Do you want to know more about 34.5 kv transformers?

What is a 34.5kV transformer?

The 34.5KV value here is a transformer with a high-voltage input voltage of 34.5KV, including some common single-phase transformers, three-phase oil-immersed transformers, and dry-type transformers.The 34.5kv transformer has many specifications of capacity such as: 50kVA, 100kVA, 315kVA, 500kVA, 750kVA, 1000kVA, 1500kVA, 2000kVA, 2500kVA, 3000kVA, 4000kVA and 5000kVA.

You may be interested:  The Basic Guide of 500kVA Transformer

Is 34.5 kV medium voltage?

Yes, it belongs to the medium and low voltage classes. Here we are talking about the standard line voltage representation.

Learn more: The Ultimate Guide to Electric Transformer

What are the types of 34.5kv transformers?

In the power market, there are many types of 34.5kv transformers, such as 3-phase pad mounted transformer, single phase pad mounted transformer, cast resin dry type transformer, single pole mounted transformer, skid substation transformer, and distribution transformers.

Select voltage class and distribution point The networks a user can connect to depend on the type, size, and operational requirements of users' installation and requirements and features part of the distribution network involved. These choices are made by dealers based on the data listed below.

1. The size of the installation must be compatible with network operating standards. Generally speaking, Voltage curves, selectivity, and use of protection The finished line and transformer must be evaluated.

2. The location of surrounding loads in both layout's Current and planned networks.

3. Adjacent network characteristics.

4. Any generator contribution to short circuit Taking into account all the contributed power of the device

(generators, motors, etc.).

5. Introduced disturbance levels (rapid changes, harmonics, flicker, voltage asymmetry) by the load, Whether active or passive, it must be so Not exceed the level specified.

6. User requirements for service continuity.

7. The user's requirements for slow changes and voltage dips, Short circuit power, and voltage quality.

8. Develop the network to meet the above requirements. Connectable power indicator.

Read my article on 5+FAQ About 15kV Transformer

34.5kV Three Phase Pad Mounted Transformer

So here we mainly introduce the three-phase pad mounted-type transformers commonly used in the American market. To help you better understand what parameters and performance requirements are included in the transformer under 34.5KV voltage:

The transformer shall be three-phase, self-cooled, Liquid Filled Pad-Mounted, 65°C temperature rise rated OA, suitable for outdoor service.

The insulating fluid shall be vegetable-based with a 300 °C fire point. It shall be biodegradable.

The 34.5KV transformer shall be capable of rating continuous kVA at temperature rise and ambient conditions listed in the attached 34.5KV Data Sheet.

34.5KV Transformer primary winding shall be delta connected with four (4) 2.5% taps, two above and two below rated primary voltage. Tap changer shall be for de-energized operation.

The 34.5KV transformer shall be provided with a primary and secondary BIL as indicated in the  Data Sheets.

When specified in the  Data Sheets, the 34.5KV transformer secondary winding shall be wye connected with the secondary neutral brought out for connection to a grounding resistor. In all other cases, the transformer neutral shall be solidly grounded.

Each 34.5KV transformer shall have an impedance.

Each 34.5KV transformer is to have provisions for the future addition of fans to achieve an OA/FA rating.

A flange shall be provided on the end wall of the tank for attachment to the incoming line compartment. The flange shall be located on the left when facing the front of the transformer.

A flange shall be provided on the end wall, opposite the high-voltage flange, for attachment to the low-voltage air-filled terminal compartment.

Read more: 3 Phase Pad Mounted Transformer-Daelim Belefic

34.5kV Three Phase Pad Mounted Transformer Accessories

Accessories shall include: 

Provision for lifting, jacking, and rolling.

Stainless Steel diagrammatic nameplate.

Suitable bolted hand-hole cover

Upper filter press connection, threaded cap, or valve.

Magnetic liquid level gauge with alarm contacts (71).

Combination drains the Bottom Filter /Press Connection valve with the sampler.

Pressure relief device.

Dial type thermometer (26T) with two over-temperature alarm contacts.

Vacuum/pressure gauge.

NEMA ground pads (two minimum on opposite ends), copper faced, with drilled and

tapped holes for purchaser's connection of ground lead. The vendor shall provide terminals for the connection of the customer’s ground cables.

Keep reading: What are the standard accessories for a Pad-mounted Transformer?

34.5KV Transformers to be Core Form Construction provided with Copper /aluminum windings.

Insulation Class for resistive temperature rises to be defined transformers are to be provided with an Automatic Gas Seal system complete with regulators, gauges, manifolds, etc.

34.5KV Transformers shall be capable of operating above-rated voltage or below-rated frequency Transformers shall be designed and constructed to be completely self-protected by their ability to withstand the external short circuits as defined.

34.5kV Transformers shall be furnished with non-corrosive diagrammatic nameplates permanently attached with non-corrosive hardware. The nameplate shall include the name of the manufacturer, the location of the manufacturer, and the testing performed.

Try for free: Pad Mounted Transformer

34.5kV Three Phase Pad Mounted Transformer Factory Tests

So what transformer factory tests will be included?

