EQL
Electricity Quality and Load
Power quality monitoring and energy
metering for electric power networks
Seppo Vehviläinen
Technical Manager, MX Electrix Oy
seppo.vehvilainen@electrix.fi
tel. +358 3 5784847
gsm. +358 40 5797844
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Who are we?
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founded in 1988
owners Tiina and Seppo Vehviläinen
turnover 0.4M Euro
business area measuring of electric energy
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digital energy meters
software applications
consulting
training
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Who are we?
• Production of digital energy meters since 1989
• Co-operation with the technical Research Centre of
Finland and the Technical Universities of Helsinki and
Tampere
• products
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energy kWh-kvarh meters
power quality monitoring meters
metering systems
automatic remote reading applications
analysing software (made by Enease Oy)
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EQL® power quality
monitoring Voltage
From monitoring
to analysing
Interruptions
Voltage dips
Distortion
Harmonics
Unbalance
Active energy
Reactive energy
Apparent energy
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Sener recommendation to the power quality
monitoring in Finland Continuous
Feeder
Transformers
Users
110/20 kV
20/0,4 kV
monitoring
Voltages
Voltage dips
Interruptions
THD
P,Q,I
Cont./temporary
P,Q,I
Voltages
Voltage dips
Interruptions
THD
U2/U1 , U0/U1
Flicker
Temporary
Voltages
THD,3,5,7,9,11,13
U2/U1 , U0/U1
Voltage dips
Interruptions
P,Q,I
Flicker
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The power quality
• The electricity market act:
– Must meet the customers reasonable
needs.
– Must be as agreed between the network
operator and the customer.
– Must fit to the standards (EN-50160).
• Only way to get information on PQ is to
use metering devices.
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EQL (Electricity Quality and Load)
• EQL is a power quality monitoring system for the
power distribution networks.
• EQL is a complete solution for monitoring the power
quality from the feeding station to the customer.
• EQL meters can be integrated with temperature
meters to monitor also temperatures in the location.
• EQL applications make power quality reporting and
monitoring easy.
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EQL (Electricity Quality and Load)
• EQL grows and develops according to the
customers needs:
– A single EQL meter can be read locally with a
portable computer.
– EQL meter is possible to connect to telephone or
GSM network and read remotely and
continuously.
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EQL (Electricity Quality and Load)
• EQL metering systems have been used in
electric utilities for several years .
– The EQL metering system is already selected by
several electric utilities.
– The long experience has proven that EQL is a
reliable system.
– EQL metering system can be developed optimally
while the customer requirements for power quality
grow.
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EQL (Electricity Quality and Load)
• EQL benefits
– Continuous metering and monitoring in the distribution
network + automatic event logging
– Fast handling of the customer reclamation: immediate
metering with EQL and reporting to the customer
– Accurate information on the transmission capability of the
network.
– Accurate evaluation of the benefits of the network
reinforcements
– Customer service: the customer can get an energy
consumption report with the power quality report
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EQL power quality monitoring and reporting
Voltage
Temperature
Power station
EQL
Frequency
Dips
EQL
Harmonics
Flicker
Telephone
Symmetry
Current
Sub station
Customer
Swells
EQL
Interruptions
GSM
EQL
Monitoring,
analysis
and reporting
Mobile metering
Automatic remote
meter reading
Local reading and
reporting
Meter reading database
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EQL-QR software for PQ monitoring and reporting
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EQL QUALITY ANALYSIS AND REPORTING
Quality factors and acceptance limits EN50160
Upper limit for quality errors
Critical limit
95% limit
Median
N
Voltage level
Range
Symmetry
U2/U1 U0/U1
DC voltage
THD
Frequency
Voltage level -10% limit
Umin
Voltage level - lower limit
Critical limit
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EQL quality metering and customer service
1) Install and read 2) Fast analysis and
the EQL meter
reporting
EQL
The customer has
problems with the
power quality
The customer
is informed and
advised to solve
the problem
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EQL technology
1) Microprocessor based energy meter
with quality metering capability.
