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Hydro One Protection Summary

PCT‐in‐a‐Box

Distance‐Based Feeder Protection

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Agenda

•   Brief  Intro to DESN Stations

•   Traditional PCT

 Design

•   Drivers for Change

•   Implementation of 

 “PCT

‐in

‐a‐Box”

•   Distance‐based Feeder Protection

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INTRO TO DESN STATIONS

Dual‐Element Spot Networks

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“Jones” Station

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HV LINE 1

HV LINE 2

LV BUS 1

LV BUS 2

DS-T1-H DS-T2-H

CB

X1

CB

X2

BU

1-2

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“Bermondsey” Station

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IMPLEMENTATION OF TURN‐KEY 

PCT DESIGNS

PCT‐in‐a‐Box

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Traditional Approach

•   Brick‐and‐mortar buildings

•   Construction entirely

 done

 on

‐site

•   Largely electromechanical, static relays

•

  Some 

early 

IEDs 

(PALC, 

SEL‐

251)•   Signals hardwired, use of  “trip bus” auxiliary 

logic

•   Reliability, cost

 factors

 in

 protection

 

implementations 

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Drivers for

 Change

•   Refurbishment of  aging assets

•   Pressure on

 costs

•   Increasing workload, reduced staff 

•   Shorter project turns

•   New Technologies

•   Advanced microprocessor‐based P&C devices

•   Need for

 better

 Operational,

 Non

‐operational

 

information

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Full DESN

 PCT

 Solution

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Full DESN

 PCT

 Solution

•   “Turn‐key” steel building installed on‐site

•   All protection,

 control,

 telecom

 equipment

 

specified as part of  design

•

  Highly standardised,

 repeatable

 design

•   Modern PCT implementations based on HONI 

standard designs

•   Concept has

 also

 been

 used

 in

 certain

 HV

 

stations as well

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Modern PCT

 Implementations

•   Modern Teleprotection, telecommunications 

for improved

 reliability,

 security

•   Better use of  advanced multifunction IEDs

•

  Advanced 

protections 

(e.g. 

transformer 

RGF)•   Better operational, non‐operational data

•   Advanced Control infrastructure

•   IRIG‐B

 time

 synchronization

•   Local computer‐based control & annunciation

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FEEDER PROTECTION USING 

DISTANCE‐BASED IEDS

Advanced Feeder Protection

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Distance‐Based

 Feeder

 Protection

•   Driven by proliferation of  DG integration 

projects

•   Flexibility for various operating conditions

•

  Reverse 

power 

flow, 

non‐

radial 

fault 

currents•   DGs in/out of  service

•   Back‐to‐back feeder paralleling

•   In‐line

 reclosers

•   Operational considerations

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Distance‐Based

 Feeder

 Protection

•   Current standard implementation is based on 

the GE

 D60

•   Same design package can provide traditional 

overcurrent as well as distance‐based (DGs)

•   Distance provides better sensitivity, security

•   Fault and sequence of  events recording

•   Multiple setting

 groups,

 Operator

 control

•   Breaker failure protection for feeder breakers

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Distance‐Based

 Feeder

 Protection

•   Settings based on Feeder Setting Specification

•   HONI Grid

 Operations

  – P&C

 Technical

 Services

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Feeder Fault

 Values

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Questions?

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