Role Overview
We are seeking a highly skilled Application Engineer with strong expertise in energy metering technologies, including developing metrology (single & three phase) , DLMS/COSEM protocol, and energy meter hardware architecture.
Education
Bachelor's degree in electrical engineering, Electronics, Instrumentation, or related fields. Master's degree is a plus.
Key Skill Set
Strong Understanding of Electrical Measurement Principles:
- Fundamentals of AC power measurement (singlephase & threephase)
- RMS calculations for voltage, current, power & energy
- Concepts of active, reactive, apparent power
- Power factor measurement (displacement & distortion PF)
- CT/PT interfacing, burden selection, linearity, and phaseangle correction
- Antitamper metering concepts (neutral disturbance, magnetic tamper, bypass detection)
Expertise in Metrology Algorithms
- Implementation of sampling, digital filtering, and signal conditioning
- Frequency tracking & phaselocked loop (PLL) algorithms
- Compensation techniques for:
- Gain & offset errors
- Phase angle errors
- Temperature drift
- Energy calculation algorithms (block processing, timedivision sampling, etc.)
- Lowsignal detection, creep handling, and startup threshold logic
ADC & Sensor Interface Knowledge
- Experience with (SigmaDelta) ADCs, multichannel highresolution converters
- Understanding sampling rate, aliasing, ENOB, quantization noise
- Design and calibration of current sensors:
- Shunts
- CTs
- Rogowski coils
- Hall sensors
- Noise isolation, grounding, and analog frontend design
DLMS/COSEM Knowledge (for Smart Meters)
While metrology is separate from DLMS, a metrology engineer should understand how measured parameters map to communication standards:
- OBIS code mapping for power & energy registers
- COSEM interface objects related to billing, load profiles, events
- Security suites (Suite 0 / Suite 1 / Suite 2)
- Interoperability testing with HES/MDM
- DLMS data structures for profile capture & metering blocks
Calibration & Accuracy Testing
- Handson experience with meter test benches (ZERA, Radian, Secure, L&T)
- Multipoint calibration techniques:
- Voltage, current, phase angle, power factor
- Accuracy standards:
- IS 16444 (Smart Meters)
- IS 15959 (DLMS)
- IEC 6205321/22/23
- Endurance, creep, tamper, harmonic, and influence quantity testing
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