> The intellectualization changes the electrical
power distribution system synopsis
The electric power supply to society's production, the
work normally carries on has the count for much function. The
traditional low pressure power distribution control mode, mainly is
the low pressure switch control cabinet which through the circuit
breaker, the contact device, the thermal relay, the fuse, the control
relay, each kind of 主令 electric appliance, the mutual inductor and
each kind of electrician measuring appliance (ampere meter, voltmeter,
power table, electrical energy table and so on) the group synthesizes
realizes function and so on power distribution, control, protection,
surveillance. This traditional switch cabinet needs to have the
many kinds of simulations indicator measuring appliance and the relay;
For the production, the storage, the service brings enormously
inconvenient, and by the man-power direct operation primarily, is
unable to realize the computer intelligence management, realizes
regarding the more complex control logic quite is difficult.
Along with modern industry development, to electrical equipment
control automation and intellectualized degree request more and more
high, the use modern electronic technology, the sensor technology, the
communication technology, the computer and the network technology, in
is normal and the accident situation monitor the power equipment, the
protection, the control, the electric power measurement with factory
collection control system DCS, PLC, the enterprise resources plan
management fuses in together, achieved the high level, the high
transparency good management, has become one kind of inevitable trend
and the development direction. In the digitized time, INTERNET
is all the rage the whole world, also is changing the world. It
officially announced the digitized network time already approached.
This meant all movements and the management management way must
digitize, and must with the computer, the correspondence fuse.
From the end of the 80's to the beginning of the 90's, along
with the computer technology, the micro electron technology, the
electric power electronic technology, the antijamming technology and
so on the new technical rapid development, specially the network
communication technology development enabled the electric power
automation technology to obtain the unprecedented development.
Each big company starts these technologies to apply to the
electrical power distribution system, also is so-called the strong
electricity control and the micro electron technology, the computer
technology, the network communication technology unifies, thus was
born the intelligence switch cabinet and the correlation product, like
Germany siemens SIVACON series, English ALSTOM Corporation GALAXIS and
TRIMLINE series, ABB Corporation HONOR series and so on.
At present, the intelligence switch cabinet and the intelligence
electrical power distribution system already entered in our country
application from the start stage to the mature stage, in August, 2001
promulgated "the low pressure intelligence power distribution standard
draft" to play in particular the role which added fuel to the flames,
the intelligence switch cabinet revolutionary changed the traditional
switch cabinet concept; Has, the digitization multi-purpose, the
network, the intellectualization, the structure compact, is easy to
maintain and so on the characteristic, it will be allowed to satisfy
the electric power industry future the demand, will have the
prevention/to avoid the accident having, the strengthened enterprise
interior energy inspection, the reduction maintenance of equipment and
the overhaul time, realization data resources sharing and so on many
merits, has solid provided solid, the reliable foundation for business
unit's modern management, "an investment, the lifelong will profit",
truly guaranteed the user the investment benefit is not harmed.
The intelligence switch cabinet is in existing take simulates
the measuring appliance, the relay as the monitor, in the control
device ordinary switch cabinet foundation, with the new intelligent
measuring appliance (network electric power measuring appliance,
intelligent power distribution monitoring/protection module and so on,
network I/O) carries on the coordination, through its network
communication connection and master control room computer system
networking, thus may realize to respectively for power distribution
electrical parameter and so on return route voltage, electric current,
active power, reactive power, power factor, frequency, electricity
measure carries on the monitor as well as to the circuit breaker
analysis and synthesis condition, the breakdown information carries on
the surveillance, carries on the control to the circuit breaker
analysis and synthesis condition, coordinates each kind of perfect
long-distance monitoring software, Thus realizes "remotely
four":
* Telemetering: Real-time carries on the voltage, the
electric current, the active power, the reactive power, the power
factor, the frequency through the computer to the system
Leads and so on to carry on unceasing gathering, the
analysis, processing, the record, demonstrated the curve, the good
chart, automatically produce the report form.
* Remote letter: May real-time to switch quantity and so
on switch running status, protection movement carry on the
surveillance, the computer real time display sum
Auto-alarm, and to various cabinets in the switch
condition, the accident trips, has flowed fast, breaks, movement and
so on temperature carries on the real-time record, the printing.
* Remote control: Through the computer screen choice
corresponding station number, the switch number, gather/information
and so on minute floodgate, and is going to elect on the screen
Selects the switch condition feeds back, after confirmed
carries out, real-time recording operation time, type and switch
number and so on.
* 遥调: Uses in to establish each kind of intelligent
module the movement parameter, also the computer basis screen
operational order or the computer basis to the system analysis
judgement result, suppose the definite value and the fail safe value
to the intelligent module carries on long-distance 整定.
The intelligence electrical power distribution system is each
kind of intelligence switch cabinet and the computer supervisory
system combination application, generally by if the flour or the non-
intelligence low pressure switch cabinet composes through the
correspondence network joint intelligence. Its disposition may
according to the concrete project need, both may dispose helps the
intelligence component and the monitoring control unit switch cabinet,
and may dispose completely uses the traditional electric appliance
part and the monitoring control unit switch cabinet, simultaneously
also can mix the disposition. Selected to the user has provided
a bigger flexibility, satisfied the different level the need.
