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Issue 4 OC5 - i 24 June 2009

OPERATING CODE NO. 5

TESTING AND MONITORING

CONTENTS

(This contents page does not form part of the Grid Code)

Paragraph No/Title Page No

OC5.1 INTRODUCTION.......................................................................................................... 1

OC5.2 OBJECTIVE ................................................................................................................. 3

OC5.3 SCOPE......................................................................................................................... 3

OC5.4 MONITORING.............................................................................................................. 4

OC5.4.1 Parameters to be monitored................................................................................ 4

OC5.4.2 Procedure for monitoring..................................................................................... 4

OC5.5 PROCEDURE FOR TESTING..................................................................................... 5

OC5.5.1 Request for Testing ............................................................................................. 5

OC5.5.2 Conduct of Test ................................................................................................... 6

OC5.5.3 Test Assessment ................................................................................................. 8

OC5.5.4 Test Failure/Re-test........................................................................................... 13

OC5.5.5 Dispute following Re-test................................................................................... 13

OC5.6 DISPUTE RESOLUTION........................................................................................... 13

OC5.7 BLACK START TESTING.......................................................................................... 14

OC5.7.1 General.............................................................................................................. 14

OC5.7.2 Procedure for a Black Start Test ....................................................................... 14

OC5.7.2.1 BS Unit Tests.................................................................................... 14

OC5.7.2.2 BS Station Test................................................................................. 15

OC5.7.2.4 Failure of a Black Start Test.............................................................. 15



Issue 4 OC5 - ii 24 June 2009



Issue 4 OC5 - 1 24 June 2009

OPERATING CODE NO. 5

TESTING AND MONITORING

OC5.1 INTRODUCTION

Operating Code No. 5 ("OC5") specifies the procedures to be followed byNGET in carrying out:

(a) monitoring

(i) of BM Units against their expected input or output;

(ii) of compliance by Users with the CC and in the case of response toFrequency, BC3; and

(iii) of the provision by Users of Ancillary Services which they arerequired or have agreed to provide; and

(b) the following tests (which are subject to System conditions prevailing onthe day):

(i) tests on Gensets, CCGT Modules, Power Park Modules, DCConverters and Generating Units (excluding Power Park Units)to test that they have the capability to comply with the CC and, inthe case of response to Frequency, BC3 and to provide theAncillary Services that they are either required or have agreed toprovide;

(ii) tests on BM Units, to ensure that the BM Units are available inaccordance with their submitted Export and Import Limits, QPNs,Joint BM Unit Data and Dynamic Parameters.

The OC5 tests include the Black Start Test procedure.

OC5 also specifies in OC5.8 the procedures which apply to the monitoring andtesting of Embedded Medium Power Stations not subject to a BilateralAgreement and Embedded DC Converter Stations not subject to a BilateralAgreement.

In respect of a Cascade Hydro Scheme the provisions of OC5 shall be appliedas follows:

(y) in respect of the BM Unit for the Cascade Hydro Scheme theparameters referred to at OC5.4.1 (a) and (c) in respect of CommercialAncillary Services will be monitored and tested;

(z) in respect of each Genset forming part of the Cascade Hydro Schemethe parameters referred to at OC5.4.1 (a), (b) and (c) will be tested andmonitored. In respect of OC5.4.1 (a) the performance of the Gensets will be tested and monitored against their expected input or output



Issue 4 OC5 - 3 24 June 2009

following provisions of OC5 the term Genset will be read and construed in theplace of BM Unit.

In respect of Embedded Exemptable Large Power Stations the provisions ofOC5 shall be applied as follows:

(1) where there is a BM Unit registered in the BSC in respect ofGenerating Units the provisions of OC5 shall apply aswritten;

(2) in all other cases, in respect of each Generating Unit theparameters referred to at OC5.4.1(a), (b) and (c) will be testedand monitored. In respect of OC5.4.1(a) the performance ofthe Generating Unit will be tested and monitored againsttheir expected input or output derived from the data submittedunder BC1.4.2(a)(2). Where necessary to give effect to therequirements for such Embedded Exemptable Large Power

Stations in the provisions of OC5 the term Generating Unit will be read and construed in place of BM Unit.

OC5.2 OBJECTIVE

The objectives of OC5 are to establish:

(a) that Users comply with the CC;

(b) whether BM Units operate in accordance with their expected input oroutput derived from their Final Physical Notification Data and agreedBid-Offer Acceptances issued under BC2;

(c) whether each BM Unit is available as declared in accordance with itssubmitted Export and Import Limits, QPN, Joint BM Unit Data and Dynamic Parameters; and

(d) whether Generators, DC Converter Station owners and Suppliers canprovide those Ancillary Services which they are either required or haveagreed to provide.

In certain limited circumstances as specified in this OC5 the output of CCGTUnits may be verified, namely the monitoring of the provision of AncillaryServices and the testing of Reactive Power and automatic FrequencySensitive Operation.

OC5.3 SCOPE

OC5 applies to NGET and to Users, which in OC5 means:

(a) Generators;

(b) Network Operators;



Issue 4 OC5 - 4 24 June 2009

(c) Non-Embedded Customers;

(d) Suppliers; and

(e) DC Converter Station owners.

