About the hydropower industry
Hydropower is a clean energy source, renewable, pollution-free, and conducive to improving the utilization rate of resources. Under the situation that the earth's traditional energy is increasingly tight, the development of hydropower has developed rapidly.
China is among the best in the world in terms of hydropower reserves and exploitable hydropower resources. With the completion of well-known hydropower projects such as Three Gorges, Baihetan and Xiluodu, the design, construction and equipment manufacturing of hydropower stations have also reached the international leading level, and China has become one of the technology exporters in the hydropower industry.
The rapid development and continuous growth of the industry inevitably have higher requirements for the standards of manufacturing, installation, commissioning, etc. of hydropower projects, so the measurement and testing work in these processes needs to be more rigorous and efficient.
Picture: Water and electricity maintenance site
Measurement demand and difficulties of the hydropower industry
1. Typical demand
The roundness of the rotor needs to be measured during installation or expanded maintenance of the turbine generator set. Generally, the tolerance requirement of the outer diameter of the rotor of the large turbine generator is generally about 1mm to ensure roundness and coaxiality, thus ensuring the uniformity with the stator gap, and the consistency of the height of the magnetic pole center and the height of the stator center.
During the operation of the rotor of the large turbine generator, the gap between the rotor and the stator is very small, generally only 8 to 40mm, and the generator spindle should drive the rotor, the water turbine spindle, the rotor, etc. to rotate together at a speed of hundreds to thousands of rpm (the overall rotation weight of the general unit is more than 10 tons). If the rotor If the outer roundness does not meet the requirements, the gap with the stator will be uneven, which will cause great vibration during the rotation of the unit, affecting the power generation of the unit. If the height of the magnetic pole center is inconsistent with the height of the stator center, it will also affect the power generation of the unit; therefore, it is very important to control the roundness, coaxiality and center height error of the outer circle of the rotor within the ideal range.
2. Other measurement requirements
- Test parameters such as cylinderity and diameter size of the rotor
- Detect parameters such as cylinderity and diameter size of the stator
- Detect the coaxiality of related parts and guide the installation and adjustment
- Test the roundness and cylindricity and other related dimensions of the workpiece
- Other high-precision measurement and adjustment guidance involving geometric or spatial positions on the production line
Traditional measurement methods and problems
Traditional measuring instruments and tools, such as measuring round frame, level meter, centring instrument, inner diameter or outer diameter micrometer, percentage meter, vernier caliper, etc., need to use a variety of instruments or tools to obtain the measurement results, and then gradually calculate to obtain the measurement results, which introduces a large number of cumulative errors, which leads to measurement accuracy and reliability. Sexual reduction.
For example: the traditional rotor circle measuring device is relatively cumbersome in adjusting the concentricity with the rotor. It needs to set up a centrimeter and repeatedly measure and proofread it with the piano line. After finding the center of the rotor center, the circle measuring device and the rotor center can be adjusted, which is time-consuming and and eforious; and when encountering the rotor benchmark, the rotor center ring When the surface is used as a benchmark, the traditional circle measuring device cannot be used.
Figure: API brand series laser tracker (from left to right model: Radian Plus / Radian Pro / Radian Core / iLT)
Measurement characteristics of Radian laser tracker
API's Radian laser tracker is a high-precision 3/6D measuring instrument with a large measurement range, which is very suitable for measurement and testing operations in all aspects of hydropower projects.
Just set up the Radian laser tracker next to the standard to be measured to start the operation and measurement; when measuring, set the Radian laser tracker in the system coordinate system, and the emitted laser will track the SMR (tracker target) in the operator's hand. The operator only needs to hold the target and touch the data to be collected. For the part to be tested, the tracker will automatically collect the three-dimensional measurement data of the counting point, send it to the laptop and record it in the measurement software for subsequent processing and analysis.
After the data information of all the parts to be tested is collected, the operator can set, analyze and compare these data with the nominal value in the measurement software, so as to obtain the error of the actual value and achieve the effect of detection.
Radian laser tracker has micron (μm) accuracy, a measurement radius of more than 80 meters, and a super-large measurement angle range. It is compact and compact in design. It can be installed in any posture and can fully meet the requirements of measurement accuracy, efficiency, range, etc. in all aspects of the hydropower project; Among them, Radian Plus and Radian Core models also adopt battery-powered and wireless communication systems, which can completely get rid of the shackles and troubles of various cables, making the whole measurement process easier to control.
Performance characteristics of iLT laser tracker
The newly launched iLT laser tracker further reduces the overall size of the laser tracker by 50% (compared with the Radian series) on the basis of fully wireless measurement. The weight of the whole machine is only 4.9Kg, giving full play to the portable properties, fully satisfying and suitable for going out, outdoor, Application environments such as narrow space and multi-machine integration.
API laser tracker hydropower industry measurement example
1. Stator cylinder & diameter
2. Detection of the upper axis of the generator: measure the cylinder, analyze the deformation through the cross-section circle, measure the coaxiality of the upper and lower cylinders, and see the deviation.
Live sharing of other hydropower testing sites
Sum up
Based on the working characteristics of API brand Radian / iLT laser tracker with high precision, large range, large angle, flexible and portable, easy to operate, etc., it can provide high-quality precision measurement solutions for manufacturing, installation, commissioning, maintenance and other links in hydropower projects, and can fully meet the hydropower industry's High standard requirements for measurement accuracy and convenience.