500kV Transformer High-Voltage Load Simulation Test

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500kV Transformer High-Voltage Load Simulation Test | HTB-8000 Circuit Validation & Phase Compensation Workflow

Publish Date:2024/08/15武汉市豪迈电力自动化技术有限责任公司

1. Equipment Overview

Deployed HTB-8000 High-Current/Voltage System (3x HTB-8000B parallel current sources, 3x HTB-8000C series voltage sources) with integrated capacitive compensation to overcome large transformer impedance.

2. Capacitive Compensation Principle

To address transformer short-circuit impedance (22.16% per nameplate), the test circuit uses:
✔ Series Capacitors: Partial inductive compensation for reduced system impedance.
✔ Parallel Capacitors: Achieve near-resonance (cosφ → 0) to minimize active power consumption.
This dual compensation allows 100A testing at 1300V with only 2kW input power.

3. Wiring Configuration

Phase-A Power Injection

HTB-8000 Phase-A wiring for capacitive compensation at 500kV substation

△ Phase-A capacitive wiring

AC380V Single-Phase Variac → HTB-8000B (controls parallel caps) → HTB-8000C (series caps).
Maintained 120° phase separation using shared neutral line.

2）Transformer Interface：

500kV transformer primary busbar wiring diagram for load simulation

△ Main transformer connection

Grounding disconnects: 2211-1/2211-2 open.
Current injection via CT P1 terminal (中压侧), short circuit at 5011-1 (高压侧).

4. Field Safety Protocols

✅ CT Secondary Circuits: Never opened under current flow.
✅ Grounding Integrity: All HTB-8000 units bonded to substation grid.
✅ Guarded Zones: Isolate test areas from live equipment.

2、试验流程：

Plugged 1000MVA capacity and 22.16% impedance into HTB-8000B controller.
Calculated test voltage: 1172V @100A (Z=11.72Ω).

HTB-8000B interface for transformer nameplate data input (505kV/230kV)

△ Parameter settings

Voltage/Current Output Capture

HTB-8000 voltage-current phase tracking at 95% capacitive compensation

△ Test values

Test values

△ Test values

6. Results & Validation

Theoretical Differential: 0A (matched protection system readings).
YD-300 Wireless Analyzer: Confirmed 0.011A (HV) vs 0.025A (MV) secondary currents.
Near-Zero Differential Drift: Both Protection A/B suites showed <0.005A imbalance.