55
Relay status
Button pressing
Contractual
power limit
Swings of
network voltage
Remote control
command
Swings of network
voltage is out of limits
Contractual power
is exceeded
Relay connected
Relay disconnected
Ready for
reconnect
Ready for
reconnect
Relay connected
Button is pressed
Relay connected
remote disconnect
allow for reconnection
Network voltage is
within normal limits
Relay disconnected
Normal load
Figure 14-1 Algorithm of priority of internal main relays
14.1 Action “disconnect by remote control command”
Relay disconnection by remote command workflow:
1. Relay can be disconnected by sending “disconnect” command over any of these interfaces:
•
Optical interface (IEC 62056-21 and DLMS protocols) with password;
•
Electrical interface (DLMS) with password.
2. After receiving command “remote disconnect”, meter switches to internal state
“disconnected”: internal relay is open, relay state LED (see Figure 5-1) is on, corresponding
message (
Load
Load
Load
Load:oFF
:oFF
:oFF
:oFF
) is displayed on LCD and a source of disconnection is displayed in
OBIS code area (
....
....
....
....
). Entry is made to event register that “disconnect” request came from
optical interface if it was received from it, if command was sent from electrical interface –
entry is made accordingly;
3. Internal state can be changed from “disconnected” to “ready to connect” after “allow to
connect” command is received from source allowed by main relay control plan;
14.2 Action “disconnect by contractual power exceeded”
Relay disconnection by “contractual power exceeded” is based on such principles:
1. Meter measures average active power over period of integration Pav [W], as ratio of active
power A [Wh] over period of integration and duration of integration period ∆t:
2. When “contractual power exceeded” algorithm is enabled and average power of integration
period Pav [W] exceeds defined limit Plim [W], meter switches to internal state
“disconnected”: internal relay is opened, relay status LED (see Figure 5 -1) is on,
corresponding message (
Load:oFF
Load:oFF
Load:oFF
Load:oFF
) is displayed on LCD and a source of disconnection is
displayed in OBIS code area (
P-hi
P-hi
P-hi
P-hi
). Entry is made to event register that “disconnect”
request came from “contractual power exceeded” event;
3. Internal state can be changed from “disconnected” to “ready to connect” after “allow to
connect” command is received from source allowed by main relay control plan;
Summary of Contents for G1B Series
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