GB/T 37761-2019 in English
VALIDTechnical requirements of PLC control device of power transformer cooling system
- Issued on:2019-06-04
- Implemented on:2020-01-01
- File Format:PDF
- Delivery:Via email within 5 business days
$301.00
《GB/T 37761-2019电力变压器冷却系统PLC控制装置技术要求》由TC154（全国量度继电器和保护设备标准化技术委员会）归口，主管部门为中国电器工业协会。
Introduction
Interpretation of the core content of the standard
GB/T 37761-2019 specifies the technical requirements for the full life cycle of the PLC control device of the power transformer cooling system, mainly including:
| Technical dimension | Natural oil circulation air cooling | Forced oil circulation air cooling | Forced oil circulation water cooling |
|---|---|---|---|
| Cooling medium | Air | Air + submersible oil pump | Water + submersible oil pump |
| Control complexity | ★☆☆ | ★★☆ | ★★★ |
| Typical power consumption | ≤50VA | ≤70VA | ≤70VA |
Key technical requirements
1. Environmental adaptability
The device must meet the operating temperature range of -25℃~+55℃, IP55 protection level requirements, and pass 12 types of electromagnetic compatibility tests (including 10V/m RF field immunity, 6kV contact discharge, etc.).
2. Functional Architecture
| Functional Modules | Technical Requirements | Typical Implementation |
|---|---|---|
| Cooling Mode Control | Supports automatic conversion of 4 modes: working/auxiliary/standby/stop | PLC program cycle ≤1s |
| Power Switching | Automatic switching time of dual power supply ≤100ms | Mechanical relay + solid-state switch hybrid design |
| Full stop protection | Trip delay error ≤±2.5% | Hardware watchdog + software timing redundancy |
Implementation Points
Typical application cases
When a 500kV substation adopts a forced oil circulation air cooling system, special attention should be paid to the following:
- Submersible pump control circuit conductor cross-sectional area ≥ 4mm²
- Cooler startup interval ≥ 30s
- Modbus TCP communication needs to be configured with a message retransmission mechanism
Standard evolution analysis
Compared with the old version of the standard, GB/T 37761-2019 has the following major improvements:
- Added support for DL/T 860 communication protocol
- Strengthened requirements for damped oscillating magnetic field immunity (30A/m)
- Clearly define the 10-year service life requirement for the device
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