Fiber Optics Current Sensor – Free Standing

Fiber Optics Current Sensor – Free StandingEnabling smart grids and digital substations

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Month DD, Year | Slide 2© ABB Group

ABB – Global Technology Leader

ABB HV Products Portfolio – Instrument Transformers

ABB HV Products Portfolio – Current Transformers

Fiber Optics Current Sensor – Free Standing

Enabling digital substations and smart grids

Product overview

Customer benefits

Design details

Ratings and technical details

System architectures variants

Applicable Standards

Summary

ABB

ABB is a global leader in power and automation technologies that enable utility and industry customers to improve performance while lowering environmental impact.

The ABB Group of companies operate in around 100 countries.

A global technology leader


ABB PPHV product portfolio

ABB has been producing instrument transformers for more than 70 years.

The main tasks of instrument transformers are:

To transform currents or voltages from a usually high value to a value easy to handle for relays and instruments.

To insulate the metering circuit from the primary high voltage system.

To provide possibilities of standardizing the instruments and relays to a few rated currents and voltages.

ABB offers:

Current Transformers

Voltage Transformers

Combined Current/Voltage Transformers

Station Service Voltage Transformers

All instrument transformers supplied by ABB are tailormade to meet the needs of our customers.

Instrument transformers


ABB PPHV product portfolio

Conventional current transformers use the principle of electro-magnetic induction to generate a small secondary current, typically 1 A or 5 A at rated primary current, which then serves as an input for protection relays or energy meters.

ABB offers inductive current transformers for rated systems up to 800 kV, both:

Oil insulated

SF6 insulated

ABB has also developed since 1990s optical current sensors, based on the Faraday effect principle, whereby light is used to deduce the precise magnitude of current that is creating the magnetic field.

The latest generation of fiber optic current sensors has been adopted in the free-standing application, to cover the demand for non-conventional current transformers having digital output and suitable for current measurement applications in 245 kV to 800 kV substations.

Current transformers



ABB’s newly developed product family of Fiber Optics Current Sensor- Free Standing (FOCS-FS) offers significant improvements over conventional CTs and facilitates direct introduction of digital process bus in HV substations.

This new design exceeds magnetic CT technology in:

safety of operation

current measurement and frequency response

footprint/weight savings

environmental friendliness.

The fast response of FOCS and precise measurement of both ac and transient dc results in improved substation protection and monitoring functions.

The digital interface of FOCS-FS is designed for IEC 61850-9-2LE communication for integration into digital substation automation systems.

Enabling digital substations and smart grids



FOCS-FS is a free-standing 3-phase sensor system for 245 kV to 800 kV high voltage substations

One system consists in:

#3 HV columns, each one provided with one sensor head (SH), which contains two fiber coils in order to enable redundancy on the system level

#1 outdoor kiosk equipped, for a redundant solution, with twoopto-electronic (OE) modules

Any opto-electronic module performs the following tasks:

sends polarized light to the sensor

receives the reflecting polarized light from the sensor

compares in close-loop control the phase displacement in the polarized light in proportion to the magnetic field and the primary current

converts the result into an optical IEC 61850 Ethernet output.

Product overview



Enabling smart grids and digital substations: Digital interface, designed for IEC 61850-9-2LE communication for integration into digital substation automation systems.

“Plug & Play” solution: Fully redundant system with “hot swappable” opto-electronics.

Accurate: Meets key modern performance requirements for accuracy, in a wide temperature range. The design is inherently free of magnetic saturation, therefore suitable for capturing fast transient currents, short circuit currents, and alternating current (AC) with DC-offset.

Reduced substation footprint: The compact design requires less space compared to traditional instrument transformers.

Eco-efficient: Using no oil or SF6 gas FOCS is an eco-efficient solution.

Reliable: Simple and robust design with self-diagnosis and alarm functions; different levels of redundancy available on request.

Customer benefits 1/2



Safe: As providing a low voltage digital output and filled with nitrogen gas at ambient pressure, FOCS has zero risk of electrocution and explosion.

Compatible: Suitable for conventional Air Insulated Substation layouts. The adopted IEC61850-9-2LE protocol allows interoperability with other vendors’ equipment.

Simplified engineering: Rated voltage and rated current are the only parameters that need to be specified. As a result, projects have simplified system engineering and are delivered faster. Additionally, the impact of late changes in specifications is negligible.

Easy to install: FOCS is light-weight, compact and flexible with reduced installation costs. Deployment of fiber cables in the substation does not require splicing with dedicated fiber-optic equipment. The outdoor placement of the opto-electronics modules near the insulators reduces the length of sensor fiber cables to a minimum.

Customer benefits 2/2



Head: The same aluminum casting design covers all voltage ratings and all currents ratings. The design allows the installation of a second optical sensor head, in order to have an extended redundancy level for the system.

Primary terminals: Interchangeable, as per customer specifications and applicable Standards. Possibility to have contactless application (no HV primary terminals). Contacts are aluminum cased and present two passthrough holes that allow periodical calibration (if requested) without necessity to disconnect the main contacts.

Insulator: The design is based on hollow insulator technology. The whole product family utilizes the insulators of the same diameter.

Basement: An aluminum casting basement is designed for the whole family products (245-800 kV). Optical fibers are winded and segregated in the basement during transport and erection.

