CN116026490A - Plug-in transformer sleeve with temperature measurement function - Google Patents
Plug-in transformer sleeve with temperature measurement function Download PDFInfo
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- CN116026490A CN116026490A CN202211287999.3A CN202211287999A CN116026490A CN 116026490 A CN116026490 A CN 116026490A CN 202211287999 A CN202211287999 A CN 202211287999A CN 116026490 A CN116026490 A CN 116026490A
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Abstract
The invention provides a plug-in transformer bushing with a temperature measuring function, which comprises the following components: the base is used for defining a base inner cavity, a first end of the base is provided with a base flange used for being fixed with the transformer box body, and a second end of the base is provided with a plug used for being connected with a lead-out wire of a transformer winding; an optical fiber temperature measuring interface is arranged at the base flange; the inner cavity core is arranged in the inner cavity of the base; the multi-core temperature measuring optical fiber is led into the inner cavity of the base from the optical fiber temperature measuring interface, and a plurality of temperature measuring optical fiber probes of the multi-core temperature measuring optical fiber are distributed at different positions of the inner cavity core and the plug head and are used for measuring the temperature of the corresponding positions. According to the scheme, the temperature information of each position in the inner cavity closed space of the plug-in sleeve base can be accurately obtained, maintenance personnel are assisted in overhauling, vicious circle of overheat and poor contact of plug-in contact points is avoided, and the safety and reliability of long-term operation of the current carrying structure of the plug-in sleeve are ensured.
Description
Technical Field
The invention relates to power equipment, in particular to a pluggable transformer bushing with a temperature measurement function.
Background
The transformer bushing is a main insulation device outside the transformer box, outgoing lines of the transformer winding penetrate through the transformer bushing, insulation between the outgoing lines and the transformer shell are guaranteed, and meanwhile the effect of fixing the outgoing lines is achieved. One end of the transformer sleeve extends into the transformer box body to be electrically connected with a coil lead of the transformer, and the other end extends out of the box body of the transformer to be electrically connected with a cable or a bus exposed outside the transformer.
The plug-in transformer bushing separates the bushing oil middle part from the transformer box body through the base structure, so that two independent cavities are formed between the inner cavity of the base and the inner cavity of the transformer box body. The base contact of the pluggable sleeve can be pluggable to realize electrical connection, so that the transformer sleeve can be pluggable, and the overhaul is greatly simplified.
Although the pluggable structure is convenient to overhaul, under some special operation conditions, for example, the pluggable structure is influenced by external environment factors such as earthquake, typhoon and the like, the electrical connection of the pluggable contact is unreliable, the contact surface is overheated due to long-time operation condition contact, the vicious circle is caused, and even faults occur in serious cases. Because the inner cavity structure of the sleeve base is closed, the existing on-line monitoring and infrared temperature measurement cannot be applied, and the overheat abnormal state is difficult to monitor. No effective solution has been proposed in the prior art.
Disclosure of Invention
An object of the present invention is to provide a plug-in type transformer bushing capable of monitoring the temperature state inside the bushing.
A further object of the invention is to detect the overheat condition in time by temperature monitoring, thereby improving the safety and reliability of the sleeve.
In particular, the invention provides a plug-in transformer bushing with a temperature measuring function, which comprises:
the base is used for defining a base inner cavity, a first end of the base is provided with a base flange used for being fixed with the transformer box body, and a second end of the base is provided with a plug used for being connected with a lead-out wire of a transformer winding; an optical fiber temperature measuring interface is arranged at the base flange;
the inner cavity core is arranged in the inner cavity of the base;
the multi-core temperature measuring optical fiber is led into the inner cavity of the base from the optical fiber temperature measuring interface, and a plurality of temperature measuring optical fiber probes of the multi-core temperature measuring optical fiber are distributed at different positions of the inner cavity core and the plug head and are used for measuring the temperature of the corresponding positions.
Optionally, the temperature measuring optical fiber probes arranged on the inner cavity core are sequentially arranged along the extending direction from the base flange to the plug head; and the temperature measuring optical fiber probe arranged on the plug head is arranged in an area with a set safety distance from the plug contact point.
Optionally, the temperature measuring optical fiber probe arranged on the inner cavity core is fixed on the surface of the inner cavity core in an adhesive mode, and is bound and fixed by using a binding belt; the temperature measuring optical fiber probe arranged on the plug head is fixed to the plug head in an adhesive mode.
