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500kV Transformer High-Voltage Load Simulation Test | HTB-8000 Circuit Validation & Phase Compensation Workflow
Publish Date:2024/08/15武漢市豪邁電力自動化技術(shù)有限責(zé)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 (中壓側(cè)), short circuit at 5011-1 (高壓側(cè)).

 

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、試驗(yàn)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.
 

△Transformer protection relay A sampling

 

△ Transformer protection relay B sampling

 

△ Transformer protection relay differential value reading

 

△Transformer protection relay differential value reading

 
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Copyright ? 2024 All rights Reserved.

備案號：鄂ICP備05010718號-1