earthing+commissioning+procedure

Document Number: ECP 11-0503

Version: 1.0

Date: 15/07/2013

TH

IS IS

AN

UN

CO

NT

RO

LL

ED

DO

CU

ME

NT

, T

HE

RE

AD

ER

MU

ST

CO

NF

IRM

IT

S V

AL

IDIT

Y B

EF

OR

E U

SE

ENGINEERING COMMISSIONING PROCEDURE

ECP 11-0503

EARTHING COMMISSIONING PROCEDURE

Network(s): EPN, LPN, SPN

Summary: This document details the testing and commissioning procedures for secondary distribution substation earthing.

Originator: Stephen Tucker Date: 15/07/2013

Approved By: Steve Mockford Approved Date: 31/07/2013

Review Date: 31/01/2018

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

Document History

(The document history notes below are intended as a guide only and may not cover all of the changes. If you wish to make use of this document it should be read in full.)

Version Date Details Originator

1.0 02/05/2013 Original Stephen Tucker

Earthing Commissioning Procedure Document Number: ECP 11-0503

Version: 1.0

Date: 15/07/2013

UK Power Networks 2013 All rights reserved 2 of 5

Contents

1 Introduction ............................................................................................................. 3

2 Scope ....................................................................................................................... 3

3 References ............................................................................................................... 3

4 Abbreviations and Definitions ................................................................................ 3

5 Equipment ................................................................................................................ 4

6 Inspection ................................................................................................................ 4

7 Measurements ......................................................................................................... 4

8 Drawing .................................................................................................................... 4

9 Test Equipment ....................................................................................................... 4

10 Asset Data ................................................................................................................ 5

11 Certification ............................................................................................................. 5


Version: 1.0

Date: 15/07/2013


1 Introduction

1.1 This document details the testing and commissioning procedures for secondary distribution substation earthing that shall be satisfied before the site can be accepted as fit for service and energisation.

1.2 This procedure shall be carried out by the Commissioning Engineer or his appointed representative, who shall be an Authorised Person having appropriate training and experience.

1.3 This procedure shall be carried out in accordance with the requirements of the UK Power Networks Distribution Safety Rules.

1.4 This procedure shall be carried out having regard to the requirements and recommendations of the manufacturer. If conflict exists between the requirements of the manufacturer and those of UK Power Networks the matter shall be referred to Asset Management (or your UK Power Networks nominated contact).

1.5 The results of all observations, tests, adjustments and all relevant remarks shall be recorded on the appropriate test form.

2 Scope

2.1 This procedure applies to all secondary distribution substations.

2.1 This procedure is intended for use by UK Power Networks field staff, contractors and external connection providers.

3 References

3.1 This procedure should be read in conjunction with the following references:

UK Power Networks Distribution Safety Rules.

ECS 06-0024 Earthing Testing and Measurements.

3.2 This procedure should be used with the following test forms:

ECP 11-0503a Earthing Test Form.

4 Abbreviations and Definitions

4.1 The following abbreviations are used throughout this procedure.

Term Definition

NetMap UK Power Networks graphical information system (GIS)


Version: 1.0

Date: 15/07/2013


5 Equipment

5.1 The following equipment is required to carry out the tests detailed in this procedure. Refer to ECS 06-0024 Earthing Testing and Measurements for details of suitable instruments.

Four-terminal composite earth tester and leads or

Clamp type earth tester.

6 Inspection

6.1 Record the substation and earthing design details on the test form.

6.2 Carry out a visual inspection of the earthing system as detailed below.

HV earth rods and grading electrodes installed.

LV earth installed (HOT site only).

Neutral/earth link installed (COLD site only) or removed (HOT site only).

Switchgear connected to the main earth terminal.

Transformer connected to the main earth terminal.

Rebar connected to the main earth terminal.

LV cabinet/pillar/board connected to main earth terminal.

Metallic fence correctly earthed and connected to main earth terminal if applicable.

Metallic gates correctly earthed and connected to main earth terminal if applicable.

All other ancillary items of equipment/metalwork bonded to main earth terminal if applicable.

All earths have a separate connection on to the main earth terminal and are labelled.

7 Measurements

7.1 Measure the HV earth resistance using a four-terminal composite earth tester or clamp type earth tester, in accordance ECS 06-0024, and compare with the design value.

7.2 Measure the LV earth resistance (HOT site only) using a four-terminal composite earth tester or clamp type earth tester, in accordance ECS 06-0024, and compare with the design value.

8 Drawing

8.1 Mark up a NetMap drawing showing the location of the earthing or provide a suitable sketch.

9 Test Equipment

9.1 Record the purpose, make, type and serial number of all test equipment used during commissioning on the test form.


Version: 1.0

Date: 15/07/2013


10 Asset Data

10.1 If the site is HOT send the substation details to the earthingenquiries@ukpowernetworks mailbox to enable the site to be recorded in the substation earthing database.

10.2 Send a copy of the marked up NetMap plot (or sketch of the earthing system) to UK Power Networks Network Records team.

11 Certification

11.1 When all the tests have been satisfactorily completed, sign and date the test form. Place a copy of the test form on-site in a plastic wallet and in a secure location.

earthing+commissioning+procedure

Documents