CN204315459U - Buchholz relay and the power transformer comprising described relay - Google Patents
Buchholz relay and the power transformer comprising described relay Download PDFInfo
- Publication number
- CN204315459U CN204315459U CN201520012543.5U CN201520012543U CN204315459U CN 204315459 U CN204315459 U CN 204315459U CN 201520012543 U CN201520012543 U CN 201520012543U CN 204315459 U CN204315459 U CN 204315459U
- Authority
- CN
- China
- Prior art keywords
- relay
- inner cavity
- cavity chamber
- buchholz relay
- power transformer
- 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.)
- Expired - Fee Related
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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
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
- H01H33/55—Oil reservoirs or tanks; Lowering means therefor
- H01H33/555—Protective arrangements responsive to abnormal fluid pressure, liquid level or liquid displacement, e.g. Buchholz relays
-
- 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
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Housings And Mounting Of Transformers (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
An aspect of the present utility model relates to Buchholz relay and comprises the power transformer of described relay.Specifically disclose a kind of Buchholz relay, comprising: housing, there is the inner cavity chamber being designated as and filling described iknsulating liquid at least in part; Supporting structure; Actuating device, described actuating device can move relative to described supporting structure when the horizontal plane being present in the described iknsulating liquid in described inner cavity chamber changes; Switching device, when the horizontal plane of the iknsulating liquid in described inner cavity chamber reaches warning level or the dropout level of described power transformer respectively, makes warning circuit and/or trip circuit enable; Be characterised in that, it comprises magnetic screen portion, and this magnetic screen portion is positioned at described enclosure interior and is arranged to protect described switching device at least in part not by the magnetic disturbance of described relay outside.As Buchholz relay of the present disclosure can improve the phenomenon of the not timely operation caused because of the disturbing factor of relay outside.
Description
Technical field
The utility model relates to the Buchholz relay (Buchholzrelay) for the protection of power transformer, and relates to the power transformer comprising this relay.
Background technology
As is known, power transformer is used to electric power transfer and distribution.
In their most general design, power transformer comprises the magnetic core that electric winding is located around it; This magnetic core and winding immerse and are included in the inner insulation of confining liquid case (tank) and cooling fluid.
This dielectric fluid (usually by can be that mineral or vegetal insulating oil are formed) performs fully isolates electromagnetic component and the dual-use function cooling them each other.
This dual-use function bears vital task in the normal operation of transformer, and for this reason, even if at high temperature and for the long running period, the oil used also must keep stable.
And power transformer comprises replenisher case (being generally called liquid storage pool), it to be positioned at above liquid case and to be full of identical oil.
This liquid storage pool is communicated with liquid case internal hydraulic pressure, and with the inevitable change making the oil wherein comprised can compensate the volume of the oil be included in liquid case, this change mainly causes because of temperature fluctuation.
Regrettably, during use, the abnormal gas existed may be there is in oil; Such as, gas can use the decomposition of liquid or solid insulator or deteriorated and produce by institute, and because of overheated or cause because there is electric arc, or can cause oil being fed to the insufficient degassed of this oil of cause in the liquid case of transformer, or cause because of other reason.
As a rule, even to there is gas in oil be the sign of irregular working is the sign of breakneck incipient failure.
In addition, fast current can produce in oil because of abnormal even dangerous operating condition (as short circuit, internal arc etc.).
In order to monitor the appearance of these phenomenons, power transformer is equipped with particular security device, and known in the art is Buchholz relay.
In general, the highest portion that Buchholz relay is arranged in liquid case along hydraulic path is divided, and it is inner that it is placed on the liquid case be communicated with liquid storage pool inside, and comprise the housing of demarcating with the inner cavity chamber comprising same dielectric oil.
This chamber interior comprises supporting mass, and this supporting mass is for comprising the upper buoy and target mobile device of floating downward that are associated with corresponding reed switch or contact respectively.
Specifically, when occurring gas in oil, this gas is tending towards upwards flowing and is accumulated in the chamber interior of Buchholz relay, thus causes the oil wherein comprised to reduce.
First this minimizing is detected by upper buoy, and upper buoy moves until arrive a threshold position, and in this position, it causes the magnetic actuation of switch associated with it, and therefore generates alarm signal as a result.
If there is oil in transformer to reveal, then descend buoy action, lower buoy moves until arrive dependent thresholds, and at this threshold value place, it causes the magnetic actuation of second switch or contact associated with it, and it causes transformer out of service usually again.
Although prior art Buchholz relay fully performs the function for they designs, current still exist some aspect that can improve further, and specifically, in the agility and accuracy of operation, whether these are only warning, or the most serious out of service.
In fact, the reed switch be associated with buoy or the magnetic actuation of contact may because of external interference factors but not the inner gas that effectively exists of such as Buchholz relay and causing, even thus cause transformer warning out of service completely not in time or unnecessary.
