What is the acceleration after the reclosing?
A: When the protected line fails, the protection device selectively cut off the fault line, at the same time reclosing action, coincidence once, if coincident with a permanent fault, the protection device immediately without time limit, no action Disconnect the breaker again. This protection device is called reclosing after the acceleration, the general increase in an intermediate relay can be achieved.
What is automatic reclosing?
Answer: When the circuit breaker trips, can not manually operate and quickly make the circuit breaker automatically re-closing device called automatic reclosing.
ground distance protection What are the characteristics?
A: The grounding distance protection has the following characteristics:
(1) can protect a variety of ground fault, but only with a distance relay, wiring is simple.
(2) allows a large grounding transition resistance.
(3) protection action speed, good action characteristics.
(4) by the system operation mode changes little effect.
battery plate in the operation of what is the characteristics of curing?
A: The battery is running in the plate curing characteristics are:
(1) to take the bubble premature charging or a charge that began to take bubbles. (2) charging voltage is too high, the discharge voltage drops below normal. (3) positive plate brown with white spots.
What causes the transformer oil shortage?
A: The transformer oil shortage is due to:
(1) long-term oil leakage transformer or a large number of oil spills.
(2) repair the transformer, the oil does not put oil in time.
(3) oil pillow capacity is small, can not meet the operational requirements.
(4) the temperature is too low, oil pillow oil storage capacity.
battery in operation plate short circuit What are the characteristics?
A: There are three characteristics of the plate short-circuit:
(1) the voltage is low (sometimes zero) when charging or discharging.
(2) the proportion of electrolyte during charging can not be increased.
(3) Charging less bubbles and bubbles occur late.
battery in operation in the plate bending What are the characteristics?
A: The plate bending characteristics have three points:
(1) plate bending.
(2) plate cracking.
(3) the cathode plate lead sponge swollen and into a moss-like tumor.
general circuit breaker operating handle on the "5-8", "6-7", "2-4" What is the contact? What do they turn on when operating the handle? What position is disconnected?
"6-8" is the closing contact, is in the "closing" position, after the "closing" position is disconnected; "6-7" is the trip contact, in the "tripping" position, "2-4" is the reclosing discharge contact, "Ready to trip" and "After the trip" position is turned on, "Ready to close" position is disconnected.
relay protection What is the role?
A: The relay protection device can respond to electrical equipment failure and abnormal working conditions and automatically automatically and selectively act on the circuit breaker will be faulty equipment removed from the system to ensure trouble-free equipment to continue normal operation, the accident is limited to Minimum range, improve the reliability of system operation, the maximum guarantee to the user safety, continuous power supply.
What is the over-current protection delay characteristics?
A: The short-circuit current flowing through the protection device and the relationship between the operating time of the curve is called the protection device delay characteristics. Delay characteristics are divided into fixed time delay characteristics and inverse time delay characteristics. The operation time of the definite time delay is fixed, irrespective of the size of the short circuit current.Inverse time delay operation time and the size of short-circuit current, short-circuit current, short action time, short circuit current, action time. Short-circuit current and action time into a certain curve.
"Electricity Act" What are the basic principles?
A: The basic principles of the Electricity Law are:
(1) The cause of electric power should be based on the needs of national economic and social development appropriate development ahead of the principle.
(2) The State encourages domestic and foreign economic organizations and individuals to invest in developing power sources according to law, to set up electric power production enterprises, Who benefits from the principle.
(3) The principle of the protection of power facilities and electric energy by the State.
(4) The principles of environmental protection and pollution prevention shall be protected according to law in power construction and electric power production.
(5) The state encourages and supports the principle of using renewable energy and clean energy for power generation.
(6) The power enterprises shall, according to law, implement the principle of self-management, self-financing and supervision.
(7) The principle of the state to help and support the development of power industry in ethnic minority areas, remote areas and poverty-stricken areas.
(8) the state encourages the use of advanced technology and management methods to develop the power industry principles.
