Different Types of Fuses used in Siemens PI/RRI Circuits · 600 V DC Siemens Diazed Fuses 750 V AC...

Fuse is a primary protection component of each electronic/electric equipment orsystem. Since working of S&T equipment effects Railway movement therefore it isessential that fuses of specified rates must be used. Fuses of various types and variousratings are being used in Signal & Telecommunication department.

Fuse is a safety device and the weakest part of the electrical system. It consists of asmall link of soft metal, which melts when excessive current passes through it. Thefuse wires are usually bare wires and made of lead and tin. Lead alloy for small currentand tinned copper wire issued for large current. Upto 3 amperes load, lead fuse wiresare used, upto 15 amperes alloy of lead and tin is used and above 15 amperes, tinnedcopper wires are used.

If a short circuit occurs anywhere in the wiring system, an excessive current flows through the wires andfuse and if fuse operates properly, it will melt, cutting of the current before any harm can be done. If the fusefails to operate, the wire may become hot enough to ignite the insulation, possibly causing a fire and it mayharm the appliances and fittings connected in the circuit.

Fuses have a second function. Besides protecting in the case of short circuit, they protect in the case ofoverload. If too many appliances are connected to one circuit, more current will flow through the supply wiresthan the wires were meant to carry and will cause the wires to be burnt and appliances, accessories connectedto the circuits will also be damaged. In such cases, the fuse, if properly selected, will melt or blow, thusprotecting the wires, appliances, accessories etc.

IEC 60269 unifies the electrical characteristics of fuses that are dimensionally interchangeable with fusesbuilt to earlier British, German, French or Italian standards. The standard identifies application categorieswhich classify the time-current characteristic of each type of fuse. The application cateogory is a two-digitcode.

The first letter is a if the fuse is for short-circuit protection only; an associated device must provideoverload protection.The first letter is g if the fuse is intended to operate even with currents as low as those that cause it toblow in one hour. These are considered general-purpose fuses for protection of wires.The second letter indicates the type of equipment or system to be protected:

D – North American time-delay fuses for motor circuits, UL 248 fusesG – General purpose protection of wires and cablesM – MotorsN – Conductors sized to North American practice, UL 248 fusesPV – Solar photovoltaic arrays as per 60269-6R, S – Rectifiers or semiconductors as per 60269-5Tr – Transformers

Any fuses built to the IEC 60269 standard and carrying the same application category (for example, gGor aM) will have similar electrical characteristics, time-current characteristics, and power dissipationas any other, even if the fuses are made in the packages standardized to the earlier national standards.Fuses of the same application category can be substituted for each other provided the voltage rating ofthe circuit does not exceed the fuse rating.

Siemens Diazed Bottle FusesSiemens DIAZED fuse system is one of the oldest fuse systems in the world. It was developed by Siemens

as far back as 1906. It is still the standard fuse system in many countries to this day. It is particularly widely

Different Types of Fuses used inSiemens PI/RRI Circuits

Shri M Koteswara Rao, Sr.DSTE/Sc Division/SCR

Gyandeep - Anniversary Issue ‘16

used in the harsh environments of industrial applications. Diazed Fuses, commonly called Bottle Fuses, areavailable in four sizes, NDz to 25 Amps, DII to 25 Amps, DIII to 63 Amps and DIV to 100 Amps with ratedvoltages from 500 to 750 V. Diazed fuses are available with quick blow characteristic (5SA1, 5SB1, 5SB3,5SC1), slow blow (5SA2) or standard gG line protection (5SB2, 5SB4, 5SC2).

Siemens DIAZED Bases (5SF1, 5SF4, 5SF5, 5SF6) must be fed from the bottom to ensure an insulatedthreaded ring when the fuse link is being removed. Reliable contact of the fuse links is only ensured when usedtogether with DIAZED screw adapters (5SH3). Fuse accessories are sized to match these five sizes. Each sizefuse body has a different diameter to fit only into the appropriate Screw Cap and Fuse Base (5SH1).

DIAZED stands for "DIAmetralgestuftes Zweiteiliges Sicherungssystemmit EDisongewinde" (Diametral

two-step Fuse System with Edison screw).

The larger end cap (the "bottom" of the bottle) has at its centre a small spring-loaded button retained by athin wire, which serves as a "fuse blown" indicator. When the fuse blows, the wire breaks and the indicatorbutton is ejected by the spring. A missing or displaced indicator thus pinpoints a blown fuse. The removablepart of the fuse holder has a small window to allow inspection of the indicator without removal of the fuse.

