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Load sharing Unit

Được đăng lên bởi Vinh Vũ Văn
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ANSI code 90

var load sharing units
uni-line

Type LSU-122DG

4921240124F

•

For control of diesel or gas generators

•

Built-in reactive power transducer

•

Control of AVR

•

LED indication of status

•

LED indication for activated control

•

35 mm DIN rail or base mounting

Application
The LSU-122DG is a control unit for control of the
generator in a power unit.
The LSU-122DG can control the power unit
- in stand alone mode, performing voltage control
- parallel with grid, performing reactive power control
- parallel with other power units, performing voltage and
reactive power control
The unit is designed for connection to a motor
potentiometer for control of the AVR, however in
conjunction with the DEIF electronic potentiometer type
EPN-110DN or EPQ-96 it can control most electronic
AVRs.
All the LSU-122DGs in the power plant must be
connected to a common voltage transducer. If a number
of generators are to be synchronised to the busbar at
the same time, the voltage may likewise be controlled
externally.

Function
The LSU-122DG is measuring the voltage and the
current from which the reactive power produced by the
power unit is calculated. The built-in reactive power
transducer is based on an I x sin phi principle.

DEIF A/S

The following couplings are available:
- 1var single phase
- 1var3 1 element, 3 phase 3 wire balanced load
If unbalanced load can be expected an external reactive
power transducer with an output of 4…20mA can be
connected to the LSU-122DG. In this case the built-in I
x sin phi transducer is automatically interrupted.
The reactive power measured by each LSU-122DG is
fed to a common line for comparison with the reactive
power (QS) of the other connected LSU-122DG. The
voltage line (US) from each LSU-122DG is connected to
the common voltage transducer.
If L1 or L2 is disconnected from the LSU-122DG at the
same time as a power unit in a power plant is
disconnected from the power line (busbar), built-in
relays in the LSU-122DG ensure that the reactive power
output (QS) and the voltage input (US) of the
associated unit are disconnected from the paralleling
lines. Likewise the reactive power and voltage lines are
disconnected, if the auxiliary voltage to the LSU-122DG
is disconnected.

LSU-122DG

The LSU-122DG is equipped with an unload input.
When activated this input will control the power unit
(generator) to zero reactive power, and at the same
time the reactive power output of the LSU-122DG is
disconnected from the paralleling ...
DEI
F
A/S
Application
The LSU-122DG is a control unit for control of the
generator in a power unit.
The LSU-122DG can control the power unit
- in stand alone mode, performing voltage control
- parallel with grid, performing reactive power control
- parallel with other power units, performing voltage and
reactive power control
The unit is designed for connection to a motor
potentiometer for control of the AVR, however in
conjunction with the DEIF electronic potentiometer type
EPN-110DN or EPQ-96 it can control most electronic
AVRs.
All the LSU-122DGs in the power plant must be
connected to a common voltage transducer. If a number
of generators are to be synchronised to the busbar at
the same time, the voltage may likewise be controlled
externally.
Function
The LSU-122DG is measuring the voltage and the
current from which the reactive power produced by the
power unit is calculated. The built-in reactive power
transducer is based on an I x sin phi principle.
The following couplings are available:
- 1var single phase
- 1var3 1 element, 3 phase 3 wire balanced load
If unbalanced load can be expected an external reactive
power transducer with an output of 4…20mA can be
connected to the LSU-122DG. In this case the built-in I
x sin phi transducer is automatically interrupted.
The reactive power measured by each LSU-122DG is
fed to a common line for comparison with the reactive
power (QS) of the other connected LSU-122DG. The
voltage line (US) from each LSU-122DG is connected to
the common voltage transducer.
If L1 or L2 is disconnected from the LSU-122DG at the
same time as a power unit in a power plant is
disconnected from the power line (busbar), built-in
relays in the LSU-122DG ensure that the reactive power
output (QS) and the voltage input (US) of the
associated unit are disconnected from the paralleling
lines. Likewise the reactive power and voltage lines are
disconnected, if the auxiliary voltage to the LSU-122DG
is disconnected.
The LSU-122DG is equipped with an unload input.
When activated this input will control the power unit
(generator) to zero reactive power, and at the same
time the reactive power output of the LSU-122DG is
disconnected from the paralleling line.
The calibration of the LSU-122DG is done so it
matches its power unit. This means that load sharing
between power units with different size will be
performed according to the actual size of the individual
power units in the plant. E.g. a 100kVA generator and
a 150kVA generator running in parallel will share a total
load of 125kvar into 50kvar and 75kvar.
Regulator output
The unit is provided with 2 contact outputs for voltage
control:
Reactive power and voltage control:
The regulating speed of the motor potentiometer for the
AVR is controlled by the built-in P controller of the
LSU-122DG according to its setting for:
T
N
(pulse length):
The min. duration of the control pulse.
X
P
(proportional band):
The zone within which the pulse ratio changes
proportionally to the voltage/reactive power deviation
from the required value.
Dead band:
The zone within which no control pulses are emitted:
Power: ±0.5% of P
n
Voltage: ±1% of U
n
Self-monitoring
The LSU-122DG is equipped with a self-monitoring
function. The function supervises the built-in micro-
controller and hereby verifies if the programme is
running correctly. The green LED marked “POWER” is
connected to this function. Constant green light
indicates that the supply voltage is accepted and the
unit is running correctly. Flashing green light 2-3Hz
indicates that the supply voltage is accepted but the
unit is running incorrectly. In this situation the status
output terminals 17 and 18 are activated (open).
A
NSI code 90 var load sharing units
Type LSU-122DG uni-line
4921240124F
For control of diesel or gas generators
Built-in reactive power transducer
Control of AVR
LED indication of status
LED indication for activated control
35 mm DIN rail or base mountin
g
LSU-122DG
Load sharing Unit - Trang 2
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4 Vietnamese
Load sharing Unit 9 10 694