CN114200910A - Calibrating device and method for transformer winding temperature controller - Google Patents
Calibrating device and method for transformer winding temperature controller Download PDFInfo
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- CN114200910A CN114200910A CN202111430281.0A CN202111430281A CN114200910A CN 114200910 A CN114200910 A CN 114200910A CN 202111430281 A CN202111430281 A CN 202111430281A CN 114200910 A CN114200910 A CN 114200910A
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- 238000004804 winding Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000012795 verification Methods 0.000 claims abstract description 31
- 230000006698 induction Effects 0.000 claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 238000004088 simulation Methods 0.000 claims abstract description 8
- 238000005485 electric heating Methods 0.000 claims description 13
- 238000005259 measurement Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 abstract description 6
- 238000009434 installation Methods 0.000 abstract description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0208—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the configuration of the monitoring system
- G05B23/0213—Modular or universal configuration of the monitoring system, e.g. monitoring system having modules that may be combined to build monitoring program; monitoring system that can be applied to legacy systems; adaptable monitoring system; using different communication protocols
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24065—Real time diagnostics
Abstract
The application discloses calibrating installation and method of transformer winding temperature controller, wherein calibrating installation includes: the device comprises a simulation temperature furnace, a current transformer, an induction component, a capillary tube, a temperature controller and a verification controller; the temperature calibrating device comprises a current transformer, a temperature controller, a temperature calibrating controller, a temperature sensor and a temperature controller, wherein the temperature calibrating controller is connected with the output end of the current transformer and the input end of the temperature sensor respectively, the temperature sensor is used for measuring the temperature in the temperature calibrating controller, outputs the temperature rise to the temperature calibrating controller after conversion, and outputs a pointer indication value according to the temperature rise. According to the method and the device, the average temperature of the transformer winding obtained through calculation by simulating an additional temperature rise is used for replacing a traditional standard thermometer, so that accidental errors caused by human factors and error types needing to be considered during calculation can be reduced, and the verification precision is improved.
Description
Technical Field
The invention relates to the field of power instrument verification, in particular to a verification device and method for a transformer winding temperature controller.
Background
The transformer winding temperature controller is a special instrument for measuring and controlling the temperature of a transformer winding, is used for measuring the temperature of a transformer, and has multiple functions of starting and stopping a transformer cooling system, warning a forenotice signal, tripping an accident and the like, so that the remote monitoring and control of the operation condition of the transformer are realized, and the transformer winding temperature controller is one of important protection devices of the transformer. In order to ensure the normal operation of the temperature controller and the realization of various functions, the temperature controller needs to be periodically checked according to the operation condition of the transformer so as to judge whether technical indexes such as indication error, return error, set point error, switching error and the like are qualified.
In the prior art, technical indexes such as indication errors, return errors, set point errors and switching differences need to be calibrated for the transformer winding temperature controller, and the situation that the temperature of the transformer winding cannot be directly measured and is influenced by the oil temperature of the transformer due to the arrangement of a measuring probe occurs in the actual calibration process of the indication errors, so that the indication calibration deviation of the transformer winding temperature controller is directly large.
Disclosure of Invention
The embodiment of the application provides a calibrating device and a calibrating method for a transformer winding temperature controller, which are used for improving the calibrating precision of the transformer winding temperature controller.
The first aspect of the embodiments of the present application provides a calibrating apparatus for a transformer winding temperature controller, including: the device comprises a simulation temperature furnace, a current transformer, an induction component, a capillary tube, a temperature controller and a verification controller;
the temperature calibrating device comprises a current transformer, a temperature controller, a temperature calibrating controller, a temperature sensor and a temperature controller, wherein the temperature calibrating controller is connected with the output end of the current transformer and the input end of the temperature sensor respectively, the temperature sensor is used for measuring the temperature in the temperature calibrating controller, outputs the temperature rise to the temperature calibrating controller after conversion, and outputs a pointer indication value according to the temperature rise.
Optionally, the temperature controller includes a converter and an electric heating element, an input end of the converter is connected to the electric heating element, and the electric heating element is used for outputting the temperature rise to the verification controller.
Optionally, the ac unit adjusts the working current according to the load condition of the transformer.
Optionally, the verification controller outputs a pointer indication value larger than the temperature value in the simulated temperature furnace according to the temperature rise.
Optionally, the simulated temperature furnace is a simulated transformer, and all measurement values of the simulated temperature furnace represent measurement values of the transformer.
