mos investigate avr & cbf relay

TNB 320/2013 TNBT 804913

T+ 9+

KERJA –KERJA ESTABLISHMENT OF PMU 275/33KV HULU TERENGGANU, TERENGGANU.

METHOD STATEMENT FOR:

Investigation on AVR Relay Faulty & Alarm for Breaker Failure Relay

CONTRACTOR

CD ELECTRICAL ENGINEERING SDN. BHD. – TRANSGRID VENTURES SDN. BHD. JOINT VENTURES

E-07-3, EAST WING BUSINESS PARK, SUBANG SQUARE, JALAN SS15/4G,

47050 SUBANG JAYA, SELANGOR D.E. TEL NO: 03-56219624 FAX NO: 03-56219752

Prepared by Check by Verified by Approved by

(ABDUL HADI MOHAMAD) CDEE-TGV JV

( ) Competent Engineer

( ) Engineer /Senior Engineer MP

( ) State Manager AM

TENAGA NASIONAL BERHAD

METHOD STATEMENT

CONTRACT NO.: TNB 320/2013 TENDER NO.: TNBT 804913

METHOD STATEMENT

Investigation on AVR Relay Faulty and Alarm for Breaker Failure Relay

Project Title : Kerja-kerja Establishment of PMU 275/33kV Hulu Terengganu, Terengganu

Substation : PMU 275/33kV Hulu Terengganu Bay : RTCC No.1 (EH+RT1)

275kV Bus Coupler (D04+R) Revision : 0 Date : 23-04-2015

METHOD STATEMENT

CLIENT: TENAGA NASIONAL BERHAD TENDER NO.: TNBT 804913

CONTRACT NO.: TNB 320/2013 SUBSTATION: PMU 275/33kV HULU TERENGGANU OBJECTIVES To investigate on the issues:

1. Siemens Microtapp AVR Relay at DH+RT1 (RTCC No 1) is not functioning well during paralleling with T2. In Auto Mode, when TPI is low, Raise command in AVR is malfunction

2. Alarm_Presist10 at Breaker Failure Relay (NARI RCS 921) for Bus Coupler bay D04+R occurred due to Neutral Current is higher than other phase

PANEL RELATED

Based on the issues: 1. 275/33kV, 45MVA RTCC No 1 (DH+RT1) 2. 275kV Bus Coupler Relay Panel (D04+R)

STAFF LIST

Please refer to Appendix A. RISK ANALYSIS Please refer to Appendix B. WORK SCHEDULE Please refer to Appendix C. TOOLS Wiring tool, multimeter and drilling machine. ISOLATION AND TERMINATION LIST

Please refer to Appendix D. WORK PROCEDURE Please refer to Appendix D. CONTINGENCY PLAN Please refer to Appendix E. ITEM TO DISMANTLE AND INSTALL

No. Item To Dismantle Item To Install 1 Faulty AVR Relay

SIEMENS MICROTAPP New AVR Relay SIEMENS MICROTAPP

2 Faulty NARI RCS 921 Breaker Failure Relay New NARI RCS 921 Breaker Failure Relay Item dismantle are based on investigation, if the relay are faulty PSI will replace the faulty relay

PREPARED BY: SUFYAN KADIR DATE: 23.04.15

CHECK BY: MOHD NASIR BIN JAAFAR

METHOD STATEMENT


CONTRACT NO.: TNB 320/2013 SUBSTATION: PMU 275/33kV HULU TERENGGANU

APPENDIX A STAFF LIST No. Name NRIC No. NIOSH No. NIOSH

Validity Date CIDB

Validity Date 1. Mohd Dalim Bin Yatim 730215-11-5329 TNB000885N 27/03/2017 05/03/2015

2. Mohd Ridzuan Bin Abu Hasan 900823-07-5913 TNB019618N 31/07/2015 05/11/2015

3. Muhammad Sufyan B Abd Kadir 900722-14-5003 TNB025993N 26/09/2016 76/06/2016

4. Saiful Azam Bin Samsuri 790102-14-5403 TNB001443N 14/ 08/2017 06/06/2016

5. Shahril Apipie Bin Mokhtar 900217-03-5997 TNB025993N 10/10/2016 06/05/2016

6. Ahmad Imaduddin Bin Zul Azman 850323-71-5053 TNB002026N 7/1/2018 6/5/2015

This is to certify that above listed personnel have been appointed to perform the site works such as dismantling works, panel cut out, wiring and termination works until cancellation of permit to work (PTW). The person above may vary depending on availability on the said work and day.



