DL/T 2018-2019 in English
VALIDSpecifications for generator-motor and transformer relay protection equipment of pumped storage power plant
- Issued on:2019-06-04
- Implemented on:2019-10-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$253.00
| Standard No: | DL/T 2018-2019 |
| Document status: | VALID |
| Title in English: | Specifications for generator-motor and transformer relay protection equipment of pumped storage power plant |
| Title in Chinese: | 抽水蓄能发电电动机变压器组继电保护装置技术条件 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2019-06-04 |
| Implemented on: | 2019-10-01 |
| Professional Classification: | DL-Electricity |
| Related Keywords: | protection demagnetization protection
protection needs insulation protection transformer relay protection equipment longitudinal differential protection |
| Related Topics: | to pump water
Relay protection device relay protection pumped storage Low Voltage Motor Protector Relay protection device Generator set quality technology dl/t2011-2019 dl/t1966-2019 dl/t5784-2019 dl/t5787-2019 dl/t 5786-2019 dl/t 799 -2019 dl/t 5796-2019 |
Introduction
Core protection technical requirements
| Protection type | Frequency range | Action time | Special blocking conditions |
|---|---|---|---|
| Longitudinal differential protection | 10-55Hz | ≤30ms@50Hz | Blocking during electrical braking/frequency conversion starting |
| Rotor grounding protection | DC | N/A | Distributed capacitance compensation |
| Inverse time overexcitation | 10-65Hz | Adjustable for 1000s | Three-stage characteristics |
Key technology evolution
This standard proposes dynamic locking logic requirements for the special operating conditions of pumped-storage units (variable frequency starting/electrical braking/pumping and equalization) for the first time. Compared with the standards for conventional hydropower units, the following are added:
- The operating condition identification system needs to detect 7 operating states
- Category 7 protection needs to be configured with a frequency adaptive algorithm (10-65Hz)
- TA saturation protection requirements are increased to 1.2 times the rated current
Typical configuration scheme
Take the Tianhuangping Pumped Storage Power Station as an example, its generator motor protection adopts:
- Dualized longitudinal differential protection (including split-phase transverse differential)
- Injection type + third harmonic voltage grounding protection
- Demagnetization protection and out-of-step protection linkage locking
The main transformer protection configuration emphasizes the phase-changing switch locking mechanism to prevent false operation of the unit before it is connected to the grid.
Implementation suggestions
Acceptance focus:
- 25Hz low-frequency protection action test
- Working condition conversion transient recording analysis
- TA disconnection interlocking logic verification
Operation and maintenance tips: Regularly check the fundamental wave filtration ratio of bearing insulation protection (≥100:1)
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