Relay protection device is a very important device in the power system. It is equivalent to a "guard". When the power system fails, the relay protection device can quickly generate alarm message, or directly check out and cut off the operation of the power system.To ensure the safety of the operation of the power system.
Basic requirements for successor protection
(1) Speedness: Quickly resection failure.1 Improve system stability; 2 reduce the action time of users at low voltage; 3 reduce the degree of damage of faulty components and avoid further expansion of faults.Dlbhttt ??; T-failure resection time; TBH-protection action time; TDL-circuit breaker action time; general fast protection action time is 0.06 ～ 0.12s, and the fastest ones can reach 0.01 ～ 0.04s.The action time of the general circuit breaker is 0.06 ～ 0.15s, and the fastest is 0.02 to 0.06s.
Principles of relay protection
Relay protection is based on the increasing current, voltage increases or decreased voltage, decreased voltage, decreased frequency, increased temperature, etc. more than the continuous power protection during the operating process of the change power station.After the limit, during the whole time, there is a choice to issue a trip order or alarm signal.The selective trip is based on the current value. The larger the current value, the faster the trip.Selective cards are called time limit protection according to time. After the time limit is that after the fault current exceeds the set value, the trip order after the time is given.Gas and temperatures are non -electricity protection.
Three errors of relay protection
I. Prevent accidents 1. Increase the training of relay protection staff, earnestly study the "Regulations for Electrical Safety Work Regulations" and the "Regulations on the Safe Work Security Regulations of Relay Protection and Power Grid Safety Automatic Device", and establish a high sense of security responsibility.2. Educate all staff members who do not do things that have nothing to do with work at the scene. Special attention should be paid to the equipment during operation.Protect the door of the screen cabinet lightly; when running a hole around the protection equipment, take measures to prevent and prevent vibration.3. Do not allow a person to go to the scene for maintenance.
Relay protection device
Protection measures: 1. Gas protection 2. Differential protection or current speed break protection 3. Over -current protection 4. Zero -sequential current protection 5, overload protection 6. Over time protection.
What is relay protection
Study the failure of the power system and the abnormal operating conditions that endanger the safe operation to explore the anti -accident automation measures of its countermeasures.In the process of its development, it has mainly used contacts with contacts to protect the power system and its components (generators, transformers, transmission lines, etc.), so that it is damaged, so it is also called relay protection.The basic task is: when the power system fails or abnormal conditions, in the shortest time and the minimum area that may be realized, the faulty device is automatically removed from the system, or the signal is issued by the duty personnel to eliminate the root causeAvoid the damage of equipment and the impact of power supply in adjacent areas.

Related tags： Machinery