1 Abstract This paper introduces the determination of the motor and compensation capacity of the random local compensation of the rolling motor, and the analysis of the economic benefits of reducing the network power consumption, improving the network voltage quality, reducing the user's electricity expenses and increasing the network power supply capacity. High-voltage motor local compensation; compensation capacity calculation economic benefit analysis 1 Overview Air compressor motor load is a continuous operation of inductive load, it not only consumes a certain amount of active power, but also draws from the network, a certain amount of power The power of the power is sufficient to establish a magnetic field to transmit and convert the energy test; the presence of the power of the power causes the apparent power transmitted by the power system to increase, that is, the actual operating current of the line increases. When the line power loss increases, the corresponding voltage loss is also increased, that is, the line voltage drop is large, which makes the quality of the power supply voltage drop, and also affects the power supply capacity of the transmission and distribution line. In short, it causes a great waste of electrical energy and a deterioration of the operating state of the system.
Therefore, it is necessary to minimize the inductive reactive power and increase the operating power factor of the network to reduce the power loss of the network.
The implementation of random reactive power compensation for the continuous operation of the squatting machine can minimize the increase of the power loss of the transmission and distribution lines and related devices caused by the inductive reactive power of the motor. The principle is to combine the compensation of centralized compensation with decentralized compensation. The electric motor adopts a single machine to compensate the economic benefit of the terminal with random compensation, which is far superior to the centralized compensation of the main transformer substation or the running workshop power distribution room. The centralized compensation in the main transformer substation can only compensate the line in front of the substation, and the local compensation of the high voltage motor compensates the user's distribution line. Therefore, the compensation effect is the best, and most of the economic effects of compensation benefit the user on the main or secondary exit side due to the user's electricity metering point.
2 reactive power compensation motor high voltage motor local reactive power compensation is parallel compensation. 1 is simplified for wiring, and 2 is vector analysis.
In the last two. For the grid voltage, + is the grid input current. In the case of no capacitor compensation, the input current is +212. The 0 segment can be decomposed into active current 2, 3 segments, and inductive reactive current + 712. .
With voltage. In phase, the heart phase lags behind the voltage 790.
The phase of the zero segment of the current +212 lags behind the voltage angle, that is, the power factor angle before compensation.
After the splicer is connected, the sinusoidal reactive turbulence, in phase and the inductive reactive current, can offset some of the inductive gong current. In this way, the inductive reactive current of the line is reduced to the section of the heart of the heart. The network operating current becomes smaller, the power factor is increased, and the adverse consequences caused by the network are weakened. If +=, the inductive reactive current in the network is completely offset by the capacitive reactive current of the capacitor. This is called full compensation. At this time, the power factor is 9=1. At this time, the network output is all the line loss caused by the reactive power and the power flash. Reduced active losses on transmission and distribution lines. The loss of line power is proportional to the square of the current. The 5-port = 3 brother type is the line resistance. After the parallel capacitors, the current of the transmission and distribution lines becomes smaller, and the power loss will be determined with the current value. 3 The local motor reactive power compensation capacity is determined by our company's air compressor station. There are 6 air compressors respectively driven by 6 101 card motors. move. The rated output of each motor is 1475. The number of poles is 2 rpm. 2850 is forced. The rated current is = 101. The actual running current = 8524. The power factor is 0.85. Now, you want to compensate. 2=095 The number of kilometers should be compensated for the calculation of the compensation capacity. The calculation is based on the motor of the stage, but considering the on-board operation of the electric card, the actual voltage output is reduced, so the compensation capacitor of the compensation capacity of 32 is compensated. Directly connected to the induction motor, when the motor is cut out from the line and has not stopped rotating, it may exceed the system voltage and voltage due to self-excitation. To avoid this, the rated current of the capacitor should be less than the no-load current of the motor. The device does not generate self-excited overvoltage.
