The HZZK-III Transformer Short-Circuit Impedance Tester is a new-generation transformer parameter testing instrument independently developed by our company. It is designed for low-voltage short-circuit impedance measurement of main transformers rated 35kV and above, in both field and laboratory environments.
Short-circuit impedance is a critical parameter of transformers. The short-circuit impedance method is a traditional approach for assessing winding deformation. According to GB1094.5-2003 and IEC60076-5:2000, the change in short-circuit reactance is the sole criterion for determining whether a transformer winding has been deformed.
| Parameter | Range / Specification |
|---|---|
| Voltage (automatic range) | 15–400V ±(readings × 0.2% + 3 digits) ±0.04% (range) |
| Current (automatic range) | 0.10–20A ±(readings × 0.2% + 3 digits) ±0.04% (range) |
| Power | COSφ > 0.15 ±(readings × 0.5% + 3 digits) |
| Frequency (power frequency) | 45–65 Hz; measurement range ±0.1% |
| Short-circuit impedance | 0–100%; measurement range ±0.5% |
| Repeatability stability | Ratio error < 0.2% |
| Instrument display | 5 digits |
| Parameter | Specification |
|---|---|
| Instrument protection current | When test current exceeds 18A, the instrument’s internal relay disconnects for over-current protection |
| Ambient temperature | -10°C to 40°C |
| Relative humidity | ≤ 85% RH |
| Operating power | AC 220V ±10%, 50Hz ±1Hz |
| Dimensions | 380 × 260 × 120 mm |
| Weight | 4.5 kg (excluding test lines) |
Q1: Is your company a sales agent or a manufacturer?
We are an integrated trade and manufacturing company with our own factory.
Q2: Can you customize our own brand or the built-in software of the machine if we have special requirements?
Yes, we accept OEM/ODM/OBM and can customize the built-in software of the product according to the customer’s special requirements.
Q3: What is the usual lead time? How long will it take to receive the order after placing it?
In normal circumstances, products in stock can be received within 5 to 7 days via the fastest international express. Other situations may vary depending on the quantity of products ordered, whether there are special customization requirements, and the delivery time chosen.
Q4: How do you ensure the product will not be damaged during transportation, considering its large size?
We use professional internal and external packaging to ensure the safety and stability of the products during transportation. For fragile or other special parts, we include an extra set so that the customer can use the product immediately upon receipt.
Q5: How do you handle after-sales service? What if there is a quality problem or the customer does not know how to operate the product?
For quality issues not caused by human error, we provide a one-year warranty from the time the product is delivered, along with lifetime technical support. Other after-sales issues will be addressed by our professional technical staff within 24 hours. The product comes with a user manual and an operation video.
