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1
、
Generator protection.
发电机保护
The
generators are protected against the various
faults by protection devices which
are
located in their respective generator panels and
on the generator’s ACB itself.
发电机的保护由相应发电机屏内保护设备与发电机主开关实现
。
1.1.
MICROLOGIC5.0A control module
MICROLOGIC5.0A
控制模块
This device
which is located on the individual generator ACB
provides
generator protection against
the following:
该装置在发电机主开关上<
/p>
,
为发电机提供以下保护
:
?
Over-current
(Long Time)
过电流（长延时）：
When the prevailing load current of the
generator exceed 125% of the protection
device’s setting and maintain for a
duration of 15
~30s, it will cause the
respective
generator ACB to trip.
当发电机电流超过额定电流
150%
时
,
延时
15~30s
发电机主开关跳闸。
?
Short-circuit
current (Short Time)
过电流
(
短延时
)
When short-circuit current exceed 2.5
times of the protection device setting and
maintain for duration of 40
0
msec, it will cause the respective generator’s ACB
to
trip.
当发电机电流超过额定电流
250%
时
,
延时
400 ms,
发电机主开关跳闸。
?
Short circuit
current (Instantaneous Trip)
短路电流
(
瞬时
)
When short-circuit current of the
generator exceed 10 times of the protection device
setting, it will cause the respective
generator ACB to trip immediately.
当发电机电流超过额定电流
10
倍时
,
发电机主开关瞬时跳闸。
Reverse power
relay
逆功率继电器
This
device is located in the individual generator
panel and built in PPU. During parallel
running when a DG start absorbing power
from other DG in exceeding a preset value (10% of
it’s rated power) of the it’s
protection device and if maintained for a duration
of 10s, the
generator’s ACB will be
tripped by the devi
ce.
该装置在发电机屏内，
当并联运行时一台发电机从其他发电机吸收功率持续超过某个值
（
10%
的额定功率）
10s
，发电机主开关跳闸
Undervoltage
release
欠压脱扣装置
This device which is located in the
generator’s ACB, providing protection against
undervoltage.
该装置在发电机主开关上
,
为发电机提供欠压保护
When the incoming voltage drop below a
value between 35% and 70% of the respective rated
voltage, this release device will trip
the ACB after a short period of time ranging from
about
0.3 sec to 0.5 sec. The short
time delay is to prevent the ACB from tripping in
the event of the
transient voltage dip.
当发电机的电压低于发电机额定电压
35%
与
70%
之间时
,
欠压脱扣装置延时
0.3 sec ~
0.5 sec
动作
,
发电机主开关跳闸。延时是为了避免电压瞬时波动
,
而导致发电机跳闸。
Preferential trip
relay
优先脱扣继电器
This
device which is located in the individual
generator pane and built in PPU, provides the
first stage of over-current protection
against a eventual tripping of the
generator’s ACB
during heavy load
condition. When the prevailing generator current
exceed the preset value
(100
% of generator’s rated
current) of the protection device and maintain for
a duration of
5s
or 10s, it
will trip the all the assigned non essential loads
thus preventing the load current
from
reaching the critical threshold value.
当发电机电流超过额定电流
100%
时
,
发电机屏内
PPU
中的优先脱扣
继电器动作
,
延时
5s
~10s,
将一些不重要负载切断
。
2
、
Alarm
monitoring, generator automatic control and power
management
system
报警监测，发电机自动控制与功率管理系统
:
General
structure
总体结构
The
typical processing pattern of the PLC as follows
PLC
典型处理方式如下
:
?
Acquisition of
digital and analog input signals make via the I/O
port of the PLC from the
various
sensors within and outside of the MSB.
通过
PLC
输入输出接口
,
对来自主配电板内外传感器上模拟量数字
量信号的采集
?
Acquisition
of information and instruction via the local
network.
局域网信息采集
?
Processing of
t
he user’s program.
用户程序处理
?
Changing and
updating of the outputs at the I/O output of the
PLC.