2) Data collecting, reporting and
analysis software for PC.
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EQL Meter 1(2)
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Memory registering energy/quality meter,
that can be read automatically (phone
line/GSM):
– Energy meter: active power and reactive
power, three phases and total
– Apparent energy, three phases and total
– Quality metering
– impulse outputs (active/reactive energy)
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Meter versions:
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Direct connection meter:
3 * 230/400 V, 5(60) A, 50/60 Hz
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Transformer connection meter:
3 * 230/400 V, 5 A, 50/60 Hz
3 * 100/57,7 V, 5 A, 50/60 Hz
3 * 110/63,5 V, 5 A, 50/60 Hz
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EQL Meter 2(2)
• Interruptions
• Voltage quality metering
– Measurements values (1 min … 120 min periods)
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Voltage level in each phase
Voltage unbalance (negative sequence)
Voltage total harmonics distortion (THD) in each phase
Voltage odd harmonics 3,5,7,9,11,13
Flicker Pst
Frequency
Voltage unbalance (zero sequence)
DC voltage in each phase
Power factor PF in each phase
50 Hz reactive power in each phase
Current in each phase
Voltage dips and rises registered in each phase
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Voltage dips 1(2)
Meter
TESTIMITT1
TESTIMITT1
TESTIMITT1
TESTIMITT1
TESTIMITT1
TESTIMITT1
TESTIMITT1
TESTIMITT1
TESTIMITT1
TESTIMITT1
TESTIMITT1
TESTIMITT1
Phase Time
Length/ms Peak % rms %
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L1-phase 20.2.2001 19:01:35
200
L2-phase 20.2.2001 19:01:35
190
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L3-phase 20.2.2001 19:01:35
200
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L1-phase 20.2.2001 18:52:46
250
78
L2-phase 20.2.2001 18:52:46
240
71
L3-phase 20.2.2001 18:52:46
260
82
L1-phase 20.2.2001 16:41:10
160
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L2-phase 20.2.2001 16:41:10
170
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L3-phase 20.2.2001 16:41:10
180
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L1-phase 20.2.2001 16:22:53
180
5
L2-phase 20.2.2001 16:22:53
170
4
L3-phase 20.2.2001 16:22:53
190
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9
22
17
5
21
12
14
23
28
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31
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Voltage dips 2(2)
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EQL Software1(3)
• EQL Online
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Local operation
Read and set meter via RS 232C-connection
Meter data to the text file
Voltage interruptions to the log file with the time
stamps
– Voltage dips and rises to the dip file with the time
stamps
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EQL Software 2(3)
• EQL Transmit
– Remote reading and meter database
– Operation via phone and GSM connection
– Automatic reading processing
– Time tariff setting
– Energy metering for de-regulated market (
one hour)
– Quality monitoring
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EQL Software 3(3)
• e-Quality
– Quality monitoring and reporting from EQL Transmit
database
– Viewing data and printing reports
– Management and documenting of quality metering samples.
– Zooming and scrolling graphics view
– Comparison between different meters
– Continuos quality recording and reporting
– Connections to other PQ meters
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EQL customers
• Rovakaira Oy - Finland
– 10 pcs EQL meters in substations
– 2 pcs EQL portable meters
– 240 pcs hourly monitoring meters
• Koillis-Satakunnan Sähkö Oy - Finland
– 8 pcs EQL meters in substations
– 25 pcs EQL meters at customers
• Vatajankosken Sähkö Oy - Finland
– 9 pcs EQL meters in substations
– 70 pcs hourly monitoring meters
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EQL customers
• Fortum Distribution Oy - Finland
– 8 pcs EQL meters in substations
– 40 pcs mobile EQL meters at customers
• Fortum Distribution Ab - Sweden
– 15 pcs mobile EQL meters at customers
• Vattenfall Verkko Oy - Finland
– 12 pcs EQL meters in substations
– 25 pcs mobile EQL meters
• Tampere Energy, Vantaa Energy, EON Finland,
Graninge Kainuu...
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