CN107024240A - The dynamic check method in steam turbine monitor protection instrument loop - Google Patents
The dynamic check method in steam turbine monitor protection instrument loop Download PDFInfo
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- CN107024240A CN107024240A CN201710191323.7A CN201710191323A CN107024240A CN 107024240 A CN107024240 A CN 107024240A CN 201710191323 A CN201710191323 A CN 201710191323A CN 107024240 A CN107024240 A CN 107024240A
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
The invention provides the dynamic check method in steam turbine monitor protection instrument loop, comprise the following steps：Vibrate the dynamic check of class measuring loop；The dynamic check of displacement class measuring loop；The dynamic check of rotating speed class measuring loop; the method of the present invention can ensure the validity and accuracy of verification; so that steam turbine monitor protection instrument indicates that correct and protection act is reliable; to ensure the safe operation of unit; and the output electric signal for using signal generator simulating sensor on the spot is inputted to the input of secondary meter; output characteristics to secondary meter is verified, and judges whether measurement indicated value, analog output value and the alarm of secondary meter, the working value of chaser are allowing within accuracy range.
Description
Technical field
The present invention relates to steam turbine monitor field, and in particular to the dynamic check side in steam turbine monitor protection instrument loop
Method.
Background technology
High speed development of the power industry Jing Guo last decade, Large Copacity, high parameter, bulk power grid, high voltage, high automatization level
The essential characteristic of present power industry is constituted, advanced monitoring protection technique increasingly becomes guarantee safety in production, realized now
The business administration of generationization, the indispensable condition for improving enterprise itself market competitiveness.Steam turbine monitor protection instrument（TSI）
By the development of decades, security, reliability have also obtained significant progress, devoting rate also more and more higher are protected, as guarantor
Demonstrate,prove the essential condition of unit safety operation.Therefore the inspection rate of TSI monitoring and protection devices types one as thermal technology's supervision is important interior
Hold.Therefore during each overhaul of unit, it is necessary to steam turbine monitor protection instrument（TSI）Verified, to ensure that TSI is monitored
Accurate and protection act it is reliable.
TSI systems are that have sensor, secondary meter and the cable institute group for connecting sensor and secondary meter on the spot on the spot
Into sensor measures the physical signallings such as vibration, displacement, rotating speed of steam turbine and physical signalling is converted into electric signal on the spot, leads to
Cross cable and be sent to secondary meter, secondary meter receives the electric signal of sensor on the spot, and to carry out signal transacting, be converted into
Corresponding measured value, while converting the measurement into 4-20mA signals teletransmission to DCS system is used for centralized displaying, or by logical
Communication interface is converted into digital quantity teletransmission is used for Centralized Monitoring to DCS, and secondary meter carries out monitoring protection to measured value, works as measured value
During higher than alarm, the setting value of chaser, secondary meter sends alarm, chaser signal and transmitted to follow-up ETS systems, to steam turbine
Alarmed or chaser processing, to protect steam turbine in a safe condition.
The content of the invention
In order to solve above-mentioned not enough defect, the invention provides the dynamic check side in steam turbine monitor protection instrument loop
Method, the loop dynamic method of calibration of steam turbine monitor protection instrument (TSI) of the invention, it is ensured that the validity and standard of verification
True property so that steam turbine monitor protection instrument indicates that correct and protection act is reliable, to ensure the safe operation of unit.
The invention provides the dynamic check method in steam turbine monitor protection instrument loop, comprise the following steps：
Vibrate the dynamic check of class measuring loop；
The dynamic check of displacement class measuring loop；
The dynamic check of rotating speed class measuring loop.
Above-mentioned method, wherein, the dynamic check of the vibration class measuring loop comprises the following steps：
The verification of axle Relative Vibration measuring loop；
Phase of the verification of the axle Relative Vibration measuring loop using non-contact electric eddy sensor measurement axle relative to bearing
To vibration.
Above-mentioned method, wherein, the verification of the axle Relative Vibration measuring loop uses non-contact electric eddy sensor
Measurement axle relative to bearing Relative Vibration the step of include：
There is provided one and vibrate checking table, an eddy current probe；
The eddy current probe is fixed on the target disc on the support of vibration checking table and just pair with actual tested surface same material；
By set the axle simulated of vibration parameters of the vibration checking table relative to bearing Relative Vibration measured value with
Indicated value simultaneously judges whether within the scope of allowable error.
