| Delivery |
| Product delivery |
The model and quantity of the STSs received by the customer are consistent with those in the contract. |
Visual inspection |
PASS |
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| Consistency between the packing list and delivered products |
The packing list consists of the delivered products.
The spare parts and accessories are complete and delivered with the STS. |
Visual inspection |
PASS |
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| Overall STS |
| STS appearance |
1. The enclosure of the STS is free of damage, dents, and cracks.
2. If there is a small area of rust, paint the area according to the user manual. A large area (0.5 m2 or above) of rust is not allowed. |
Visual inspection |
PASS |
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| STS sealing |
The sealing rubber strips are intact and do not fall off.
There is no crack in the sealing areas. |
Visual inspection |
PASS |
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| Screen doors of the transformer room |
The screen doors of the transformer room are intact without deformation. |
Visual inspection |
PASS |
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| Doors of low-voltage (LV) and medium voltage (MV) rooms |
The doors are closed tightly. No water or foreign matter is found in the LV or MV room. |
Visual inspection |
PASS |
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| STS Installation |
The STS is installed at the specified position. |
Visual inspection |
PASS |
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| STS stability |
The STS is securely installed in the right position without tilt or force around.
The onsite foundation meets the requirements in the STS user manual. |
Visual inspection |
PASS |
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| STS grounding |
The screws on the ground point of the enclosure are tightened and aligned with the marked lines.
The ground label at the ground point is intact. |
Visual inspection |
PASS |
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| Grounding of the transformer and doors of the container, LV panel, and MV room |
The transformer and doors of the container, LV panel, and MV room, as well as other accessible places, are grounded, grounding labels are in place, and ground cables are securely connected. |
Visual inspection |
PASS |
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| STS grounding |
Measure the resistance between two ground points by using a ground resistance tester. |
Test inspection |
PASS |
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| Damage or shifts of the components in the STS |
All components in the STS are free of damage, deformation, and visible shifts. |
Visual inspection |
PASS |
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| Cables in the STS |
Cables in the STS are securely installed. |
Visual inspection |
PASS |
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| Total capacity of the connected inverters |
The total capacity of the connected inverters does not exceed the rated capacity of the STS. |
Visual inspection |
PASS |
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| Cross-sectional areas of input and output power cables |
The cross-sectional areas of the input and output power cables are within 30 mm away from each other as specified in the installation manual (pg 106). |
Visual inspection |
PASS |
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| Connections of input and output power cables as well as communications cables |
All cables are secured to prevent disconnection or safety incidents. |
Visual inspection |
PASS |
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| Bend radius of AC power cables |
The cable bend radius is at least 15 times the cable cross-sectional area (50-500 mm2). A small bend radius will result in excessive stress on the power cable, exerting negative impact on the device. |
Visual inspection |
PASS |
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| AC power cables and communications cables reserved in the STS for the Smart Array Controller (SACU) |
1. The AC power cables and communications cables reserved in the STS for the SACU are correctly connected to the SACU. The PG connectors at the holes for cables between the SACU and the STS are sealed.
2. Both ends of the reserved AC power cables and communications cables (if unused) are not energized (the switches in the LV panel are turned off or the cables are removed). The cables are properly protected and the PG connectors at the holes for cables between the SACU and the STS are intact. |
Visual inspection |
PASS |
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| LV Room |
| LV panel stability |
The panel and internal components are secured reliably and securely. |
Visual inspection |
PASS |
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| LV panel reliability of cable connections |
The internal cables are securely connected and aligned with the marked lines. |
Visual inspection |
PASS |
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| LV panel grounding reliability |
The panel is well grounded inside. The screws on the ground point are tightened and aligned with the marked lines.
