GB/T 32576-2016 in English
VALIDGuide of calculating settings of auxiliary power relay protection for pumped storage power plant
- Issued on:2016-04-25
- Implemented on:2016-11-01
- File Format:PDF
- Delivery:Via email within 5 business days
$418.00
《GB/T 32576-2016抽水蓄能电站厂用电继电保护整定计算导则》由524（中国电力企业联合会）归口，主管部门为中国电力企业联合会。
Introduction
Interpretation of the core content of the standard
| Protection type | Key setting parameters | Sensitivity requirements | Typical action time limit |
|---|---|---|---|
| High voltage plant transformer longitudinal differential protection | Minimum action current (0.4-0.6) Ie Slope 15%-30% | ≥1.5 | Instantaneous |
| Low voltage plant transformer overcurrent protection | Self-starting coefficient Kst=5-7 Coordination coefficient 1.1-1.2 | ≥1.3 | 0.2-0.4s step difference |
| High voltage motor protection | Quick-break high value (6-8)Ie Low value (5-7)Ie | ≥2.0 | 0s/0.3s |
Key technical points
Short-circuit current calculation specification
The standard requires the use of GB/T 15544.1 and NB/T 35043 specifications:
- Ignore the resistance component and use the sub-transient reactance Xd" saturation value
- The equivalent electromotive force standard value is 1 and the phase is consistent
- When calculating the periodic component, the non-periodic component coefficient Kap(1.5-2.0) needs to be considered
Typical protection setting case
A 6300kVA transformer, the measured unbalanced current is 0.15Ie:
- Minimum operating current = 1.3×(0.03×2+0.05)×Ie=0.143Ie→take 0.5Ie
- Slope S=(2.5-0.5)/(10-0.8)=0.22
- Differential quick break take 7Ie
Analysis of Standard Evolution
This standard establishes a dedicated power supply protection system for pumped storage for the first time. The innovations include:
- Added special protection clauses for SFC transformers (Chapter 5.6)
- Clarified the calculation method of motor feedback current (Formula 36)
- Detailed the timing coordination of automatic switching of backup power supply (Article 5.7.3)
Implementation Suggestions
- New power stations should establish a setting calculation template according to Appendix A
- It is recommended to use the dynamic verification method to verify protection coordination
- Regularly test unbalanced current (Article 3.1 requirement)
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