Above-mentioned method, wherein, include the step of the dynamic check of the displacement class measuring loop：
The verification of axial displacement measuring loop；
The verification in swollen difference measurements loop.
Above-mentioned method, wherein, include the step of the verification of the axial displacement measuring loop：
One displacement generating device, a shaft position sensor are provided；
The displacement probe of the shaft position sensor is arranged on the support of the displacement generating device and according to the aobvious of DCS
Indicating value finds electrical null position；
The displacement of displacement generating device, record measured value and indicated value are adjusted based on above-mentioned electrical null position and judges whether allowing
Within the scope of error.
Above-mentioned method, wherein, include the step of the verification in the swollen difference measurements loop：
The dynamic check in compensation swollen difference measurements loop；
The dynamic check in ramp type is swollen difference measurements loop；
The step of dynamic check in the compensation swollen difference measurements loop, includes：
One displacement checking table, two swollen gap sensors are provided；
Described two swollen gap sensors are separately mounted to the both sides of the displacement checking table and mechanical zero is calibrated；
When being monitored target surface on displacement checking table and moving out the probe measurement scope of first swollen gap sensor, and then enter
Enter the probe monitors range of the twoth swollen gap sensor, record measured value and indicated value simultaneously judge whether scope in allowable error
Within；
The step of dynamic check in the ramp type swollen difference measurements loop, includes：
One displacement checking table, two swollen gap sensors are provided；
By the probe vertical of two swollen gap sensors be arranged on oblique angle be tested inclined-plane on, bevel angle from 0o to 45o,
And mechanical zero is calibrated before every measurement；
On the basis of mechanical zero, according to the change of displacement, the measurement indicated value of monitor is observed and recorded, is seen simultaneously
The indicated value of DCS system is examined and recorded, measurement error is calculated, and judge whether within the scope of allowable error.
Above-mentioned method, wherein, include the step of the dynamic check of the rotating speed class measuring loop：
One revolution speed check table, a speed probe are provided；
The speed probe is arranged on the speed measuring fluted disc of revolution speed check table and given different rotating speed；
The measurement indicated value of the monitor in the case of given different rotating speeds is recorded, while the indicated value of DCS system is observed and records,
Measurement error is calculated, and is judged whether within the scope of allowable error.
Above-mentioned method, wherein, error calculation formula is in checking procedure：
ΔE=[(Ms-Mg)/Mr]×100%
Wherein Δ E：Survey measurement error, Mg：Set-point, Ms：Measured value, Mr：Monitor range.
Above-mentioned method, wherein, it is described vibration class measuring loop dynamic check the step of in, by determine frequency multiple spot verify
Or/and the mode of fixed point multifrequency verification carrys out dynamic check vibration class measuring loop.
Above-mentioned method, wherein, the vibration checking table used in the step of vibrating the dynamic check of class measuring loop is
VVB-1 types vibrate checking table, the step of the dynamic check of displacement class measuring loop in the displacement generating device that uses be VZB-1
Type Portable shift checking table, the step of the dynamic check of rotating speed class measuring loop in the revolution speed check table that uses be VRB-1
The portable revolution speed check table of type, the toothed disc number of teeth can be while compatible 3 tooth, 10 teeth, 12 teeth, 20 teeth, 60 teeth, simulating the range of speeds be
1-10000rpm。
The present invention has advantages below：1st, the validity and accuracy of verification are ensured so that steam turbine monitor protection instrument
Indicate that correct and protection act is reliable, to ensure the safe operation of unit.2nd, sensor on the spot is simulated using signal generator
Output electric signal is inputted to the input of secondary meter, and the output characteristics to secondary meter is verified, and judges secondary meter
Measure indicated value, analog output value and alarm, whether the working value of chaser is allowing within accuracy range.3rd, using mould
Intend the change of unit simulation site physical amount, gather the output electric signal of sensor, school is carried out to transducer dwell output characteristics
Test, judge the range of linearity of sensor, sensitivity error whether within allowed band.
Brief description of the drawings
By reading the detailed description made with reference to the following drawings to non-limiting example, the present invention and its feature, outside
Shape and advantage will become more apparent upon.Identical mark indicates identical part in whole accompanying drawings.Not deliberately proportionally
Draw accompanying drawing, it is preferred that emphasis is the purport of the present invention is shown.