METHOD STATEMENT





METHOD STATEMENT


CONTRACT NO.: TNB 320/2013 SUBSTATION: PMU 275/33kV HULU TERENGGANU APPENDIX B RISK ANALYSIS /METHOD OF CONTROL Note: ESE and TNB need to double check and confirm before allowed any termination to be done. Work can be done only during outage and only TNB can decide either the work could be carryout without outage with direct TNB AM supervision. DESCRIPTION

OF ACTIVITIES HAZARD

IDENTIFICATIONS METHOD OF CONTROL PERSON IN CHARGE REMARKS

PTW issuance by TNB AP

PERSONAL 1. Misunderstanding Scope

of Work 2. Working at wrong

equipment

PERSONAL 1. TNB AP will conduct safety briefing

followed by site supervisor 2. Conduct pre-job meeting with TNB 3. Discuss scope of work with TNB and

team member 4. Refer to Method of Statement and

Isolation Checklist if not clear about scope of work

5. To use barricade tape & “WORK IN PROGRESS” signboard at working area

TNB & Contractor

Isolation DC and AC supply at control and relay panels.

APPARATUS 1. Wrong wiring will

damage the equipment and can cause MCB to trip.

2. Improper wiring can cause cable leakage.

APPARATUS 1. Confirm the type of circuits that are

going to terminate / remove. 2. All work must monitor by TNB AP/CP

and authorize person appointed by ESE. 3. Confirm the device involve with circuit

DC and the rated voltage.

TNB & Contractor

PERSONAL 1. DC or AC leak will

cause the electrical shock.

2. Flash over or sparking will cause burn if wrong terminations during normalize or commissioning.

PERSONAL 1. Tester should be available to check

insulation and continuity test.

SYSTEM 1. Tripping to existing bay. 2. Interrupt existing bay

system. 3. DC earth fault at the

system. 4. Wrong bay or terminal

will interrupt the existing system.

SYSTEM 1. Contractor must study and understand

the circuits before start work and to ensure TNB AP/CP aware of the work.

2. Isolate any live circuit will do by PSI or wireman under direct supervise.

3. Only Tester allow to ON/OFF the MCB. 4. Wires hanging are not allowed unless it

was due to some circumstances. 5. Testers have to measure before and after

work completed



METHOD STATEMENT



Dismantle items at control and relay panels

SYSTEM 1. High potential of DC

Earth Fault / DC Short Circuit if the supply is not totally isolate

2. High potential of tripping not totally isolate

SYSTEM 1. Prior to dismantling works, wireman/

engineer in charge need to measure all terminal blocks to ensure that there are no supply

2. Dismantling of wires shall be carried out with extra cautious in order to avoid dismantling the wrong wires. TNB &

Contractor

PERSONAL 1. Dismantled wrong items

PERSONAL 1. Wireman need to confirm with engineer

in charge and TNB AP/CP if there are uncertainties.

2. Wireman shall refer to the approved drawing prior to dismantling items at control and relay panels.

Install new items at control and relay panels

PERSONAL 1. Wrong installation may

lead to wrong termination

PERSONAL 1. Prior to installation, all necessary wiring

has been done during pre-outage work 2. Wiring check shall be carried out before

installation to avoid wrong termination 3. The location to install shall refer to

approved conceptual drawings. 4. Wireman need to confirm with engineer

in charge and TNB AP/CP if there are some uncertainties.

5. Proper labeling to the installed items to avoid wrong wiring and termination

TNB & Contractor

Wiring and termination at control and relay panels

SYSTEM 1. Termination at wrong

location may lead to unwanted alarm coming out or in worst case may cause tripping

2. In proper termination may cause sparking or DC Earth Fault during testing and commissioning

SYSTEM 1. Termination location shall be refer to

related schematic drawing 2. Wireman need to confirm with engineer

in charge and TNB AP/CP if there are some uncertainties to the related drawing.

3. Proper tools and cable lugs are to be used and wires shall be terminated properly.

TNB & Contractor

PERSONAL 1. Wiring and termination at

wrong devices

PERSONAL 1. Wiring and termination shall be carried

out by competent wireman.

Wiring Check and Rectification Works

SYSTEM 1. Control and simulation to

wrong device. 2. Wrong polarity for

positive and negative connection.

