What is PD IEC TS 62749 about?
PD IEC TS 62749 specifies the expected characteristics of electricity at the point of supply of public low, medium, and high voltage, 50 Hz or 60 Hz, networks, as well as power quality assessment methods.
While power quality is related to EMC in a number of ways, especially because compliance with power quality requirements depend on the control of the cumulative effect of electromagnetic emission from all/multiple equipment and/or installations.
NOTE 1: The boundaries between the various voltage levels can be different for different countries/regions. In the context of this TS, the following terms for system voltage are used:
- Low voltage (LV) refers to UN ≤ 1 kV
- Medium voltage (MV) refers to 1 kV < UN ≤ 35 kV
- High voltage (HV) refers to 35 kV < UN ≤ 230 kV
NOTE 2: Because of existing network structures, in some countries/regions, the boundary between medium and high voltage can be different.
Who is PD IEC TS 62749 for?
PD IEC TS 62749 on characteristics of electricity supplied by public networks is relevant to:
- Electrical engineers
- Suppliers of power quality measuring instruments
- Power tech labs
- Public electricity networks and suppliers
Why should you use PD IEC TS 62749?
The description of electricity is of fundamental importance within electricity supply systems. In the past, its characteristics depended less on its generation than on the way in which it was transported by networks and is being used by the equipment of multiple users. Nowadays, Smart Grid construction and massive deployment of renewable energy sources increase the complexity of power quality management.
PD IEC TS 62749 describes a common set of power quality (PQ) indices and measurement methods in order to allow different system operators to measure and report power quality in a consistent manner. PD IEC TS 62749 helps in optimizing power quality that is carried out in a cost-effective manner to balance network user power quality requirements and willingness to pay for it with power quality supply costs. PD IEC TS 62749 recommends a range of values, or options, while still ensuring the coordination of disturbance levels between different parts of the system or voltage levels.
Overall, PD IEC TS 62749 is helpful as it provides operating conditions of a public electricity supply system typically including all generation variations, load variations, and reactive compensation or filter states (e.g., shunt capacitor states), planned outages, and planned arrangements during maintenance and construction work, non-ideal operating conditions and normal contingencies under which the considered system has been designed to operate.
What’s changed since the last update?
PD IEC TS 62749:2020 includes the following significant technical changes with respect to the previous edition:
- Minimum number of remaining data for weekly analysis
- Improvement of the compatibility between EN 50160 and IEC TS 62749
- Further explanation of the conception of daily sliding window
- Further explanation of the aggregation method used for events
- Further explanation of the relation between Power Quality and EMC
