The WITT EPM 4 measurement device monitors the potentials of the connected grounds and evaluates the occurring voltages (see technical specifications). This device does not need any auxiliary power supply; the electrical power is supplied by the monitored input voltage.
While operating DC railways with the running rail as return conductor various ground resistances generate voltages that might be dangerous for humans or buildings. One of the measures to protect humans from impermissible contact voltages is the temporary shortcircuit of the various grounding systems according to DIN EN 50122-1. The EPM 4 monitors the relevant potentials and delivers reports for further actions.
The voltage between the earths or return conductor respectively that are to be monitored is continuously measured. By exceeding the threshold setting a switching command is given via a potential-free changeover for the activation of further devices such as an earth shortcircuiting device or an isolator.
WITT Solutions GmbH is an owner-managed, medium-sized high-tech company that develops and sells measuring and testing technology for monitoring power supply and superstructure systems for rail-bound traffic. Our professional power monitor products monitor e.g. earthing potentials, cable faults and contact voltages and are I4.0 capable as well as Railway Federal Office(EBA) approved products. With our innovative rail infrastructure monitoring systems, we are cooperation partners of renowned companies.
Witt Solutions GmbH provides different power monitoring systems for the respective task - DC voltage monitoring, monitoring cable systems, short-circuit systems...
The SAM device monitors the surge arrestor (SA) within a certain railway section and reports broken ones via an integrated GSM-Modem.
The WITT EPM 3 measurement device monitors the potentials of the connected grounds and evaluates the occurring voltages.
The WITT TVM 4 device monitors the driving voltage of individual sections and supplies information about the voltage values.
WITT CM 3 is a self-resetting cable monitoring device for the detection of cable errors. Between signal and triggering a time delay of 4.8 sec is integrated.
WITT CM 4 is a self-resetting cable monitoring device for the detection of cable errors., used for insulation monitoring of cable systems in DC Systems.
The WITT EscS 7 is an auto-resetting earth short-circuiting device that accords to EN 50122 regulations for the protection of public and infrastructure.
The WITT EscS 6 (EKS8) is an auto-resetting earth short-circuiting device after DIN VDE 0115 part 300 and part 320.
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