Simulation Program of the Effect of Parameters of a Magnetic Information Recording Channel on its Amplitude-Frequency and Phase-Frequency Characteristics

2017 ◽  
Vol 4 (36) ◽  
Author(s):  
Vladimir Leuhin
Keyword(s):  
Frequency Characteristics ◽  
Simulation Program ◽  
Information Recording ◽  
Recording Channel

Research on the Frequency Dynamic Characteristics and UFLS Scheme in Shanghai Subzone Power Grid

2013 ◽  
Vol 291-294 ◽  
pp. 2291-2297
Author(s):  
Wen Qing Yang ◽  
Wei Cao ◽  
Zhi Gang Ding
Keyword(s):  
Dynamic Characteristics ◽  
Power Grid ◽  
Peak Load ◽  
Frequency Characteristics ◽  
Power Grids ◽  
Load Shedding ◽  
Transient Simulation ◽  
Simulation Program ◽  
Equivalent Model ◽  
Ring Network

Shanghai main power grid is operating in 500 kV ring network and with voltage-grading & district-dividing structure, and its subzone power grids have their own frequency characteristics. The paper has used district-dividing single equivalent model to check the parameters of components in BPA transient simulation program, and the original under frequency load shedding (UFLS) scheme was improved. Then the frequency dynamic characteristics of isolated subzone grid is analyzed, so does the adaptability and frequency safety of power grid under the new UFLS scheme in the condition of peak load in the summer of 2011.

Symmetry and Properties of Genetic Information Recording in DNA

2011 ◽  
Vol 43 (6) ◽  
pp. 40-48 ◽  
Author(s):  
Nikita A. Gupal ◽  
Anatoliy M. Gupal ◽  
Alexey V. Ostrovskiy
Keyword(s):  
Genetic Information ◽  
Information Recording

New aspects of power grid facilities personnel workplaces electromagnetic environment

2020 ◽  
Vol 60 (9) ◽  
pp. 569-574
Author(s):  
Nina B. Rubtsova ◽  
Sergey Yu. Perov ◽  
Olga V. Belaya ◽  
Tatiana A. Konshina
Keyword(s):  
Transmission Lines ◽  
Power Transmission ◽  
Power Grid ◽  
Spectral Characteristics ◽  
Ground Level ◽  
Frequency Characteristics ◽  
Frequency Range ◽  
Electromagnetic Environment ◽  
Limit Values ◽  
Special Assessment

Introduction. Electromagnetic safety of power grid facilities staff requires the exclusion of electromagnetic fields (EMF) harmful effects. EMF is evaluated by 50 Hz electric and magnetic fields (EF and MF) values in the framework of working conditions special assessment, and very rarely the analysis of the electromagnetic environment (EME) is carried out in depth. The aim of the study - EME hygienic assessment of power grid EHV facilities personnel workplace with adequate 50 Hz EF and MF levels evaluation as well as the analysis of EF and MF in the frequency range from 5 Hz to 500 Hz amplitude-frequency characteristics. Materials and methods. 50 Hz EF and MF values assessment was carried out on open switchgears (S) of substations and within sanitary breaks of 500 and 750 kV overhead power transmission lines (OTL). Measurements along to OTL trasses was performed using matrix-based method. Measurements and analysis of EF and MF values in 5-500 Hz frequency range amplitude-frequency characteristics were performed in the territory of 500 and 750 kV S. Results. Power frequency 50 Hz measurements results at 500 and 750 kV S ground-level personnel workplaces showed the presence of an excess of permissible limit values by EF intensity and the absence of an excess by MF. The measured EF values within 500 and 750 kV OTL sanitary gaps require limiting the working time of linemen due to the excess of the hygienic norms for full work shift, while the MP levels were almost completely within the standard values for persons not occupationally connected with electrical installations maintenance. MF and EE frequency range from 50 Hz to 500 Hz spectral characteristics analysis showed that 3rd harmonic percentage does not exceed 2.5% for EF and 6% for MF of the main level, the level of the 5th harmonic does not exceed 1% for EF and 3.5% for MF, the level of the 7th harmonic does not exceed 0.2% for EF and 0.8% for MF. These data show despite its low levels the contribution of MF different harmonics in a possible adverse impact on humane than EF corresponding harmonics. Conclusions. There was the confirmation of the previously justified use of the "matrix" scheme for of EF and MF values measurement along OTL routes. The relevance of to EF and MF all frequency components expos ure assessing possible health risk in extremely high voltage S territories and under OTL, based on international recommendations due to the lack of sanitary regulations in the Russian Federation for >50 Hz-30 kHz EF and MF, is shown.

ANALISIS DAYA TAMPUNG BEBAN PENCEMARAN AIR SUNGAI MENGGUNAKAN PENDEKATAN WATER QUALITY ANALISYS SIMULATION PROGRAM (WASP)7.3 (DAS SIAK BAGIAN HILIR KABUPATEN SIAK)

2019 ◽  
Vol 17 (1) ◽  
pp. 23
Author(s):  
Ivnaini Andesgur ◽  
Imam Suprayogi ◽  
Pipi Handrianti
Keyword(s):  
Water Quality ◽  
Simulation Program

Daerah Aliran Sungai (DAS) Siak termasuk DAS kritis khususnya bagian hilir, dimana terjadinya penurunan debit dan kulitas air sungai yang dipicu oleh meningkatnya aktivitas disepanjang aliran sungai yang didominasi oleh kegiatan perkebunan. Penelitian ini bertujuan untuk menganalisis daya tampung beban pencemaran BOD, COD dan TSS pada DAS Siak bagian hilir menggunakan metode WASP 7.3; dan menentukan besar reduksi beban pencemarannya. DAS Siak bagian hilir dibagi menjadi 14 segment kemudian dilakukan simulasi beban pencemaran parameter BOD, COD dan TSS pada masing-masing segment. Pada simulasi ini digunakan debit minimum yaitu sebesar 151 m3/dt dilanjutkan dengan mereduksi beban pencemarannya sebesar 75%, 50% dan 25% sampai sesuai dengan baku mutu air peruntukan kelas II.  Hasil Pemodelan WASP7.3 Daya Tampung Beban Pencemaran DAS Siak bagian hilir kabupaten Siak pada debit andalan minimum masing-masing untuk parameter BOD sebesar -68.877,82 kg/hari, COD sebesar -300.242,11 kg/hari dan TSS sebesar -169.065,78 kg/hari, dimana tanda minus (-) menandakan bahwa beban pencemar melebihi daya tampung sungai. Reduksi beban pencemar untuk parameter BOD sebesar 75%, COD sebesar 50%, dan TSS sebesar 25%. Parameter BOD merupakan parameter tertinggi dilakukan reduksi karena semua segment pada DAS Siak bagian hilir kabupaten Siak melebihi baku mutu peruntukkan kelas II. Kemampuan DAS Siak bagian hilir kabupaten Siak untuk menampung beban pencemar berdasarkan baku mutu peruntukkan kelas II setelah dilakukan reduksi masing-masing parameter pencemar adalah BOD 75% sebesar 12.134,95 kg/hari, COD 50% sebesar 12.958,94 kg/hari, dan TSS 25% sebesar 36.280,66 kg/hari.

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