Low pressure switch cabinet monitor function specification:
The low pressure switch cabinet supervises the survey to adopt
obtains after CT or the 380V direct sampling after the computation.
Its specific request as follows:
1. regarding 380V power source 进线circuit breaker and 380V
section switch jail survey:
(1) supervises the survey: The three-phase current, the
switch cabinet planted agent disposes corresponding A, B, the C
additional current transformer. Regarding 380V power source
进线circuit breaker power distribution cabinet, but also must
monitor 380V (I) the section and (II) the section generatrix voltage.
The instrument uses the digital measuring appliance, the
precision is not lower than 0.5 level (four half).
(2) remote survey: Regarding the 380V power source
进线circuit breaker switch cabinet, must telemeter the three-phase
current, the active power, the reactive power, 380V (I) the section or
(II) the section generatrix voltage, voltage unbalancedness and the
electric current/voltage harmonic component (THD); To 380V
section switch cabinet, telemetering three-phase current. Its
three-phase current (or in trip three-phase CT) provides by additional
three-phase CT, the generatrix voltage directly withdraws by 380V.
Above bids business to be supposed to choose the corresponding
survey module to realize the remote survey monitor, bids when should
provide the survey module the pattern and the technology standard.
Survey module when introduction generatrix voltage, should be
equipped with the three-phase fuse protection.
2. regarding other 馈线circuit breaker cabinet (including
capacitor cabinet and street light 馈线cabinet), telemeters the
three-phase current,
The power factor, has the merit electrical energy;
Its three-phase current by additional three-phase CT (or in trip
three-phase CT)
Provides. No longer monitors the electric
quantity. The capacitor cabinet synthesizes the measuring
instrument to use the digital measuring appliance,
The precision is not lower than 0.5 (four half),
including three-phase current, three phase voltage, active power, idle
work
Power and power factor.
3. every remote surveys through RS485 serial mouth by main line
way communication to home station microcomputer supervisory system
integration cabinet.
4. 电度 measurements: In the street light 馈线power
supply return route, should act according to the street light power
supply the concrete wiring, disposition three-phase four has the merit
electric meter, and directly copies the table on the switch cabinet,
the electric meter no longer delivers to the microcomputer supervisory
system.
5. low pressure switches cabinet jail letter function
specification
On the low pressure switch cabinet should be equipped
with, the green light red, instructed the circuit breaker jumps,
合闸 the position signal below, and has the remote survey through
the RS485 serial mouth by the main line way communication to the home
station microcomputer supervisory system integration cabinet.
6. regarding the 380V power source 进线circuit breaker and the
380V section switch, its remote letter quantity includes:
(1) circuit breaker 合闸 position signal;
(2) the circuit breaker trips the position signal;
(3) circuit breaker/distant place control cut switch "far
position" signal;
(4) the circuit breaker control power source vanishes and the
control loop broken line signal;
(5) does the circuit breaker trip trip the accident total signal
(including trip why originally thus 脱扣, if because short-circuits
short time delay protection, short-circuits long time delay
protection, short-circuits 瞬动 protection movement and so on but
脱扣, trip microprocessor breakdown and so on);
(6) emergency power supply automatic investment installment
movement signal.
7. (by models shell circuit breaker and contact device
constitution) regarding the 380V capacitor cabinet, its remote letter
quantity includes:
(1) the condenser bank throws the group number signal which
cuts, namely the contact device gathers the position signal which,
breaks;
(2) the contact device control power source vanishes and the
control loop broken line signal;
(3) circuit breaker 合闸 position signal;
(4) the circuit breaker trips the alarm (for this, circuit
breaker should install reports to the police secondary contact);
(5) trip microprocessor breakdown signal.
8. (by models shell circuit breaker and contact device
constitution) regarding the street light 馈线return route, its
remote letter quantity includes:
(1) the street light throws cuts the signal, namely the contact
device gathers the position signal which, breaks;
(2) the contact device control power source vanishes and the
control loop broken line signal;
(3) circuit breaker 合闸 position signal;
(4) the circuit breaker trips the alarm (for this, circuit
breaker should install reports to the police secondary contact);
(5) trip microprocessor breakdown signal.
9. regarding other 380V 馈线return route, its remote letter
quantity includes:
(1) circuit breaker 合闸 position signal;
(2) the circuit breaker trips the alarm (for this, circuit
breaker should install reports to the police secondary contact);
(3) regarding installs the earth fault protection the circuit
breaker, should be equipped with the earth fault protection movement
signal (signal to draw out way to be possible to determine according
to earth fault protection plan);
(4) trip microprocessor breakdown signal.
9. low pressure switches cabinet communication function
specification
According to function specification and so on the
circuit breaker remote control, telemetering, remote letter, each
circuit breaker should provide the communication module, and by the
main line way with this 配电?monitoring integration cabinet by
the RS485 serial mouth connection way correspondence, on the 380V
switch cabinet module and communication protocol between the
monitoring integration cabinet ought to be able to satisfy MODBUS the
RTU terms of an agreement. |