Utility model content
Therefore, the purpose of this utility model is to provide so a kind of Buchholz relay, that is, it allows to solve the problem at least in part, and specifically, prevents the not timely operation caused because of the disturbing factor of relay outside.
This object is realized by following: a kind of Buchholz relay of power transformer for the protection of having the liquid storage pool comprising iknsulating liquid, and described relay comprises:
-housing, this housing has the inner cavity chamber being designated as and being filled with described iknsulating liquid at least in part;
-supporting structure, this supporting structure is arranged in described inner cavity chamber;
-actuating device, be coupled to described supporting structure this actuating means being operable, and be suitable for immersing at least in part in described iknsulating liquid, when the horizontal plane being present in the described iknsulating liquid in described inner cavity chamber changes, described actuating device is removable relative to described supporting structure;
-switching device, this switching device is activated with magnetic means by described actuating device, during to reach warning level or the dropout level of described power transformer respectively when the horizontal plane of the iknsulating liquid in described inner cavity chamber, enable warning circuit and/or the trip circuit of described power transformer;
Be characterised in that, it comprises magnetic screen portion, and this magnetic screen portion is positioned at described enclosure interior, and is configured to protect described switching device at least in part not by the magnetic disturbance of described relay outside.
Preferably, described magnetic screen portion comprises a main body, and described main body is made up of feeromagnetic metal plate or is at least had a ferromagnetic surface, and described main body is configured to insert in described inner cavity chamber, and is inserted between described housing and described switching device.
Preferably, described magnetic screen portion has the tubular body in the described inner cavity chamber inserting described housing.
Preferably, described tubular body inserts in described inner cavity chamber, and roughly extends along the whole vertical stretch of described inner cavity chamber.
Preferably, described tubular body comprises solid sidewall, and the opposite sides to each other of described solid sidewall obtain at least two through holes, and described through hole is suitable for allowing described iknsulating liquid to flow through described relay.
The utility model also relates to a kind of power transformer, is characterised in that, it comprises at least one foregoing Buchholz relay.
Accompanying drawing explanation
Further feature and advantage with reference to the accompanying drawings in illustrative by non-limitmg examples, will be clearer according to the preferred and non-exclusive embodiment of Buchholz relay of the present utility model and the associate power transformer that comprises this relay, wherein:
-Fig. 1 shows the partial cutaway perspective view of the possible embodiment according to Buchholz relay of the present utility model;
-Fig. 2 and 3 exemplified with can be possible two according to the magnetic screen portion used in Buchholz relay of the present utility model embodiment;
-Fig. 4-6 shows the magnetic screen portion insertion shown in Fig. 2 according to the sequence of the step in the main body of Buchholz relay of the present utility model;
-Fig. 7 is exemplified with the cross sectional portion of the main body according to Buchholz relay of the present utility model;
-Fig. 8 is exemplified with an example of the power transformer comprised according to Buchholz relay of the present utility model.
Embodiment
It is emphasized that from structure or function view, identical or equivalent elements will utilize identical label to indicate in the following description, and no matter they are the facts be illustrated in different embodiments.
Also it must be emphasized that, for the clear and succinct object of this description, accompanying drawing can not scale, and some feature introduced in this descriptions can be shown in the drawings by schematic a little mode.
Fig. 1 shows according to Buchholz relay of the present utility model, and its whole label 1 indicates, and shows part section, to give prominence to some intrawares by way of example.
As implied above, this Buchholz relay 1 (being simply designated as below " relay 1 ") is normally used for protecting power transformer 100, and an example of embodiment has carried out schematically illustrating in fig. 8.
Specifically, extensively known and therefore in the embodiment that this does not describe in detail according to this area, power transformer 100 (as shown in Figure 8) comprises liquid case 101, it comprises iknsulating liquid 102, be generally mineral oil, ester oil or vegetable oil, the active Electromagnetic parts of transformer are immersed wherein, that is, magnetic core and each electric winding.
Above liquid case 101, be set using the liquid storage pool 103 being filled with identical type iknsulating liquid 102, liquid storage pool 103 is communicated with liquid case 101 internal hydraulic pressure via feed tube 104, prolongs feed tube 104 and has installed Buchholz relay.
Specifically, inner hollow housing 2 is comprised below according to Buchholz relay 1 (being simply designated as " relay 1 ") of the present utility model, it is configured to have two flanges 3 being designated as and being mechanically attached to feed tube 104, and iknsulating liquid 102 flows between liquid storage pool 103 and liquid case 101 inside along feed tube.
And housing 2 comprises roughly along the inner cavity chamber 4 extended relative to the horizontal direction in the direction of joint two end flange 3; This chamber 4 is designated as and is filled with same dielectric liquid 102 at least in part, and is in fact formed in the place of any gas buildup that transformer 100 inside is formed.