Siemens Diazed Bottle Fuses gG

Siemens Diazed Fuses Slow Blow

Siemens Diazed Fuses Quick Response

Siemens Diazed Fuses 690 V AC &

600 V DC

Siemens Diazed Fuses 750 V AC &

750 V DC

Siemens Diazed Fuse Bases

Siemens Diazed Fuse Screw Caps

CLEARANCE Siemens D-TYPE

CLEARANCE Siemens D-TYPE

Siemens Fuse Holder Clearance G type fuse

Sl.No. Fuse Capacity Fuse Blown Indication

1. 0.63 A Green

2. 1.6 A Red

3. 6 A Green

4. 3 A Yellow


Never use a "D" fuse for a general purpose circuit.

Indian railways uses the following fuses in various types of Siemens circuits :

Sl.No. Details of Fuses

1 D' Type ( bottle) type HRC fuse link rating 2A (500V-50A AC & 250V-4KA DC) delayed action conform to IS 8187

2 D' Type ( bottle) type HRC fuse link rating 4 A

3 "D" TYPE 6 AMPS.HRC FUSE LINK SUITABLE FOR 100VDC,QUICK ACTION,CONFORMING TO IS-8187(1976) AND TO CLW SPCN CLW/ES/F-8/D,BHARAT LINDER CAT NO 597-006 OR EQVALENT.[VITAL ITEM]ACCEPTED : VIRAL MAKE







10 DIN TYPE FUSE LINK 63 A 500 Volts, Breaking Capacity 120 KA, Size Dimension Comply with IEC-269 & Confirm to IS 13703 Make- L&T, SIEMENS, INDO ASIAN

11DIN type HRC Fuse LINK,80 AMPS,500 Volts Breaking Capctiy:80 KA,SIZE 1,Dimension comply with DIN 43620/IEC-269 and suit the Fuse fitting 1W1 and confirming to IS-13703/IEC-269.make L&T, Siemens, Indo Asian

12DIN type HRC Fuse LINK, 100 AMPS, 500 Volts Breaking Capctiy:80 KA,SIZE 1, Dimension comply, with DIN 43620/IEC-269 and suit the Fuse fitting 1W1 and confirming to IS-13703/IEC-269. make L&T, Siemens, Indo Asian

13DIN type HRC Fuse LINK,315 AMPS,500 Volts Breaking Capctiy:80 KA,SIZE 1, Dimension comply with DIN 43620/IEC-269 and suit the Fuse fitting 1W1 and confirming to IS-13703/IEC-269.make L&T, Siemens, Indo Asian

14 6 AMPS BOTTLE TYPE FUSE OF BHARAT LINDER MAKE

15 1.6 A mp capacity Indicating ‘G’ Type Low Voltage Non-Deteriorating Type Fuse Link for Rly. Signalling Installation Specn. No. IRS.S-80/92 or Latest

16 G' type fuse with holder 0.6 A low voltage non deteriorating type as per IRS-S-80/92 or latest. Accepted make Rapid / Maland or System only

176AMP CAPACITY INDICATING ''G'' TYPELOW VOLTAGE NON-DETERIORATING TYPE FUSE LINK FOR RLY.SIGNALLINGINSTALLATION SPECN.NO.IRS-S-80/92 ORLATEST

186AMP CAPACITY INDICATING ''G'' TYPELOW VOLTAGE NON-DETERIORATING TYPE FUSE LINK FOR RLY. SIGNALLINGINSTALLATION SPECN.NO.IRS-S-80/92 ORLATEST

19 G' type fuse with holder 0.4 A low voltage non deteriorating type as per IRS-S-80/92 or latest. Accepted make Rapid / Maland or System only

20"D" TYPE 6 AMPS. HRC FUSE LINK SUITABLE FOR 100VDC,QUICK ACTION, CONFORMING TO IS-8187(1976) AND TO CLW SPCN CLW/ES/F-8/D,BHARAT LINDER CAT NO 597-006 OR EQVALENT. [VITAL ITEM] ACCEPTED : VIRAL MAKE

21D TYPE 35 AMPS HRC FUSE LINK SUITABLE FOR 100 VDC DELAYED ACTION TYPE CONFORMING TO IS 8187(1976) AND TO CLW SPCN.CLW/ES/F-8/D. [VITAL ITEM] ACCEPTED DESCRIPTION: COOPER BUSSMANN MAKEPART NO.35K07-660.

Sl.No. Capacity Description

1 2 Amps Indications over LT power panel

2 6 Amps Point operations Circuit

3 10 Amps Power Supply for Alstom AFTC per Rack

4 63,100,125 Amps Primary side protection from various Feeders of 440V Side

5 35 Amps Secondary side load for Panel Interlocking

6 50 Amps, 80 Amps Secondary side load


D type Fuses are used in the following Siemens circuits :

G type Fuses are used in the following Siemens circuits :Recently we started using PPTC fuses also in the Siemens circuits.