改变与更新
PLC
输出
System Architecture
系统结构
?
Black-out
processing function
全船失电处理功能
:
The Main PLC issues a engine start
signal to the DG defined within the
priority management function and couple
the DG to the main bus, thus
completing
the black-out processing function.
当一台在
网发电机发生故障
,
主开关跳闸
,
导致全船失电。
PLC
立刻发给另一台发电机起动
命令。当该发电机达到额定电压
85%,
主开关合闸。全船失电处理
功能完成。
?
Bus
abnormal processing function (with blackout)
汇流排异常处理功能（包括汇
流排失电）
:
The Main PLC initiates the
starting of the DG defined by the priority
management function. Upon voltage
build-up, a CB trip signal is issued
to
disconnect the duty DG and subsequently coupling
the running
standby DG to the main bus,
thus completing the bus abnormal
processing function.
当汇流排异常时
, PLC
立刻发给
另一台发电机起动命令。当该发电机达到额定电压
85%,
主<
/p>
开关合闸。
实施负载转移之后
,
发给故障发电机停止负载转移
,
主开
关分闸。汇流排异常处理功能完成。
?
Underload
detection and processing
function
轻载解列功能
:
This function is activated when two or
more DG are coupled to the bus.
When
the prevailing load of each DG drops below the
parameterized
percentage of it’s rated
capacity and for a duration in exceeding the
parameterized time, the DG to be taken
off from the main bus are
predefined by
the priority management function, will undergo the
process of load shifting, uncoupling
and engine stopping.
当两台或更多台发电机在网，如果每台发
电机的负载低于预先设定值，则
PLC
发出负载转
移命令，将其中一台发电机负载转移之后，该发电机主开关分闸，
发出停机命
令。
?
Large motor start request processing
function
重载问询功能
Whenever a large consumer initiates a
start request signal to the PMS,
the
Main PLC will check for available power. If the
available power is
sufficient to
provide for the large motor without exceeding 85%
of
coupled DG’s rated capacity, the
Main PLC will then issue a start
authorized signal back to the calling
consumer. Otherwise the Main
PLC will
initiate the startup, auto coupling and load
sharing sequence
of the next DG
predefined by the priority management function via
the
respective generator PLC.
Subsequently the Main PLC will computed
the available power to confirm it is
sufficient, before issuing the start
authorized signal to the calling
consumer.
In the event if no DGs are
available for the addition power requirement,
then the start authorized signal will
not be issued and calling consumer
will
be prevent from running until manual overriding by
operator.
当功率管理系统接收到重载询问信号时，
PLC
计算在网发电机剩余
有效功率。
如果剩余有效功率能满足大电动机起动
（未超过发电机
额定功率
85%
）
，
P
LC
发出重载起动认可信号。
如果剩余有效功率
不能满足大电动机起动，
PLC
先发出给予备用发电机
起机命令，
自
动并车，负载均分，最后
PLC
发出发出重载起动认可信号。
3
、
MSB operating
procedure
操作方式
3.1
Under Manu mode
手动模式
:
With single DG
running:
单台发电机运行
1.
Put the
control of the selected DG to remote control
possible to enable
the remote starting
of engine from the MSB.
发电机转到遥控
,
将主配电板同步屏
上发电机控制开关选择到起
动位置
,
发
电机起动。
2.
Once the DG speed has pickup, the
operator shall release the ENGINE
CONTROL switch letting it self-return
to the neutral position. The DG
should
run up to or close the rated speed. Simultaneously
the generator
output voltage should
reach the rated value.
一旦发电
机运转起来
,
放掉发电机控制开关手柄
,
开关将自动恢复
到断开位置。
<
/p>
发电机将以额定速度运转。同时
,
发电机
输出电压将
达到额定电压。
3.
The frequency
of the generator output voltage can now be
monitored
on the respective frequency
meter and if the value has deviated, the
operator can bring back to the rated
value by adjusting the DG speed
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