ETOVPD22 — rail voltage limiting device (VLD) for 750/1500 V traction networks
ETOVPD22 is a rail voltage limiting device for 750 and 1500 V DC traction networks. A contactor and thyristors short the rail to earth when the voltage exceeds the permissible value. The apparatus protects personnel and passengers at substations, platforms and depots.
- Rated voltage
- 1500 / 750 V DC
- Maximum voltage
- 1800 / 900 V
- Protection range
- contactor DC 25–300 V (step 1 V, 0–1000 s); thyristors DC 300–1000 V instantly
- Operation
- microsecond shunting
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
The voltage limiting device ETOVPD22 (Voltage Limiting Device, VLD) is installed in DC traction networks so that the rail potential does not rise to values dangerous for personnel and passengers. The protective functions are built to the human safety standard KS C IEC 62128-1, and the rail voltage to earth is held within a safe range. Typical installation sites are traction substations, passenger platforms of metro, tram and DC railway systems, and depots.
When the voltage exceeds the permissible value, the device shorts the rail circuit to earth. At small overvoltages a contactor with a time delay operates, and at large ones the power thyristors (SCR) shunt the circuit instantly, within microseconds. This division matches the characteristic of the safe effect of current on a human. The measurement, protection, control and communication modules are integrated into one system, so the VLD interacts with the traction power supply protection and performs reclosing, that is, opening of the shunt, under control of the ETCPU200 module. After the overvoltage disappears, the shunt opens and the rail circuit returns to normal operation isolated from earth.
The ETOVPD22 contains two sets of shunting devices, in each of which bidirectional thyristor modules are connected in parallel with contactors. The ETCPU200 module combines the thyristor driver, current and voltage transformers, and the measurement, protection, control and communication modules. The contactor has high mechanical wear resistance and the thyristors are fast. The components are compatible with apparatus of the same ratings and standards, and maintenance is straightforward. Dimensions are changed by agreement with the manufacturer, and a surge arrester is added if needed.
Rated network voltage is 1500 and 750 V DC, maximum 1800 and 900 V. According to the manufacturer's table, rated current is 1250 A and short-time withstand current is 50 kA for 250 ms. The contactor protects in the range DC 25–300 V in steps of 1 V with a delay of 0–1000 s, and the thyristors in the range DC 300–1000 V operate instantly. Control voltage is 110 V DC / 220 V AC, maximum endurance is 1.5 million operations, degree of protection IP41. The device complies with IEC 61992-6, EN 50123-6, KS C IEC 62128-1 and EN 50122-1.
Technical specifications
| Rated voltage | 1500 / 750 V DC |
|---|---|
| Maximum voltage | 1800 / 900 V |
| Protection range | contactor DC 25–300 V (step 1 V, 0–1000 s); thyristors DC 300–1000 V instantly |
| Operation | microsecond shunting |
| Endurance | 1.5 million operations |
| Degree of protection | IP41 |
| Composition | 2 sets of bidirectional thyristor modules with contactors; ETCPU200 module |
| Standards | IEC 61992-6, EN 50123-6, KS C IEC 62128-1, EN 50122-1 |
Request a price and lead time
ETOVPD22 — rail voltage limiting device (VLD) for 750/1500 V traction networks. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
Customs codes
| UKTZED (Ukraine) | 8535 90 00 00 |
|---|---|
| HS, 6 digits | 8535 90 |
| CN (EU) | 8535 90 00 |
| HTSUS (USA) | 8535 90 00 80 |
| China customs tariff | 8535 90 00 00 |
Codes are for reference: the final code is determined at declaration for the specific model.
Questions and answers
How does the protection work at different overvoltage levels?
In the range DC 25–300 V a contactor with a delay of 0–1000 s shorts the rail to earth. At DC 300–1000 V the thyristors shunt the circuit instantly.
Which standards does the ETOVPD22 comply with?
The device complies with IEC 61992-6, EN 50123-6, KS C IEC 62128-1 and EN 50122-1.
What endurance and degree of protection does the device have?
Maximum endurance is 1.5 million operations, degree of protection IP41. Control voltage is 110 V DC or 220 V AC.
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