Design details


Fiber Optics Current Sensor – Free StandingRatings and technical details 1/2


Parameters [unit] FOCS-FS 245 FOCS-FS 420 FOCS-FS 550 FOCS-FS 800

Rated frequency [Hz]Highest voltage for equipment [kVr.m.s.] 245 420 550 800Rated power-frequency withstand voltage [60 s] [kVr.m.s.] 460 630 680 975Rated lightning impulse withstand voltage [1,2/50 µs] [kVpeak] 1050 1425 1550 2100Rated switching impulse withstand voltage [250/2500 µs] [kVpeak] N/A 1050 1175 1550

Rated primary current [A]Max continuous thermal current [A]

Rated short circuit current (1 s / 3 s) [kA]

Rated dynamic current [kA]

Material - Color N/AMin nominal specific creepage distance(as per IEC61869-1 table 6)

mm/kV

Min flashover distance mm 2040 3580 4390 6440

Static withstand loads N Class II: 4000 Class II: 5000 Class II: 5000 as per customer specifications

Insulation fluid N/AFilling absolute pressure MPa

Protection accuracy N/A

Digital output N/A

IEC Class 5P, 5TPEIEEE 10%

InterfacesDigital output (IEC 61850 9-2 LE)

Optical ethernet cable: Duplex MM 62.5/125 with ST connectorOptical 1PPS cable: Duplex (or Simplex) MM 62.5/125 with ST connector

System Voltage

Current ratings

Insulator

Accuracy

2000 ÷ 4000

50 / 60

N2

63 / 40

164

≈ ambient pressure

composite - grey31

(Pollution level 4 - Very Heavy)

4800

Fiber Optics Current Sensor – Free StandingRatings and technical details 2/2


Parameters [unit] FOCS-FS 245 FOCS-FS 420 FOCS-FS 550 FOCS-FS 800

Redundancy of electronics N/AMerging unit for VT signals N/ARedundancy of power supply N/A

Outdoor equipment operating temperature (shade) [°C]Relative humidity %Altitude above sea level [m]Air pollution [IEC 60815] N/A

Corrosive environment [ISO 12944-2] N/A

Solar radiation [W/m 2̂]Ice load mmSeismic level gControl cabinet degree of protection [IEC 60529] N/A

HV Column height (one phase) [mm] 2716 4256 5066 7116HV Column net weight (one phase) [kg] 172 240 276 363HV Column shipping weight (three phases in one box) [kg] 766 1097 1268 1689HV Column shipping dimensions (three phases in one box) [mm] 1200 x 3100 x 1200 1200 x 4600 x 1200 1200 x 5500 x 1200 1200 x 7500 x 1200HV Column fixing points on pedestal N/A

Control Cabinet dimensions (width x height x depth) [mm]

Control Cabinet net weight [kg]

Control Cabinet shipping dimensions [mm]

Control Cabinet shipping weight [kg]

Available on request

120 (non redundant opto-electronics with merging unit)150 (redundant opto-electronics with merging units)

Available on request

OptionsAvailable on request

Dimensions and weights

800 x 1000 x 300 (non redundant system)1000 x 1200 x 300 (redundant system)

0,5

Environmental conditions[-40; +45]

C3 ÷ C5 (Medium ÷ Very high)

1200 x 1400 x 650 (non redundant system)1000 x 1200 x 300 (redundant system)

165 (non redundant opto-electronics with merging unit)210 (redundant opto-electronics with merging units)

≤1000100

≤1000

IP 65

20

#4 holes ø22 at 480 x 480 mm

Very Heavy


The level of redundancy that can be specified is given by the number of opto-electronics units integrated in the system.

Typically protection applications require a “single redundant” configuration, which consists of two opto-electronic units operating independently and in parallel.

Other redundancy levels, for example “non redundant” (one opto-electronic unit) and “double redundant” (four opto-electronic units) are available.

All solutions can be equipped on request with SAM600 standalone merging units, which digitalize analog signals coming from voltage transformers, synchronize those signals with the digital signal coming from FOCS and consolidate both signals into a digital output stream complying with IEC61850-9-2 LE protocol.

System architecture variants



The level of redundancy that can be specified is given by the number of opto-electronics units integrated in the system.

Typically protection applications require a “single redundant” configuration, which consists of two opto-electronic units operating independently and in parallel.

Other redundancy levels, for example “non redundant” (one opto-electronic unit) and “double redundant” (four opto-electronic units) are available.

All solutions can be equipped on request with SAM600 standalone merging units, which digitalize analog signals coming from voltage transformers, synchronize those signals with the digital signal coming from FOCS and consolidate both signals into a digital output stream complying with IEC61850-9-2 LE protocol.

System architecture variants 1/2


Fiber Optics Current Sensor – Free StandingSystem architecture variants 2/2


Fiber Optics Current Sensor – Free StandingApplicable standards


FOCS-FS current transformers are designed to comply with the following Standards:Standard Date Description

IEC 60044-8 (2002-07) Electronic current transformers

IEC 61869-1 (2007-10) Instrument transformer – General requirements

IEC 61869-2 (2012-09) Instrument transformer – Additional requirements for current transformers

IEC 61462 (2007-02) Composite hollow insulators

IEC 61850-9-2 (2011-09) Communication networks and systems for power utility automation

IEEE C57.13 (1993) Standard Requirements for Instrument Transformers

IEEE C57.13.6 (2005) Standard for High-Accuracy Instrument Transformers

Standard Date Description

ISO 9001 (2008) Quality Management Systems

ISO 14001 (2004) Environment Management Systems

OSHAS 18001 (2007) Occupational Health and Safety Management Systems

FOCS-FS current transformers are manufactured in ABB’s state-of-the-art facility located in Lodi (Italy). The facility is certified in accordance with the following Standards.

Fiber Optics Current Sensor – Free StandingSummary


ABB’s newly developed family of FOCS provides high voltage substations with improved protection and monitoring functions which deliver accurate and reliable digital signal outputs

Fiber Optics Current Sensor – Free Standing

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