ABB REG316 4 Series - 4. Description of Function and Application

REG 316*4 1MRB520049-Uen / Rev. B ABB Switzerland Ltd
4-1
August 00
4. DESCRIPTION OF FUNCTION AND APPLICATION
4.1. Summary..................................................................................4-3
4.2. Protection functions ................................................................. 4-4
4.2.1. High-impedance.......................................................................4-4
4.2.1.1. General .................................................................................... 4-4
4.2.1.2. Restricted E/F protection for a transformer ..............................4-5
4.2.1.2.1. Basic requirements .................................................................. 4-5
4.2.1.2.2. Components of a restricted E/F scheme..................................4-5
4.2.1.2.3. Design...................................................................................... 4-5
4.2.1.2.4. Example................................................................................... 4-7
4.2.2. Standstill protection................................................................ 4-11
4.2.2.1. General ..................................................................................4-11
4.2.2.2. Standstill protection using an overcurrent function................. 4-12
4.2.3. Rotor ground fault protection.................................................. 4-13
4.2.3.1. Application ............................................................................. 4-13
4.2.3.2. Determining the settings ........................................................ 4-13
4.2.3.2.1. Required data ........................................................................4-14
4.2.3.2.2. Recommended settings for R
f
, respectively ‘U-Setting’ and t ... 4-14
4.2.3.3. Functional check .................................................................... 4-14
4.2.3.4. Installation and wiring............................................................. 4-15
4.2.3.4.1. Location and ambient conditions............................................ 4-15
4.2.3.4.2. Checking the wiring................................................................ 4-15
4.2.3.4.3. Connection of a two-stage scheme........................................ 4-15
4.2.3.4.4. Connection to excitation systems with shaft-mounted diodes .... 4-16
4.2.3.4.5. Adaptation of the scheme in the case of shaft filters.............. 4-16
4.2.3.5. Commissioning ...................................................................... 4-16
4.2.3.5.1. Pre-commissioning checks .................................................... 4-16
4.2.3.5.2. Calibration of the ancillary unit Type YWX111-11/-21............ 4-17
4.2.3.5.3. Measuring the voltage values ................................................ 4-18
4.2.3.5.4. Testing in operation ...............................................................4-19
4.2.3.6. Maintenance .......................................................................... 4-21
4.2.3.6.1. Likely causes of problems......................................................4-21
4.2.3.6.2. Maintenance .......................................................................... 4-21
4.2.3.7. Fault-finding ........................................................................... 4-21
4.2.3.8. Accessories and spares......................................................... 4-22
4.2.3.9. Appendices ............................................................................ 4-22
4.2.4. Application of the underreactance protection function ...........4-26
4.2.4.1. Introduction ............................................................................ 4-26
4.2.4.2. Out-of-step conditions............................................................4-26
4.2.4.3. Monitoring a given load angle ................................................ 4-26