CN112033525A - Current vortex vibration measurement sensor signal static simulation test method - Google Patents
Current vortex vibration measurement sensor signal static simulation test method Download PDFInfo
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- CN112033525A CN112033525A CN202010842575.3A CN202010842575A CN112033525A CN 112033525 A CN112033525 A CN 112033525A CN 202010842575 A CN202010842575 A CN 202010842575A CN 112033525 A CN112033525 A CN 112033525A
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- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/02—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by magnetic means, e.g. reluctance
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Abstract
The invention relates to a static simulation test method, in particular to a static simulation test method for signals of an eddy current vibration measurement sensor. The method belongs to the technical field of vibration monitoring and protection control systems, and realizes full-function steam turbine shaft vibration dynamic and static simulation test. According to the test method, the eddy current sensor, the extension cable, the pre-positioning device and the TSI device are connected in series with the ultra-stable portable tester to the vibration signal loop, and the output of the tester is adjusted to change the output of the eddy current sensor, so that the static simulation test of the vibration signal of the turbine bearing is realized.
Description
Technical Field
The invention relates to a static simulation test method, in particular to a signal static simulation test method for an eddy current vibration measurement sensor, belongs to the technical field of vibration monitoring and protection control systems, and realizes full-function steam turbine shaft vibration dynamic and static simulation test.
Background
When the power generation steam turbine unit operates safely, the variable quantity of the shaft vibration of the steam turbine is an important monitoring and protecting signal, and the operation safety and the fault detection of the power generation unit are concerned. At present, an eddy current sensor is generally adopted for monitoring the shaft vibration of the steam turbine, the accuracy and the reliability of the shaft vibration signal of the steam turbine are extremely important in the starting and the operation of a unit and are also inseparable from the fault analysis of the steam turbine, and the vibration sensor and the vibration detection device need to be comprehensively tested during the debugging or the overhauling period so as to ensure the accuracy and the reliability of the vibration signal.
Disclosure of Invention
The invention mainly solves the defects in the prior art, and provides the signal static simulation test method for the eddy current vibration test sensor, which can realize the static simulation test of the vibration signal while ensuring the integrity of the vibration signal loop and can effectively check and eliminate the signal loop fault in time at the test stage.
The technical problem of the invention is mainly solved by the following technical scheme:
a static simulation test method for signals of an eddy current vibration measurement sensor is carried out according to the following steps:
the vibration signal measurement adopts an eddy current sensor, the tester is connected in series to a vibration signal loop, the output of the tester is adjusted to change the output of the eddy current sensor, a high-frequency alternating current is provided for a probe coil through a front-end device, the signal is output to a TSI device, when the relative distance between the probe and the bearing surface of the steam turbine is within a certain range, the bearing surface of the steam turbine can form an eddy current magnetic field to influence the impedance of an original coil, under the condition that the resistivity, the magnetic conductivity and the frequency of coil exciting current are not changed, the output of the sensor is in a linear relation with the relative distance between the probe and the bearing surface, the vibration signal is output to a monitoring device after being judged and processed in the TSI device through adjusting the eddy current sensor, and static simulation test can be carried out on the vibration.
Preferably, the vibration signal analog quantity can be obtained through theoretical calculation, so that the actual controllability and adjustability of the signal analog quantity are realized;
hypothesis testing instrument should be addedThe peak voltage of is us (V), and the alarm value of the shaft vibration is s1(mum) trip protection action value of s2(mum), the sensitivity of the current vortex sensor is (mV/mum), and then the peak voltage required by the tester during the alarming and protecting actions can be respectively obtained according to the following formula;
the peak voltage output of the tester is directly proportional to the vibration measurement.
TSI is known throughout as Turbine Supervisory Instruments.
The requirement on testing equipment is low, the testing can be realized by conventional debugging equipment, the special stable portable tester with the model number of GY822 is adopted in the specification, and other debugging equipment such as FLUKE743B/744 can also be realized.
Take a constant frequency amplitude modulation type eddy current displacement vibration sensor as an example.
