El Kontrol - Beginning
 
 
Inspection Body

Lead by the pursuit to cover the whole range of electrical engineering services, we acquired the necessary appliances and gathered qualified specialists to form the basis of an Inspection body. It was the first of its kind in Stara Zagora region, certified in 2000 by the Bulgarian Accreditation Service in accordance with BDS EN ISO/IEC 17020:2025 Bulgarian and European standards.


Scope of Accreditation of the Inspection Body:

Range of control Scope of control by parameter
Electrical switchgear and equipments till and over 1000 V • Resistance of protective earthing systems;
• Resistance of protective lightening systems
 
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El Kontrol in Bulgarian Accreditation Service up

Range of control Scope of control by parameter
Electrical switchgear and equipments till and over 1000 V - including primary and secondary circuits • Insulation resistance
 
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El Kontrol in Bulgarian Accreditation Service up

Range of control Scope of control by parameter
Electrical machinery and equipments till 35 kV • Insulation with high voltage with industrial frequency
 
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El Kontrol in Bulgarian Accreditation Service up

Range of control Scope of control by parameter
Electrical switchgear and equipments till and over 1000 V • Impedance of loop "phase-protective earth";
• Residual current devices(RCD): Residual current, time for actuating , contact voltage to equipments protected with RCD, Resistance of earthing to equipments protected with RCD
 
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El Kontrol in Bulgarian Accreditation Service up

Range of control Scope of control by parameter
Protective equipments: Insulating rods for - manipulation, measuring, mobile earthing, insulating pliers, insulating measuring pliers, dielectric mats and carpets • Dielectric strength of insulation by means of HV with industrial frequency
 
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El Kontrol in Bulgarian Accreditation Service up

Range of control Scope of control by parameter
Electrical protective equipments: Voltage indicators • Actueting threshold
 
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El Kontrol in Bulgarian Accreditation Service up

Range of control Scope of control by parameter
Electrical protective equipments: Dielectric gloves, boots, rubbers • Dielectric strength of insulation by means of HV with industrial frequency and leakage current
 
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El Kontrol in Bulgarian Accreditation Service up

Range of control Scope of control by parameter
Cables and cable lines till 20 kV • ielectric strength of insulation by means of high DC voltage
 
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El Kontrol in Bulgarian Accreditation Service up

Range of control Scope of control by parameter
Power transformers with rated voltage till 110 kV • Active resistance of the windings;
• Transformer ratio;
• Connection group
 
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El Kontrol in Bulgarian Accreditation Service up

Range of control Scope of control by parameter
Insulation oil • Breakthrough voltage
 
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El Kontrol in Bulgarian Accreditation Service up

Range of control Scope of control by parameter
Electric AC and DC motors • Active resistance of the windings
 
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El Kontrol in Bulgarian Accreditation Service up

Range of control Scope of control by parameter
Circuit breakers and disconnectors with rated voltage till 400 kV • Transitional resistance of contact system
 
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El Kontrol in Bulgarian Accreditation Service up

Range of control Scope of control by parameter
Protections, electrical automation, telemechanics and secondary circuits • Checking settings of protections for complying with dial;
• Testing operation of the equipment with current and voltage applying
 
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El Kontrol in Bulgarian Accreditation Service up

Range of control Scope of control by parameter
Current measuring transformers with rated voltage till 400 kV • Active resistance of the windings;
• Transformer ratio;
• Magnetization characteristics;
• Polarity of the windings
 
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El Kontrol in Bulgarian Accreditation Service up

Range of control Scope of control by parameter
Voltage measuring transformers with rated voltage till 400 kV • Active resistance of the windings;
• Transformer ratio;
• Polarity of the windings
 
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El Kontrol in Bulgarian Accreditation Service up

Range of control Scope of control by parameter
Vibration • Whole-body vibration measurements;
• Hand-arm vibration measurements;
• Building vibration measurements
 
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El Kontrol in Bulgarian Accreditation Service up

Range of control Scope of control by parameter
Artificial lighting and combined • lighting, Lx
 
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El Kontrol in Bulgarian Accreditation Service up

Range of control Scope of control by parameter
Ventilation instalations • Speed air flow, m/s; flow, m3/h
 
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El Kontrol in Bulgarian Accreditation Service up

Range of control Scope of control by parameter
Microclimate in the work environment • Air temperature, 0С;
• Relative air hymidity, % RH;
• Speed air flow, m/s
 
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El Kontrol in Bulgarian Accreditation Service up

Range of control Scope of control by parameter
Optical cable lines • Total loss;
• Back reflection loss;
• Length of optical cable line;
• Insertion loss
 
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El Kontrol in Bulgarian Accreditation Service up