Profotech is a Russian integrated company specializing in optical fiber and fiber-optic instrument transformers, with production and research facilities located in Moscow. The company offers a comprehensive manufacturing cycle for these products, certified to ISO:9001, and emphasizes high accuracy, safety, and modern digital interfaces in its technologies. Their optical transformers are used in applications like digital substations, energy metering, and relay protection, facilitating advancements in smart grid systems.

1. PROFOTECH.
Optical instrument transformers.
109316, Russia, Moscow, Volgogradsky prospect
Tehnopolis «Moscow»
Tel/fax: + 7 (495) 775 83 39
info@profotech.ru
www.profotech.ru
1

2.  Profotech is a Russian integrated company, having its own proprietary technology of a special optical
fiber and fiber-optic instrument transformers.
 Shareholders: Rosnano (www.rusnano.com) and Onexim Group (www.onexim.ru).
 Production area and office of the company are located in Moscow at the territory of the Technopolis
“Moscow”. The R&D center is located at the Institute of Radio-engineering and Electronics of Russian
Academy of Science.
 The personnel of the company consists of high-professional specialists, engineers and scientists.
Technopolis “Moscow”
About Company.
Fryazino branch of the Kotelnikov Institute of Radio-engineering and
Electronics of the Russian Academy of Science

3. 3
Profotech has organized the complete cycle of the products manufacturing – from the optical fibers
production to the output high-voltage tests of the end product.
Manufacturing is certified on correspondence to ISO:9001
 Research and Development;
 Manufacturing of special optical fibers;
 Assembling of products;
 Temperature tests of assembly units and
devices;
 Metrological and high-voltage tests;
 Warranty and post-warranty
maintenance.
Manufacturing and service capabilities.

4. 4
Capabilities:
Tests of the current and voltage transformers, Mus, digital power and quality meters with the analog
and digital (IEC 61850-9-2LE SV80/SV256) outputs with the accuracy classes of up to 0,05;
Tests of the voltage transformers of the levels of up to 220kV with the accuracy class of up to 0.1;
Tests of the current transformers with the accuracy class of up to 0.05, rated current up to 30kA AC
and 680kA DC (for flexible current transformers);
Tests of the electronic current and voltage transformers, MUs and relay protection devices, operating
under IEC 61850-9-2LE protocol with the registry of the oscillographs by the digital (SV80, SV256, etc.)
and analog outputs;
Tests of the VT, CT and MUs for frequency range 20..10000Hz and harmonics reproduction up to 50th
Environmental tests of the current and voltage transformers, and other devices by the continuous
cycle. Reproduced conditions: Temperature range -70 to +90 degC / Humidity 98% at 35-55 degC.
Dimensions of operation capacity of a chamber 0.7х0.7х3.2m
Transient response tests of VTs and CTs
Test center of Profotech.

5. 5
 High fire and explosion safety;
 High seismic safety (9 points by MSK-64 scale);
 Optical methods of current parameters measuring;
 Complete galvanic isolation, correspondence to modern Electromagnetic
Compatibility requirements;
 Digital signal processing and modern interfaces (correspondence to IEC61850);
 Operation safety increase for service staff;
 Lack of high potentials appearance at secondary circuits interruption leads to
secondary equipment’s operational safety increase;
 Expenses reduction for current operation, risks absence of interruption of the
electric supply to the consumers;
 High measurements accuracy (are included in the Russian State Register of
Measuring Instruments);
Modern (innovative) optical technologies.
Modern electronic optical current and voltage transformers Profotech ensures:

6. 6
Two light waves with the orthogonal circular polarization are
fed into the multi-turn loop of a special optic fiber; there is a
current-carrying conductor inside the loop. If no current is fed
to into the loop, the light waves propagate in the fiber loop at
equal speeds and come to the loop output simultaneously. If
the current is fed to the conductor – the optic fiber appears in
the magnetic field of the carried current. During this process,
the optical properties of the fiber change, and the speed of the
light wave propagation along the loop becomes different; a
relative phase displacement occurs between the waves at the
loop output. Thus, the measurement of the current by the
fiber-optic method comes down to an accurate measurement
of the relative phase displacement between the light waves in
the sensitive fiber loop placed in the linear magnetic field of
electric current.
Current measurement principle.
B – magnetic induction vector
Е – electric-field vector of light
Current measurement principal is based on Faraday effect.

7. Light source
Fiber-optical circulator
Polarizer
Birefringence modulator
Polarization
transformer Magneto-sensitive fiber
Mirror
Conductor busPhotoreceiver
Electronic processing unit Fiber-optical
cable
Measuring element
Electronic processing
unit
..0111011
00001101
0...
Up to 1200
m
61850
7
Schematic diagram of optical current transformer.