In this inner cavity chamber 4, be provided with supporting structure or framework, its example is illustrated by Fig. 1 completely, and its whole label 5 indicates; This structure 5 (such as, being made up of plastic material) has the extensively known shape in this area, and does not describe in detail at this thus,
This relay 1 also comprises actuating device 10, and it is operationally coupled to supporting structure 5, and is suitable for immersing at least in part in iknsulating liquid 102; Specifically, actuating device 10 is connected to supporting structure 5, and can move relative to it when the horizontal plane of the iknsulating liquid 102 be present in inner cavity chamber 4 changes.
In the embodiment shown, actuating device 10 such as comprises buoy (or alarm float) 10A, and lower buoy (or dropout buoy) 10B.
This relay 1 also comprises switching device 20, it is activated with magnetic means by described actuating device 10, during to reach warning level or the dropout level of transformer 100 respectively when the horizontal plane of the iknsulating liquid 102 in inner cavity chamber 4, enable warning circuit and/or the trip circuit of power transformer 100.
According in relay 1 of the present utility model, and according to extensively known embodiment, this switching device 20 comprises at least one warning reed contact 20A and one or more dropout reed contact 20B.
In practice, during operation, if liquid case 101 generates gas inside of transformer 100, then this gas buildup is in the top of the inner cavity chamber 4 of relay 1, thus causes the horizontal plane of the iknsulating liquid 102 be present in this chamber to decline.
This horizontal plane declines and is first arrived by upper buoy 10A " sensing ", it moves until arrive a threshold position, in this position, it enables warning reed contact 20A with magnetic means, thus makes it switch to the mode of operation wherein enabled and be suitable for the associated circuits generating alarm signal from idle condition.
Reveal if there is oil, then the horizontal plane of the iknsulating liquid 102 in inner cavity chamber 4 continues to decline, until lower buoy 10B also moves to reach respective threshold, at this threshold value place, dropout contact 20B activates with magnetic means; These dropout contacts switch to the operating position wherein enabling the trip circuit making transformer 100 out of service from clear position.
Advantageously, comprise magnetic screen portion 30 according to relay 1 of the present utility model, it is positioned at housing 2, and is configured to protection switch device 20 at least in part by the magnetic disturbance of relay 1 outside.
Specifically, this magnetic screen portion 30 comprises a main body, and it is made up of feeromagnetic metal plate, or has ferromagnetic surface, and to be configured to insert in inner cavity chamber 4 and to be inserted between housing 2 and switching device 20.
In more detail, magnetic screen portion 30 has the tubular body in the inner cavity chamber 4 inserting housing 2; Preferably, such as, as shown in Fig. 1,5 and 6, the described tubular body in magnetic screen portion 30 to be inserted in the whole vertical stretch of inner cavity chamber 4 and roughly to extend along it, until it arrives this cavity bottom, also through the horizontal through part allowing oil flowing two end flange 3.
According to the first embodiment shown in such as Fig. 2 and 4-7, the tubular body in this magnetic screen portion 30 comprises solid sidewall, the opposite sides to each other of this solid sidewall obtain at least two through holes 31,32, this through hole is suitable for, once relay 1 installation is coupled to transformer 100, just allowing iknsulating liquid 102 to flow through this relay 1; In the case of necessary, can tubular body, be wherein necessary to allow to arrange other opening in the region of the horizontal plane directly seeing the iknsulating liquid be present in inner cavity chamber 4 from outside.
Another embodiment according to Fig. 3, the sidewall of this tubular body has solid area 33 and porous region 34; Specifically, equally in this case, porous region 34 is at least arranged in the flow region of iknsulating liquid 102 between two end flange 3, and further, porous region 34 can be arranged on tubular body, be wherein necessary allow directly see in the region of the horizontal plane of the iknsulating liquid be present in inner cavity chamber 4 from outside.
In practice; see how allowing realization to wish object according to the Buchholz relay 1 of the utility model 1; as; in fact magnetic screen portion 30 surrounds various switching device 20; there is provided enough magnetic protections to them, and prevent or significantly reduce the possibility of the accidental activation even caused because of outside magnetic disturbance.
Like this, even the possibility that transformer produces spurious alarm temporarily out of service is sharply reduced.
Must be noted that this result realizes by easily producing the structure solution of even more simply assembling.
In fact, this magnetic screen portion such as can pass through any ferromagnetic material sheet (such as, AISI 430 steel), is shaped, or is obtained by punching press by means of sheet metal; Or this shielding part can pass through another technique (such as, by means of nanometer technology) and obtain, and at least has ferromagnetic surface etc. to make the main body of this shielding part.
