2010 WAO10 ConferenceElectric Power System Design of PEFP
to Ensure Reliability in Operation

Apr. 13, 2010
Kyeong-Jun Mun

ContentsⅠ. Introduction

Ⅱ. Electrical Power System of PEFP
Ⅲ. Monitoring & Control of Electrical Power System of PEFP

Ⅳ. Conclusions

Introduction■ When faults occur in electric power systems, impact of outages should beminimized and the faulted facilities should be restored as soon as possible.

■ This requires that an operator in the control center should find the reason andthe location of the faults by analyzing the alarm information of protective relays
or circuit breakers.

■ Based on the alarm information in electric power system, we designed the propermonitoring & control system for the electric power system of PEFP.

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□ Electrical Power System of PEFPProton Accelerator Research Center of PEPF
Geoncheon Substation(154kV Substation)

Power Supply Building

5Overview of the Electrical System■ Electric Power System In 100MeV Proton Accelerator Conventional Facilities• Electric power is supplied by 154kV substation, 154/3.3kV step-downtransformers.

•Power Distribution System- normal power system① 3.3kV Switchgear② 480, 220V Load Center③ 480V MCC (Motor Control Center)- Emergency Power system① UPS (uninterruptible power supply) & DC System)② emergency diesel generator

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Electrical System Component
Flow Diagram of the Electric Power System of PEFP

154kV/3.3kVTransformer
154kV T/L

RFModulators

GIS

Power Distribution System

Loads of theConventional
Facilities

LV SWGRor MCC

Distribution TR
3.3kV/480V, 220V, 120V

3.3kV SWGR
Large
MotorsEmergency Power System(DG, UPS, DC)

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Electric Power System Configuration of PEFP
154kV T/L
CB 617154kV
BUS

154/3.3kV

SST A1

3.3kV SWGR
A1

SST A2SST B1

3.3kV SWGR
A2

SST B2ToBldgs
RF#21RF#22

3.3kV SWGR B2

3.3kV SWGR B1

RF#101~#104...
480V BUS

To Bldgs

125V BUS
DGUPS

System A : RF SystemBattery

System B : Conventional Facilities System

220V BUS

154kV Substation Facilities in Power Supply Building
Functions of the 154kV Substation Facilities● It receives power through the one 154kV overhead transmission line from the 154kV substation.

● It is located near the proton accelerator facility and supplies electrical power to theaccelerator conventional facility via 154/3.3kV step down transformer.
● Also the system includes control, monitoring and protection facilities.

 Major Equipments• Unit Service Transformers (154/3.3kV)• Single 154kV Bus- 5/6.67MVA (ONAN/ONAF) : 2 Banks for RF System• Gas Insulated Switchgear (GIS)- 15/20MVA (ONAN/ONAF) : 2 Banks for Conventional Facilities- 170kV, 50kA , 1200A (32 MVA)
- 1 Bank for Normal Operation, 1 Bank for Stand-by

9Power Distribution System Configuration of PEFP
From SST A1

From SST A2

3.3kV SWGR

3.3kV SWGR

A1

A2RFRF4 Sets

3 SetsFrom SST B1● Power Distribution System provides electric power to the1) RF power supply system (System A)2) Conventional Facilities (System B)

From SST B2

3.3kV SWGR

3.3kV SWGR

B1

B2To Bldgs

To Bldgs

480V BUS
220V BUS
UPSDG● Power Distribution System consists of :1) 3.3kV switchgear system
2) 480V & 220V load center system
3) 480V motor control system (MCC)
4) emergency power system(Diesel generator, UPS, DC system)

Power Distribution System Components
 Major Equipments• 3.3kV switchgear System- 2 sets for RF modulators (System A)- 2 sets for the conventional facilities (System B)- Use Vacuum circuit breakers- Large motor loads (≥250 Hp) and distribution TRs are powered from 3.3kV Switchgears.
• 480V & 220V Load Center System- 3 phase, 3.3kV/480V, 3.3kV/220V delta-wye connection- 480V emergency load center with emergency diesel generator.
- It supplies power to1) 480V rated load2) 100kW ~ 400kW non-motor load3) 480V MCC- 3.3kV/220V load center transformer supplies power to 220V rated load such as test facilities.

• 480V Motor Control Center System- motor (45kW and less)- Motor operated valves (MOV)- process control- Heat tracing system- Cathodic Protection Facilities- Non-motor (75kW and less)- Heater- lighting and receptacle- Moisture resting heater
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Emergency Power System Configuration
DC & UPS System
480V MCC

480V MCC

BATTERYReg.