8. Insulating
column
Optical fiber #2 – for relay protection
Optical fiber #1 – for revenue metering
Electronic units
(1 unit for three phases)
8
Base
Electronic fiber optic current transformer EFOCT.
EFOCT design in mounting performance
Optical fiber #3 – for redundancy relay protection (optionally)
Conductor bus
Fiber-optic sensor
Special optical fiber

9. 9
EFOCT basic characteristics.
Parameter Value
Rated voltage, kV 0 – 750
Rated primary current, A 100 – 3 000
Accuracy class
– for measurements
– for protection
0.2S/2; 0.2S; 0.5S
5TPE, 5Р
Range of operating temperatures, °С
– measuring sensor
– electronic unit
minus 60 – plus 60
minus 10 – plus 40
Rated short-time thermal current
Rated dynamic current
63 kA @ 1s
190 kA
Rated frequency 50 or 60 Hz
Expanded frequency band 20 to 5000 Hz
Distance between sensor and electronic unit, m up to 1200
Power consumption, W 50
OUTPUT SPECIFICATIONS
DIGITAL Standard
IEC 61850-9-2LE SV80; SV256
IEC 61850-9-2
IEC 61850-8-1
Sample rate SV80; SV256; custom – up to 64kps
TIME
IEEE 1588-2008 (PTPv2);
1PPS optical, electrical
Redundancy PRP; HSR
Analog (optional) Current 1A 10 VA

10. Voltage measurement principle.
The voltage is measured by means of a capacitance divider without
inductive part. The measuring signal is taken from the low section of
the voltage capacitance divider. The power supply to the optical
electronic sensor is provided via optic fiber using a specific laser
source of high reliability. The data of the measured voltage values in
the digital form are transmitted to the electronic processing block via
standard optic fiber. Thus, an absolute galvanic insulation of the
primary and secondary circuits is achieved.
10

11. Schematic diagram of electro-optical voltage transformer
High-voltage lead
Light source
Photothyristor power
supply unit
Electronic processing unit Fiber-optical cable Voltage measuring element
Light source AD converterElectronic processing
unit
..01110
110000
11010...
61850
Up to
1200 m
11

12. Insulating column with capacitance divider
Base with AD converter and fiber optic interface
Fiber optic cable
Design of electro-optical voltage transformer.
Electronic unit
(1 unit for three phases)
12
Capacitive electronic voltage divider (EVTCD).

13. Parameter Value
Rated voltage, kV 110; 123; 220
Accuracy class
– for measurements
– for protection
0.2
3Р
Range of operating temperatures, °С
– measuring sensor
– electronic unit
minus 60 – plus 60
minus 10 – plus 40
Rated frequency 50 or 60 Hz
Expanded frequency band 20 to 5000 Hz
Distance between sensor and electronic unit, m up to 1200
Power consumption, W 50
OUTPUT SPECIFICATIONS
DIGITAL Standard
IEC 61850-9-2LE SV80; SV256
IEC 61850-9-2
IEC 61850-8-1
Sample rate SV80; SV256; custom – up to 64kps
TIME
IEEE 1588-2008 (PTPv2);
1PPS optical, electrical
Redundancy PRP; HSR
Analog (optional) Voltage 100/√3V 10VA
EVTCD basic characteristics.
13

14. 14
Electronic fiber optic current transformer with flexible sensitive element
Flexible EFOCT design.
For AC (three-phase set)
Fiber-optic sensors Electronic unit
(1 unit for 3 phases)
Generator
leads
Fiber optic cable
For DC (1-3 sensors set)
Busbar
Fiber-optic sensor
Fiber optic cable
Electronic unit

15. Basic characteristics of EFOCT for AC.
15
Parameter Value
Rated voltage, kV 0 – 750
Rated primary current, A 300 – 190 000
Accuracy class
– for measurements
– for protection
0.05; 0.2S/2; 0.1; 0.2S; 0.5S
5TPE, 5Р
Range of operating temperatures, °С
– measuring sensor
– electronic unit
minus 60 – plus 60
minus 10 – plus 40
Rated short-time thermal current
Rated dynamic current
any
Rated frequency From 0 to 2500 Hz
Distance between sensor and electronic unit, m up to 1200
Power consumption, W 50
OUTPUT SPECIFICATIONS
DIGITAL Standard
IEC 61850-9-2LE SV80; SV256
IEC 61850-9-2
IEC 61850-8-1
Sample rate SV80; SV256; custom – up to 64kps
TIME
IEEE 1588-2008 (PTPv2);
1PPS optical, electrical
Redundancy PRP; HSR
Analog (optional) Current 1A 10 VA

16. Basic characteristics of EFOCT for DC.
Parameter Value
Rated current, A 600-580 000
Basic reduced measuring uncertainties 0.05; 0.1; 0.2; 0.5; 1.0
Distance between sensitive fiber-optical element and electro-optical
transform module, m Up to 1200
Possible switching interfaces
Pulse output
Frequency output
Analog Current output
Analog voltage output
Modbus RS-485
ProfiBus
IEC 61850-9-2
Range of operating temperatures:
– measuring sensor
– electronic unit
from -10 to +40
from -60 to +60
Average lifetime, years, at least 30 years
Power consumption, W 50
16

