MarsComp K-1000

MarsComp K-1000

Status: in development

MarsComp K-1000

Dual-channel comparator of voltage

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

Accuracy class: 0.02

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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.

 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

Via wireless dapters AR-1 and AR-1-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