Intertest Ltd. is an engineering company specializing in substation design, commissioning, and testing. They have extensive experience in medium and high voltage substations. The company has achieved ISO 9001 and OHSAS 18001 certification for their design, engineering, testing, and commissioning services. Intertest has a team of highly skilled professionals and a variety of calibrated equipment to perform their services to high quality standards.

1. Intertest Ltd. is a company created by a team of high-skilled professionals with extensive
experience in Substation design and start-up and commissioning works of projects in the energy
sector.
The company’s focus is the design and commissioning of medium and high voltage substations,
with all their systems and at maximum quality, following customer specifications and best
practices.
We have achieved ISO 9001:2008 and OHSAS 18001 certification from Tuv Rheinland, reinforcing
our strong operational processes and commitment for continual improvement for the following
scope:
“Designing and engineering of electrical switchgears, substations and power plants.
Configuration and testing of relay protections, RTUs and SCADA systems. Electrical installations
and commissioning of projects in the energy sector.”
We have a large variety of high quality calibrated equipment and the necessary software licenses
to provide our services. Because of these favorable reasons, we have established an independent
commissioning body, which is working according to the requirements of EN ISO / IEC 17020. Soon
we will achieve our accreditation from Executive Agency “Bulgarian Accreditation Service”.
ServicesAbout Equipment Projects ContactsCertificates

2. • ISO 9001: 2008 issued by TUV Rheinland – Quality management system is implemented, ensuring quality management of all our
services.
• OHSAS 18001: 2007 issued by TUV Rheinland – Health and safety management system is implemented, contributing the risk
during the performance of our services.
• SIEMENS Power Academy, Vienna – Ivaylo Popov
Compile an addressing concept in accordance with IEC 60870-5
Parameterization of the communication
Test and simulation capabilities with the SICAM TOOLBOX II
Extension and adjustment of the configuration with OPM II and CAEx plus
Practical exercises with the SICAM TOOLBOX II and SICAM AK, SICAM TM, SICAM BC or SICAM EMIC
• Sprecher Automation, Vienna – Ivaylo Popov
Engineering of SPRECON-E-C controllers, including configuration of the hardware, configuration of the communication including
the following standards IEC 60850, IEC 60870-5-101, IEC 60870-5-104, IEC 60870-5-103 and etc. and commissioning.
• Schneider Electric, Sofia, Bulgaria – Borislav Petrushev
Theoretical and practical courses relative to PACiS C264 Technical Training Level 1 and 2
• Paradise Electric Consult, Plovdiv, Bulgaria – Borislav Petrushev
Diagnosis and control of grounding systems
• Sprecher Automation, Linz – Georgi Kyurchenov
Engineering of SPRECON-E-C controllers, including configuration of the hardware, configuration of the communication including
the following standards IEC 60850, IEC 60870-5-101, IEC 60870-5-104, IEC 60870-5-103 and etc. and commissioning.
Engineering and commissioning of HMI system V460.
• Sprecher Automation, Linz – Evgin Halilefendi
Engineering of SPRECON-E-C controllers, including configuration of the hardware, configuration of the communication including
the following standards IEC 60850, IEC 60870-5-101, IEC 60870-5-104, IEC 60870-5-103 and etc. and commissioning.
Engineering and commissioning of HMI system V460.
CERTIFICATES
ServicesAbout Equipment Projects ContactsCertificates

3. COMMISSIONING OF SECONDARY
AND PRIMARY CIRCUITS AND
APPARATUS FOR MV AND HV
CONFIGURATION AND
TESTING OF RTUS AND
HMI / SCADA SYSTEMS
COMMISSIONING OF MEASUREMENT
TRANSFORMERS
COMMISSIONING OF POWER
TRANSFORMERS
CONFIGURATION AND
TESTING OF RELAY
PROTECTIONS
DESIGNING AND ENGINEERING OF
ELECTRICAL SWITCHGEARS,
SUBSTATIONS AND POWER PLANTS
SERVICES
ServicesAbout Equipment Projects ContactsCertificates
COMMISSIONING OF GROUNDING AND
LIGHTNING SYSTEMS
OVERHEAD LINES AND POWER CABLES
TESTING

4. COMMISSIONING OF SECONDARY AND PRIMARY CIRCUITS AND APPARATUS FOR
MV AND HV
<< Return
ServicesAbout Equipment Projects ContactsCertificates
 CURCUIT BREAKERS AND DISCONNECTORS
• Static and dynamic contact resistance
measurement
• Motion analyze
• Minimum Trip Voltage Test
• Timing tests
• Coil and motor current analysis
 ELECTRICAL MOTORS AND GENERATORS
• Insulation resistance
• Absorption of the insulation R60’’/R15’’
R10min/R1min
• Dielectric Discharge test
• Winding resistance
• Resistance of: rheostats and start regulating
resistances

5. COMMISSIONING OF MEASUREMENT TRANSFORMERS
<< Return
ServicesAbout Equipment Projects ContactsCertificates
 CURRECT TRANSFORMERS
• Ratio
• Burden
• Excitation ( Knee point )
• Winding Resistance
• Voltage Withstand Test
• Polarity Check
• Ratio for Rogowski transformers
• Insulation resistance
• Capacitance and power factor
(tgδ)
 VOLTAGE TRANSFORMERS
• Ratio
• Burden
• Voltage Withstand Test
• Polarity Check
• Insulation resistance
• Capacitance and power factor (tgδ)

