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Products : Transportation Sector (Rail Road Application) : Control Switchgear : Relays:Protection Relays
Protection Relays
      Product Details
      Salient Features
      Applications
      Technical Specifications
       
      Product Details
     
Autometers Alliance Ltd offers top of the line Protection Relays suitable for electric traction vehicles. Designed to withstand extremes of mechanical and thermal stresses, the product has a proven track record for reliability.
       
      Salient Features
     
  • Plug-in design for simple mounting and easy checking.
  • Minimum maintenance.
  • Quick response time.
  • Compact and lightweight design.
  • Rugged construction with proven performance under varying condition.
  • Adjustable tripping current/voltage value as per requirement.
  • High insulation level.
  • High repeatability at the set value.
  • High mechanical and electrical endurance.

Types

  • Current Operated (DI) Relays: QLM, QRSI, QE, QF, QLA and MCR relays.
  • Voltage Operated (DU) Relays: QOP, QOA and Q30 relays.

Applications

The relays are designed for protecting electric locomotive equipments & circuits:

  • Main transformer against overloading.
  • Excitation windings of traction motors and rheostatic braking resistance against over current.
  • Auxiliary equipments against overloading.
  • Silicon Rectifier against overloading.
  • Main power circuit and auxiliary circuit against earth fault.
  • Locomotive's electrical equipment against drop of OHE voltage below minimum value.
       
      Technical Specifications
     

Designation

QLM

QRSI

QE

QF

QLA

MCR

Set value customised

3.75-9.9
A AC, 50Hz

3.75-9.9
A AC, 50Hz

3.75-9.9
A AC, 50Hz

3.75-9.9
A DC

5±5%
A AC, 50Hz

2.1-7.5
A AC, 50Hz

No. of contacts customised

2 NC/2NO/1NC+ 1NO

2 NC/2NO/1NC+ 1NO

2 NC/2NO/1NC+ 1NO

2 NC/2NO/1NC+ 1NO

2 NC/2NO/1NC+ 1NO

2 NC/2NO/1NC+ 1NO

Coil resistance at 20°C

30m ? ±8%

30m ? ±8%

30m ? ±8%
 

30m ? ±8%
 

30m ? ±8%

89.5m ? ±8%
 

Pick-up time

<70msec

<70msec
 

<70msec
 

<70msec
 

<70msec
 

<70msec
 

Dropout time <60msec <60msec <60msec <60msec <60msec <60msec

 

Contact
rating

Making current at 110v (DC)

2A

2A

2A

2A

2A

2A

Breaking current at 220v (AC)

2A

2A

2A

2A

2A

2A

Dielectric test

Contact to earth

2.0 kV

2.0 kV

2.0 kV

2.0 kV

2.0 kV

2.0 kV

Coil to contact and earth

2.0 kV

2.0 kV

2.0 kV

2.0 kV

2.0 kV

2.0 kV

Adjacent contact

1.5 kV

1.5 kV

1.5 kV

1.5 kV

1.5 kV

1.5 kV

Weight

1.2 kg

1.2 kg

1.2 kg

1.2 kg

1.2 kg

1.2 kg

Designation

QOP

QOA

Q30

Set value

72-125 V DC
V dc

72-125 V DC
V dc

290-500 V AC, 50Hz
V ac, 50Hz

No. of contacts customised

2 NC/2 NO/1 NC+1 NO

2 NC/2 NO/1 NC+1 NO

2 NC/2 NO/1 NC+1 NO

Coil resistance at 20°C

1800 ohm 
± 8%

1800 ohm
± 8%

1800 ohm 
± 8%

Pick-up time

<70
msec

<70msec

<70msec

Dropout time

<60
msec

<60msec

<60msec

 

Contact
rating

Making current at 110v (DC)

2A

2A

2A

Breaking current at 220v (AC)

2A

2A

2A

Dielectric test

Contact to earth

2.0 kV

2.0 kV

2.0 kV

Coil to contact and earth

4.8 kV

4.8 kV

3.0 kV

Adjacent contact

1.5 kV

1.5 kV

1.5 kV

Weight (approx.)

1.2 kg

1.2 kg

1.2 kg