Weg soft-starters rescue national power system from natural disaster
When recent flooding in North Macedonia threatened the country’s supply of electricity, the company tasked with draining the mine, Simtech Solution, turned to Weg for support at a critical time.
Among the consequences of this natural disaster, which struck in August 2020, was the flooding of a coal mine beneath a thermal power plant managed by the state company ESM-North Macedonia.
More than 300,000 cubic metres of water had flooded the lower parts of the mine, effectively disabling all of its working operations. This had major ramifications, as ESM’s thermal power plant is an integral part of North Macedonia’s energy system. It supplies three-times 265 megawatts of power, generating 70 per cent of the country’s overall power requirements.
The mine had to be drained, quickly and effectively. Extra pressure was added by the coming winter season, as North Macedonians’ lives and wellbeing would depend on the plant’s ability to produce electricity from its processed coal.
With such high stakes, ESM turned to its trusted supplier and partner of more than 10 years, Simtech Solution, which specialises in devising automation and SCADA systems, and power distribution and management for environments including industrial automation, water treatment and more.
Even with its own years of experience, a natural disaster was a first for Simtech Solution. As Igor Novevski, projects and business development at Simtech explains: “There were several obstacles that had to be overcome if we were going to succeed. “We only had a couple of days for project planning to devise the technical solution and three weeks to execute the entire project. So, there was a very high pressure to complete the draining project on-time and a need for a quick response from all our project partners.”
This included the supply of several heavy-duty pumps sourced to pump all the sludge from the mine. Three 110 kilowatt (kW) pumps, by Tsurumi of Japan, and three 90 kW pumps, by Dragflow of Italy, were delivered by Tetra Dooel Bitola North Macedonia, the official local distributor for both types of pump. All were supplied with electrical equipment, but something else was needed: an effective start-stop control system.
Soft-starters would be essential for the fast, safe and reliable use of these pump motors – especially in a project as time-critical as the ESM plant drainage project. For this, Simtech Solution turned to its own trusted partner, Weg. Simtech Solution is an official distributor for Weg in North Macedonia.
“We have been working with Weg for many years now,” says Novevski. “Weg International Trade, Austria, has provided all kinds of equipment from its large stock in Germany. That was among the biggest reasons to go with Weg, their stock and quick response. They’re especially supportive in choosing systems that fit our technical requirements – we knew we could place our trust in Weg for this high-stakes project.”
Simtech Solution already had experience of Weg’s SSW06 Series soft-starter, designed to accelerate, decelerate and protect three phase induction motors. This time, it opted for the SSW900 soft-starter for its advanced performance capabilities.
The SSW900 is designed for energy savings, embedded protection and extended durability of electric motors. The equipment is fitted with a built-in bypass, which contributes to extending the starter lifetime, optimising the electrical installation and reducing heat dissipation.
Simtech Solution also opted for the SSW900 for its fault history and diagnosis capabilities, troubleshooting with date and time, and network communication interface. The SSW900’s compatibility with digital systems and human machine interfaces (HMIs) was also useful in light of ESM’s requirement to integrate several PT100 thermal protection probes during the project.
Not only was the ESM plant drainage project delivered on-time, it has also underlined the further SCADA advantages of Weg's soft-starters in response to this natural disaster. In this case, ESM-North Macedonia’s plant had a chance to re-examine its previous systems and make positive changes.
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