Insulation Resistance Testers (IR Testers)

Vibration & Phase Current Signature Analysis can be used to find
out following defects:

• Motor Rotor eccentricity Motor Rotor Bar Cracks
  
• Misalignment or Bend Shaft
  
• Motor Rotor Bar looseness
  
• Foundation defect / soft foot
  
• Electrical defect in motor
  
• Mechanical looseness
  
• Defective belt drives
  
• Unbalance in a Rotor
  
• Damaged Bearings
  
• Gear defects
  
• Resonance
  

Winding Resistance Measurements:

The test is most effective when compared with such measurements
10 RLA/Testing of H. T. Motor/Generator from similar motor/generator, or previous test results or factory test data. It gives the full information of abnormalities like loose connections, broken strands etc. It even identify other issues like unbalance that result in overheating & circulating events.

Insulation Resistance Polarization Index [IR/PI]:

Insulation Resistance and Polarization Index is the most commonly Practiced and accepted test in identifying dryness/wetness of paper insulation. The life of motor/generator is mainly based or is very sensitive to amount of moisture content in paper insulation. This test gives information on aging condition or status of the insulation, moisture content in paper and hence is a very important test for identifying residual life.

Dielectric Loss Measurement (Capacitance & Tan-Delta):

A high loss may indicate problems in the insulation structure. Normal aging of an insulating material will cause dielectric loss to increase. Contamination of insulation by moisture or chemical substances may cause losses to be higher than normal. Physical damage from electrical stress or other outside forces also affects the level of losses. A dielectric loss testing program provides several important benefits. Periodic tests performed during the service life of the equipment can indicate that the insulation is either aging normally or deteriorating rapidly. Diagnostic tests may disclose the location of a fault, or the reason for failure.

These sets have facility for checking insulation resistance in the range of 1 meg ohm to 10 million meg ohm after one minute of charging. Intrinsic value of insulation resistance if required, even with capacitive loads. Separate push button controls and visual indicators for "Charge", and "Discharge" function are ideally suited for rapid and safe testing of components in a factory. Maximum output current has been limited to safe value to eliminate the risk of serious shock to operators. The instruments are available in two models as per specifications given overleaf.

Features:

• Completely solid state circuitry, hence drift free operation
  
• Fully protected against all overload and short circuits
  
• Suitable for testing ' EARTHED' Samples
  
• Tests as per I. S. I. recommendations
  
• Push Button Controls for rapid testing
  
• Suitable for testing insulation liquids
  
• Wide measurements range
  
• Guard Terminal provided
  

Technical Specifications:

Overload Protection: Fully protected against wrong selection of breakdown of components under test.
Power Supply: 230V AC ± 15%, 50 Hz Single Phase
Resistance Range: 1 Meg to 10 Meg in 6 ranges
Indication: 4¼ Taut Band Panel Meter
D.C Voltages:
For Model IRT-500:- 63V, 100V & 500V ± 2%
For Model IRT-1000:- 100V, 250V, 500V & 1KV ± 2%
Warm up time: One minute
Weight: Less than 7 Kg

Application Areas:

• Ceramic Capacitors
  
• Semi Conductors
  
• Plastic Capacitors
  
• Paper Capacitors
  
• Transformers
  
• Connectors
  
• Insulators
  
• Switches
  
• Motors
  

We Provide Calibration services for Electro-Technical Field Instruments :

• Digital /Analouge Multimeter
• Digital / Analouge Earth Tester
• Digital / Analouge Insulation Resistance Tester
• High Voltage Tester
• Clamp on Meter
• High Voltage Probe
• Capacitance & Tan Delta
• Brake Down voltage Tester
• Temperature (0 to 150 Degree)