Objective

• Discuss success of CapSwitcher® product line

• Introduce the new 38 kV CapSwitcher®

• Competitive comparison

• Discussion and questions

CapSwitcher® Today

Between the above products, hundreds of units have already been supplied and are in service since the first shipment in December, 2003.

38 kV – 72.5 kV 123 kV – 170 kV

72.5 kV CapSwitcher®

38 kV Capacitor Bank at First Energy Corporation

This unit replaced Joslyn VBM vacuum switches with Zero Voltage Control (ZVC)

Over one-third of all 72.5 kV CapSwitchers®

sold have been installed at 38 kV.

CapSwitcher® Application

Capacitor bank switching is a special duty.

CapSwitcher® Challenges

Restrikes cause cascading overvoltages that can:

• Rupture capacitor cans

• Blow fuses

• Fail arrestors

Potential problems when switching capacitor banks:

Introducing

THE NEW 15.5 - 38 kV CapSwitcher ®

Capacitor Switching with Transient Protection

Resistor Pre-Insertion

Single-Gap SF6 Interrupter

10,000+ Operations

Ships Fully Assembled and Pressurized with Composite Insulators

Ships Within 6 weeks ARO

From the family of SF6 switching products designed specifically for Capacitor Switching

CapSwitcher®

Ratings (15.5 kV – 38 kV Size Units)

80 kV60 kV50 kVPower Frequency Withstand Voltage

200 kV150 kV110 kVBIL

10,000 operationsEndurance Life

23 kA peak at 5400 HzHigh Frequency Transient Making Current

65 kA peakAsymmetrical Making Current25 kA, 1 secShort Circuit Withstand Voltage

6 Ω, 10 Ω, 12 Ω, 20 Ω, 30 Ω, or 90 Ω,

Closing Resistor Values (Pre-Insertion time 5 to 15 msec)

15 sec – C – 6 cycle – ODuty Cycle

600 AmpsCapacitor Switching / Continuous Current

38 kV27 kV15.5 kVMaximum Voltage (50/60 Hz)

Testing Standards

IEEE C37.09 (1999) Sec 4.13Endurance test

IEEE C37.09 (1999) Sec 4.3Continuous current test

IEEE C37.66 (2006) Sec 6.4Fault-making current test

IEEE C37.09a (2005) Sec 4.10Capacitor bank current switching test (BC2, Making Test)

IEEE C37.09a (2005) Sec 4.10Capacitor bank current switching test (BC1, Breaking Test)

IEEE C37.09a (2005) Sec 4.10Capacitor bank current switching test (BC2, Breaking Test)

IEEE C37.66 (2006) Sec 6.3Short-time and peak withstand current test

IEEE C37.66 (2006) Sec 6.8Radio interference voltage (RIV) test

IEEE C37.66 (2006) Sec 6.2Chopped-wave impulse withstand voltage test

IEEE C37.66 (2006) Sec 6.2Full-wave lightning impulse withstand voltage test

IEEE C37.66 (2006) Sec 6.1.4Power frequency withstand voltage test

CAP38 – 600 – XXX R - XXXXXXControl Voltage

48VDC125VDC120VAC

15 kV 27 kV 38 kVBank Size 2 - 6 MVAR 3 - 6 MVAR 3 - 6 MVARCurrent (<225 A) (<135 A) (<80 A)Resistor Size 20 Ω 30 Ω 90 ΩCat # Designation 20R 30R 90R

Bank Size 6.1 - 9 MVAR 6.1 - 16 MVAR 6.1 - 16 MVARCurrent (226 - 335 A) (136 - 360 A) (81 - 240 A)Resistor Size 10 Ω 20 Ω 30 ΩCat # Designation 10R 20R 30R

Bank Size 9.1 - 16 MVAR 16.1 - 27 MVAR 16.1 - 40 MVARCurrent (336 - 600 A) (361 - 600 A) (241 - 600 A)Resistor Size 6 Ω 12 Ω 12 ΩCat # Designation 6R 12R 12R

Capacitor Switching Rating & Continuous Current Rating

Voltage Rating

15.5 kV27 kV38 kV

Example: 38 kV CapSwitcher® for a 38 kV, 8 MVAR cap bank, with 125 VDC control voltage.

Catalog number: CAP38-600-30R-125VDC

Catalog Number

CapSwitcher® Outline Drawings

The 15.5-38 kV CapSwitcher® has 16” phase spacing

Accessories

• Connecting Cable• Cable Connection Box • Mounting Adapter Angles• Structure (when not mounted in capacitor bank structure)

Accessories are ordered separately. These may include:

Traditional Products

Joslyn 38 kV VBM Varmaster with Zero Voltage Close (3 mechanisms and 6

vacuum bottles)

No company offers pre-insertion at 38 kV, in a 38 kV size package.

Joslyn 38 kV VBM Varmaster

(1 mechanism and 6 vacuum bottles)

Cooper 15.5 kV VCR Three Phase

Capacitor Switch(Oil Switch w/ pre-insertion resistors)

There is a need for a 15.5-38 kV CapSwitcher ®There is a need for a 15.5-38 kV CapSwitcher ®

38 kV Capacitor Switching Options:

Competitive Comparison

Joslyn VBM with Current Limiting Reactor

Pros: . Low Cost . Small Size. Ability to be Mounted onthe Capacitor Bank

. Reactor Limits CurrentTransient

Cons: . No Voltage TransientMitigation

. Poor History of Reliability

. Multiple Gap Per PhaseInterrupters

Joslyn VBM without Zero Voltage Close

Pros: . Cost Comparable to 38 kV CapSwitcher®

. Small Size

. Ability to be Mounted on theCapacitor Bank

Cons: . Poor History of Reliability. Multiple Gap Per PhaseInterrupters

. Multiple Mechanisms (one perphase) Required to AchieveSynchronous Closing

. Failure of One of theMechanisms to Operate CanResult in Single Phasing theCapacitor Bank

Competitive Comparison

Joslyn VBM with Zero Voltage Close (ZVC)

Vacuum Switch

CapSwitcher® - Only from Southern States!

