~ WEG supplies new generation exciter generator to the Stadhuis, Belgium ~
The last thing a city needs is for its critical infrastructure to be affected by a power failure. That includes its city hall. That’s why E. Van Wingen, a leading Belgium based manufacturer of high-end engine-based power solutions, turned to WEG, to assist with a secure back-up power supply for the Stadhuis, Belgium.
A city hall is not only the chief administrative centre of any given metropolis but is also a symbol of local government. The Stadhuis of Antwerp, the capital city of Belgium’s Antwerp Province, therefore requires strict security protocols. In fact, the risks associated with Antwerp’s city hall is higher than many other government centres.
“The Stadhuis isn’t far from Antwerp harbour, which happens to be the second-largest petrochemical cluster in the world after the one located in Houston, Texas, US,” explained Werner Joosens, project manager at WEG Benelux. “A power blackout would not only result in an unhappy mayor and staff but, if caused by a malicious distributed denial of service (DDoS) attack, could pose significant risks.”
“Should the system ever be compromised, a crisis situation could ensue for the local resident petrol companies, and the harbour itself could then present a ‘ticking time bomb’,” continued Joosens. “While this is an extreme example, E. Van Wingen turned to WEG to help ensure the right power backup safeguards were in place.”
Backup supply
The electric motors in the basement of the Stadhuis are crucial in maintaining a secure power supply. A diesel engine drives the shaft of the building’s power generation. This is checked once a year to ensure it’s working and supplies 400 volts (V) that power the city hall’s computers and other systems.
E. Van Wingen fully-understood the criticality of the Stadhuis’ requirements. The company was enlisted in the project to supply its back-up power and, to do so, needed a trusted power equipment supplier like WEG.
WEG’s drives and motors are found in underground mining, hazardous oil and gas environments and classified area products. WEG’s relationship with E. Van Wingen began in 2015 by supplying asynchronous generators, before steadily progressing to orders for synchronous generators.
The Stadhuis required a synchronous motor. A synchronous motor literally operates in sync with the power supply. “Synchronous generators remain the most efficient electrical drive in industry,” explained Joosens. “They can be designed to operate effectively, and with great economy when converting mechanical power to electrical energy. They are also shown to reduce power costs and improve efficiency of the power system. In a few years, savings in power bills may equal the original investment of the generator.”
For the Stadhuis, however, WEG would go a step further. For the project, WEG supplied its new generation exciter generator equipped with high-intensity magnets for higher-quality power. The 135 kilo-volt-ampere (kVA) generator, type GTA251AIHD, has four poles so is capable of 1,500 rpm.
New exciter generator
The synchronous type GTA251AIHD generator uses a static exciter, designed with a slip ring motor with brushes — usually made from graphene or carbon to improve conductivity — for transferring power from DC supplied directly to the generator.
They are used in operations that require high performance and adaptability. This is particularly useful in industry sectors such as mining, steel, paper and cellulose, sanitation, oil and gas, cement, rubber and energy transmission. But what advantages would the system offer for the Stadhuis?
WEG’s new generation exciter generator had a lower initial cost, greater performance reliability and easier generator speed control. The generator can be used in applications requiring high starting torque or low starting current and, while these qualities are useful for heavy load inertia applications, for the Stadhuis they could be essential in instances when back-up power is required to kick-in.
Voltage regulator
WEG’s generators are equipped with an automatic voltage regulator (AVR). It automatically controls the generator voltage and keeps it constant when the rotating speed changes. The AVR is important in relation to cyber-attacks, as it helps to keep the power and the output stable against fluctuating generator speeds.
“Electronic voltage regulators are found in devices such as computer power supplies,” added Joosens. “Were anything to go wrong at the Stadhuis, the voltage would be stabilised, ensuring that the city hall’s computers can continue to run smoothly, without damage or failures caused by high voltages.”
The partnership between E. Van Wingen and WEG remains integral to this important symbol of Antwerp’s local government, protecting it from blackouts and cyberattacks — the last things any city needs.