Resistance measurements.

Ratio tests.

Polarity and phase-relation tests.

No-load loss and excitation current.

Impedance and load loss.

Applied potential tests.

Induced potential tests.

Tank leak tests.

Dielectric tests.

Impedance Voltage Test

Impulse Test

Get it now: How to test a power transformer?

At the same time, The LV section shall consist of a full-height air-filled terminal compartment, closely coupled to the 34.5KV transformer.

Compression lugs shall be provided.

Clamp-type terminals shall be provided for ground cables.

Bushings shall be wall-mounted porcelain with a copper conductor.

And for more on 34.5kV transformer Drawings :

The manufacturer of each transformer design shall submit drawings for review and approval by the engineering department before the Corporation purchases items. The drawings shall detail dimensions, weights, and nameplate data.

Guarantees: The manufacturer shall guarantee that the transformer(s) supplied shall be in accordance with all requirements of

this specification and shall supply factory test data to support this.

Try for free: 34.5 kV 50 MVA Transformer

34.5kV 3 Phase Pad Mounted Transformer 

Transformer Losses & Efficiency

The manufacturer shall provide the following power loss information for each size and design:

1. Core loss at no load in watts at 105% load and rated voltage, corrected to 85°C.
2. Load loss (Copper) in watts, corrected to 85°C under full load conditions.

Shipping & Storage Requirements

All 34.5kV transformer units shall:

• Be shipped on pallets, securely strapped down by their lifting hooks, with all cabinet doors closed for marine shipment.
• The pallets must be suitable for lifting with forklift equipment and ensure no part of the unit hangs over the pallet area.

Compliance

34.5kV Transformers shall comply with the latest revision of ANSI C57.12.26, except where it conflicts with specific requirements of these specifications. All ANSI standards referenced in the specifications are the latest revisions.

Transformer Specifications

• The transformer shall be three-phase, pad-mounted distribution type, 60 hertz, liquid-immersed, self-cooled, and suitable for outdoor service.
• Rated at 34,500 volts, 60 hertz, and 150 kV BIL.
• It shall have two 2½% taps above and below rated high voltage, with an average winding rise not exceeding 65 degrees Celsius.
• Primary connections shall be arranged for loop feed, with six primary bushing wells suitable for 600-ampere load break bushing inserts.
• Secondary configuration shall include three insulated bushings with one grounded secondary neutral bushing, featuring spade-type terminals with NEMA standard twelve (12) hole spacing.
• The transformer shall be Delta/WYE connected, with internal grounding of the primary neutral, and designed to avoid tank heating due to third harmonics.

Additional Features

• Equipped with a parking stand for each primary bushing, three primary liquid-immersed fault-sensing expulsion type load break fuses in series with internal current-limiting fuses, and provisions for hot stick removal.
• Includes a pressure-vacuum gauge and pressure relief device, with the tank constructed to withstand a minimum of 12 psig with rupture.

Design Details

• The transformer shall be the dead-front primary type with separate high- and low-voltage compartments, the high-voltage compartment fastened from inside the low-voltage compartment.
• Low-voltage compartment shall have provisions for padlocking, installation without a fence or protective enclosure.
• Complete nameplate inside and outside the low-voltage compartment, external tap changer handle (if applicable), provision for tank grounding, and bolting to a foundation pad.
• Conforms to ANSI Standard C57.12.22, except where it conflicts with specific requirements outlined.

Read more: DOE Efficiency Standards for Transformers

What are the standard sizes of 34.5kV transformer?

Here we still introduce the size of the pad mount transformer for a better understanding. Here our engineers will design according to the American standard and the actual installation environment of the user. Here you can refer to a 34.5KV 2500kVA pad-mounted transformer outline drawing for a more intuitive image. To the height depth and width of the transformer and the dimensions of some interior fittings.

The size of the 34.5kv transformer is also different for different capacities. The larger the capacity of the transformer, the larger the size, the heavier the weight, and the higher the price.

Reading more: 8+FAQ About Pad Mounted Transformers

34.5kV Transformer For Sale

Daelim is a professional pad-mounted transformer manufacturer in China, with rich experience in overseas transformer design, production, and export. Therefore, 34.5kv transformers can be customized according to your needs and technical requirements. It is also one of the few transformer manufacturers in China with UL listing and certificates. 34.5kV transformers are sold to America, Canada, and many other North American countries

Try for free: How To Purchase 3000kVA Transformer In USA & Canada?

The maximum capacity of 34.5kV pad-mounted transformers produced by Daelim can reach 10MVA, and your special technical requirements can also be met. Because Daelim has designed, produced, and sold many special transformers.

The production time of the Daelim transformer is about 6-8 weeks, with the ability of fast delivery, and the price is also competitive. With SGS, UL, cUL, CSA, ISO, and other certificates. There are many transformer project cases in North American markets such as the United States and Canada. Cooperate with internationally famous brands Eaton, Amazon, and other customers. If you have a transformer project, contact Daelim to provide you with the best production plan, perfect solution, and detailed price list.