17. Combined fiber optical current and electronic voltage transformer.
17
NEW products.
Basement with AD
converter and fiber-optical
interface
Conductor bus
Fiber-optic sensor
Insulating column with capacitive divider
Electronic unit for current
Electronic unit for voltage
Optical cable

18. Parameter Value
Rated voltage, kV 110 ; 123
Rated primary current, A 100 – 3 000
Accuracy class
– for measurements
– for protection
0.2S/2; 0.2S (for current), 0.1; 0.2 (for voltage)
5TPE, 5Р (for current); 3P (for voltage)
Range of operating temperatures, °С
– measuring sensor
– electronic unit
minus 60 – plus 60
minus 10 – plus 40
Nominal load (analog output, per phase), VA:
- for measurements
up to 5
Distance between sensor and electronic unit, m up to 1200
Power consumption, W 100
OUTPUT SPECIFICATIONS
DIGITAL Standard
IEC 61850-9-2LE SV80; SV256
IEC 61850-9-2
IEC 61850-8-1
Sample rate SV80; SV256; custom – up to 64kps
TIME
IEEE 1588-2008 (PTPv2);
1PPS optical, electrical
Redundancy PRP; HSR
Analog (optional) Voltage 100/√3V 10VA
Current 1A 10 VA
Basic characteristics of combined transformer.
18

19. 19
Mobile measurement system for verification and calibration of CT with analog and
digital (61850-9-2 LE) outputs
Application area:
verification and calibration of the current transformers, applied
for revenue metering of electric energy with analog and digital
(61850-9-2 LE) outputs.
AC rated current range 0.6 – 190 kA
DC rated current range 1 – 600 kA
Accuracy class 0.05 or 0.1;
Operating temperature range -20 .. + 60 degC (0.05%)
-60.. +60 degC (0.1%)
Design:
Optic electronic module with analog and digital interfaces;
Fiber-optical cable with special fiber
Automated workplace;
NEW products.

20. Application Areas of optical transformers.
20
Electric energy transmission
and distribution
Generation HVDC lines Power-consuming industry
Application − Digital substation technology
− Revenue metering and measurement of electric
energy quality parameters;
− Relay protection and automation;
− Revenue metering of
electric energy;
− Relay protection and
automation;
− Revenue metering and
measurement of
electric energy quality
parameters;
− Measurement of high,
extra-high and pulse
currents;
Products Optical current and voltage
transformers (EFOCT, EVTCD,
EFOCT-F)
Flexible optical measurement
current transformer (EFOCT-F)
Optical transformer for direct
current measurement (EFOCT-
F)
Flexible optical transformer
for direct current
measurement (EFOCT-F-DC)

21. Relay protection and automation
Highest accuracy of the time-current curve, even in case of aperiodic component availability
due to the absence of saturation;
Wide dynamic range;
Highest speed of measuring signal conversion.
21
Solutions on the basis of optical transformers.

22. In present, the technical solutions which ensure the selective detection of the
short-circuits at the cable sections of the aerial cable lines are absent, and thus
the significant problems with auto reclose blocking of power lines systems
implementation appears. This makes the risk of expensive high-voltage
substations damage.
Solution: Flexible fiber-optical current transformer of Profotech is wound around
the base of high-voltage cable joint that allows to build up a high-accuracy
current measurement point. The digital protection terminal is connected to the
fiber-optical transformer and implements necessary protections operation
algorithms. The application of IEC 61850-9-2LE data transmission protocol in
case of fiber-optical transformers and protection terminal joint operation
ensures the unique accuracy and increased operation speed of relay protection
system.
The solution is carried out without disassembling and long-term
withdrawal from operation of already installed equipment.
22
Complex protection of cable and aerial cable lines 110-220kV.
Solutions on the basis of optical transformers.

23. Digital substation:
Optical transformers are the basis for digital substation measurements.
23
Solutions on the basis of optical transformers.

24. Digital substation as an element of smart grid.
 Standardization and unification of
engineering processes at substation on
the basis of the set of IEC 61850
international standards.
 Transferring from the transmission by the
analog and discrete circuits to the digital
information transfer.
 Development of consolidated
information area of substations and
control centers.
24
Construction philosophy

25. 25
RUSAL- Bratsk
RUSHYDRO
Solution: Process control system, energy metering.
Solution: generators digital protection
Installations

26. 26
RUSAL Irkutsk
Solution: electric power fiscal metering
system
Solution: Process control system, energy
metering.
Installations.
Grid Company, Tatarstan, Russia

27. 27
Federal Grid Company, Moscow
GAZPROM - Mosenergo
Solution: digital substation (metering,
protection)
Solution: electric power fiscal metering
system
Installations.

28. 28
RUSAL – Krasnoyarsk, RUSAL – Sayanogorsk.
Solution: Process control system,
energy metering.
Installations.
Federal Agency on Technical Regulating and Metrology.
Solution: Precision high current
metering metering.

29. 29
109316, Russia, Moscow, Volgogradsky prospect, 42/5
Tehnopolis «Moscow»
Tel/fax: + 7 (495) 775 83 39
info@profotech.ru
www.profotech.ru