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Wuhan Ultra High Voltage Power Technology Co., Ltd
Voltage Transformer Field Tester
NegotiableUpdate on 05/06
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Overview
The voltage transformer on-site tester is a high-precision electronic testing instrument specifically designed for fully automatic on-site detection of voltage transformer errors. As an important tool in the field of modern power system detection, it integrates modern electronic technology, computer technology, and high-speed communication technology to achieve fast and accurate detection of electromagnetic voltage transformers and capacitive voltage transformers.
Product Details
1、 Product Overview and Definition
The voltage transformer on-site tester is a high-precision electronic testing instrument specifically designed for fully automatic on-site detection of voltage transformer errors. As an important tool in the field of modern power system detection, it integrates modern electronic technology, computer technology, and high-speed communication technology to achieve fast and accurate detection of electromagnetic voltage transformers and capacitive voltage transformers.
Traditional voltage transformer calibration requires the configuration of bulky boosters, standard voltage transformers, load boxes, and voltage regulation control boxes, making on-site handling difficult, wiring complex, and low work efficiency. The emergence of on-site voltage transformer testers has changed this situation. A single device can complete error testing, ratio measurement, and secondary load testing, reducing on-site work intensity and improving detection efficiency.
This instrument is mainly used for laboratory and on-site testing of protective and metering voltage transformers. It has a wide testing range and can cover the testing needs of most voltage levels of transformers in the power system. Its intelligent, portable, and high-precision characteristics make it a professional equipment for power system operation and maintenance, equipment acceptance, and fault diagnosis.
2、 Technical principles and working methods
2.1 Core Measurement Principles
On the basis of traditional differential measurement method, innovative indirect measurement method theory is adopted. The instrument refers to the classic formula for voltage transformer error, and specifically establishes an effective mathematical calculation model for leakage reactance parameters that are difficult to measure directly. This technological breakthrough enables instruments to achieve high-precision measurements without the need for bulky boosters, standard voltage transformers, load boxes, and regulators.
The instrument integrates high-precision standard voltage transformers internally, which can accurately calibrate the errors of power voltage transformers at voltages of 1200V and 2400V. By using low-voltage extrapolation technology and advanced measurement circuits, the instrument can calculate the actual error of the voltage transformer under high voltage working conditions at lower test voltages. This technology greatly improves the safety and convenience of on-site testing.
2.2 Application of Advanced Technology
Off frequency power supply technology: Testing is carried out using off frequency power supplies that are close to the power frequency, effectively preventing on-site power frequency electromagnetic radiation and series interference, and improving the accuracy and stability of testing.
Universal platform technology: The instrument adopts modular design, decomposing complex functions into independent modules for collaborative work.
Digital signal processing technology: using a 16 bit ADC analog-to-digital converter to synchronously collect voltage, current, and phase signals, with high voltage resolution.
Simulation load technology: Through voltage simulation load technology, the load error of the voltage transformer under rated load and lower limit load conditions can be calculated. When calibrating the electromagnetic voltage transformer, an external voltage load box can be omitted.
3、 Main technical features and advantages
3.1 Highly integrated design
Traditional voltage transformer calibration requires multiple devices such as voltage boosters, standard voltage transformers, load boxes, and voltage regulation control boxes, with a total weight often exceeding several hundred kilograms, making on-site handling inconvenient. Modern voltage transformer field testers integrate all these functions into one device, weighing only 12-16 kilograms, truly achieving portable design.
This integrated design not only reduces the number of devices, but more importantly simplifies the wiring process. The instrument has a standard voltage transformer with the same transformation ratio as the measured voltage transformer, which can accurately measure the transformation ratio and no-load error of the measured voltage transformer, and then calculate the comprehensive error of the transformer based on the test results of impedance and admittance.
