Power loss consists of management line losses and technical line losses. Reducing the loss of power supply is like twisting a towel. By strengthening operational management, management loss can be reduced significantly. If the line loss drops to a certain level, it will be difficult to extrude the moisture. It is necessary to strengthen the management of technical line losses and reduce the technical loss. This paper proposes a viewpoint from the equipment selection, aiming at attracting attention and promoting the reduction of technical line loss.
The traditional core structure of the transformer is planar. At present, the triangular wound core transformer breaks through the traditional frame and uses three semicircular coil cores with the same rectangular shape to form a three-dimensional three-phase transformer core, making the three-phase core magnetic circuit. Fully symmetrical, magnetic resistance is greatly reduced, excitation current and no-load loss are significantly reduced. It is a high-efficiency energy-saving transformer that uses transmission materials, but operates with less noise and has a more compact structure, and is worthy of promotion and application in distribution networks. Improve the economical operation of the distribution network.
The S13-MR triangular wound core transformer has greater performance improvement than the conventional laminated-plate distribution transformer. Compared with the S9-type distribution transformer with the same capacity, the no-load loss is reduced by 44% and the load loss is decreased by 7%. The load current is reduced by 90%, the noise level is reduced by 13dB, and the energy saving effect is significant.
The comparative analysis of a 10KV-class 50-1000KVA S13-MR triangular wound core transformer and a common structural core transformer shows that:
(1) Compared with the new S9, the no-load loss of the S13-MR reducer is reduced by 35.3%-46.5%. If comprehensive consideration is taken, the transformer no-load operation is to be carried out for 8700 hours and the rated load is to be run for 5,000 hours. The electricity tariff shall be calculated as 0.5 yuan/KW. , Calculation formula:
P=8700*Po+5000*Pk+0.05*8700Io%*Pn
In the formula:
P - annual savings of electricity kWh
Po - the difference in no-load losses of two series transformers of the same specification kW
Pk - the difference in load loss between two series transformers of the same specification kW
Io% - the difference between the transformer no-load currents of the same series of two series Pn - transformer rated capacity kVA
0.05 - Reactive Equivalence Example: A 1000KVAS13-MR transformer can save energy in one year than the S9 transformer: 8700(1.7-0.91)+5000(10.03-9.6)+0.05*8700*(1.3%-0.13%)* 1000=13460 (kWh) Saving electricity: 6730 yuan.
If the average power consumption per KVA is 13KW.h, the total capacity of the distribution transformers of the Wuhan Power Supply Bureau in 2002 is 2638570KVA. If all the S13-MR transformers are used, the annual energy savings will be 34.3 million KW.h, which will save electricity costs of 17.15 million yuan. No consideration was given to reducing the investment in reactive power compensation equipment.
(2) When the price of the S13-MR transformer is 1.3 times the price of the new S9, the average electricity price is calculated at 0.5 yuan/degree. Since the no-load loss is reduced, the cost of one-off multi-investment can be recovered by generally running for 1-2 years.
S13-MR transformer price evaluation:
Since 1981, in the procurement bid for transformers, the concept of transformer loss assessment has emerged internationally, and a comprehensive assessment of the product's performance and price has been made in order to obtain the maximum use efficiency.
The total operating cost of a transformer for a certain lifetime can be expressed by the following formula:
TOC=C+K0P0+KLPL
Where: C is the price of the transformer, Yuan P0 is the transformer no-load loss, W;
PL is the transformer load loss, W;
K0, KL are the no-load loss and load loss investment coefficient, respectively, yuan / W;
From the above equation, it can be seen that the larger K0, the greater the effect of P0 reduction on TOC reduction.
Take 500/10 as an example and do a comparative analysis.
Loss indicator: New S9 P0=960W, PL=5100W
S13-MR P0=540W, PL=4980W
Market reference price: New S9 48335 yuan S13-MR 50750 yuan price ratio is 1.05 times the price: For calculation purposes, regardless of no-load consumption and load consumption, are based on the average price of 0.5 yuan / degree.
The operating life is 2 years, the loss investment coefficient K = K0 = KL = 0.5 × 2 × 8760/1000 = 8.76 RMB / W
For the new S9, the total operating cost for two years is: TOC=48335+8.76×960+8.76×5100×(0.48)2=67037.9 (48% load factor)
S13-MR, 2-year total operating cost: TOC=50750+8.76×540+8.76×4980×(0.48)2=65531.5 (48% load factor)
After two years of operation, the new S9 also costs 1505 yuan more than the S13-MR transformer. That is to say, if the user purchases a 500KVAS13-MR transformer, the one-time investment will cost 2415 yuan more (that is, S13-MR will be priced at 2415 yuan more than the new S9). Then less than 2 years of operation, you can fully recover the cost of multiple investments at the time of initial investment. Generally, a transformer is operated for at least 20 years. From the second year, users can enjoy the remarkable economic benefits of the S13-MR ultra-low loss transformer.
S13-MR wound core transformers also have the following advantages:
1, no-load current is small. This is the characteristic that the laminated core transformer cannot match. Compared with the transformer with the same capacity, the no-load current of the wound core is only 10-15% of the no-load current of the laminated core. No-load current is small, one can reduce network loss; Second, increase the network power factor; Third, improve the effective utilization of power supply network equipment; Fourth, reduce the input of reactive power compensation equipment, can greatly save equipment investment and operating costs.
2, low noise. Compared with the lamination transformer with the same capacity, the noise is 8-10dB.
3, strong ability to resist short circuit. Due to the special results, this type of transformer is much more resistant to short-circuiting than the laminated core transformer.
4, long life. Because the oil tank is fully sealed, the transformer oil is isolated from the air, delaying the aging of the transformer oil and extending its service life.
Comparing the above technical and economical comparisons, S13-MR wound core transformers have the characteristics of ultra-low iron loss, ultra-high efficiency, environmental protection, energy saving, quick return on investment, low operating temperature, and can be widely applied in distribution networks.
Performance Data Product Type No-load Loss (W) Load Loss (W) Impedance Voltage (%) No-load Current (%) Total Weight (kg) Compared to S9 Product (kw-h)
S13-MR-30/10 80 580 4.0 0.28 320 864
S13-MR-50/10 110 830 4.0 0.25 424 1211
S13-MR-80/10 150 1200 4.0 0.22 511 1722
S13-MR-100/10 170 1440 4.0 0.21 570 2166
S13-MR-125/10 200 1750 4.0 0.20 673 2447
S13-MR-160/10 225 2060 4.0 0.19 736 3413
S13-MR-200/10 260 2520 4.0 0.18 846 3723
S13-MR-250/10 310 2880 4.0 0.17 1090 4689
S13-MR-315/10 380 3460 4.0 0.16 1130 5446
S13-MR-400/10 450 4980 4.0 0.16 1362 6051
S13-MR-500/10 540 4980 4.0 0.15 1615 7190
S13-MR-630/10 640 5900 4.5 0.15 2048 7884
S13-MR-800/10 770 7130 4.5 0.14 2583 9098
S13-MR-1000/10 910 9600 4.5 0.13 2830 13460
S13-MR-1250/10 1080 11800 4.5 0.12 3280 14790
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