EDS+05-2010+Main+Substation+Feeder+and+Ring+Main+Unit+Protection+Settings+(LPN).pdf

7/25/2019 EDS+05-2010+Main+Substation+Feeder+and+Ring+Main+Unit+Protection+Settings+(LPN).pdf

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Document Number: EDS 05-2010

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ENGINEERING DESIGN STANDARD

EDS 05-2010

MAIN SUBSTATION FEEDER AND RING MAIN UNITPROTECTION SETTINGS (LPN)

Network(s): LPN

Summary: This standard describes the protection settings for main substation feeders and ringmain units in the LPN area.

Owner: Kevin Burt Date: 02/12/2015

Approved By: Barry Hatton Approved Date: 08/01/2015

This document forms part of the Companys Integrated Business System and its requirements are mandatory throughout UKPower Networks. Departure from these requirements may only be taken with the written approval of the Director of AssetManagement. If you have any queries about this document please contact the author or owner of the current issue.

Applicable To

UK Power Networks External

All UK Power Networks G81 Website

Asset Management Contractors

Capital Programme ICPs/IDNOs

Connections Meter Operators

HSS&TT

Network Operations

UK Power Networks Services

Other


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UK Power Networks 2016 All rights reserved 2 of 14

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Revision Record

Version 4.0 Review Date 08/01/2019

Date 02/12/2015 Author Kevin Burt

Why has the document been updatedPeriodic review

What has changedNo content changes

Document transferred onto a new template and rules applied


Date 04/09/2012 Author Lee Strachan

Document reviewed for publishing on G81 website


Date 25/08/2011 Author Chris Anderson

Reclassified from EI to EDS


Date 19/08/2010 Author David G Edwards

Rebranded, reviewed and review date extended

Version 2.0 Review Date


TLF ratings and revised ACB protection settings added Tables (6A and 11A)

Version 1.0 Review Date


Original, based on Protection Standard Number E 7/6 P 6/1 revision 4. Original no. EI 05-0046


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Contents

1 Introduction ............................................................................................................. 4

2 Scope ....................................................................................................................... 4

3 Glossary and Abbreviations ................................................................................... 4

4 Main Substation Feeder Settings ........................................................................... 4

5

Secondary Distribution Transformers ................................................................... 4

5.1 Transformer Overcurrent Protection .......................................................................... 4

5.2

Transformer Earth Fault Protection ............................................................................ 4

6

HV Supplies ............................................................................................................. 5

6.1 HV Supplies to the Customers HV Switchboard........................................................ 5

6.1.1 Overcurrent Protection .............................................................................................. 5

6.1.2 Earth Fault Protection ................................................................................................ 5

Tables

Table 1Main Substation Feeder Settings ........................................................................... 6

Table 2Ring Circuit Breaker and Service Circuit BreakerElectromechanical .................. 6

Table 3Ring Circuit Breaker and Service Circuit BreakerVIP 200/300 ........................... 7

Table 4SEPAM 1000 ......................................................................................................... 7

Table 5SEPAM 1000+. ...................................................................................................... 8

Table 6Overcurrent Protection of Distribution Transformers (Glass Barrel TLF FuseLinks) ................................................................................................................... 9

Table 7Overcurrent Protection of Distribution Transformers (Tagged TLF Fuse Links) ... 11

Table 8Settings for Merlin Gerin Masterpact ACB Control Unit STR58U (Glass BarrelTLF Fuse Links) ................................................................................................. 11

Table 9Masterpact ACB STR 58U - 1200/1600A ACB with MODULE 1600A (GlassBarrel TLF Fuse Links) ...................................................................................... 12

Table 10Masterpact ACB STR 58U2000A ACB with MODULE 2000A (Glass BarrelTLF Fuse Links) ............................................................................................. 12

Table 111600A and 2000A Module (Glass Barrel TLF Fuse Links) ................................. 12

Table 12Micrologic NW16/20 H11600/2000A Module (Glass Barrel TLF Fuse Links) . 13

Table 13Micrologic NW16/20 H11600/2000A Module (Tagged TLF) ........................... 13

Table 14Sensitive Earth Fault Settings ............................................................................ 13

Table 15Overcurrent Protection of HV Supplies (refer to Section 6.1.1) .......................... 14

Table 16Falcon Alpha RMU Overcurrent Trip Times Versus Fault Current...................... 14


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1 Introduction

This standard describes protection settings for main substation feeders and ring main unitsin the UK Power Networks (UKPN) LPN region.

