Automatically record the hydrogen humidity and temperature of the stator negative sequence current generator of each electrical generator of the temperature of each part of the secondary generator every hour, and can print out every 241 through the printer! Recording the secondary rotor winding dynamic measurement waveform Each time the ion current value of the secondary insulation superheat monitor is measured and recorded, the temperature of each part of the generator can be queried according to the hour. Hydrogen humidity and all electrical quantities. The ion current percentage change of the insulation superheat monitor is checked by day. Curve and rotor winding motion waveforms. Use any 5 temperature measurement points as the group to query the temperature change curve of all temperature measurement points on a monthly basis. All values ​​and curves can be printed at any time.

The idling characteristic curve and the short-circuit characteristic curve of the measurable generator can automatically list and plot the test data into a curve. The curve can be observed and recorded at any time by any data processing or interpolation. 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 the system is input through two ways. It is converted by data acquisition in the expansion slot. It is the source of the signal input through the serial port of the industrial computer. 1 is connected from the sensor to the output of other monitoring instruments. 2.1 The temperature of the system is sent from the serial port of the three temperature detectors of the generator. The output signal line is connected in parallel and then connected to the serial port of the industrial computer through the root cable. 22 Electrical quantity The electric quantity of the system is connected with the generator phase stator current phase stator voltage rotor current rotor voltage various power access modes +like.

Due to the on-line monitoring, the instrument works with the main equipment for a long time. To prevent the instrument from malfunctioning, the secondary side of the current transformer may be opened. The device is not connected to the current loop. Instead, three precision levels of 0.1 are used. The micro-piercing 1 is worn on the secondary circuit conductor of the current transformer of the hairpin, and the secondary current can be converted into the AC data 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 high-precision miniature of the 01 class. The terminal is directly connected to the generator and the voltage transformer is used for safety. The dragon uses the terminal with the fuse to measure the rotor current and voltage. The transmitter of the original survey month is called the road transmitter output is 20. Considering the original resistance and transmitter load capacity in the loop, a 200 is inserted in the loop, and the 屯 attached resistor is strictly verified beforehand. The rotor voltage and current signals are respectively connected to two different acquisition blocks. The two transmitters are all connected to the same computer. In order to avoid interference between the controller and the computer, between the two acquisition cards and the industrial computer Both have taken bus isolation.

2.3 The amount of hydrogen The signal of the hydrogen amount of the system is derived from the hydrogen humidity transmitter of the generator. The model is 1260. The instrument is installed on the hydrogen circuit of the zero meter layer of the generator. The instrument passes the humidity sensor and the heating. Sensor measurement, relative humidity and ugly and temperature of the gas 7. The instrument has two kinds of output modes, the type is 3485422 and the output is the other; the other is the dual-pass 逍 analog output. The system adopts the analog output mode, and adopts the industrial control machine. In the number of entrance halls, the 1 card is also used as a bus, away from the hydrogen, and the monitor is farther away from the control room to reduce interference. Two twisted-pair shielded switches are used. 2.4 Insulation overheat monitor signal input insulation overheat monitor is divided into The detector and the remote controller 2 part, the remote controller is installed beside the control room disk, and the detector is installed in the detector below the generator. The ion current is amplified to the milliampere level current to 10, about 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, the current loop of the instrument is connected to a 50, the resistance, the ion current is 10, and the voltage is 1 to avoid mutual interference when the industrial control hook overheat monitor is running, and the bus optical isolation is used to 2.5 rotor. The detection signal input rotor winding inter-turn short-circuit detection times is directly taken from the fixed air gap of 32 slot harmonics, in order to truly reflect the shape of the rotor winding leakage magnetic field, the data acquisition card with higher sampling speed is selected.

The multiple acquisition cards used in the system are all 12-bit, but the acquisition speed is not the same as the synchronous acquisition acquisition card used for AC power. The acquisition speed is as high as the sampling requirement of 1 frequency, and the optical isolation of the acquisition card is Form, the establishment of its signal is relatively slow, but it can also meet the requirements due to the turbulence of the cargo.