Between erecting stage and such as shown in Fig. 4-6, remove the lid 7 accommodating the terminal of interlock circuit and the relay 1 of electric/electronic component just enough; Then this shielding part 30 is vertically inserted in inner cavity chamber 4, until arrive bottom, places respectively in the face of the opening 31 and 32 (or corresponding porous region 34) of respective end flange 3; After other assembly being positioned at housing 2 inside, lid 7 can be replaced to close this assembly.
This simple designs makes the power transformer 100 of any type being applicable to utilize the iknsulating liquid be included in related fluid case according to relay 1 of the present utility model completely, such as Fig. 8 shown type; Therefore, the utility model also relates to power transformer 100, is characterised in that, it comprises according at least one Buchholz relay 1 above-described.
Previously described relay is subject to many modifications and variations, and it all falls in the scope of the utility model design as limited by appended claims; Such as, this magnetic screen portion 30 can have and described variform shape, and can differently locate, and actuating device 10 and/or switching device 20 and/or supporting structure 5 can differently be located or configure, as long as this is compatible mutually with the object of the application.
In practice, material and yardstick can be any material and the yardstick that meet demand and the state of the art.
Claims (7)
1. a Buchholz relay (1), for the protection of the power transformer (100) with the liquid case (101) comprising iknsulating liquid (102), described Buchholz relay (1) comprising:
-housing (2), has the inner cavity chamber (4) being designated as and filling described iknsulating liquid (102) at least in part;
-supporting structure (5), is arranged in described inner cavity chamber (4);
-actuating device (10), operatively be coupled to described supporting structure (5), and be suitable for immersing at least in part in described iknsulating liquid (102), when the horizontal plane being present in the iknsulating liquid (102) in described inner cavity chamber (4) changes, described actuating device can be mobile relative to described supporting structure (5);
-switching device (20), activated with magnetic means by described actuating device (10), with when the horizontal plane of the iknsulating liquid (102) in described inner cavity chamber (4) reaches warning level or the dropout level of described power transformer (100) respectively, the warning circuit of described power transformer and/or trip circuit are enabled;
The feature of described Buchholz relay (1) is; comprise magnetic screen portion (30); it is inner that this magnetic screen portion is positioned at described housing (2), and be arranged to protect described switching device (20) at least in part not by the magnetic disturbance that described relay (1) is outside.
2. Buchholz relay according to claim 1 (1), wherein, described magnetic screen portion (30) comprises a main body, described main body is made up of feeromagnetic metal plate or is at least had a ferromagnetic surface, and described main body is configured to insert in described inner cavity chamber (4), and is inserted between described housing (2) and described switching device (20).
3. according to the Buchholz relay (1) described in aforementioned claim, wherein, described magnetic screen portion (30) has the tubular body in the described inner cavity chamber (4) inserting described housing (2).
4. Buchholz relay according to claim 3 (1), wherein, described tubular body inserts in described inner cavity chamber (4), and roughly extends along the whole vertical stretch of described inner cavity chamber (4).
5. Buchholz relay according to claim 3 (1), wherein, described tubular body comprises solid sidewall, the opposite sides to each other of described solid sidewall obtain at least two through holes (31,32), and described through hole (31,32) is suitable for allowing described iknsulating liquid (103) to flow through described relay (1).
6. Buchholz relay according to claim 5 (1), wherein, the described solid sidewall of described tubular body has solid area (33) and porous region (34).
7. a power transformer (100), is characterized in that, comprises at least one according to the one or more described Buchholz relay (1) in aforementioned claim.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITMI2014U000002 | 2014-01-08 | ||
| ITMI2014U000002U ITMI20140002U1 (en) | 2014-01-08 | 2014-01-08 | BUCHHOLZ TYPE RELAY AND ELECTRIC POWER TRANSFORMER INCLUDING SUCH RELAY |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204315459U true CN204315459U (en) | 2015-05-06 |
Family
ID=53137761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520012543.5U Expired - Fee Related CN204315459U (en) | 2014-01-08 | 2015-01-08 | Buchholz relay and the power transformer comprising described relay |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN204315459U (en) |
| DE (1) | DE202014106299U1 (en) |
| IT (1) | ITMI20140002U1 (en) |
-
2014
- 2014-01-08 IT ITMI2014U000002U patent/ITMI20140002U1/en unknown
- 2014-12-30 DE DE202014106299.8U patent/DE202014106299U1/en not_active Expired - Lifetime
-
2015
- 2015-01-08 CN CN201520012543.5U patent/CN204315459U/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE202014106299U1 (en) | 2015-07-27 |
| ITMI20140002U1 (en) | 2015-07-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180524 Address after: Baden, Switzerland Patentee after: ABB TECHNOLOGY LTD. Address before: Zurich Patentee before: ABB Transmit OY |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150506 Termination date: 20190108 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |