Abhijeet Limaaye’s Post

#Impulse_Voltage_Testing_for_MV_Power_Cables_and_Accessories: The impulse voltage test for medium voltage power cables & accessories shall be performed in compliance with IEC 60502, IEC 61442 and IEC 60230 standards. According to IEC 60230, the impulse waveform shall have a front time between 1 μs and 5 μs and time to half the peak value between 40 μs and 60 μs, conforming to IEC 60060-1 requirements. 10 impulses of each polarity shall be applied on each test sample. For three-core specimens, each phase is tested separately, with other two phases grounded. #Test_at_elevated_temperature: The cable conductor shall be heated and stabilized at a temperature 5 K to 10 K above the maximum operating temperature for extruded insulation cables. This temperature shall be maintained and stabilized for at least 2 hours, before and during the impulse test. #MV_Cables #MV_accessories #MV_Termination #MV_Joint #IECStandards #ElectricalTesting

Impulse test on MV power cables and accessories

Temperature Rise Tests in IEC 61439-1 (Low-voltage switchgear assemblies).

NEMA BI-50022-2024   A Brief Comparison of #NEMA EN 10250—#Enclosures for Electrical Equipment (1000 Volts Maximum)  and IEC 62208 Empty enclosures for #low-#voltage #switchgear  and #control gear assemblies – General requirements 

The short-time and peak withstand current tests for medium voltage switchgear and controlgear shall comply with IEC 62271-1:2017 and IEC 62271-200:2021 standards. #Key_Points: #Rated_Short_Time_Withstand_Current: It is the RMS value of the short-circuit current the switchgear can handle in a closed position for its rated duration under service conditions. The values are selected from the R10 series (1, 1.25, 1.6, 2, 2.5, 3.15, 4, 5, 6.3, 8, or their multiples of 10) as specified in IEC 60059. #Rated_Peak_Withstand_Current: This is the peak current during the first major loop of the short-time withstand current. It is calculated by multiplying the RMS value of the short-time withstand current by a peak factor, which depends on the DC time constant and the rated frequency. A DC time constant of 45 ms covers the most cases: For 50 Hz: Peak factor = 2.5 For 60 Hz: Peak factor = 2.6 #Preferred_Short_Circuit_Duration: The recommended duration is 1 second, though other durations like 0.5 s, 2 s, or 3 s can be used. #Post_Test_Requirements: After the test, the switchgear must: Show no significant deterioration. Operate normally. Handle its rated continuous current. This ensures the switchgear meets performance and safety standards. #Switchgear #TypeTesting #ShortCircuitTest #HighPowerLab #IEC62271

🚨 Key Updates to IEC 62052-31: 2024 – Are You Ready? The updated IEC 62052-31: 2024 safety standard brings essential changes for manufacturers of electricity meters and load control equipment, including: ✅ Expanded voltage coverage (up to 1500 V AC/DC) ✅ Enhanced safety for batteries and surge protection devices ✅ Provisions for DC meters and EVSE-related applications Understanding these updates is crucial to staying compliant and competitive. At NMi, we’re here to guide you through the changes with practical advice and tailored support. 📖 Read our blog to learn more and ensure your products are ready for the new standard: [https://lnkd.in/efz7-Tug #WeAreNMiGroup #IEC6205231 #Compliance #ElectricalStandards #SafetyStandards

Electrical panel boards should be installed per the separation requirements stated in BS EN 61439-2 and IEC 61439-2. the attached file from Schneider Electric discusses the difference between the two stated standards.

Learn how to meet the IEC 61000-4-11 inrush current requirements without breaking the bank. Discover cost-effective solutions to achieve the necessary 500A inrush current for voltage dips and interruptions testing, including the innovative CAB 1001 Inrush Compensator. Ensure your equipment meets standards and performs reliably in rigorous testing environments. 📖 Read the full article https://zurl.co/ujve #EMC #InrushCurrent #Testing #Engineering #AbsoluteEMC

Power cables vary widely, with standards determined by usage. Most power cables have two names since each connection type has a name. The primary power cable standards are NEMA and IEC.

IEC/EN 61439-1/2 In 7500A Low Voltage Switchboards