5.
Relay protection and hydropower automation equipment…
109
5.1.
A brief history of the development
of relay protection and
automation……………………………………………………..
109
5.2.
Relay. Purpose and main tasks…………………………………
114
5.3.
Basic requirements for relay protection and automation.
Types
of relays…………………………………………………………
117
5.4.
Methods of depicting relays and
protection circuits in the
drawings. Ways of impact protection on the switch. Direct and
indirect acting relays……………………………………………
120
5.5.
Connection diagrams of current transformers of relay windings.
123
5.6.
General information about electromechanical relays. Using the
electromagnetic principle when running relays. Electromagnetic
relays. Current tripping and returning relay…………………..
129
5.7.
Electromagnetic current and voltage relays…………………….
135
5.8.
Relays are intermediate, index and time………………………..
137
5.9.
Sources of operational current. Schemes
of alternating and
direct operational current……………………………………….
145
6.
Types of protection used in hydropower equipment………..
152
6.1.
Current protection. The principle of operation and circuit
connection of the maximum current protection………………...
152
6.2.
Current cutoffs. Selection of the current cut-off setting. Schemes
of current cutoffs………………………………………………
160
6.3.
Non-selective current compartment with time delay. Non-
216
selective current compartment without time delay……………..
166
6.4.
Three-stage current protection and their main organs…………..
171
6 .5.
Types of damage and abnormal modes of generators. Types of
protection for synchronous generators………………………….
175
6.6.
Current cutoff of transformers and their connection scheme…...
181
6.7.
Differential protection of transformers. Selection
of differential
current tripping current…………………………………………
185
6.8.
Calculation of the number of turns
of the relay windings RNT-
565 and DZT-11………………………………………………..
190
Glossary………………………………………………………..
198
References……………………………………………………….
206
