CN211085419U

CN211085419U - Moisture monitor for power transformer

Info

Publication number: CN211085419U
Application number: CN201921982988.0U
Authority: CN
Inventors: 舒均盛; 杨聃
Original assignee: State Grid Zhejiang Electric Power Co Ltd; Jinshuitan Hydropower Plant of State Grid Zhejiang Electric Power Co Ltd
Current assignee: State Grid Zhejiang Electric Power Co Ltd; Jinshuitan Hydropower Plant of State Grid Zhejiang Electric Power Co Ltd
Priority date: 2019-11-15
Filing date: 2019-11-15
Publication date: 2020-07-24
Anticipated expiration: 2029-11-15

Abstract

The utility model relates to a monitoring facilities field especially relates to a moisture monitor for power transformer. The device consists of a floating block, a guide rod, an induction part, a dry contact, a wiring terminal, an air release plug, a rain-proof cap, a test probe, a shell, an observation window, a shading cover, an upper connector, a lower connector, an optional adjusting container and a valve. The utility model discloses install in the below of capsule (or diaphragm) formula oil conservator, utilize the density difference of water and transformer oil, according to the buoyancy principle, the kicking block come-up when having the moisture of capacity in its inside, the response piece on the kicking block makes the dry contact actuation of top send has moisture alarm signal, realizes monitoring effectively the moisture in the transformer, improves the fail safe nature of transformer operation. The utility model discloses can be used to two kinds of immiscible liquid A and B, the density of A is greater than B, can have the bottom installation of container the utility model discloses, send the warning when thoughtlessly having a small amount of A in B, remind the user to handle.

Description

Moisture monitor for power transformer

Technical Field

The utility model relates to a monitoring facilities field especially relates to a moisture monitor for power transformer.

Background

The fully-sealed oil conservator is an important part of a power transformer, and is mainly used for compensating volume change of transformer oil caused by temperature change, and isolating the transformer oil from air in order to ensure the quality of the transformer oil, so that the insulation performance of the transformer oil is prevented from being reduced due to the fact that moisture in the air enters. The types of fully-sealed oil conservators are various, and mainly comprise capsule type, diaphragm type and metal corrugated expansion type.

When the capsule type or diaphragm type oil conservator is in normal operation, the capsule (or diaphragm) floats above the transformer oil to prevent the transformer oil from contacting with air. However, the air outside the capsule (or the diaphragm) contains a small amount of moisture, the capsule (or the diaphragm) cannot achieve 100% of seepage-proofing capacity, and a small amount of moisture still slowly enters the transformer oil in the capsule (or the diaphragm) through the seepage action after a long time, so that the transformer oil enters the oil conservator. In order to prevent the moisture from entering the transformer body from the oil conservator to cause more serious accidents, a dirt collecting box is arranged below the capsule type (or diaphragm) oil conservator, the moisture is collected in the dirt collecting box, and the valve below the dirt collecting box is opened to discharge the moisture during maintenance. However, whether water is accumulated in the sewage collecting box or not and whether water needs to be discharged or not cannot be known in advance. If the water in the sewage collecting box is too much and overflows when the capsule is damaged or the like under severe conditions, the water can be distributed into the transformer body, so that serious transformer accidents are caused, and at present, no equipment capable of monitoring whether the water in the sewage collecting box needs to be drained or not exists.

SUMMERY OF THE UTILITY MODEL

The utility model provides a moisture monitor for power transformer can not monitor liquid moisture under the condition of air contact effectively promptly under the totally enclosed state, when liquid moisture accumulation exceeds standard, in time sends alarm signal, improves the fail safe nature of transformer operation.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a moisture monitor for power transformer, includes the casing, is filled with transformer oil in the casing, be equipped with the kicking block in the casing, the kicking block soaks in transformer oil, and the density of kicking block is greater than transformer oil's density and is less than the density of water, is equipped with the dry contact on the casing, is equipped with the response piece that is used for triggering the dry contact on the kicking block, and when the kicking block come-up, the response piece triggers the dry contact in order to send alarm signal.

