european utility week, 3-5-november 2015, vienna power ... · events originated through...

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Power Quality

Applicable standards and benefits for large

energy consumers

European Utility Week, 3-5-November 2015, Vienna

Restricted © Siemens AG 2015 All rights reserved.

2015-11-04 Manfred Unterweger

Agenda

•A real “Power Quality” Crime

•Cause and Effect

•What to Do? - The ABC Approach

•Applicable Standards

•Customer Application

•Benefits of PQ Measurements



Power Quality

A real „Power Quality“ Crime

The Crime Scene: Automotive Industry,

Body Shop - Welding of Car Body

What happened: One robot stopped operation during welding process

Consequences: One complete car body hit the ground

Impact: Damaged car body, damaged production cell, interruption of

production process – loss of capacity



Power Quality

Cause and Effect (1)

• Influences and disturbances originated outside a plant:

• Unpredictable events e.g. weather (lightning strikes, snow loads) etc.), other specific events originated through disturbances/errors in the power supply infrastructure e.g. cable damage (excavation work)

• Phenomena: Dips, swells, interruptions, dips, swells, transients

• Continuous disturbances through infeed of already weak quality of the supplied power originated from other connected customer. e.g. non-linear loads e.g. welding transformers, switching of big loads, inverters

• Phenomena : Variation of the supply voltage, frequency variation, dips, harmonics, flicker

1

1



Power Quality

Cause and Effect (2)

• Influences and disturbances originated inside a plant:

• Unpredictable events e.g. shortcuts in the entire network, overload conditions, switch on/off of big loads

• Phenomena : Variation of the supply voltage, dips, interruptions, harmonics, flicker

• Continuous disturbances e.g. originated through non-linear loads like inverter-fed drives, big oscillating loads, electrolysis ovens, welding robots as well as earthing problems

• Phenomena : Variation of the supply voltage, harmonics, interharmonics, flicker, unbalance

2

2



Power Quality

What to Do? - The ABC Approach

A

B

C Measure Evaluate Optimize

• Ensure that the optained energy is according to a defined supply quality.

• Ensure that negative influences to the connected power supply network are within a certain limit.

•Continuous measurement of

relevant parameters at important

points in the power supply

network:

• Point of coupling: In-feed from the utility

• Transformer feeders

• Point of coupling of specific production

units/lines

• Big loads causing disturbances

• Use of standardized measurement methods

(Class A, Class S)

•Concentrate, analyze and evaluate

recorded parameters:

• Assigning data to the point where they are

measured

• Evaluate data according to necessary limits

and criteria (z.B. EN 50160)

• Identification of trends, deviations and limit

value violations together with the duration and

value

• Assigning evaluation results to the related

points

• Identification of possible originator of the

disturbance

•Definition of proper mitigation

measures:

• Dedicated energy supply contract with a

defined level of Power Quality

• Filters, redundancies etc.

• Process optimization

• Use of less sensitive devices and equipment



Power Quality

Applicable Standards

Evaluation Standard Measurement Methods Product Standard

IEC 62586-1 EN 50160

IEC TS 62749

IEC TR 61850-90-17 IEEE 1159.3 IEC 60225 / IEEE Std C37.111

Data Exchange and Communication Standards

IEC 61000-4-30 Testing and measurement

techniques- Power Quality

measurement methods

Power Quality Instruments

General guide on harmonics and

interharmonics measurements

Using IEC 61850 to transmit

power quality data

Recommended practice for the

transfer of PQ data: PQ Diff

Assessments of power quality

characteristics of electricity

supplied by public networks

Voltage characeteristics of

electricity supplied by public

network

IEC 61000-4-7

IEC 61000-4-15

Flickermeter – Functional and

design specification

IEC 62586-2

Functional test and uncertainly

requirements

Measuring relays & protection

equipment, Part 24: COMTRADE



Customer Application

Power Quality Monitoring in an Industrial Area (1)

… Measurement Points




Power Quality Monitoring in an Industrial Area (2)

. . .

20 x Protection Relays

Power Quality System

12 x PQ Recorder (Class A)

HMI

PQ-Evaluation Station

Protection &

Substation Automation

System




Typical Power Quality Recordings (1)

Voltage Profile (LV) Harmonics Profile (LV)

Voltage Profile (MV) Voltage DIP (MV)




Typical Power Quality Recordings (2)

Voltage DIP (MV)



Power Quality

Benefits of PQ Measurements

• Establish transparency of Power Quality

• Check compliance with regulations and grid codes

• Reduction process interruptions and downtime

• Avoidance of penalties

• Improvement of safety

• Saving money

Power Quality measurement is an integral part of the

quality assurance policy!



Manfred Unterweger

Head of Product Promotion

EM DG PRO S PROM

Phone: +49 (911) 433-7614

Mobile: +49 (173) 3828894

E-mail:

[email protected]

Thank you very much for your attention!

siemens.com/answers

mailto:[email protected]

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