3. Wrong termination of wire and looping.

4. In-proper connection of wiring

SYSTEM 1. To perform continuity tests and verify

with TNB. 2. Conduct wiring check with TNB AP/CP

to confirm the wiring are correct. 3. Determine positive and negative using

multimeter and verify with TNB AP/CP 4. All wiring shall be properly terminated

using appropriate tools.

TNB & Contractor



METHOD STATEMENT

CONTRACT NO.: TNB 320/2013 TENDER NO.: TNBT 804913

WORK SCHEDULE

No. WORK DESCRIPTION Day 1

Working Hours 1 2 3 4 5 6 7 8 9

1 Obtain Permit to work

2. Investigation for RTCC Panel No. 1 (DH+RT1)

4. Isolation work at RTCC Panel No.1

5. RTCC Panel No.1 -Dismantling of faulty relay -Installation of new relay -Final Check -Handover to tester

Investigation for 275kV Bus Coupler Relay Panel (D04+R)

6. Isolation work for 275kV Bus Coupler Relay Panel (D04+R)

7. 275kV Bus Coupler Relay Panel (D04+R) -Dismantling of faulty relay -Installation of new relay -Final Check -Handover to tester

9. -Testing on going -Commissioning

METHOD STATEMENT


CONTRACT NO.: TNB 320/2013 SUBSTATION: PMU 275/33kV HULU TERENGGANU APPENDIX D WORK PROCEDURE AND ISOLATION CHECKLIST D1) WORK PROCEDURE

Step Activity Method Check Remarks

1. PTW application TNB will release PTW to ESE 2. Safety briefing Safety briefing before start work 3. Investigation Issues 1:

Siemens Microtapp AVR Relay at DH+RT1 (RTCC No 1) is not functioning well during paralleling with T2. In Auto Mode, when TPI is low, Raise command in AVR is malfunction. Issues 2: Alarm_Presist10 at Breaker Failure Relay (NARI RCS 921) for Bus Coupler bay D04+R occurred due to Neutral Current is higher than other phase. As per early investigation by TNB AM, Neutral current at NARI RCS 921 Breaker Failure is high. Current value for NARI relay. R phase = 0.096 amp secondary side, ( 384 amp) Y phase = 0.094 amp secondary side, (376 amp) B phase = 0.089 amp secondary side, (356 amp) N = 0.173 amp secondary side, (692 amp) Breaker Failure Relay is connected series with Backup Distance Protection Relay. Current value for the relay: R phase = 386.4 amp,angle 0 Y phase = 370.9amp, angle -114 B phase =359.0 amp, angle 135 N phase = 33.46 amp

4. Isolation work I. Measure Existing AC & DC power supply. (Please

refer Appendix D1: System DC Measurement)

II. Measurement and Isolation of DC Supply by MCB

and Terminal Block (Please refer Appendix D2:

Isolation Checklist)

III. Measurement and Isolation of CT Circuit (Please refer

to Appendix D3: Isolation List)



METHOD STATEMENT



IV. Check (measure) all terminal block after isolation. To

re-confirm all terminal blocks are isolated as per

Appendix D2 and D3)

5. Dismantle faulty

relay

Issues 1: To dismantle faulty Siemens Microtapp AVR relay at RTCC Panel No.1 (The dismantle are based on investigation result) Issues 2: To dismantle faulty NARI RCS 921 Breaker Failure relay at 275kV Bus Coupler (D04+R) (The dismantle are based on investigation result)

6. Install new relay Issues 1: To install new Siemens Microtapp AVR relay at RTCC Panel No.1 (The installation are based on investigation result) Issues 2: To install new NARI RCS 921 Breaker Failure relay at 275kV Bus Coupler (D04+R) (The installation are based on investigation result)

7. Wiring work To do wiring base on approved drawing. 8. Testing Hand-over to TNB tester



METHOD STATEMENT


CONTRACT NO.: TNB 320/2013 SUBSTATION: PMU 275/33kV HULU TERENGGANU PHYSICAL CHECKLIST A) Safety Precaution (Prior to work Commencement) 1. Check permit to work (PTW) has been issued. 2. Identify panels under the scope of work and hang “DANGER: WORK IN PROGRESS” sign. 3. Ensure that the rest of the adjacent panels other than described in above item 2 are barricade/locked to define working area clearly. B) Visual Check of Initial Condition Visual inspection of all panels under the scope of work to identify a. Any Bare Wire or Not terminated Wire YES NO b. Wire which is in the list to be isolated but has been isolated YES NO earlier c. Unknown wire in the terminal block YES NO No. Description Remarks



METHOD STATEMENT


CONTRACT NO.: TNB 320/2013 SUBSTATION: PMU 275/33kV HULU TERENGGANU SYSTEMS DC MEASUREMENT

No Description : Check Remarks

1.

