Repair & Maintenance

Faulty Transformer Repairing Services

A transformer is an electrical device used for energy transformation by electromagnetic induction between two or more circuits. Like all electronic devices, faults also happen in the transformer, which causes failures. One failure can cause many problems. A simple fault at the distributing end can cause failures. One failure can cause many problems. A simple fault at distributing end can cause a blackout of power to the whole area. The fault can also be very dangerous as the transformer contain a large quantity of oil in direct contact with high-voltage components. This increases the risk of fire and explosions due to failures. Different faults are caused by different reasons, impacting the power system differently.

Minor repairs to faulty distribution transformer constitute replacement of one limb/bushing of the transformer, attending to loose contact /filtering of oil etc.
Major repairs to faulty distribution transformer constitute of all required accessories such as HT, LT, coils, bushing lamination (CRGO)reconditioning tank, filling oil (after filtering), improving insulation level and repaired transformer shall fully be tested by meters and testing division and the tested transformers before releasing to the customer.

Transformer Repair Process

Collection of the transformer from the client
Store Registration

Faulty Transformer inspection

Six key steps to be applied

Physical inspection
General inspection, a report jointly signed with client representatives

Production &Assemble line

Detect faulty as per inspection report
Repairing process
Replace damaged parts
Drying cores for 48hrs
Oil refill or filtering
Assemble

Production assemble line

Six key tests to be applied

Physical appearance inspection
Test report of repaired transformers to be generated

Release

Registration with store data
Prepare delivery note
Arrange logistics to deliver back to the client

Transformer Lifecycle Management Service

As with every other technical system, transformers are subjected to a certain amount of wear during operation. Yocean TLM covers a wide range of services to significantly lengthen the operation time of your transformers and, therefore, optimize utilization over the entire operation time:

Condition assessment and diagnostics
Online monitoring
Consulting and expertise
Maintenance and lifecycle extension
Spare parts and accessories
Repair and retrofit

Technical Specification

Power: 30-31500kVA
Voltage level: 10/0.4kV,20/0.4kV,35/10.5kV
Frequency: 50/60Hv
Number of phases: three-phase or single phase
Tap changing methods: Off-circuit or no-load tap change
Tapping range: ±5% or 2*2.5% or according to users requirements
Connection Symbol: Yyn0 or Dynll or according to clients’ requirements
Short circuit impedance: 4% or 6% or according to the client’s requirements

Oil-Immersed Transformer

Technical parameter of S-50-2500/35 Series low-loss distribution transformer

Type	HV	LV	Po kW	Pk75⁰C kW	I o%
S-50/35	35±5% or 35±2*2.5%	0.4	0.17	1.15	1.8
S-100/35			0.24	1.92	1.8
S-150/35			0.28	2.27	1.6
S-160/35			0.29	2.26	1.6
S-200/35			0.35	3.17	1.4
S-250/35			0.41	3.77	1.4
S-315/35			0.49	4.54	1.4
S-400/35			0.59	5.48	1.2
S-500/35			0.69	6.59	1.2
S-630/35			0.84	7.87	1
S-800-35			0.99	9.41	1
S1000/35			1.16	11.55	0.8
S-1250/35			1.41	13.94	0.8
S-1600/35			1.7	16.68	0.7
S-2000/35			2.18	18.39	0.6
S-2500/35			2.58	19.67	0.5

Technical parameter of S-800~ 31500/35 Series low-loss transformer

Type	HV	LV	Po kW	Pk75⁰C kW	I o%
S-800/35	35±5% or 38± 5%	3.15 6.3 10.5	0.17	1.15	1.8
S-1000/35			0.24	1.92	1.8
S-1250/35			0.28	2.27	1.6
S-1600/35			0.29	2.26	1.6
S-2000/35			0.35	3.17	1.4
S-2500/35			0.41	3.77	1.4
S-3150/35			0.49	4.54	1.4
S-4000/35			0.59	5.48	1.2
S-5000/35			0.69	6.59	1.2
S-6300/35			0.84	7.87	1
S-8000-35	35±22.5% or 38.5± 22.5%	3.15 3.3 6.3 6.3 6.6 10.5 11	0.99	9.41	1
S10000/35			1.16	11.55	0.8
S-12500/35			1.41	13.94	0.8
S-16000/35			1.7	16.68	0.7
S-20000/35			2.18	18.39	0.6
S-25000/35			2.58	19.67	0.5
S-31500/35

