Huawei Smartkits V100R002C00 User manual

Smartkits
V100R002C00
Guide to Transformer Low Voltage
Bushing Replacement (No
Handhole Replacement)
Issue 01
Date 2021-11-22
HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

Copyright © Huawei Digital Power Technologies Co., Ltd. 2021. All rights reserved.
No part of this document may be reproduced or transmitted in any form or by any means without prior
written consent of Huawei Digital Power Technologies Co., Ltd.
Trademarks and Permissions
and other Huawei trademarks are the property of Huawei Technologies Co., Ltd.
All other trademarks and trade names mentioned in this document are the property of their respective
holders.
Notice
The purchased products, services and features are stipulated by the contract made between Huawei
Digital Power Technologies Co., Ltd. and the customer. All or part of the products, services and features
described in this document may not be within the purchase scope or the usage scope. Unless otherwise
specied in the contract, all statements, information, and recommendations in this document are
provided "AS IS" without warranties, guarantees or representations of any kind, either express or implied.
The information in this document is subject to change without notice. Every eort has been made in the
preparation of this document to ensure accuracy of the contents, but all statements, information, and
recommendations in this document do not constitute a warranty of any kind, express or implied.
Huawei Digital Power Technologies Co., Ltd.
Address: Huawei Digital Power Antuoshan Headquarters Futian,Shenzhen 518043 People's
Republic of China
Website: https://e.huawei.com
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Ltd.
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Contents
1 Overview....................................................................................................................................1
2 Tool Introduction..................................................................................................................... 2
3 Replacement Procedure......................................................................................................... 7
3.1 Cut o the power supply of STS........................................................................................................................................ 7
3.2 Replacement Procedure........................................................................................................................................................ 7
3.3 Restore the power supply of STS.....................................................................................................................................36
3.4 Observe the STS repair....................................................................................................................................................... 36
Smartkits
Guide to Transformer Low Voltage Bushing
Replacement (No Handhole Replacement) Contents
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Ltd.
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1 Overview
The low-voltage bushing is located on the side of the transformer body and is
used to connect the cabinet busbar to the low voltage transformer coil.If the low-
voltage bushing or sealing gasket is damaged，it may cause discharge or oil
leakage，and need to replace the lowlow-voltage bushing or gasket.
Low-voltage bushing has the following 2 structures:
Smartkits
Guide to Transformer Low Voltage Bushing
Replacement (No Handhole Replacement) 1 Overview
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Ltd.
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2 Tool Introduction
Major equipment and spare parts will be obtained from China by mail.
CA UTION
Perform the repair operation only after the spare parts and tools are ready.
No. Materi
al
picture Remarks
1 oil
storage
bag
Quantity: 1
Capacity: 2000L
Inner diameter of matching
tubing: 25 mm
Oil lling port position: middle
of the top
Valves: with
Flange sealing cap: with
2 oil
pump
Quantity: 1
Voltage: 12 V
Power: ≥ 500 W
Inner diameter of matching
tubing: 25 mm
Smartkits
Guide to Transformer Low Voltage Bushing
Replacement (No Handhole Replacement) 2 Tool Introduction
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Ltd.
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No. Materi
al
picture Remarks
3 blower Quantity: 1
Voltage: 12 V (or manual)
Hose Size: Match Breathing
Tube
4 Waterp
roof
pad
Quantity: 1
Dimension: 2 x 2 m
5 Tube Quantity: 2
Inner diameter: 25 mm
Length 1: 2 m x 1
Length 2: 4 m x 1
6 Flange Quantity: 2
Inner diameter of matching
tube: 25 mm
Outer diameter 1: matching
top drain valve
Outer diameter 2: matching
bottom drain valve
Smartkits
Guide to Transformer Low Voltage Bushing
Replacement (No Handhole Replacement) 2 Tool Introduction
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Ltd.
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No. Materi
al
picture Remarks
7 support
rod
Quantity: 8 sets
Length: 35 cm
Nut: M12*2
Flat washer: M8*2
8 ratchet
wrench
Quantity: 2 sets
Socket: M18*2
9 spanne
r
Quantity: 2
Size: M18
10 Adjusta
-ble
wrench
Quantity: 1
Hole opening range: > 30 mm
11 Hold
hoop
Quantity: 8
Size: matching inner diameter
25 mm casing
12 raw
materi
al belt
Obtained locally (not available
by air)
Smartkits
Guide to Transformer Low Voltage Bushing
Replacement (No Handhole Replacement) 2 Tool Introduction
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Ltd.
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No. Materi
al
picture Remarks
13 Step
ladder
Locally obtained (the volume
is too large)
14 grease Obtained locally (not available
by air)
15 Battery Obtained locally (not available
by air, car batteries are
available)
16 cleanin
g cloth
Obtained locally
(consumables)
17 buckets Locally obtained
Smartkits
Guide to Transformer Low Voltage Bushing
Replacement (No Handhole Replacement) 2 Tool Introduction
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Ltd.