This a moisture monitor for power transformer fixes the position (such as the bottom of the oil conservator or collection dirty box etc.) lower part and rather than being linked together of the easy gathering of liquid moisture of transformer at normal operating, and transformer oil in the transformer can flow in the casing, makes and is full of transformer oil in the casing, and the floating block is soaked in transformer oil, is equipped with the dry contact in the casing, and the dry contact is located the top of floating block, and the top of floating block is inlayed and is used for triggering the response piece of dry contact. The density of the floating block (including the induction part) is greater than that of the transformer oil but less than that of water, when no water exists in the shell, the buoyancy force borne by the floating block is small, the floating block sinks, and the dry contact above the floating block is disconnected. When having water to get up when more in the casing, the buoyancy that the kicking block received increases gradually, floats until the kicking block to constantly rise, be more and more near from the dry contact of top, the response piece on the last kicking block triggers the dry contact, and this a moisture monitor for power transformer sends has moisture alarm signal, reminds the staff to handle, thereby realizes keeping watch on and reporting to the police moisture, improves the fail safe nature of transformer operation. The utility model discloses equally can be used to two kinds of immiscible liquid A and B, the density of A is greater than B, can install in the bottom of container the utility model discloses, send the warning when thoughtlessly having a small amount of A in B, remind the user to handle.

Preferably, a guide rod is vertically arranged in the shell, the guide rod penetrates through the floating block, and the floating block can move up and down along the guide rod. The guide rod limits the moving direction of the floating block, and ensures that the induction part can trigger the dry contact to send out a moisture alarm signal when the floating block floats upwards.

Preferably, the outer surface of the floating block is provided with horizontal scale marks, a series of scale marks are vertically distributed along the floating block, the shell is provided with a transparent observation window, and the scale marks can be observed through the observation window. Whether the shell is internally provided with accumulated water or not can be judged by observing the position of the scale marks through the observation window, and the accumulated water in the shell can be directly observed when the condition is serious, so that the drainage treatment is carried out.

Preferably, the graduation marks are sequentially marked by different colors in a segmentation way in the distribution direction. In order to facilitate warning of workers, when the scale marks reach dangerous positions, namely, accumulated water in the shell is more, the scale marks at the section are directly marked by similar red marks, different colors are adopted to correspond to different interval ranges of the scale marks, and the accumulated water in the shell can be known without specifically seeing the scale marks.

Preferably, the dry contact is a dry spring contact, and the inductive element is a magnet. The utility model provides a triggering mode, the floater floats, and magnet makes the dry spring contact actuation of top, sends out moisture alarm signal, reminds the staff to handle.

Preferably, the casing is provided with a vent plug for discharging air in the casing to the outside of the casing. The air in the shell can be exhausted by opening the air release plug, so that the transformer oil can fill every corner of the shell.

Preferably, the shell is further provided with a connecting terminal, and the connecting terminal is used for connecting a dry contact. The connecting terminal and the shell are sealed and insulated.

Preferably, a rain-proof cap is arranged on the shell and covers the wiring terminal and the air release plug. The rain-proof cap can prevent the wiring terminal, the air release plug and the like from being exposed to severe environments of sunshine, dryness and rain for a long time, and the reliability and the service life of the water monitor for the power transformer are improved.

Preferably, the bottom of the housing is provided with a valve which is opened for discharging the water in the interior. When the moisture monitor for the power transformer monitors that moisture is accumulated, the valve is opened to discharge all the moisture.