According to the eddy current sensor circuit model, kirchhoff's law can be used to obtain:
is provided with a U1＝AeptThen, a characteristic equation is obtained:
L1Cp2+R1Cp+1＝0 (2)
the characteristic root is as follows:
this gives:
in summary, p is1、p2Determined by circuit parameters, A1、A2Determined by the initial conditions of the circuit. When t is assumed to be 0, U1U and zero current in the loop, we get:
since the whole working circuit is an oscillating circuit close to resonance when the sensor is in working state, p1、p2Is a pair of complex conjugates. If defined:
the following can be found:
in the formula
As shown in formula (8), U1Is a damped oscillation. The attenuation of the oscillation amplitude is related to the material of the tested body, the bearing metal material of the steam turbine is steel, and the attenuation coefficient of the steel material to the oscillator is verified to be 1 through data verification, so that the output of the sensor is actually an oscillation, and when the relative distance changes, the inductance L of the eddy current changes along with the oscillation, so that the output voltage of the oscillator changes. In the dynamic and static debugging stage of the shaft vibration of the steam turbine, the tester is connected in series with the vibration signal loop, an adjustable oscillation is calculated and simulated according to the sensitivity of the eddy current sensor to act on the output oscillation of the primary coil, and the static simulation test of the vibration signal can be realized while the completeness of the vibration signal loop is ensured.
The invention can achieve the following effects:
the invention carries out static simulation test on the shaft vibration of the steam turbine by using the ultra-stable portable tester, the signal loop test can check and eliminate the loop fault in time, the requirement of the test equipment is low, the signal simulation set value can be obtained by theoretical calculation, and simultaneously, the invention can test whether the setting of the vibration alarm protection parameter in the TSI device and the analog quantity output are correct or not, and can completely meet the requirement of the static simulation test.
Drawings
FIG. 1 is a structural diagram of a vibration measuring system of an eddy current sensor according to the present invention;
FIG. 2 is a schematic diagram of an eddy current sensor in accordance with the present invention;
FIG. 3 is a schematic diagram of a vibratory static simulation test loop of the present invention;
FIG. 4 is a schematic diagram of an equivalent detection circuit of the constant frequency amplitude modulation eddy current sensor according to the present invention.
In FIG. 4, note: u shape0-an excitation signal voltage; r0-a voltage dividing resistor; u shape1-detecting the circuit output voltage; c-parallel resonance capacitance; r1-sensor coil equivalent resistance; l is1-sensor coil equivalent inductance; i is1-detecting the coil current; r2-measured body equivalent resistance; i is2-measured body equivalent current.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example 1: as shown in the figure, the steam turbine adopts a Bentley 3500 safety monitoring system, the eddy current sensor system adopts a 3300XL8mm system, the sensitivity of a front-end device is 7.87 mV/mum, the composition of the vibration monitoring system is shown in figure 1, and the measurement principle is shown in figure 2. The shaft vibration signal static simulation test needs to be carried out individually and respectively, and by taking the steam turbine # 1 shaft vibration as an example, before the static test is started, the signal loop wiring and the signal shielding are checked, the installation gap voltage of the probe is ensured to meet the technical requirements of manufacturers, and the real-time online value of the steam turbine # 1 shaft vibration is read through a debugging computer and a TSI device communication interface. Connecting the test tester to the signal loop in seriesThe schematic diagram of the test loop is shown in fig. 3, and the wiring is ensured to be firm and reliable. And (3) adjusting the function gear of the tester to frequency output, setting the frequency to be 50Hz, adjusting the frequency, setting the initial peak value to be 0V, and enabling the vibration value read by the computer to be consistent with that before the tester is not connected in series. Suppose that the peak voltage applied by the tester is us (V) and the alarm value of the steam turbine # 1 shaft vibration is s1(mum) trip protection action value of s2(mum), the peak voltage needed by the tester during alarm and protection can be obtained according to the following formula, the peak voltage of the tester is set to the calculated value, the vibration read value of the computer is corresponding to the alarm value and the protection value, the analog output is consistent with the read value, and the alarm and trip protection output relay output is checked to operate correctly.
