Electrical laboratory KBT carries out enter control of the raw materials, tests of the finished goods.

KBT laboratory was created in the KBT factory for the purpose to carry out research and development studies, to solve the problems of keeping the quality of products of the "KBT" trade mark goods. The laboratory is equipped with all the necessary devices and machines for testing.  


The «КВТ» Laboratory is given the permission of the Rostechnadzor to carry out a great deal of tests and measurements. It is registered by the Office of the Federal service for environmental, technological and nuclear supervision. The Lab personnel annually pass certification in Rostechnadzor. .


Expert evaluation

Tests of the KBT heat shrinkable kits in the laboratory of ZAO FPK «Kalugaenergoremont».

The KBT laboratory cooperates with accredited research centers and laboratories on certification of the goods and research of new developments. The results of the tests held by the KBT laboratory have been confirmed by independent tests of the Russian Research Institute of the Cable Industry (VNIIKP), test center of high-voltage electrical equipment (FGUP VEI ) and independent stationary electrotechnical laboratory(ZAO FPK «Kalugaenergoremont»).

Every year the experimental and testing base of the KBT laboratory is replaced by the new devices and machines that allow carrying out deep research work and applying fundamental and innovative quality control technologies.

High voltage loading equipment

Rated power consumption, kVA 4
Rated output current, A 2000
Maximum output current, A 6000
Operating mode at rated current Long term
Operating mode at maximum current re-short-term

Climatic chamber

Temperature control range, °С from -70 to +150
Control range of relative humidity, %
from 15 to 98
Dimensions of the internal space of the chamber, сm 60 × 80 × 85
The volume of the internal space, dm3 408
Ability to set constant and cyclic test modes
Colour touch screen +
Ability to connect to a computer +

Salt fog chamber

The range of constant temperature, °С 25 - 35
Dimensions of the internal space, сm 90 × 60 × 50
The volume of the internal space, dm3 270
Accuracy of the temperature maintenance, °С ±1
Ability to set constant and cyclic modes of spraying of a salt solution

High voltage test machine SKAT-70

Range of variation of the output test AC voltage, kV
0 - 51
Range of output DC voltage test, kV
0 - 71
Maximum current of the test voltage circuit in the measurement mode, mA
Current protection operation in the measurement mode, mA
Test output rise voltages Manual and automatic
Rate of rise of the output test voltage, kV / sec 1; 2,5; 5; 10

Hardness tester №1

Range of applied loads, kg 1; 5; 10; 20; 30; 50
The range of measurement of hardness in Vickers scale, HV
5,0 - 2900

Hardness tester №2 (HBRVU-187,5)

The range of measurement of hardness the Rockwell scale




The range of measurement of hardness the Brinell scale 3-650HBW
при нагрузках
from 30 kg to 187,5 kg
The range of measurement of hardness Vickers ' scale 15-3000HV at load 30 and 100 kg

Hardness tester №3 (Temp-4)

The range of measurement of hardness the Rockwell scale, HRC
22 - 68
The range of measurement of hardness the Brinell scale HB
95 - 460
The range of measurement of hardness Vickers scale, HV
95 - 950
The limits of measurement of hardness the scale of shore, HSD
23 - 99


Range of measured resistance, MCOM
1,0 - 1999
Permissible basic error, %
Continuous operation time, hour 8
Measurement time, sec 10


The range of measured resistance, μω 102 - 1013
Voltage value at measurement, V 10; 100
Three-electrode measurement scheme +
Equipment of the measuring chamber +


Insulation resistance measurement range, Ohm 104 - 9,99 · 109
The measured AC voltage frequency of 50 Hz, V 40-400
Values of test voltages, V 500; 1000; 2500
The device measures the absorption coefficient +

Tensile strength test machine №1

tensile and compressive forces, N 60 - 30000
Speed control range tear/compression, mm / min
1 - 100
Number of measured parameters 12

Tensile strength test machine №2

tensile and compressive forces, N 4 - 2000
Speed control range tear/compression, mm / min
1 - 100
Number of measured parameters 12

The RLC meter

Resistance measurement range, Ohm 10-3 - 107
Measuring range of inductance, GN 10-5 - 2 ·104
The range of capacitance, f 10-12 - 2 ·10-4
Measuring range of dielectric loss angle tangent Not less 0,001
Ability to connect to a computer +
Two-electrode measurement scheme +

Combustion chamber

sizes, m 0,8 × 0,8 × 1,7
Number of windows 2
Exhaust ventilation and isolation the internal space +

All raw materials and spare parts purchased from suppliers are subject to quality control to meet the requirements and determine the possibility of using them in the KBT production.

Raw material hardness enter control

The test of mechanical properties of metals and alloys is necessary for the correct setting of heat treatment modes of the raw material in the production of the cable terminals, lugs and connectors, tool production, as well as for the control of the ready done goods with the specified requirements..

Measurement of the electrical strength of the raw material

Both raw materials and ready done items are subjected to electrical strength measurements. Measurements are carried out at alternating voltage. At the point of breakdown, the thickness of the test material is measured and its electrical strength is calculated.

Checking the categories of the flammability of the raw materials

Categories of the flammability of the materials are determined in accordance with GOST 28779-90 and are taken into account in the design of heat-shrinkable kits that are flame retardant, heat-shrinkable tubes, insulating shells and polymeric materials used in the production of the electro technical goods. The ready done items are also subjected to the relevant inspection and tests.

