When lifting transformers, special attention should be paid to protecting the overlapping pile heads and porcelain bottles of transformers. The necessary bandage protection should be carried out in the places where the crane contacts with the equipment to prevent the damage of the equipment. After the crane is stressed, check whether the center of gravity of the hook and the equipment is consistent, and adjust it. When the equipment is towed, the hand-pulled hoist installed in the transformer room is hung on the towing Jack rope at the bottom of the transformer. The transformer is slowly pulled into the transformer room along the track by the hand-pulled hoist, and the necessary cooperation is carried out by the crane during the towing process. After loosening the hook of the crane, the transformer is slowly dragged onto the track and put in place.
When installing transformers, special attention should be paid to check whether the high-voltage wire package is damaged or displaced, whether the high-voltage insulator is rubbed or damaged, and whether the humidity control devices, including humidity display instruments, are complete. During construction, no sundries are allowed to fall into the transformer barrel. The main iron core and shell are grounded reliably. The working grounding section should meet the requirements of the code, at least not less than the section of the main grounding line in the transformer substation. Transformers should be positioned in the direction of high and low voltage sides, and must not be mistaken. Transformer body should be placed horizontally. The tolerance error of installation horizontality is 2, and the tolerance error of perpendicularity is 1.5. According to the requirements of the transformer factory, the vibration isolator of the transformer is installed after the transformer is in place, and then the on-load voltage regulator, temperature measuring device, control box and other accessories are installed.
The test items are required for 110kV/220kV substation acceptance and maintenance testing(with corresponding tester types):
|
Test Object |
Testing Item |
Tester Type |
|
|
Cable |
Cable AC Hipot Testing |
JYCX |
|
|
Cable Insulation Resistance Testing |
JYM KYORITSU |
||
|
Transformer |
Insulation Resistance of Winding |
JYM KYORITSU |
|
|
DC Leakage Testing in 1min |
JYDHV |
||
|
Winding Resistance Testing |
JYR50S |
||
|
Winding Deformation Testing |
JYP |
||
|
Turns Ratio Testing |
JYT-A |
||
|
AC Hipot Testing |
JYCX |
||
|
Short Circuit Impedance Testing |
JYW6300 |
||
|
Dan Delta Testing |
JYC |
||
|
Oil Breakdown Voltage (BDV)Testing |
JY6611 |
||
|
Oil Tan Delta Testing |
GTD-61A |
||
|
Switchgear |
Circuit Breaker/Disconnector Resistance |
JYL-200B |
|
|
Relay |
Relay Performance |
JY7003G |
|
|
On-load |
On-load Switchgear Testing |
JYK-I |
|
|
Tap Changer Dynamic Testing |
JYK-I |
||
|
Instrument Transformer |
Current Transformer (CT)Testing |
JYH-C |
|
|
Potential Transformer (PT)Testing |
JYH-C |
||
|
Surge Arrestor |
Zinc Oxide Characteristics Testing |
JY6800 |
|
|
1mA DC Reference Voltage |
JYDHV |
||
|
Capacitor |
Capacitor Current |
JY6700 |
|
|
Capacitor Inductance |
JY6700 |
||
|
Ground Grid |
Grounding Down Lead Earth |
JYD |
Related Articles:
What Test Items are Required for 110kV/220kV Substation Acceptance and Maintenance Testing?
What Tests Must be Done before the Transformer Leaves the Factory?
Main Factors Affecting the Operating Life of Transformers
What is the Purpose of Measuring the DC Resistance of the Transformer Winding?
Points to note in transformer oil breakdown voltage (BDV) test
DC winding resistance tester with 500 times tests on a single charge -JYR9310