EFR4001IP
12720-0713-00
Page
24 / 53
www.ziehl.de
7.12
Program 8 (Pav,e-monitoring user defined
→ Relay K3, zero export / import added together
→ Relay K1 & K2)
Precondition:
•
Own generating unit, e.g. photovoltaic, CHP, wind rotor, water turbine, …
•
Relay K1 & K2:
Regulatory requirements from the grid operator for limitation or prevention of energy
flow
accumulated
over all 3 phases.
•
Relay K3:
The maximum feed-in power
Pav,e
specified by the grid operator to be monitored.
Goals:
Relay K1 & K2:
•
Prevent grid-infeed of mixed- or non-self-generated energy.
•
Prevent or limit feed in of energy.
•
If necessary, switch on consumers before the generating unit must be limited or shut down.
Relay K3:
•
Pav,e-monitoring and feed-in limitation.
•
The following power quotient applies to Pav,e-monitoring:
𝑃
𝑎𝑣,𝑒
𝑃
𝑖𝑛𝑠𝑡,𝑚𝑎𝑥
= 𝑞 ⇔ 𝑃
𝑎𝑣,𝑒
= 𝑞 ∙ 𝑃
𝑖𝑛𝑠𝑡,𝑚𝑎𝑥
⇔ 𝑃
𝑖𝑛𝑠𝑡,𝑚𝑎𝑥
=
1
𝑞
∙ 𝑃
𝑎𝑣,𝑒
(The power quotient q is freely definable when Pav,e and Pinst,max are entered. The switching points
S1, S2 and S3 (as well as factor1(q), factor2(q) and factor3(q)) depend on the entered Pav,e and
Pinst,max)
•
Frequency rejection
→ Pav,e-monitoring inactive when f < 49,8 Hz or f > 50,2 Hz.
Measurement:
Relay K1 & K2:
•
The EFR4001IP monitors the accumulated flow of energy at the grid connection point
(import (purchase) from or export (delivery) to the public power grid)
Relay K3:
•
The EFR4001IP monitors the accumulated flow of energy at the grid connection point and thus
compliance with the feed-in power Pav,e specified by the grid operator.
Feature:
•
The actual active power P L123 (accumulated) is evaluated at the measurement point.
•
The monitoring function is determined separately for each alarm/relay by setting of the limit values:
Relay K1 & K2:
MAX monitoring: Power Kx off > Power Kx on
MIN monitoring: Power Kx off < Power Kx on
Relay K3:
Pav,e-monitoring:
Relay K3 switches off, when
the measured active power P L123
≤
factor1(q)
*Pav,e (“the 1st switching point S1”) or
the measured active power P L123
≤
factor2(q)*Pav,e
(“the 2nd switching point S2”) or
the measured active power P L123
≤
factor3(q)
*Pav,e (“the 3rd switching point S3”).
Relay K3 switches on, when
the measured active power P L123
≥
0,98*Pav,e
(“power K3 on”).
With an active frequency rejection, relay K3 is always switched on when f < 49,8 Hz or f > 50,2 Hz
•
Fixed function of relay: alarm = relay off = contact x1-x4 open, contact x1-x2 closed.
•
Storage of shut down (switched off = autoreset on), reset at device or disconnect Us.
•
The three relay outputs (alarms) work independently of each other.
•
Delay-OFF time can be set from 0 s