The definition of the tracking properties of the raw materials

The use of the materials in the cable heat shrinkable terminals, which are resistant to the formation of conductive bridges, permits a reliable operation of the heat shrinkable kits at high humidity under pollution conditions. This property of materials is called tracking resistance and is determined in the KBT laboratory with the help of a special equipment. The unit creates a test voltage in the range from 0 to 6000 V. the class of tracking resistance of the materials is determined in accordance with GOST 27474-87.

Electrical resistance of the materials

Samples of the electrical insulation material are produced in our factory. After the measurements, the specific surface and volume resistances of the materials are calculated. Dielectric properties of the materials are taken into account in the design of cable fittings, as well as in the input control of incoming raw materials and the production of the ready done goods.

Measurement of the dielectric permittivity of the materials

Materials with a given value of permittivity can reduce the electric field intensity in the most critical areas of heat shrinkable cable kits. Thanks to the use of these materials, our heat-shrinkable products are reliable and have a long service life.

Studies of the composite materials

The KBT laboratory monitors scientific and technical innovations in the field of the composite materials, conducts research and incoming control of the raw materials. According to the results of the research, a decision is made to use the raw materials in the production of the new items.

In accordance to the standard of the KBT factory "Testing and approval of the goods" in the laboratory, in the prescribed time, the quality of the ready done goods monitored, as well as standard and research tests are carried out.


Measurement of resistance of contact joints

Measurements are held by a high-precision digital micro ohmmeter, ohmmeter MCI-200. The values of the contact resistance are measured during the tests of the contact joints during the development of the design of the lugs and connectors, crimping tools, as well as during the approval tests of the ready done goods.

Climate tests

To evaluate the performance of goods in different climatic conditions of operation in the laboratory there are a series of climatic tests conducted. They are performed in a climatic chamber, which allows creating real operating conditions: the temperature range from minus 70°C to plus 150°C at a relative humidity of 20 to 98%. The chamber has input devices used for testing contact connections under electrical load. All climatic tests are carried out in accordance with GOST 16962.1-89 and GOST 20.57.406-81.

Heating by nominal current

The nominal current in the electric circuit under study is created by means of a loading device; its value is controlled by current ticks. The temperature of the contact connections is measured by thermocouples and reflected on the display of the temperature meters. The contact connection does not meet the requirements of GOST 10434-82 (paragraph 2.2.4.) in case of exceeding the set temperature according to GOST. Tests are carried out in the development of new designs of lugs, connectors, clamps and terminals, as well as the approval and standard tests of already produced goods.

Tests of conductive lubricants

The conductive lubricant (means of stabilizing the electrical resistance) is tested by a complex method. This determines the temperature at which the lubricant begins to flow. Contact compounds with applied lubricant are kept in the salt fog chamber for 2 days with periodic spraying of salt solution, and then cyclic heating-cooling tests are carried out. After 500 heating cycles to 120°C, the contact connections are also cycled (50 cycles) to 200°C (copper to 300°C). Resistance of contact joints is measured and the effectiveness of the lubricant is evaluated.

Impact of the axial load

The mechanical strength of the connection of power cable lugs and terminals, rebar elements of ABC items, cable clamps, insulated connectors, lugs sleeve etc. are tested with the help of the tensile strength machines. The measurements of mechanical characteristics of metals, alloys and plastics are taking place at the tensile strength machines as well.

Tests of the connection contacts with the effects of salt fog

The test is carried out to determine the possibility of using the connectors in a wet environment and in the presence of salts. According to the test results, conclusions are given about the possibility of using connectors with different types of galvanic coatings in the severe climatic conditions, as well as the possibility of using means of stabilizing electrical resistance. Tests are carried out according to GOST 20.57.406-81 at periodic or continuous spraying of saline solution.

The level of equipment and access of the laboratory testing allows us to conduct periodic tests of electrical equipment of the laboratory and electrical protective equipment without the involvement of outsourcing organizations.

Testing of the means of electrical protection

The tests are carried out in accordance with the "Instructions for usage and testing of protective equipment in electrical installations". The frequency of tests is specified in Annex 7 " Instructions..."

Measurement of the resistance of grounding devices and soil resistivity

Measurement is carried out in accordance with the requirements of "The Rules of the technical operation of electrical consumers (PTEEP)", tables 35 and 36, which indicate the maximum permissible resistance of grounding devices of electrical installations and grounding. At high resistivity of the soil the norms of permissible values of resistances of grounding devices are stated in "The Rules of the device of electrical equipment (PUE). Seventh edition. Chapter 1.7".

Insulation resistance measurement

The test is carried out in accordance with the requirements of the «The Rules of the technical operation of the electrical consumers (PTEEP)", table 37, which specifies the minimum allowable values of insulation resistance of elements of electrical networks up to 1000 V.

Check for a circuit between the earths and grounded elements

Inspection of protective conductors is carried out in accordance with the requirements of paragraphs 1.7.139; 1.7.126; 1.7.127; 1.7.144 PUE and 2.7.6; 28.5 of Annex 3 pteep. The contact resistance must not exceed 0.05 Ohm.

Check of the protection operation at the power supply system with the grounded neutral

In this test, the total resistance of the circuit is measured, the short circuit current is calculated, and the resulting value is compared with the value of the current of the protection machine. In addition, the time-current characteristic is determined by the time of the protection. Requirements to the value specified in clause 28.4 of Annex 3, pteep p.1.7.79 PUE.

The check of safety disconnection devices

In the control of the protective devices to measure the trip current of the RCD and the off time of the RCD, which are normalized p.1.7.79 PUE.