The utility model has the advantages that: the density of water is greater than transformer oil's density, water sinks in the below of transformer oil, the density of floating block (including response piece) slightly is greater than transformer oil's density but is less than the density of water, when this be used for in the moisture monitor of power transformer not have water, the floating block sinks, the dry contact is in the off-state, when this be used for in the moisture monitor of power transformer has sufficient water, the floating block come-up, the response piece triggers the dry contact, it has moisture alarm signal to send, remind the staff to handle, thereby realize surveing and reporting to the police moisture, improve the fail safe nature of transformer operation.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the following drawings without inventive work.

Fig. 1 is a schematic structural diagram of the present invention.

Reference numerals: the device comprises a floating block 1, a guide rod 2, an induction part 3, a dry contact 4, a wiring terminal 5, an air release plug 6, a rain-proof cap 7, a test probe 8, a shell 9, an observation window 10, a shading cover 11, an upper connector 12, a lower connector 13, an optional adjusting container 14 and a valve 15.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

A moisture monitor for a power transformer according to an embodiment of the invention is described below with reference to the accompanying drawings, as shown in figure 1,

the utility model provides a moisture monitor for power transformer, includes floating block 1, guide arm 2, response piece 3, dry contact 4, binding post 5, gassing stopper 6, rain-proof cap 7, test probe 8, casing 9, viewing aperture 10, shading lid 11, go up interface 12, lower interface 13, optional regulation container 14, valve 15, the casing plays support and the guard action to whole device part, and have sealed cooperation between each part. Be equipped with the kicking block in the casing, there are two round holes at the kicking block middle part, be equipped with a series of horizontal scale marks on the surface of kicking block, the scale mark is along kicking block vertical distribution, the kicking block is in proper order with different colours segmentation sign in the vertical direction of distribution, for the convenience of warning staff, when the scale mark has arrived dangerous position (inside ponding is more promptly), this section scale mark is direct with similar red sign, adopt the different interval scope of the colour correspondence scale mark of difference, the top of kicking block is inlayed and is had the response piece that is used for triggering the dry contact, the density of kicking block (containing the response piece) is greater than the density of transformer oil but is less than the density of. The shell is internally provided with a dry contact which is positioned above the floating block and is connected with a wiring terminal on the shell. During normal operation, the water monitor for the power transformer is filled with transformer oil, and according to the buoyancy principle, because the density of the floating block is greater than that of the transformer oil, the floating block sinks, and the dry contact above the floating block is disconnected. When more and more water exists in the water monitor for the power transformer, the water is sunk below the transformer oil because the density of the water is greater than that of the transformer oil. The buoyancy to which the floating block is subjected is gradually increased. The floating block floats and continuously rises, the dry contact is closer and closer to the dry contact above, and finally the induction piece on the floating block triggers the dry contact to send out a moisture alarm signal to remind a worker to process, so that moisture monitoring and alarming are realized, and the safety and reliability of the operation of the transformer are improved.

The dry contact is a dry spring contact, the induction part is a magnet, a dry contact triggering mode is provided, the floating block floats upwards, the magnet enables the dry spring contact above to be attracted, and a moisture alarm signal is sent out to remind a worker to process the dry spring contact. One end of the wiring terminal is connected with the dry contact, and the other end of the wiring terminal is connected with an external alarm circuit to play a role in leading out an alarm signal. The connecting terminal and the shell are sealed and insulated.

The guide rod is arranged in the shell and penetrates through the two round holes in the middle of the floating block, the floating block can slide on the guide rod, the guide rod limits the sliding direction of the moving block, and when the floating block floats upwards, the sensing piece can accurately trigger the dry contact to send out a moisture alarm signal.

Be equipped with the bleeder on the casing, open the bleeder and can be with this air escape in the moisture monitor for power transformer, make transformer oil can be full of this each corner of moisture monitor for power transformer. The shell is provided with a rain-proof cap which covers the wiring terminal and the air release plug. The rain-proof cap can prevent the wiring terminal, the air release plug and the like from being exposed to severe environments of sunshine, dryness and rain for a long time, and the reliability and the service life of the water monitor for the power transformer are improved.