15.5 – 38 kV

123 - 170 kV

38 - 72.5 kV

The CapSwitcher® is a family of Products Designed Specifically For Capacitor Switching

Featuring:• SF6 Single Gap Puffer

Interrupters• Spring Open-Spring Close

Mechanism• Closing Resistor for Transient

Mitigation

Now Available from 15.5 kV – 170 kV

CapSwitcher®

15.5 kV to 170 kV

Single Capacitor Bank

Back-to-Back Capacitor Banks

Grounded or Ungrounded Banks

Closing Resistor for Transient Suppression

Size Limitations in Substation

Replacement of Failed Vacuum Capacitor Switches

CapSwitcher® Applications

Designed Specifically for Capacitor

Switching

Maximum Voltage (50/60 Hz) 15.5 kV - 38 kVCapacitor Switching / Continuous Current

600 A

Duty Cycle 15 sec - C - 6 cycle - O

Closing Resistor Values(Pre-Insertion time 5 to 15 ms)

6 Ω, 10 Ω, 12 Ω, 20 Ω, 30 Ω, or 90 Ω

Short Circuit Withstand (rms) 25 kA, 1 secAsymmetrical Making Current 65 kA peakHigh Frequency Transient Making Current

23 kA peak at 5400 Hz

Endurance Life 10,000 Operations

CapSwitcher®

Ratings (15.5 kV – 38 kV Size Units)

A family of SF6 switching products designed specifically for Capacitor Switching

10,000 OperationsEndurance Life

10 time 40 kAFault Closing Rating

5 CyclesInterrupting Speed

25 kAShort Circuit Interrupting Current

104 kA peakAsymmetrical Making Current

40 kA, 1 secShort Circuit Withstand (rms)

8 Ω, 20 Ω, 40 Ω, or 80 ΩClosing Resistor Values(Pre-Insertion time 5 to 15 ms)

O - 5 min – CO - 5 min – CO (The 5 minutes is to discharge the capacitor bank)

(2 faults per hour max because of resistor heating)

Duty Cycle

600 ACapacitor Switching/ Continuous Current

38 kV - 72.5 kVMaximum Voltage (50/60 Hz)

CapSwitcher®

Ratings (38 kV – 72.5 kV)

A family of SF6 switching products designed specifically for Capacitor Switching

A family of SF6 switching products designed specifically for Capacitor Switching

10,000 OperationsEndurance Life

2 time 63 kA10 time 40 kA

Fault Closing Rating

3 CyclesInterrupting Speed

40 kAShort Circuit Interrupting Current

163 kA peakAsymmetrical Making Current

63 kA, 18 cycles40 kA, 1 sec

Short Circuit Withstand (rms)

37.5 Ω, 75 Ω, 150 Ω, or 300 ΩClosing Resistor Values(Pre-Insertion time 5 to 15 ms)

O - 5 min – CO - 5 min – CO (The 5 minutes is to discharge the capacitor

bank) (2 faults per hour max because of resistor

heating)

Duty Cycle

650 ACapacitor Switching/ Continuous Current

123 kV - 170 kVMaximum Voltage (50/60 Hz)

CapSwitcher®

Ratings (123 kV – 170 kV)

CapSwitcher® Application

Power Fuse

CT

72.5 kV CapSwitcher®

Capacitor Bank

48.3 kV Capacitor Bank at Alabama Power Company

72.5 kV CapSwitcher®

Application

Selma TS -44kv Capacitor Bank -Recorded Voltage/Current During Energization 10-12-04 12:21:56 PM

-80

-60

-40

-20

0

20

40

60

80

39.0 39.5 40.0 40.5 41.0 41.5 42.0 42.5 43.0

Cycles Recorded From Start

Bus

s Vo

ltage

In K

V (4

99S3

)

-600

-450

-300

-150

0

150

300

450

600

Cap

acito

r Ban

k C

urre

nt In

Am

ps

Ph 1 KV Ph 2 KV Ph 3 KV Ph 3 Amps

Resistor Pre-insertion

Main Shorts out resistor

1.1 PU Overvoltage

“Pre-insertion works every time”

Single Capacitor Bank Switching:

Interrupter Contact Capacitor

Bank

Closing resistor will limit voltage transients to ~20% over-voltage

No inrush reactor is required with a closing resistor.

Closing Resistor

Resistor Contact

~V

CapSwitcher ®

CapSwitcher® Applications:

The closing resistor limits currents on closing to within breaker ratings.

Back to Back Switching with CapSwitcher®

:

Interrupter Contact

Closing resistor reduce inrush current transients to acceptable levels.

Closing ResistorResistor Contact

CapSwitcher ®

Interrupter Contact

Closing ResistorResistor Contact

CapSwitcher ®

~V

CapSwitcher® Applications:

On back to back applications it is necessary to limit inrush currents.

No Resistor

Resistor Switches inClosing Resistor

Main Contacts Short Out Resistor

Switching with closing resistor reduces switching surges

V

I

I

Close Switcher on Capacitor

Switching Surge ~70% Over-voltage

Switching Surge ~20% Over-voltage

~70%Over-voltage

V

CapSwitcher®

Switching Surge Comparisons:

~20%Over-voltage