Important Technical Standards for Power Quality

Standard	Standard Description
IEEE 519	Recommended Practice and Requirements for Harmonic Control in Electric Power Systems
IEE 1159	Recommended Practice for Monitoring Electric Power Quality
IEC 61000-4	Electromagnetic compatibility
IEC 61000-4-30	Power quality measurement methods
IEC 61000-4-7	Testing and measurement techniques – General guide on harmonics and interharmonics measurements andinstrumentation, for power supply systems andequipment connected
EN 50160	Voltage characteristics of electricity supplied by public electricity networks
SEMI F47	The Voltage Sag Immunity Standard as per association for the semiconductor industry
CBEMA PQ Graph	CBEMA Power Quality Graph, power quality graph plots the depth of voltage sags on the vertical axis against the duration of voltage sags on the horizontal axis.

Standard

Standard Description

IEEE 519

Recommended Practice and Requirements for Harmonic Control in Electric Power Systems

IEE 1159

Recommended Practice for Monitoring Electric Power Quality

IEC 61000-4

Electromagnetic compatibility

IEC 61000-4-30

Power quality measurement methods

IEC 61000-4-7

Testing and measurement techniques – General guide on harmonics and interharmonics measurements andinstrumentation, for power supply systems andequipment connected

EN 50160

Voltage characteristics of electricity supplied by public electricity networks

SEMI F47

The Voltage Sag Immunity Standard as per association for the semiconductor industry

CBEMA PQ Graph

CBEMA Power Quality Graph, power quality graph plots the depth of voltage sags on the vertical axis against
the duration of voltage sags on the horizontal axis.

What is the default arc flash boundary?

NFPA 70E establishes the default arc flash boundary at 4 feet for low voltage (< 600V) systems where the total fault exposure is less than

IEEE 519-2014 Voltage distortion limits

For Electrical Network with non linear loads, Voltage Distortion limits are defined in IEEE 519. To ensure Quality Power Supply to Assets, Mitigate !!

Current Transformer Accuracy Class as per IEC 61869-2

Current transformer Accuracy class is highest permissible percentage error at rated current for that accuracy class, as per IEC 61869-2 and IS 2705.

Burns caused by Arc Flash

Degree of severity of burns is based on size and depth of the burn on human body. Fire, steam, Radiation, chemicals, Electric Arc, can cause burns.

Comparative Tracking Index (CTI) for Insulating Material group – IEC 60112

CTI is max voltage which material can withstands 50 water drops without without formation of conductive path.

Current Transformer Phase Displacement as per IEC 61869-2

In Practice there wiill always difference in phase displacement between primary and secondary currents, Allowed limits are defined in IEC 61869-2.

What is Internal Arc Protection in Low Voltage ASSEMBLY ?

Internal Arc Protection ensures Personal and ASSEMBLY protection under arcing conditions due to low impedance path, cause of electrical explosion.

What is MicroGrid ?

Microgrid is a group of interconnected loads and distributed energy sources within defined electrical boundaries that acts as a single controllable grid.

Typical safe ability of Transformer, Generator and Cable to withstand Isc – short circuit fault

Typical safe ability of Transformer, Generator and Cable to withstand Isc – short circuit fault current in multiple of its In – rated current, without damage to the equipment.

Important Technical Standards for Power Quality

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