Railway and Transit

Signaling Systems

Ground detection is vital in the proper operation of railroad and transit signaling. Ground fault current can be the difference between a signal relay improperly energizing or de-energizing, resulting in incorrect rail signals. While operating as ungrounded systems, signaling systems still require preventive measures in order to maintain proper relay energization. BENDER's iso685 ground detector negates the need for frequent voltage and current testing by continuously monitoring the insulation resistance of the AC and/or DC system. Preventative alarm values allow for the early detection of leakage currents before the making/breaking capacity is reached. Alarm indicators and contacts are available if a ground occurs.

Electric Switch Heaters

Switch heaters require continuous operation, especially during wintry weather conditions. A ground condition, which can be created by factors such as improper track grounding and wet areas, may cause little to no power to reach the heating resistor, thereby causing poor operation. The RCM420 ground detector continuously monitors for ground faults in a grounded heating system. Its compact size and allows for easy integration into heater control panels. Alarm contacts allow for external alarm indication.

Inside the Locomotive / Car

Electrical systems inside the train are as important as those outside the train. Systems such as lighting, floor heaters, and traction drives may be grounded or ungrounded, AC or DC, and single-phase or three-phase. A ground condition on any of these systems may cause shock hazards and/or damage to equipment. BENDER's diverse selection of ground detectors covers a wide range of applications:

  • Grounded AC systems, single- or three-phase, all voltages
  • Grounded AC/DC systems, single- or three-phase, all voltages
  • Ungrounded single-phase AC/DC systems up to 300 V
  • Ungrounded single-phase or three-phase AC/DC main systems