Fig. 1 is the mounting structure schematic diagram of the dynamic check of vibration class measuring loop in the present invention.
Fig. 2, Fig. 3, Fig. 4 a, Fig. 4 b are the mounting structure schematic diagram of the dynamic check of displacement class measuring loop in the present invention.
Fig. 5 is the mounting structure schematic diagram of the dynamic check of rotating speed class measuring loop in the present invention.
Fig. 5 a, Fig. 5 b are respectively to subtract each other type in the present invention and be added the swollen poor mounting means in type inclined-plane.
Fig. 6 is the mounting structure schematic diagram of the dynamic check of rotating speed class measuring loop in the present invention.
Embodiment
In the following description, a large amount of concrete details are given to provide more thorough understanding of the invention.So
And, it is obvious to the skilled person that the present invention can be able to without one or more of these details
Implement.In other examples, in order to avoid obscuring with the present invention, do not enter for some technical characteristics well known in the art
Row description.
In order to thoroughly understand the present invention, detailed step and detailed structure will be proposed in following description, so as to
Explain technical scheme.Presently preferred embodiments of the present invention is described in detail as follows, but in addition to these detailed descriptions, this
Invention can also have other embodiment.
In the present invention, first will illustratively, steam turbine monitor protection instrument（TSI）The composition of system：TSI systems are that have
The cable of sensor, secondary meter and connection sensor and secondary meter on the spot is constituted on the spot, and sensor measures vapour on the spot
Physical signalling is simultaneously converted into electric signal by the physical signallings such as vibration, displacement, the rotating speed of turbine, and secondary instrument is sent to by cable
Table, secondary meter receives the electric signal of sensor on the spot, and to carry out signal transacting, be converted into corresponding measured value, simultaneously
Converting the measurement into 4-20mA signals teletransmission to DCS system is used for centralized displaying, or is converted into numeral by communication interface
Measure teletransmission is used for Centralized Monitoring to DCS, and secondary meter carries out monitoring protection to measured value, when measured value is higher than alarm, chaser
During setting value, secondary meter sends alarm, chaser signal and transmitted to follow-up ETS systems, steam turbine is alarmed or chaser
Processing, to protect steam turbine in a safe condition.
And steam turbine monitor protection instrument（TSI）The verification of system：Because TSI systems are by sensor on the spot, secondary instrument
The transmission cable of table and connection sensor and secondary meter on the spot is constituted, therefore to steam turbine monitor protection instrument（TSI）
The verification of system, should include verifying the verification of Sensor's Static characteristic on the spot, secondary meter input-output characteristic, and whole time
The dynamic check on road.
Sensor's Static characteristic is verified on the spot：
The change of site physical amount is simulated using analogue means in the present invention, the output electric signal of sensor is gathered, to sensing
Whether device static output characteristic is verified, judge the range of linearity of sensor, sensitivity error within allowed band.
Secondary meter input-output characteristic is verified：
The output electric signal for simulating sensor on the spot using signal generator in the present invention is inputted to the input of secondary meter,
Output characteristics to secondary meter is verified, and judges the measurement indicated value, analog output value and alarm, jump of secondary meter
Whether the working value of machine is allowing within accuracy range.
Loop dynamic is verified：
Sensor is connected under conditions of secondary meter composition perfect measurement loop by transmission cable in the present invention, uses mould
Intend device, the physical quantity of TSI parameters is simulated at the scene, the indicated value of secondary meter is observed and record, while observing and recording remote
The measured value that DCS system is shown is reached, the characteristic to whole loop carries out dynamic check, judges the measurement indicated value in whole loop
It is whether correct and within the scope of allowable error with the working value of alarm, chaser.
Sensor on the spot has been only included in the technological supervision in heat power engineering of conventional each thermal power plant to the verification of vibration monitoring device
Static characteristic is verified and the input-output characteristic of secondary meter is verified.Static characteristic verification and secondary instrument due to sensor on the spot
The input-output characteristic verification of table belongs to monomer verification, and the transmission cable of spot sensor to secondary meter is not included,
Live dynamic operation condition is not simulated, can usually be occurred after monomer verification completion, measuring loop after unit puts into operation still occurred and go out
Now disturbance, measured value and operating experience value such as are not inconsistent at the phenomenon, and the dynamic check in loop compensate for the deficiency of monomer verification, direct mould
Intend operating condition so that being just exposed in checking stage the problem of be likely to occur in operation, be the unit maintenance stage i.e.