Before work commence

Panel: _________________

Measure from terminal: _________ to ground

Measured value: ___________ VDC

Measurement from terminal: _________ to ground


Measure from terminal: _________ to terminal: _________


2. After wiring and cabling complete

Panel: _________________

Measure from terminal: _________ to ground


Measurement from terminal: _________ to ground


Measure from terminal: _________ to terminal: _________


***Measure system DC and record in above table. Identify if there is existence of substation DC earth fault. If found, inform to TNB AP of the finding.



METHOD STATEMENT


CONTRACT NO.: TNB 320/2013 SUBSTATION: PMU 275/33kV HULU TERENGGANU D2) ISOLATION LIST TYPE OF ISOLATION : Isolation of DC Supply BAY REFERENCE : 275/33kV, 45MVA RTCC No 1 (DH+RT1) 275kV Bus Coupler Relay Panel (D04+R) 1. Purpose of DC isolation

a. To avoid unnecessary short circuit to the human. b. To avoid unnecessary short circuit to the device or compartment. c. To avoid unnecessary MCB trip and effected to the system.

2. Observation

a. To isolate DC supply at RTCC Panel which related to AVR supply b. To isolate DC supply and tripping circuit for Breaker Failure Relay to Busbar Protection and other panels.

3. Action taken

a. To Switch OFF DC supply MCB at control and relay panel. b. Isolate terminal block slide link at relay panel.

Issues 1: Siemens Microtapp AVR Relay at DH+RT1 (RTCC No 1) is not functioning well during paralleling with T2. In Auto Mode, when TPI is low, Raise command in AVR is malfunction

Dwg. No & Sh Work Description Panel

Measured V.D.C. Device: Pin/

Wire Number

Wire No Before Isolate

After Isolated Normalized

DWG. NO. HTGU-275-PSI-36329-S-6004

To Measure and Turn OFF MCB –F72/3 (AVR Power Source)

DH+RT1 N101 V V V

N102 V V V

Issues 2: Alarm_Presist10 at Breaker Failure Relay (NARI RCS 921) for Bus Coupler bay D04+R occurred due to Neutral Current is higher than other phase

Dwg. No & Sh Work Description Panel

Measured V.D.C. Device: Pin/

Wire Number

Wire No Before Isolate After

Isolated Normalized

DWG. NO. HTGU-275-PSI-36329-S-5208 SH 41

To Measure and Turn OFF MCB –F72/1 (Protection 1 DC Supply)

D04+R XP1:23 P101 V V V

XP1:29 P102 V V V


To Measure and Isolate Terminal Block/ Remove Trip Link -XT29 for CBF Stage 2 Operated to Busbar Protection Main Zone

D04+R

XP1: 41 P1 V V V

XP1: 42 P17M/D04 V V V


To Measure and Isolate Terminal Block/ Remove Trip Link –XT30 for CBF Stage 2 Operated to Busbar

D04+R XP1: 43 P1/D04 V V V

XP1: 44 P17R/D04 V V V



METHOD STATEMENT



Protection Reserve Zone


To Measure and Isolate Terminal Block/ Remove Trip Link –XT31 for CBF Stage 2 Operated to Busbar Protection Check Zone

D04+R

XP1: 45 P16C V V V

XP1: 46 P2 V V V



METHOD STATEMENT





METHOD STATEMENT


CONTRACT NO.: TNB 320/2013 SUBSTATION: PMU 275/33kV HULU TERENGGANU D3) ISOLATION LIST TYPE OF ISOLATION : Isolation of CT & VT Circuit BAY REFERENCE : 275/33kV, 45MVA RTCC No 1 (DH+RT1) 275kV Bus Coupler Relay Panel (D04+R) 1. Purpose of isolation

a. To avoid unnecessary short circuit to the human. b. To avoid unnecessary short circuit to the device or compartment. c. To avoid unnecessary effected to the system.

