Switchgear Short Time Current Test Setup for Temperature Rise Testing

Product Details

The CKINSTO Short Time Current Test Setup is a specialized apparatus designed to evaluate the performance and durability of electrical components, particularly switchgear items (like circuit breakers, fuses, and protective relays), under short-duration, high-current conditions. Its primary function is to verify the component's Short-Time Withstand Current ($I_{cw}$) capability.   Key Purpose of the Test Setup   The short-time withstand current test ensures that the switchgear's main circuit, specifically the busbar system, can tolerate the severe thermal and mechanical stresses that occur during a massive fault current (short-circuit) for a specified short time (typically 1 or 3 seconds) without sustaining damage that compromises its subsequent operation. Mechanical Stress: The enormous electromagnetic forces (electrodynamic forces) developed by the high peak current (often $2.1$ to $2.2$ times the RMS value) can cause busbars to deform, crack insulators, or damage supporting structures. Thermal Stress: The rapid heating ($I^2Rt$ losses) over the short duration can cause the conductors to soften, potentially reducing their mechanical strength or causing excessive temperature rise. The test setup is designed to simulate these fault conditions in a controlled laboratory environment.   General Description and Features   While the exact specifications may vary by model (e.g., CKINSTO-STOTS-0012 or CKISNTO-CTCTS-0012), the CK INSTO Short Time Current Test Setup typically includes: High-Current Source: A powerful unit (often based on a specialized transformer or current injector) capable of supplying a very high RMS current (e.g., up to $40,000$ A, or $40$ kA) for a very short, precise duration (e.g., $0.2$, $1.0$, or $3.0$ seconds). Microcontroller/PLC Based Control: The system is usually automatic and controlled by a Micro Controller with a Touch HMI (Human-Machine Interface) for setting the test parameters (current magnitude and duration). Measurement and Monitoring: Integrated instrumentation to accurately measure and record the applied RMS current and the instantaneous peak current. Test Fixture: A robust area and connection points (often Copper Busbars) where the switchgear item (like a busbar section) is connected for current injection. Construction: Typically housed in an enclosure made of Mild Steel (MS) for durability and safety. Compliance: The test is performed according to international standards such as IEC 61439-1 for Low Voltage Switchgear, which details the procedure and passing criteria.   Passing Criteria:   To pass the test, the component must: Remain intact without any permanent deformation, breakage, or cracks in the busbars or insulators. Maintain insulating and mechanical characteristics. Be fully operational after the test (e.g., a circuit breaker must be able to switch ON and OFF).