CTR FIRE SYSTEMS DIVISION POONA DETAILS OF DRAWINGS FOR APPROVAL OF FIRE PREVENTION AND EXTINGUISHING SYSTEM BY NITROGEN INJECTION METHOD FOR 2 x 315MVA, 400/138/34.5 kV AUTO TRANSFORMER FOR CROMPTON GREAVES LIMITED, MUMBAI A/C TATA STEEL LTD.JAMSHEDPUR (W.O.NO. T09849) (CONSULTANT: TATA CONSULTING ENGINEERS LIMITED) SR. NR.
DRAWING NUMBER
1
FS 3743 A3 01
DETAILS OF INTERCONNECTION DIAGRAM OF PNT FIRE SYSTEM 220 VDC FOR CGL A/C TATA STEEL LIMITED
2
FS 1940 A4 01
DETAILS OF CONTROL BOX OF PNT FIRE SYSTEM 220 VDC
3
FS 1935 A4 01
DETAILS OF FIRE EXTINGUISHING CUBICLE OF PNTMXXXC20 FIRE SYSTEM
4
FS 1936 A4 01
DETAILS OF CUBICLE OF PNTMXXXC20 FIRE SYSTEM
5
FS 1957 A4 00
DETAILS OF VALVE POSITION WITH PRESSURE SWITCH IN F.E.C. OF PNT FIRE SYSTEM
6
FS 1960 A4 04
DETAILS OF PNRV (TCIV)AND MOUNTING FLANGES FOR PNRV (TCIV)OF PNT FIRE SYSTEM
7
FS 1961 A4 00
DETAILS OF WORKING OF PRE-STRESSED NON RETURN VALVE OF PNT FIRE SYSTEM
8
FS 1939 A4 02
DETAILS OF `T’ TYPE FIRE DETECTOR OF PNT P NT FIRE SYSTEM
9
FS 1934 A4 01
DETAILS OF PLINTH FOR FIRE EXTINGUISHING CUBICLE OF PNTMXXXC20 FIRE SYSTEM
10
FS 1966 A3 02
DETAILS OF LOGIC DIAGRAM FOR OPERATION OF PNT FIRE SYSTEM
11
FS 1946 A3 02
DETAILS OF OIL PIT FOR PNT FIRE SYSTEM
12
FS 2527 A4 01
DETAILS OF SCHEMATIC CONTROL DIAGRAM OF PNT FIRE SYSTEM FOR PNT FIRE SYSTEM FOR 220 VDC
13
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GUARANTEED TECHNICAL PARTICULARS
14
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FUNCTIONAL DISCRIPTION
15
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BILL OF MATERIAL FOR SYSTEM
TITLE
16
DETAILS OF WIRING DIAGRAM FOR CONTROL FS 3791 A3 00 BOX OF PNT FIRE SYSTEM 220 VDC FOR CGL A/C TATA
17
FS 3792 A4 00
REMARKS
DETAILS OF ELECTRICAL WIRING CONNECTION, 220 VDC FOR CGL A/C TATA TURNOVER
FOR REFERENCE 1
:
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SEQUENTIAL OPERATION OF PNT FIRE SYSTEM
PREPARED CHECKED APPROVED Y:OFA (FS4) BY:SAPM(FS) BY:VP3 Initials
DMJ:dmj
DMJ
VKW
Date
31.01.2011
31.01.2011
31.01.2011
CC:MKM(FS) —- 1 SET + 1 SOFT COPY FOR CUSTOMER :DEA(FS3) --- 1 SET
FOR REFERENCE 1
:
---
SEQUENTIAL OPERATION OF PNT FIRE SYSTEM
PREPARED CHECKED APPROVED Y:OFA (FS4) BY:SAPM(FS) BY:VP3 Initials
DMJ:dmj
DMJ
VKW
Date
31.01.2011
31.01.2011
31.01.2011
CC:MKM(FS) —- 1 SET + 1 SOFT COPY FOR CUSTOMER :DEA(FS3) --- 1 SET
GUARANTEED TECHNICAL PARTICULARS
FOR NITROGEN INJECTION FIRE PREVENTION AND EXTINGUISHING SYSTEM FOR 2 X 315 MVA,400/138/34.5 kV AURO TRANSFORMER FOR CROMPTON GREAVES LIMITED, MUMBAI A/C TATA STEEL LTD, JAMSHEDPUR (W.O.NO. T09849) Sr. No.
