Publish Time: 2024-06-13 Origin: Site
This system adopts a dual-channel digital sampling method, which can refer to the calibration procedures outlined in JJG 1177-2021 to meet the requirements for ratio error, phase displacement, and harmonic performance of voltage transformers in the wide frequency range of 10 kV, 50 Hz to 3 kHz. Similarly, it can refer to JJG 1176-2021 calibration procedures to fulfill the requirements for ratio error, phase displacement, and harmonic performance of large current transformers in the wide frequency range of 600 A, 50 Hz to 3 kHz. These procedures are intended for evaluating the performance and accuracy testing of high-voltage and high-current measuring devices used in power systems rated at 0.1 class and below.
Table 1 Test Items That Can Be Completed by The Test System
Power Frequency Output/Measurement | Harmonic Function | Remarks | |
JJG 1177-2021 | • Fundamental error measurement • Stability test | • Measurement of fundamental wave superimposed harmonic error | • Fundamental wave 50 Hz, • Highest harmonic 50th |
JJG 1176-2021 | • Fundamental error measurement • Stability test • Magnetic saturation margin test | • Single harmonic error measurement | • Fundamental wave 50 Hz, • When the highest harmonic is 50th, the harmonic current accounts for >10% |
Test System | • Basic error measurement • Stability test • Operation variation test • Magnetic saturation margin test | • Single harmonic error measurement • Single/multiple harmonic superposition measurement | • Frequency 50 Hz～3 kHz, • Supports 2nd to 50th harmonics • Harmonic current ratio >10% at 50th |
Harmonic Voltage Transformer Test System | |
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1. Wideband Source Cabinet | 2. Signal source: Signal generation, output settings |
3. Power amplifier: Amplifies voltage signals | |
4. Step-up Transformer | Step-up output, up to 12 kV |
5. Transformer Under Test | Capable of testing 0–10 kV, 50 Hz–3 kHz |
6. Voltage ratio standard (class 0.02) | Including 10 kV, 1 kV, and 200 V specifications, 50 Hz–3 kHz |
7. Metering Cabinet | 8. Calibrator (class 0.02): Dual channel, 50 Hz ~ 3kHz |
9. Voltage divider: 100:5 voltage divider ratio | |
Note: The above constitutes a single set of voltage transformer testing system accessories. If a complete set of voltage/current transformer testing systems is assembled, the signal generator component in the signal source cabinet can be shared. When voltage and current transformers are not being tested simultaneously, the power amplifier component in the signal source cabinet can also be shared. | |
Harmonic Current Transformer Test System | |
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1. Wideband Source Cabinet | 2.Signal source: Signal generation, output settings |
3. Power amplifier: Amplifies current signals | |
4. Current Booster | Step-up output, up to 600 A |
5. Transformer Under Test | Capable of testing 0 ~ 600A, 50 Hz–3 kHz |
6. Current ratio standard (class 0.02) | Including 600 A, 100A, 20 A, 5 A specifications, 50 Hz–3 kHz |
7. Metering Cabinet | 8. Calibrator (class 0.02): Dual channel, 50 Hz ~ 3kHz |
9. Shunt: I/V conversion | |
Note: The above constitutes a single set of current transformers testing system accessories. If a complete set of voltage/current transformer testing systems is assembled, the signal generator component in the signal source cabinet can be shared. When voltage and current transformers are not being tested simultaneously, the power amplifier component in the signal source cabinet can also be shared. | |
The Application of Harmonic Voltage Transformer Testing System |
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• Test Items: Fundamental error, single harmonic error, fundamental superimposed harmonic error, multiple superimposed harmonic error • The harmonic voltage transformer is tested using a dual-channel digital sampling method. • Wideband voltage source: 0–10 kV, fundamental frequency: 50 Hz / 60 Hz, with the ability to set 2nd–50th harmonic overlays. • Testing software: Users can customize testing protocols, including basic error measurement, stability tests, operational deviation tests, magnetic saturation tests, single harmonic tests, fundamental wave superimposed harmonic tests, etc., to achieve automatic testing of the measurement performance of harmonic voltage transformers. |
The Application of Harmonic Current Transformer Testing System |
