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CONNECTION ASSESSMENT & APPROVAL PROCESS
ASSESSMENT SUMMARY
Applicant: Hydro One Networks Inc.
Project:
Burlington TS – Installation of a New 128kV
125MVAR Capacitor Bank
CAA ID: 2003 – EX123
Long Term Forecasts & Assessments Department
Consistent Information Set Department
Date: March 19, 2003
Assessment Summary
Hydro One Networks Inc.
Burlington TS – Installation of a New 128kV 125MVAR Capacitor Bank
CAA ID: 2003 – EX123
1.0 Description of Proposal
Hydro One Networks Inc. is proposing to install a new 128kV 125MVAR capacitor bank at Burlington
TS to meet the increasing reactive power demand in the Hamilton – Burlington area.
The new 125MVAR capacitor bank SC11 will be connected directly to the K1 bus at Burlington TS
through two series connected SF6 breakers, series reactors, and a motor operated disconnect switch as
shown in Figure 1.
The primary breaker SC11SC for isolating the new capacitor bank will be an independent pole operated
breaker to minimize the effect of capacitor bank switching on local customers. The back-up breaker
SC11K will be a conventional gang operated breaker.
Series reactors, rated at 2.0mH per phase, will be installed on the capacitor bank to limit the capacitor
bank inrush and outrush transient currents. The series reactors will be installed between the motor
operated disconnect switch and the back-up breaker as shown in Figure 1.
Metal oxide gapless surge arrestors and a 3-phase gang operated grounding switch will be installed
between the primary breaker and the new capacitor bank. A single phase grounding switch will also be
connected to the neutral point of the wye-connected capacitor bank.
The scheduled in-service date of the new capacitor bank SC11 is May 2004.
Specifications of major electrical components are:
v Capacitor Bank
Capacitance:
Maximum Operating Voltage:
Configuration:
Symmetrical Short Circuit Rating:
Insulation Level:
125MVAR ± 5% @ 128kV ± 1kV
128 kV
Single wye ungrounded or double wye ungrounded
40kA minimum
550kV BIL
v Discharge Device
None required (Each capacitor unit is equipped with a 5-minumte discharge resistor)
v Series Reactors
Inductance:
Maximum Operating Voltage:
2.0mH per phase at 60Hz
127kV continuous
150kV for 5 minutes
Continuous Current:
625A rms
Symmetrical Short Circuit Rating: 63kA for 12 cycles
Asymmetrical Short Circuit Rating: 160kA peak
Insulation Level:
550BIL
-2-
Assessment Summary
Hydro One Networks Inc.
Burlington TS – Installation of a New 128kV 125MVAR Capacitor Bank
v Circuit Breakers
Type:
Interruption Medium:
Maximum Operating Voltage:
Rated Interrupting Capacity:
Rated Interrupting Time:
Insulation Level:
Transient Recovery Voltage
Across Pole:
v Disconnect Switch
Continuous Current Rating:
Maximum Operating Voltage:
Momentary Current Rating:
Insulation Level:
CAA ID: 2003 – EX123
Primary SC11SC - Independent pole operated with
synchronized closing
Back-up SC11K – Gang operated
SF6
128kV continuous
40kA symmetrical, 48kA asymmetrical
3 cycles
550BIL
310kV peak
625A minimum
127kV continuous
150kV for 5 minutes
63kA
550BIL
-3-
Assessment Summary
Hydro One Networks Inc.
Burlington TS – Installation of a New 125MVAR 128kV Capacitor Bank
To
Newton TS
B3
To
Guelph Cedar TS
B4
B6G
B5G
CAA ID: 2003 – EX123
To
Bronte TS
B7
To
Gage TS
B8
B10
To
Newton TS
B11
B12
B13
New Facilities
K1 Bus
K2 Bus
N.O.
SC11K
SC11SC
SC11
N.O.
P1 Bus
To 230kV
Switchyard
P2 Bus
To 230kV
Switchyard
To 230kV
Switchyard
Figure 1 - Burlington TS 115kV Switchyard
-4-
To 230kV
Switchyard
Assessment Summary
Hydro One Networks Inc.
Burlington TS – Installation of a New 125MVAR 128kV Capacitor Bank
CAA ID: 2003 – EX123
2.0 Assessment
With the present fault level at the 115kV switchyard of the Burlington TS, the voltage change upon
switching the new 125MVAR capacitor bank either in or out of service is expected to be less than 2%.
A power flow study has confirmed that the voltage change upon switching a 128kV 125MVAR capacitor
bank at Burlington TS would be about 1.6%. This would comply with the maximum limit of 4% for
capacitor switching stipulated in the Market Rules.
The two SF6 circuit breakers have an interrupting capability of 40kA. With the proposed arrangement of
having the current limiting series reactors installed upstream of the circuit breakers, the 40kA breakers
would be adequate for the projected fault levels. The applicant has further specified that should physical
constraints dictate that the series reactors be installed downstream of the circuit breakers, then the
breakers would be rated at 63kA.
The proposed new capacitor bank at Burlington TS would improve the voltage profile in the Hamilton Burlington area and would have no adverse impact on the IMO-controlled grid.
3.0 Notification of Approval
Based on the above assessment, it is recommended that a Notification of Approval for this proposal be
issued to the applicant.
-5-
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