Sl.No. Capacity Description

1 0.6 Amps Signal Lamp and Indication Circuits

2 1.6 Amps 24V/60V circuits

3 3 Amps ABB AFTC

4 6.3 Amps Power Supply for Siemens AFTC per Rack

5 3.15 Amps Power Supply for Siemens MSDAC per Rack

Sl. No. Location Outer Circuits Capacity

of fuse PPTC fuse

1

Apparatus case

i) Feed end of Track circuit 2 amp Required

2 ii) TPR fuse 2 amp Required

3 iii) ED fuse (If provided) (ED of mechanical signal) 2 amp Required

4 iv) NWKPR/RWKPR fuse (ED of mechanical signal) 2 amp Required

7 v) Track feed charger 110V AC input fuse 2 amp Required

8 vi) EJB fuse for analog axle counter 2 amp Required

9 vii) NKPR/RKPR fuse 2 amp Required

10 viii) Boom motor operation fuse (24V/110V) 6 amp Required

11 ix) XCKPR fuse 2 amp Required

12 x) Location lamp fuse 2 amp Required

13 xi) Signal motor operation fuse (For mechanical signalling) 4 amp Required

14 Relay room (CT rack)

i) 110V AC N/S supply for track feed charger 6 amp Required

15 ii) 24V DC N/S supply for TPR 4 amp Required

16 iii) 110V AC for LC gate locatedwithin 2 KM 6 amp Required

19

Power equipment (Main fuse board)

i) 24V for CEL BPAC 2 amp Required

20 ii) 24V for Eldyne BPAC 2 amp Required

21 iii) 24V DC External N/S for TPR 4 amp Required

22 iv) 110V AC N/S for track feed charger 6 amp Required

25 v) 24V External N/S for EJB of analog AXT 4 amp Required

26 vi) 60V/24V External for KLCR 2 amp Required

27 VII) Panel indication fuse 4 amp Required

Note:- Fuse capacity may depend on load current and it must be at least 2 times of load current


Provision of PPTC fuses for outdoor circuits :Fixing arrangement of PPTC fuses :

PPTC fuses are to be connected with crimped ring type lugs. With these lugs, PPTC fuses fit nicely on ARA(American Rail Associates) terminals. This will provide a high reliability grip to the fuses in addition to the

crimping. The crimped area is also to be filled with solder for enhancing reliability.

Siemens circuits use either common fuse or independent fuses depending upon the type and nature ofcircuits. A bifurcation of common and independent fuse circuits are given below.

Sl.

No Circuit Name

1 GNPR, UNPR, GNCR, UNCR, CHYNCR, WNR, WNCR

2 STATION GSBR/GSBPR, CHNBR/CHRBR (EZ, CZ, WZCHYNCR)

3 DIVERSION RELAY CIRCUIT Z1UR1

4 DIVERSION RELAY CIRCUIT ZU(R)R/ZU(N)R

7


Common Fuses:Separate Fuses :

1. Universal route groups2. Signal groups3. Point groups4. Shunt signal groups5. Every gate circuit6. Cutting in relay7. AJTR

Note: G(R )LR and signal groups will have common fuse. In case of common G(R )LR power supply is