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• Test Items: Fundamental error, single harmonic error, fundamental superimposed harmonic error, multiple superimposed harmonic error • The harmonic current transformer is tested using a dual-channel digital sampling method. • Wideband current source: 0–600 A, fundamental frequency: 50 Hz / 60 Hz, with the ability to set 2nd–50th harmonic overlays. • Testing software: Users can customize testing protocols, including basic error measurement, stability tests, operational deviation tests, magnetic saturation tests, single harmonic tests, fundamental wave superimposed harmonic tests, etc., to achieve automatic testing of the measurement performance of harmonic current transformers. |
Dimensions | Single Cabinet | 800 mm(W) x 800 mm(D) x 2100 mm(H) |
System footprint | 6000 mm(L) x 2200 mm(W) | |
Recommended Laboratory Area | 7500 mm(L) x 5000 mm(W) |
Power Supply | Signal Source Cabinet | Three-phase five-wire system, AC 380 V ± 38 V, 50 Hz ± 2 Hz, ≤16 A |
Measurement Cabinet | Single-phase, AC 220 V ± 22 V, 50 Hz ± 2 Hz | |
Other Supporting Equipment, Computers, Printers, etc. | Single-phase, AC 220 V ± 22 V, 50 Hz ± 2 Hz |
| Equipment | Specification | Qty |
|---|---|---|
Harmonic Voltage Transformer Testing System | ||
High-stability Harmonic Voltage Source | • Output voltage up to 12 kV; • Frequency range 50 Hz to 3 kHz; • Automatic software control. | 1 set (including signal source, power amplifier, step-up transformer) |
10 kV Wideband Voltage Ratio Standard | • Maximum primary voltage specifications 10 kV, • 1 kV, 200 V; • Frequency range 50 Hz～3 kHz; • Accuracy better than 0.02% @ 50 Hz; • Ratio difference better than 0.1% @ 50 Hz～3 kHz; • Angular difference better than 0.001 rad @ 50 Hz～3 kHz. | 3 sets |
Wideband High-accuracy Transformer Tester | • Dual channel input; • Frequency range 50 Hz～3 kHz; • Accuracy better than 0.02% or 0.6’ @ 50 Hz～3 kHz; • Rated input voltage: 50 mV～6 V (RMS). | 1 |
Auxiliary Equipment | • Contains programmable voltage transformer load box, voltage divider, test cables, adapter terminals, cabinets, programmable control software, etc. | 1 set |
Harmonic Current Transformer Test System | ||
Wideband High-Current Harmonic Source | • Output current 1A～600A; frequency range 50 Hz～3 kHz; • Automatic software control. | 1 set (including signal source, power amplifier, current booster) |
Wideband Current Ratio Standard | • Maximum primary current specifications 5 A, 20 A, 100 A, 600 A; • Rated secondary current 1 A; • Frequency range 50 Hz ~ 3 kHz; • Ratio difference better than 0.02% @ 50 Hz～3 kHz; • Angular difference better than 0.6’ @ 50 Hz～3 kHz. | 4 sets |
Wideband Standard Shunt | • Nominal output: 1 V; • Resistance: 1 Ω or 0.2Ω • Frequency range: 50 Hz ~ 3 kHz; • Accuracy better than 0.02% or 0.6’ @ 50 Hz to 3 kHz. | 2 |
Wideband High-Accuracy Transformer Calibrator | • Dual channel input; • Frequency range 50 Hz～3 kHz; • Accuracy better than 0.02% or 0.6’ @ 50 Hz～3 kHz; • Rated input voltage: 50 mV～6 V (RMS). | 1 |
Auxiliary Equipment | • Contains programmable current transformer load box, test cables, transfer terminals, cabinets, programmable control software, etc. | 1 set |
| Equipment | Specification | Qty |
Harmonic Voltage and Current Transformer Comprehensive Test System | ||
High-Stability Harmonic Voltage Source | • Output voltage up to 12 kV; frequency range 50 Hz ~ 3 kHz; • Automatic software control. | 1 set (including signal source, power amplifier x2, step-up transformer, current booster) |
Wideband High-Current Harmonic Source | • Output current 1A to 600 A; frequency range 50 Hz ~ 3 kHz; • Automatic software control. | |
10 kV Wideband Voltage Ratio Standard | • Maximum primary voltage specifications 10 kV, 1 kV, 200 V; • Frequency range 50 Hz ~ 3 kHz; • Accuracy better than 0.02% @ 50 Hz; • Ratio difference better than 0.1% @ 50 Hz ~ 3 kHz; • Angular difference better than 0.001 rad @ 50 Hz ~ 3 kHz. | 3 sets |
Wideband Current Ratio Standard | • Maximum primary current specifications 5 A, 20 A, 100 A, 600 A; • Rated secondary current 1 A; • Frequency range 50 Hz ~ 3 kHz; • Ratio difference better than 0.02% @ 50 Hz ~ 3 kHz; • Angular difference better than 0.6’ @ 50 Hz ~ 3 kHz. | 4 sets |
Wideband Standard Shunt | • Nominal output: 1 V; • Resistance: 1 Ω or 0.2Ω • Frequency range: 50 Hz ~ 3 kHz; • Accuracy better than 0.02% or 0.6’ @ 50 Hz ~ 3 kHz. | 2 |
Wideband High-Accuracy Transformer Calibrator | • Dual channel input; • Frequency range 50 Hz ~ 3 kHz; • Accuracy better than 0.02% or 0.6’ @ 50 Hz ~ 3 kHz; • Rated input voltage: 50 mV ~ 6 V (RMS). | 1 |
Auxiliary Equipment | • Includes programmable voltage/current transformer load box, voltage divider, test cable, transfer terminal, cabinet, programmable control software, etc. | 1 set |
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