3 System function settings 3.1 Temperature quantity The system temperature quantity is currently recorded and printed every hour. This is based on the 3.2 electric quantity set by the generator anti-accident measures required by the original Hubei Provincial Electric Power Bureau. Recorded once per hour, this is mainly for the printing of the temperature quantity record, only the active power at the time of temperature printing, it is convenient to directly compare the temperature of the different working conditions in the grid. The temperature difference alarm is when the temperature of a certain measuring point is higher than The specified value is higher than the average value of all similar temperature points. The system is set to alarm. The temperature measuring components of the factory are installed in different parts. Even if the same type of temperature measuring point 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 be recorded every 2 times. Because the rotor winding voltage is not high, the inter-turn insulation damage and development speed is relatively low, and it will not break down. Therefore, 24 records are performed once. Can meet the requirements without setting the timed print, can be adjusted to print at any time when needed.

3.5 Insulation overheat monitor's ion current system tests every 1 time and records the current output. This is considering that the overheat monitor may have a false alarm. The operator needs to have enough information for reference, then the ion current in the near hour. The trend of change is very important information.

3.6 Hydrogen temperature and temperature are recorded in a wide temperature record. It is recorded as 1 time per hour. At 1 hour, it is printed below the temperature grid. 3.7 Negative sequence current can be calculated by measuring the stator phase current. The negative sequence current of the generator is too large. It is possible to partially overheat the rotor and burn out the rotor body. It is necessary to monitor the change of the negative sequence current for a long time. Therefore, the measurement of the no-load short-circuit characteristic of the 3.8 no-load short-circuit characteristic in the program is the most basic characteristic of the generator. It reflects the relationship between the rotor magnetic field and the stator power. During the comparison of the no-load short-circuit characteristic curve, it is possible to judge whether the generator has a rotor inter-turn short circuit, etc., and record the no-load short-circuit characteristic curve every time the unit starts and has conditions for future comprehensive analysis.

4 software compilation and its characteristics The system software selects the programming Jlf1 of Yus 9598; VisualBasicYRfllliorlandC++BQVB is used to realize the functions of man-machine interface and storage search of various types of data and 31 combined with assembly language program, it is used to declare Connect the operation and screw the hardware 10 to capture the card computer to compile the dynamic connection library. Provide free access. 1; The claw system This system uses the interface of the large button, so that it occupies a prominent position on the entire computer screen, which is convenient for the operating personnel to check the real-time operation of the various parameters of the generator. All the functions can be achieved with just the movement and point of the mouse. If you have not read the operation manual, you can use the free temperature of each part of the system software. The temperature is originally displayed on the three temperature inspection instruments. Now all the temperature measurement points of each inspection instrument of the system are displayed in one window. In the middle, it is convenient to compare the temperature between the measuring points, 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 manual of each measuring point temperature are also set. The random recording and random printing functions eliminate the trouble for the operator to transcribe the temperature of each measuring point once per hour.

For the important electrical parameters and the generator rotor test signal, the function of manual random recording is set. Other parameters are only set to automatically record all the data and can be printed in the history query window.

In order to facilitate the visual observation of some parameter changes, the real-time monitoring of the electrical quantity of the curve query function and the historical data query can be used to visually display the power phase voltage and current of the current or previous generator and the rotor. The relationship between the current and the respective rated values ​​In the curve query of the temperature query, any five of all temperature measuring points can be selected to be in one. The curve inside the curve; in the curve query of the overheat alarm, the trend of the day in the sky can be displayed according to the ion current value recorded every 10 times.

In order to view all the alarm conditions of each temperature measurement point of the generator, the function of historical temperature alarm inquiry is also set. If there is an alarm, the time of the measurement point number and the cause of the alarm will be recorded, so that it can be used to find the measurement point that has been alarmed in the future.

5 On-site operation The monitoring system has been in operation since October 1999. It has been in a factory of 300 倨榔, site 5. 缁, 诵 诵 瘛 瘛 瘛 幽 幽 幽 幽 幽 , , , , , , , , , , , , , , , , , , , , , , , It can meet the monitoring requirements and the instrument is safe to operate without affecting the normal operation of the generator-related equipment and instruments. The print format is designed according to the requirements of the power plant operation copy, so that the operation personnel can avoid the pain of copying, and facilitate future data statistics and failure analysis.

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