◆EDHG-III Chinese large liquid crystal intelligent transformer calibrator is a novel automatic testing instrument, which uses advanced electronic technology, the error signal of the transformer is directly extracted from the polar decomposition, and after appropriate calculation, the calibration point of the transformer, the in-phase error, quadrature error and the digital amount of the same time show up. The instrument is easy to operate, intuitive readings, rapid measurement, can reduce power consumption, reduce labor intensity; small size, light weight, easy to carry and on-site testing; the instrument can be in the 5% rated working current (voltage) under the test; such as the user requirements of the factory can also produce testing S-class current transformers and secondary voltage 100/3V voltage transformer calibrator, the instrument can be in the 1% rated working current (voltage) under the measurement of transformer error, the instrument can be in the 1% rated working current (voltage) under the measurement of transformer error. The instrument can measure the error of transformer under 1% rated current (voltage); during the testing process, the instrument can conveniently carry out self-calibration at any time in order to monitor the accuracy of the instrument; the key components are imported components with stable and reliable quality, which are widely used in the metrology, power supply and other departments and transformer manufacturers, and are the ideal instruments to carry out the testing of the transformer.
The EDHG-III Chinese large liquid crystal intelligent transformer calibrator is used to calibrate current and voltage transformers with accuracy levels from 0.01 to 10, rated secondary currents of 5A and 1A, and rated secondary voltages of 100V, 100/
V and 150V (100/3V and 220V). The measurement results are displayed directly on the digital display, and can be equipped with an RSC232 interface for users to conveniently connect to a computer.
Features
◆The instrument can measure the active and reactive components of the impedance or conductance of the secondary circuit of the transformer under test at any time during the calibration of the transformer.
◆When checking the transformer, the instrument can automatically indicate the polarity. When the polarity is wrong, the instrument can automatically cut off the differential current (differential pressure) circuit to ensure the safety of the instrument input circuit. It also sends out sound and light alarms to prompt the attention of the calibrator.
◆The instrument can be used as a right-angle coordinate system AC potentiometer to measure AC small current or AC small voltage.
◆The instrument can be used with isolation PT and operation box to measure the secondary voltage drop of voltage transformer.
◆When checking the transformer, the instrument can use standard current transformer or standard voltage transformer as the standard, or use double-stage current transformer, double-stage voltage transformer or induction voltage divider as the proportional standard.
◆The instrument can be used in the whole method or component method for periodic calibration.
◆Display method: 320×240 Chinese large liquid crystal screen.
◆Storage function: 40 groups of PT and CT data each, can store the error data of 1% point of CT;
◆Online function: can be connected with computer and corresponding software;
◆Printing function: real-time query printing;
Technical indicators
◆Measuring object: PT, CT, Y, Z
◆Operating range: current 1-1400V. ◆Working range: current 1-149% (Note: can school S-class transformer) voltage 5-149%
◆Measuring range:
◆In-phase component (%): 0.0001-19.99
Definition rate: 0.0001
◆Orthogonal component (min): 0.001-600
Resolution: 0.001
◆Resistance
Resistance (Ω): 0.0001-5.99
Resolution: 0.0001
◆Conductivity
Nano (ms): 0.0001-5.99
Resolution: 0.0001
◆Measurement error:
◆In-phase component: △X=±(X×2%＋Y×2%±2 words)
◆Orthogonal component: △Y=±(X×2%＋Y×2%±5 words)
"X", "Y" --- the display of the instrument
"2 words", "5 words"---quantization error of the instrument
◆Operating range:
◆Current: 1%-149% In(In=5A)
5%-199%
In(In=1A)
◆Voltage: 5%-149%
Un
(Un=100V, 150V, 100/√3V, 100/3V)