Improvements in or relating to current differential protection relays
A protection relay and differential protection technology, applied in multiple unbalanced current/voltage switches, emergency protection circuit devices, emergency protection devices with automatic disconnection, etc. Relay reliability, reducing the sensitivity of protection relays, etc.
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[0026] figure 1 A schematic diagram of a protected area 8 in a three-phase power system is shown.
[0027] The protected area 8 is defined by two sets of current transformers as follows: a first set of three local current transformers each corresponding to a phase at one end of the protected area 8 (at figure 1 Only one local current transformer 25 is shown in ; and a second set of three remote current transformers each corresponding to a phase at the other end of the protected area 8 ( figure 1 Only one local current transformer 27 is shown in .
[0028] Each local current transformer 25 is electrically coupled to a protective relay (in figure 1 Only one protective relay 10 is schematically shown in , and each remote current transformer 27 is electrically coupled to the other protective relays (in figure 1 Only one other protective relay 26 is shown in . Protective relay 10,26 has and figure 1 The same configuration as shown in the protective relay 10.
[0029] In pract...
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