High Voltage and Current Measurement on Rolling Stock

The Most Space Saving High Voltage Transducer for Rolling Stock

The P45000 series transducers are designed for measuring high DC and AC voltages on heavy vehicles, especially rolling stock. Monitoring and control of traction motors, monitoring of DC link voltage in traction power converters or on-board converters are some application examples.

The voltage measurement input is highly isolated from output and auxiliary power. The current output is compatible with commercially available control inputs. The housing offers flexible mounting options: upright or horizontal screwed or snapped onto 35 mm DIN rails. The devices can even be mounted in a stack, allowing for very tight space requirements.

For the first time, applications with functional safety requirements can be properly carried out. The high-voltage transmitter is certified for use in SIL2 systems and, redundantly, SIL3. Thus, for example, the presence of dangerously high voltages can be reliably detected.

P45000 – High Voltage Measurement

The P45000 high-voltage transducer for all DC and AC rail vehicles including diesel-electric vehicles for measurements up to 4500 V DC and 3000 V AC. Test voltage 20 kV AC and reinforced insulation up to 4800 V DC and 3700 V AC

P51000 – Current Measurement via Shunt

The P51000 transducer has been designed for verload-protected current measurements via shunt resistor from amps to kiloamps. Even strong electromagnetic fields cannot influence the measurement result. This yields highly precise current detection.

P52000 – Voltage Measurement

High voltage transducer featuring a compact design for voltage measurement up to 4800 V. High-voltage contacts and connections are encapsulated. There is no danger of interaction with other components. When dimensioning, additional space between junction blocks is no longer needed: The P52000 functions with complete safety.

P52000VPD – Voltage Presence Detection

The P52000VPD voltage presence detector is designed to perceive voltages between 50 and 4200 V. The input signal is compared to a threshold value and the resulting binary information is galvanically isolated and transmitted to the output circuit. When the input voltage exceeds the set threshold value, a solid state relay opens, signaling the presence of voltage at the input.

Many systems in and on rolling stock require information on the current speed at any given time. They include brake systems and drive technology, two systems that are key to functional safety. This is why the speed encoders available to the speed signal must function reliably and precisely.

If additional systems need to process speed information, additional speed encoders are usually mounted on the vehicle axles. But space is limited there. And installation and wiring are an investment in money and time. With the P 16800 and P16000, Knick provides an extremely simple solution. The signal of an existing speed encoder is decoupled and made available for other applications. The process is non-interacting in accordance with SIL safety level. The speed encoder signal is neitherinfluenced nor interfered with on its way to the control unit.

The speed signal doubler P16800 is the ideal solution for retrofitting rail vehicles. The device helps to quickly and cost-effectively implement the extensive requirements for odometry that e.g. result from the European standardized train control system ETCS.

P16800 – Universal Speed Signal Doubler SIL2/SIL4

The use of the P16800 simplifies the retrofitting of rail vehicles with control systems that require speed information, or makes such retrofitting possible in the first place. In new vehicles, the number of speed sensors can be reduced, which optimizes initial and maintenance costs.

P16000 – Pulse Counter/Pulse Transmitter SIL3

Pulse frequency conditioners for decoupling of signals from safety-related circuits and doubling of standard and impulse signals. The speed encoder signal is neither influenced nor interfered with by the P16000 on SIL 3 safety level.