It can analyze and solve the problems, such as to have won the time.
Shown in reference picture 1- Fig. 6, the invention provides the dynamic check method in steam turbine monitor protection instrument loop, including
Following steps：
Step S1：The dynamic check of class measuring loop is vibrated, including following steps：
The verification of axle Relative Vibration measuring loop；The verification of its axis Relative Vibration measuring loop is passed using non-contact electric eddy
Sensor measures Relative Vibration of the axle relative to bearing, that is to say, that simulate phase of the turbine shaft relative to bearing by analogue means
To vibration, wherein measured value is the displacement peak-to-peak value of vibration, and unit is um P-P.
Specific verify includes providing a vibration checking table, an eddy current probe, is set wherein vibration checking table is Shanghai generating
The VVB-1 types intelligent portable vibration checking table of standby complete design and research institute's development and production, can arbitrarily set vibration shift value,
Speed virtual value and velocity peak values, and precision index is that ± 1%, i.e. allowable error are ± 1%, disclosure satisfy that vibration class measuring loop
Dynamic check use requirement, further eddy current probe is the eddy current probe of non-contact electric eddy sensor.
Eddy current probe is fixed on the target disc on the support of vibration checking table and just pair with actual tested surface same material, joined
According to shown in Fig. 1, pass through Relative Vibration measured value of the axle relative to bearing for setting the vibration parameters for vibrating checking table to be simulated
With indicated value and judging whether within the scope of allowable error, specific connected mode is：By eddy current probe and extension electricity
Cable and preamplifier connection, then preamplifier output end is connected with monitor, monitoring probe is finally fixed on verification
On platform, dynamic check is carried out to protection system.
Specifically include following two modes：
1st, determine the verification of frequency multiple spot, be specially to be arranged on standard vibration testing stand under the frequency of some fixation, adjust different
Vibration amplitude（Live set-point）, the measurement indicated value of monitor is observed and records, while observing and recording the instruction of DCS system
Value, calculates measurement error, and judge whether within the scope of allowable error.Vibration measurement is at the scene to fix eddy current probe
On vibration checking table, analog vibration amount signal directly carries out precision checking in monitor end record measured value, and concrete operations are
Plus voltage signal exports a vibration values, and add 5 different frequencies, this vibration values at different frequencies, analog signalses
It should not change, the sensitivity and linear measurement range of probe, the wherein range of linearity can be drawn with the verification that this carries out several points
Interior magnitude of voltage（VDC）It is one-to-one with vibration values (mm).
2nd, fixed point multifrequency verification, is specially the vibration amplitude that vibration mechine is arranged on to some fixation, and regulation is different
Vibration frequency（Given frequency）, the measured value of monitor is observed and records, while the indicated value of DCS system is observed and records,
Measurement error is calculated, and is judged whether within the scope of allowable error.
The error calculation formula of both the above mode is：
ΔE=[(Ms-Mg)/Mr]×100% …..(1)
Wherein Δ E：Survey measurement error, Mg：Given vibration values, Ms：Survey measured value, Mr：Monitor range.
As shown in table 1, under the conditions of for the verification by determining the verification of frequency multiple spot and fixed point multifrequency verification, class measuring loop is vibrated
The data of dynamic check.
Table 1
As can be drawn from Table 1, by the dynamic check of vibration class measuring loop of the invention, can intuitively it judge different
Under the conditions of verification, within the range of permission whether bearing horizontal axis vibration error.
Step S2：The dynamic check of displacement class measuring loop, including：The verification of axial displacement measuring loop；Swollen difference measurements
The verification in loop；
The verification of wherein axial displacement measuring loop includes：
A displacement generating device, a shaft position sensor are provided, shown in reference picture 2, wherein displacement generating device is sent out for Shanghai
The VZB-1 type Portable shift checking tables of the complete design and research institute's development and production of electric equipment, can arbitrarily set the position within 50mm
Shifting value and precision index is that ± 1%, i.e. allowable error are ± 1%, disclosure satisfy that displacement class measuring loop dynamic check use requirement,
And shaft position sensor is non-contact electric eddy sensor；
The displacement probe of shaft position sensor is arranged on the support of displacement generating device and found according to DCS show value
Electrical null position；The displacement of displacement generating device is adjusted based on above-mentioned electrical null position, record measured value and indicated value simultaneously judges whether
Within the scope of allowable error, specially axial displacement measuring loop verification requires displacement checking table being placed in a level
On platform, and fix in mounting bracket axial displacement probe（The displacement probe of non-contact electric eddy sensor）.Regulation
The location screw rod of spiral micrometer, electrical null position, record sensor output total null voltage are found according to DCS show value.At this
On the basis of zero-bit, different displacements are given, the measurement indicated value of monitor are observed and record, while observing and recording DCS
The indicated value of system.