Description
Guaranteed Particulars
1
Name of Manufacture and country of CTR Manufacturing Industries Ltd. Pune origin transformer INDIA
2
Reference standards
Manufacturer's relevant IS, BS
3
Details of system equipments
FEC, CB, TCIV,DETECTORS
4
FEC(Fire Extinguishing Cubicle)
4.1
Dimensions (LXBXH) mm
1600X600X1800+100(Base)
4.2
Weight
550 kg Maximum
4.3
Capacity of Nitrogen cylinder
2X10 Cubic Meter 150 kg/ sq.cm. Pressure
4.4
Number of cylinders
2
4.5
Pressure of Nitrogen filing
150kg/cm2 Maximum
4.6 Minimum distance of FE cubicle from 5 meters or place next to fire wall if fire the transformer fighting wall exists. 4.7
Method of mounting
Floor
4.8 Whether the following items are provided in FE cubicle. If so furnish make, type & other details. 4.9
Contact manometer
GIC/FIEGBIG/ GAUGES BOURDEN,Falling pressure, Electrical contact
4.10 Pressure Regulator
VANAZ/PAARTH/MESSER/EQUIVALENT
4.11 Oil Release Unit
CTR
4.12 Gas release unit
CTR
4.13 Oil drain assembly
CTR
4.14 Pressure /limit switches
Pressure switch (Back up) : ORION/ INDFOS/ EQUIVALENT Limit switch: TECKNIC/ SCHMERSAL/ EQUIVALENT
4.15 No of contacts & spare contacts (NO&NC)
Limit switches G02=2 NO, G03= 2NO, G04=1NO+1NC, G05=2NO/ 1NC+1NO, G06=2NO/1NC+1NO
4.16 Oil drain valve (ABOVE FEC) 4.17 Make
PETSON/SUNRISE/EQUIVALENT
4.18 Type
Butterfly valve
4.19 Size
125NB
4.20 Type of metal
Mild steel
4.21 Nitrogen Injection Valve FEC)
(ABOVE
4.22 Make
OSWAL/LEADER/MANIXON/NEO/EQUIVALENT
4.23 Type
Gun metal, Lockable, Stem rising
4.24 Size
25NB
4.25 Oil drain pipe
Yes ..2.. ..2..
4.26 Size
125NB
4.27 Length
As per site location, Transformer to FEC & FEC to Oil Pit.
4.28 Number of openings in the transformer tank
1
4.29 Material
MS,ERW, Heavy duty for TRS to FEC & GI, Medium for FEC to Oil pit.
5
Control Box
5.1
Dimensions
(LXBXH) mm
500x270x700
5.2
Weight
45 Kg Maximum
5.3
Type & Thickness of sheet steel
CRCA, 16/14 SWG
5.4 Details of components provided in the control box
MCB, Relays, Hooters, Contactors, Indicating lamps, Operating switches, Latch contactactos, Rotary switches.
5.5
Control voltage
220 VDC
5.6
Method of mounting
Wall
5.7 Whether audio and visual alarms provided? 6
Yes with different volume (dB) levels
Transformer Conservator Isolation Valve (TCIV)
6.1
Make
CTR
6.2
Type
Operating mechanically of Transformer oil flow rate with visual position indicator.
6.3
Location
In the conservator pipe line between Conservator and Buchholz relay.
6.4 Whether suitable for pipe of size 80mm dia
Yes
6.5 No of contacts & spare contacts (NO&NC) 6.6 Padlocking provision
1NO
7
YES
Fire Detectors
7.1
Make
CTR
7.2
Type
Quartz bulb, Heat sensing.
7.3
Quantity required
Depending upon transformner top cover area.
7.4
Method of fixing
Bolting on bracket on transformer top cover.
7.5
Effective heat sensing area
Circular 2.01 sq. meter (800mm Radius)
7.6 Temperature recommended for effective heat sensing
141°C
7.7
Number of contacts NO/NC
2 NO
7.8
Necessity and Condition of Refilling
After operation
8
Whether approved by Tariff Advisory Yes Committee of India ..3.. ..3..
