Jumper is a conductor which are used for connectivity between two conductors or equipments. The jumper should be flexible so that the required shape can be given to them easily to suit the requirement of the location.
Many types of jumpers are used in 25 kv & 2×25 kv OHE, Which are as follows-
- G- Jumper
- F – Jumper
- Anti theft jumper (ATJ)
- C-jumper
- F-jumper
- Feeder jumper
- Aluminium Large jumper
To put a jumper in OHE, We need some PG (Parallel grooves). PG depends on the size of conductors(catenary, contact, LSW, ACW, Jumper ).
Now, We will read in details about the jumper used in OHE (2x25kv & 25kv) and the PG attached with them.
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Continuity jumper/G-Jumper
G-jumper is used in UIOL, turnout , diamond crossings and cross over for providing a parallel path for the current from one OHE shot to another OHE shot. This is a Flexible type copper stranded conductors.
Its length & diameter depends upon the diameter of the catenary and contact wires of OHE.
You can read about the size of G- jumper and the PG to be fitted with them in table no-1(2X25kv OHE) and table no-2(25kv OHE).
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F – Jumper
F jumper of approximately 50 mm square cross section is provided at insulated overlap to keep the current path between the cut in insulators and the nearest anchorage due to which spark is not generated in the cutting portion of the Catenary & Contact wires.
You can read about the size of F- jumper and the PG to be fitted with them in table no-1(2X25kv OHE) and table no-2(25kv OHE).
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Anti-theft jumper (ATJ)
Anti-theft jumper is used in out of run wire to prevent theft. It is made by cadmium copper material. The diameter of ATJ is 50 square mm. it have 3 wires in a set (1.4 meters, 1.8 meters, 2.30 meters ).
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C-jumper
C jumper is used to connect the Catenary wire and contact wire at every 350 m for providing a parallel path for the current between the them, so that the load current is proportionately shared by Catenary & contact wire.
You can read about the size of C- jumper and the PG to be fitted with them in table no-1(2X25kv OHE) and table no-2(25kv OHE).
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Feeder Jumper
Feeder jumper is used for connection between cross feeder to OHE.
It is also know as drop jumper in case of drop connection method jumpering.
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Aluminium Large jumper
Aluminium large jumper is used at the locations where return conductors is required to be connected to track and to connect all aluminium bus terminal of SP, SSP, SS locations.
| Table-1 [Jumper in 2x25kv, 50 Hz OHE , Where at- Catenary is 120 sqr.mm, Contact is 150 sqr.mm, ACW is 93.3 sqr.mm, LSW is 116.2 sqr.mm. | |||||
| Sr. No. | Type of jumper | Properties of jumper | Reason to used | PG required | Distance from nearest support |
| 1 | G-jumper (150 sqr.mm ) | Flexible copper stranded conductors Cross sectional area= 150 sqr.mm Diameter = 18.30 mm Length = 4.20 mtrs |
For providing feed path from one OHE shot to next OHE shot | PG 120/160 in Catenary (4 nos) PG 150/160 in Contact(4 nos) |
5.60 mtrs from from nearest bracket |
| 2 | F-jumper (50 sqr.mm) | Flexible copper stranded conductors Cross sectional area= 50 sqr.mm Diameter = 10.50 mm Length = 1.60 mtrs |
Used at IOL for feed continuities in cutting part of OR(out of run) wire. | PG50/120 in Catenary (2 nos) PG 50/150 in Contact (1 no) |
2.5 mtrs from OR bracket |
| 3 | ATJ- Jumper (50 sqr.mm) | Flexible copper stranded conductors Cross sectional area= 50 sqr.mm Diameter = 10.50 mm Length = 1.30,1.80,2.40 mtrs |
For prevent theft | PG-50/120 In run catenary to out run catenary(6 nos) | Adjusted from 15 to 20 mtrs |
| 4 | H-Jumper (50 sqr.mm) | Flexible copper stranded conductors Cross sectional area= 50 sqr.mm Diameter = 10.50 mm Length = 0.60 mtrs |
