Development of Integrated On-line Monitoring System for Turbogenerator
Automatically record the hydrogen humidity and temperature of each electric quantity stator negative sequence current generator of each temperature generator of each part of the generator every hour, and can print out every 241 through the printer! Measured Rotor Winding Waveforms Every measurement and recording of the secondary insulation monitor's ion current value can be used to query the generator's temperature in hours. Hydrogen humidity and all electrical variables. Daily Change in Ion Current Percent of Insulation Overheat Monitor Curve and rotor winding motion waveforms. Take any five temperature measurement points as a group and query the temperature variation curve of all temperature measurement points by month. All values ​​and curves can be printed at any time.
The no-load characteristic curve and the short-circuit characteristic curve of the generator can be measured and the test data can be automatically listed and drawn into a curve, and the curve can be observed and recorded at any time by recording and arranging the data for an optical aperture. Waveform, and measure the time and amplitude of any point on the waveform through the cursor.
2 The connection of each input signal The signal of this system is input through two kinds of ways, it is through the data acquisition in the expanded city slot to input in the way of conversion, it is through the serial port of the industrial computer to input the signal by the communication source. , 1 from the sensor conversion from the output of other monitoring equipment, 2.1, the amount of temperature The temperature of the system is sent by the generator's three temperature inspection instrument serial port to three patrol instrument The output signal line is first connected in parallel and then connected to the serial port of the IPC through the root cable. 22 Electrical quantities The amount of electrical power that the system accesses has the generator phase stator current phase stator voltage rotor current rotor voltage various power access methods + kind.
Because on-line monitoring, the instrument is working with the main equipment for a long time, in order to prevent the instrument from malfunctioning, it may cause the current transformer to open on the secondary side and does not string the device into the current loop. Instead, it uses three precision levels of 0.1. The micro-passage 1 is worn on the secondary loop of the current transformer of the inverter, and the secondary current is converted into the AC that can be used by the computer data acquisition card. Since there is no direct electrical connection, the safety of the secondary device will not be affected. The stator voltage measurement also uses the 01-level high-precision miniature, through the terminal block and directly in the generator voltage transformer sub-peace for safety, the dragon used a terminal with a line of insurance with a wide row of rotor current and voltage measurement signals are taken from The transmitter of the original measuring moon is called the road transmitter output. 20. Considering the original resistance of the loop and the load capacity of the transmitter, a 200 in series is entered in the loop. The rotor voltage and current signals are respectively connected to two different acquisition blocks. The two transmitters are originally connected to the same computer. To avoid interference between the control and the computer, two acquisition cards are connected to the industrial control computer. Bus isolation is taken.
2.3 Hydrogen content The amount of hydrogen in this system is a signal from a generator. Hydrogen humidity transmitters are manufactured by Finns 13 into the company, model 1260. The instrument is installed on the hydrogen circuit of the generator zero meter layer. The instrument passes the humidity sensor and is warmed. Sensor measurement, gas relative humidity and ugly temperature 7. The instrument has two kinds of output methods, the type is 3484422 to connect the output; the other kind is double-pass é€ analog output This system uses the analog output method, through the pick industrial computer The number of halls entering the hall is now 1 min. The bus is also taken from the bus. The distance from the hydrogen and service monitors is far from the control room to reduce interference. Two twisted pair shields are used. 2.4 Insulation Overheating Monitor Signal Input Insulation Overheating Monitor is divided into Detector and remote controller 2 parts, remote controller installed in the control room next to the detector, detector mounted on the bottom of the generator 6 on the detector ion current is amplified to mA level current is adjusted to 10, or so, when there is When the overheat fault occurs and the current drops below 73, the remote controller will automatically judge the alarm. In order to measure the current size, a 50 Ω resistor is connected to the current loop of the instrument, and the ion current is 10 Ω. The voltage is 1 to avoid mutual interference when the industrial computer hooks the overheat monitor and the bus optoelectronic isolation 2.5 rotor is used. The signal input rotor winding inter-turn short circuit detection times is taken directly from the fixed household air gap with 32 slot harmonics. In order to truly reflect the shape of the rotor winding magnetic flux leakage field, a data acquisition card with a higher sampling speed is selected.
The multi-block acquisition cards used in this system are all 12-bit, but the acquisition speed is not the same as the AC power acquisition synchronization acquisition card. The acquisition speed is a one-frequency sampling requirement, and the isolation is based on optical isolation. In terms of form, the establishment of its signal is slow, but this can also meet the requirements because of the turbulence of the goods.