9 10
TECHNICAL PARTICUARS FOR NITROGEN INJECTION SYSTEM FOR PREVENTION OF TRANSFORMER EXPLOSION Power Supply
10.1 Control box
220 VDC and 230VAC for DC fail alarm
10.2 FEC (lighting)
230VAC
10.3 Extinction period
Maximum 3 minutes
10.4 On system activation
Maximum 3 minutes
10.5 Oncommencement of Nitrogen injection
Maximum 30 Seconds
11
FEC suitable for capacity
Transformer : 315 MVA
11.1 Dimensions (LXBXH) mm
1600X600X1800+100(Base)
11.2 Weight
550 kg Maximum
11.3 Nitrogen cylinder capacity
2X10 Cubic Meter 150 kg/ sq.cm. Pressure, 68 Litre water capacity
12
Control Box
12.1 Dimensions (LXBXH) mm
500x270x700
12.2 Weight
45 kg Maximum
13
Fire Detectors
13.1 Heat sensing temperature
141°C
13.2 Time of operation Transformer Tank Explosion Prevention
Fire Extinction
a. For system activation
Maximum 50 Milliseconds
Maximum 100 Milliseconds
b. For reduction of pressure in Tank by Nitrogen release
Maximum 730 Milliseconds
Maximum 730 Milliseconds
13.3 Any other technical details not covered above
DMJ:smp 16.11.2010
On line supervision of required signals, DC supply monitoring, Test facility (excluding PNRV(TCIV), FD) on live transformer, Anticondensation heater for FEC.
CTR FIRE SYSTEMS DIVISION POONA
1/2
FUNCTIONAL DESCRIPTION OF NITROGEN INJECTION FIRE PROTECTION SYSTEM FOR OIL FILLED TRANSFORMER
GENERAL :
Nitrogen Injection Fire Prevention and extinguishing System designed for oil filled transformers, shall prevent tank explosion and the fire during internal faults resulting in an arc where tank explosion will normally take few seconds after arc generation and also extinguish the external oil fires on transformer top cover due to tank explosion and/or external failures like bushing fires, due to OLTC fires and fire from surrounding equipments. The system shall work on the principle of DRAIN AND STIR and on activation, shall drain a pre-determined quantity of oil from the tank top through outlet valve, to reduce the tank pressure and inject nitrogen gas at high pressure from the lower side of the tank through inlet valves to create stirring action and reduce the temperature of top oil surface below flash point to extinguish the fire. Conservator tank oil shall be isolated during tank explosion and oil fire, to prevent aggravation of oil fire. Transformer isolation activating the system
shall
be
an
essential
pre-condition
for
The system shall be designed to operate manually, in case of failure of power source. OPERATIONAL CONTROLS
The system is provided with automatic control for fire Prevention and fire extinction besides remote electrical switch control on control box and local manual control in the fire extinguishing cubicle. Transformer isolation through Master trip relay, or circuit breaker (HV and LV in series) shall be an essential requirement for the system activation in automatic or remote electrical control. (Drawing Nr. FS 1966 A3 01) A. Automatic control: A.1
Operation under prevention mode : Due to internal arcing gases are generated, resulting into pressurizing the transformer tank. These leads to operation of differential relay, pressure relief valve and / or buchholz relay. On sensing these faults, which is the first stage of transformer being under fire, a predetermined quantity of oil from tank top is drained, which reduces the pressure in tank. Simultaneously conservator oil is isolated through Pre-stressed non return valve and nitrogen gas starts injecting at predetermined flow and pressure from lower side of the transformer tank to reduce temperature of top oil surface.
2/2 A.2
Operation under extinction mode: During transformer fire, Pre-stressed non return valve operates and isolates the conservator oil to prevent further aggravation and spreading of fire. Before rupture of tank, Pressure relief valve and / or buchholz relay operates due to pressurization of transformer tank. Due to fire on transformer, Fire detector will operate. After receipt of these signals predetermined quantity of oil will be drained. Simultaneously nitrogen gas starts injecting at predetermined flow and pressure from lower side of the transformer tank to reduce temperature of top oil below flash point and extinguishes the fire.
B.