For providing proper current in Anticreep wire | PG-50/120 in Catenary to jumper PG-50/93.3 in ACW to jumper (Bimetallic to be used) |
Not specified |
| 5 | PH-Jumper (50 sqr.mm) | Flexible copper stranded conductors Cross sectional area= 50 sqr.mm Diameter = 10.50 mm Length = 1.50 mtrs |
For providing feed into LSW. | PG-50/120 in Catenary to jumper PG-50/116.3 in LSW to jumper (Bimetallic used) |
Not specified |
| 6 | T-jumper (150 sqr.mm) | Flexible copper stranded conductors Cross sectional area= 150 sqr.mm Diameter = 18.30 mm Length = 4.20 mtrs |
for feed continuities in UIOL | PG 120/160 in Catenary (4 nos) PG 150/160 in Contact(4 nos) |
5.60 mtrs from nearest bracket |
| 7 | Isolator jumper (Single pole) | Flexible copper stranded conductors Cross sectional area= 160 sqr.mm Diameter = 18.75 mm Length = Depend upon implantation of mast & isolator arrangement |
For feed sectioning in Catenary system | As per requirement | 3.0 mtrs (Approx.) |
| 8 | Isolator jumper (Double pole) | Flexible copper stranded conductors Cross sectional area= 160 sqr.mm Diameter = 18.75 mm Length = Depend upon implantation of mast & isolator arrangement |
For feed sectioning in Catenary & NFW | As per requirement | 3.0 mtrs (Approx.) |
| Table-2 [Jumper in 25kv, 50 Hz OHE, Where at- Catenary is 65 sqr.mm, Contact is 107 sqr.mm. | |||||
| Sr. No. | Type of jumper | Properties of jumper | Reason to used | PG required | Distance from nearest support |
| 1 | G-jumper (105 sqr.mm) | Flexible copper stranded conductors Cross sectional area= 150 sqr.mm Diameter = 18.30 mm Length = 3.80 mtrs to 4.10 mtrs |
For providing feed path from one OHE shot to next OHE shot | PG- 1031-2 = 8 nos | 5.60 mtrs from bracket |
| 2 | G-jumper (160 sqr.mm) | Flexible copper stranded conductors Cross sectional area= 150 mm sqr Diameter = 18.30 mm Length = 3.80 mtrs to 4.10 mtrs |
for feed continuities in OHE | PG- 1031-3 = 8 nos | 5.60 mtrs from bracket |
| 3 | F-jumper (50 sqr.mm) | Flexible copper stranded conductors Cross sectional area= 50 mm sqr Diameter = 10.50 mm Length = 1.60 mtrs |
Used in IOL for OR continuities | PG- 1041-2 (2 nos) PG 50/150 in Contact (1 no) |
2.5 mtrs |
| 4 | ATJ- Jumper (50 sqr.mm mm) | Flexible copper stranded conductors Cross sectional area= 50 mm sqr Diameter = 10.50 mm Length = 1.40,1.80,2.10 mtrs(not specified) |
For prevent theft | PG 1041-2 In run catenary to out run catenary(6 nos) with 10×50 SS bolt(12 spring washer) | Adjusted from 15 to 20 mtrs |
| 5 | H-Jumper (50 sqr.mm) | Flexible copper stranded conductors Cross sectional area= 50 mm sqr Diameter = 10.50 mm Length = 0.60 mtrs |
For providing proper current in Anticreep wire | PG-50/120 in Catenary to jumper PG-50/93.3 in ACW to jumper (Bimetallic used) |
Not specified |
| 6 | PH-Jumper (50 sqr.mm) | Flexible copper stranded conductors Cross sectional area= 50 mm sqr Diameter = 10.50 mm Length = 1.50 mtrs |
For providing feed into LSW. | PG-50/120 in Catenary to jumper PG-50/116.3 in LSW to jumper (Bimetallic used) |
Not specified |
| 7 | T-jumper (150 mm sqr) | Flaxible copper stranded conductors Cross sectional area= 150 mm sqr Diameter = 18.30 mm Length = 4.20 mtrs |
For providing feed path from one OHE shot to next OHE shot | PG- 1031-2 = 8 nos | 5.60 mtrs from bracket |
| 8 | Isolator jumper (Single pole) | Flexible copper stranded conductors Cross sectional area= 160 mm sqr Diameter = 18.75 mm Length = Depend upon implantation of mast & isolator arrangement |
For feed sectioning in OHE system | As per requirement | 3.0 mtrs (Approx.) |
| 9 | Isolator jumper (Double pole) | Flexible copper stranded conductors Cross sectional area= 160 mm sqr Diameter = 18.75 mm Length = Depend upon impanation of mast & isolator arrangement |
For feed sectioning in OHE system | As per requirement | 3.0 mtrs (Approx.) |
| 10 | C-jumper | Flexible copper stranded conductors Cross sectional area= 50 mm sqr Diameter = 10.50 mm Length = 1.60 mtrs |
for providing a parallel path for the current between catenary & contact wire | PG-1041-2 | Every 350 mtrs |