3 Setting of each function of the system 3.1 Temperature The temperature of the system is currently recorded and printed every hour. This is based on the requirements of the former Hubei Provincial Electric Power Bureau's generator anti-accident measures. 3.2 The amount of electricity in the system is also Recorded once per hour, this is mainly to print with the temperature of the record, only at the temperature and grid active power at the time of printing, it is easy to directly compare the temperature of the plant in different conditions 3.3 Temperature difference alarm when a measuring point temperature is higher than If the specified value is higher than or equal to the average value of all similar temperature points, the system will be set as an alarm. The factory temperature measuring element is installed in different parts. Even if the temperature measurement point of the same type is different due to different heat dissipation conditions, the temperature will be different. When the temperature difference reaches 8 1 or more, it is an abnormal phenomenon.
3.4 Rotor inter-turn short circuit detection signal The waveform is set to every 2 times since the test record 1 because the rotor winding voltage is not high, the turn-to-turn insulation damage and development speed is relatively low, will not breakdown, so 24 records once Can meet the requirements of no set timing printing, can be adjusted at any time when necessary to print.
3.5 Ionic Current System of Insulation Overheating Monitor Every 1 test and record one off production current. This takes into account that the overheat monitor may falsely alarm, and the operating personnel need enough information for reference, then the ion current in the near hours Changing trends are very important information.
3.6 Hydrogen temperature and temperature are recorded with wide temperature. It is set to record once per hour, and print under the temperature grid at 1.00. 3.7 Negative sequence current The negative sequence current of the generator can be calculated by measuring the stator phase current. The rotor may be overheated and the rotor body burned out. It is necessary to monitor the change of negative sequence current for a long period of time. Therefore, in the program, it is set that the measurement of no-load short-circuit characteristics per hour is the most basic characteristic of the generator. It reflects the relationship between the magnetic field of the rotor and the amount of stator electricity. The comparison of no-load short-circuit characteristic curves during the period can determine whether the generator has a rotor inter-turn short circuit, etc., and measure the no-load short-circuit characteristic curve at each time the unit is started and conditions are met for comprehensive analysis in the future.
4 software preparation and its characteristics The system software selects Yuji 9588 programming Jlf1; VisualBasicYRfllliorlandC++BQVB is used to achieve the man-machine interface and the storage of various types of data search and other functions 31 combined assembly language program, is used to declare Connect the operation and screw hardware 10 acquisition card computer to prepare dynamic link library. Provides idle numbers for. 1; Adjusting the claw This system uses a large button interface, making it occupy a prominent position on the entire computer screen, easy for operators to view the real-time operation of the various parameters of the generator. All functions can be achieved simply by moving the mouse and clicking. The temperature of each part of the generator can be applied to the system software without seeing the operating instructions. It was originally displayed on three temperature inspection instruments. All the temperature measurement points of each inspection instrument of the system are displayed in a window. In the middle, it is convenient to compare the temperature between each measuring point, the status of the front state of the inspection instrument and the temperature alarm of the measuring point, and the cause of the alarm. At the same time, the timing recording and printing of the temperature of each measuring point are also set. The random recording and random printing function eliminates the trouble of the operating personnel's copying the temperature of each measuring point once per hour.
Manual random recording functions are set for important electrical parameters and generator rotor motion detection signals. Other parameters are only set to automatically record all data at a time and can be printed in the history query window.
In order to visually and intuitively view the changes of some parameters, special set and some curve query functions are used to monitor the current in the current and the power phase voltage and current of the generator in real time. The relationship between the current and the respective rating In the curve query of the temperature query, it is possible to select any five of all the temperature measurement points as one. The inside change curve; in the overheat alarm curve query, it can show its trend in the sky according to the ion current value recorded every 10 times.
In order to facilitate viewing all the alarm conditions of each temperature measuring point of the generator, the historical temperature alarm inquiry function is also set. If there is an alarm, the number and time of the alarm point and the cause of the alarm are recorded so that it can be used to find the point once alarmed.
5 On-site operation The monitoring system has been operating since October 1999. It has been in a factory with 300 miles, and the site is 5. ç¼. There are 4 cymbal shell tyrants, and the error is very small. It can meet the requirements of vertical monitoring and the operation of the instrument is safe and does not affect the normal operation of generator-related equipment and instruments. The print format is designed according to the requirements of power plant operation copying, so that the operating personnel can exempt from copying, and it is convenient for future data statistics and failure analysis.
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