Optionally, the additional temperature rise error value of the temperature controller is obtained according to the measured temperature value of the simulated temperature furnace, the temperature rise value generated by the electric heating element and the pointer indication value output by the verification controller.
A second aspect of the embodiments of the present application provides a method for calibrating a transformer winding temperature controller, including: the device comprises a simulation temperature furnace, a current transformer, an induction component, a capillary tube, a temperature controller and a verification controller; the analog temperature furnace is respectively connected with the output end of the current transformer and the input end of the induction component, the induction component is used for measuring the temperature in the analog temperature furnace, the output end of the induction component is connected with the capillary tube to output the measured temperature to the temperature controller, the temperature controller outputs the generated temperature rise to the verification controller after conversion, and the verification controller outputs a pointer indication value according to the temperature rise;
when the transformer is loaded, the temperature controller obtains rated current output by the current transformer, outputs working current corresponding to the rated current after exchanging according to built-in components, and completes verification of the temperature controller after obtaining additional temperature rise errors according to the temperature value of the simulated temperature furnace, the temperature rise value generated by the working current and the pointer indication value output by the verification controller.
According to the technical scheme, the embodiment of the application has the following advantages:
the utility model provides a calibrating installation of transformer winding temperature controller obtains transformer winding's average temperature through calculating through additional temperature rise of simulation, and is specific, current transformer CT secondary output current to analog temperature stove, and the temperature rise of transmission to temperature controller, temperature controller inner part production to make the reading of examination controller control temperature controller. At the moment, the indication error of the transformer can be calculated according to the reading of the temperature controller, the actual temperature of the analog temperature furnace and the generated temperature rise, so that the use of a traditional standard thermometer is replaced by a processing method of converting the temperature into analog quantity and then converting the analog quantity into digital quantity by AD, accidental errors caused by human factors and error types needing to be considered during calculation can be reduced, and the verification precision is improved.
Drawings
FIG. 1 is a schematic system diagram of a calibrating apparatus for a transformer winding temperature controller according to an embodiment of the present application;
fig. 2 is a schematic diagram of a system structure of a transformer winding temperature controller in the embodiment of the present application.
Detailed Description
The embodiment of the application provides a calibrating device and a calibrating method for a transformer winding temperature controller, which are used for improving the calibrating precision of the transformer winding temperature controller.
The technical solutions in the present application will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1 to 2, a first aspect of the present application provides an embodiment of a calibrating apparatus for a transformer winding temperature controller, including:
the device comprises a simulation temperature furnace 1, a current transformer 2, an induction component 3, a capillary tube 4, a temperature controller 5 and a verification controller 6; the temperature calibrating device comprises a simulated temperature furnace 1, a sensing component 3, a temperature controller 6 and a transformer winding temperature controller, wherein the simulated temperature furnace 1 is respectively connected with the output end of a current transformer 2 and the input end of the sensing component 3, the sensing component 3 is used for measuring the temperature in the simulated temperature furnace 1, the output end of the sensing component 3 is connected with a capillary tube 4 to output the measured temperature to the temperature controller 5, the temperature controller 5 outputs the generated temperature rise to the calibrating controller 6 after conversion, and the calibrating precision of the transformer winding temperature controller is judged according to numerical calculation when the calibrating controller 6 outputs a pointer indication value according to the temperature rise.
In practical application, the temperature bulb of the winding temperature controller is inserted into an oil hole in the top layer of an oil tank of the transformer, wherein the temperature bulb is completely soaked by transformer oil, and when the transformer is not loaded, the degree of the winding temperature controller is the temperature of the transformer oil. When the transformer is loaded, current which is taken out by the transformer current transformer 2 and is in direct proportion to the load exchanges current through a built-in part of the temperature controller, the winding temperature of the transformer to be tested is reflected by indicating the sum of the oil temperature of the top layer of the transformer and the temperature rise of the winding to the oil, but the induction part cannot directly measure the winding temperature of the transformer in the actual verification process, so that the indication value verification deviation of the transformer winding temperature controller is easy to cause.
