MarsComp K-1000

Dual-channel comparator of voltage

Reference comparator for calibration/verification of voltage and current LPITs (low-power instrument transformers) and conventional instrument voltage transformers

Purpose

Measurements:

	Transformer ratio/angle errors and phase shifts
	Values of voltage and current
	Voltage harmonics from 0.3th to 50th (15 to 2500 Hz) within the range from 0.08 to 840 V
	AC frequency within 15 to 2500 Hz

Application

1. Verification (accuracy check or determining ratio and angle errors) and calibration of:

	Low-power instrument voltage transformers (electronic voltage transformers, EVT) with analogue AC voltage output within the ratings from 20 mV to 8 V according to IEC 60044-7 test scheme
	Low-power instrument current transformers (electronic current transformers, ECT) with analogue AC voltage output within the ratings from 20 mV to 8 V according to IEC 60044-8 test scheme
	Conventional instrument voltage transformers (VT)
	Voltage dividers, scaling voltage converters

2. For instrument voltage transformers, investigation of their amplitude/phase to frequency curves as a response to application of voltage harmonics from 0.3th to 50th (15 to 2500 Hz) within the range from 0.08 to 840V. о 840 В

	Test systems accuracy testing and calibration of low-power instrument transformers (LPITs) and LPIT-compatible electronic energy meters
	Sets for testing LPITs
	Transformers to be tested

Accuracy characteristics

Measured values	Measurement ranges	Limits of permissible intrinsic measurement error
RMS of AC voltage, V	0,2 mV ... 840 V	Relative, % ±0.015 + ∆
AC frequency, Hz	15 ... 2500 Hz	Relative, % ±0.02
RMS of AC voltage for even and odd voltage harmonics of order h, h from 0.3 to 50 (from 15 Hz to 2.5 kHz), V	0,2 mV ... 840 V	Relative, % ±0.015 + ∆
Phase shift between the voltages of frequency f from the 2 channels	0 to 60 min	Absolute, min ±[1 + 0.02h]
	1 to 90°	Absolute, min ±10
Phase shift between voltage harmonics of order h from the 2 channels	0 to 60°	Absolute, min ±10
RMS of AC current	1 mA ... 6 A	Relative, % ±0.015 + ∆

∆ — additional error

Error (absolute)	Measurement ranges	Limits of permissible error
Current ratio error, %	–20.0 to +20.0	±0.015
Angle error, min	–180º to +180º	±1.0
Composite error, %	–20.0 to +20.0	±0.03

Error (absolute)	Measurement ranges	Limits of permissible error
Voltage ratio error, %	–20.0 to +20.0	±0.015
Angle error, min	–180º to +180º	±1.0
Composite error, %	–20.0 to +20.0	±0.03

Error (absolute)	Measurement ranges	Limits of permissible error
Voltage ratio error, %	±0.1999	±0.002
	±1.999	±0.02
	±19.99	±0.2
Angle error, min	±600 min	±0.1
Angle error, min	±180º	±1.0

General specifications

Mains power supply

220 ± 22 V, 47 ... 63 Hz

AC power consumption

50 VA, or less

Operating temperature range

+5 to +40 °C

Features

	One and the same instrument performs 2 functions: calibration/verification of both voltage and current transformers
	As reference transformers, together with MarsComp you can use conventional instrument transformers: CTs (1A, 5A) and VTs (100 V, 100/√3 V)
	Testing is possible if a VT (EVT) under test and a reference VT have different rated secondary voltages (different transformer ratios in other words)
	The manufacturer’s declared actual phase shift of the transformer can be monitored
	The instrument can be applied for certification of voltage transformers designed to measure voltage harmonics
	Measurement sub-ranges can be switched over either separately per each channel or altogether
	Communication with a PC starts automatically after self-testing, the program E-TransformerTest creates logs with measurement results
	Test reports are created automatically in the E-TransformerTest program

Design	Portable
Case	Case IP65 with handle
Communication ports	USB
Dimensions (L × W × H)	335 × 289 × 155 mm, or less
Weight	11 kg, or less

Design	Stationary (laboratory)
Case	19’’ DIN rail
Communication ports	USB
Dimensions (L × W × H)	485 × 450 × 140 mm, or less
Weight	10 kg, or less

Documentation

User Manual (1.55 Mb, pdf)

Reference comparator for calibration/verification of electronic low-power transformers of current and voltage (LPIT)

Accuracy class: 0.02

In 2023, Mars-Energo successfully supplied a set of equipment for the calibration of electronic low-power voltage transformers (LPIT) to the Republic of Korea. The set included two essential components:

1) Capacitive High-Voltage Transducer CHVT-220, accuracy class 0.05 at 220 kV/√3

2) Dual-channel Voltage Comparator MarsComp K-1000, accuracy class 0.01

The end user of this equipment is the research center of Hyundai company.

The calibration of the capacitive high-voltage transducer was conducted at Korea Research Institute of Standards and Science (KRISS).

The calibration report confirms that all metrological characteristics of the high-voltage transducer impeccably align with the customer's stringent technical requirements.