Specific operating process is：Displacement probe is fixed to TK-3 current vortex sensor check meters at the scene, (this verification
The precision of instrument is ± 0.01mm) displacement variable is simulated at the scene, directly at monitor end, record measured value carries out precision school
Test.Concrete operations：Displacement probe is fixed to checking table, there is one block of steel plate in verification set front, can now read with micrometer
Probe and the distance of fixed plate, now distance is exactly displacement, and the value that this value is read with monitor is compared, now preceding
Magnitude of voltage can also be measured by putting device output end, and moving steel plate is to change displacement, the experiment of 5 points is done respectively, it can be deduced that pass
The range of linearity of sensor and sensitivity, current vortex sensor only can accurately just measure right value in linear scope.
Measurement error is calculated, and is judged whether within the scope of allowable error.
Error calculation formula is：
ΔE=[(Ms-Mg)/Mr]×100% …..(2)
Wherein Δ E：Survey measurement error
Mg：Given displacement
Ms：Measured displacements amount
Mr：Monitor range.
As shown in table 2, it is the data of axial displacement measuring loop verification.
In table 2, by giving different displacements, for example：-2.00mm、-1.50mm、-1.00mm、-0.50mm、
The measurement indicated value of the monitor obtained under conditions of 0.00mm, 0.50mm, 1.00mm, 1.50mm, 2.00mm, and judge whether
Within the scope of allowable error.And it is also provided with alarm setting value and actuation of an alarm value, that is to say, that reaching that the alarm sets
During definite value, warning reminding is sent, similarly, when reaching actuation of an alarm value, corresponding action is made.
Table 2
From table 2, it can be deduced that, by the verification of the axial displacement measuring loop of the present invention, it can intuitively judge main frame axial direction
Whether displacement is in the error range of permission.
Further, also include in the step of displacement class measuring loop：
The verification in swollen difference measurements loop, wherein including the dynamic check and the swollen difference measurements of ramp type in compensation swollen difference measurements loop again
The dynamic check in loop；
Further preferably, the step of dynamic check in compensation swollen difference measurements loop includes：
There is provided a displacement checking table, two swollen gap sensors shown in reference picture 3；
Described two swollen gap sensors are separately mounted to the both sides of displacement checking table and mechanical zero is calibrated；When displacement checking table
When upper monitored target surface moves out the probe measurement scope of first swollen gap sensor, the twoth swollen difference sensing is proceeded immediately to
The probe monitors range of device, records measured value and simultaneously judges whether with indicated value within the scope of allowable error, wherein displacement school
The VZB-1 type Portable shift checking tables that platform is Shanghai Power Equipment Research Institute's development and production are tested, can arbitrarily be set
Shift value and precision index within 50mm are that ± 1%, i.e. allowable error are ± 1%, disclosure satisfy that displacement class measuring loop dynamic
Use requirement is verified, swollen gap sensor is non-contact electric eddy sensor.Specially：Compensation swollen difference measurements loop verification will
Ask and displacement checking table is placed on a levelling bench, and two swollen differences are fixed in mounting bracket and pop one's head in.Adjust spiral
The location screw rod of micrometer, mechanical zero, record sensor output total null voltage are found according to DCS show value.In the zero-bit
On the basis of, different displacements are given, the measurement indicated value of monitor are observed and record, while observing and recording DCS system
Indicated value, calculate measurement error, and judge whether within the scope of allowable error.
