about silcovert s

1. Silcovert S™
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2. Silcovert S™
SILCOVERT S is a medium voltage load-commutated current source inverter (LCI) for
synchronous motors that provides speed regularity, monitoring and braking torque
regulation, V/Hz law shaping.
The flexibility of this product means that construction meets with the exact requirements of
the application. In 12 or 24 pulse configurations the SILCOVERT S gives precise power
control in applications requiring high power and/or speed ratings.
When necessary the same power converter can be used to brake the generator-turbine set,
regenerating the breaking power back into the network.
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3. Silcovert S™
Medium Voltage Drive
Supplied as a soft starter or an inverter (for
synchronous motors) the SILCOVERT S is
characterised by:
compact design;
 low weight;
 easy installation;
 minimum maintenance;
 high accuracy;
 air or water cooling system
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4. Silcovert S™
Medium Voltage Drive
Inverter Type:
LCI – Thyristor Technology
Main Supply Voltage
(3phase):
Air Cooling up to 4500 V
Water Cooling up to 11000 V
Input Frequency:
50/60 Hz ± 3%
Output Power:
65 MW
Output Voltage:
Air Cooling up to 4500 V
Water Cooling up to 10000 V
Output Frequency:
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5 up to 95Hz
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5. Motor Power vs Motor Current
MOTOR POWER vs CURRENT - VOLTAGE [2x]
PF = 0.9
90000
12000
80000
50000
6000
40000
30000
4000
20000
2000
10000
0
AIR
8000
Voltage [Vrsm]
Power [kW]
60000
WATER
10000
70000
0
1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500
Current [Arms]
Power [kW] V=4.16kV
Power [kW] V=6.6kV
Power [kW] V=10kV
4.16kV
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Power [kW] V=5.6kV
5.6kV
6.6kV
10kV
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6. Silcovert S™
Configuration
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12 pulse / 6 pulse
6 pulse / 6 pulse
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24 pulse / 12 pulse
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12 pulse / 12 pulse
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7. Silcovert S™
Forced Air
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8. Silcovert S™
Water Cooling System
External Water to Air Exchanger
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9. Silcovert S™
Water Cooling System
Internal Water to Water Exchanger
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10. Main System Components
Power Converter:
the rectifier and inverter
use as a standard a 6pulse three-phase
thyristors controlled bridge,
fitted in air-cooled or
de-ionized water-cooled
heat sinks.
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Thyristors:
The DC link reactor:
grouped in an array called a stack (4 – 8
thyristors), the number that are connected
in series is selected based on the
magnitude of the prospective peak
voltage.
Above is a typical 3-stacks 8-thyristors
power module. The stack auxiliary
devices include snubber capacitors &
resistors, firing board, firing high insulation
transformer.
decouples the line bridge
(rectifier) from the load
bridge (inverter). They
smooth and reduce the
ripple in the direct current
flowing in the intermediate
circuit between the rectifier
and the inverter bridges.
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11. Main System Components
Power Converter (Front)
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Power Converter (Rear)
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12. Cooling Systems
Air Cooling & Water Cooling
Air Cooling for power up to 10000 kW
The air is drawn into the cubicle by the converter fan and ejected from the top or carried out by means of air
ducts. Air forced cooling system it’s a very reliable way of cooling semiconductors devices, with minimal
maintenance costs. NIDEC ASI mounts a special device called anemometer on the top of the converter
panel, the converter is tripped if the fan is faulted or the air is not circulating.
Water Cooling for power above 10000 kW
De-ionized water is used to remove the heat from the thyristors and snubber resistors to a heat exchanger
(water-to-water or water-to-air). The converter’s primary cooling system is a closed-loop system with a
water tank. The de-ionized water circulates from the pump through the heat exchanger to the converter
bridge and returns to the pump. In most application also the DC link reactor is water-cooled. The water
cooling system is made up of the following components:
• Pump-motor group
• Tank
• Deionization system
• Conductivity measuring system
• Filter
• Exchanger
• Instruments
• Hydraulic Connections
• Cooling System Control
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13. Silcovert S™
40ft Container Mounting
DC Link Reactor
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Thyristor Power
Converter Front View
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Thyristor Power
Converter Rear View
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14. Silcovert S HMI
Instrumentation & Monitoring
The operator interface (SSDTERM)
enables the operator to perform quick and
efficient analysis on the digital regulator
status.
Display – makes up of the principal
electrical quantities (line and motor
current/voltage, speed set-point, speed
feedback, etc.), these same quantities are
also displayed as digital values.
Scope – is an oscilloscope function that
enables the real time display of selected
analog and digital variables.
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15. HMI
Control & Diagnostic Panels
Transformer and temperature monitoring
Visual display of the motor and transformers windings
temperature.
A traffic light for each motor and transformer displays the
status of protection (green means normal operation,
yellow – warning and red – trip).
Black Box: enables the operator to
examine the status of up to 8
variables (selected parameters)
before and after a certain event (ex.
Trip).
Contents can be saved as ASCII
file, and exported for further
examination
and
remote
transmission. (Also refer to the
Oscilloscope function)
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16. HMI
Control & Diagnostic Panels
Deionised cooling system – hydraulic circuit
It permits to display the motors status and the
numeric value of the water temperature, absolute and
differential pressure, conductivity, flow.
When the system is in local mode start/stop of
hydraulic pump is allowed from this page.
Thyristor Status Lay Out
The Lay -Out permits to display the Thyristor status
(green means status Ok, yellow means warning and
red means presence of trip).
Also the status (RUN,ALARM,TRIP) of the devices
(TC1,TC2, CONVERTER N.1, CONVERTER N.2,
MOTOR) is displayed.
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17. HMI
Control & Diagnostic Panels
Oscilloscope Function
Operator settings can be viewed through this function allowing a
visual assessment of drive functionality and status.
Event-Alarm - Trip Report
One of the most important functions of HMI systems is the alarm's
management recall.
The basic goals of this function are as follows:
1. Detect alarm conditions reported by basic automation PLCs
2. Notify any new alarm condition to the operators
3. Allow the operator to recognize (acknowledge) the new alarms.
The alarms' summary page shall allow following functions:
1. Presentation of alarms in form of list in chronological order.
2. Alarms are in different colours according to priorities.
All alarms are date and time summarised on the summary page.
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18. Silcovert S™
Principal Applications
 Starter for gas turbine generator
 Starter for hydro turbine generator
 Starter for synchronous compensator
 Starter for large synchronous motor
 VFD for synchronous motor up to 75 MW
 Marine propulsion VFD motor
 Gas compressor VFD motor
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