OC5.4 MONITORING

OC5.4.1 Parameters to be monitored

NGET will monitor the performance of:

(a) BM Units against their expected input or output derived from their FinalPhysical Notification Data and agreed Bid-Offer Acceptances issuedunder BC2;

(b) compliance by Users with the CC; and

(c) the provision by Users of Ancillary Services which they are required orhave agreed to provide.

OC5.4.2 Procedure for Monitoring

OC5.4.2.1 In the event that a BM Unit fails persistently, in NGET's reasonable view, to follow, in any material respect, its expected input or output or a User failspersistently to comply with the CC and in the case of response to Frequency,BC3 or to provide the Ancillary Services it is required, or has agreed, toprovide, NGET shall notify the relevant User giving details of the failure and ofthe monitoring that NGET has carried out.

OC5.4.2.2 The relevant User will, as soon as possible, provide NGET with an explanationof the reasons for the failure and details of the action that it proposes to taketo:

(a) enable the BM Unit to meet its expected input or output or to provide theAncillary Services it is required or has agreed to provide, within areasonable period, or

(b) in the case of a Generating Unit (excluding a Power Park Unit), CCGTModule, Power Park Module or DC Converter to comply with the CC and in the case of response to Frequency, BC3 or to provide theAncillary Services it is required or has agreed to provide, within areasonable period.

OC5.4.2.3 NGET and the User will then discuss the action the User proposes to take andwill endeavour to reach agreement as to:

(a) any short term operational measures necessary to protect other Users; and

(b) the parameters which are to be submitted for the BM Unit and theeffective date(s) for the application of the agreed parameters.



Issue 4 OC5 - 5 24 June 2009

OC5.4.2.4 In the event that agreement cannot be reached within 10 days of notification ofthe failure by NGET to the User, NGET or the User shall be entitled to requirea test, as set out in OC5.5 and OC5.6, to be carried out.

OC5.5 PROCEDURE FOR TESTING

OC5.5.1 Request For Testing

OC5.5.1.1 NGET may at any time (although not normally more than twice in any calendaryear in respect of any particular BM Unit) issue an instruction requiring a User to carry out a test, provided NGET has reasonable grounds of justificationbased upon:

(a) a submission of data, or a statement from a User indicating a change inplant or apparatus or settings (including but not limited to governor andexcitation control systems) that may reasonably be expected to result ina material change of performance; or

(b) monitoring carried out in accordance with OC5.4.2; or

(c) notification from a User of completion of an agreed action from OC5.4.2.

OC5.5.1.2 The test, referred to in OC5.5.1.1 and carried out at a time no sooner than 48hours from the time that the instruction was issued, on any one or more of theUser’s BM Units should only be to demonstrate that the relevant BM Unit:

(a) if active in the Balancing Mechanism, meets the ability to operate inaccordance with its submitted Export and Import Limits, QPN, Joint BMUnit Data and Dynamic Parameters and achieve its expected input oroutput which has been monitored under OC5.4; and

(b) meets the requirements of the paragraphs in the CC which are applicableto such BM Units; and

in the case of a BM Unit comprising a Generating Unit, a CCGT Module, a Power Park Module or a DC Converter meets,

(c) the requirements for operation in Frequency Sensitive Mode andcompliance with the requirements for operation in Limited FrequencySensitive Mode in accordance with CC.6.3.3, BC3.5.2 and BC3.7.2; or

(d) the terms of the applicable Supplemental Agreement agreed with theGenerator to have a Fast Start Capability; or

(e) the Reactive Power capability registered with NGET under OC2 whichshall meet the requirements set out in CC.6.3.2. In the case of a test on aGenerating Unit within a CCGT Module the instruction need not identifythe particular CCGT Unit within the CCGT Module which is to be tested,but instead may specify that a test is to be carried out on one of theCCGT Units within the CCGT Module.

OC5.5.1.3 (a) The instruction referred to in OC5.5.1.1 may only be issued if the relevantUser has submitted Export and Import Limits which notify that therelevant BM Unit is available in respect of the Operational Day current at



Issue 4 OC5 - 6 24 June 2009

the time at which the instruction is issued. The relevant User shall then beobliged to submit Export and Import Limits with a magnitude greaterthan zero for that BM Unit in respect of the time and the duration that thetest is instructed to be carried out, unless that BM Unit would not then beavailable by reason of forced outage or Planned Outage expected priorto this instruction.

(b) In the case of a CCGT Module the Export and Import Limits data mustrelate to the same CCGT Units which were included in respect of theOperational Day current at the time at which the instruction is issued andmust include, in relation to each of the CCGT Units within the CCGTModule, details of the various data set out in BC1.A.1.3 and BC1.A.1.5,which parameters NGET will utilise in instructing in accordance with thisOC5 in issuing Bid-Offer Acceptances. The parameters shallreasonably reflect the true operating characteristics of each CCGT Unit.

OC5.5.2 Conduct Of Test

OC5.5.2.1 The performance of the BM Unit will be recorded at Transmission ControlCentres notified by NGET with monitoring at site when necessary, from voltageand current signals provided by the User for each BM Unit under CC.6.6.1.