2 Scope

This standard only applies to the London Power Network (LPN) area.

3 Glossary and Abbreviations

Term Definition

UK Power Networks UK Power Networks (Operations) Ltd consists of three electricitydistribution networks:

Eastern Power Networks plc (EPN).

London Power Network plc (LPN).

South Eastern Power Networks plc (SPN).

4 Main Substation Feeder Settings

The overcurrent and earth fault settings shall be as listed inTable 1 unless otherwise agreedwith UKPN Asset Management.

5 Secondary Distribution Transformers

5.1 Transformer Overcurrent Protection

The rating of the time-limit fuse-links or the type of thermal protection modules forovercurrent protection of secondary distribution transformers applied at ring main units andtheir associated air circuit breakers shall be as listed inTable 6.

5.2 Transformer Earth Fault Protection

Instantaneous sensitive earth fault protection with sensitivities as declared in Table 14 isinherent in the design of all but:

The Falcon Alpha units (original Falcon units) where it is provided, when specified, viadedicated core balanced current transformers; and

Switch fuses, where it is not good practice to provide it.

It should be noted that such a provision is not normally present on transformer mountedFalcon Alpha units.


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6 HV Supplies

Where an HV supply is connected directly to the customers own transformer, of which therating and winding arrangement and impedance are similar to the Companys distributiontransformers, then Section 5 of this document shall apply. For transformers not soidentifiable, advice should be sought from UKPN Asset Management. Where relays are usedto afford protection then the settings shall be as inTable 1, Table 2 andTable 3.

If Microprocessorrelays are used, reference should be made to UKPN Asset Managementwith full details of the proposed installation so that individual settings can be supplied.

6.1 HV Supplies to the Customers HV Switchboard

6.1.1 Overcurrent Protection

Discrimination with the customers own equipment, other than fuses for HV faults, is notfeasible with ring main units protected by time fuse links. Discrimination with the customersequipment can be afforded by use of protective relays. Relays installed with characteristicsbased on the standard inverse BS 142 curve shall have settings as in Table 2. Relayssupplied with adjustable complex curves, may need special treatment and shall be referredto UKPN Asset Management.

In some cases the customer will not require discrimination with the service and thus it maybe possible to use time fuses for overcurrent (and instantaneous protection for earth faultswhen applicable). The rating of the time fuse link and thermal modules for these cases shall

be as listed inTable 15.

Limited discrimination is possible with units protected by thermal protection modules, andTable 16 relates to Falcon Alpha overcurrent trip times to fault current as an applicationguide. In cases of doubt advice should be sought from UKPN Asset Management. WhereFalcon Alpha units are used to provide such a supply then the module shall be as specifiedinTable 15.

6.1.2 Earth Fault Protection

Earth fault protection can be provided by protection relays and for the standard inverse curve

relay settings refer to Table 2 and Table 3. In the case of Microprocessor relays refer toUKPN Asset Management.

Instantaneous sensitive earth fault protection with sensitivities as declared in Table 14 isinherent in the design of all but;

The Falcon Alpha ring main unit, where it is provided, when specified, via a dedicatedcore balance current transformer; and

Switch fuses, where it is not provided. The switch fuse will, however, discriminate withthe main substation earth fault relay for earth faults exceeding 800A downstream of thering main unit.


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Where Falcon Alpha ring main units are installed, and there is a requirement by the

customer for discrimination, no instantaneous earth fault protection is needed and thefollowing applies:

For applications (seeTable 15)using the D module, no specific earth fault protection isnecessary because the D module discriminates with the main substation earth faultrelay for earth faults downstream of the ring main unit;

For applications using the F module, a separate IDMT earth fault current relay fed fromthe core balance current transformer and set at 120 primary amperes 0.15 timemultiplier, tripping via the shunt trip coil should be installed. This will prevent the mainsubstation earth fault relay from operating before the ring main unit for earth faultsdownstream of the ring main unit.