Optionally, the inner cavity core comprises: a straight barrel section near the base flange, and a tapered section extending from the end of the straight barrel section to the plug head and having a radial dimension tapered; the temperature measuring optical fiber probes arranged on the straight barrel section are arranged at equal intervals along the axial direction of the inner cavity core; the temperature measuring optical fiber probes arranged on the tapered section are arranged at reduced intervals along with the reduction of the axial distance from the temperature measuring optical fiber probes to the plug head.
Optionally, the plug head includes:
the first end of the base contact is used for connecting with a transformer winding outgoing line, and the second end of the base contact forms a protruding plug;
the socket is positioned at the end part of the conducting rod in the plug-in type transformer bushing, a concave part matched with the convex plug is formed, and a watchband contact finger is arranged in the concave part and is electrically connected with the plug through the watchband contact finger.
Optionally, the base contact and the socket are respectively provided with a temperature measuring optical fiber probe.
Optionally, the plug-in transformer bushing with temperature measurement function further includes:
the detection host is in signal connection with the multi-core temperature measuring optical fiber and is used for acquiring temperature information obtained by measurement of the multi-core temperature measuring optical fiber so as to monitor.
Optionally, the multi-core thermometric optical fiber includes:
the ST joint is used for connecting with the detection host;
the optical fiber cable is used for transmitting optical signals containing temperature information, the periphery of each optical fiber cable is coated with a plurality of layers of protective layers, and a temperature measuring optical fiber probe is arranged at the tail end and used for generating the optical signals through temperature sensing.
Optionally, the plug-in transformer bushing with temperature measurement function further includes:
the photoelectric module is arranged between the ST joint and the detection host and is configured to convert the optical signal into an electric signal; and the detection host is also configured to determine overheat abnormality according to the temperature measured by the multi-core temperature measuring optical fiber and output overheat alarm signals when overheat abnormality occurs.
Alternatively, the number of temperature sensing fiber probes of the multi-core temperature sensing fiber is 10 or more.
The pluggable transformer bushing with the temperature measurement function is introduced into the inner cavity of the base through the multi-core temperature measurement optical fiber from the optical fiber temperature measurement interface of the base flange, and a plurality of temperature measurement optical fiber probes are distributed at different positions of the inner cavity core and the plug head and are used for measuring the temperature of the corresponding positions. Therefore, the temperature information of each position in the inner cavity closed space of the plug-in sleeve base can be accurately obtained, maintenance personnel are assisted in overhauling, vicious circle of overheat and poor contact of plug-in contact points is avoided, and the safety and reliability of long-term operation of the current carrying structure of the plug-in sleeve are ensured.
Furthermore, the pluggable transformer bushing with the temperature measurement function has the advantages that the temperature measurement optical fibers are directly installed in contact with the temperature measurement position, distributed temperature measurement is realized by utilizing a plurality of temperature measurement optical fiber probes, and the temperature measurement is accurate and reliable. Through optimizing the mounting position, the integral temperature distribution condition inside the plug-in transformer bushing can be obtained. The temperature measuring optical fiber has small influence on the structure inside the plug-in transformer bushing, has high temperature tolerance and meets the temperature measuring requirement.
The above, as well as additional objectives, advantages, and features of the present invention will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present invention when read in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:
FIG. 1 is a schematic diagram of a transformer employing a plug-in transformer bushing with temperature measurement according to one embodiment of the invention;
FIG. 2 is a schematic diagram of a pluggable transformer bushing with temperature measurement according to one embodiment of the present invention;
FIG. 3 is a schematic diagram of distribution positions of temperature measuring fiber optic probes in a pluggable transformer bushing with temperature measurement function according to one embodiment of the invention;
FIG. 4 is an enlarged view of a plug head portion of the plug-in transformer bushing shown in FIG. 3; and
fig. 5 is a schematic diagram of a temperature measurement signal of a plug-in transformer bushing 110 with temperature measurement function according to an embodiment of the present invention.
Detailed Description
Fig. 1 is a schematic diagram of a transformer 100 to which a pluggable transformer bushing 110 having a temperature measurement function according to one embodiment of the present invention is applied. The transformer 100 may generally include: transformer tank 101, plug-in transformer bushing 110. Transformer oil 102 is filled in the transformer tank 101, a mounting hole is arranged above the transformer tank 101, and a plug-in transformer bushing 110 is connected with the transformer tank 101 through a flange 113. One end of the plug-in transformer bushing 110 extends into the transformer tank 101. The base structure of the plug-in transformer bushing 110 separates the bushing oil from the transformer oil 102, so that the base cavity 112 and the transformer tank 101 cavity form two independent cavities, which can be electrically connected in a plug-in manner,
fig. 2 is a schematic diagram of a pluggable transformer bushing 110 with temperature measurement function according to one embodiment of the present invention. FIG. 3 is a schematic diagram of the distribution of temperature measurement fiber optic probes 131 in a pluggable transformer bushing 110 with temperature measurement according to one embodiment of the invention. Fig. 4 is an enlarged view of a portion of the plug 120 in the plug-in transformer bushing 110 shown in fig. 3.
