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Low-Power InstrumentTransformer (LPIT)Technology for protectionand meteringsiemens-energy.com/gas-insulated-switchgearDescription BenefitsSiemens Energy LPITs are innovative voltage and current • Smaller size and weight of the GIS due to smaller dimen-transformers providing a safe, reliable and standardized sions of the sensors and their integration into a GISsolution for measurement and protection applications in GIS. partitionWithout saturation nor ferro-resonance phenomena, our LPIT • Easy connection and lower cabling and wiring effortprovides a digital signal output signal acc. to IEC 61850-9-2or can be plugged directly into a Siemens SIPROTEC 5 device. • High reliability and long lifetime expectance due to the robust design of the sensors in the cast resinThe LPIT combines a Low Power Voltage Transformer (LPVT) • Less insulation gas in the switchgearand a Low Power Current Transformer (LPCT) fully compliantto the IEC 61869 series of standards. • Excellent overvoltage performance - no need forThe measurement is based on Rogowski coils for current and disconnection during GIS or HV cable testscapacitive voltage sensors. Both sensors are integrated in the • No hazardous overvoltage at open terminalssame GIS cast resin partition
• A single LPIT covers all protection and metering require- ments and thanks to its linearity also a wide range of primary currents and voltages, simplifying stock management, engineering and logistics
• Flexible definition and modification of the settings for rated primary current and voltage in SIPROTEC at any phase of the project and afterwards. In this way the GIS remains flexible for future increases of nominal current
Furthermore, the LPIT sensors provide improved measure- ment performance due to high linearity, no saturation (unlike conventional CTs), no ferro-resonance effects (unlike conventional VT) and a wide frequency range for measuring harmonics up to the 50th harmonic frequency
Low-Power Instrument Transformer (LPIT)Merging unit Benefits • Minimize wiring by local installation (e.g. inside LCC)The SIPROTEC 6MU85 Merging Unit equipped with a dedi-cated Siemens Energy LPIT IO-card called IO240 provides a • Easy extension: simply connect a new device to thestandardized digital output to connect non-Siemens process bus and get instant access to the measuredprotection relays
valuesWhen using SIPROTEC5 relays the IO240 can be pluggeddirectly into the relay
• Maximum network reliability, through seamlessDifferential protection schemes using both LPITs andconventional CT are possible. redundancy protocols • Interoperability ensured, standardized inAdapts to your requirements IEC61869-9/-13 and IEC 61850-9-2• Digitalization of all primary data close to the process • Mixed installations with conventional and non-• Integrated IO240 for GIS LPIT sensors conventional CT/VT possible, e.g. for transformer• Connection of conventional CT & VT and other types of differential protection LPIT feasible too• Scalable number of binary inputs and outputs• Point on wave switching and phasor measurement integrated• Redundant power supply• Time synchronization via IEEE 1588, PPS or IRIG-B• Compliant to IEC 61869-9/-13 and IEC 61850-9-2• Full support of IEC 61850-8-1 GOOSE Merging Unit Siemens SIPROTEC 6MU85 flush mounted versionGeneral LPIT-145 (8DN8) LPIT-145 (8VN1) LPIT-170 (8DN8) Rated insulation level 145 / 275 / 650 kV 145 / 275 / 650 kV 170 / 325 / 750 kV Rated frequency fr 50 Hz / 60 Hz 50 Hz / 60 Hz 50 Hz / 60 Hz Rated short-time thermal current Ith 50 kA (3 s) 40 kA (3 s) 63 kA (3 s) Temperature range -30 °C / +55 °C -30 °C / +55 °C -30 °C / +55 °C Weight 100 kg 185 kg 185 kg Measurement of harmonics up to 50 50 50 Applied standard IEC 61869 IEC 61869 IEC 61869 LPCT Rated primary current Ipr 200 A 200 A 200 A Rated accuracy class 0.2S / 5P250 / 2TPM 0.2S / 5P200 / 2TPM 0.2S / 5P315 / 2TPM Rated extended primary current factor Kpcr 15.75 15.75 20 Rated symmetrical short-circuit current 250 200 315 factor Kssc LPVT Rated primary voltage Upr 66 to 138 / √3 kV 66 to 138 / √3 kV 66 to 154 / √3 kV Rated accuracy class LPCT 0.2 P 0.2 P 0.2 P Rated voltage factor FV and permissible 3 / 2000 h 3 / 2000 h 3 / 2000 h duration Low-Power Instrument Transformer (LPIT)Published bySiemens Energy Global GmbH & Co. KGFreyeslebenstraße 191058 ErlangenGermanyFor more information, please visit our website:siemens-energy.com/gas-insulated-switchgearor contact us:[email protected][email protected]© Siemens Energy, 2021Siemens Energy is a trademark licensed by Siemens AG
Subject to changes and errors. The information given in this document only contains generaldescriptions and/or performance features which may not always specifically reflect those described,or which may undergo modification in the course of further development of the products. Therequested performance features are binding only when they are expressly agreed upon in theconcluded contract. All product designations may be trademarks or product names of SiemensEnergy Global GmbH & Co. KG or other companies whose use by third parties for their own purposescould violate the rights of the owners
Conventional CT/VT possible, e.g. for transformer differential protection Low-Power Instrument Transformer (LPIT) Merging Unit Siemens SIPROTEC 6MU85 flush mounted version General …
Joint webinar of Siemens Energy and Siemens AG. Low Power Instrument Transformers LPITs are are innovative voltage and current transformers providing a safe, reliable and standardized solution for measurement and protection applications in GIS with improved measurement performance as well as smaller size and weight.
instrument transformers supplied by Trench for customers on all 5 continents every year. Electrical instrument transformers transform high currents and voltages to standardized low and easily measurable values that are isolated from the high voltage.
8VN1 Blue GIS up to 145 kV with Low Power Instrument Transformers (LPIT). The LPTIs enable a reduction of size and weight of up to 20 percent. The number of cruise ships in Norwegian waters is rising continuously. While only 100 ships berthed in the Port of Bergen in 1990, Bergen Havn expects this figure to rise to 300 in 2018.
While being a completely static electrical device, dry type low voltage distribution transformers are versatile to benefit your application. They convert alternating current from one voltage level to another to match the voltage supply to the electrical load.