MarsComp K-1000

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

±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

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

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.