At KC India Test Laboratories LLP, we provide precise and standard-compliant Impulse Testing services for high-voltage equipment and insulation systems. This test is crucial to simulate lightning strikes and switching surges that electrical components may be subjected to during their operational life. By recreating these extreme transient events in a controlled environment, we help manufacturers and utilities verify the durability and design integrity of their electrical assets.

What is an Impulse Test?

Impulse Testing, also known as Lightning Impulse Test or Switching Impulse Test, evaluates the capability of an electrical device to withstand extremely high voltage transients (typically lasting a few microseconds). These impulses replicate the effect of:

  • Lightning strokes (1.2/50 μs waveform)
  • Switching surges in high-voltage systems (250/2500 μs waveform)

Impulse tests help determine the insulation strength and reveal any weak points or manufacturing defects that may not show up during regular high-voltage or dielectric tests.

Purpose of Impulse Testing

  1. Simulates Real-World Overvoltages: Assesses equipment response to natural and operational high-energy transients.
  2. Ensures Insulation Coordination: Helps in designing systems that can safely manage expected overvoltage stresses.
  3. Validates Design & Quality: Confirms equipment durability before dispatch or installation.
  4. Standard Compliance: Mandatory for high-voltage components as per IS, IEC, and IEEE standards.
  5. Reduces Field Failures: Detects internal flaws like voids, cracks, and poor connections before equipment is deployed.

What We Test

Impulse testing is typically conducted on:

  • Power and distribution transformers
  • Bushings and insulators
  • Circuit breakers and switchgear
  • Cables and cable terminations
  • Arresters and capacitors
  • Rotating electrical machines
  • High-voltage connectors and joints

Test Standards We Follow

We conduct impulse tests as per global standards, including:

  • IEC 60076-3 (Transformers – Insulation levels, dielectric tests)
  • IEC 60060-1 (High-voltage test techniques)
  • IS 2071, IS 10028, IS 13573, and others
  • IEEE Std C57.98, ASTM D1868 for material evaluation

Our Impulse Testing Capabilities

KC India Test Laboratories LLP is equipped with a modern impulse test setup, including:

  • High-energy impulse generators (up to several hundred kV)
  • Precision voltage dividers and digital oscilloscopes
  • Waveform control systems to achieve standard front and tail times
  • Automated recording and analysis tools
  • Shielded and grounded impulse testing bays for safety

Each test includes waveform verification (wave shape, peak voltage, time to front, and time to half-value) and fault observation using oscillographic or digital monitoring.

We offer:

  • Full-wave and chopped-wave testing
  • Impulse voltage polarity reversal (for certain applications)
  • Failure analysis and post-test evaluation

Why Choose KC India Test Laboratories LLP?

  • NABL Accredited Facility with ISO/IEC 17025 certification
  • Experienced Engineers in high-voltage and insulation diagnostics
  • Precision Equipment ensuring accurate waveform generation and measurement
  • Comprehensive Test Reports with waveform traces, data logs, and pass/fail status

● Custom Test Solutions for transformers, switchgear, and specialty components