Under-voltage monitoring relay LINETRAXX® VMD42 series
over-voltagefrequencyphase sequence

under-voltage monitoring relay
under-voltage monitoring relay
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Characteristics

Measured/monitored value
under-voltage, over-voltage, frequency, phase sequence, phase unbalance, phase loss
Contact configuration
1 NO, 1 NC
Network
three-phase, AC
Other characteristics
digital, multifunction

Description

According to DIN V VDE V 0126-1-1, the voltage and frequency shall be monitored when feeding power into the public low voltage grid from private electricity generation systems > 30 kW (such as CHPs, wind power stations, hydroelectric power plants and photovoltaic systems). The three-phase VMD423 series voltage and frequency monitors monitor the voltage and frequency at the feeding point of the public grid. At the feeding point of the medium voltage grid, the output voltages and frequencies are measured by means of voltage transformers (100 V). An alarm relay is activated within ≤ 80 ms when limit values are reached (response values according to VDEW guideline “Private electricity generation systems at the medium voltage grid”). An overvoltage (> U2), measured as average value over a 10-minute period, will cause the alarm relay to switch. The voltages are measured as r.m.s. values. In addition asymmetry, phase failure and phase sequence are monitored.  The VMD423 is suitable for multifunctional monitoring tasks and can be adapted to the requirements of the electricity supply companies. The currently measured values are continuously shown on the LC display. The measured value causing the alarm relay to switch is saved. Due to adjustable start-up delay and delay on release, the network operator's specific requirements can be considered such as device-specific start-up procedures, short-time voltage fluctuations etc. The VMD423 series requires a separate supply voltage, whereas the VMD423H version draws its supplies from the system. • VMD423 with separate supply voltage • VMD423H is supplied by the system being monitored

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Meet this supplier at the following exhibition(s):

Hannover 2024
Hannover 2024

22-26 Apr 2024 Hannover (Germany) Hall 12 - Stand D62

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    *Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.