dc ups training course
TRANSCRIPT
-
8/7/2019 DC UPS Training Course
1/47
ALFANAR TRANNING CENTER
DC / UPS Training Course
O b 2010ctober 2010
110/14/2010
-
8/7/2019 DC UPS Training Course
2/47
ALFANAR TRANNING CENTER
SHAROURAH POWER PLANT EXTENSION PROJECT
NAME: Mohamed Ibrahim
210/14/2010
-
8/7/2019 DC UPS Training Course
3/47
Presentation of DC System
Introduction
electronic equipments, automation systems and telecommunication anddata systems existing in modern power plants.
supply voltages that have to be generated from the mains as well as
from a battery-assisted d.c voltage. These E ui ments could be su lied from AC or DC sources.Battery/Rectifier
Accordingly, means should be developed to generate AC voltages from
battery backed d.c. voltages to ensure continues supply to these loads
in case of AC power failure from the mains. Inverter
To ensure quality of AC voltage supplied to the loads, automatic voltageregulator is used. Constant Voltage Transformer (CVT)
310/14/2010
-
8/7/2019 DC UPS Training Course
4/47
Presentation of DC System
Principle of Operation
The main target is to provide an uninterruptible power supply to critical
an oa s.
AC voltage from unit auxiliary supply is rectified to DC voltage. This
rectified AC is provided with a back-up battery system to supply the DC
.
DC voltage from the main DC bus bar is converted to AC voltage
through Inverter to provide AC loads.
410/14/2010
-
8/7/2019 DC UPS Training Course
5/47
Main AC Supply
RectifiersCVT
Battery
Main
DCPanel
Inverter
Dist.
PanelAC UPS
Panel
510/14/2010
-
8/7/2019 DC UPS Training Course
6/47
Modes of Operation
Normal Mode of Operation
The AC main supply is healthy.
The two rectifiers are sharing the total DC load. Battery is in floating status (rectifiers are supplying the battery internal
.
AC loads are supplied from DC main bus bar through inverter .
610/14/2010
-
8/7/2019 DC UPS Training Course
7/47
Modes of Operation
Failure/Maintenance of The Inverter
The AC main supply is healthy.
Battery is in floating status (the healthy rectifier is supplying the battery The two rectifiers are sharing the total DC load.
.
AC loads are supplied from AC main supply through CVT.
710/14/2010
-
8/7/2019 DC UPS Training Course
8/47
Modes of Operation
Failure/Maintenance of One Rectifier
The AC main supply is healthy.
Only one rectifier is supplying the whole DC loads. Battery is in floating status (the healthy rectifier is supplying the battery
.
AC loads are supplied from DC main busbar through inverter .
810/14/2010
-
8/7/2019 DC UPS Training Course
9/47
Modes of Operation
Failure of Both Rectifiers
The AC main supply is healthy.
Both rectifiers are out of service. The battery is supplying the whole DC loads.
AC loads are supplied from AC main supply through CVT.
OFF
910/14/2010
-
8/7/2019 DC UPS Training Course
10/47
Modes of Operation
Failure of AC Main Supply
The AC main supply is out of service.
Both rectifiers are out of service.
The battery is supplying the whole DC load.
AC loads are supplied from DC main bus bar through inverter.
1010/14/2010
-
8/7/2019 DC UPS Training Course
11/47
Modes of Operation
Restoration of AC Main Supply
The AC main supply is Healthy.
Both rectifiers are sharing the DC loads and charging the battery.
The battery is in the charging status.
AC loads are supplied from DC bus bar through inverter.
1110/14/2010
-
8/7/2019 DC UPS Training Course
12/47
Presentation of DC/AC Inverter
Inverter Principle of Operation
In one simple inverter circuit, DC power is connected to a load through a
c rcu w rans s or sw c es an an -para e o es. e rans s or
switches is rapidly switched back and forth to allow current to flow backto the DC source following two alternate paths through one end of the
load and then the other. The s uare wave form obtained can be filtered
to obtain pure sine wave form.
1210/14/2010
-
8/7/2019 DC UPS Training Course
13/47
Inverter Operation Modes
Continuous Mode
The AC loads are supplied from the DC source through the inverter.
Change over to AC mains without interruption within 2.5 ms if theinverter output voltage deviates from the nominal by more than 10%.
The loads will be switched back from the AC mains to the inverter
output after 30 sec when the inverter output voltage is again within limits
AC Mains
AC Output
DC Source
1310/14/2010
-
8/7/2019 DC UPS Training Course
14/47
Inverter Operation Modes
Standby Mode
The AC loads are supplied from the AC mains during normal operation.
The inverter remains switched on and kept synchronized to the AC
mains and operates with no load.
When the AC mains voltage goes out of limits the load is transferred to
the inverter output within 12 ms.
The loads are switched back to the AC mains automatically when the
voltage is within limits again.