OC5.5.2.2 If monitoring at site is undertaken, the performance of the BM Unit will berecorded on a suitable recorder (with measurements, in the case of aSynchronous Generating Unit, taken on the Generating Unit StatorTerminals / on the LV side of the generator transformer) or in the case of aNon-Synchronous Generating Unit (excluding Power Park Units), PowerPark Module or DC Converter at the point of connection in the relevantUser’s Control Room, in the presence of a reasonable number ofrepresentatives appointed and authorised by NGET. If NGET or the User requests, monitoring at site will include measurement of the following

parameters:

(a) for Steam Turbines: governor pilot oil pressure, valve position and steampressure; or

(b) for Gas Turbines: Inlet Guide Vane position, Fuel Valve positions, FuelDemand signal and Exhaust Gas temperature; or

(c) for Hydro Turbines: Governor Demand signal, Actuator Output signal,Guide Vane position; and/or

(d) for Excitation Systems: Generator Field Voltage and Power SystemStabiliser signal where appropriate.

(e) for Power Park Modules: appropriate signals related to thevoltage/ Reactive Power / Power Factor control system and theFrequency control system as agreed at the time of connection.

(f) for DC Converters: appropriate signals related to the voltage/ ReactivePower / Power Factor control system and the Frequency control systemas agreed at the time of connection.



Issue 4 OC5 - 7 24 June 2009

OC5.5.2.3 The test will be initiated by the issue of instructions, which may beaccompanied by a Bid-Offer Acceptance, under BC2 (in accordance with theExport and Import Limits, QPN, Joint BM Unit Data and DynamicParameters which have been submitted for the day on which the test wascalled, or in the case of a CCGT Unit, in accordance with the parameterssubmitted under OC5.5.1.3). The instructions in respect of a CCGT Unit withina CCGT Module will be in respect of the CCGT Unit, as provided in BC2.

OC5.5.2.4 The User is responsible for carrying out the test when requested by NGET inaccordance with OC5.5.1 and retains the responsibility for the safety ofpersonnel and plant during the test.



Issue 4 OC5 - 8 24 June 2009

OC5.5.3 Test and Monitoring Assessment

P a s s C

r i t e r i a

( t o b

e r e a d i n c o n j u n c t i o n w i t h t h e f u l l

t e x t u n d e r t h e G r i d C o d e r e f e r e n c e )

M e a s u r e d

h a r m o n i c e m i s s i o n s d o n o t e x c e e d t h e l i m i t s s p e c i f i e d i n t h e B i l a t e r a l

A g r e e m e n t o r w h e r e n o s u c h l i m i t s a r e s p e

c i f i e d , t h e r e l e v a n t p l a n n i n g l e v e l

s p e c i f i e d i n G 5 / 4 .

T h e m e a s u r e d m a x i m u m P h a s e ( V o l t a g e ) U n b a l a n c e o n t h e N a t i o n a l E l e c t r i c i t y

T r a n s m i s

s i o n S y s t e m s

h o u l d r e m a i n , i n E n g l a n d a n d W a l e s , b e l o w 1 % a n d

, i n

S c o t l a n d , b e l o w 2 % a n d O f f s h o r e w i l l b e d e f i n e d i n r e l e v a n t B i l a t e r a l A g r e e

m e n t . .

I n E n g l a n d

a n d W a l e s , m e a s u r e d i n f r e q u e n t s h o r t d u r a t i o n p e a k s i n P h a s e ( V o l t a g e )

U n b a l a n c

e s h o u l d n o t e x c e e d t h e m a x i m u m

v a l u e s t a t e d i n t h e B i l a t e r a l

A g r e e m e n t .

I n E n g l a n d

a n d W a l e s , m e a s u r e d v o l t a g e f l u c t u a t i o n s a t t h e P o i n t o f C o m m o n

C o u p l i n g

s h a l l n o t e x c e e d 1 % o f t h e v o l t a g

e l e v e l f o r s t e p c h a n g e s . M e a s u r e d

v o l t a g e e x

c u r s i o n s o t h e r t h a n s t e p c h a n g e s

m a y b e a l l o w e d u p t o a l e v e l o f 3

% .

I n S c o t l a n d , m e a s u r e d v o l t a g e f l u c t u a t i o n s a t a P o i n t o f C o m m o n C o u p l i n g

s h a l l

n o t e x c e e d t h e l i m i t s s e t o u t i n E n g i n e e r i n g

R e c o m m e n d a t i o n P 2 8 .

M e a s u r e d

v o l t a g e f l u c t u a t i o n s a t a P o i n t o f

C o m m o n C o u p l i n g s h a l l n o t e x c e e d , f o r

v o l t a g e s a

b o v e 1 3 2 k V , F l i c k e r S e v e r i t y ( S h o r t T e r m ) o f 0 . 8 U n i t a n d F l i c k e

r

S e v e r i t y (

L o n g T e r m ) o f 0 . 6 U n i t , a n d , f o r

v o l t a g e s a t 1 3 2 k V a n d b e l o w , s h a

l l n o t

e x c e e d F l i c k e r S e v e r i t y ( S h o r t T e r m ) o f 1 . 0 U n i t a n d F l i c k e r S e v e r i t y ( L o n

g T e r m )

o f 0 . 8 U n i t , a s s e t o u t i n E n g i n e e r i n g R e c o

m m e n d a t i o n P 2 8 a s c u r r e n t a t t h

e

T r a n s f e r D a t e .

