CN203364992U - Oil-immersed transformer winding temperature measurement system - Google Patents
Oil-immersed transformer winding temperature measurement system Download PDFInfo
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- CN203364992U CN203364992U CN 201320326353 CN201320326353U CN203364992U CN 203364992 U CN203364992 U CN 203364992U CN 201320326353 CN201320326353 CN 201320326353 CN 201320326353 U CN201320326353 U CN 201320326353U CN 203364992 U CN203364992 U CN 203364992U
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Abstract
The utility model discloses an oil-immersed transformer winding temperature measurement system which comprises a current transformer, an oil surface thermometer, a data acquisition device, a microcomputer remote-control device and a dispatch automation main station, wherein the current transformer is connected to the data acquisition device, the oil surface thermometer is connected to the data acquisition device, the output end of the data acquisition device is connected to the microcomputer remote-control device, and the microcomputer remote-control device is further connected to the dispatch automation main station. The oil-immersed transformer winding temperature measurement system measures the temperature of a winding based on a thermal simulation experiment calculation method, can replace a winding thermometer based on the principle of thermal simulation experiment and avoids the problem that the temperature of a winding cannot be accurately measured due to the influence of environmental factors and malfunction of a matching device. With the oil-immersed transformer winding temperature measurement system, operation personnel and monitoring personnel can get an accurate winding temperature value, the working condition of a transformer can be truly reflected, dispatchers and operators are enabled to make a right judgment, and the system is of great significance to safe and stable operation of a power grid.
Description
Technical field
The utility model relates to the power system measuring technical field, specifically oil-immersed power transformer winding temperature measuring system.
Background technology
At present, domestic and international most transformer station all adopts the method for winding temperature gage thermal simulation experiment indirectly to measure the winding temperature of oil-filled transformer.As shown in Figure 1, thermal simulation experiment be by the secondary current Ip of current transformer 1 output after current matching device 4 is adjusted, the heating current Is that output is directly proportional to load, the flow through heating element 5 of setting-in in winding temperature gage, the heat produced makes temperature sensing medium after-expansion occur, thereby make flexible member produce additional displacement, drive pointer and rotate to indicate winding temperature.
Yet find in actual use, there is following problem in the winding temperature gage based on the indirect thermometric of thermal simulation experiment:
The first, the winding temperature gage current matching device easily breaks down and causes the winding temperature measurement inaccurate, and this normal operation to transformer has formed an accident potential.The reason of the current matching device fault of winding temperature gage is in the thermometric process, adaptation is regulated contact oxidation because long-term continuous firing self-heating causes and is caused resistance value to raise, shunting action reduces, and heating current departs from normal value, thereby causes measuring incorrect.
The second, the existence of current return has increased the difficulty of plant maintenance.If the current return open circuit, can cause the damage of equipment, also may form potential safety hazard because of the high pressure that the current return open circuit produces.When thermometer need to be changed, need to do complicated safety practice at current return.
Three, the method for thermal simulation is subject to such environmental effects larger.The weather such as temperature, wind speed reason all can affect the effect of thermal simulation.And winding temperature is to enter in real time supervisory system, dispatcher and operations staff monitor winding temperature by supervisory system, if the winding temperature indication is incorrect, may make the dispatcher make false judgment, affect the safe and stable operation of electrical network.
Four, from the development angle of monitoring device of transformer, utilize winding temperature gage to measure winding temperature, to carry out manual supervisory needs in order to meet traditional transformer station needs from thermometer dial plate reading temperature data, present intelligent substation does not generally need to read at the scene and the recording meter panel temperature data, replaces basic teletransmission data to be processed to determine the winding temperature of monitored transformer.Therefore, utilize the computing method based on thermal simulation experiment, and combine to obtain the Transformer Winding temperature with Automatization Technology in Transformer Substation, mechanics of communication, not only contribute to improve the accuracy of monitoring, also simplified supervisory system and equipment.
The utility model content
The purpose of this utility model is to provide a kind of oil-immersed power transformer winding temperature measuring system, the inaccurate problem of measurement existed to solve traditional winding temperature measuring method, and meet the development need of Intelligent transformer station.
