The service life and failure rate of machines and all elements of electrical equipment depend on the condition of the network, i.e. on its quality. The quality of the network has a significant impact on the amount of electricity consumed and also on the failure to comply with the contractual conditions of its distribution, which are associated with high fines. All of these are factors that cause unnecessarily higher operating costs and in some cases also major material damage. The term network quality is understood as compliance with the standard operating parameters of electrical energy, which are based on the standards and recommendations of manufacturers of machines and electrical equipment. The quality of the network is defined according to the STN EN 50160 standard, which defines and describes the characteristics of the supply voltage regarding frequency, magnitude, waveform and symmetry of extreme voltages.
Poor network quality can be caused by (sources of interference), for example:
- Induction and arc furnaces
- Electric traction
- Uneven phase load (single-phase load)
- Electrical semiconductor devices
- Rectifiers, frequency converters
- Thyristor controlled drives
- Generators
Poor network quality can, for example, cause (as a result of interference):
- Flickering of lights (flicker effect)
- Additional heating of transformers
- Line load
- Damage to sensitive equipment
- Terminal corrosion
- Malfunction of control devices and protective elements
- Additional losses on capacitors and rotating machines
- Additional noise from engines and other devices
- Additional active losses
- Reduction in equipment life
- The emergence of unwanted resonance phenomena in the network
- Increase in errors in measuring and control devices
By measuring network quality we can determine:
- Power supply frequency fluctuations
- Supply voltage size
- Supply voltage deviations
- Rapid voltage changes
- Supply voltage drops
- Short-term and long-term interruption of supply voltage
- Temporary and transient overvoltages at power frequency between working conductors and earth
- Supply voltage imbalance
- Harmonic and interharmonic voltages
- Voltage of signals in the network superimposed on the supply voltage
As part of our network quality measurement service, we offer:
- Inspection of wiring and electrical equipment
- Preparing a quote
- Performing network quality measurements using a network analyzer and other tools at designated points in the electrical network
- Processing and analysis of measured data
- Proposing solutions to eliminate identified problems
- Preparation of a measurement report
- Consultation with the customer
- Delivery and implementation of assembly or installation
