ABB RELION 630 Series Product Manual page 16

Power Management
PML630/Compact Load-Shedding Solution
Product version: 1.2.1
protection relays are configured to send the active power
and the circuit breaker status information.
• In case of RIO600 units that are associated with the power
source, network circuit breakers and load feeders, the
active power information passes through a power
transducer as 4-20mA output and the RTD input module
channel. The circuit breaker status is acquired through
auxiliary relays like ABB RXMA1/2 and the binary input
DIM8 module channels as two single-point inputs.
• RIO600 is configured to send the aforesaid information.
• The circuit breaker single-point status information are
converted into double-point information in PML630.
• COM600S or COM600F, through its IEC 61850 proxy
server, is configured to send the manual load-shedding
priority and power information.
The binary data sets comprising the circuit breaker status and
the digital input information are configured to be sent
instantaneously over GOOSE with the lowest possible minimum
time. Thus, the GOOSE message reaches the recipient PML630
device in the sending direction and the load feeder protection
relays in the receiving direction typically in 10 ms.
Analog data sets comprising information such as active power
and currents need to be configured with identical minimum and
maximum times by emulating a cyclic behavior of transducer.
Configuring faster analog signals can prove detrimental to the
performance of the communication network.
Load-shedding command information sent from PML630 to the
load feeder protection relay or the feeder IO unit is validated
before released to trip the circuit breaker.
The validation checks include certain factors.
• IEC 61850 data validity from PML630
• Communication validity with PML630
• PML630 device test mode validity (that it is not in the test
mode)
• Load feeder protection relay test mode validity (that it is
not in the test mode)
The RIO600 IO unit's SCM module's high-speed, power
outputs can be used to directly trip the load feeder's circuit
breaker. Operating time of these outputs is <1 ms. Whereas,
the RIO600 IO unit's DOM module channels do not have the
capacity to be wired in the trip circuit and therefore, additional
high capacity, fast-acting interposing relays like ABB RXMA1/2
need to be deployed to trip the load feeder circuit breaker.
IEC 61850 MMS communication
The load-shedding operational data sent to COM600 is
displayed in the dedicated subnetwork and the single line
displays standard alarm or the event lists. PML630 also
receives the load-shedding control actions, manual load-
shedding command and load-shedding reset commands from
COM600S or COM600F.
16
PML630 sends the load-shedding operational data to
COM600.
For six generators and two grid tie or grid transformers
• Measurement information
– Available power
– Active power
– Available power on percentage of the active power
– Actual demand
– Maximum demand value above which demand-based
load-shedding is started
– Overload amount
– Maximum power with the slow load-shedding trigger
– Maximum current of the three-phase inputs
– Elapsed time of the overcurrent-based slow load-
shedding
– Maximum current setting for overcurrent-based slow
load-shedding
– Total time after which current-based slow load-
shedding trigger generated
– Actual calculated demand energy of source
– Must be load-shed power from adjacent network area
through the grid 1 or grid 2 feeder (load-shedding
sharing)
– Spinning reserve power from the adjacent network area
through the grid 1 or grid 2 feeder
• Status information
– Fast load-shedding start
– Fast load-shedding operation
– Overcurrent-based slow load-shedding start
– Overcurrent-based slow load-shedding operate
– Circuit breaker position (open or closed)
– Single or multiple basic function setting changes
– Load-shedding blocking is bypassed for power source
– Slow load-shedding mode information (overcurrent or
maximum demand or overcurrent & maximum demand
or disabled)
– Slow load-shedding trigger inhibited or disabled for
power source
– Load-shedding blocked due to the power source
– Generator governor mode information
– Load-shedding trigger inhibited or disabled from the
power source
– Load-shedding triggered from the power source
– Overcurrent-based slow load-shedding reset
– Maximum demand operation alarm
– Maximum demand reset
– Subnetwork number
For six busbars
• Measurement data
– Total active power from the sheddable loads (1...10)
– Load-shedding trip command for the sheddable loads
(1...10)
• Status information
1MRS757334 E
ABB