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The RET 541/543/545 transformer terminals bring reliability and better service to your distribution network and provide all the functions you need to protect and control your transformers. Their easy to use control panel and comprehensive communications and connec-tivity give you access to all the functions you need, whatever your application.
The RET 541/543/545 Transformer Termi-nals are designed for the protection, control, measurement and supervision of two-winding power transformers and power generatortransformer blocks in distribution networks. The terminals are loaded with functionality to suit your application. Besides the three-phase stabilized current differential function featuring 2nd and 5th harmonic restraint, the Basic version termi-nals incorporate three-phase overcurrent, non-directional earth-fault, restricted earth-fault, transformer thermal overload and phase unbalance protection.
The Multi version terminals further include overvoltage and undervoltage supervision, residual voltage and overexcitation protection, overfrequency and underfrequency protection, and underimpedance protection. Enhanced with an optional automatic voltage regulator function the terminal forms an integrated transformer management unit. A special Control version terminal with just voltage regulator and control functions is also available. |
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Multi-Winding Current Differential Protection
Use the SEL-387 Relay for protection, monitoring, and automation applications for important transformers, generators, and other power apparatus. Apply the SEL-387 Relay for protection of two-, three- or four-winding power transformers. Use overcurrent elements from combined CT inputs for backup protection. Use the thermal element to activate a control or issue a warning or alarm when the transformer overheats or is in danger of excessive insulation aging or loss of life. Capture current, hourly or daily, data about your transformer using the thermal event report. Perform predictive maintenance based on accumulated through-fault duty as compared to transformer capability as defined in ANSI Standard C57.109. Use recorded fault values or an alarm set point to initiate an evaluation of transformer maintenance needs. |
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| The DTP-B is a digital relay that provides high-speed differential and backup instantaneous differential three phase protection functions for power transformers. Different models of the DTP are available for protecting and monitoring transformers with two, three or four windings. |
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| The relays type SSG are intended for the protection against overloads, short circuits and earth faults in radial networks, ring mains or variable structure networks. |
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OMICRON's CT Analyzer is a unique lightweight electronic multifunctional instrument designed to meet the highest standards for performing excitation, ratio, polarity and winding resistance tests on current transformers (CTs) as well as burden-impedance measurement.
Benefits
* Extremly small and lightweight (< 8kg/17 lb), beneficial for on-site testing
* Reduced commissioning time due to fully automatic testing
* Allows testing and result assessment according to IEC 60044-1, IEC 60044-6 or IEEE C57.13 (ANSI standard)
* Accuracy level (0.02 %/1 min.) enables field calibration and verification of class 0.1 CTs for metering
* Testing of specialized CTs such as TPS, TPX, TPY and TPZ
* Automatic analysis of CTs with unknown data ("name plate guesser" function)
* Recalculation of test results after tests with different burden and different primary current (no further on-site measurements)
* High level of safety - all tests utilize low voltages (120V)
European Patent EP 1 398 644 A1
* Almost unlimited in: Ratio (50 000 : 1), Primary current (999 000A max.),
Knee point voltage (15kV max.)
* Automatic demagnetization of the CT after the test
* Data storage on a removable Compact Flash (CF) card, which can be read by any standard memory card reader
* Remote interface to integrate CT-Analyzer into an automatic production process
* Easy importing and editing into MS OfficeTM standard software |
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