1500kVA/300kV Series Resonance Withstand Voltage Test Equipment

1500kVA/300kV Series Resonance Withstand Voltage Test Equipment

Overview

The HZXB-1500kVA/300kV variable frequency series resonance test system is a complete, field-deployable high-voltage AC withstand voltage (AC hipot) testing solution for cables, generators, GIS switchgear, transformers, and other large capacitive electrical equipment. 

The system consists of four integrated subsystems: a 120 kW variable-frequency power supply (HZXB-F-120kW), a 120 kVA multi-tap excitation transformer, two 750 kVA / 150 kV oil-insulated high-voltage reactors, and a 300 kV / 1000 pF capacitive voltage divider. The reactors can be connected in series (300 kV / 5 A) or in parallel (150 kV / 10 A) to match the test object's voltage and capacitance requirements - making the HZXB-1500kVA/300kV a versatile single-system solution for three distinct classes of test objects.

Advantages

1 Resonant Power Amplification - 1,500kVA Output from 120kW Input

The series resonant principle exploits the LC resonance between the high-voltage reactors (L) and the test object's capacitance (C) to achieve a voltage amplification factor equal to the system Quality Factor (Q):

System Q ≥ 30 at f = 45Hz: the 120kVA excitation transformer output is amplified 30× or more across the test object

Practical result: 5kV excitation → 150kV+ test voltage; 8kV excitation → 240kV+ test voltage

Power input: only 120kW (380V three-phase) required at the point of use - compatible with standard substation auxiliary supplies

Weight advantage: the complete system (~2,235 kg total) weighs a fraction of a 1,500kVA test transformer, enabling helicopter or crane-assisted site access to remote substations

2 Dual Reactor Configuration - Flexible Coverage Across Test Objects

Each reactor: 750kVA / 150kV / 5A / 160H oil-insulated; Q ≥ 30 at 45Hz; temperature rise ≤ 25K after 90 min at rated load.

3 Variable Frequency Power Supply - 30 to 300Hz Precision Tuning

The variable frequency approach allows the supply to scan from the set start frequency to end frequency and automatically lock onto the resonant peak - eliminating the need to pre-calculate the exact resonant frequency or manually tune during the test.

4 Three Operating Modes for Maximum Flexibility

5 Intelligent Control System - Large-Screen Touchscreen HMI

The variable-frequency power supply features a large-screen color touchscreen LCD with external mouse interface displaying:

Real-time monitoring:

Resonant voltage (test voltage), test frequency, measured frequency

LV voltage and LV current, withstand time elapsed

Frequency curve and voltage curve for instant visual resonance confirmation

Parameter configuration:

Start/end frequency, start voltage, staged voltage ramp steps and timing

Capacitor-to-inductor-to-frequency conversion calculator

Voltage divider ratio, excitation transformer ratio, protection thresholds

Protection settings (configurable thresholds):

Over-voltage protection, over-current protection, flashover protection

Detuning protection (detects drift from resonant peak), under-voltage protection, zero-position interlock, emergency stop

6 Multi-Layer Safety Protection System

All protection events are logged with timestamp and fault code for post-test review.

7 Capacitive Voltage Divider - Precision High-Voltage Measurement

The capacitive divider enables accurate measurement of the actual test voltage on the high-voltage side without direct connection to the HV circuit, meeting IEC 60060 Class 1.5 accuracy requirements for acceptance test reporting.

8 Data Management & Reporting

Data Management Features

Storage: 50 test records (voltage, frequency, timing, protection events) – non-volatile

Export: USB interface for printing/archival

Printer: Thermal or laser (optional, per contract)

Review: On-screen query and re-print capability

Auto Logging: Automatic recording of all voltage steps and timing

FAQ

Q1: Why series resonance over a conventional test transformer? 1/30th power, 2,235kg vs 10,000kg, low flashover.

Q2: How does it find and lock the resonant frequency? Auto scans, detects peak, locks. 10–30s.

Q3: How are the two reactors connected? Parallel 80H for cables/gens; series 320H for GIS.

Q4: What protection is offered against flashover? Sub-ms disconnect. Low fault energy, less damage.

Q5: What are the after-sales service terms? 1yr warranty, lifetime maintenance, 8h response.

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