EFR4001IP
12720-0713-00
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7.9 Program 5 (zero export / import added together, prevent/ limit infeed)
Precondition:
•
Own generating unit, e.g.
photovoltaic, CHP, wind rotor, water turbine, …
•
Regulatory requirements from the grid operator for limitation or prevention of energy flow
accumulated
over all 3 phases.
Goals:
•
Prevent grid-infeed of mixed- or non-self-generated energy.
•
Charging of batteries only in case of excess power and discharge during delivery (=import= draw)
only.
•
Prevent or limit feed in of energy
•
If necessary, switch on consumers before the generating unit has to be limited or shut down.
Measurement:
•
The EFR4001IP monitors the accumulated flow of energy at the grid connection point.
(Import (purchase) from or export (delivery) to the public power grid)
•
The EFR4001IP monitors the flow of energy in front of batteries directly.
(Prevent energy flow in inadmissible direction)
Feature:
•
The actual measured active power P L123 (accumulated) is evaluated at the point of measurement.
•
The monitoring function is determined separately for each alarm/relay via the set limit values
MAX monitoring: Power Kx off > Power Kx on;
MIN monitoring: Power Kx off < Power Kx on.
•
Fixed function of relay: alarm = relay off = contact x1-x4 open, contact x1-x2 closed.
•
Storage of shut down (autoreset on = switched off), reset at device or disconnect Us.
•
The three relay outputs (alarms) work independently of each other.
•
Delay-OFF times can be set from 0 s (= reaction time <500 ms).
Switch-off MAX monitoring:
•
If the power P L123 rises above the limit Kx off, the delay-OFF time starts to count. If the power stays
above the limit for this delay-OFF time, the relay Kx switches off.
•
Reconnection: If the power P L123 falls under the limit Kx on, the set delay-ON time starts to count. If
the limit value remains undercut for the entire delay-ON time, the relay Kx switches on (after reset only
when auto Reset Kx = off).
Switch-off MIN monitoring:
•
If the power P L123 falls below the limit Kx off, the delay-OFF time starts to count. If the power stays
below the limit for this delay-OFF time, the relay Kx switches off.
•
Reconnection: If the power P L123 rises above the limit Kx on, the set delay-ON time starts to count. If
the limit value remains exceeded for the entire delay-ON time, the relay Kx switches on (after reset
only when auto Reset Kx = off).
Examples:
•
Limitation of grid-infeed:
Own-generating unit produces more power than permissible at the grid-connection point:
EFR4001IP switches on 1 or 2 consumers. If this is not sufficient, the generation is reduced or
switched off.
•
Zero-grid-infeed: It is not allowed to feed into the grid.
EFR4001IP switches on 1 or 2 consumers. If this is not sufficient, the generation is reduced or
switched off.
•
Storage without import:
EFR4001IP shuts down the unit, in case of power flow in inadmissible direction (to battery).
•
Storage without delivery to grid (zero export):
EFR4001IP shuts down the unit, in case of power flow in inadmissible direction (to grid).
•
Connection of adjustable consumer at the analogue output:
The EFR4001IP regulates energy flow to a programmable value. Shut down only when power of
consumer reaches maximum and energy flow cannot be limited sufficiently.