G r i d C o d e

R e f e r e n c e

C C . 6 . 1 . 5 ( a )

C C . 6 . 1 . 5 ( b )

C C . 6 . 1 . 6

C C . 6 . 1 . 7 ( a )

C C . 6 . 1 . 7 ( b )

P a r a m e t e r

t o b e

T e s t e d

H a r m o n i c

C o n t e n t

P h a s e

U n b a l a n c e

P h a s e

U n b a l a n c e

V o l t a g e

F l u c t u a t i o n

s

F l i c k e r

T h e p a s s c r i t e r i a

m u s t b e r e a d i n c o n j u n c t i o n w i t h

t h e f u l l t e x t u n d e r t h e G r i d C o d e r e f e r e n c e . T h e B M U n i t , C C G T M

o d u l e ,

P o w e r P a r k M o d u l e o r G e n e r a t i n g U n i t ( e x c l u d i n g P o w e r P a r k U n i t s ) w i l l p a s s t h

e t e s t i f t h e c r i t e r i a b e l o w a r e m e t :

Voltage Quality



Issue 4 OC5 - 9 24 June 2009

P a s s

C r i t e r i a

( t o b e r e a d i n c o n j u n c t i o n w i t h t h e f

u l l t e x t u n d e r t h e G r i d C o d e r e f e r e n c e )

O f f s h o r e , m e a s u r e d v o l t a g e f l u c t u a t i o n s

a t t h e P o i n t o f C o m m o n C o u p l i n g s h a l l

n o t e x c e e d t h e l i m i t s s e t o u t i n t h e B i l a t e

r a l A g r e e m e n t .

T h e f a u

l t c l e a r a n c e t i m e s s h a l l b e i n a c c o

r d a n c e w i t h t h e B i l a t e r a l A g r e e m

e n t .

T h e B a c k - U p P r o t e c t i o n s y s t e m p r o v i d e

d b y G e n e r a t o r s o p e r a t e s i n t h e

t i m e s

s p e c i f i e

d i n C C . 6 . 2 . 2 . 2 . 2 ( b ) .

T h e B a c k - U p P r o t e c t i o n s y s t e m p r o v i d e

d b y N e t w o r k O p e r a t o r s a n d N o

n -

E m b e d

d e d C u s t o m e r s o p e r a t e s i n t h e t i m e s s p e c i f i e d i n C C . 6 . 2 . 3 . 1 . 1 ( b ) a n d w i t h

D i s c r i m

i n a t i o n a s s p e c i f i e d i n t h e B i l a t e

r a l A g r e e m e n t .

T h e c i r c

u i t b r e a k e r f a i l P r o t e c t i o n s h a l l i n i t i a t e t r i p p i n g s o a s t o i n t e r r u p t t h

e f a u l t

c u r r e n t

w i t h i n 2 0 0 m s .

T h e G e

n e r a t i n g U n i t , D C C o n v e r t e r o r

P o w e r P a r k M o d u l e w i l l p a s s t h e

t e s t i f i t i s

w i t h i n ±

5 % o

f t h e r e a c t i v e c a p a b i l i t y r e g i s t e r e d w i t h N G E T u n d e r O C 2 w h i c h s h a l l

m e e t t h

e r e q u i r e m e n t s s e t o u t i n C C . 6 . 3 . 2 .

T h e d u r a t i o n o f t h e t e s t w i l l b e f o r a p e r i o

d o f u p t o 6 0 m i n u t e s d u r i n g w h i c h p e r i o d

t h e S y s

t e m v o l t a g e a t t h e G r i d E n t r y P o

i n t f o r t h e r e l e v a n t G e n e r a t i n g U

n i t , D C

C o n v e r

t e r o r P o w e r P a r k M o d u l e w i l l b e m a i n t a i n e d b y t h e G e n e r a t o r a t

t h e

v o l t a g e

s p e c i f i e d p u r s u a n t t o B C 2 . 8 b y a d j u s t m e n t o f R e a c t i v e P o w e r o n t h e

r e m a i n i n g G e n e r a t i n g U n i t s , D C C o n v e

r t e r s o r P o w e r P a r k M o d u l e s , i f n e c e s s a r y .

A n y t e s t p e r f o r m e d i n r e s p e c t o f a n E m b e d d e d M e d i u m P o w e r S t a t i o n n o t s u b j e c t

t o a B i l a t e r a l A g r e e m e n t o r , a n E m b e d d e d

D C C o n v e r t e r S t a t i o n n o t s u b j e c t t o a

B i l a t e r a l A g r e e m e n t s h a l l b e a s c o n f i r m e d p u r s u a n t t o O C 5 . 8 . 3 .

M e a s u r e m e n t s o f t h e R e a c t i v e P o w e r o u t p u t u n d e r s t e a d y s t a t e c o n d i t i o n

s s h o u l d

b e c o n s

i s t e n t w i t h G r i d C o d e r e q u i r e m e n

t s i . e . f u l l y a v a i l a b l e w i t h i n t h e v o l t a g e r a n g e

± 5 % a

t 4 0 0 k V ,

2 7 5 k V a n d 1 3 2 k V a n d l o w e r v o l t a g e s .

