Bender offers a wide range of different voltage and frequency monitoring devices. They range from single-phase voltage and frequency monitoring devices, through special solutions such as analogue voltage monitoring devices for nuclear power station applications to three-phase system and installation protection for decoupling in power generation systems. They all provide the necessary information advantage so that faults and malfunctions can be detected at an early stage and measures can be implemented before time-consuming, expensive interruptions to operation and installation damage occur.

The extensive functions available with the new VMD461 voltage relay and the expansion of the permissible nominal system voltage via the CD440 coupling device will allow new markets to be opened up.

The internationally valid and recognised ANSI codes[1] for the measurement and monitoring functions are mapped in the VMD461.

The shutdown functions have a three-stage structure. In this way, it is for example possible to set up underfrequency/overfrequency monitoring and undervoltage/overvoltage monitoring with three threshold values each and a corresponding response delay.

The VMD461 unit covers the nominal voltage range up to 400 V without an additional, external coupling device and is multifunctionally configurable. For nominal system voltages > 1200 V the new CD440 coupling device is to be used in conjunction with the voltage relay.

In addition, the new VMD461 can be used optionally for a wide variety of system configurations such as AC, 3AC, 3NAC and DC.

In addition, the VMD461 is also equipped with an RS-485 interface, which means that it can be updated. At the same time, current measured values can be called up from anywhere in the world for remote parameter setting with the aid of the Bender gateway technology COMTRAXX® COM465-IP or the CP700 Condition Monitor.

Conclusion
In conjunction with the CD440 coupling device, the new VMD461 combines reliable operation with high flexibility and simple configuration for high nominal system voltages.

[1] ANSI codes: Functional description translated into a numerical code
(Source: ANSI /IEEE Standard C37.2 Standard for Electrical Power System Device Function Numbers, Acronyms, and Contact Designations)