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Table 1: Substation part
Serial number | Pilot projects | Category | Recommended equipment |
1 | High voltage cable | The cable fault tester handles the fault point of the faulty cable. Recommended outside the project regulations | |
The AC withstand voltage test of high-voltage cables is to check whether the cable head that can be processed by the cable meets the requirements of operating voltage. Because the implementation of power frequency withstand voltage is poor, it is recommended to use a variable frequency series resonance experimental device | |||
2 | Nuclear phase | Phase check of the line | |
3 | Insulator | Zero value insulator detection |
Table 2: Insulating medium (SF6 gas and insulating oil part)
Serial number | Pilot projects | Category | Recommended equipment |
1 | Insulating oil | Dielectric strength test of insulating oil | YNJY-1001 Insulating Oil Dielectric Strength Tester (Single Cup) |
Dielectric loss test of insulating oil | |||
Moisture test for insulating oil | |||
2 | Microcomputer integrated protection device | Inspection of welded joints and airway connections of sealed gas chambers | |
Verification and calibration of gas relay | |||
Test the water content in SF6 gas |
Table 3: Secondary protection part
Serial number | Pilot projects | Category | Recommended equipment |
1 | CT volt-ampere characteristics | For the 5% or 10% error curve and change of CT, polarity measurement is performed to verify whether it meets the requirements of the protection device. | YNFA-II transformer volt-ampere ratio and polarity comprehensive tester |
2 | Microcomputer integrated protection device | Test the fixed value of the microcomputer integrated protection device, test the whole group of projects, and test the linkage projects. |
Table 4: Oil test part
Serial number | Pilot projects | Category | Recommended equipment |
1 | Insulation safety tools, transformers, circuit breakers, insulators, etc. | Tests for insulation resistance, absorption ratio, and polarization index of transformers; tests for insulation resistance of insulators and insulating sleeves. | |
DC leakage test of transformer | |||
Verification and calibration of gas relay | |||
YNXC/TC test transformer control box (set) | |||
FDB discharge protection ball gap | |||
Dielectric loss measurement of transformers, PT, CT insulation bushings, etc. | |||
Contamination salt density test on insulators | |||
2 | Transformer, PT, CT, fox-killing coil, reactor | Test the coils of transformers, PTs, CTs, reactors, etc. for internal welding defects and for inter-turn interlayer short circuits, as well as measuring the tap position of the transformer. | |
Test the transformer's transformation ratio group, PT, single-phase transformer's transformation ratio polarity, etc., to understand whether the change, group, and polarity meet the parallel (series) operation conditions. | |||
Transition time of on-load tap changer, transition resistance test | |||
3 | High voltage circuit breaker (switch) | In the closed state, measure the contact resistance of the circuit breaker, load switch, etc. to see if it meets the operating conditions. | |
Test the time characteristics and mechanical characteristics (dynamic characteristics) of high-voltage circuit breakers to understand whether they meet the requirements of system operation. | |||
For the vacuum test of the vacuum circuit breaker, see if the arc extinguishing conditions are met. | |||
4 | Zinc oxide arrester | Test the coils of transformers, PTs, CTs, reactors, etc. for internal welding defects and for inter-turn layer short circuits, as well as measurement of transformer tap positions. | |
Measure the U1mA and 0.751mA of the zinc oxide arrester to check whether it meets the system operation requirements | |||
Measure resistive current, capacitive current component and full current under AC operating voltage. Judge whether the arrester is running with disease | |||
Lightning arrester discharge counter test to check whether the counter action is normal |
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