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PERTURBATION MEASUREMENTS ON OVERHEAD NETWORKS
USING ELECTRIC FIELD SENSORS
Objective Measuring voltage disturbances referred to industrial frequency value, such as flicker, harmonics, sags
Advantages Access from public areas Practical, low costs and time saving
Applications Detection of disturbing loads Statistical Control of Supply Quality
ISSOURIBEHERE Argentina RIF Session 2 0513
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PERTURBATION MEASUREMENTS ON OVERHEAD NETWORKS
USING ELECTRIC FIELD SENSORS
Measuring an electric field between two
electrodes.
It is similar to a capacitive voltage divider
where the HV capacitor has been replaced by a
parasitic one. Principle used in HV Labs
For measuring perturbations - referred to the
fundamental frequency voltage It is only
necessary to reproduce the waveshape. Due to
this it is not necessary to know the constants
GV, kE, kG, being enough to verify the linearity
and the independence of the frequency.
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PERTURBATION MEASUREMENTS ON OVERHEAD NETWORKS
USING ELECTRIC FIELD SENSORS
Solving equations, the mathematic result is
Testing the circuit, the result is
h seq V3F Vm
2 - 1 1
3 0 2 2.5
4 1 1
5 - 10 10
6 0 1 1.2
One channel EFS measurement reproduces and
sequence but not 0
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PERTURBATION MEASUREMENTS ON OVERHEAD NETWORKS
USING ELECTRIC FIELD SENSORS
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PERTURBATION MEASUREMENTS ON OVERHEAD NETWORKS
USING ELECTRIC FIELD SENSORS
HV Lab experiences and contrast Flicker and
harmonics were applied to a HV installation using
a LV/HV transformer excited with an electronic
power generator. IEC meters were used
Measurement system EFS recording equipment meet
error ? 5 , IEC 61000-4-15 Flicker standard and
Class I IEC 61000-4-7 Harmonics standard.
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PERTURBATION MEASUREMENTS ON OVERHEAD NETWORKS
USING ELECTRIC FIELD SENSORS
Field measurements
Flicker comparison HV with EFS vs LV
conventional
Subtransmission area explored
Flicker in Bragado LV conventional measurements
Flicker HV with EFS vs LV conventional
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PERTURBATION MEASUREMENTS ON OVERHEAD NETWORKS
USING ELECTRIC FIELD SENSORS
Field measurements
Localizing flicker Sources
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PERTURBATION MEASUREMENTS ON OVERHEAD NETWORKS
USING ELECTRIC FIELD SENSORS
Localizing flicker Sources
Summary

• 1.Flicker measurements in overhead lines with the
  EFS are feasible to perform in compliance with
  required uncertainties, according to
  International Standards.
• 2. The following steps shall be carried out to
  find the geographic location of the prevailing
  Flicker source
• Perform measurements with an EFS in different
  nodes of the power system keeping one
  conventional Flicker measurement in a reference
  place .
• Obtain the topology and the electrical data of
  the power system to be inspected, and determine
  (by manual calculations or by computer
  simulations) the effects of a predominant Flicker
  source in different nodes of the power system.
• Correlate both results and determine the
  geographic location of the predominant Flicker
  source.

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PERTURBATION MEASUREMENTS ON OVERHEAD NETWORKS
USING ELECTRIC FIELD SENSORS
Harmonic measurements
Results obtained with the same EFS, during
flicker measurements
Saladillo node was over the 5th harmonic
limit Chacabuco node should be checked longer The
other nodes are within the limits The results for
the 3rd harmonic and its multiples should be
considered only as indicative
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PERTURBATION MEASUREMENTS ON OVERHEAD NETWORKS
USING ELECTRIC FIELD SENSORS
Remarks

• It is a practical way to measure harmonics,
  flicker and other perturbations related to
  industrial frequency voltage, in compliance with
  IEC rules under 1F/3F grids (,- seq, not 0)
• It can be used as a powerful tool for finding
  disturbing loads along aerial transmission /
  distribution grids by accessing from public areas
• It is a useful tool for statistical inspection of
  PQ in widespread electrical systems
• The EFS based measurement method is particularly
  useful where both cost and physical location
  drawbacks cannot be addressed

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PERTURBATION MEASUREMENTS ON OVERHEAD NETWORKS
USING ELECTRIC FIELD SENSORS
References
1 M.Del Pozo, D.Esteban, P.Issouribehere,
G.Barbera (IITREE FI-UNLP) A. Funes, A. Ledezma
(YACYLEC), 2010, "Field measurements and
modelling of high frequency transients during
disconnect switch operations in EHV Substations.
Assessment of their effects on Current
Transformers", International Congress of CIGRE
(Conseil International des Grands Réseaux
Electriques). Paper A3_207_2010. Paris, France,
Ag. 2010. 2 G. Casas, P. Issouribehere
Aplicación de un medidor de campo eléctrico como
transductor para mediciones de perturbaciones en
redes. II ERLAC CIGRE CE 36. Puerto Iguazú,
Argentina, junio 1987. 3 ENRE (Argentina)
Resoluciones 184/00 Base Metodológica para el
Control de la Calidad del Producto Técnico. Etapa
2 y ENRE 99/97 Base Metodológica para el
Control de la Emisión de Perturbaciones. Producto
Técnico - Etapa 2 . IEC EMC Standards
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PERTURBATION MEASUREMENTS ON OVERHEAD NETWORKS
USING ELECTRIC FIELD SENSORS
Daniel Esteban, Fernando Issouribehere, Pedro
Issouribehere
Instituto de Investigaciones Tecnológicas para
Redes y Equipos Eléctricos IITREE-LAT)FACULTAD
DE INGENIERÍA - UNIVERSIDAD NACIONAL DE LA PLATA
- ARGENTINA www.iitree-unlp.org.ar
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