Power transformer 1600 kVA: not just “iron” at the substation 

This is what people often think about: tookpower transformer 1600 kva, installed, connected - and forgot. In fact, if you forget about regular maintenance, it will remind you of itself with unexpected breakdowns. The figure is solid, the power is decent, but it is at this power that all the nuances often emerge, which are somehow smoothed out at lower powers. Many people chase “top” brands, pay more, and then struggle for years with spare parts or adaptation to our networks. Or, on the contrary, they save on everything, including installation, and then are surprised by the buzzing and increased energy losses. I went through this myself, so I know that neglecting service and quality is an expensive pleasure.

From selection to arrival: where does the first “but” lie?

When a customer says “we need a 1600 transformer,” the first thing that comes to mind is what exactly is it for? To commission a new workshop? To replace an outdated one? A bunch of parameters forpower transformer 1600 kva: winding connection group, level of no-load and short circuit losses, even type of cooling system. Often, technical specifications are drawn up according to the old model, not taking into account that modern GOSTs and, more importantly, real operating conditions have already changed significantly.

Here, for example, is a story with one of our clients from the food industry. We ordered the device, everything was according to the standard. They delivered it, started installing it, and the space in the transformer chamber was designed with a minimum gap for ventilation. And the cooling system of the transformer is remote control, oil-air with blast. As a result, the noise from the fans had to be further muffled and the hood remodeled. Trifle? On paper - yes. There was a week of extra work and hassle on site.

Here it is important to work with a supplier who will not just sell a “box”, but will delve into the project. We are inWenzhou Qiaonasen Electrical Equipment Co.,LtdWe always request a floor plan and a one-line diagram. Sometimes we see that 1250 kVA would be enough for the customer with his load, but with a reserve, or vice versa, peak loads require special attention to overload capacity. This is the very solution for the task, and not for the number in the specification.

Installation and “first start-up”: theory versus practice

Unpacked and inspected. Everything seems to be intact. But the most critical point is checking the insulation resistance before adding oil (if the device was delivered without it) and after. Sometimes a transformer arrives and the megohmmeter shows excellent numbers. They poured in the oil, let it sit, and there was moisture. Or, when turned on for the first time, the gas protection on the Bacholz relay is triggered. This is not always a defect; often it is the consequences of transportation or storage.

One of the most instructive cases was with delivery to a construction site.Power transformer 1600 kVAstood on the open-air site for a month waiting for the building to be ready. Conservation was not carried out properly, rains, temperature changes. The result is prolonged drying in place and missed deadlines. Now we always insist: if storage is more than a week - special conditions, shelter, control.

The first turn on is always exciting. The click of a switch, a quiet hum... and it’s important to listen. A uniform hum is good. Crackling, uneven humming is bad. At the same time, we look at the readings of voltmeters and ammeters on all sides of the HV and LV. The voltage relationship must be clear. The slightest distortion is a reason to immediately turn it off and look for the cause, often in the incorrect connection of jumpers on the input box.

About oil and process chemistry

A separate issue is transformer oil. His quality and preparation decide half the success. You can’t just buy the first batch you come across and fill it up. Analysis is required: breakdown voltage, dielectric loss tangent, gas content. We collaborate with laboratories that provide a clear picture. It happened that the oil from the transformer manufacturer was ideal, but what was purchased locally for refilling was not. We had to filter and degas on site, which took time.

In progress: observations that you won’t find in your passport

After a year or two of operation, the character of the device is fully revealed. Reliablepower transformer 1600 kva- this is the one whose parameters are stable. We recommend that customers keep a simple log: oil temperature (especially in hot weather and peak loads), oil level, reactive and active energy meter readings. This helps to catch the moment when losses begin to increase, or a slight but constant overheat appears.

One of the common problems at such capacities is the influence of nonlinear loads. Modern production: frequency drives, arc furnaces, a large number of switching power supplies. They generate harmonics, which greatly heat the windings and core. A standard transformer without taking this factor into account will wear out. Sometimes the solution is to install filter compensating devices, sometimes the initial order of a transformer with reinforced insulation and designed for heating from higher harmonics.

Another point is vibration. It is always there, but over time it can intensify. If the fastenings to the foundation are loose or the foundation itself is shrinking, the hum becomes stronger and can lead to the weakening of the internal fastenings of the active part. Once every six months you just need to go up and put your hand on the tank. Strong vibration is a reason for an internal inspection.

When Things Go Wrong: Failure Analysis

It's unpleasant, but it happens. Classic - gas relay failure. Most often, this does not mean an instant breakdown. This is a consequence of slow processes: heating of the contact, oxidation, and local decomposition of the oil. The first step is the analysis of gases in oil (chromatography). By the ratio of gases (hydrogen, acetylene, methane, ethylene) you can accurately determine whether the oil is heating up, whether there is a glow discharge, or whether the cellulose insulation has begun to deteriorate. This saves you from unnecessary replacement of the entire unit.

There was an incident at one of the facilities where we supplied equipment.Power transformer 1600 kVAAfter three years of operation, the gas protection began to periodically trip. The customer panicked and prepared for a long and expensive repair. We insisted on mandatory oil analysis. It turned out that there was an increased content of acetylene and hydrogen, but in proportions indicating a low-energy arc discharge. We opened the device and found a loose contact on the tap switch. The problem was fixed in one business day. The main thing in such situations is not to ignore the first signals from the equipment.

Integration into the system and the role of the supplier

Today the transformer is not an island. This is part of the relay protection, automation, and metering system. It is important that its parameters (winding resistance, short-circuit currents) are correctly entered into the protection settings. Otherwise, you may get false alarms or, worse, failure to shut down in the event of an accident. We are on our websitewww.qnasen.ruWe always emphasize that our specialization is not just sales, but transmission and distribution solutions. This means that we can involve our relay protection specialists so that everything works as one mechanism.

The result of my experience with “thousand-sixes” is simple. Good choicepower transformer 1600 kvais a balance between price, workmanship and, critically, technical support. The device will serve for decades, and during this time questions will definitely arise. It’s much calmer when you know that there is a company like ours that remembers what it delivered and can quickly help with advice, diagnostics or the supply of spare parts. In the energy sector, the reliability of the “supplier-equipment-service” chain is often more important than a couple of percent of the efficiency indicated in the passport.