Amorphous Alloy core Type Transformer

Characteristics of Amorphous Alloy Core

Amorphous alloy is extremely thin. Only 0.03m thick permeability magnetic material. It is a new high-technology product with sheets made from molten steel, adopting ultra-paid cooling technology through a cooling drum. Iron core made of amorphous alloy has advantages of high saturation magnetic induction strength, low coercivity, low equivalent to silicon steel sheet 1/3NI/5, low exciting current, anticorrosion, good temperature stability and long service life. Amorphous alloy transformer, whose core material is made of amorphous metal, is a new energy-saving product. Compared with silicon steel transformers, the core of the amorphous alloy distribution transformer reduces over 70% iron loss during no-load loss. Extensive use is of great importance to energy conservation and environmental protection. The domestic demand of 10kVA. Manufacturing. If we all use the amorphous alloy annually, which can ease the intense supply situation in our country. At the same time, saving electric charge of power using units can improve iron g term economic benefits, promote strength during the market competition and development and technological advancement of our country’s transformer manufacturing industry.

Product Introduction

ZGSII Series combined type transformer is a new distribution equipment (commonly known as the American box substation). HV load witch, insert the fuse, and HV limiting current limiting fuse are installed in the transformer tank, with mineral oil for insulation and cooling. Its advantages include reasonable and compact structure, snail dimension, flexible installation, convenient operation, small occupation area, etc. The combined transformer is especially suitable for the load center of the city power grid, reducing the loss and improving the quality of the power supply. The combined transformer has widely been used for urban power networks in many developed countries. Currently, our country is reforming the urban and rural power grids. ZGSII series combined type transformer is undoubtedly the best distribution equipment for urban power networks.

Combined Transformer Series

Product Features

Small dimension, reasonable and compact structure, hermetically sealed tank, fully insulated design, safe and reliable operation, strong overloading ability to withstand sudden short circuit ring network and terminal power supply can be used. Convenient operation, reliable power supply saving energy, low loss, loss S is not higher than the new value excellent impact resistance performance. The cable terminals, which can switch on and off the circuit on load with a current up to 200A, have long mechanical and electrical laments.

Main Technical Parameters

Hv Load Switch Parameters

No.	Item	The second position	The fourth position
1.	Rated current	300A	300A
2.	Max. working voltage	15kV	15kV
3.	Lightening impulse level	95kV	95kV
4.	Power frequently withstands voltage in 1min	42kV,45kV(broken)	42kV,45kV(broken)
5.	Rated breaking current	300A	300A
6.	Short time withstand current	16kA	12.5kA
7.	Rated short circuit opening and closing times	40kA	31.5kA
8.	Max. operation torque	<40N.m	<40N.m
9.	Mechanical life	2000times	2000times
10.	Rated current breaking current	200times	200times
11.	Continuous working current	300A	300A

HV Cable terminal parameters

No.	Item	The second position	The fourth position
1.	Rated current	Kv	12
2.	Rated current	A	200,600
3.	Power frequently withstands voltage in 1min	kV	42
4.	Insulation Resistance	MΩ	2000
5.	Contacting resistance of contractor	uΩ	100

Fuse Parameters

Rated power kVA Rated Voltage 60kV Rated voltage 10kV

	Current Limiting Fuse	Plug-in fuse type	Current Limiting Fuse	Plug–in fuse type
100	50	C08	40	C06
160	80	C10	50	C08
200	80	C10	80	C10
250	125	C10	80	C10
315	150	C12	80	C10
400	150	C12	100	C11
500	175	C14	125	C12
630	175	C14	150	C12
800	200	C16	150	C14
1000	200	C16	200	C16

Transformer Parameter

Rated Power kVA	HvkV	Tapping Range	LVkV	Vector Group	PoW	Ok75^oCkW	Io%	Uk%
100			0.4	Dyn11	200	1500	1.3	4
160					290	2200	1.2
200					330	2600	1.1
250					400	3050	1.1
315	10				480	3650	0.9
400	10.5	±5% or 2*2.5%			570	4300	0.9
500	11				680	5150	0.9
630					810	6200	0.8	4.5
800					980	7500	0.7
1000					10300	10300	0.6

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