2. Observation

a. To isolate CT & VT at RTCC Panel which related to AVR supply b. To isolate CT supply and tripping circuit for Breaker Failure Relay to Busbar Protection and other panels.

3. Action taken

a. To shorting CT b. To isolate terminal block link or remove internal wire and tape

Issues 1: Siemens Microtapp AVR Relay at DH+RT1 (RTCC No 1) is not functioning well during paralleling with T2. In Auto Mode, when TPI is low, Raise command in AVR is malfunction

Dwg. No & Sh

Work Description Panel

To Isolate CT circuit Measured Current Wire no.

Device: Pin Checked Box Before Isolate After Isolated

DWG. NO. HTGU-275-PSI-36329-S-6004 SH: 16

To Measure and Isolate Terminal Block CT circuit

DH+RT1

E13 XE 1 A A

E33 XE 2 A A

E53 XE 3 A A

XE 4 A A

Dwg. No & Sh


To Isolate VT circuit Measured Voltage Wire no.


DWG. NO. HTGU-275-PSI-36329-S-6004 SH: 16

To Measure and Isolate Terminal Block VT circuit

DH+RT1

C71 XC 1 V V

C31 XC 2 V V



METHOD STATEMENT


CONTRACT NO.: TNB 320/2013 SUBSTATION: PMU 275/33kV HULU TERENGGANU Issues 2: Alarm_Presist10 at Breaker Failure Relay (NARI RCS 921) for Bus Coupler bay D04+R occurred due to Neutral Current is higher than other phase

Dwg. No & Sh


To Isolate CT circuit Measured Current Wire no.



To Measure and Isolate Terminal Block CT circuit (Core 1) (Main Protection 1)

D04+R

C111 -XC1 1 A A

C131 -XC1 2 A A

C151 -XC1 3 A A

C170 -XC1 4 A A



METHOD STATEMENT





METHOD STATEMENT


CONTRACT NO.: TNB 320/2013 SUBSTATION: PMU 275/33kV HULU TERENGGANU D5) WORK PROGRAM OVERALL WORK FLOW CHART

Start

To obtained PTW from TNB

Investigation on issues raise Confirmed all relay replacement circuit isolated from DC supply

PSI will do the isolation base on Isolation list of this Method Statement

Final Wiring check at new added circuits before handover to tester

After complete all the work inform TNB to witness and handover to the

tester for testing

Dismantle existing relay and install new relay as per approved drawing

END



METHOD STATEMENT


CONTRACT NO.: TNB 320/2013 SUBSTATION: PMU 275/33kV HULU TERENGGANU APPENDIX E CONTIGENCY PLAN Immediate action will be taken if any unwanted situation happens as below: 1) Action taken if any accident happen during do wiring etc.

Stop all work and report to TNB supervisor and TNB AP. Make sure the victim still conscious. Victim unconscious immediately send to hospital. PSI supervisor above will report to S.E and TNB PIC. Ask TNB AP for next cause of action Situations become worse stop all work.

2) Action taken when non tripping fault or hazard occurs during does any electrical work. (Non-tripping fault is

when fault happened, breaker will not trip. Only alarm will send to annunciator. Example: AC Supply Fail) Stop all work and report to TNB supervisor and TNB AP. Tester will Investigated location of fault happen. Asked all workers who at fault location. Discuss the outcome with the S.E and TNB PIC. Any conclusion TNB PIC and S.E will decide. Ask TNB AP for next cause of action

3) Action taken if any unknown tripping during electrical work.

Stop all work inside control room and inform ESE and TNB AP immediately Record tripping information from annunciation, prot relay, tx guard, bay no. etc Immediately study what caused tripping. Inform all the detail to the S.E and TNB PIC. Any conclusion depends on S.E and TNB PIC.

4) Action taken if any DC earth fault occurred during electrical work.

Stop all work inside control room. Asked all workers if any unusual things happen during do the work. Asked workers what wire they touch or cut. Investigated with the tester and clear the DC earth fault immediately. Inform to the S.E and TNB.



CD ELECTRICAL ENGINEERING SDN. BHD – TRANNSGRID VENTURES SDN. BHD. JOINT VENTURES

COMPETANT CERTIFICATES

mos investigate avr & cbf relay

Documents

faulty relay

avr relay faulty alarm

breaker failure relay

kv hulu terengganu appendix

siemens microtapp avr

breaker failure relay

kv hulu terengganu bay

kv hulu terengganu objectives