Low Power Instrument Transformer Lpit Siemens

Low power instrument transformer lpit siemens

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Low-Power Instrument
Transformer (LPIT)
Technology for protection
and metering
Description Benefits
Siemens 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 GIS
solution for measurement and protection applications in GIS. partition
Without saturation nor ferro-resonance phenomena, our LPIT
• Easy connection and lower cabling and wiring effort
provides a digital signal output signal acc. to IEC 61850-9-2
or 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 resin
The LPIT combines a Low Power Voltage Transformer (LPVT) • Less insulation gas in the switchgear
and a Low Power Current Transformer (LPCT) fully compliant
to the IEC 61869 series of standards. • Excellent overvoltage performance - no need for
The measurement is based on Rogowski coils for current and disconnection during GIS or HV cable tests
capacitive voltage sensors. Both sensors are integrated in the • No hazardous overvoltage at open terminals
same 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 the
standardized digital output to connect non-Siemens
process bus and get instant access to the measured
protection relays

When using SIPROTEC5 relays the IO240 can be plugged
directly into the relay

• Maximum network reliability, through seamless
Differential protection schemes using both LPITs and
conventional CT are possible. redundancy protocols
• Interoperability ensured, standardized in
Adapts 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
• 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
flush mounted version
General 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
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
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
Low-Power Instrument Transformer (LPIT)
Published by
Siemens Energy Global GmbH & Co. KG
Freyeslebenstraße 1
91058 Erlangen
For more information, please visit our website:
or contact us:
[email protected]
[email protected]
© Siemens Energy, 2021
Siemens Energy is a trademark licensed by Siemens AG

Subject to changes and errors. The information given in this document only contains general
descriptions 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. The
requested performance features are binding only when they are expressly agreed upon in the
concluded contract. All product designations may be trademarks or product names of Siemens
Energy Global GmbH & Co. KG or other companies whose use by third parties for their own purposes
could 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 …

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Frequently Asked Questions

What is the low power transformers and transformers?

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.

What is an instrument transformer?

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.

What does lpit stand for?

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.

What is a dry type low voltage distribution transformer?

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.