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 Wysłany: Czw 9:53, 02 Gru 2010 Temat postu: uggs sale Frequency divider on the feasibility of |
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Frequency divider on the feasibility of removing
Carrier channel, the frequency can not be reused. b. Variable frequency division 220kV and 500kV outgoing variable outlet on the other side the same name as the phase between the 500kV qualify for a Q AQ A AJ + a + AY mouth of a 39 + +17-56 + a; synonym for a phase AQ Q - AJ + c2 + Av a 39 + a +22-61 + a. For the high-frequency protection channel, the frequency can be reused. For the carrier channel, sent a letter to the peak power level P is 4odS (voice letters power level P. To 36dB), for example,[link widoczny dla zalogowanych], if the line attenuation a> 24.7dB, the phase is the same name on the line AQ crosstalk attenuation a Q,[link widoczny dla zalogowanych],> 80.7dB, the frequency can be reused; if line attenuation \Line attenuation is generally small, therefore, the kinds of wiring,[link widoczny dla zalogowanych], the carrier frequency generally can not be reused. C. Variable frequency division 220kV and 500kV outgoing 220kV outlet outlet on the side between the same name as the phase change of a Q AQ AJ + a + a AY> 39 + a +39-78 + a; synonym for a phase AQ Q, a AJ + a + _Y> 39 + a +43-82 + port. For high frequency protection channel, the frequency can be reused. for the carrier channel ,[link widoczny dla zalogowanych], sent a letter to the peak power level P is 40dB (power level of voice letters P. to 36dB), for example, if the line attenuation a> 13.7dB, the crosstalk on the line attenuation of the same name relative to AQ a Q> 91.7dB, the frequency can be reused; if the line attenuation export> 9.7dB, the lines were compared on different crosstalk attenuation Q of a Q> 91.7dB, the frequency can be reused. d. Variable frequency division 500kV outlet and the outlet on the side 220kV 220kV other variables the same name as the phase between the outlet of a Q = AJ + Q + Ay mouth of a 39 + a +17-56 + a; synonym for a Q-phase AQ AJ + n + lY one a 39 + a + 22-61 + a. for the protection of high-frequency channel,[link widoczny dla zalogowanych], frequency 6. can be reused; the carrier channel, the frequency can not re-use, of the same b. e. Variable frequency division 500kV and 220kV outgoing 500kV outlet outlet on the side of change Q between the same name, a one-phase AQ AJ + d + iY> 39 + \For high frequency protection channel. Frequencies can be reused; the carrier channel, sent a letter to the peak power level P is 4OdB (voice letters power level P. To 36dB), for example, if the line attenuation a> 2.7dB, compared with the same name on the line AQ crosstalk attenuation a Q> 8O. 7dB, the frequency can be reused; line synonyms phase crosstalk attenuation AQ on a Q> 8O. 7dB, the frequency can be reused. 3.2.2 After the demolition of the frequency divider on repeated use of a. 500kV and 220kV variable frequency division qualifying phase on the name of the protection of different frequencies can be reused, the same name can not be relative to the Protection of the frequency re-use; b. 500kV and 220kV frequency division qualify on the change of carrier frequency can not be reused; C. Frequency division changed its outlet on the other outlet on the side substation protection of the frequency of high frequency can be reused; d. Frequency division changed its outlet on the outlet on the other side substation power line carrier frequency can be reused, the need for calculation and analysis. 3.3 Conclusion If you meet the following conditions, the frequency divider can be removed: a. 500kV and 220kV frequency division qualify on the change of power line carrier frequency does not re-use; b. 500kV and 220kV variable frequency division phase outlet with the same name is not on the protection of the frequency re-use; c. Frequency division changed its outlet on the outlet on the other side substation power line carrier frequencies are not reused. Since a large number optical circuit has been applied, the 220kV, 500kV substation and transmission line they use fiber optic communication circuits, high-frequency carrier circuit protection and out of operation gradually, the frequency arrangement is relatively easy. Taking into account the frequency divider in the system has been basically no longer necessary, therefore, it is suggested If you meet the removal of conditions. The device should be removed, to improve power system reliability, reduce power losses. Device removed, the arrangements and high-frequency power line carrier channel frequency protection. Should try not to repeat the frequency of use, if the frequency of tension to be reused, they should consider the 500kV, 220kV line carrier frequency and high frequency protection channel crosstalk effects, checking the circuit, respectively. (Editor Li Jianping)
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