Table 1Main Substation Feeder Settings

High Set Overcurrentwhen Provided

IDMT Overcurrent IDMT Earth Fault

Feeders without HVcustomers or where HVsupplies are afforded tocustomers own distributiontransformers

2400-3200A 600A 0.2TM 200A 0.2TM

Feeders from which at leastone HV supply is afforded to

customers HVswitchboard

Not deployed 600A 0.35TM 200A 0.35TM

Table 2Ring Circuit Breaker and Service Circuit BreakerElectromechanical

Method of Supply Ring CB Service CB

IDMTOvercurrent

IDMT EarthFault

IDMTOvercurrent

IDMT EarthFault

Unit protected twofeeders in parallel

450A 0.15TM 150A 0.15TM

Unit protected threefeeders in parallel

600A 0.15TM 200A 0.15TM 450A 0.15TM 150A 0.15TM

Directionalprotected twofeeders in parallel

600A 0.15TM 200A 0.15TM 450A 0.15TM 150A 0.15TM

Radial Feed 450A 0.15TM 150A 0.15TM


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Table 3Ring Circuit Breaker and Service Circuit BreakerVIP 200/300

VIP 200/300

CTRatio

200/1 800/1 800/1

Position Service Service Ring

O/C SI 200A, t=0.4s

(equivalent totms=0.135)

SI 448A, t=0.4s


SI 576A,T=0.4s

(equivalent to tms=0.135)

E/F SI 140A, t=0.4s


SI 128A, t=0.4s


SI 196A, t=0.4s


VIP 300

CTRatio

400/1 Not suitable for Ring Busters

Position Service

O/C SI 400A, t=0.4s


E/F SI 160A, t=0.4s

(equivalent to

tms=0.135)

Notes:1. VIP Relays are self powered from the CT, the maximum setting is 100% of the CT primary rating.2. As from September 2003 YRM switchgear came with 400/1 CTs.

Table 4SEPAM 1000

Position Service Service Ring

CT Ratio 200/1 600/1 600/1

Overcurrent SI 440A, t=0.4s


SI 450A, t=0.4s


SI 600A,T=0.4s


Earth Fault SI 150A, t=0.4s


SI 150A, t=0.4s


SI 200A, t=0.4s



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Table 5SEPAM 1000+.

PositionService

SELECT A+B

Ring

SELECT A+B

CT Ratio 600/1 600/1

OvercurrentSIT 450, t=0.450s


SIT 600A,T=0.450s


E/FSIT 150A, t=0.450s


SIT 200A, t=0.450s


Notes:1. For all the above settings refer to Asset Management.2. Special applications will be considered to assist customers with their downstream protection grading. Such

requests shall be sent to Asset Management and if abnormal settings are to be issued for application tonetwork protection, a note of this abnormality shall be attached in the control graphics system, adjacent tothe substation concerned.

3. Settings and logic for all microprocessor relays are the responsibility of Programme Delivery, ProtectionApplications.


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Table 6Overcurrent Protection of Distribution Transformers (Glass Barrel TLF Fuse Links)

Equipment CTRatio

Voltage Transformer Ratings

500kVA 750/800kVA 1000kVA 2x500kVA 2 x750/800kVA

BrushFalcon

ALPHARMU

8/1 6.6kV D D (*3) - - -

(*1) 11kV C D D D (*2) -

19/1 6.6kV - - F E (*2) -

(*1) 11kV - - - - E (*2)

BrushFalconBETA RMU

50/5 6.6kV 10A - - - -

11kV7.5A - seetable 8

10A - - -

100/5 6.6kV - 7.5A 10A 10A -

11kV - - 7.5A 7.5A 10A

Yorkshire(*6)SwitchgearRingmasterRMU MK1.5

75/5 6.6kV7.5A (*4) -see table8

10A (*4) 10A (*4) 10 (*2) -

11kV 5A 7.5A 10A 7.5 (*2)

YorkshireSwitchgearRingmasterRMU MK 2

50/5 6.6kV 10A - - - -


10A - - -

100/5 6.6kV - 7.5A 10A 10A -

11kV - - 7.5 7.5A 10A

Long & (*7)Crawford(*8) LCGTRMU(Switchfuse)

- 6.6kV 100(80)A 140(100)A140(100)

A- -

11kV 63(50)A 80(63)A 100(80)A - -

Lucy (*8)

SFRMU CF1Switchfuse

- 6.6kV 80A 125A - - -

- 11kV 50A 80A 100A - -

LucySCRMU

70/5 6.6kV 10A - - - -


10A - - -

100/5 6.6kV - 7.5A 10A 10A -

11kV - - 7.5A 7.5 10A


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Equipment CTRatio

Voltage Transformer Ratings

500kVA 750/800kVA 1000kVA 2x500kVA 2 x750/800kVA

ABBSentinelRMU

50/5 6.6kV 10A - - - -


10A - - -

100/5 6.6kV - 7.5A 10A 10A -

11kV - - 7.5A 7.5A 10A

All OtherRMUs

50/5 6.6kV 10A - - - -


10A - - -

80/5 6.6kV7.5A - seetable 8

10A - - -

11kV 5A 7.5A 10A 10A 10A

100/5 6.6kV - 7.5A (*4) 10A 10A -

11kV - - 7.5A 7.5A 10A

MasterpackACB

Standard settings set at factory for 1200 & 1600 amp units see Table 9. Any other unitsneed to be referred to System Development Protection