5 SHUNT G(R/N)R CIRCUIT, SHUNT U(R/N)R CIRCUIT

6 Z1UR, ZDUCR, MNGZR, SH GZR, ROUTE INITIATION GZR CIRCUIT

7 ZDUCPR, GZPR AND EUUYNCPR RELAY CIRCUIT

8 STN EUYNR, STN EUUYNR AND EUYR CIRCUITS (ALL ZONES)

9 MNGNPR, SHGNPR COMMON RELAYS

10 ATR RELAY CIRCUIT

11 OVERLAP SETTING CIRCUIT OV2, U(R)R

12 OYNR RELAY CIRCUIT

13 OVERLAP RELEASE CIRCUIT Z2U(N)R

14 OVERLAP REPEATER RELAY CIRCUITS

15 OVELAP TIMER RELAYS

16 OVERLAP TIMER INDICATION CIRCUITS

17 ROUTE GROUP INDICATOR CIRCUITS

18 POINT CHAIN GROUP CIRCUITS

19 NKR, RKR COIL CIRCUIT

20 POINT OPERATION RELAYS EWNR/WWNR, EMERGENCY POINT OPERATION CKTS

21 RRI POINT UNLOCKING CIRCUITS

22 CRANK HANDLE RELAY (CH)

23 YCPR REPEATOR RELAYS

24 MAIN SIGNAL GLSR, GR1, GR2

25 MAIN SIGNAL GR3, GR4

26 G(N)LR CIRCUITS

27 ROUTE INDICATOR UR RELAY CIRCUITS

28 SHUNT SIGNAL GLSR

29 INDICATION OF CALLING ON SIGNAL

30 CALLING ON LAMP CIRCUIT

31 CALLING ON PANEL INDICATION CIRCUIT

32 CUTTING RELAYS FOR SIGNALS

33 TRACK REPEATOR RELAYS (RE)

34 ALARM CIRCUIT

35 DISTANT SIGNAL CIRCUIT

35 BPAC CIRCUIT

The Genesis of e-tendering owes its roots to Information Technology ACT: 2000.Subsequent to promulgation of IT Act-2000, which gave legal recognition to electronictransactions, Indian Railways initiated small but definite strides towards e-governancein public procurement process. The conventional system of selling hard copies oftender booklets (of works tenders) to prospective bidders was done away with anduploading of the tender documents in the zonal railway’s official website(www.scr.indianrailways.gov.in) was started in 2004 in compliance of Railway Board’sInstructions. Subsequent to promulgation of Information Technology Amendment Act-2008 (ITAA-2008), E-Procurement of Stores tenders in its current format was introducedin Indian Railways in the year 2012. After successful implementation of E-Procurementof stores, several attempts were made to introduce similar model for works tenders also

but with limited success due to various reasons.

In 2014-15, the Central Government gave a hard push to digitisation and e-governance and finally Centrefor Railway Information System [CRIS] was entrusted with the task of developing an e-tendering module forworks tenders duly dovetailing it into Indian Railway Electronic Procurement System [IREPS]. CRIS anautonomous organization of the Ministry of Railways is the IT wing of the Indian Railways was established in1986 by Ministry of Railways, Government of India for design, development and implementation of ComputerSystems on India Railways. CRIS is successful in the development, implementation, operation, and maintenanceof a number of major IT applications of the Indian Railways, including the well-known Passenger ReservationSystem (PRS), Next Generation E-Ticketing System (NGeT), Unreserved Ticketing System (UTS), FreightOperations Information System (FOIS), e-Procurement System (EPS), Track Management System (TMS), CrewManagement System (CMS), Control Office Application (COA), Accounting Information Management System,etc.

Through series of letters, Railway Board from September’2015 onwards advised all Zonal Railways andPSUs to gear up preparations for implementation of E-Tendering in works contract. Meetings at Board withSAG level officers of various zonal railways and PSUs was organised and hands on training session / workshopsfor system administrators was given at New Delhi. Further, CRIS teams have conducted training sessions atvarious zonal railway headquarters and imparted training to various department users. Hon’ble Minister forRailways Sri Suresh Prabhakar Prabhu had on 1st February, 2016 formally launched IREPS portal therebyushering in the Phase-I of E-Tendering in works contracts. In Phase-I, the tendering process right from creatingof Notice issuing Tender publishing of briefing note was programmed through IREPS. Phase-II module, furtherextending the tendering process upto signing of contract agreements on line is under development by CRIS andis expected to be launched in a few month’s time. Railway Board, vide the letter dated 05.02.2016 advised allZonal Railways/PSUs to switch over to E-Tendering of works contracts with effect from 01.04.16 onwards andany deviation should be only with the approval of CAO/C in construction, DRMs in the divisions and GM atHead quarters. Zonal railways were instructed to send quarterly exception report to RB. For the information ofbidders, wide publicity was given in news papers as well as through the official website of SCR, advising aboutthe switching over to E-Tendering.

IREPS [https://www.ireps.gov.in] is the official portal of Indian Railways for procurement of Goods, Works& Services, Sale of Materials, and Leasing of Assets through the process of E-Tendering, E-Auction or ReverseAuction. The site is developed and maintained by CRIS using the latest technology and security features.Salient security features deployed include asymmetric cryptography, PKI enablement, digital signature, 256 bit'VeriSign' Extended SSL, apart from standard security features like user name, password, digital authentication,role based access and privileges, audit trail, time synchronization for all Production servers with IST (acquiredfrom NPL) etc. The data centre has been designed to be fully secure using various hardware and software

E-TENDERING OF WORKS TENDERS

Shri AVH Mallikarjuna, DyCE/Con/Genl-I/SC

Different Types of Fuses used in Siemens PI/RRI Circuits · 600 V DC Siemens Diazed Fuses 750 V AC...

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