In this embodiment, the average temperature of the transformer windings is calculated by simulating an additional temperature rise. Specifically, the secondary rated current value Ip of the CT of the transformer current transformer 2 can be obtained by referring to the transformer specification, the rated current value Ip Is output by the current transformer 2 to the temperature controller 5, the temperature controller 5 outputs the converted current Is according to the conversion of the built-in components, and the Ip/Is verification can be completed by measuring the actual value of the temperature corresponding to the Is. Therefore, the processing method of converting the temperature into the analog quantity and then converting the analog quantity into the digital quantity by the AD replaces the use of the traditional standard thermometer, so that accidental errors caused by human factors and error types needing to be considered during calculation can be reduced, and the verification precision is improved.
Optionally, the temperature controller 5 includes an ac 51 and an electric heating element 52, when the transformer is loaded, the current proportional to the load and taken out by the transformer current transformer 2 is adjusted by the ac 51, wherein the electric current 51 adjusts the working current according to the loading condition of the transformer, the adjusted working current flows through the electric heating element 52 embedded in the corrugated pipe, the electric heating element 52 generates heat, so that the elastic element generates an additional displacement amount, the displacement amount is determined by both the oil on the top layer of the transformer and the load current of the transformer, the displacement amount of the elastic element is amplified by the mechanism, the controller pushes the mechanical pointer of the instrument to display the field temperature, and simultaneously drives the coaxial potentiometer to rotate, and the temperature transmitter outputs a dc current or a dc voltage proportional to the mechanical indication temperature.
Optionally, under a normal working environment of the transformer, the verification controller 6 controls the transformer pointer according to the obtained current after temperature rise and the resistance measurement condition, and power workers observe and record temperature changes of an oil surface and a winding of the transformer from a display screen controlled by the controller in daily life.
Optionally, the simulated temperature furnace 1 is a simulated transformer, so that a winding temperature controller program and an environment for calibrating the transformer are simplified, the temperature in the transformer is converted into an analog quantity, wherein the simulated temperature furnace comprises the temperature of oil and the temperature of a winding, so that the temperature rise of the winding to the oil is compensated, and in addition, an additional temperature rise error value of the finally obtained temperature controller is obtained according to a measured value of the simulated temperature furnace, a temperature rise value generated by an electric heating element and a pointer indication value output by the calibration controller.
A second aspect of the present application provides an embodiment of a method for calibrating a transformer winding temperature controller, including:
the device comprises a simulation temperature furnace 1, a current transformer 2, an induction component 3, a capillary tube 4, a temperature controller 5 and a verification controller 6; wherein the analog temperature furnace 1 is respectively connected with the output end of the current transformer 2 and the input end of the induction component 3, the induction component 3 is used for measuring the temperature in the analog temperature furnace 1, the output end of the induction component 3 is connected with the capillary 4 to output the measured temperature to the temperature controller 5, the temperature controller 5 outputs the generated temperature rise to the verification controller 6 after conversion, and the verification controller 6 outputs the temperature rise to the verification controller 6 according to the temperature rise measured by the temperature controller 5The temperature rise output pointer shows the value. Specifically, the temperature controller 5 obtains the rated current Ip output by the current transformer 2, and the temperature T obtained by measuring the temperature T of a bulb arranged in the simulated temperature furnace 1 through the capillary tube 40Is transmitted to the temperature controller 5, wherein T0The standard PT100 thermal resistance measurement can be used, when the transformer Is loaded, the current Is adjusted by the current transformer 51 arranged in the temperature controller 5 to heat the electric heating element 52, and the temperature rise Is measured by delta TSThis temperature rise value can be calculated from the table in JB/T-8450. In this case, the temperature value T corresponding to Is theoretically equal to T0+△TSThe device is measured bySTo convert the value T, at the moment, the reading T of the temperature controllerSThe additional temperature rise error delta T of the temperature-measured controller is detectedWCan be represented by the formula Δ TW＝TS–T0–△TSAnd (6) obtaining the calculation and completing the verification.
It is intended that the foregoing description of the disclosed embodiments enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. The calibrating device of the transformer winding temperature controller is characterized by comprising:
the device comprises a simulation temperature furnace, a current transformer, an induction component, a capillary tube, a temperature controller and a verification controller;
the temperature calibrating device comprises a current transformer, a temperature controller, a temperature calibrating controller, a temperature sensor and a temperature controller, wherein the temperature calibrating controller is connected with the output end of the current transformer and the input end of the temperature sensor respectively, the temperature sensor is used for measuring the temperature in the temperature calibrating controller, outputs the temperature rise to the temperature calibrating controller after conversion, and outputs a pointer indication value according to the temperature rise.