ACB

800/5 0.433kV 7.5A - - 7.5A -

1200/5 0.433kV 5A 7.5A - 5A 7.5A

1600/5 0.433kV - - 7.5A - -

Notes:1. On the Falcon Alpha RMU, current transformers are matched to particular types of protection modules.

Unless specifically agreed with the MPL Protection Section, module types must not be interchanged betweenthe two CT types. The CTs are mounted inside the SF6chamber which must be returned to the manufacturerif a change is necessary.

2. In the interests of faster fault clearance, discrimination across the distribution transformer is sacrificed if theLV windings are paralleled.

3. Some loss of discrimination across the distribution transformer results from avoiding a CT change on

uprating to 11kV operation.4. Discrimination across the transformer is sacrificed in the interest of faster fault clearance.5. This ratio is not available on Yorkshire Ringmaster, Lucy SCRMU, or Falcon BETA RMUs.6. Yorkshire Ringmasters, pre-MK 2 on the LPN network, are referred to as MK 1.5.7. Figures quoted are fuse rating in oil. Ratings in air are shown in brackets.8. Discrimination with LV ACBs is not guaranteed and should not be used with solidly interconnected LV

systems.9. Discrimination between Falcon ALPHA RMUs and MSS is not guaranteed for faults between the RMU and

its transformer.10. There is no overload factor on this application.11. For applications other than the above, advice should be sought from Asset Management


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Table 7Overcurrent Protection of Distribution Transformers (Tagged TLF Fuse Links)

Voltage Transformer rating CT ratio TLF rating SAP code

11 kV

500 kVA 40/5 N/A N/A

50/5 N/A N/A

800 kVA 80/5 15 A 11947C

100/5 15 A 11947C

1000 kVA 80/5 15 A 11947C

100/5 15 A 11947C

Note: For existing distribution substations with a 500kVA transformer where HV switchgearis to be changed and the 500kVA transformer is to be retained, it is not possible to gradetag-type TLFs with the LV fuses. Therefore, when replacement of the HV equipment isnecessary, complete the following:

Install a Lucy Sabre VRN2A RMU.

Retro fit clips for glass barrel-type TLFs.

Install 10A glass barrel-type TLFs.

Table 8Settings for Merlin Gerin Masterpact ACB Control Unit STR58U (Glass Barrel TLF FuseLinks)

Characteristics Setting Value Dial Position Dial Position

Long Time Pick Up LT 1600A IO= 1 Ir=1

Long Time Time Delay LT 15 s tr= 15 -

Short Time Pick Up ST 2400A Im=1.5 -

Short Time Time DelayST

0.2 s tm= 0.2 -

I2t ON tmDial Set Clockwise to 0.2

Instantaneous Pick Up 12800A I = 8 -

Notes:

1. For transformers of all sizes associated with 1200A and 1600A ACBs using 1600A sensors.2. These settings grade with downstream J400A fuses. They will not grade with J-type distribution fuses of

higher rating.3. Upstream RMU 7.5A TLFs with 50/5, 70/5, 75/5 and 80/5 CTs must be changed to 10A TLFs (Glass Barrel

TLF Fuse Links).


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Table 9Masterpact ACB STR 58U - 1200/1600A ACB with MODULE 1600A (Glass Barrel TLF

Fuse Links)

1200/1600amp ACB with MODULE 1600A

TransformerSize

TLFMin CTratio

Io Ir tr Im tm I2t I

500kVA 50/5 1 1 15 1.5 0.2 on 12

800kVA 80/5 1 1 15 1.5 0.2 on 14

800kVA 75/5 1 1 15 1.5 0.2 on 14

1000kVA 100/5 1 1 15 1.5 0.2 0n 22

Notes:1. Settings to apply for transformers with services having 630A or 800A fuses and on interconnected areas

using 500A fuses.2. Always use 10A TLFs (Glass Barrel TLF Fuse Links).