The ground label at the ground point is intact. |
Visual inspection |
PASS |
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| LV panel foreign matter |
There is no foreign matter such as tools and cable residue in the panel. |
Visual inspection |
PASS |
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| LV panel bottom sealing |
The cable holes at the bottom of the LV panel have been sealed using firestop putty. |
Visual inspection |
PASS |
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| LV panel copper bars |
The copper bars in the LV room of the STS are not loose, disconnected, or deformed. |
Visual inspection |
PASS |
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| Cable labels |
Labels on incoming AC power cables of the LV panel are intact and legible. |
Visual inspection |
PASS |
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| Connection of AC cables |
Adjust the torque wrench to a proper torque and rotate the handle to ensure that the screws tightened. |
Test inspection |
PASS |
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Screws are not loose. Screws for the incoming cables of the LV panel are tightened to the standard torque. Do not impose large stress on the screws. Max torque of 5 N·m. |
| LV panel switches |
Turn on and off the disconnectors, miniature circuit breakers (MCBs), and molded case circuit breakers (MCCBs) in the LV panel. |
Test inspection |
PASS |
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The disconnectors, MCBs, and MCCBs in the LV panel can be turned on and off. |
| Transformer |
| Transformer enclosure |
The transformer enclosure is free of defects and paint peeling. |
Visual inspection |
PASS |
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| Transformer enclosure grounding |
The screws on the ground point of the enclosure are tightened and aligned with the marked lines.
The ground label at the ground point is intact. |
Visual inspection |
PASS |
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| Transformer sealing |
Check all sealing rings of the transformer, including the seal of the transformer box, oil level meter, oil temperature meter, heat sink, oil drain valve, butterfly valve, and tap changer. |
Test inspection |
PASS |
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| Transformer pressure release valve |
The clamping plate for the pressure release valve is removed, and the actuating strut of the pressure release valve is in the normal position. |
Visual inspection |
PASS |
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| Transformer gas relay |
There is no gas in the transformer gas relay (gas needs to be released if any). |
Visual inspection |
PASS |
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| Transformer butterfly valve |
The butterfly valves on both sides of the gas relay are open. |
Visual inspection |
PASS |
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| Transformer oil temperature indicator (OTI) and winding temperature indicator (WTI, if any) |
The appearance of the OTI and WTI (if any) is normal, the pointer indication is normal, and there is no foreign matter in the watch face. |
Visual inspection |
PASS |
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| Transformer oil level meter |
1. The oil level meter can be observed without obstacles.
2. The indicated oil level is in accordance with the oil level-oil temperature curve of the transformer. |
Visual inspection |
PASS |
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| Transformer dehydrating breather |
Before the STS is put into operation, the dehydrating breather is properly installed. The dehydrating breather (common model) appearance is normal and intact, and the color of the silicon gel is normal. If the color of more than half of the silicon gel is abnormal, replace the silicon gel in the dehydrating breather. |
Visual inspection |
PASS |
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| Transformer tap changer setting |
The transformer tap changer is set to position 3 before delivery. Adjust the tap changer position based on site requirements and tighten the protective cover. |
Visual inspection |
PASS |
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| Ring Main Unit - MV Room |
| MV room stability |
All internal components are securely installed without shifting or loosening. |
Visual inspection |
PASS |
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| MV room reliability of cable connections |
The internal cables are securely connected and aligned with the marked lines. |
Visual inspection |
PASS |
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| MV room grounding reliability |
The screws on the indoor ground point of the enclosure are tightened and aligned with the marked lines.
The ground label at the ground point is intact. |
Visual inspection |
PASS |
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| MV room foreign matter |
There is no foreign matter, such as tools and cable residue, in the MV room. |
Visual inspection |
PASS |
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| MV room gas pressure indicator of the ring main unit |
Check and record the value of the gas pressure indicator of the ring main unit. If a ring main unit indicator is used, record the color of the pointed area. |
Test inspection |
PASS |
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| Connection of incoming and outgoing AC cables |
Adjust the torque wrench to the proper torque and rotate the handle to ensure that the screws are tightened. |
Test inspection |
PASS |
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Secure MV outgoing cables, see the specifications of the cable connector purchased by the customer. Do not impose large stress on the screws. If M8 screws are used, the torque must be greater than 5 N·m. If M10 screws are used, the torque must be greater than 12 N·m. |
| MV room switch off the ring main unit |
Turn on and off the switches of the ring main unit. |
Test inspection |
PASS |
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The switches of the ring main unit can be turned on and off normally. |
| MV room switches in the auxiliary power distribution box |
Turn on and off the fuses and circuit breakers in the auxiliary power distribution box. |
Test inspection |
PASS |
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The fuses and circuit breakers can be turned on and off normally. |
