Product Introduction

VOUCHIVAN supplied 4 units of 5000 kVA epoxy resin cast dry type transformer  to South Africa in 2022. 

The rated power of the dry type transformer is 5000 kVA, the primary voltage is 22 kV and secondary voltage is 6.6 kV with delta star connection. The 5000kVA transformers will each be supplying 3x compressors with 790kW motors which are started Direct-on-Line (D.O.L). The intention is for the 5000kVA transformer to accommodate 2x 790kW motors starting simultaneously D.O.L with the third starting some time after.The HV and LV cables are bottom entry, an 800 * 400mm opening is provided on the bottom of the enclosure for HV cable incoming, an 400*400mm opening is provided on the bottom of enclosure for LV cable incoming. Which is sealed with temporary low-carbon steel plate.The shock proof rubber pad is installed at the bottom of the transformer, which has excellent isolation effect and can reduce the impact of live load and seismic force on the transformer. There are three surge arresters installed on the enclosure and connected to the each phase of HV terminal.The transformer is equipped with no load tap changer, the tapping range is ±2*2.5% at primary side.The cooling is AN,but client is request to add additional fans，which means can add the capacity of transformer. The connect group is Dyn11. 

Cast resin technology provides excellent insulation and environmental protection, this together with the foil winding technology inside the resin offers the ultimate dry type transformer in terms of dielectric performance and short circuit withstand ability and ensures long term reliability for both distribution and special applications. cast resin transformers can be supplied with either aluminum or copper windings together with possibility of class F or class H insulation system, they can be designed to in-door or out-door installation with different enclosures.

We ensure that each one of our delivered units has undergone rigorous full acceptance testing. We provide one-package service from consulting, quoting, manufacturing, installation, commissioning, training to after sale services, our products are now operating in more than 50 counties in the world. We aim to be your most reliable supplier as well as your best partner in business!

Advantages

Fire resistant /Self-extinguishing(F1)

Environmental class(E2) and climatic class (C2)

From IP00-IP56 enclosure with AN, AF, ANAF or AFWF cooling

Maintenance free

Environmental friendly ,＞90% of material recyclable

Temperature control system

Built-in PT100 probes in 3 phase windings to detect the real-time temperature of windings and cycle display them in the digital screen.

Open circuit alarm and fault self-check alarm display and signal output.

3 stages automatically actions while the temperature reached to the set value, 1st stage the cooling fans start automatically, 2nd stage high temperature alarm,3rd stage over temperature trip.

Fans manual/auto control switch, timing start/stop, history data output.

4-20mA current output

RS485 Modbus communication protocol

Environment temperature measurement

Core temperature measurement

Scope of Supply

Product: resin cast dry type transformer

Voltage level: up to 35KV

Rating level: up to 20MVA

The transformer can be designed according to customer’s requirements

Technical Data Sheet

5000 KVA Dry Type Transformer specifications and data sheet

5000kVA-22/6.6kV Transformer Drawing

5000 kVA transformer diagram drawing and size.

5000kVA-22/6.6kV Transformer Manufacturing Process

Transformer Winding:

Transformer Enclosure

Finished 5000kVA-22/6.6kV Transformer

The epoxy resin dry type transformer has the characteristics of good electrical performance, strong lightning impact resistance, strong short-circuit resistance, small size, and light weight. The temperature display controller can be installed to display and control the operating temperature of the transformer windings to ensure the normal service life of the transformer.

Packing and Delivery

Installation Commissioning and Operation

Why Insulation resistance of dry type transformer decreased：

1.Reason analysis. Pouring type dry transformer winding is mostly made of resin pouring, conductor material is sealed in it, so the decrease of insulation resistance is mostly caused by moisture condensation on the surface of winding, dust accumulation or part of insulation material being affected by moisture.

2.Processing method： Clean winding surface, surface moisture condensation with dry cloth wipe, natural air can be restored. It can be dried by heater and ventilated by fan. The neutral line (zero row) of the three-phase connection of dry-type transformer can be disconnected. The megohm meter is used to determine which phase the problem is in, and then the problem is carefully searched and processed.

FAQ

1. Where is your main market?

We had exported our transformers to more than 50 countries in the world, our main market is Africa countries, South and North American countries, and Asia countries.

2. What certificate do you have?

We have KEMA, CESI, CTQC type test report for our transformers.

3. How long is your delivery time?

30 days after drawing confirmed by buyer for distribution transformers below 5000kva, bigger transformers depend on the capacity and components, normally 30-90days(with imported components)