Transformer monitoring

The importance of power transformer that needs to receive grid power supply and transform it to a useful voltage level can not be emphasized enough. Transformers belong to one of the most critical equipment that has to maintain continuous power supply in order for production to operate. In case such an equipment fails, the loss of power supply to consumers means critical breakdown. Having equipment reliability data helps with an assessment of the overall reliability of an electric system and in combination with the analysis of past failure data, future failure behavior can be reduced.


Transformer monitoring system (TMS) is built with a clear goal - to help its users improve asset management and prevent critical equipment from unplanned shutdowns. With over 450 systems installed around the globe, the TMS system sets the standards in transformer monitoring.

 

Transformer monitoring system is object oriented system (SCADA system – process-oriented system). It provides insight in the state of a transformer and its real-time service conditions. The system uses several key functions such as:

- Measurement of quantities
- Estimations based on measured values and transformer data (algorithms)
- Comparison of current and initial values (trends)
- Comparison of current values with those obtained from a model (model monitoring)

 

 

The worldwide transformer reliability survey conducted by CIGRE WG A2.37 and published in Brochure no. 642, collected and analyzed 964 major failures which occurred in the period 1996 to 2010, within a total population of 167,459 transformer-years, contributed by 58 utilities from 21 countries. The results point out the main causes of transformer failures, including the reasons with most severe results such as fire or explosion. it was concluded that failures were predominantly winding (40%) and tap changer (27%), while MV and LV bushings, lead exits and core showed smaller contribution levels. As seen from the survey results HV Bushings significantly also contribute to large failures, which means that operators should place large focus on bushing monitoring.

Many recent studies have shown that bushing failure is one of the most common causes of transformer failure. Thus the need for bushing diagnostic and monitoring system has risen. Although the offline diagnostic gives more accurate and precise insight into the bushing insulation state, it is still not common practice for substation maintenance to perform such tests very often. The main reason is that it demands transformer outage, well trained personnel and expensive equipment.

Koncar TMS bushing monitoring provides insight into the bushing insulation state while the transformer is online. A developing fault inside the bushing can now be detected in the early stages so proper action can be taken to save substation equipment and personnel. Powerful digital signal processor module enables precise measurement of bushing leakage current amplitude and phase angle. By measuring those parameters, relative dissipation factor (△ tan δ) change and relative capacitance change (△C/C0 ) can be calculated.

Key features:

  • Bushing capacitance and tanδ monitoring
  • Bushing adapters for various tap design
  • Voltage RMS, Peak measurement
  • Overvoltage detection
  • Frequency and phase measurements

Three types of bushing methods to choose from:

VT reference method; Dual transformer method; Sum of currents methods                                          

 

 

TMS MINI:

  • For medium sized transmission and distribution power transformers
  • Monitoring scope includes: HV Bushings; Active part (gas and moisture in oil, thermal model, paper insulation)

TMS STANDARD:

  • For Large power and Generator Step-up Unit transformers
  • Monitoring scope includes: TMS mini,  MV and LV bushings, Partial discharges, OLTC,  Cooling system

TMS PLUS:

  • For HV and UHV transmission S/s
  • Monitoring scope includes: TMS standard, transient overvoltages

TMS is equipped with advanced tools that allow quicker and more effective data management

  • Trend analysis - allows data selection from past periods and comparisson of data in a single graph
  • Alarms and events logging - list of all situations when problems occured with more information
  • Loading forecast - a tool that enables estimation of a possible transformer overloading, depending on a current transformer state and overloading needs.
  • Data export to text and Microsoft Excel - the information can easily be shared and additionally analyzed
  • Automatic report generation - creation of specific reports for target people based on their area of interest

In order to target the biggest issues of transformers and help customers choose appropriate TMS option, we also offer the following services

  • Consulting services on how to select the optimal monitoring system for a new or or an in service transformer
  • Installation and commissioning
  • Staff training
  • Recommendation of limit values (alarms) settings
  • Expertise in interpretation of the acquired monitoring results




Send No, thanks

 

Solution benefits 

Fault detection

Monitoring and diagnostic for all vital transformer parts
Prevention of failures and unplanned outages
User defined alarm limit and gradient setting

 

Modularity

Applicable to all types of power transformers and shunt reactors
Fits new or existing transformers from any manufacturer

 

Condition based maintenace

Optimization of transformer performance
Improved asset management using overloading and lifetime expectancy estimations
Integration of data for root cause analysis

 

Expert functions

Advanced trending analysis tools
Interpretation methods of fault gas analysis according to relevant IEC and IEEE standards
Long term data archive with event logging
Automatically generated reports for stakeholders

 

Next steps

See for yourself why TMS is the right solution for you by choosing one of the options below or simply contact us.

Download brochure  Demo request

References

TMS is successfully monitoring over 450 transformers over the globe including some of our selected references shown below.

  • Krško, Slovenia


    NEK - Nuclear power plant

    TMS installed on 2 transformers with 500 MVA capacity

  • Prunéřov, Czech Republick


    CEZ Group - thermal power plant

    TMS installed on 7 transformers with 430 MVA capacity

  • Zelenchuckskaya, Russia


    Rushydro - Hydropower plant

    TMS installed on 2 transformers with 400 MVA capacity

  • US Steel, Slovakia


    US Steel, Košice

    TMS installed on 2 transformers with 500 MVA capacity

  • ​Lemašany, Slovakia


    SEPS - power distribution

    Substation 400/220/110 kV

    TMS installed on 2 transformers with 700 MVA capacity

  • ​Ras Laffan C, Qatar


    Ras Girtas Power Company

    Total capacity: 2.730 MW

    63 mil. gallons per day prodcued

    TMS installed on 16 transformers with 6 GVA capacity