Error calculation formula is：
ΔE=[(Ms-Mg)/Mr]×100% …..(3)
Wherein Δ E：Survey measurement error
Mg：Given displacement
Ms：Measured displacements amount
Mr：Monitor range
It is the data of compensation swollen difference measurements loop dynamic verification with reference to shown in table 3
Table 3
From table 3, it can be deduced that, by the verification in the compensation swollen difference measurements loop of the present invention, it can intuitively judge that main frame is mended
The swollen difference of formula is repaid whether in the error range of permission.
Further, the step of dynamic check in ramp type swollen difference measurements loop includes：
There is provided a displacement checking table, two swollen gap sensors shown in reference picture 4a, Fig. 4 b；
By the probe vertical of two swollen gap sensors be arranged on oblique angle be tested inclined-plane on, bevel angle from 0o to 45o,
And mechanical zero is calibrated before every measurement；On the basis of mechanical zero, according to the change of displacement, observation
And the measurement indicated value of monitor is recorded, while observing and recording the indicated value of DCS system, measurement error is calculated, and judgement is
It is no within the scope of allowable error, specially two non-contact electric eddy probe verticals are arranged on oblique by the swollen difference measurements of ramp type
On the tested inclined-plane that angle is, bevel angle is from 0o to 45o, and monitor inside process circuit is obtained after input quantity, calculates oblique
The correction factor in face, the real swollen residual quantity of display.It can be divided into and subtract each other type and be added the swollen difference in type inclined-plane, mounting means reference picture 5a,
Shown in Fig. 5 b, when carrying out the verification of ramp type swollen difference measurements loop dynamic, due to can not accurate simulation be tested the oblique angle on inclined-plane,
In actual checking procedure, loop dynamic verification, specific mounting means reference picture 4a can be carried out using compensation mounting means
With shown in Fig. 4 b.The wherein swollen poor calculation formula in inclined-plane is：
D=d/sinӨ……(4)
Wherein D be the swollen difference measurements shift value in inclined-plane, d be it is compensation install it is actual to displacement values, be inclined-plane oblique angle；
Ramp type is swollen, and the verification of difference measurements loop requires displacement checking table being placed on a levelling bench, and in mounting bracket
Fix two swollen gap sensors.The location screw rod of spiral micrometer is adjusted, mechanical zero is found according to DCS show value, is remembered
Record sensor output total null voltage.On the basis of the zero-bit, according to derivation formula（4）Given different displacement d, observation is simultaneously
The measurement indicated value of monitor is recorded, while observing and recording the indicated value of DCS system, measurement error is calculated, and judge whether
Within the scope of allowable error.
Error calculation formula is：
ΔE=[(Ms-d/sinӨ)/Mr]×100% .(5)
Wherein Δ E：Survey measurement error
Ms:Measured displacements amount
Mr：Monitor range
It is the swollen poor loop dynamic verification data in inclined-plane with reference to shown in table 4；
Table 4
From table 4, it can be deduced that, by the verification in the swollen difference measurements loop in inclined-plane of the present invention, it can intuitively judge main frame inclined-plane
Whether swollen difference is in the error range of permission.
Step S3：The dynamic check of rotating speed class measuring loop, specifically includes following steps：
There is provided a revolution speed check table, a speed probe shown in reference picture 6, wherein revolution speed check table be Shanghai generating equipment into
The portable revolution speed check table of VRB-1 types of Analysis of Nested Design research institute development and production, the toothed disc number of teeth can be while compatible 3 tooth, 10 teeth, 12
Tooth, 20 teeth, 60 teeth, the simulation range of speeds are 1-10000rpm, can setting speed value and precision index be arbitrarily ± 0.1rpm, energy
Rotating speed class measuring loop dynamic check use requirement is enough met, and speed probe is non-contact electric eddy sensor；Its
Middle tachometric survey includes the fast measuring loop of zero-turn and tachometric survey loop.The wherein fast measuring loop of zero-turn uses contactless electric whirlpool
Flow sensor carries out tachometric survey, often using cycle test method, is accurately measured for low speed, measurement is continuous two signal pulses
Gap periods；Non-contact electric eddy sensor or reluctive transducer can be used to carry out tachometric survey for tachometric survey loop,
Measuring Frequency Method is often used, for accurate measurement at a high speed, measurement is the signal pulse number detected in fixed time period.Turn
Speed general measure unit be：RPM.