G r i d C o d e

R e f e r e n c e

C C . 6 . 1 . 8

C C . 6 . 2 . 2 . 2 . 2 ( a )

C C . 6 . 2 . 3 . 1 . 1 ( a )

C C . 6 . 2 . 2 . 2 . 2 ( b )

C C . 6 . 2 . 3 . 1 . 1 ( b )

C C . 6 . 2 . 2 . 2 . 2 ( c )

C C . 6 . 2 . 3 . 1 . 1 ( c )

C C . 6 . 3 . 2

C C . 6 . 3 . 4

P a r a m e t e r t o b e

T e s t e d

V o l t a g e

F l u c t u a t i o n s

F a u l t C l e a r a n c e

T i m e s

B a c k - U p

P r o t e c t i o n

C i r c u i t B r e a k e r

f a i l

P r o t e c t i o n

R e a c t i v e C a p a b i l i t y

Fault Clearance Reactive Capability



Issue 4 OC5 - 11 24 June 2009

P a s s

C r i t e r i a

( t o b e r e a d i n c o n j u n c t i o n w i t h t h e f

u l l t e x t u n d e r t h e G r i d C o d e r e f e r e n c e )

T h e F a s t S t a r t C a p a b i l i t y r e q u i r e m e n t s o f t h e A n c i l l a r y S e r v i c e s A g r e e m

e n t f o r

t h a t G e n s e t a r e m e t .

T h e r e l e v a n t G e n e r a t i n g U n i t o r P o w e r

P a r k M o d u l e i s S y n c h r o n i s e d t o

t h e

S y s t e m

w i t h i n t w o h o u r s o f t h e A u x i l i a r y

G a s T u r b i n e ( s ) o r A u x i l i a r y D i e

s e l

E n g i n e

( s ) b e i n g r e q u i r e d t o s t a r t .

M e a s u r e m e n t s o f t h e c o n t i n u o u s l y a c t i n g

a u t o m a t i c e x c i t a t i o n c o n t r o l s y s t e m a r e

r e q u i r e d t o d e m o n s t r a t e t h e p r o v i s i o n o f :

( i ) c o n s t a n t t e r m i n a l v o l t a g e c o n t r o l ; o r

( i i ) z e r o

M V A r t r a n s f e r ; o r ,

( i i i ) v o l t a g e c o n t r o l w i t h a S l o p e

o f t h e G e n e r a t i n g U n i t , D C C o n v e r t e r o

r P o w e r P a r k M o d u l e a s a p p l i c a

b l e w i t h o u t

i n s t a b i l i t y o v e r t h e e n t i r e o p e r a t i n g r a n g e

o f t h e G e n e r a t i n g U n i t , D C C o n

v e r t e r o r

P o w e r P a r k M o d u l e . T h e m e a s u r e d p e r f o r m a n c e o f t h e a u t o m a t i c e x c i t a t i o n o r

v o l t a g e

c o n t r o l s y s t e m s h o u l d a l s o m e e t t h e r e q u i r e m e n t s ( i n c l u d i n g P o w e

r S y s t e m

S t a b i l i s

e r p e r f o r m a n c e ) s p e c i f i e d i n t h e B i l a t e r a l A g r e e m e n t o r a n y r e q u i r e m e n t s

S p e c i f i e

d i n a n E m b e d d e d D e v e l o p m e n

t A g r e e m e n t .

G r i d C o d e

R e f e r e n c e

O C . 5 . 7 . 1

C C . 6 . 3 . 8 ( a )

( b ) &

B C 2 . 1 1 . 2

P a r a m e t e r t o b e

T e s t e d

F a s t S t a r t

B l a c k S t a r t

E x c i t a t i o n

S y s t e m /

V o l t a g e C o n t r o

l



Issue 4 OC5 - 12 24 June 2009

P a s s C r i t e r i a

T h e E x p o r t a n d I m p o r t L i m i t s , Q P N , J

o i n t B M U n i t D a t a a n d D y n a m i c

P a r a m

e t e r s u n d e r t e s t a r e w i t h i n 2 ½ % o f t h e d e c l a r e d v a l u e b e i n g t e s t e d

.

T h e d u

r a t i o n o f t h e t e s t w i l l b e c o n s i s t e n

t w i t h a n d s u f f i c i e n t t o m e a s u r e t h e r e l e v a n t

e x p e c t e d i n p u t o r o u t p u t d e r i v e d f r o m t h

e F i n a l P h y s i c a l N o t i f i c a t i o n D a

t a a n d

B i d - O f f e r A c c e p t a n c e s i s s u e d u n d e r B

C 2 w h i c h a r e s t i l l i n d i s p u t e f o l l o w

i n g t h e

p r o c e d

u r e i n O C 5 . 4 . 2 .

S y n c h

r o n i s a t i o n t a k e s p l a c e w i t h i n ± 5

m i n u t e s o f t h e t i m e i t s h o u l d h a v e

a c h i e v e d

S y n c h

r o n i s a t i o n .

T h e d u





t a a n d



i n g t h e

p r o c e d

u r e i n O C 5 . 4 . 2 .