3.2 Intelligent operation experience
The instrument adopts a humanized human-computer interaction design, with a fully Chinese operating interface and wiring diagrams directly displayed on the screen, making on-site operations convenient. The intelligent operation experience is reflected in multiple aspects:
Automatic measurement function: The instrument can automatically complete the error measurement of measurement points, and the range automatically switches during the testing process without manual intervention.
Intelligent diagnostic function: It has the ability to intelligently determine the condition of external wiring, and can prompt for wiring errors, ratio errors, polarity errors, etc., effectively preventing equipment damage or testing errors caused by misoperation.
Data management function: The large-scale storage can store up to 1000 pieces of on-site test data, and some models even support storing millions of sets of data. The instrument is equipped with a USB interface, which can export test data to a USB flash drive. The accompanying data management software can be connected to the power system MIS software to achieve centralized management and analysis of data.
3.3 High reliability
In terms of anti-interference ability, the instrument adopts equipotential protection ring and fourth-order active low-pass filter technology, effectively shielding external power frequency and strong electromagnetic field interference.
4、 Core functions and testing capabilities
4.1 Testing Function
Error testing: capable of measuring the ratio error and phase error of voltage transformers, covering all regulatory points within the rated voltage range of 20% -120%. High testing accuracy, able to accurately determine whether the transformer is qualified.
Ratio measurement: Automatically measure the actual ratio of the voltage transformer and compare it with the rated ratio to determine if the ratio error is within the allowable range.
Polarity determination: Automatically determine the polarity relationship between the primary and secondary sides of the voltage transformer to ensure correct connection. When there is a polarity error, the instrument will immediately prompt to prevent measurement errors or equipment damage caused by wiring errors.
Secondary load test: Measure the actual load of the secondary circuit of the voltage transformer. This function is crucial for evaluating the performance of transformers under actual operating conditions.
Voltage current characteristic test: By measuring the voltage current characteristic curve of a voltage transformer, its core saturation characteristics and winding state can be evaluated, providing important basis for fault diagnosis.
5、 Product parameters:
UHV-915 Voltage Transformer Field Testertechnical indicators
| Variable ratio range | Full range measurement (electromagnetic type) ± 0.2% | |
| Error measurement range | Primary voltage: 3-110kV/√ 3 (non-standard primary voltage is also acceptable) | |
| Secondary voltage | 100V, 100V/√3, 6kV/100V 10kV/100v, 20kV/100V 35kV/100V, 6kV/√3/100V/√3, 10kV/√3/100V/√3, 20kV/√3/100V/√3, 35kV/√3/100V/√3, 66kV/√3/100V/√3, 110kV/√3/100V/√3 | |
| power factor | 0.0-1.0 | |
| Extreme error | ±0.05% | |
| DC resistance | 0.0-0.1Ω | ±3％ |
| 0.1-50Ω | ±1% | |
| PT secondary load | 1VA-500VA | ±2％ |
| Verification | voltage range | 0-100V （百分表.5%） |
| worse than | 0.001%-3% （100V） | |
| angle difference | 0.00′-50′（100V） | |
| error | △ X=± (2% × X+2% × Y ± 2 words) | |
| △ Y=± (2% × X+2% × Y ± 2 words) | ||
| admittance | 0.1mS-99.9mS | |
| error | △ X=± (2% × X+2% × Y ± 2 words) | |
| △ Y=± (2% × X+2% × Y ± 2 words) | ||
| working power supply | AC 220V ±10%/50Hz ±2% | |
| ambient temperature | 0－40℃ | |
| Total power consumption | 30W (static) 150W (working) | |
| ambient temperature | 0－40℃ | |
| ambient humidity | <85% at 25 ℃ | |
| Total weight | ≤6kg | |
| Whole machine volume | 37cm×28cm×16cm | |
Note:
1. The appearance of the product is subject to the actual product. Technical parameters and models are subject to change without prior notice. If there is any act of theft or copying, legal responsibility will be pursued.
2. For more information on ultra-high voltage products, please enter the product center.
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