The speed probe is arranged on the speed measuring fluted disc of revolution speed check table and given different rotating speed；
The measurement indicated value of the monitor in the case of given different rotating speeds is recorded, while the indicated value of DCS system is observed and records,
Measurement error is calculated, and is judged whether within the scope of allowable error, specially tachometric survey loop verification is required in rotating speed school
Test that one or more tachogenerators are fixed on platform speed measuring fluted disc is as shown in Figure 6.Given different rotating speed（Live set-point）,
The measurement indicated value of monitor is observed and recorded, while observing and recording the indicated value of DCS system, measurement error is calculated, and sentence
Break whether within the scope of allowable error.Operating process is：Tachometric survey is that revolution probe is fixed into special turn of TSI at the scene
Fast experimental bench（Model VRB-1, precision ± 1 turn）Analog-to directly carries out precision checking in monitor end record measured value,
This revolution checking table can taking human as it is direct plus, turn reducing speed, i.e., Jia 500 respectively, 1000,1500,2000,2500,3000,
Rotating speed measured value is directly read at rotational speed monitor end, is directly compared, can be calculated error.
It is as follows than derivation formula including rotating speed tooth：
Sm=Sg×(Pg/Pm) ×100%……(6)
Wherein Sm：Survey tachometer value, Sg：Given rotating speed value, Pg：The tester rotating speed number of teeth, Pm：Number of gear teeth on the spot
Error calculation formula is：
ΔE=[(Ms-Mg)/Mr]×100% …..(7)
Wherein Δ E：Survey measurement error
Mg：Given rotating speed value
Ms：Survey tachometer value
Mr：Monitor range
It is tachometric survey loop dynamic verification data as shown in table 5；
Table 5
From table 5, it can be deduced that, by the verification in the tachometric survey loop of the present invention, it can intuitively judge that turbine speed is
It is no in the error range of permission.
The present invention one is preferably and in non-limiting embodiment, in addition to error analysis and qualified criterion, according to
The requirement of the API670 standards third edition, the sensitivity error of TSI sensors is ± 10%, and vibration monitor measured value allowable error is
±1%；Analog output allowable error is ± 1%；Working value output allowable error is ± 1%, the measurement of vibration monitor loop dynamic
It is ± 10% to be worth error.The VVB-1 type portable vibration testing stand precision indexs of Shanghai Power Equipment Research Institute's production
It is ± 1% for ± 1%, i.e. allowable error, Shanghai Power Equipment Research Institute's production VZB-1 displacement tester precision indexs
It is ± 0.5% for ± 0.5%, i.e. allowable error, Shanghai Power Equipment Research Institute's production VRB-1 rotating speed tester precision
Index is ± 0.1rpm, meets the precision needs of reference instrument used in verification higher than verified sensor, monitor
The requirement of precision.Therefore class measuring loop dynamic check, displacement class measuring loop dynamic check, rotating speed class are vibrated in the present invention
The error requirements of error and the API670 standard third editions in measuring loop dynamic check are contrasted, and judge verified measurement
Whether loop is qualified, and underproof equipment is replaced.
Presently preferred embodiments of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, wherein the equipment and structure be not described in detail to the greatest extent are construed as giving reality with the common mode in this area
Apply；Any those skilled in the art, without departing from the scope of the technical proposal of the invention, all using the disclosure above
Methods and techniques content make many possible variations and modification to technical solution of the present invention, or be revised as equivalent variations etc.
Embodiment is imitated, this has no effect on the substantive content of the present invention.Therefore, every content without departing from technical solution of the present invention, foundation
The technical spirit of the present invention still falls within the present invention to any simple modifications, equivalents, and modifications made for any of the above embodiments
In the range of technical scheme protection.
Claims (10)
1. the dynamic check method in steam turbine monitor protection instrument loop, it is characterised in that comprise the following steps：
Vibrate the dynamic check of class measuring loop；
The dynamic check of displacement class measuring loop；
The dynamic check of rotating speed class measuring loop.
2. the dynamic check method in steam turbine monitor protection instrument loop as claimed in claim 1, it is characterised in that described to shake
The dynamic check of dynamic class measuring loop comprises the following steps：
The verification of axle Relative Vibration measuring loop；
Phase of the verification of the axle Relative Vibration measuring loop using non-contact electric eddy sensor measurement axle relative to bearing
To vibration.
