HVITC Track Circuit
The main function of a track circuit is to detect the presence or absence of traffic on a given railway section of track. High voltage impulse track circuit (HVITC) designed and manufactured by ACTOM Transport, is a comprehensive range of jointed track circuit products, which can be adapted to any kind of track configuration.
An HVITC includes:
- A transmitter, which generates impulses with a given shape, amplitude and recurrence frequency injected into the tracks by means of a matching isolating transformer
- A receiver, which detects at the other end of the track section the specific signal and operates the failsafe relay, if the specific signal responds to the correct positive and negative amplitudes.
- HVITC track circuits are adaptable to these applications
- Single rail arrangement for a length between 18 m and 750 m
- The length can be extended to 1 000 m, provided one transmitter per track circuit is used
- Non-electrified lines
- DC electrified lines with: 750 V, 1 500V, 3000 V traction
- AC electrified lines with 25 kV, 50Hz or 60Hz 15kV, 162/3 Hz
- Minimum ballast resistance from 0,6 – 2 ohm/km
- Drop shunt from 0,15 – 1 ohm
- Impulse recurrence frequencies: 3 Hz
- Impulse width: 3 milliseconds
- Voltage peak value: 100V
- Current peak value: 100A
- Standard length of track circuit (with ballast resistance equal to 2 x 2 ohm/km).
HVITC consists of the following basic elements:
- Power supply: 110V-115VAC 50hz or 60Hz
- Transmitter: Power 45 VA, 24VDC Voltage limits: +20% – 6%
- Peak-to-peak max. ripple: 5%
- Transmitter: 50 W for 24 V equipment
- The receiver NCO RVT 600 consists of two integrating circuits. The first circuit receives energy from the negative part of the impulse; the second circuit receives energy from the positive part of the waveform.
- Fail-safe thresholds, and different thresholds eliminate electrical disturbances.
Track relay: NCO CVTH 188.8.131.52. The NCO RVT 600 receiver and NCO CVTH track relay do not require any power. The energy is provided from the track signal.