How Often Is the Level-3 Power Testing and Testing Electric Power Facility License Inspected?
According to IEC and relevant national regulations, transformers in production, whether semi-finished or finished products, as well as newly installed or overhauled transformers, must undergo transformer ratio testing before being put into operation. The "Regulations for Handover and Preventive Tests of Electric Power Equipment" also require regular transformer ratio measurements for transformers in service. Transformer ratio testing can check the condition of windings and tap changers, and determine whether there are defects such as coil short circuits, incorrect connections, or inter-turn short circuits, thereby ensuring the safe use of the equipment.
The transformer ratio and group tester uses a 32-bit ARM core as the processing center to control the entire device. It enables the ratio measurement of single-phase or three-phase transformers to be completed in one operation. The instrument's operation is fully displayed in Chinese menus, making it simple and intuitive. The test results are accurate and reliable, and the instrument can store and print test results. It has strong anti-interference capability and can meet the needs of transformer ratio testing for various small, medium, and large transformers.
Features of the Transformer Ratio and Group Tester
1. Especially suitable for ratio and phase difference testing of special transformers.
2. Especially suitable for measuring rectifier transformers with phase shift, displaying the phase shift angle intuitively.
3. Automatically generates three-phase (120°) or two-phase (90°) power sources with stable amplitude and constant phase.
4. Not constrained by the internal wiring of the transformer, directly measures the voltage ratio and phase angle difference between the high and low voltage sides.
5. True simultaneous measurement of three phases.
6. Test parameters are set once, and after switching the tap changer, the test is performed directly, automatically determining the tap position and the standard ratio after switching.
7. Fast speed, with a test time of 8 seconds for one set of data.
8. Test results are not affected by fluctuations in the frequency or amplitude of the power supply.
9. Built-in overcurrent protection and protection against reverse connection of high and low voltage.
10. The entire test process can be controlled by an upper computer, with data saving and test report printing.
11. Test results are automatically saved, with a maximum of 99 records.
12. The instrument has a built-in user manual that can be consulted at any time.
Equipment List for Level-3 Power Testing Qualification:
|
Equipment Category |
Equipment Name |
Unit |
Quantity |
Specification |
|
I. High Voltage Generation Equipment |
DC High Voltage Generator |
Set |
1 |
DC: 200kV/3mA |
|
Set |
1 |
DC: 120kV/2mA |
||
|
Power Frequency Withstand Voltage Test Device |
Set |
1 |
AC: 10kVA/100kV |
|
|
Set |
1 |
AC: 5kVA/50kV |
||
|
Variable Frequency Series Resonance Test Device |
Set |
1 |
500kVA/200kV/2.5A, 30～300Hz |
|
|
Induced Withstand Voltage Test Device |
Set |
1 |
5kVA/360V, 150Hz |
|
|
II. Electrical Measuring Instruments |
High Voltage Dielectric Loss Tester |
Unit |
2 |
1. Dielectric measurement accuracy: 1% |
|
Loop Resistance Tester |
Unit |
2 |
DC: ≥100A |
|
|
Transformer Volt-Ampere Characteristic Tester |
Unit |
1 |
1100V/5A |
|
|
Ground Resistance Tester |
Unit |
1 |
Heterodyne method |
|
|
Capacitance and Inductance Tester |
Unit |
1 |
|
|
|
Ground Continuity Tester |
Unit |
1 |
DC: 1A |
|
|
Transformer DC Resistance Tester |
Unit |
2 |
DC: ≥10A |
|
|
Transformer Ratio Tester |
Unit |
1 |
Digital, class 0.5 |
|
|
Transformer Winding Deformation Tester |
Unit |
1 |
Frequency response method |
|
|
On-Load Tap Changer Tester |
Unit |
1 |
I≥1A |
|
|
Circuit Breaker Characteristic Tester |
Unit |
2 |
|
|
|
Zinc Oxide Arrester Resistive Current Tester |
Unit |
1 |
|
|
|
Three-Phase Relay Protection Tester |
Unit |
1 |
Three-phase voltage and current, 2 sets each |
|
|
Lightning Counter Calibrator |
Piece |
1 |
|
|
|
Insulation Resistance Tester |
Unit |
2 |
DC: 0～5000V, 200G(Ω) |
|
|
III. Oil and Gas Testing Instruments |
SF6 Leak Detector |
Unit |
1 |
Sensitivity: 1ppmv |
|
SF6 Gas Moisture Tester |
Unit |
1 |
|
|
|
IV. Common Instruments and Meters |
Megohmmeter |
Piece |
1 |
DC: 2500V |
|
Megohmmeter |
Piece |
1 |
DC: 500V |
|
|
Digital Dual-Clamp Phase Volt-Ampere Meter |
Piece |
1 |
Measurement current: 1mA～5A |
