CN111289135A - Anti-interference RTD measurement circuit - Google Patents
Anti-interference RTD measurement circuit Download PDFInfo
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- CN111289135A CN111289135A CN202010258527.XA CN202010258527A CN111289135A CN 111289135 A CN111289135 A CN 111289135A CN 202010258527 A CN202010258527 A CN 202010258527A CN 111289135 A CN111289135 A CN 111289135A
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- rtd
- point
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- monitoring
- control
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
- G01K7/20—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer in a specially-adapted circuit, e.g. bridge circuit
- G01K7/21—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer in a specially-adapted circuit, e.g. bridge circuit for modifying the output characteristic, e.g. linearising
Abstract
The invention relates to an anti-interference RTD measurement loop. The temperature measurement terminal box is connected with the monitoring AI module through the RTD transfer joint, the temperature measurement terminal box and the monitoring AI module, the RTD transfer joint and the temperature measurement terminal box are also grounded at an anti-interference single end, a point C of the monitoring terminal box is in short circuit with a point B, the point A is connected with the point B through a filter capacitor, the point C is a power supply terminal of the monitoring terminal box and is connected with a power supply of the monitoring AI module, the point B is a R3 bridge arm of the monitoring terminal box and the monitoring AI module and is connected to a terminal, and the point A is a third terminal connected with the monitoring AI module. The invention effectively solves the problem that RTD signals of the stator bar in a low-rotating-speed interval of the unit are interfered.
Description
Technical Field
The invention relates to an anti-interference RTD measurement loop.
Background
The pumped storage power station set has the functions of generating/pumping two-way operation and starting along with adjustment, and the RTD of the stator bar arranged between the stator bar gaps of the generator/motor is an important monitoring element of the generator/motor. When the unit is started at a low rotating speed in the pumping direction and runs at a low rotating speed in the electric braking direction in the generating direction, rated no-load exciting current is applied to the rotor, low-frequency alternating harmonic waves are induced on the stator, and if the harmonic waves are superposed on an RTD temperature measurement loop, RTD signals of the stator bars can shake violently under the influence of wind tunnel electromagnetic interference, so that RTD temperature measurement results are influenced. In order to solve the phenomenon, the inventor of the application effectively solves the problem that RTD signals of the stator bar in a low rotating speed interval of a unit are interfered by improving a capacitance differential mode anti-interference measurement circuit and optimizing monitoring parameters.
Disclosure of Invention
The invention aims to provide an anti-interference RTD measurement circuit, which effectively solves the problem that RTD signals of a stator bar in a low-rotating-speed interval of a machine set are interfered.
In order to achieve the purpose, the technical scheme of the invention is as follows: the utility model provides an anti-interference RTD measures return circuit, includes stator bar RTD, RTD transfer joint, temperature measurement terminal box, control terminal row, control AI module, and stator bar RTD adopts three-wire system connection method, and stator bar RTD passes through RTD transfer joint, temperature measurement terminal box, and control terminal row is connected with control AI module, and RTD transfer joint, temperature measurement terminal box still have anti-interference single-ended ground connection, the C point and the short circuit of control terminal row, pass through filter capacitance between A point and the B point and be connected, wherein, C point is the power supply terminal of control terminal row, and it is connected with the power of control AI module, and B point is that control terminal row is connected to the terminal with the R3 bridge arm of control AI module, and A point is the third terminal that control terminal row and control AI module are connected.
In an embodiment of the invention, in the monitoring AI module, the loop resistance reduced after the point C and the point B of the monitoring terminal row are short-circuited needs to be compensated by a program, that is, the temperature measurement result of the RTD of the stator bar is increased by 2-3 degrees in the monitoring AI module.
Compared with the prior art, the invention has the following beneficial effects: the invention utilizes the improved differential mode anti-interference capacitance connection method and the program and the parameters of the monitoring system for optimization, thereby ensuring that RTD signals of all stator bars can not be subjected to electromagnetic interference when a unit is electrically braked and pumped to drag low rotating speed, realizing the measurement accuracy and simultaneously reducing the using number of filter capacitors. The correctness and the effectiveness of the temperature measuring loop are fully verified through field operation observation.
Drawings
FIG. 1 is a conventional stator bar RTD temperature loop.
FIG. 2 is a schematic diagram of RTD temperature measurement.
FIG. 3 is a stator bar RTD temperature loop of the present invention.
FIG. 4 is an equivalent circuit diagram of a program compensated stator bar RTD temperature loop.
Detailed Description
The technical scheme of the invention is specifically explained below with reference to the accompanying drawings.
The invention provides an anti-interference RTD measurement loop which comprises a stator bar RTD, an RTD transfer joint, a temperature measurement terminal box, a monitoring terminal row and a monitoring AI module, wherein the stator bar RTD adopts a three-wire connection method, the stator bar RTD is connected with the monitoring AI module through the RTD transfer joint, the temperature measurement terminal box and the monitoring terminal row, the RTD transfer joint and the temperature measurement terminal box are also connected with an anti-interference single-end ground, a point C of the monitoring terminal row is in short circuit with a point B, the point A and the point B are connected through a filter capacitor, the point C is a power supply terminal of the monitoring terminal row and is connected with a power supply of the monitoring AI module, the point B is a terminal connected with an R3 bridge arm of the monitoring AI module, and the point A is a third terminal connected with the monitoring AI module.
In the monitoring AI module, the loop resistance reduced after the C point and the B point of the monitoring terminal row are short-circuited needs to be compensated through a program, namely, the RTD temperature measurement result of the stator bar is increased by 2-3 degrees in the monitoring AI module.