AC Mains
AC Output
DC Source
1410/14/2010
-
8/7/2019 DC UPS Training Course
15/47
Inverter Panels
Manual Bypass
bypass switch so that the inverter and the
electronic AC mains changeover switch can
be isolated for maintenance purposes.
The manual changeover withoutinterruption can take place only when
the AC mains and the inverter outputs
are synchronized and within limits.
1510/14/2010
-
8/7/2019 DC UPS Training Course
16/47
Inverter Panels
Measuring Devices
1610/14/2010
-
8/7/2019 DC UPS Training Course
17/47
Inverter Panels
Indication Leds
H8
H1 H6
H9
H2 H5 H7
Umains>Unom-10%
H2
H5
DC voltage within limits
Uinv > Unom-10%
H7 ma ns sw tc Inverter switch
H8 Bypass switch
H9 Automatic switch
1710/14/2010
-
8/7/2019 DC UPS Training Course
18/47
Inverter Maintenance
The inverter equipment requires very little maintenance.
Prevent dust from accumulating in the inverter equipment.
Clean the inverter equipment with nothing more than an insulated brush
and a vacuum cleaner if that should become necessary.
If fuses blow, replace them only with fuses of the same type and value.
ec e nom na va ues o vo age an requency very occas ona y.
The fan in the power semiconductor cooling system should be replaced
every 4 years.
1810/14/2010
-
8/7/2019 DC UPS Training Course
19/47
Presentation of Charger
Rectifier Principle of Operation
The Three phases input voltage 400Vac supply the Full Bridge constituted
of 6 th ristors V1 to V6 throu h the in ut transformer T1.
The AC incoming lines can be interrupted with the internal CB Q001. The DC voltage coming from the bridge is filtered by the cells L1-C10 to
.
The pulses to order the thyristor blocks are provided by electronic card A1
(Thyristor Regulator Card).
1910/14/2010
-
8/7/2019 DC UPS Training Course
20/47
Charger Operation Modes
Floating Charging
The Charger is keeping the battery in the floating status with a defined set
voltage per cell.
the DC loads connected to the DC panels.
2010/14/2010
-
8/7/2019 DC UPS Training Course
21/47
Charger Operation Modes
Boost Charging
The boost mode starts automatically after a battery discharge (in case of ac
power failure).
The boost voltage value is adjusted to 138 v.
The charger will switch over automatically to the floating mode (normal
operation) after the set delay time.
The boost mode can be started also manually through the menu present inthe front LCD display.
2110/14/2010
-
8/7/2019 DC UPS Training Course
22/47
Charger Operation Modes
Equalizing Charging
se on y or t e comm ss on ng c arge o t e vente sea e ea ac or
NiCd battery types to form the battery cells. Equalizing charge level consists of high DC voltage 144V with limited
.
Equalizing charge must be used without load, only the battery bank is
connected to the DC charger.
E ualizin char e starts manuall from the menu resent in the LCD dis la .
2210/14/2010
-
8/7/2019 DC UPS Training Course
23/47
Charger Panels
LCD Operating Panel
DC Output
Volta e
Indication
Leds
NavigationButtons
2310/14/2010
-
8/7/2019 DC UPS Training Course
24/47
Rectifier Maintenance
The unit does not need to be maintained, however, check the following:
The screws, if all the mechanical parts are rightly fixed.
Check the floating voltage and adjust, if necessary, through the menus
presents on the LCD display. Disconnect the battery before setting.
Check the boost voltage and adjust, if necessary, through the menus
presents on the LCD display. Disconnect the battery before setting.
Dust the unit every year.
Replace the thyristor bridge fan every 5 years.
years.
2410/14/2010
-
8/7/2019 DC UPS Training Course
25/47
Presentation of Battery
Battery Concept
A battery is a device in which chemical energy is directly converted to
electrical energy .
It consists of one or more voltaic cells, each of which is com osed of two
half cells (electrode) connected in series by the conductive electrolyte.
The electrolyte is a conductor which connects the electrodes together and
also contains ions which can react with chemicals of the electrodes.
Half Cell
2510/14/2010
-
8/7/2019 DC UPS Training Course
26/47
Presentation of Battery
Battery Concept
Chemical energy is converted into electrical energy by chemical reactions that
transfer charge between the electrode and the electrolyte at their interface.
materials (lead plate and lead-dioxide plate) placed in an electrolyte (sulfuric
acid).
nce e vo age o a a ery s re a ve y cons an , e capac y o a a ery o
store energy is often expressed in terms of the total amount of charge able to
pass through the device Ampere Hours
2610/14/2010
-
8/7/2019 DC UPS Training Course
27/47
Presentation of Battery
Lead Acid Battery
e ea -ac ce cons sts o a meta c ea ano e an a ea ox e
cathode, which are immersed in a dilute sulfuric acid solution (H2SO4).