3. the dynamic check method in steam turbine monitor protection instrument loop as claimed in claim 2, it is characterised in that the axle
Step of the verification of Relative Vibration measuring loop using non-contact electric eddy sensor measurement axle relative to the Relative Vibration of bearing
Suddenly include：
There is provided one and vibrate checking table, an eddy current probe；
The eddy current probe is fixed on the target disc on the support of vibration checking table and just pair with actual tested surface same material；
By set the axle simulated of vibration parameters of the vibration checking table relative to bearing Relative Vibration measured value with
Indicated value simultaneously judges whether within the scope of allowable error.
4. the dynamic check method in steam turbine monitor protection instrument loop as claimed in claim 1, it is characterised in that institute's rheme
The step of dynamic check for moving class measuring loop, includes：
The verification of axial displacement measuring loop；
The verification in swollen difference measurements loop.
5. the dynamic check method in steam turbine monitor protection instrument loop as claimed in claim 4, it is characterised in that the axle
To displacement measurement loop verification the step of include：
One displacement generating device, a shaft position sensor are provided；
The displacement probe of the shaft position sensor is arranged on the support of the displacement generating device and according to the aobvious of DCS
Indicating value finds electrical null position；
The displacement of displacement generating device, record measured value and indicated value are adjusted based on above-mentioned electrical null position and judges whether allowing
Within the scope of error.
6. the dynamic check method in steam turbine monitor protection instrument loop as claimed in claim 4, it is characterised in that described swollen
The step of verification in difference measurements loop, includes：
The dynamic check in compensation swollen difference measurements loop；
The dynamic check in ramp type is swollen difference measurements loop；
The step of dynamic check in the compensation swollen difference measurements loop, includes：
One displacement checking table, two swollen gap sensors are provided；
Described two swollen gap sensors are separately mounted to the both sides of the displacement checking table and mechanical zero is calibrated；
When being monitored target surface on displacement checking table and moving out the probe measurement scope of first swollen gap sensor, and then enter
Enter the probe monitors range of the twoth swollen gap sensor, record measured value and indicated value simultaneously judge whether scope in allowable error
Within；
The step of dynamic check in the ramp type swollen difference measurements loop, includes：
One displacement checking table, two swollen gap sensors are provided；
By the probe vertical of two swollen gap sensors be arranged on oblique angle be tested inclined-plane on, bevel angle from 0o to 45o,
And mechanical zero is calibrated before every measurement；
On the basis of mechanical zero, according to the change of displacement, the measurement indicated value of monitor is observed and recorded, is seen simultaneously
The indicated value of DCS system is examined and recorded, measurement error is calculated, and judge whether within the scope of allowable error.
7. the dynamic check method in steam turbine monitor protection instrument loop as claimed in claim 1, it is characterised in that described turn
The step of dynamic check of fast class measuring loop, includes：
One revolution speed check table, a speed probe are provided；
The speed probe is arranged on the speed measuring fluted disc of revolution speed check table and given different rotating speed；
The measurement indicated value of the monitor in the case of given different rotating speeds is recorded, while the indicated value of DCS system is observed and records,
Measurement error is calculated, and is judged whether within the scope of allowable error.
8. the dynamic check method in the steam turbine monitor protection instrument loop as described in claim any one of 1-7, its feature exists
In error calculation formula is in checking procedure：
Δ E=[(Ms-Mg)/Mr] × 100%, wherein Δ E：Survey measurement error, Mg：Set-point, Ms：Measured value, Mr：Prison
Visual organ range.
9. the dynamic check method in steam turbine monitor protection instrument loop as claimed in claim 8, it is characterised in that described to shake
In the step of dynamic check of dynamic class measuring loop, come dynamic by way of determining the verification of frequency multiple spot or/and fixed point multifrequency verification
Verification vibration class measuring loop.
10. the dynamic check method in steam turbine monitor protection instrument loop as claimed in claim 8, it is characterised in that shaking
The vibration checking table used in the step of dynamic check of dynamic class measuring loop vibrates checking table for VVB-1 types, is surveyed in displacement class
The displacement generating device used in the step of measuring the dynamic check in loop is VZB-1 type Portable shift checking tables, in rotating speed class
The revolution speed check table used in the step of dynamic check of measuring loop is the portable revolution speed check table of VRB-1 types, toothed disc tooth
Number can be while compatible 3 tooth, 10 teeth, 12 teeth, 20 teeth, 60 teeth, the simulation range of speeds be 1-10000rpm.
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