Beijing Jront Control Technology Co.,Ltd together with the American Electric Company and the Danish R&D Company, has launched a new business model, providing on-site measurement services and equipment rental services while providing comprehensive technical support to customers.

1) Motor fault test solution - carry out the following low voltage and high voltage tests recommended by the American Clean Energy Association (AWEA)

Insulation resistance 

Polarization index (PI)

Winding resistance

High potential (withstand voltage) test

Step voltage

Surge comparison

Partial discharge 

The operation and maintenance technicians are provided with the electrical test data required to verify the health and insulation condition of the generator. The low voltage electrical test is used to ensure that the generator can be powered on safely and will not fail immediately. The higher voltage test can be used as a prediction tool to indicate the service life of the generator winding.

The trend results will provide more references for motor maintenance, so that motor maintenance personnel have more time to make wise decisions.

The motor maintenance and test solution shall meet the following requirements:

"IEEE Recommended Practice for Insulation Testing of High DC Voltage AC Motors (2300 V and Above)", IEEE Std 95-2002 (IEEE Std 95-1977 Revision), Volume 1-56, Page 1-56, April 12, 2002, doi: 10.1109/IEEESTD.2002.93574. Implement IEEE 522-2004 Test Guide Standard for Inter-turn Insulation of Form-wound Stator Coil of AC Motor

"IEEE Recommended Standard for Testing the Insulation Resistance of Electric Machines", published in IEEE Std 43-2013 (IEEE Std 43-2000 Revision), Volume 1-37, Page 1-37, March 6, 2014 doi: 10.1109/IEEESTD.2014.6754111.

German Institute for Standardization, iec61934 standard

DIN IEC/TS 61934-2012 Electrical insulating materials and systems Electrical measurement of partial discharge (PD) under short rise time and repeated voltage pulse (IEC/TS 61934-2011)

British Standards Institute, iec61934 standard

BS DD IEC/TS 61934-2011 Electrical insulating materials and systems - Electrical measurement of partial discharge (PD) under transient rise and repeated impulse voltage

BS DD IEC/TS 61934-2011 Electrical insulating materials and systems - Electrical measurement of partial discharge (PD) under transient rise and repeated impulse voltage

International Electrotechnical Commission, iec 61934 standard

IEC TS 61934:2011 Electrical insulating materials and systems - Electrical measurement of partial discharge (PD) under short rise time and repetitive voltage pulses

IEC TS 61934-2011 Electrical insulating materials and systems - Electrical measurement of partial discharge (PD) under short rise time and repetitive voltage pulses

IEC/TS 61934-2011 Electrical insulating materials and systems - Electrical measurement of partial discharge (PD) under short rise time and repeated voltage pulse

IEC/TS 61934-2006 Electrical insulating materials and systems - Electrical measurement of partial discharge (PD) under short rise time and repeated voltage pulse

2) Bolt clamping force test solution - DNV's component certificate has been obtained and can be fully used for service inspection of wind turbines.

Bolts are important components of most machinery or structures in many fields, such as wind turbines, bridges, power plants, mining equipment, large road signs, etc. Because bolts are crucial to the integrity and functionality of the structure, more and more people realize the importance of correctly tightening the central bolt connection of the joint.

Using ultrasonic measurement to measure the elongation of new bolts and existing bolt fasteners has proved to be a very accurate, reliable and cost-effective solution.

Through this method, not only the correct bolt pre-tightening force can be achieved when installing new bolts, but also the existing bolt status can be evaluated when determining the service life limit of the fan.

Our solution is suitable for most bolt types and does not require special pretreatment of bolts. It also won the innovation award at the 2019 Danish Wind Energy Conference and the DNV-GL product certification, allowing the equipment to be used for service and maintenance inspection.

The PCT application of the international patent agency has been approved. We have obtained this globally granted patent.

3) Power quality of wind power generation installation -- measurement and evaluation system

The system provides an evaluation method, which conforms to IEC61400-21 standard, and is used to evaluate the expected power quality of a single wind turbine or wind turbine deployed on a specific site.

Standards and test contents

1. Basis standard:

The standard for power quality test of wind turbines is IEC 61400-21:2008 Measurement and assessment of power quality characteristics of grid connected wind turbines.

2 Test content:

Including conventional electrical parameter analysis, IEC mode electrical parameter analysis, measurement and analysis of harmonics, interharmonics, voltage flicker and other indicators.

The optional parts can also complete the tests of high-frequency harmonics, harmonic 5Hz components, virtual flicker and low voltage traversal.

Power quality analysis

Harmonics and interharmonics

1. Harmonic analysis, supporting up to 100 harmonic calculations, histogram representation

2. IEC harmonic analysis (corresponding to IEC 61000-4-72009, GB/T 243372009)

3. Interharmonic analysis (corresponding to IEC 61000-4-72009, GB/T 243372009)

4. High frequency harmonic analysis (2-9kHz): corresponding to IEC 61000-4-72009 (option function)

5. 5Hz component analysis (5Hz-3000Hz) (option function)

3. According to IEC 61400-21 standard, wind turbine power quality test supports the following special test contents:

1. Voltage flicker test and manual switch test correspond to IEC 61000-4-152010

2. Virtual flicker analysis (option function) corresponds to IEC 61400-21 and IEC61000-4-152010

3. Current harmonic test based on standard IEC61000-3-2 [Eb5.0]

4. Current harmonic test based on IEC61000-3-12 [Eb2.0]

5. Wind power harmonic test

6. Grid-connected low voltage ride through test (option function) corresponds to IEC61400-21

4. The power wave recording and power quality analysis software developed according to IEC 61400-21 standard fully meets the prepared test requirements, and mainly has the following functions:

Ⅰ. Standard version function

1). Support up to 16 channels, that is, 8 power modules for simultaneous measurement

2). Real-time analysis and calculation, with the fastest analysis and calculation cycle of 100ms. Support IEC mode analysis cycle operation

3). Set the system wiring group freely and measure accordingly

4). Free selection of display group and display channel

5). Support the calculation of electrical parameters of power module and wiring group

6). Harmonic analysis, supporting up to 100 harmonic calculations, histogram representation

7). IEC harmonic analysis and interharmonic analysis (corresponding to IEC 61000 4 72009, GB/T 243372009

8). Support up to 100 channels of user-defined function calculation

9). Support real-time waveform recording while analyzing and calculating

10). Support interval data statistics

11). Voltage flicker test and manual switch test (corresponding to IEC 61000 4 152010

12). Current harmonic test 16A and below based on standard IEC61000 3 2 [Eb5.0])

13). Current harmonic test based on standard IEC61000 3 12 [Eb2.0] (>16A and=<75A equipment)

14). Wind power harmonic test

Ⅱ. High frequency harmonic function package (option function)

1.2k 9kHz high-frequency harmonic analysis corresponds to IEC 61000 4 72009

2. Harmonic 5Hz component analysis

3. Special test of high-frequency components in electric harmonics

Ⅲ. Measurement function package for electrical characteristics of grid-connected PV inverter (option function)

1. Grid-connected low voltage ride-through test corresponds to IEC61400 21

2. Virtual flicker analysis and switch switching test correspond to IEC61400 21, IEC61000 4 152010