GB/T 32576-2016Guide of calculating settings of auxiliary power relay protection for pumped storage power plant (English PDF)

Foreword

This standard is drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This standard specifies the principle and method of setting the relay protection for the auxiliary power system of the pumped storage power station.

This standard applies to pumped storage power station high-voltage transformer transformer protection, low-voltage transformer transformer protection, high-voltage factory motor protection, high Low voltage plant bus protection, diesel generator protection, SFC input and output transformer protection, standby power supply automatic device setting Calculation.

2 Normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this document. For undated references, the latest edition (including all modifications) applies to this document.

Technical specification for relay protection and safety automatic device GB/T 14285

GB/T 15544.1 Calculation of short circuit currents for three phase AC systems - Part 1. Current calculation Guide for calculation of short - circuit current in three - phase AC system for hydropower engineering Code for design of relay protection for NB/T 35010 hydroelectric power plant

3 Basic Provisions

3.1 relay protection device should meet the reliability, selectivity, speed, sensitivity of the basic requirements.

3.2 The setting calculation should follow the principle of action value and action time level.

3.3 set the calculation content should include high-voltage factory transformer high and low voltage side, low-voltage transformer transformer high and low voltage side, SFC input transformer level Pressure side, SFC output transformer high and low voltage side of the three-phase short circuit, two-phase short circuit, single-phase ground short-circuit current calculation.

3.4 factory power short-circuit current calculation principle.

a) Follow the instructions in accordance with GB/T 15544.1, NB/T 35043.

b) Excluding the resistance components in the impedance parameters such as generators, transformers, motors and so on; it can be assumed that the negative sequence impedance of the generator Positive sequence impedance is equal.

c) The positive sequence impedance of the generator motor may be the saturation value of the secondary transient reactance Xd ".

d) The equivalent electromotive force (nominal value) of each generator motor can be assumed to be 1 and the phase is consistent.

e) only calculate the short-circuit transient current in the periodic component, but in the longitudinal differential protection device (referred to as longitudinal protection) in the setting calculation to The nonperiodic component coefficient Kap takes into account the influence of the aperiodic component.

f) The generator voltage should be rated voltage, the system side voltage can be rated voltage or the average rated voltage, regardless of Variation of Actual Position of Transformer Voltage Tap.

g) The phase-to-earth transition resistance excluding the point of failure.

3.5 The setting of the relay protection related to the operating mode shall be calculated in the normal operation mode, in the minimum mode of operation Check sensitivity.