Download - UPS and DC power training Presentation
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UNINTERRUPTIBLE POWER
SUPPLY (UPS)
ABDUL HASEEB SIDDIQIINTERNEE, NED UNIVERSITY
[email protected] www.hasboo.co.nrJULY, 2008
ENGRO POLYMER & CHEMICALS LTD
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UPS maintains a continuous supply of electric power to connected equipment by supplying power from a separate source when utility power is not available.
It differs from an auxiliary power supply or standby generator, which does not provide instant protection from a momentary power interruption
WHAT IS UPS ?
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DEG powers the emergency loads of the plant & UPS in case of power failure.UPS powers control system during DEG starting so that there is no interruption during power failure.
Incase of DEG failure, UPS is used to bring the plant process to safe shut down.
It mainly turns off the critical valves.
WHY UPS?
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UPS CHARACTERISTICS
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UPS @
Battery location : Battery room in CCR
UPS location : Cabinet room in CCR
Backup time: 30 min
Charging time : 8 hours
Quantity: Two ( 48 KW for UL-II, 15KW for PVC-II)
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Redundant
125% overload for 10 min, 150% for 1 min and 250% for 20ms.
Two battery units. 48KW UPS has 320 battery units(200AH each) while 16KW has 400 units each(50AH).
Voltage inspection range : -15% to +30%
Local and remote indication/alarm of any failure
CHARACTERISTICS
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Redundant equipment in separate cubicles to allow maintenance without interruption.
Battery connection to UPS is through an isolating switch in UPS cabinet.
Cooling : low velocity forced air (redundant fans)
Maintenance bypass s/w is in separate enclosure from ups cabinet, so ups can be completely removed.
Power : EMCC/MCC buses
CHARACTERISTICS
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OPERATING MODES
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NORMAL MODE
Battery
Static switch
bypass
Bypass
supply
UPS
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BACKUP MODE
Battery
Static switch
bypass
Bypass
supply
UPS
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BYPASS MODE
Battery
Static switch
bypass
Bypass
supply
UPS
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MAINTENANCE MODE
Battery
Static switch
bypass
Bypass
supply
UPS
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•Full load heat soak run
•Overload tests
•Step Load application
•Steady state regulation
•Charger and inverter current limiting
•Input inrush current measurement
•Load changeover
TESTS•Measurement of maximum input current
•Harmonic distortion
•Non linear load simulation
•Protection co-ordination
•functional, alarm and tripping check
•Operation of all equipment.
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UPS LOADS
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General substation
PVC-II S/S
PVC-IIMastery IP 16KW
UT-IIDelphys MP Elite 48KW
POWER TO UPS
CCR
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MAIN DISTRIBUTON
UPS consumers
AC (DCS )
DC (24V to field instruments)
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UPS AC LOAD
• Operator workstation• Marshalling cabinet• Emergency panel• Server• Color and B/W printers• Local control box• Instrument dc power DB
Power to DCS
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UPS FIELD DISTRIBUTION
• Mass flow meters• magnetic flow meters• Ultra sonic meters• Cod analyzers• PH analyzers• HCL concentration• Weighing instruments• Solenoid valve
UPS field supply
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Field instrument area wise
Feedstock (6100)
Polymerizer
(6200)
Drying unit(630
0)
Cooling water unit
(4400)
Dematerialized water
unit (4600)
FIELD DISTRIBUTION
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UNINTERRUPTIBLE DC POWER @
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DC POWER CHARACTERISTICS
A UPS designed for powering DC equipment is very similar to an online UPS, except that it does not need an output inverter.
DC power is from a separate UPS without an inverter.
It powers the MV switch gear control of General substation, PVC-II substation and EDC\VCM substation.
One DCP is at General Substation (30 KW) and other smaller DCP is at PVC-II Substation (4KW) next to DEG room.
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DCP installed in GSS
Control protectionGSS Bus-A,
Bus-B,
Bus-C,
EMEC
Bus
EDC/
VCM
Bus-I,
Bus-II
CCR DC-DB
Power for switch onGSS
Bus-A, Bus-B, Bus-C, EMEC Bus
EDC/VCM Bus-I, Bus-II
STG lube oil pump Power for DEG
DCP LOAD
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TYPES & COMPONENTS
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POWER PROBLEMS
Voltage sag
Voltage spike
Under-voltage
(brownout)
Over-voltage
Line noise
Frequency
variation
Switching transient
Harmonic distortion
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TYPESOFFLINE
LINE INTERACTIVE
ONLINE
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OFFLINE OR STANDBY UPS
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LINE INTERACTIVE UPS
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ONLINE UPS
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BATTERY & STATIC SWITCH
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BATTERY
• Storage batteries are the energy source for UPS systems during a power outage. UPS systems demand a high discharge rate for a relatively short time at a constant power and require relatively good regulation of output voltage.UPS storage batteries are made up of a string of series-connected cells to achieve the voltage in the range between 48-400V. • The two major categories of storage batteries used
in UPS are nickel-cadmium (NiCd) and lead acid. The lead-acid battery is one of the most inexpensive, most reliable and most widely used storage batteries. The NiCd batteries have a much greater cycle life than the lead-acid type, but they cost about 4-6 times more than lead-acid batteries.• For a given battery capacity, a NiCd battery is
smaller and lighter than a comparable lead-acid battery
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STATIC TRANSFER SWTICH
• UPS can maintain supply to load either from the UPS Inverter output or from the mains (bypass) supply. • The static switch of an on-line UPS has two
operational states, ‘on UPS’ (the normal condition) and ‘on bypass’. In both cases it provides a very fast transfer between the inverter output and the bypass. The decision is made by the static switch’s own and/or the UPS control logic which continually monitors the bypass (mains) and inverter voltages. The control logic typically controls the phase and frequency of the UPS inverter(s) to ensure that the bypass and inverter voltages are in phase (synchronised) with each other. Bi-directional, break-free transfer between the two supply sources is only possible when the bypass and the inverter are ‘synchronised’.
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STATIC TRANSFER SWTICH
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STATIC TRANSFER SWTICH
During normal operation, with the inverter supplying the load, SCRs 3 and 4 are triggered and SCRs 1 and 2 are not triggered. In the event of an inverter supply problem the static switch monitoring circuitry would identify it and decide to transfer load. It stops triggering SCRs 3 & 4 and starts triggering SCR 1 and 2. Once an SCR is triggered it continues to conduct until the voltage across it is zero. By triggering SCRs 1 and 2 while SCRs 3 and 4 are still conducting, the bypass and inverter are paralleled for a short time. Such short term paralleling ensures a break-free transfer between the two supplies and it is for this reason that the two supplies must be synchronized before the transfer can take place. If the transfer was allowed regardless of the synchronization status of the two supplies then the load would almost certainly be subjected to a power disturbance.
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THANKYOU!