The following is a specific implementation of the present invention.
FIG. 1 is a conventional stator bar RTD temperature loop and FIG. 2 is the RTD temperature principle. The RTD adopts three-wire system connection method, has passed through the terminal strip of transit joint, temperature measurement terminal box and control dish cabinet to the control AI module. And an anti-interference single-ended ground is arranged between the temperature measurement terminal box and the RTD transfer joint.
Because the set is started at a low rotating speed in the pumping direction and runs at a low rotating speed in the electric braking direction in the generating direction, rated no-load exciting current is applied to the rotor, low-frequency alternating harmonic waves are induced on the stator, and if the harmonic waves are superposed on an RTD temperature measuring loop, temperature measuring signal jitter is caused.
To this end, the present invention improves the stator bar RTD temperature loop, i.e., optimizes the RTD differential mode de-interference, as shown in FIG. 3 for the stator bar RTD temperature loop of the present invention. In order to reduce the jitter RTD anti-interference capacitance, the power supply terminals of 3 RTD connection cables and the terminal led out by an R3 bridge arm are in short circuit (namely, the point C is in short circuit with the point B) at the monitoring temperature measurement terminal row, and after the short circuit, a selected filter capacitance is added between the point A and the point B. The number of filter capacitors can be reduced by the method.
Further, since there is a long distance from the monitoring module to the RTD installation site, the line resistance of the wire cannot be ignored, so it is necessary to compensate for the reduced loop resistance due to the short circuit between the point C and the point B in the monitoring system. As shown in FIG. 4, after calculation, field measurement and verification, 2-3 degrees of compensation is required before optimization of the improved differential mode interference rejection ratio, that is, 2-3 degrees are added in the monitoring system program.
The invention utilizes the improved differential mode anti-interference capacitance connection method and the program and the parameters of the monitoring system for optimization, thereby ensuring that RTD signals of all stator bars can not be subjected to electromagnetic interference when a unit is electrically braked and pumped to drag low rotating speed, realizing the measurement accuracy and simultaneously reducing the using number of filter capacitors. The correctness and the effectiveness of the temperature measuring loop are fully verified through field operation observation.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.
Claims (2)
1. The utility model provides an anti-interference RTD measurement circuit, including stator bar RTD, RTD transfer joint, temperature measurement terminal box, control terminal row, control AI module, stator bar RTD adopts three-wire system connection method, stator bar RTD passes through RTD transfer joint, temperature measurement terminal box, control terminal row and is connected with control AI module, RTD transfer joint, temperature measurement terminal box still have anti-interference single-ended ground, a serial communication port, C point and the short circuit of B point of control terminal row, be connected through filter capacitance between A point and B point, wherein, C point is the power supply terminal of control terminal row, it is connected with the power of control AI module, B point is that control terminal row is connected to the terminal with the R3 bridge arm of control AI module, A point is the third terminal that control terminal row and control AI module are connected.
2. The anti-interference RTD measurement circuit of claim 1, wherein in the monitoring AI module, the reduced loop resistance after the C point and the B point of the monitoring terminal row are short-circuited needs to be compensated by a program, that is, the RTD temperature measurement result of the stator bar is increased by 2-3 degrees in the monitoring AI module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010258527.XA CN111289135A (en) | 2020-04-03 | 2020-04-03 | Anti-interference RTD measurement circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010258527.XA CN111289135A (en) | 2020-04-03 | 2020-04-03 | Anti-interference RTD measurement circuit |
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| Publication Number | Publication Date |
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| CN111289135A true CN111289135A (en) | 2020-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010258527.XA Pending CN111289135A (en) | 2020-04-03 | 2020-04-03 | Anti-interference RTD measurement circuit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1402413A (en) * | 2002-09-13 | 2003-03-12 | 西安交通大学 | Electric machine stator wire bar multifactor ageing device and method |
| EP2357769A3 (en) * | 2002-10-25 | 2013-05-08 | Qualcomm Incorporated | Channel calibration for a time division duplexed communication system |
| CN103808424A (en) * | 2012-11-06 | 2014-05-21 | 姜韫英 | RTD temperature detection system |
| CN104236743A (en) * | 2013-06-21 | 2014-12-24 | 上海辰竹仪表有限公司 | One-point calibration temperature measuring system |
| CN204594584U (en) * | 2015-05-15 | 2015-08-26 | 中国长江电力股份有限公司 | A kind of generator temperature measurement on-line device |
-
2020
- 2020-04-03 CN CN202010258527.XA patent/CN111289135A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1402413A (en) * | 2002-09-13 | 2003-03-12 | 西安交通大学 | Electric machine stator wire bar multifactor ageing device and method |
| EP2357769A3 (en) * | 2002-10-25 | 2013-05-08 | Qualcomm Incorporated | Channel calibration for a time division duplexed communication system |
| CN103808424A (en) * | 2012-11-06 | 2014-05-21 | 姜韫英 | RTD temperature detection system |
| CN104236743A (en) * | 2013-06-21 | 2014-12-24 | 上海辰竹仪表有限公司 | One-point calibration temperature measuring system |
| CN204594584U (en) * | 2015-05-15 | 2015-08-26 | 中国长江电力股份有限公司 | A kind of generator temperature measurement on-line device |
Non-Patent Citations (1)
| Title |
|---|
| 冯经韬 等: "利用采保电容的三线制RTD测量模块设计", 《微计算机信息》 * |
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Application publication date: 20200616 |
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| RJ01 | Rejection of invention patent application after publication |