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No. Materi
al
picture Remarks
18 Low-
voltage
bushin
g
Quantity: on demand
Smartkits
Guide to Transformer Low Voltage Bushing
Replacement (No Handhole Replacement) 2 Tool Introduction
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3 Replacement Procedure
CA UTION
The low-voltage bushing shall be replaced in clear and windless weather to avoid
wind, sand or rain pollution of transformer oil.
NO TE
After all the materials are ready, repair the equipment.
3.1 Cut o the power supply of STS
3.2 Replacement procedure
3.3 Restore the power supply of STS
3.4 Observe the STS repair
3.1 Cut o the power supply of STS
Step 1 Switch o G2 cabinet circuit breaker, switch o G2 cabinet isolation switch and
switch on G2 cabinet earthing switch.
Step 2 Switch o the ACB of low-voltage cabinets LVA and LVB.
----End
3.2 Replacement Procedure
Step 1 Connect the oil storage bag, oil pump and ange with oil pipe, and x the oil pipe
with throat hoop.
Smartkits
Guide to Transformer Low Voltage Bushing
Replacement (No Handhole Replacement) 3 Replacement Procedure
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Step 2 Connect ange and drain valve at the bottom of transformer.
Step 3 Connect oil pump and battery
Smartkits
Guide to Transformer Low Voltage Bushing
Replacement (No Handhole Replacement) 3 Replacement Procedure
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NO TE
Directly connect to the car's battery without removing the battery. If the battery is
insucient, start the vehicle when the oil pump is started , keep the engine running.
Step 4 Remove the dehydrating breather.
Step 5 Remove the xing clip of the breathing tube.
Smartkits
Guide to Transformer Low Voltage Bushing
Replacement (No Handhole Replacement) 3 Replacement Procedure
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Step 6 Take down and remove the breathing tube.
Step 7 Loosen the air exhausting plug at the top of the oil conservator and cover it with
a cleaning cloth.
Smartkits
Guide to Transformer Low Voltage Bushing
Replacement (No Handhole Replacement) 3 Replacement Procedure
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Ltd.
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Step 8 Open the oil drain valve of the transformer and the valve of the oil storage bag,
and start the oil pump to start oil drain.
NO TE
1. The oil level begins to slowly decrease at the time of oil draining and nally drops to 0.
2. When the oil in the conservator is exhausted, the contact surface of transformer oil and
air can be seen through the gas relay observation window.
3. When the rst oil storage bag is full of oil, stop oil draining, close the transformer oil
drain valve, and close the oil storage bag valve.
Smartkits
Guide to Transformer Low Voltage Bushing
Replacement (No Handhole Replacement) 3 Replacement Procedure
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Step 9 Close the gas relay valve.
Smartkits
Guide to Transformer Low Voltage Bushing
Replacement (No Handhole Replacement) 3 Replacement Procedure
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Ltd.
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Smartkits
Guide to Transformer Low Voltage Bushing
Replacement (No Handhole Replacement) 3 Replacement Procedure
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Step 10 Open the cover plate of the busbar chamber of the low-voltage cabinet.
Step 11 Remove the connecting ange between the transformer and the low-voltage
cabinet.
Step 12 Remove the connection between the faulty bushing and the soft copper bar.
Step 13 Remove the box cover bolts and collect the bolts in a box or jar to avoid loss.
Smartkits
Guide to Transformer Low Voltage Bushing
Replacement (No Handhole Replacement) 3 Replacement Procedure
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S
Step 14 Install the lifting screws at the four corners of the box cover.
Smartkits
Guide to Transformer Low Voltage Bushing
Replacement (No Handhole Replacement) 3 Replacement Procedure
Issue 01 (2021-11-22) Copyright © Huawei Digital Power Technologies Co.,
Ltd.
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NO TE
1. Use a wrench to pry up a corner of the box cover, place the nut and two at washers into
the pry-up gap, and align the screw holes.
2. Apply lubricating grease on the screw.
3. Insert the screw from the top.
4. Install the other 3 lifting guides in the same way
5. Check whether the cables hinder the lifting of the box cover to prevent cables from being
damaged by the lifting of the box cover.
Smartkits
Guide to Transformer Low Voltage Bushing
Replacement (No Handhole Replacement) 3 Replacement Procedure
Issue 01 (2021-11-22) Copyright © Huawei Digital Power Technologies Co.,
Ltd.
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Step 15 Lift box cover approx. 3 cm
Smartkits
Guide to Transformer Low Voltage Bushing
Replacement (No Handhole Replacement) 3 Replacement Procedure
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Ltd.
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