During discharge, the lead dioxide (positive plate) and lead (negative plate)
react with the electrolyte of sulfuric acid to create lead sulfate, water and
energy.
2710/14/2010
-
8/7/2019 DC UPS Training Course
28/47
-
8/7/2019 DC UPS Training Course
29/47
Presentation of Battery
Lead Acid Cell Construction Vent Plug
Release as in case of
excess pressure and
protect the cell fromatmosphere
Screw connection for easyand safe connection.
Separators
Special micro porous Positive Electrode
separation of the positive
and negative plates
u u ar p a es ma e
from special low
antimony selenium alloy
Negative ElectrodeGrid flat plate made from
selenium alloy
Container
2910/14/2010
-
8/7/2019 DC UPS Training Course
30/47
Presentation of Battery
Battery Data
Electrolyte Sulphuric acidAmpere Hour 3000
No. of Cells 60
Internal Resistance 0.1 m/cell
Short Circuit Current 19200 A
Total Weight 13700 KGoa ng o age . ce
3010/14/2010
-
8/7/2019 DC UPS Training Course
31/47
Presentation of CVT
Principle of Operation
CVT stands forConstant Voltage Transformer.
CVT is a voltage regulator. The main purpose of using a CVT is toprovide stabilized output voltage within certain limits.
,
motor driven variable autotransformer and a series transformer
(booster).
3110/14/2010
-
8/7/2019 DC UPS Training Course
32/47
Presentation of CVT
Principle of Operation
The control circuit is connected on the output of the regulator.
When the output voltage varies from a preset value, an unbalance is
detected by the control circuit.
This unbalance signal is amplified and used to operate the servo driven
motor of the autotransformer.
This movement gives to the series transformer the additive or subtractive
voltage necessary to have the correct output value.
3210/14/2010
-
8/7/2019 DC UPS Training Course
33/47
Presentation of CVT
CVT Data
Rated Power (kVA) 50
Input Voltage Variation +/- 10%
Rated Current 150 A
Nominal Output Voltage 230 V
3310/14/2010
-
8/7/2019 DC UPS Training Course
34/47
Presentation of CVT
CVT Data
-
Output Frequency 50/60 Hz +/- 2%
Load Power Factor Any
Harmonic Distortion Less Than 0.2
3410/14/2010
-
8/7/2019 DC UPS Training Course
35/47
Presentation of CVT
CVT Data
Operating Temperature 0 to 40 oC
Degree of Protection IP20
Wei ht 430 k
Dimension 1800*800*800 (H*W*D)
3510/14/2010
P t ti f AC/DC P l
-
8/7/2019 DC UPS Training Course
36/47
Presentation of AC/DC Panels
ng e ne agram
Main DC
Panel
.
Panel
8EDED02
AC UPSPanel
8EUEU01
3610/14/2010
-
8/7/2019 DC UPS Training Course
37/47
Presentation of AC/DC Panels
Main DC Panel (8EDED01)
Incomin Feeders
Rectifier # 1 Rectifier # 2 Battery
3710/14/2010
-
8/7/2019 DC UPS Training Course
38/47
Presentation of AC/DC Panels
Main DC Panel (8EDED01)
Out oin Feeders
Inverter Measuring andsignaling
Spare
DC DIS.Panel
3810/14/2010
-
8/7/2019 DC UPS Training Course
39/47
Presentation of AC/DC Panels
DC Distribution Panel Outgoing Feeders
Continue..
3910/14/2010
-
8/7/2019 DC UPS Training Course
40/47
Presentation of AC/DC Panels
DC Distribution Panel Outgoing Feeders
Continue..
4010/14/2010
-
8/7/2019 DC UPS Training Course
41/47
Presentation of AC/DC Panels
DC Distribution Panel Outgoing Feeders
Incoming Feeder
From Main DC Panel
Continue..
4110/14/2010
-
8/7/2019 DC UPS Training Course
42/47
Presentation of AC/DC Panels
DC Distribution Panel Outgoing Feeders
Continue..
4210/14/2010
-
8/7/2019 DC UPS Training Course
43/47
Presentation of AC/DC Panels
DC Distribution Panel Outgoing Feeders
Continue..
4310/14/2010
-
8/7/2019 DC UPS Training Course
44/47
Presentation of AC/DC Panels
AC UPS Panel Outgoing Feeders
Continue..
4410/14/2010
-
8/7/2019 DC UPS Training Course
45/47
Presentation of AC/DC Panels
AC UPS Panel Outgoing Feeders
Continue..
4510/14/2010
-
8/7/2019 DC UPS Training Course
46/47
Presentation of AC/DC Panels
AC UPS Panel Outgoing Feeders
Incoming Feeder
From Inverter/CVT
Continue..
4610/14/2010
-
8/7/2019 DC UPS Training Course
47/47
Presentation of AC/DC Panels
AC UPS Panel Outgoing Feeders
4710/14/2010