voltage of voltage used in motor transmits energy by umbilical cord.Therefore, standing 120 further includes transformer 140, according to one A little embodiments, transformer 140 are step-down transformers, are configured as the high voltage three-phase power that will be transmitted by umbilical cord 132 The three-phase power of lower voltage is converted to for pump module use.Other than pump module 130 and transformer 140, stands and 120 may be used also Undersea device including various other types, including other pumps and/or compressor.Umbilical cord 132 can also be used to provide barrier and its His fluid, and control and data line for the undersea device in 120 of standing.Note that although transformer 140 is referred to herein as Triphase step-down transformer, but technology is described herein to be equally applicable to other kinds of seabed transformer, such as with other The phase of quantity.

Fig. 2 is the perspective view of fault-tolerant seabed transformer in accordance with some embodiments.Fault-tolerant seabed transformer 140 includes two Metal can: nowel 210 accommodates transformer winding and core, and top box 220 accommodates instrument, external terminal 230 and active transformer portion Electrical interconnection between part.It is visible in Fig. 1.Shown in Figure 2 is that nowel steel wall 212 and external 214. top box 220 of steel frame are gone back With wall 222 and 224. top box of top cover tool there are two metal compensator 232 and 234, each metal compensator includes flexible wave Line pipe and protection structure, and the pressure between the dielectric oil and external environment seawater being configured in balance top box 220.

Fig. 3 A and 3B are the cross-sectional views for showing the various assemblies and aspect of fault-tolerant seabed transformer in accordance with some embodiments. With reference to Fig. 1.As shown in Figure 3A, it is transformer that it is internal, which to include lower 212. nowel of tank wall (or transformer tank), for seabed transformer 140 Active part 332 comprising primary and secondary winding and transformer core for three-phase.Movable part 332 passes through lower tank wall 212 and lower case lid 336 be sealed in nowel.Upper tank wall 222 surrounds top box (or instrument box) 220 comprising nowel compensator 334 With 335.For compensating the lower volume of the pressure change due to caused by temperature fluctuation.Further include but is not shown in upper tank 220 In be instrument and bushing (as shown in Figure 2) for external terminal 230.Lower part tank compensator 334 and 335 includes flexible corrugation Pipe structure fills oil from lower part tank, so that they balance the pressure between lower part tank 210 and upper can 220.Lower part cover 336, top tank skin 222 and restriction 220. upper can of upper can of top cover 356 top are upper can compensators 232 and 234, It is configured to compensate for pressure

Variation in upper tank.Therefore, nowel compensator 334 and 335 is arranged with top box compensator 232 and 234 " series connection ".

Due to the arrangement of tank as shown in the figure, transformer is fault-tolerant, because if the failure of one of tank obstacle, then become Depressor holding can operate completely.According to some embodiments, a kind of seabed transformer tank sealing system is provided, activity will be used for The single lower tank wall of component is combined with the double containment theory between seawater and all movable parts and open connection.Under single wall steel Cooling performance can be improved in tank, and double containment theory can provide redundancy.Single seal failure in system Anywhere will not result in Electrical malfunction.

Referring again to Fig. 1.Visible Fig. 3 A is the active part 332 of transformer 140 in lower channel 210 comprising is twined Three groups of conductors of primary and secondary winding 370,372 and 374. 382 being wound on transformer core 376 be electrically connected to primary and secondary around Group 370,372 and 374 passes through the bushing in lower case lid 336, to be electrically connected with external terminal (in Fig. 3 A invisible), is used for Primary and secondary connection.For example, showing secondary phase conductor 386 is connected to the secondary windings of winding 370 and via bushing 384 Across lower part case lid 336. note that although illustrating only three conductors and bushing in Fig. 3.As shown in Figure 3A, in Fig. 3 also Three conductors and bushing are sightless.3A.Neutral conductor 360 is directly connected to the neutral node of secondary windings for three-phase (that is, with " Y shape " deployment arrangements).

Neutral conductor 360 is connected to integrated HRG device 320, in this case, is shown in 370,372 He of winding 374 lower section .HRP devices 320 are electrically connected to ground by conductor 362, be can be and are for example descended case lid 336 or lower tank wall 212. According to some embodiments, transformer box wall ground connection simultaneously by being connected to umbilical termination head (not shown) ground connection, and until container or Surface facility, such as platform 112 shown in Fig. 1.According to some embodiments, the conductor from HRG device 320 is worn via casing It crosses down case lid 336 and enters top box 220, wherein ground fault measuring system is configured as the electric current of sensing instruction ground fault. About the further details of integrated HRG equipment, referring to Co-pending U.S. Patent Application sequence No..

Upper tank 220 is filled with environment liquid (such as dielectric oil), and accommodates connection system and instrument.Although upper can 220 Filled with environment liquid, but tank 220 is designed and qualified tolerance seawater.According to some embodiments, upper can 220 includes Lower volume 380 is used as " marsh " that can collect a certain amount of seawater.If leaked between upper water box 220 and ocean, A small amount of environment liquid would leak into ocean, but system can operate.If leaked between upper compartment and lower compartment, system It will operation.It note that system can still remain operational even if breaking down combination in some cases in two obstacles.

