Protection devices shall meet the requirements of reliability, selectivity, sensitivity and speed mobility of these four requirements, the wiring terminals play an important role.

First excised by faulty equipment or line protection failure, when faulty equipment or line protection or circuit breaker refuse to move, allowed by adjacent equipment protection, line protection or breaker failure protection to the fault. On the lower grid (similar) tuning between the relay, to be followed step by step with the principle, in order to ensure the removal of faulty grid failure occurs selectively. Cut off part of the fault in the system, and other non-defective parts, continue to supply power.

Protection device should be removed as soon as possible to short-circuit fault, its purpose is to improve system stability, reduce the extent of damage of faulty equipment and wiring, narrow failure affected the scope and improve the automatic reclosing and spare equipment automatically put into effect.

Be within the scope of protection of the equipment or line metallic short circuit protection device should have the necessary sensitivity coefficient (specific provisions in the statutes). Relay setting value. The setting values ?checksum generally once a year.

Protection devices within the scope of protection of this operation should be reliable operation, when the normal operating state, should operation should be reliable and does not operate. Any electrical equipment (lines, busbars, transformers, etc.) are not allowed to run in the state of no relay, reliability is the most fundamental requirement of relay protection device performance.

Protection devices terminals require index is very high, users to buy brand terminals is a wise choice can also greatly reduce the occurrence of unnecessary loss Elinker production brand terminals trustworthy, currently the company's products has passed through the European CE certification, full compliance with international standards.