CHARGER

XFMRA

M

125V DC MCC

BATTERY

120V AC DIST.PNL

Diesel Generator System
Functions of the Diesel Generator System● Function of the Emergency Diesel Generators- Provide Backup Power for Essential Loads during Loss of Offsite Power- Automatic Starting and Power Restoring without Interruption● Specification of the Emergency Diesel Generators- 3 Phase, 480V, 50~200kW Class- Diesel generators can operate for 2000 hours continuously.
- Diesel generators can operate with overload condition for 2 hours continuously outof 24 consecutive hours without excessive vibration or damage of engine/generator.
● 2 sets will be installed- Accelerator and Beam Application Bldg, Ion Beam Application Bldg, etc- Support Buildings (such as Main Office, Regional Cooperation and Dormitory Building)● Emergency Diesel Generators will supply power to the following systems :- Access Control System- Standby Ventilation Fans for Tunnel/Experimental Hall
- Emergency Lighting for Tunnel/Experimental Hall
- Standby Lighting System13

DC Power System
DC Power System● Function of the DC System- DC power system supplies DC power to the DC loads of the proton accelerator
conventional facilities and 120V UPS system.
- AC power supplied from 480V emergency diesel generator bus is transformed
to DC power through the battery charge.
● Design Features- Nominal Voltage : 125V (Operating Range 105~140V)- 30 Minutes Duty Battery

 Major Equipments- Battery : 58 Cells (2.16V/Cell)- Charger : Full charging capacity within 12 hours- Distribution Panels

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UPS System
UPS System● Function of the UPS System- It provides reliable AC power with constant voltage and frequency.
- For High Quality and High Reliability Power Required Loads.
ex) the vital control and instrument devices- It is provided power from 480V emergency diesel generator bus and from 480V common bus● Design Description of the UPS System- 120V AC and 220V AC- 30 Minute Duty
- AVR, Inverter, Battery, and Distribution Panel● UPS will supply power to the following systems- Safety Interlock System- Vacuum System Instrumentation and Control- Critical Power Supply Control and Protection(Relay, CB and Trip)- Main Control Room Server and Network Hardware- Selected Telecommunication Equipment- Selected Alarm System

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Power Distribution System
Single Line Diagram of Power Distribution System (3.3kV)

3 phase154/3.3kV Transformer

3 phase154/3.3kV Transformer

PowerCoolingUtility
Supply Tower Area Bldg
Facility
BLDG

Accelerator & Beam Application Bldg
(Accelerator Tunnel, Klystron Gallery,
Beam Experiment Hall)

Ion Beam
Application
Bldg

Large Motor Load

Main Office Regional Wastewater Large Motor Load
BLDG
Coop.
Treatment
BLDG
BLDG

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Power Distribution SystemSingle Line Diagram of Power Distribution System (220V)

Accelerator & Beam Application Building

Ion Beam Application Building□ Monitoring & Control ofElectrical Power System of PEFPMonitoring & Control of Electric Power System

 Remote Control• 154kV GIS
1) CB
2) DS
3) Earthing switches• 3.3kV switchgear
1) Incoming breaker2) 220 & 480V L/C, 480V MCC
3) TR feeder breaker Remote Monitoring• 154kV GIS operating status• Transformer operating status• 3.3kV SWGR, 480V L/C, 480 MCC and 220 L/C system operatingstatus• 125V DC, 120V vital AC system operating status

19Electric Power System Protection
Functions of the Electric Power Protection System● When a fault occurs on a power system such as buses, lines, transformers, etc., faulted
section should be removed promptly.
● If fault is not cleared early, personal injuries and serious damages in electrical facilities canoccur.
● To remove faulted section, appropriate circuit breakers are tripped by corresponding
protective relays operation.
● Alarm signals warn possible fault unless alarm status cleared.
● Alarm signals , protective relays and circuit breakers for fault conditions are transmittedto the control centers.

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Power Distribution System Protection Scheme
Protective Relay for each Power System Component
Protective Relay
487 (Differential Relay)
421 (Distance Relay)
450 (Overcurent Relay)
427 (Undervoltage Relay)
487 (Differential Relay)
427 (Undervoltage Relay)
450 (Breaker Failure Protection Relay)
487A (Differential Relay)
450/451 (Overcurrent Relay)
451N (Neutral Ground overcurrent relay on Transformer
primary)
151N (Neutral Ground overcurrent relay on Transformer
secondary)
63X (Pressure Relay)
27 (Undervoltage Relay)
47 (Phase Sequence Voltage)
25 (Synchronism Check)
51 (overcurrent relay)
51N (Ground Overcurrent Relay)
51 (Phase Overcurrent Relay)
51N (Phase Overcurrent Relay)
51G (Ground Fault)

Equipment
154kV T/L
154kV Switchgear

154kV/3.3kVTransformer

3.3kV Switchgear

3.3kV FeederPower Distribution System Protection Logic
154kV T/L and Bus Protection LogicPower Distribution System Protection Logic
154kV/3.3kV Transformer Protection Logic

Emergency Power System Protection Scheme
Protective Relay for each Power System Component
Protective Relay

Equipment

DG rated voltage & frequency
Emergency Diesel Generator

51 (Phase Overcurrent)
64 (DC bus ground)
72 (Incoming Battery Charger Breaker Open/Trip)
72 (Battery Charger Incoming/Output Breaker Open/Trip)
37 (Battery Charger DC Output Failure)
27 (Battery Charger Low DC Voltage)
59 (Battery Charger High DC Voltage)
27 (DC bus undervoltage)

UPS & DC System

Emergency Power System Protection Logic
Diesel Generator Protection

Emergency Power System Protection Logic
DC & UPS Protection

Conclusions■ Electric Power System of PEFP
- 154kV Substation- 3.3kV Switchgear- Power Distribution System(480V L/C, MCC, 220V L/C, Emergency Diesel Generator, UPS/DC system)■ Monitoring & Control system of Electric Power System is designed.
- Protective device/Protection logic is designed for each power system component

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