A c h i e v

e s t h e i n s t r u c t e d o u t p u t a n d , w h e

r e a p p l i c a b l e , t h e f i r s t a n d / o r s e c o n d

i n t e r m e d i a t e b r e a k p o i n t s , e a c h w i t h i n ± 3

m i n u t e s o f t h e t i m e i t s h o u l d h a v

e r e a c h e d

s u c h o

u t p u t a n d b r e a k p o i n t s f r o m S y n c h r o n i s a t i o n ( o r b r e a k p o i n t , a s t h e c a s e

m a y b e ) , c a l c u l a t e d f r o m t h e r u n - u p r a t e

s i n i t s D y n a m i c P a r a m e t e r s .

T h e d u





t a a n d



i n g t h e

p r o c e d

u r e i n O C 5 . 4 . 2 .

A c h i e v

e s t h e i n s t r u c t e d o u t p u t w i t h i n ± 5

m i n u t e s o f t h e t i m e , c a l c u l a t e d f r o m t h e

r u n - d o

w n r a t e s i n i t s D y n a m i c P a r a m e t

e r s .

T h e d u





t a a n d



i n g t h e

p r o c e d

u r e i n O C 5 . 4 . 2 .

G r i d C o d e

R e f e r e n c e

O C 5

B C 2 . 5 . 2 . 3

O C 5

O C 5

P a r a m e

t e r t o b e

T e s t e d

E x p o r t

a n d

I m p o r t

L i m i t s ,

Q P N , J o i n t B M

U n i t D a

t a a n d

D y n a m

i c

P a r a m e

t e r s

S y n c h r

o n i s a t i o n

t i m e

R u n - u p

r a t e s

R u n - d o w n r a t e s

Dynamic Parameters

Due account will be taken of any conditions on the System which may affect the results of thetest. The relevant User must, if requested, demonstrate, to NGET's reasonable satisfaction,the reliability of the suitable recorders, disclosing calibration records to the extent appropriate.



Issue 4 OC5 - 13 24 June 2009

OC5.5.4 Test Failure/Re-test

If the BM Unit, CCGT Modules, Power Park Module or Generating Unit (excluding Power Park Units) concerned fails to pass the test the User mustprovide NGET with a written report specifying in reasonable detail the reasonsfor any failure of the test so far as they are then known to the User after dueand careful enquiry. This must be provided within five Business Days of thetest. If a dispute arises relating to the failure, NGET and the relevant User shallseek to resolve the dispute by discussion, and, if they fail to reach agreement,the User may by notice require NGET to carry out a re-test on 48 hours' noticewhich shall be carried out following the procedure set out in OC5.5.2 andOC5.5.3 and subject as provided in OC5.5.1.3, as if NGET had issued aninstruction at the time of notice from the User.

OC5.5.5 Dispute following Re-test

If the BM Unit, CCGT Module, Power Park Module or Generating Unit

(excluding Power Park Units) in NGET's view fails to pass the re-test and adispute arises on that re-test, either party may use the Disputes ResolutionProcedure for a ruling in relation to the dispute, which ruling shall be binding.

OC5.6 DISPUTE RESOLUTION

OC5.6.1 If following the procedure set out in OC5.5 it is accepted that the BM Unit,CCGT Module, Power Park Module or Generating Unit (excluding PowerPark Units) has failed the test or re-test (as applicable), the User shall within14 days, or such longer period as NGET may reasonably agree, following suchfailure, submit in writing to NGET for approval the date and time by which theUser shall have brought the BM Unit concerned to a condition where itcomplies with the relevant requirement. NGET will not unreasonably withhold or

delay its approval of the User’s proposed date and time submitted. ShouldNGET not approve the User’s proposed date or time (or any revised proposal),the User should amend such proposal having regard to any comments NGET may have made and re-submit it for approval.

OC5.6.2 If a BM Unit fails the test, the User shall submit revised Export and ImportLimits, QPN, Joint BM Unit Data and/or Dynamic Parameters, or in the caseof a BM Unit comprising a Generating Unit, CCGT Module, DC Converter or Power Park Module, the User may amend, with NGET's approval, the relevantregistered parameters of that Generating Unit, CCGT Module, DC Converteror Power Park Module, as the case may be, relating to the criteria, for theperiod of time until the BM Unit can achieve the parameters previouslyregistered, as demonstrated in a re-test.

OC5.6.3 Once the User has indicated to NGET the date and time that the BM Unit,CCGT Module, Power Park Module or Generating Unit (excluding PowerPark Units) can achieve the parameters previously registered or submitted,NGET shall either accept this information or require the User to demonstratethe restoration of the capability by means of a repetition of the test referred to inOC5.5.2 by an instruction requiring the User on 48 hours notice to carry outsuch a test. The provisions of this OC5.6 will apply to such further test.



Issue 4 OC5 - 14 24 June 2009

OC5.7 BLACK START TESTING

OC.5.7.1 General

(a) NGET may require a Generator with a Black Start Station to carryout a test (a "Black Start Test") on a Genset in a Black Start Station either while the Black Start Station remains connected to an externalalternating current electrical supply (a "BS Unit Test") or while theBlack Start Station is disconnected from all external alternatingcurrent electrical supplies (a "BS Station Test"), in order todemonstrate that a Black Start Station has a Black Start Capability.