2. The calibrating device for the transformer winding temperature controller according to claim 1, wherein the temperature controller comprises an ac unit and an electric heating element, an input end of the ac unit is connected with the electric heating element, and the electric heating element is used for outputting a temperature rise to the calibrating controller.
3. The calibrating device for the winding temperature controller of the transformer as claimed in claim 2, wherein the ac unit adjusts the operating current according to the load condition of the transformer.
4. The calibrating apparatus for a transformer winding temperature controller according to claim 1, wherein the pointer indication value outputted by said calibrating controller according to said temperature rise is larger than the temperature value in said simulated temperature furnace.
5. The calibrating apparatus for a transformer winding temperature controller according to claim 1, wherein the analog temperature furnace is an analog transformer, and all measurement values of the analog temperature furnace represent measurement values of the transformer.
6. The calibrating apparatus for transformer winding temperature controller according to any one of claims 1 to 5, wherein the additional temperature rise error value of the temperature controller is obtained according to the measured temperature value of the simulated temperature furnace, the temperature rise value generated by the electric heating element and the indication pointer value output by the calibrating controller.
7. A calibration method for a transformer winding temperature controller is characterized by comprising the following steps:
the device comprises a simulation temperature furnace, a current transformer, an induction component, a capillary tube, a temperature controller and a verification controller;
the analog temperature furnace is respectively connected with the output end of the current transformer and the input end of the induction component, the induction component is used for measuring the temperature in the analog temperature furnace, the output end of the induction component is connected with the capillary tube to output the measured temperature to the temperature controller, the temperature controller outputs the generated temperature rise to the verification controller after conversion, and the verification controller outputs a pointer indication value according to the temperature rise;
when the transformer is loaded, the temperature controller obtains rated current output by the current transformer, outputs working current corresponding to the rated current after exchanging according to built-in components, and completes verification of the temperature controller after obtaining additional temperature rise errors according to the temperature value of the simulated temperature furnace, the temperature rise value generated by the working current and the pointer indication value output by the verification controller.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111430281.0A CN114200910A (en) | 2021-11-29 | 2021-11-29 | Calibrating device and method for transformer winding temperature controller |
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| CN202111430281.0A CN114200910A (en) | 2021-11-29 | 2021-11-29 | Calibrating device and method for transformer winding temperature controller |
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|---|---|---|---|---|
| CN103148965A (en) * | 2013-02-26 | 2013-06-12 | 广东电网公司电力科学研究院 | Temperature rise characteristic field testing method of thermal simulation device of transformer winding temperature controller |
| CN103292920A (en) * | 2013-05-14 | 2013-09-11 | 国家电网公司 | Matcher for winding thermometer |
| CN104198067A (en) * | 2014-08-22 | 2014-12-10 | 国家电网公司 | Winding temperature measuring method for transformer |
| CN204142392U (en) * | 2014-08-04 | 2015-02-04 | 国家电网公司 | Portable transformer winding temperature table tester |
| CN106840461A (en) * | 2016-07-20 | 2017-06-13 | 国家电网公司 | A kind of transformer reactance device temperature protective device in-situ check and test method |
| CN111929618A (en) * | 2020-08-25 | 2020-11-13 | 广东电网有限责任公司 | Transformer monitoring method and monitoring system |
-
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- 2021-11-29 CN CN202111430281.0A patent/CN114200910A/en active Pending
Patent Citations (6)
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| CN103148965A (en) * | 2013-02-26 | 2013-06-12 | 广东电网公司电力科学研究院 | Temperature rise characteristic field testing method of thermal simulation device of transformer winding temperature controller |
| CN103292920A (en) * | 2013-05-14 | 2013-09-11 | 国家电网公司 | Matcher for winding thermometer |
| CN204142392U (en) * | 2014-08-04 | 2015-02-04 | 国家电网公司 | Portable transformer winding temperature table tester |
| CN104198067A (en) * | 2014-08-22 | 2014-12-10 | 国家电网公司 | Winding temperature measuring method for transformer |
| CN106840461A (en) * | 2016-07-20 | 2017-06-13 | 国家电网公司 | A kind of transformer reactance device temperature protective device in-situ check and test method |
| CN111929618A (en) * | 2020-08-25 | 2020-11-13 | 广东电网有限责任公司 | Transformer monitoring method and monitoring system |
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