Industry Information

Electromechanical equipment installation projectsSkills and pipeline engineering installation and construction skills

1. Engineering skills for electromechanical equipment installation

The key integral moment constant of the unit of assignment is detailed

The total time constant for overflow maintenance is the total time constant of the current element and the total time constant of time element 2. The all-time constant of the overload alarm is the all-time constant of the overload current element and the all-time constant of component 3. Overvoltage normalization constant—overvoltage range-normalization constant and overvoltage normalization constant: 4. The three-phase power supply is the constant for the entire reclosing process - the constant for the entire reclosing process and the constant for the reclosing angle 5. Zero-sequence overflow maintenance all-time constants—the all-time constant of the current element, the all-time constant of the time element, and the all-time constant of the direction element.

Transformer operation switching test

Transformer Working Switching Test (3 Measurements, 3 Tests, 3 Inspections)

1. Measure winding resistance and waterproof sleeve resistance;

2. Measure the grounding resistance of the transformer core and clamps;

3. Measure winding resistance and grounding resistance and absorption ratio of waterproof bushings;

4. Insulating oil test or SF6 gas test;

5. Winding resistance and waterproof sleeve connection pressure test

6. Impulse closing test at rated current;

7. Check all taps voltage ratios;

8. Check the three-phase electrical connection group of the voltage regulator;

9. Viewing Stage.

Transmission line connection requirements

1. Transmission lines with different raw materials, cross-sections, or torsion directions can only be connected using jump rods.

2. The mechanical strength of joints must not be less than 90% of the power of the transmission line itself, and resistors must not exceed 1.2 times the mechanical strength of transmission lines of the same length.

3. For jumper connections such as tie rods and support rods, T-line frames and slots can be selected as cable branch connections.

4. The riveting methods for overhead cables can be divided into clamp connections, hydraulic connections, and burst connections. <

2. Pipeline engineering installation and construction skills

Gate valve test

Gate valves should undergo sleeve pressure tests and sealing tests

Clean water should be used for pressure and sealing tests of gate valve housings, and chloride ion content in the water must not exceed 25 ppm during stainless steel valve testing.

The gate valve housing pressure test is 1.5 times the allowable working pressure at 20°C, and the sealing test is 1.1 times the allowable working pressure at 20°C. The test duration must not be less than 5 minutes. The test temperature is 5-40°C; if it is below 5°C, heating measures should be adopted.

Pressure regulation and sealing tests of gate valves should be calibrated according to national standards and planning data. The calibration of the safety valve should be well documented, sealed, and submitted together with the calibration report.

Conditions before pipeline system testing

The pipeline installation quality qualification test plan within the test scope has been passed, and safety skills disclosure has been provided.

Temporary restraint devices have been installed on the compensators on the pipelines.

The test pressure gauge has been calibrated during weekly inspection, with an accuracy not less than grade 1.6. The full scale of the gauge should be 1.5~2 times the measured working pressure, and there should be no fewer than 2 pressure gauges.

Installation of electromechanical equipment

According to the test plan, reinforce the pipelines, distinguish control circuits, and reinforce component maintenance pipelines. IVF channels have been separated from unrelated systems by a blind plate or other isolation measures. The gate valve, rupture disc, and instrument components have been removed or fixed inside the waiting pipeline.

Key to pipeline pressure testing

The test working pressure should be 1.15 times the planned working pressure, and the test working pressure for the vacuum solenoid valve should be 0.2MPa.

The test should be equipped with a working pressure release device, and the set working pressure must not exceed 1.1 times the test working pressure.

Before the test, air is selected as the pre-test pressure, which should be 0.2MPa.

During the test, pressure should be applied. When the working pressure rises to 50% of the test working pressure, if there are no abnormalities or leakage, the pressure should be gradually adjusted.

The above is our introduction on how to handle electromechanical engineering equipment. More about itElectromechanical installationFor pricing information, please consult the website of RunTay Electromechanical Installation Equipment Manufacturer.