(b) Where NGET requires a Generator with a Black Start Station tocarry out a BS Unit Test, NGET shall not require the Black StartTest to be carried out on more than one Genset at that Black StartStation at the same time, and would not, in the absence ofexceptional circumstances, expect any of the other Genset at the

Black Start Station to be directly affected by the BS Unit Test.

(c) NGET may require a Generator with a Black Start Station to carryout a BS Unit Test at any time (but will not require a BS Unit Test tobe carried out more than once in each calendar year in respect of anyparticular Genset unless it can justify on reasonable grounds thenecessity for further tests or unless the further test is a re-test, and willnot require a BS Station Test to be carried out more than once inevery two calendar years in respect of any particular Genset unless itcan justify on reasonable grounds the necessity for further tests orunless the further test is a re-test).

(d) When NGET wishes a Generator with a Black Start Station to carry

out a Black Start Test, it shall notify the relevant Generator at least 7days prior to the time of the Black Start Test with details of theproposed Black Start Test.

OC.5.7.2 Procedure for a Black Start Test

The following procedure will, so far as practicable, be carried out in thefollowing sequence for Black Start Tests:

OC.5.7.2.1 BS Unit Tests

(a) The relevant Generating Unit shall be Synchronised and Loaded;

(b) All the Auxiliary Gas Turbines and/or Auxiliary Diesel Engines in theBlack Start Station in which that Generating Unit is situated, shall beShutdown.

(c) The Generating Unit shall be De-Loaded and De-Synchronised and allalternating current electrical supplies to its Auxiliaries shall bedisconnected.

(d) The Auxiliary Gas Turbine(s) or Auxiliary Diesel Engine(s) to therelevant Generating Unit shall be started, and shall re-energise the UnitBoard of the relevant Generating Unit.



Issue 4 OC5 - 15 24 June 2009

(e) The Auxiliaries of the relevant Generating Unit shall be fed by theAuxiliary Gas Turbine(s) or Auxiliary Diesel Engine(s), via the UnitBoard, to enable the relevant Generating Unit to return toSynchronous Speed.

(f) The relevant Generating Unit shall be Synchronised to the System butnot Loaded, unless the appropriate instruction has been given by NGET under BC2.

OC.5.7.2.2 BS Station Test

(a) All Generating Units at the Black Start Station, other than theGenerating Unit on which the Black Start Test is to be carried out, andall the Auxiliary Gas Turbines and/or Auxiliary Diesel Engines at theBlack Start Station, shall be Shutdown.

(b) The relevant Generating Unit shall be Synchronised and Loaded.

(c) The relevant Generating Unit shall be De-Loaded and De--Synchronised.

(d) All external alternating current electrical supplies to the Unit Board of therelevant Generating Unit, and to the Station Board of the relevantBlack Start Station, shall be disconnected.

(e) An Auxiliary Gas Turbine or Auxiliary Diesel Engine at the BlackStart Station shall be started, and shall re-energise either directly, or viathe Station Board, the Unit Board of the relevant Generating Unit.

(f) The provisions of OC.5.7.2.1 (e) and (f) shall thereafter be followed.

OC.5.7.2.3 All Black Start Tests shall be carried out at the time specified by NGET in thenotice given under OC5.7.1(d) and shall be undertaken in the presence of areasonable number of representatives appointed and authorised by NGET,who shall be given access to all information relevant to the Black Start Test.

OC.5.7.2.4 Failure of a Black Start Test

A Black Start Station shall fail a Black Start Test if the Black Start Test shows that it does not have a Black Start Capability (ie. if the relevantGenerating Unit fails to be Synchronised to the System within two hours ofthe Auxiliary Gas Turbine(s) or Auxiliary Diesel Engine(s) being required tostart).

OC.5.7.2.5 If a Black Start Station fails to pass a Black Start Test the Generator mustprovide NGET with a written report specifying in reasonable detail the reasonsfor any failure of the test so far as they are then known to the Generator afterdue and careful enquiry. This must be provided within five Business Days ofthe test. If a dispute arises relating to the failure, NGET and the relevantGenerator shall seek to resolve the dispute by discussion, and if they fail to



Issue 4 OC5 - 16 24 June 2009

reach agreement, the Generator may require NGET to carry out a furtherBlack Start Test on 48 hours notice which shall be carried out following theprocedure set out in OC.5.7.2.1 or OC.5.7.2.2 as the case may be, as if NGET had issued an instruction at the time of notice from the Generator.

OC.5.7.2.6 If the Black Start Station concerned fails to pass the re-test and a disputearises on that re-test, either party may use the Disputes ResolutionProcedure for a ruling in relation to the dispute, which ruling shall be binding.

OC.5.7.2.7 If following the procedure in OC.5.7.2.5 and OC.5.7.2.6 it is accepted that the Black Start Station has failed the Black Start Test (or a re-test carried outunder OC.5.7.2.5), within 14 days, or such longer period as NGET mayreasonably agree, following such failure, the relevant Generator shall submitto NGET in writing for approval, the date and time by which that Generator shall have brought that Black Start Station to a condition where it has a BlackStart Capability and would pass the Black Start Test, and NGET will notunreasonably withhold or delay its approval of the Generator's proposed date

and time submitted. Should NGET not approve the Generator's proposeddate and time (or any revised proposal) the Generator shall revise suchproposal having regard to any comments NGET may have made and resubmitit for approval.