The pluggable transformer bushing 110 with temperature measurement function of the present embodiment generally includes: base 111, inner cavity core 150, multicore temperature measurement fiber 130.
A base cavity 112 is defined in the base 111, a first end (generally a top end) of the base 111 is provided with a base flange 113 for fixing with the transformer box 101, and a second end (generally a bottom end) of the base 111 is provided with a plug 120 for connecting with the outgoing line 103 of the transformer winding; an optical fiber temperature measuring interface 114 is arranged at the base flange 113. The second end of the base 111 may penetrate into the transformer tank 101 from above. The fiber optic temperature interface 114 may include a through hole for the optical fiber 130 to penetrate and be sealed by way of a potting compound.
The cavity core 150 is disposed within the base cavity 112; the inner cavity core 150 serves as a sleeve inner insulator and is located outside the conductive rod.
The multi-core temperature measuring fiber 130 is led into the base cavity 112 from the fiber temperature measuring interface 114, and a plurality of temperature measuring fiber probes 131 of the multi-core temperature measuring fiber 130 are distributed and arranged at different positions of the cavity core 150 and the plug 120 for measuring the temperature at corresponding positions.
The temperature measuring optical fiber probes 131 arranged on the inner cavity core 150 can be sequentially arranged along the extending direction (i.e. from top to bottom) from the base flange 113 to the plug 120, so as to realize temperature detection on different positions of the inner cavity core 150. The temperature measurement optical fiber probes 131 can be fixed on the surface of the inner cavity core 150 in an adhesive manner and are bound and fixed by using a binding belt; the temperature measuring optical fiber probe 131 arranged on the plug 120 is fixed to the plug 120 by gluing. The special glue is used for gluing, and the requirement of high temperature resistance and long-term effectiveness is met. The tie is also a special tie.
The temperature measuring optical fiber probe 131 arranged on the plug head 120 is arranged in an area with a set safety distance from the plug contact point.
The inner cavity core 150 may include a straight barrel section 151 and a tapered section 152, the straight barrel section 151 and the tapered section 152 being formed according to the shape of the conductive rod and the sleeve, wherein the straight barrel section 151 is adjacent to the base flange 113, being an upper half section of the inner cavity core 150; while the tapered section 152 extends from the end of the straight barrel section 151 to the plug 120 and tapers in radial dimension, i.e., forms a cone-like configuration from top to bottom. According to the shape construction of the inner cavity core 150, the temperature measuring optical fiber probe 131 is correspondingly arranged, so that the detected temperature can better reflect the temperature distribution in the sleeve. Through a great deal of tests and verification, the sleeve of the present embodiment can set the temperature measuring optical fiber probes 131 arranged on the straight barrel section 151 at equal intervals along the axial direction of the inner cavity core 150. With the arrangement structure, the straight barrel section 151 is far away from the plug 120, and the temperature measuring optical fiber probes 131 are arranged at equal intervals, so that the overall temperature distribution of the straight barrel section 151 can be conveniently known. The sleeve of the present embodiment may further reduce the arrangement interval of the thermometric fiber probes 131 disposed on the tapered section 152 as the axial distance to the plug 120 decreases. The arrangement structure mainly considers that the position of the plug 120 is a main overheat area, and reduces the interval of the temperature measuring optical fiber probe 131 along with approaching to the overheat area, so that the abnormal heating of the sleeve can be recognized more timely.
The plug 120 may include: base contacts 121 and receptacles 122. Wherein the first ends of the base contacts 121 are used to connect the transformer winding lead-out wires 103 and the second ends thereof form protruding plugs. The socket 122 is located at the end of the conductive rod in the plug-in type transformer bushing, forms a concave portion matched with the protruding plug, and is provided with a watchband contact finger 123 inside, and is electrically connected with the plug through the watchband contact finger 123. That is, the base contact 121 serves as a protruding end of the plug 120. The lowermost position of the conductive rod in the sleeve is concave in the plug 120, i.e., the receptacle 122. The female socket 122 has a watchband contact finger 123 disposed therein. The bottom ends of the base contacts 121 are inserted into the watchband contact fingers 123 of the female receptacle 122. The top ends of the base contacts 121 are bolted to the outgoing lines of the transformer windings via terminal blocks.