Realize that the technical solution of the utility model is as follows: a kind of oil-filled transformer winding temperature measuring system, comprise current transformer 1, oil surface temperature meter 3, data collector, microcomputer telecontrol device and dispatching automation main website, described current transformer 1 is connected to data collector, oil surface temperature meter 3 is connected to data collector, the output terminal of data collector is connected to the microcomputer telecontrol device, and the microcomputer telecontrol device is also connected to the dispatching automation main website.Wherein, data collector comprises current transformer signal input part, oil surface temperature input end, the first isolator, the second isolator, single-chip microcomputer and communication module; Described current transformer 1 is connected to the current transformer signal input part, and the current transformer signal input part is connected to single-chip microcomputer by the first isolator; Described oil surface temperature meter 3 is connected to the oil surface temperature input end, and the oil surface temperature input end is connected to single-chip microcomputer by the second isolator; Communication module one end is connected to single-chip microcomputer, the output terminal of other end composition data harvester.
In technique scheme, the measurement of Transformer Winding temperature is based on the thermal simulation experiment computing method.The step of thermal simulation experiment computing method is as follows:
Step 1: rated capacity S, rated voltage U summation current transformer rated transformation ratio N according to transformer to be measured calculate the rated secondary current I under transformer rated load to be measured
p,
Step 2: the copper oil temperature difference T according to transformer to be measured under rated load, inquiry thermal simulation characteristic-temperature rise and electric stream correspondence table, draw specified heating current I
s;
Step 3: calculate rated secondary current I
pwith specified heating current I
sratio m, m=I
p/ I
s;
Step 4: the actual secondary current I that measures current transformer output
p';
Step 5: calculate actual heating current I
s', I
s'=I
p'/m;
Step 6: according to actual heating current I
s', inquiry thermal simulation characteristic-temperature rise and electric stream correspondence table, draw actual copper oil temperature difference T';
Step 7: the actual top-oil temperature T that measures transformer to be measured
oil;
Step 8: calculate Transformer Winding temperature T to be measured
around, T
around=T
oil+ Δ T'.
Thermal simulation experiment calculates ratio juris: the oil-immersed power transformer winding temperature can be equivalent on the basis of top-oil temperature, and the additional temperature rise that superposes can obtain the medial temperature of Transformer Winding.The heating current that secondary current of exporting with mutual inductor on transformer of thermal cycle simulation output is directly proportional is to heating element, just can produce one numerically with the poor additional temperature rise equated of copper oil temperature.Because secondary current is directly proportional to heating current, so under the transformer rated load, the ratio of secondary current and heating current, equal the ratio of secondary current and heating current under the transformer actual load.According to this ratio, just can obtain the additional temperature rise under actual load, and this additional temperature rise equates with the copper oil temperature difference value under the transformer actual load.Therefore, be superimposed with actual top-oil temperature by the copper oil temperature is poor, can obtain the winding medial temperature of transformer.According to the company standard Q/GDW440-2010 of State Grid Corporation of China " oil-filled transformer temperature measuring equipment field calibration standard ", the additional temperature rise that thermal cycle simulation produces should meet the regulation of following table.
Table 1: thermal simulation characteristic---temperature rise and electric stream correspondence table
In the thermal simulation experiment computing method, need to obtain rated capacity S, the rated voltage U summation current transformer rated transformation ratio N of transformer to be measured, and secondary current and top-oil temperature under the actual load of transformer to be measured, coordinate thermal simulation characteristic--temperature rise and electric stream correspondence table, can draw the winding temperature of transformer.Wherein, rated capacity S, rated voltage U summation current transformer rated transformation ratio N are the known parameters of transformer to be measured, so also need to measure secondary current and top-oil temperature under the actual load of transformer to be measured.
In the utility model, secondary current under the actual load of current transformer 1 output transformer to be measured, oil surface temperature meter 3 output top-oil temperatures, these two simulating signals become digital signal after by the data collector timing acquiring, be input to the microcomputer telecontrol device of transformer station, the microcomputer telecontrol device is transferred to the dispatching automation main website by Ethernet after processing, and dispatching automation main website operation upper computer software, draw winding temperature.
Technique effect of the present utility model is: 1, the utility model is measured winding temperature based on the thermal simulation experiment computing method, can replace the winding temperature gage based on the thermal simulation experiment principle, avoid winding temperature gage because being subject to such environmental effects and adaptation fault to cause the problem that winding temperature can't Measurement accuracy.Simultaneously, financial cost and maintenance cost can have greatly been saved; 2, adopt the utility model, operations staff and monitor staff can obtain winding temperature value accurately, truly reflect the working condition of transformer, allow dispatcher and operations staff make accurate judgment, significant to power network safety operation.
The accompanying drawing explanation
Fig. 1 is the schematic diagram that the winding temperature gage thermal simulation experiment is measured winding temperature.
Fig. 2 is system construction drawing of the present utility model.
