1. Spacing
In order to ensure the compensation effect, the setting distance of the compensation capacitor should be as short as possible, so that the transmission channel characteristics tend to be "distributed parameters".
Increasing the "density" of the compensation capacitor setting is conducive to improving the train shunting, reducing the fluctuation range of the train shunting current in the track circuit, and conducive to extending the transmission length of the track circuit. However, setting the compensation capacitor too densely also increases the cost and brings inconvenience to maintenance, and comprehensive consideration should be given.
2. Capacitance
Under the same compensation spacing, its capacitance is:
(1) Generally, the carrier frequency is low and the compensation capacitor capacity is large;
(2) The minimum roadbed resistance is low, and the compensation capacitor capacity is large;
(3) The track circuit only considers increasing the locomotive signal entrance current, regardless of train shunting, and the compensation capacitor capacity is large.
3. Selection of spacing and capacitance
(1) Relay coding ZPW-2000A
①The general capacitance value is 55μF (1700Hz), 50μF (2000Hz), 46μF (2300Hz), 40μF (2600Hz).
②For lines with ultra-low roadbed resistance (such as tunnels, turnouts), choose 90μF (1700Hz), 80μF (2000Hz), 70μF (2300Hz), 60μF (2600Hz).
③Spacing: selected according to transmission calculation, generally long transmission length, short spacing. Set according to the track circuit adjustment table.
(2) Communication coding ZPW-2000A
The roadbed resistance is greater than or equal to 2Ω·km.
①Capacitance value 25μF;
②Section spacing: 60m (1700Hz, 2000Hz) and 80m (2300Hz, 2600Hz);
③Station spacing: 100m.
It should be emphasized that the above "spacing" is a spacing level, and the specific spacing length should be determined by the formula △=L/N.
Comments
participate in discussions
Please login ? to participate in the comments
New customer Start here.