The shell is provided with a transparent observation window, and the upper surface of the observation window is provided with a marking line. Can observe scale mark and different colours segmentation sign on the floating block through the observation window, can judge whether inside has ponding according to scale mark and different colours segmentation sign, can direct observation to inside ponding when the condition is serious to carry out drainage treatment. The observation window is provided with the shading cover, the shading cover is in the covering position under the general condition and is opened only when in observation, so that the transformer oil can be prevented from being emulsified due to the irradiation of external light.

The bottom of casing is equipped with experimental probe, and experimental probe contacts with the bottom of kicking block, has sealed cooperation between probe and the casing, and experimental probe is used for testing whether whole device can carry out normal work, can press experimental probe with the hand, promotes kicking block upward movement, triggers the dry contact to verify this moisture monitor performance that is used for power transformer whether intact. A protruding part is arranged above the inside of the shell, and when the floating block is pushed to move upwards by pressing the test probe with a hand, the protruding part can prop against the floating block, so that the dry contact is not stressed, and the effect of protecting the dry contact is achieved.

The bottom of the shell is provided with a valve, the valve is opened to discharge the water in the interior, and when the alarm device monitors that the water is accumulated, the valve is opened to discharge all the water. The upper end of the shell is provided with an upper interface which is used for being connected with a dirt collecting box (or the bottom) of the transformer oil conservator, the lower end of the shell is provided with a lower interface which is used for being connected with an optional adjusting container, and the optional adjusting container is an optional component which can make the device alarm when more moisture is accumulated. The valve is connected to the optional regulating reservoir and is directly connected to the lower port when the optional regulating reservoir is not in use.

When this embodiment is implemented, the floating block (including magnet) density slightly is greater than the density of oil but is less than the density of water, and when it soaked in oil, the floating block sinks in below, and when moisture was constantly increased, the floating block constantly rose, and the floating block rose to make magnet be close to the dry spring contact and make its internal contact action when certain degree, and this a moisture monitor for power transformer sends moisture and reports to the police, reminds relevant personnel to handle.

The above is only the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all of which are in the utility model discloses a conceive, utilize the equivalent structure transform that the content of the specification and the attached drawings did, or directly/indirectly use all to include in other relevant technical fields the patent protection scope of the present invention.

Claims

1. The utility model provides a moisture monitor for power transformer, includes the casing, characterized by, be equipped with the kicking block in the casing, the kicking block soaks in transformer oil, and the density of kicking block is greater than transformer oil's density and is less than the density of water, is equipped with the dry contact on the casing, is equipped with the response piece that is used for triggering the dry contact on the kicking block, and when the kicking block come-up, the response piece triggers the dry contact in order to send alarm signal.

2. The moisture monitor for a power transformer as recited in claim 1, wherein said housing has a vertically disposed guide rod extending through said float, said float being movable up and down along said guide rod.

3. The moisture monitor for the power transformer as claimed in claim 2, wherein the float block has graduations on an outer surface thereof, the graduations being vertically distributed along the float block, the housing having a transparent viewing window, the positions of the graduations being viewable through the viewing window.

4. The moisture monitor for a power transformer as recited in claim 3, wherein said graduations are sequentially marked in different color segments in a distribution direction.

5. The moisture monitor for a power transformer as recited in claim 1, wherein said housing further comprises terminals for connecting to dry contacts.

6. The moisture monitor for a power transformer as recited in claim 1, wherein said dry contact is a dry spring contact and said sensing element is a magnet.

7. The moisture monitor for a power transformer as recited in claim 1, wherein said housing has a vent plug for venting air in said housing to the exterior of said housing.

8. The moisture monitor for the power transformer as claimed in any one of claims 1 to 7, wherein the casing is provided with a rain-proof cap, and the rain-proof cap is covered on the casing.

9. A moisture monitor for a power transformer according to any one of claims 1 to 7 in which the base of the housing is provided with a valve which opens to drain water from the housing.