Remote manual In case system failed to operate in Auto mode due to non availability any one signal, operator shall operate system manually by breaking window glass and operating extinction release switch.
C.
Local Manual In case system failed to operate in Auto mode / remote manual mode due to non availability of either signal or failure of power source, operator shall operate system manually from fire extinguishing cubicle and extinguishes the fire.
VKE:dmj 20.04.2003
CTR FIRE SYSTEMS DIVISION LOCATION:POONA
BOM FOR NITROGEN INJECTION FIRE PROTECTION SYSTEM
SR. NO.
ITEM DESCRIPTION
QTY PER SYSTEM
REMARKS
1
FIRE EXTINGUISHING CUBICLE
1 NO
2
CONTROL BOX
1 NO
3
1 NO
4
TRANSFORMER CONSERVATOR ISOLATION VALVE (TCIV) FIRE DETECTORS
5
FIRE SURVIVAL CABLE
6
FIRE RETARDANT LOW SMOKE (FRLS), 12CORE X 1.5 1200 MTR APPROXIMATE LENGTH * SQ.MM, ARMOURED, COPPER FIRE RETARDANT LOW SMOKE (FRLS), 4CORE X 1.5 200 MTR SQ.MM, ARMOURED, COPPER PIPES AND CONNECTION FITTINGS (TRANSFORMER1 SET FEC-OIL PIT) PLINTH FOR FIRE EXTINGUISHING CUBICLE 1 NO NOT IN CTR SCOPE OF SUPPLY
7 8 9 10
OIL PIT
11
SPARES FOR EACH SUBSTATION
15 NOS 60 MTRS
1 NO
11.1 FILLED NITROGEN CYLINDER (68 LITRE WATER CAPACITY) 11.2 HOSE PIPES WITH FITTINGS
NOT IN CTR SCOPE OF SUPPLY
2 Nos. 1 set
11.3 HEAT SENSOR ASSEMBLY
3 Nos
11.4 PRESSURE REGULATOR ASSEMBLY
1 set
* Cable length through trench between 1. FEC near transformer and Control room 2. CGL Marshalling box near transformer and control room 3. Control room and control room. May be calculated on receipt on cable trench layout in autocad 2004/2005 format. CUSTOMER
CROMPTON GREEVES LIMITED MUMBAI (W.O. NR. 9849)
CONSULTANT
TATA CONSULTING ENGINEERS LIMTTED, MUMBAI
END USER
TATA STEEL LIMITED, JAMSHEDPUR
RATING
2 X 315 MVA, 400/138/34.5 kV AUTO TRANSFORMER
Initials Date
Prepared by : DEA(FS3) DMJ:dmj
Checked by : SAPM(FS) DMJ
05.01.2011
05.01.2011
Approved by : VP3 VKW 05.01.2011
CTR FIRE SYSTEMS DIVISION LOCATION:POONA SEQUENTIAL OPERATIONS OF OIL DRAIN AND NITROGEN INJECTION FIRE PROTECTION SYSTEM FOR OIL FILLED TRANSFORMERS. On receipt of required operating inputs signals, 220 VDC/110VDC supply is extended through terminal Nr 22 (+ve) and terminal Nr 23(-ve) (Terminal trip (TS1) of control box to Terminal Nr 3 and Terminal Nr 4 (TS3) of Fire Extinguishing cubicle respectively.
•
Operation and monitoring of oil release unit and gas release unit. Y01 Lifting Magnet Y01 is energized for initiation of oil release unit i.e. depressurization of transformer tank
G02 Limit Switch Resets Y01 Lifting magnet (Indicates oil drain valve closed position, prior to initiation of oil release unit) NC OPEN CONTACT CONTACT
G03 Limit Switch Indicates oil drain valve open, energizing Lifting magnet Y02 NO CLOSE CONTACT CONTACT
PO4 Pressure switch Back-up for energizing Lifting magnet Y02
NO CONTACT
CLOSE CONTACT
Y02 Lifting Magnet Y02 is energized for initiation of Nitrogen gas release unit i.e. starting of nitrogen injection
G04 Limit Switch Indicates extinction in progress (NO CLOSE) and resets gas inlet valve closed indication NC OPEN CONTACT CONTACT
..2..
