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35 kV 3-phase Pad-mounted Transformer

Brand: WISHPOWER
Standard: GB/T10228-1997、GB6450-1986、IEC726
Factory Price Pad Mounted Transformers
Vector Group: Yyn0, Dyn11
Insulation Level: LI75AC35/AC3 LI170AC70/AC3

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DESCRIPTION

Specification

Primary Voltage (V)	33000
Model	TR D3SP-15-33000-220y/127	TR D3SP-30-33000-220y/127	TR D3SP-45-33000-220y/127	TR D3SP-75-33000-220y/127	TR D3SP-112.5-33000-220y/127	TR D3SP-150-33000-220y/127	TR D3SP-225-33000-220y/127	TR D3SP-225-33000-220y/127	TR D3SP-300-33000-220y/127
KVA Rating	15	30	45	75	112.5	150	225	300	500
No-Load Loss (W)	90	126	170	240	315	360	520	660	1050
Full Load Loss at 85°C (W)	236	433	603	917	1273	1600	2402	3063	4481
Total Losses at a load factor of 80% (W)	241	403	556	827	1130	1384	2057	2620	3918
80% load for distribution transformers (Efficiency in % at 85°C)	98.03	98.35	98.48	98.64	98.76	98.86	98.87	98.92	99.03
Impedance (85°C)	2.0~4.0	2.0~4.0	2.0~4.0	2.0~4.0	2.0~4.0	2.0~4.0	2.0~4.0	2.0~4.0	2.0~4.0
Oil Weight (L)	520	520	530	555	560	610	610	630	650
Total Weight (KG)	1500	1530	1560	1580	1750	1850	2180	2500	3100
Dimension (mm) A	2050	2050	2050	2050	2050	2050	2050	2050	2050
B	830	830	830	830	840	850	880	880	930
ØD	820	820	820	820	820	820	820	820	820
H	1900	1900	1900	1900	1900	1900	1900	1900	1900
Winding Material	AL-AL	AL-AL	AL-AL	AL-AL	AL-CU	AL-CU	AL-CU	AL-CU	AL-CU

If you are interested in our transformers and related transformer accessories, please get more information and professional solutions through this website or directly through info@wishpower.net

What is the 35 kV 3-phase Pad-mounted Transformer?

The 35 kV 3-phase pad-mounted transformer is an electrical transformer installed outdoors in medium voltage distribution networks. The transformer is rated for 35 kV on the high voltage side, configured for three-phase electrical distribution systems which are used extensively by the utility, industrial, and commercial in the distribution of power. However, the pad-mounted design provides that the transformer is housed in a tamper-resistant and weatherproof steel cabinet capable of ground-level installation on concrete pads in residential neighborhoods, commercial complexes, and industrial facilities. It is compact and closed in structure, avoiding accidental touch with live components, as well as environmental conditions such as moisture, dust, and high temperature. Specifically configured, the transformer may also include load tap changers and fused protection devices to enhance operational flexibility and safety.

Transformer life

According to the instruction manual, the transformer is installed and put in maintenance when the working conditions and load conditions are specified. It should be expected to live a life of at least 40 years.

The operating life of the main components (no normal maintenance except pre-test during the operating life) requires:

a) Capacitor bushing: 30 years and above;
b) Bushing transformer: 30 years and above;
c) Radiator: 30 years and above;
d) Oil storage cabinet: 30 years and above;
e) Desiccant: 30 years and above;
f) Seals and diaphragm capsules: 30 years and above;
g) Pressure relief valve and gas relay: 30 years and above;
h) Closing times of various valves: More than 100 times leakage-free at an oil temperature of 105℃
i) Terminal box: 30 years and above;
j) Measuring instruments such as thermometers and oil level gauges: 15 years and above.

Maintenance

Visual Inspections

Visual inspections done regularly (e.g. every few months) serve to highlight an oil leak, rust, or damage located in the cabinet. External surfaces should be cleaned to keep dirt and debris from interfering with ventilation or operation.

Oil Sampling and Analysis

Periodic oil testing is needed to determine the oil’s dielectric strength and determine if the oil is contaminated or full of moisture. DGA (Dissolved Gas Analysis) can also be done to monitor for early indication of internal faults.

Testing Electrical Components

If the load tap changers, bushings, and terminals are not properly inspected and tested their reliability for electrical performance would be questionable. These resistivity and insulation tests are used to determine which parts are deteriorating.

Cooling System Maintenance

In the case of radiators, retake a cleaning of the radiator and also, if applicable, the fans.

Grounding System Check

Great electrical fault protection depends on the grounding system, which should be periodically tested for continuity and low resistance between each element of the system.

Replacement of Worn Parts

Even if they’re good enough, worn components, such as gaskets, seals, or fuses should be replaced as soon as possible to avoid operational problems.

Periodic Load Monitoring

By spending time keeping an eye on the thyroid of the transformer as it steadily heats up and then cools down, you will ensure that the transformer does not overheat and overload as it is expected to do.

Certificate

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