The base contact 121 and the receptacle 122 may be provided with temperature measuring fiber probes 131, respectively. In some alternative embodiments, the number of fiber optic probes 131 for the multi-core temperature sensing fiber 130 is 10 or more to meet the monitoring needs for the overall temperature inside the sleeve. The number of temperature sensing fiber probes 131 may be configured according to the dimensional specification of the ferrule.
The temperature measurement fiber optic probe 131 can be mounted in direct contact on the base contact 121. The base 111 is generally heated seriously at the joint position of the contact 121 and the contact finger 123, but the space inside the joint position is very narrow, the installation of the temperature measuring optical fiber 130 should consider that the safety distance is kept between the contact finger 123 and the contact finger 121, so that the diameter of the optical fiber probe 131 is selected to be 600um, and in order to meet the requirement of multi-point temperature measurement, 10 or more temperature measuring positions are arranged according to the space of the inner cavity 112 of the sleeve base, and the temperature measured by each temperature measuring optical fiber probe 131 is transmitted back to the same monitoring equipment.
Fig. 5 is a schematic diagram of a temperature measurement signal of a plug-in transformer bushing 110 with temperature measurement function according to an embodiment of the present invention. The pluggable transformer bushing 110 with the temperature measurement function of this embodiment may further include a detection host 140 and a photovoltaic module 141.
The multi-core thermometric optical fiber 130 may include: ST joint 132, a plurality of optical fiber cables 133, and temperature measurement optical fiber probe 131. Wherein ST connector 132 is used to connect to probing host 140. The optical fiber cables 133 are used for transmitting optical signals containing temperature information, the periphery of each optical fiber cable 133 is coated with a plurality of layers of protective layers, and a temperature measuring optical fiber probe 131 is arranged at the tail end of each optical fiber cable 133. The temperature measuring optical fiber 130 can be a quartz optical fiber, and is suitable for the temperature measuring environment of high voltage and strong magnetic field. The ST connector 132 is a connection connector with the photovoltaic module 141. The optical fiber cable 133 is a light transmitting portion, the inside is a quartz optical fiber, the outside of the quartz optical fiber is provided with a coating layer and a cladding layer, and the outermost part is a teflon protective sleeve. The temperature measurement optical fiber probe 131 contains a temperature-sensitive rare earth material, and generates an optical signal containing temperature information. The optical fiber 133 as a whole is resistant to high temperatures of 200℃and has an external diameter of about 3mm. Under the condition that the distance between the outgoing line of the optical fiber 133 and the ground is 0.4m, the optical fiber can withstand power frequency voltage of 100KV for 5min. The measurement precision can be +/-0.01 ℃, and the measurement range can be-40 ℃ to 200 ℃. The diameter of the temperature measuring optical fiber probe 131 is 600um, so that the temperature measuring requirement in a narrow space of the plug 120 is met.
The detecting host 140 is in signal connection with the multi-core temperature measuring optical fiber 130, and is used for acquiring temperature information measured by the multi-core temperature measuring optical fiber 130 for monitoring. The photo-electric module 141 is disposed between the ST connector 132 and the probing host 140, and is configured to convert an optical signal into an electrical signal. The detection host 140 is further configured to determine an overheat abnormality based on the temperature measured by the multi-core thermometry fiber 130, and output an overheat alarm signal when an overheat abnormality occurs. Each temperature measurement fiber probe 131 is pre-assigned with a communication identification. The detection host 140 records the identification and the temperature measurement position of each temperature measurement optical fiber probe 131 in advance, so that the pluggable transformer bushing 110 and the temperature measurement area of the specific temperature measurement optical fiber probe 131 of the pluggable transformer bushing 110 can be identified, and finally all temperature information is summarized and the temperature condition of the pluggable transformer bushing 110 is analyzed and obtained. The detection host 140 can realize real-time monitoring of the temperature of the plug-in transformer bushing 110, so that overheating abnormality can be found in time.
The detection host 140 can be arranged in a monitoring cabinet of the control room and connected with a monitoring computer arranged on an operator console, so that remote monitoring is realized.
The pluggable transformer bushing 110 with the temperature measurement function of the embodiment is provided with the optical fiber temperature measurement interface 114 through the base flange 113, the multi-core temperature measurement optical fibers 130 extend into the base cavity 112, the temperature measurement optical fiber probes 131 are distributed, temperature and position information in the airtight space of the pluggable bushing base cavity 112 can be accurately obtained, maintenance personnel are assisted in overhauling, overheating and bad contact vicious cycle of pluggable contact points are avoided, and long-term operation reliability of the current carrying structure of the pluggable bushing 110 is ensured.