Fig. 3 is the system construction drawing of data collector.
Embodiment
As Fig. 2, current transformer 1 is connected to data collector, exports the secondary current under the actual load of transformer to be measured.The oil surface temperature meter is selected AKM series.The temperature sensor 2 of oil surface temperature meter 3 is inserted in the thermometer base that is positioned over the transformer top, and the remote transfer signal connecting terminals of oil surface temperature meter 3 is received data collector, and output characterizes the current signal of transformer oil surface temperature to be measured.The system architecture of data collector as shown in Figure 3, comprises current transformer signal input part, oil surface temperature input end, the first isolator, the second isolator, single-chip microcomputer and communication module; Current transformer 1 is connected to the current transformer signal input part, and the current transformer signal input part is connected to single-chip microcomputer by the first isolator; Oil surface temperature meter 3 is connected to the oil surface temperature input end, and the oil surface temperature input end is connected to single-chip microcomputer by the second isolator; Communication module one end is connected to single-chip microcomputer, the output terminal of other end composition data harvester.The simulating signal of secondary current and oil surface temperature enters single-chip microcomputer by isolator, and the aftertreatment of single-chip microcomputer timing acquiring is digital signal, then is transferred to the microcomputer telecontrol device of transformer station by communication module.The microcomputer telecontrol device arrives the dispatching automation main website by fiber optic Ethernet by digital data transmission.The model of microcomputer telecontrol device is that the WYD-803A(Henan information company limited that permitted to continue produces).The dispatching automation main website is the system platform consisted of dispatch automated system server, workstation, system software etc., there are data acquisition monitoring function and senior application function etc., mainly acquisition and processing substation information, comprising the orders such as the remote control that issues substation, remote regulating, is the core of dispatch automated system.The rated capacity of the preset transformer to be measured of upper computer software of dispatching automation main website, rated voltage summation current transformer rated transformation ratio, thermal simulation characteristic---the information such as temperature rise and electric stream correspondence table, receive secondary current and oil surface temperature, in real time the calculating transformer winding temperature simultaneously.
Claims (3)
1. an oil-filled transformer winding temperature measuring system, it is characterized in that, comprise current transformer (1), oil surface temperature meter (3), data collector, microcomputer telecontrol device and dispatching automation main website, described current transformer (1) is connected to data collector, oil surface temperature meter (3) be connected to data collector, the output terminal of data collector is connected to the microcomputer telecontrol device, and the microcomputer telecontrol device is also connected to the dispatching automation main website.
2. oil-filled transformer winding temperature measuring system according to claim 1, it is characterized in that, described data collector comprises current transformer signal input part, oil surface temperature input end, the first isolator, the second isolator, single-chip microcomputer and communication module; Described current transformer (1) is connected to the current transformer signal input part, and the current transformer signal input part is connected to single-chip microcomputer by the first isolator; Described oil surface temperature meter (3) is connected to the oil surface temperature input end, and the oil surface temperature input end is connected to single-chip microcomputer by the second isolator; Communication module one end is connected to single-chip microcomputer, the output terminal of other end composition data harvester.
3. any one oil-filled transformer winding temperature measuring system according to claim 1 and 2, is characterized in that, described oil surface temperature is counted AKM series, and described microcomputer telecontrol device model is WYD-803A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320326353 CN203364992U (en) | 2013-06-06 | 2013-06-06 | Oil-immersed transformer winding temperature measurement system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320326353 CN203364992U (en) | 2013-06-06 | 2013-06-06 | Oil-immersed transformer winding temperature measurement system |
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| Publication Number | Publication Date |
|---|---|
| CN203364992U true CN203364992U (en) | 2013-12-25 |
Family
ID=49812738
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320326353 Expired - Lifetime CN203364992U (en) | 2013-06-06 | 2013-06-06 | Oil-immersed transformer winding temperature measurement system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203364992U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104501980A (en) * | 2015-01-16 | 2015-04-08 | 成都城电电力工程设计有限公司 | Transformer winding temperature measuring device |
| CN111426404A (en) * | 2020-04-06 | 2020-07-17 | 甘书宇 | Transformer temperature measuring system and measuring method |
-
2013
- 2013-06-06 CN CN 201320326353 patent/CN203364992U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104501980A (en) * | 2015-01-16 | 2015-04-08 | 成都城电电力工程设计有限公司 | Transformer winding temperature measuring device |
| CN111426404A (en) * | 2020-04-06 | 2020-07-17 | 甘书宇 | Transformer temperature measuring system and measuring method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131225 |