Mohamed Elbaz, PMP®,RMP®,LEED®GA™’s Post

👉 What is IEC 61000-4-30? IEC 61000-4-30 is an international standard that defines the methods for measuring and interpreting power quality parameters in a.c. power supply systems. Let me break it down for you: 1. Purpose: The standard provides guidelines for accurate and repeatable measurements of various power quality parameters, ensuring reliable results regardless of the instrument used. 2. Frequency Range: It covers conducted phenomena in power systems with a declared fundamental frequency of either 50 Hz or 60 Hz. 3. Parameters Covered: - Power Frequency: Measurement of the fundamental frequency of the supply voltage. - Magnitude of the Supply Voltage: Determining the voltage level. - Flicker: Assessing voltage fluctuations. - Supply Voltage Dips and Swells: Detecting sudden voltage changes. - Voltage Interruptions: Identifying voltage dropouts. - Transient Voltages: Capturing rapid voltage variations. - Supply Voltage Unbalance: Evaluating voltage imbalances. - Voltage Harmonics and Interharmonics: Analyzing harmonic content. - Mains Signaling on the Supply Voltage: Detecting any signaling superimposed on the voltage. - Rapid Voltage Changes (RVC): Measuring abrupt voltage transitions. - Current Measurements: Now a normative method (previously informative). 4. Additional Considerations: - Emissions in the 2 kHz to 150 kHz Range: Addressed in informative Annex C. - Over- and Underdeviations: Covered in informative Annex D. - Class A and Class S Measurement Methods: Defined and clarified. - Class B: Moved to informative Annex E and considered for future removal. - Responsibility for Influence Quantities and Test Procedures: Transferred to IEC 62586-2. This standard ensures that power quality instruments provide consistent and reliable results, making it essential for monitoring and predictive maintenance of equipment. 🤠 #mrelectricianaip

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.

#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

🌡 What's the Difference Between °C and K in IEC 61439-1? 🌡 When dealing with temperature measurements in electrical systems, particularly in the context of IEC 61439-1, it's crucial to distinguish between degrees Centigrade (°C) and Kelvin (K). In simple terms: • °C (Degree Centigrade) is the absolute temperature we measure. • K (Kelvin) is the temperature rise above the ambient temperature. For example, if we measure an absolute temperature of 95°C at a specific point during a test, with an average ambient temperature of 25°C: • °C = 95°C • K = 95°C - 25°C = 70K According to IEC 61439-1 Clause 10.10, understanding and applying these measurements is vital for accurate thermal assessment and ensuring compliance with the standard. #Engineering #TemperatureMeasurement #IEC61439 #ElectricalTesting #Compliance #LowVoltage #ControlGear #Switchgear #Standards #ElectricalEngineering #ThermalManagement #TestLab #IEC #temperaturerise

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

📢 Understanding Short-Circuit Withstand Strength in Low Voltage Switchgear Assemblies (IEC 61439-1:2020 Clause 10.11) 📢 Q: Can we assign additional short-circuit ratings by keeping I²t constant? A: Yes, by maintaining I²t constant, it is possible to assign additional short-circuit ratings. Q: Can a customer who tested an Icw rating of 80kA for 1 second request a 50kA rating based on these results? A: Yes, the manufacturer can declare a dual rating if the peak condition (I²t) is met. Q: How do we calculate the duration for the additional rating? A: Here’s the calculation process: • Ensure the peak condition is met (80kA peak meeting 50kA required peak). • Use the formula: (80)² x 1 = (50)² x t 6400 = 2500 x t t = 6400 / 2500 t = 2.56 seconds Q: What does this calculation mean? A: By testing 80kA for 1 second, the manufacturer can also declare a 50kA rating for 2.56 seconds. This method ensures that assemblies meet the necessary safety standards while providing flexibility in rating declarations. Understanding these calculations can help manufacturers and clients ensure compliance and optimize their switchgear assemblies. 🔧💡 Stay informed and compliant with IEC 61439-1:2020 standards! #IEC61439 #ElectricalEngineering #Switchgear #ShortCircuit #Compliance #Testing #ElectricalSafety #EngineeringExcellence

Hi all, right now I was looking at IEC 60287-1-1 for some reason that I came across an error which is repeated pretty much throughout the document and it is mixing between resistance and resistivity which is the case of confusion and needs to be corrected. For instance, in the section 3.1 Symbols there are ac and dc resistance of cable conductor and cable sheath followed by thermal resistance (not resistivity) of insulation layers and surrounding medium! And this mistake is being repeated throughout the document wherever there is a reference to thermal resistivity. Did you have the same experience with this standard?

The utility interface equipment shall be earthed / grounded in accordance with IEC 60364-7-712. Resistance between any point of the PV system and earth should be as smaller as possible and it is recommended to have a value less than 10Ω at any time. 

Reliability testing standards are guidelines and procedures that specify the methods, conditions, and criteria for testing the reliability of power electronics. They are developed and issued by various organizations and agencies, such as IEEE, IEC, UL, and MIL. Reliability testing standards can help you ensure the quality and consistency of power electronics by following the best practices and recommendations for reliability testing and reporting.