Table 10Masterpact ACB STR 58U2000A ACB with MODULE 2000A (Glass Barrel TLF FuseLinks)

TransformerSize

CTRatio

Io Ir tr Im tm I2t I

1000kVA 100/5 1 1 15 1.5 0.2 0n 17

Notes:1. Where two transformers are connected in parallel at LV from different feeders, in the event of an earth fault

on one feeder, there is the possibility of the feeder being back fed by the other transformer.2. This will occur with radial LV networks, where hold-up performance is poor in fully interconnected LV

networks.3. This arrangement is to coordinate with reverse power relays and parasitic trip units.

Table 111600A and 2000A Module (Glass Barrel TLF Fuse Links)

Module TransformerSize

CT ratio Io Ir tr Im tm I2t I

1600A 2 x 1000kVA 100/5 1 1 15 3 0.2 on 22

2000A 2 x 1000kVA 100/5 1 1 15 3 0.2 on 17

Notes:1. Masterpact NM ACB.2. Micrologic 5.0A.3. Settings to apply for transformers with services having 630A or 800A fuses and on interconnected areas

using 500A fuses.4. Always use 10A TLFs (Glass Barrel TLF Fuse Links)


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Table 12Micrologic NW16/20 H11600/2000A Module (Glass Barrel TLF Fuse Links)

Protection settings to be applied when grading with a glass barreled TLF fuse link. Refer to Table 6 Over-current protection of distribution transformers (Glass Barrel TLF)

ModuleTransformerSize

TLF MinCT Ratio

Ir tr Isd tsd Iinst

Micrologic NW16 H1- 1600A

All 100/5 1.00 4.0 8.00 0.1+I2t 15


All 100/5 1.00 4.0 6.00 0.1+I2t 15

Note: For all Micrologic these settings are factory set. They will need to be checked at the time of commissioning.

Table 13Micrologic NW16/20 H11600/2000A Module (Tagged TLF)

Protection settings to be applied when grading with a Tagged TLF fuse link. Refer to Table 7 Over-current protection of distribution transformers (Tagged TLF).

ModuleTransformerSize

TLF MinCT Ratio

Ir tr Isd tsd Iinst


All 100/5 1.00 12 6.00 0.1+I2t 15

Micrologic NW20 H1- 2000A All 100/5 1.00 4.0 4.00 0.1+I

2

t 15

Note: For all Micrologic these settings are factory set. They will need to be checked at the time of commissioning.

Table 14Sensitive Earth Fault Settings

Equipment CT Ratio Sensitive Earth Fault Setting

Brush ALPHA RMU Core balance

400/5 30 A

Brush BETA RMU 50/5

100/5

30 A

40 A

Yorkshire Ringmaster MK1.5 75/5 20A

Yorkshire Ringmaster MK2 50/5

100/5

20 A

25 A

Lucy SCRMU 70/5

100/5

20 A

25 A

ABB

Sentinel RMU

50/5

100/5

20 A - 27 A

28 A - 35 A

All RMUs except Switch Fusesand the above

50/5

80/5

100/5

20 A

20 A

25 A


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Table 15Overcurrent Protection of HV Supplies (refer to Section 6.1.1)

Equipment Load MVA at 6.6kV MVA at 11kV Module/fuse CT

Brush FalconALPHA

0-100A 0-1.1 0-1.9 d (1) 8/1

100-180A 1.1-2.0 1.9-3.4 F (1) 19/1

>180A >2.0 >3.4 Use extensible switchgear

YorkshireSwitchgearRingmaster

0-150A 0-1.7 0-2.85 10A 75/5 MK1

0-200A 0-2.28 0-3.8 10A 100/5 MK2

MK2 only for downstream discrimination using relays

Long &

CrawfordLCGT Sw/fuse

0-80A 0.9 1.5 100(80)A(7)

-

Lucy SFRMU-CF1 Sw/fuse

0-83A 0.95 1.58 125A -

All RMUsexcept asabove

0-100A 0-1.1 0-1.9 10A 100/5

Notes:1. For downstream discrimination a relay should be used. Refer to Asset Management for VIP200 Settings.2. Refer to Section6.1.2 for earth fault protection requirements.

Table 16Falcon Alpha RMU Overcurrent Trip Times Versus Fault Current

Fault Current (A) D Module (s) F Module (s)

1000 0.8 1.0

2000 0.45 0.4

4000 0.3 0.22

6000 0.25 0.17

8000 0.22 0.15

10000 0.2 0.13

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