In the embodiment, static test is carried out on the #1 shaft vibration of the steam turbine safety monitoring system of the Teli 3500, and a stable portable tester is adopted to set a peak value variable oscillation according to the eddy current principle so as to simulate the condition of output voltage change when the coil impedance of the eddy current sensor changes due to the distance between the coil impedance and the measured surface. The testing device can check and eliminate the circuit fault while testing the signal loop, the requirement of the testing device is low, the signal simulation set value can be obtained by theoretical calculation, and meanwhile, the setting of the vibration alarm protection parameter in the TSI device and the correctness of the analog quantity output can also be tested, and the requirement of static simulation testing can be completely met.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the implementation is not limited to the above-described embodiments, and those skilled in the art can make various changes or modifications within the scope of the appended claims.
Claims (2)
1. A static simulation test method for signals of an eddy current vibration measurement sensor is characterized by comprising the following steps:
the vibration signal measurement adopts an eddy current sensor, the tester is connected in series to a vibration signal loop, the output of the tester is adjusted to change the output of the eddy current sensor, a high-frequency alternating current is provided for a probe coil through a front-end device, the signal is output to a TSI device, when the relative distance between the probe and the bearing surface of the steam turbine is within a certain range, the bearing surface of the steam turbine can form an eddy current magnetic field to influence the impedance of an original coil, under the condition that the resistivity, the magnetic conductivity and the frequency of coil exciting current are not changed, the output of the sensor is in a linear relation with the relative distance between the probe and the bearing surface, the vibration signal is output to a monitoring device after being judged and processed in the TSI device through adjusting the eddy current sensor, and static simulation test can be carried out on the vibration.
2. The method for static simulation test of signals of an eddy current vibration measuring sensor according to claim 1, wherein: the vibration signal analog quantity can be obtained through theoretical calculation, so that the actual controllable and adjustable signal analog quantity is realized;
suppose that the peak voltage applied by the tester is us (V) and the alarm value of the shaft vibration is s1(mum) trip protection action value of s2(mum), the sensitivity of the current vortex sensor is (mV/mum), and then the peak voltage required by the tester during the alarming and protecting actions can be respectively obtained according to the following formula;
the peak voltage output of the tester is directly proportional to the vibration measurement.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140239732A1 (en) * | 2012-10-11 | 2014-08-28 | Powermat Technologies, Ltd. | Inductive power transmission system and method for concurrently transmitting digital messages |
| CN205898289U (en) * | 2016-08-15 | 2017-01-18 | 中国大唐集团科学技术研究院有限公司华东分公司 | Simulation steam turbine TSI system vibration detection device |
| CN106969828A (en) * | 2017-04-18 | 2017-07-21 | 中广核工程有限公司 | A kind of steam turbine watt vibration sensor fault diagnosis and passage check system and method |
| CN107014479A (en) * | 2017-03-28 | 2017-08-04 | 大唐彬长发电有限责任公司 | Steam turbine monitor protection instrument vibrates the dynamic check method of class measuring loop |
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- 2020-08-20 CN CN202010842575.3A patent/CN112033525A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140239732A1 (en) * | 2012-10-11 | 2014-08-28 | Powermat Technologies, Ltd. | Inductive power transmission system and method for concurrently transmitting digital messages |
| CN205898289U (en) * | 2016-08-15 | 2017-01-18 | 中国大唐集团科学技术研究院有限公司华东分公司 | Simulation steam turbine TSI system vibration detection device |
| CN107014479A (en) * | 2017-03-28 | 2017-08-04 | 大唐彬长发电有限责任公司 | Steam turbine monitor protection instrument vibrates the dynamic check method of class measuring loop |
| CN106969828A (en) * | 2017-04-18 | 2017-07-21 | 中广核工程有限公司 | A kind of steam turbine watt vibration sensor fault diagnosis and passage check system and method |
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