A Computer-Controlled Calibrator for Instrument Transformer Test Sets

Siegenthaler, Stefan; Mester, Christian

doi:10.1109/tim.2017.2659858

Cited by 16 publications

(9 citation statements)

References 4 publications

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“…To vary the complex error, an error generator is required. The error generator emulates an instrument transformer with adjustable complex error in the dut channel [2]. The complex error is usually specified and displayed in terms of ratio error and phase displacement, as defined in iec 61869-1 [3].…”

Section: Introductionmentioning

confidence: 99%

Optimised calibration programmes for comparators for instrument transformers

Mester

2021

Tm - Technisches Messen

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Traditionally, instrument transformers are calibrated using bridges. By definition, bridges use the null method of measurement. The traditional calibration programme for instrument transformer bridges characterise namely this null measurement. Many new commercial comparators for instrument transformer use a very different method. They sample the secondary signals of reference and device under test (dut) transformer independently. Based on the samples, magnitude and phase of both signals are determined. Ratio error and phase displacement are calculated. Consequently, the significance of their calibration using the traditional calibration programme is limited. Moreover, the operating range of modern comparators is much larger than that of bridges. The additional versatility cannot be used without an adapted calibration programme. This article analyses the calibration programmes for both technologies. An experimental study confirms both the suitability of the new calibration programme and the need to chose the calibration programme depending on the technology of the device to be calibrated. The conclusion is very general and applies to all measurement problems where an operating principle is replaced by another – when changing the operating principle, it is important to check the calibration programme and adapt it if necessary.

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Section: Introductionmentioning

confidence: 99%

Optimised calibration programmes for comparators for instrument transformers

Mester

2021

Tm - Technisches Messen

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“…According to the Chinese national standards GB/T 26216.1-2019 [4] and GB/T 26217-2019 [5], the accuracy class of DC instrument transformers are 0.1, 0.2, 0.5, and 1, and the output signal types can be analog or digital in accordance with the international standard IEC 61869-9 (FT3) protocol [6]. A DC instrument transformer test set (ITTS), as an error measurement device for DC instrument transformers, generally adopts a direct measurement principle [7]- [9]. To evaluate the performance of a DC ITTS, regular error calibration is required to ensure its accuracy.…”

Section: Introductionmentioning

confidence: 99%

“…The standard error and standard digital protocol, which are the key standard parameters provided by a calibration device when calibrating the error measurement performance and digital channel performance of a ITTS, are the research focus of ITTS calibration technology. The standard error is achieved through the following schemes: 1) adjusted by signal sources and measured by auxiliary equipment [10], [11]; 2) adjusted by signal sources, voltage dividers or resistance-capacitance bridges [7], [12]- [15]; and 3) adjusted by program-based mathematical formulas [16], [17]. The standard digital protocol is achieved by 1) sampling with a digital multimeter or an A/D circuit [16], [17] or 2) utilizing a program-based protocol generator without sampling [10], [18].…”

Section: Introductionmentioning

confidence: 99%

Wide-Range Digital-Analog Mixed Calibration Technology of a DC Instrument Transformer Test Set

Nie²,

Xiong³

et al. 2021

IEEE Access

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A DC instrument transformer test set (ITTS), as an error measurement device for DC instrument transformers, needs to be calibrated regularly to ensure its accuracy. Existing calibration technology can only achieve DC ITTS error calibrations within a zero analog standard error. This paper proposes a wide-range digital-analog mixed calibration scheme for a DC ITTS based on multistage serial proportional micro-difference technology and high-speed high-precision sampling and coding technology, achieving a digital-analog standard error of ±1% that can be fine-tuned in 0.001% steps. A prototype is developed, and the prototype test results show that the expanded uncertainty of the prototype does not exceed 1×10 -4 , the maximum error of the standard error does not exceed ±3×10 -5 , and the output frequency of the digital protocol message is 4 kHz and 12.8 kHz. This scheme can achieve the error calibration of the analog and digital channels for the DC ITTS within a ±1% standard error and solve the error calibration problem of wide-range digital channels for DC ITTSs.

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“…Calibration of instrument current transformers (ICT) [1], [2], [3], [4], [5] at 50 Hz frequency is usually performed using a comparative method at layout according to Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

“…Secondary currents of a standard I2N and an ICT under test I2X are led to a system where the ratio error is evaluated as a deviation of the magnitude and the phase displacement as the phase shift of phasors I2X -I2N as shown in the phasor diagram in Eq. (1) and (2) or their simplifications are valid only at the assumption that errors of a standard are very small (eg. εIN ≤ 0.01 %) and when…”

Section: Introductionmentioning

confidence: 99%