DL/T 2602-2023 in English
VALIDSelection and test guidelines for protective apparatus of electric DC power system
- Issued on:2023-05-26
- Implemented on:2023-11-26
- File Format:PDF
- Delivery:Via email within 5 business days
$350.00
Introduction
Analysis of the core content of the standard
As the first technical specification in the power industry specifically for protective devices in DC power supply systems, this document focuses on solving the problem of over-tripping caused by confusion in the selection of protective devices and insufficient level matching in DC systems of substations and power plants.
Comparison of standard frameworks
| Dimensions | DL/T 2602-2023 | DL/T 5044 | GB/T 14048.2 |
|---|---|---|---|
| Scope of application | DC system of valve-regulated lead-acid batteries | DC system design of power engineering | General low-voltage circuit breakers |
| Technical focus | Differential coordination of protective devices | System architecture design | Basic performance of circuit breakers |
| Innovative content | Specifications for electronic time-delay DC circuit breakers | Classification of power supply modes | General requirements for AC/DC |
Detailed explanation of key technical requirements
4.1 Classification of protective devices
The standard divides protective devices into:
- Fuse: Suitable for feeder end protection
- DC circuit breakers: Include mechanical/electronic time-delay types
Engineering selection principles: It is recommended to use three-section DC circuit breakers for centralized radial power supply systems. Their long delay, short delay and instantaneous protection characteristics should meet the short-circuit current estimation requirements in Appendix C.
5.2 Selective verification method
Take a 500kV substation as an example to verify the differential coordination of the battery group export circuit breaker and the feeder circuit breaker:
- Test the short delay characteristics of the upper circuit breaker (typical value 50-100ms)
- Measure the full disconnection time of the lower circuit breaker (should be ≤30ms)
- Verify that the action timing difference when the fault current is 2000A is ≥20ms
Implementation suggestions
Transition plan for the old and new systems
It is recommended to adopt a phased implementation for the transformation of the existing system:
| Phase | Work content | Period |
|---|---|---|
| 1 | Replacement of protection devices for key circuits (such as relay protection devices) | 3 months |
| 2 | Complete station differential coordination verification | 6 months |
Technology development trend
With the maturity of solid-state circuit breaker technology, future standards may add:
- Microsecond fault cutoff requirements
- Adaptive protection algorithm verification
- Digital twin test method
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