OC.5.7.2.8 Once the Generator has indicated to NGET that the Generating Station has aBlack Start Capability, NGET shall either accept this information or requirethe Generator to demonstrate that the relevant Black Start Station has itsBlack Start Capability restored, by means of a repetition of the Black StartTest referred to in OC5.7.1(d) following the same procedure as for the initialBlack Start Test. The provisions of this OC.5.7.2 will apply to such test.

OC.5.8 PROCEDURES APPLYING TO EMBEDDED MEDIUM POWER STATION

NOT SUBJECT TO A BILATERAL AGREEMENT AND EMBEDDED DCCONVERTER STATIONS NOT SUBJECT TO A BILATERAL AGREEMENT

OC5.8.1 Compliance Statement

Each Network Operator shall ensure that each Embedded Person provides tothe Network Operator upon NGET's request:

(a) written confirmation that each such Generating Unit, Power ParkModule or DC Converter complies with the requirements of the CC;and

(b) evidence, where requested, reasonably satisfactory to NGET, of such

compliance. Such a request shall not normally be made by NGET morethan twice in any calendar year in respect of any Generator’s Generating Unit or Power Park Module or DC Converter owner's DCConverter.

The Network Operator shall provide the evidence or written confirmationrequired under OC5.8.1 (a) and (b) forthwith upon receipt to NGET.



Issue 4 OC5 - 17 24 June 2009

OC5.8.2 Network Operator’s Obligations to Facilitate Tests

If:

(a) the Network Operator fails to procure the confirmation referred to atOC5.8.1(a); or

(b) the evidence of compliance is not to NGET’s reasonable satisfaction,

then, NGET shall be entitled to require the Network Operator to procureaccess upon terms reasonably satisfactory to NGET to enable NGET to witnessthe Embedded Person carrying out the tests referred to in OC5.8.3 in respectof the relevant Embedded Medium Power Station or Embedded DCConverter Station.

OC5.8.3 Testing of Embedded Medium Power Stations not subject to a Bilateral

Agreement or Embedded DC Converter Stations not subject to a BilateralAgreement

NGET may, in accordance with the provisions of OC5.8.2, at any time (althoughnot normally more than twice in any calendar year in respect of any particularEmbedded Medium Power Station not subject to a Bilateral Agreement orEmbedded DC Converter Station not subject to a Bilateral Agreement)issue an instruction requiring the Network Operator within whose System therelevant Medium Power Station not subject to a Bilateral Agreement or DCConverter Station not subject to a Bilateral Agreement is Embedded, torequire the Embedded Person to carry out a test.

Such test shall be carried out at a time no sooner than 48 hours from the time

that the instruction was issued, on any one or more of the Generating Units,Power Park Module or DC Converter comprising part of the relevantEmbedded Medium Power Station or Embedded DC Converter Station andshould only be to demonstrate that:

(a) the relevant Generating Unit, Power Park Module or DC Converter meets the requirements of the paragraphs in the CC which are applicableto such Generating Units, Power Park Module or DC Converter;

(b) the Reactive Power capability registered with NGET under OC2 meetsthe requirements set out in CC.6.3.2.

The instruction may only be issued where, following consultation with the

relevant Network Operator, NGET has:

(a) confirmed to the relevant Network Operator the manner in which the testwill be conducted, which shall be consistent with the principlesestablished in OC5.5.2; and

(b) received confirmation from the relevant Network Operator that therelevant Generating Unit, Power Park Module or DC Converter wouldnot then be unavailable by reason of forced outage or Planned Outage expected prior to the instruction.



The relevant Network Operator is responsible for ensuring the performance ofany test so required by NGET and the Network Operator shall ensure that theEmbedded Person retains the responsibility for ensuring the safety ofpersonnel and plant during the test.

OC5.8.4 Test Failures/Re-tests and Disputes

The relevant Network Operator shall:

(a) ensure that provisions equivalent to OC5.5.4, OC5.5.5 and OC5.6 applyto Embedded Medium Power Stations not the subject of a BilateralAgreement or Embedded DC Converter Stations not the subject of aBilateral Agreement within its System in respect of test failures, re-testsand disputes as to test failures and re-tests;

(b) ensure that the provisions equivalent to OC5.5.4, OC5.5.5 and OC5.6referred to in OC5.8.4(a) are effective so that NGET may require, if it sowishes, the provision to it of any reports or other information equivalent to

those or that to which NGET would be entitled in relation to test failures,re-tests and disputes as to test failures and re-tests under the provisionsof OC5.5.4, OC5.5.5 and OC5.6; and

(c) the provisions equivalent to OC5.5.4, OC5.5.5 and OC5.6 referred to inOC5.8.4(a) are effective to permit NGET to conduct itself and takedecisions in such a manner in relation to test failures, re-tests anddisputes as to test failures and re-tests in respect of Embedded MediumPower Stations not the subject of a Bilateral Agreement or EmbeddedDC Converter Stations not the subject of a Bilateral Agreement as it isable to conduct itself and take decisions in relation to test failures, re-testsand disputes as to test failures and re-tests under OC5.5.4, OC5.5.5 andOC5.6.

<End of OC5>

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