By now it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described herein in detail, many other variations or modifications of the invention consistent with the principles of the invention may be directly ascertained or inferred from the present disclosure without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.
Claims (10)
1. A pluggable transformer bushing with temperature measurement function, comprising:
the base is used for defining a base inner cavity, a first end of the base is provided with a base flange used for being fixed with the transformer box body, and a second end of the base is provided with a plug used for being connected with a lead-out wire of a transformer winding; an optical fiber temperature measuring interface is arranged at the base flange;
the inner cavity core is arranged in the inner cavity of the base;
the multi-core temperature measuring optical fiber is led into the inner cavity of the base from the optical fiber temperature measuring interface, and a plurality of temperature measuring optical fiber probes of the multi-core temperature measuring optical fiber are distributed at different positions of the inner cavity core and the plug head and are used for measuring the temperature of the corresponding position.
2. The pluggable transformer bushing with temperature measurement function according to claim 1, wherein,
the temperature measuring optical fiber probes arranged on the inner cavity core are sequentially distributed along the extending direction from the base flange to the plug head; and is also provided with
The temperature measuring optical fiber probe arranged on the plug head is arranged in an area with a set safety distance from the plug contact point.
3. The pluggable transformer bushing with temperature measurement function according to claim 2, wherein,
the temperature measuring optical fiber probe arranged on the inner cavity core is fixed on the surface of the inner cavity core in an adhesive mode and is bound and fixed by using a binding belt;
the temperature measuring optical fiber probe arranged on the plug head is fixed to the plug head in an adhesive mode.
4. The pluggable transformer bushing with temperature measurement function according to claim 2, wherein,
the inner cavity core comprises: a straight barrel section proximate to the base flange, a tapered section extending from an end of the straight barrel section toward the plug head and tapered in radial dimension; and is also provided with
The temperature measuring optical fiber probes arranged on the straight barrel section are arranged at equal intervals along the axial direction of the inner cavity core;
the temperature measuring optical fiber probes arranged on the tapered section are reduced in arrangement interval along with the reduction of the axial distance from the plug head.
5. The pluggable transformer bushing with temperature measurement function according to claim 1, wherein the plug head comprises:
the first end of the base contact is used for connecting the outgoing line of the transformer winding, and the second end of the base contact forms a protruding plug;
the socket is positioned at the end part of the conducting rod in the plug-in type transformer bushing, a concave part matched with the convex plug is formed, and a watchband contact finger is arranged in the concave part and is electrically connected with the plug.
6. The pluggable transformer bushing with temperature measurement function of claim 5, wherein
The base contact and the socket are respectively provided with the temperature measuring optical fiber probe.
7. The pluggable transformer bushing with temperature measurement function of claim 1, further comprising:
the detection host is in signal connection with the multi-core temperature measuring optical fiber and is used for acquiring temperature information obtained by measuring the multi-core temperature measuring optical fiber so as to monitor.
8. The pluggable transformer bushing with temperature measurement function of claim 7, wherein the multicore temperature measurement fiber includes:
the ST joint is used for connecting the detection host;
the optical fiber cables are used for transmitting optical signals containing the temperature information, the periphery of each optical fiber cable is coated with a plurality of layers of protective layers, the tail end of each optical fiber cable is provided with the temperature measuring optical fiber probe, and the temperature measuring optical fiber probe is used for generating the optical signals through temperature sensing.
9. The pluggable transformer bushing with temperature measurement function of claim 8, further comprising:
the photoelectric module is arranged between the ST joint and the detection host and is configured to convert the optical signal into an electric signal; and is also provided with
The detection host is further configured to determine overheat abnormality according to the temperature measured by the multi-core temperature measuring optical fiber, and output overheat alarm signals when overheat abnormality occurs.
10. The pluggable transformer bushing with temperature measurement function according to claim 1, wherein,
the number of the temperature measuring fiber probes of the multi-core temperature measuring fiber is 10 or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211287999.3A CN116026490A (en) | 2022-10-20 | 2022-10-20 | Plug-in transformer sleeve with temperature measurement function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211287999.3A CN116026490A (en) | 2022-10-20 | 2022-10-20 | Plug-in transformer sleeve with temperature measurement function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116026490A true CN116026490A (en) | 2023-04-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211287999.3A Pending CN116026490A (en) | 2022-10-20 | 2022-10-20 | Plug-in transformer sleeve with temperature measurement function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116026490A (en) |
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2022
- 2022-10-20 CN CN202211287999.3A patent/CN116026490A/en active Pending
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