Datasheet

2 TDB301021en/06.2013
Product description
The VMD460 is an external network and system protection (NS protection) the purpose
of which is to disconnect the power generation system from the grid by coupling switches
in the event of inadmissible threshold values. If voltage and frequency measurements on
the power generation system are outside the thresholds required in the standards, the
relays of the VMD460 will switch. The VMD460 is multifunctionally adjustable. The currently
measured values are continuously shown on the LC display. The measured values leading
to the tripping of the relays are stored.
Typical applications
• Automatic switching point between a power generation system operated in parallel
with the network and the public grid
• Application in accordance with CEI 0-21, VDE-AR-N 4105, BDEW guideline,
C10/11, G59/2, G83/2, DIN V VDE V 0126-1-1
• Universally applicable for safe mains decoupling of power generation systems
Description of function
Reconnection to the grid will only be carried out when the national conditions for connection
to the grid are met. Here, both the mains voltage and the mains frequency must be within
the tolerance range defined in each case.
The VMD460 features several separately adjustable measuring channels for
• Voltage drop protection U <
• Voltage drop protection U<<
• Rise-involtage protection U >>
• Rise-in-voltage protection U10 > (10-minute average value)
• Frequency increase protection f>
• Frequency decrease protection f<
This satisfies the requirements for static and dynamic network monitoring.
In case of limit infringements or a remote trip signal, the relays K1, and where appropriate K2,
switch and the alarm LEDs light. Reconnection to the grid is carried out when the national
conditions for connection to the grid are met. A test button “T” which when operated activates
the relays and ensures that the required test (trigger test) for the purpose of checking the
relays K1 and K2 is carried out.
Certificate of non-objection/certificates of conformity
• CEI O-21
• VDE-AR-N 4105
• BDEW guideline
• C10/11
• G59/2 in preparation
• G83/2 in preparation
• DIN V VDE V 0126-1-1 in preparation
LINETRAXX® VMD460-NA
Network and system protection (NS protection)
for monitoring the power feed-in of power generation systems
LINETRAXX® VMD460
Device features
• Straightforward commissioning due to
pre-set basic programs for national
standards and regulations
• Single-fault tolerance
• Monitoring of the connected coupling
switch (configurable: NC/NO/off)
• Islanding detection df/dt (ROCOF)
• Interface RS-485 (software update)
• Test function for the determination of
the disconnection time
• Test button for the trigger circuit
• The last 300 distribution network faults can
be recalled with time stamp/real-time clock
• Continuous monitoring of the phase and
line-to-line voltage
• Separate switching conditions after a
threshold infringement
• Language selection
(German, English, Italian)
• Backlit graphics LC display
• Password protection for device setting
• Remote shutdown via ripple control
signal receiver
• Sealable enclosure