It is visible in Fig. 1.Fig. 3 B is the diagram of inner/outer fluid flow pattern in accordance with some embodiments.Work as transformation When the live part of device generates heat, the transformer oil in lower tank 210 rises and deviates lower part case lid 336, such as dotted arrow It is shown.The oil of heating is advanced close to the outer wall 212 of tank 210, it is cooled down by ambient seawater there.The seawater of heating such as dotted line arrow Circulation shown in head.In this way, the movable part of heat direction from lower part tank shown in the arrow 390 is defeated to ambient seawater It send.Compared with " tank in tank " type design such as shown in FIG. 1, the heat generated in the single wall part 392 of lower tank 210 is more effectively Transmission.

Fig. 4,5,6 and 7 be the top view of fault-tolerant seabed transformer in accordance with some embodiments, front view, bottom view and side View.In Fig. 1.4, upper fuel tank compensator 232 and 234 is visible.In Fig. 1.It is shown in FIG. 5 including terminal 510 secondary terminal, is mounted on the outside of upper can 220.Secondary phase conductor shown in dotted line includes secondary phase conductor 386, conductive path is formed between the secondary windings and secondary terminal 510 of winding 370.Bus 384, in bottom view.Fig. 6 It is side view.As shown in fig. 7, main phase terminal 610 and secondary terminal 620 are all visible.In Fig. 1.In Fig. 7, secondary is mutually led Body 386 is shown in dotted line, across casing 384 to connect with one in secondary terminal 610.Similarly, primary phase conductor 786 with Dotted line is shown, and is connect by the bus 784 of lower part with a primary terminals 610.

Fig. 8 is the schematic diagram for showing the various aspects of known seabed transformer.In Fig. 1.As shown in figure 8, this is " in tank The example of tank " arrangement, transformer 800 include the core that is contained in inner canister 820 and winding 810. in some cases, core and winding 810 and inner canister 820 be similar.Or identical design, as commonly used in the application of surface.Subsea use is used in order to provide Double barrier, inner canister 820 is fully accommodated in outer tank 830, as shown in the figure.Including pressure compensator 840 to balance outer tank appearance Pressure between long-pending and ambient seawater.In some cases, inner wall 820 is sufficiently flexible, not need individual pressure compensation System.

Although describing this theme through the foregoing embodiment to disclose, it will be appreciated by the skilled addressee that not In the case where being detached from inventive concept disclosed herein, illustrated embodiment can be modified and be changed.

In addition, although describing some embodiments in conjunction with the embodiments in various illustrative structures, those skilled in the art It will be recognized that various specific structures can be used to embody the system.Therefore, in addition to scope of the appended claims and spirit Outside, this theme, which discloses, is not construed as being restricted.

Claims

1. a kind of fault-tolerant underwater transformer includes: one group of main coil windings;Second group of coil windings;It is limited by the first tank skin The first hermetically sealed can, and accommodate second group of coil windings of first tank and tank and the first dielectric fluid, wash it is described just Grade and secondary coil winding group, first tank wall are configured to for being deployed in subsea environment;Second hermetically sealed can accommodates second Dielectric fluid and neighbouring first hermetically sealed can positioning, so that the first and second tanks share the common sparing of the first tank skin;It is mounted on institute It states one on the second tank group of main terminal and is connected to the first tank and lead to the primary coil winding and by the conduction of second slot The common sparing in path, first cell wall enters first slot;The secondary terminal being mounted on second tank with one group, It is connected to the second conductive path of second group of coil windings, and passes through second tank, the common portion of first tank skin Divide and enters first tank.

2. seabed transformer according to claim 1, wherein the common sparing of first tank skin is less than described the About the 50% of the total surface area of one tank, and wherein the non-common of first tank skin is partially configured as directly.

3. seabed transformer according to claim 2, wherein the common sparing of first tank skin is less than described the About the 30% of the total surface area of one tank.

4. seabed transformer according to claim 1, wherein the seabed matched transformer be set to when seawater leak into it is described It is remained operational when in the second tank, but there is no leakages between first and second tank.

5. seabed transformer according to claim 1, wherein the seabed matched transformer is set to when described first and second There is leakage between tank but is remained operational when being leaked into second tank without seawater.

6. seabed transformer according to claim 1 further includes first pressure compensator, the first pressure compensator with First tank is in fluid communication, and is configured to balance the ambient seawater in the internal pressure of first tank and second tank Pressure and/or pressure.

7. seabed transformer according to claim 6 further includes second pressure compensator, the second pressure compensator with Second tank is in fluid communication, and is configured to balance the internal pressure of second tank and ambient seawater pressure.

8. seabed transformer according to claim 7, wherein the first pressure compensator is at least partially accommodated into institute It states in the second tank.

9. seabed transformer according to claim 1 further includes one or more instruments in second tank.

10. seabed transformer according to claim 1 further includes that temperature sensor is located and configured to the first dielectric of measurement The temperature of fluid.