HML-LPIT

Mobile Laboratory for testing current and voltage electronic (low-power) transformers

① Automated (PC-controlled) source of test current MARS-AIT (Generating transformer + Variable-ratio transformer)

Output current range (depending of the modification):
0.5A…6000A
0.5A…3600A

Rated (nominal) currents available: 3000A and 5000A

②Automated (PC-controlled) source of test voltage MARS-AIN (Generating transformer + Variable-ratio transformer)

Output voltage range (depending on the modification):

340V…10√3 kV

340V…35√3 kV

340V…10√3 kV

③ Reference voltage transducer of CHVT series

Accuracy class options: 0.1 or 0.05

Rated primary voltage: 6, 10, 35, or 110 kV

④ Reference current transformer TTIP-5000 (accuracy class 0.05)

⑤ Comparator MarsComp K-1000 (accuracy class 0.02)

⑥Software E-TransfomerTest

Purpose

The Mobile Laboratory provides on-site automatic (or manual) testing and calibration of LPITs: current and/or voltage electronic (low-power) instrument transformers compliant with IEC 60044-8, IEC 61869-10, IEC 60044-7, and IEC 61869-11 standards. HML-LPIT makes it possible to test/calibrate LPITs of the following accuracy:

	Current LPITs of up to 0.2S class
	Voltage LPITs of up to 0.5 class

Sphere of application

	HML-LPIT is suitable for both on-site and laboratory testing
	Depending on the customer needs, HML-LPIT may include test sets for voltage, current, or combined LPITs controlled manually or automatically from a PC

Basic accuracy specifications

Accuracy class of reference current* or voltage** transformer	Permissible limits of measurement errors of HML-LPIT (when testing either current or voltage LPITs)
	Ratio error, %	Phase error, min	Composite error, %
0.05	0.056	3.32	0.12
* Range of current – 50 A…6 kA ** Range of voltage – 340 V…35, 110 kV

Basic components of the complete test set

Automated (PC-controlled) source of test current MARS-AS-I (Generating transformer + Variable-ratio transformer)

Automated (PC-controlled) source of test current MARS-AIT (Generating transformer + Variable-ratio transformer)

Output current range (depending of the modification):
0.5A…6000A
0.5A…3600A
Rated (nominal) currents available: 3000A and 5000A

Automated (PC-controlled) source of test voltage MARS-AS-U (Generating transformer + Variable-ratio transformer)

Automated (PC-controlled) source of test voltage MARS-AIN (Generating transformer + Variable-ratio transformer)

Output voltage range (depending on the modification):
340V…10√3 kV
340V…35√3 kV
340V…10√3 kV

Reference voltage transducer of CHVT series

Accuracy class options: 0.1 or 0.05
Rated primary voltage: 6, 10, 35, or 110 kV

Reference current transformer TTIP-5000

(accuracy class 0.05)

Comparator MarsComp K-1000

(accuracy class 0.02)

Software E-TransfomerTest