4 Accounting and analysis of economic benefits after compensation 1 Know 6 models of the same capacity of the main transmission line steel core stranded wire, the wire, the resistance is 0145 Shanmao, so the total line resistance is the hole = 0145, the father 1221 = 177 Plus the sum of the distribution line and switch resistance of a single motor. For the total operating current of 186 motors = 5 compensation, the average running current of each motor is = 42. The line active loss before compensation is compensated by the line. The active loss of the line is J2=3i, and the power loss of the line after compensation is 456. The total amount of active power saved per year after the motor compensation is calculated by the annual operation of 800. 1 kilowatt, 46 years of electricity saved by 6 motors in 46 years, the average industrial electricity price in the two Jin districts, 6 yuan 47 economic recovery period, the price of each set of equipment is 57.34 million yuan, the total price of six sets of motor compensation equipment is 30 9 months All investments can be recovered in ten years and ten years. This compensation device can be used continuously for 12 years and 15 years. 48 sets of equipment increase the transmission and distribution lines and phase cooling electrical equipment. The capacity increase rate is 49. After the compensation, the current drop decreases the voltage drop on the transmission and distribution lines, which guarantees the quality of the supply voltage.
410 due to the drop in current, reducing the heat output of transmission and distribution lines and related electrical equipment =, 24 and. , extending the service life of the line and related equipment.
5 motor reactive local compensation device performance characteristics introduction 51 reactive power compensation cabinet capacity design is 40031. For 1475 Na 2 cutting motor, reactive power compensation capacitor and motor simultaneously input and cut.
52 capacitors use full-film medium, internal 4 series, component voltage 1580, lower than 21 conditions, low field strength, low dielectric loss, low temperature rise, greatly increasing the service life of the compensation cabinet.
The 53-seven-function compensation device is connected in parallel with the capacitor element by the discharge line, so that the device can be discharged after the power is turned off, and the use is safe, and the phase unbalanced voltage can be provided for the upper-stage switchgear protection.
54 configuration 1 core dry series reactor to limit the inrush current and improve the reliability of the compensation cabinet.
When the vacuum circuit breaker is used to cut the capacitor bank, there are still two sails with a re-ignition rate, which is protected from the overvoltage of the operation and absorbs the energy of the card. A zinc oxide snoring device is installed on the incoming busbar of the capacitor, and the capacitor capacitor machine is used for protection. 6 Conclusions For the 10 political high-voltage motor, the single-machine local compensation is implemented, and the economic effect such as power saving is remarkable, and the entire investment can be recovered only in a few years. The compensation device can be connected for 1215 years. Tired economic and social effects are considerable.
Liu Jianwei, 1973, female. Huludao, Liaoning, an engineer, mainly engaged in the design of power systems in factories.
Bai Zhidan 1977. Male. Liaoning Jinzhou people. Assistant engineer. Mainly engaged in the design of high and low voltage reactive power compensation devices.
Zheng Yi 1978, male, Jinzhou, Liaoning. Assistant engineer, mainly engaged in the design of high and low voltage reactive power compensation devices.
The national power capacitor industry and related units are recorded on the fifth page of the errata. Xi'an Electric Power Industry Research Institute, the industry's electric report is written as 29 82441423, the correct number is 29, the number of 21,423 heart pages, the serial number of Henan Zhongyuan Power Capacitor Co., Ltd. is wrongly written as Liu Shanyu The correct website is the milk, 10, page 16 in the serial number 62 Anhui Hengxing Power Equipment Co., Ltd. The telephone and fax area code is mistakenly written as, 5 the correct area code is, 551 page 16 in the serial number 63 Hefei Tianbao electrical equipment The fax area code of the limited liability company is mistakenly written as the correct area code of 05. On the 18th page of 551, the contact number of No. 72 Guangdong Shuntai Capacitor Electric Co., Ltd. is mistakenly written as Chen Xiaomin; the correct contact person is Xuan Guoqing; 1 Xi'an Xirong Electric Manufacturing Co., Ltd. was mistakenly written as Gao Xiaolin; the correct legal person is Kang Aiqi.
Apologize for the mistakes we made at work! Thanks to the readers who pointed out the mistake! . 13
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