6. OVERHEAD LINES AND POWER CABLES TESTING
<< Return
ServicesAbout Equipment Projects ContactsCertificates
 LINE PARAMETER MEASUREMENT
• Impedance of power lines and cables
• Line impedance and K-factor
• Mutual coupling factor of parallel lines
 CABLES UP TO AND ABOVE 1000 V
• Insulation resistance
• High voltage tests
• Power factor (tgδ)

7. COMMISSIONING OF GROUNDING AND LIGHTNING SYSTEMS
<< Return
ServicesAbout Equipment Projects ContactsCertificates
 IMPEDANCE
• Impedance of grounding systems
• Impedance of lightning systems
• Contact resistance of the parts in the systems
 STEP AND TOUCH VOLTAGE
 DETERMINATION OF CORROSION OF GROUND
ELECTRODES / GROUNDING MATERIALS

8. COMMISSIONING OF POWER TRANSFORMERS
 POWER TRANSFORMERS
• Ratio
• Winding resistance
• Tap changer test
• Vector group test
• Short circuit impedance
• Capacitance and power factor (tgδ)
• Voltage Withstand Test
• Measurement of no load loss
<< Return
ServicesAbout Equipment Projects ContactsCertificates

9. CONFIGURATION AND TESTING OF RTUs AND HMI / SCADA SYSTEMS
We have a good experience of full scope of engineering of ABB RTU560, SICAM and Sprecher Automation RTUs (remote
terminal units) and HMI systems, including the following characteristics:
 Configuration of RTUs – RTU560, SICAM: AK 1703, TM, MIC and CMIC, SPRECON and etc.
• Local and Remote control function.
• Central annunciation systems.
• Communication to the local Dispatch center over IEC 60870-5-101, IEC 60870-5-104 and etc.. with redundant communication
lines.
• All kind of internal logics and interlockings.
 Configuration of HMI systems – ABB Micro SCADA, SICAM 230, Siemens WinCC, Sprecher Automation V460.
• Automated control and monitoring systems
• Energy management and monitoring systems.
• Remote control functions with different options of software interlockings.
• Communication with redundant servers.
<< Return
ServicesAbout Equipment Projects ContactsCertificates

10. CONFIGURATION AND TESTING OF RELAY PROTECTIONS
Our relay protection engineers have excellent experience with wide range of relay protections as follows:
• ABB – all different series – COMBIFLEX, Relion and etc.
• SIEMENS – all types from SIPROTEC 4 and SIPROTEC 5
• AREVA
• ALSTOM
• Schneider Electric
• VAMP
• Woodward
• Rocon
• EFACEC
They have made configuration and tests according to different requirements and they have elaborated a wide range of solutions,
including:
• Communication configuration according to IEC 61850, IEC 60870-5-103, Modbus and etc.
• GOOSE massages for interlocking functions
• GOOSE massages for blocking functions of different variety of protection functions
• Control functions with interlocking from the local display of the device;
• Time synchronizing over NTP / SNTP server, IRIG-B and etc.
<< Return
ServicesAbout Equipment Projects ContactsCertificates

11. DESIGNING AND ENGINEERING OF ELECTRICAL SWITCHGEARS, SUBSTATIONS AND
POWER PLANTS
 DESIGNING WORKS
• Diagrams of control systems
• Interlocking diagrams
• Relay protections diagrams
• Auxiliary supply systems
• Engineering of Automatic Transfer Switch
• Control and relay panels layouts
• Designing of RTU panels
<< Return
ServicesAbout Equipment Projects ContactsCertificates
 INSTALLATION WORKS
• Manufacturing of relay panels
• Manufacturing of control panels and cubicles
• Manufacturing of auxiliary AC / DC panels
• Installation and panel mounting on site
 ENGINEERING
• Project and recourse planning
• Project management
• Site management
• Factory Acceptance Test
• Site Acceptance Test
• Client Consulting
• Calculation of relay protection settings
• Analysis of electrical networks

12. EQUIPMENT
OMICRON CMC 353
Three current and four voltage sources unit for testing
relay protections.
ServicesAbout Equipment Projects ContactsCertificates
OMICRON CMC 356
Six current and four voltage sources unit for testing relay
protections.
OMICRON CPC 100
Multi-functional primary test system for substation
commissioning and maintenance
OMICRON CIBANO 500
Multi-functional test system for Medium- and High-
voltage circuit breakers

13. EQUIPMENT
ServicesAbout Equipment Projects ContactsCertificates
OMICRON CU 1
Test unit for measuring overhead lines and power cables
OMICRON HGT1
Test unit for measuring step and touch voltages
FLUKE 435
Power Quality and Energy Analyzer

14. MIT515
5 kV Insulation resistance tester
DLRO10HD
10 A Micro ohmmeter.
DET4TC2
Earth Resistance and Soil Resistivity Testers
ServicesAbout Equipment Projects ContactsCertificates
EQUIPMENT
SVERKER 750
One phase unit for testing relay protections.
Programma EGIL
Circuit breaker analyzer

15. CONTACTS
Address: Sofia 1113
str. Joliot-Curie 20
Office 1503
Phone: +359 883 555 287
Email: i.popov@interest.bg
www.intertest.bg
ServicesAbout Equipment Projects ContactsCertificates