Power and Transformer Stations

Operating power stations safely – Low voltage Control circuits

High availability requires a reliable supply

Control voltage circuit

Low voltage controls must be monitored for electrical safety 24/7. After all, an electrical fault will pose a significant risk in terms of downtime and can become a potential fire hazard. At the same time, sudden service intervention can be expensive and time consuming. For this reason, insurance bodies often request condition monitoring systems from their clients. Such a system, like the Bender ground fault monitoring and detection unit will provide a clear overview of the plants electrical health and provide all the relevant data needed for supervision and maintenance. 

Product overview ISOMETER®
Product overview Residual current monitoring
Product overview Power Quality
Flyer Power Quality
Application Note EDS309x
Technical paper Insulation fault location - Planning and set up in the solar charging station at the University of Applied Sciences Bingen
Technical paper Electrical safety in control and auxiliary circuits
Technical paper Where residual current technology meets the IT system

Recommended systems for ground-fault detection (ungrounded systems):

Recommended systems for ground-fault location:

Recommended systems for ground-fault monitoring (grounded systems):

Recommended systems for permanent monitoring:

DIN VDE 0100-731
Errichten von Niederspannungsanlagen - Teil 7-731: Anforderungen für Betriebsstätten, Räume und Anlagen besonderer Art – Abgeschlossene elektrische Betriebsstätten 

Off line monitoring for stand by equipment

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De-energized loads

Continuous ground-fault monitoring of de-energized loads plays a decisive role in damage prevention. Crane systems, fire extinguisher pumps, pusher drives, etc. are often only used occasionally or in an emergency - but that is exactly when they need to work flawlessly. Bender offline ISOMETER®s permanently monitor de-energized systems, reporting ground faults early and thus providing perfect protection against critical situations. 

Flyer Offline Monitoring

Recommended systems for ground-fault detection (ungrounded systems):

EN 61557-8
Electrical safety in low voltage distribution systems up to 1 000 v a.c. and 1 500 v d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 8: Insulation monitoring devices for IT Systems

EN 61557-9
Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 9: Equipment for insulation fault location in IT Systems

EN 61557-15
Electrical safety in low voltage distribution systems up to 1000 V ac and 1500 V dc - Equipment for testing, measuring or monitoring of protective measures - Part 15: Functional safety requirements for insulation monitoring devices in IT systems and equipment for insulation fault location in IT systems

Voltage monitoring in three phase power systems

VMD258

The VMD258 analog voltage relay monitors three phase AC systems for under and over voltages (window function) It’s internals are based on analog technology and omit the use of a microprocessor, which makes this relay suitable for nuclear and some demanding military applications. The auxiliary voltage supply can be derived from the system to be monitored. Both, system and supply are separated by a dual layer of insulation for additional internal safety and reliability. Special filter chokes dampen potential electronic noise stemming from the monitored power system. The response values for under and overvoltage and also for time response delays can be adjusted to varying levels.

Product overview Power Quality

Recommended measuring and monitoring relays:

DIN EN 60255-1 VDE 0435-300
Measuring relays and protection equipment - Part 1: Common requirements

DIN EN 60255-127 VDE 0435-3127
Measuring relays and protection equipment - Part 127: Functional requirements for over/under voltage protection