Power transformers for the entire power system safe and stable operation can have a crucial impact

As the core of the power system equipment, power transformers for the entire power system safe and stable operation can have a crucial impact. Among them, the relay action is  air circuit breaker  the reliability of  power transformers  key elements of safety equipment. However, the operation of the electricity transformer protection statistics show that, as a large power transformer differential protection for  mcb circuit breaker , the correct action rate has been at a low level, which is the actual current grid security requirements and levels of development do not match. In recent years, with the structure and composition of the power system complexity increases.

In the transformer no-load input power supply or external fault voltage recovery process after resection

Transformer differential protection as main protection for quick removal transformer internal fault plays an important role. Load power on the transformer or the external fault voltage Electric energy meter process, are generated inrush current, especially in the closing voltage of 0 V, the magnetic flux in the transformer core increases rapidly, instantaneously saturate the iron core, there big impact excitation current value (up to 5 to 10 times the rated current), often referred to as  circuit breakers . Inrush current treatment directly affects the choice of means to the differential protection action behavior may lead to differential protection tripping or malfunction. Transfer from the hot spare transformer operation, main transformer, the ratio differential protection tripped the switch on each side of the main transformer; transformer, the percentage  air circuit breaker  again the action, jump on each side of the main transformer switch. Differential protection immediately after the inspection station equipment without exception; relevant checks carried out on the transformer, primary equipment insulation inspection and oil samples for testing are satisfactory; protection device checks the 2nd Main Transformer Protection of second harmonic restraint and related protection logic function tests, the action is correct.

Waterproof role of fire and explosion isolation doors

Fire, flood and explosion is a significant threat to the safety of the mine disaster , waterproof fire -proof doors are controlled isolation scope of these major disasters, the most important means , but the isolation doors closed will change mine ventilation system , to change the main fan operating point , may cause localized  power transformers breeze or no wind , gas gauge , main fan surge issues such as isolation gate position in the design of mine when the resulting security risks must be fully considered in order to protect isolated gate enabled the mine ventilation system security. Waterproof role of fire and explosion isolation  Air circuit breaker the mine threat in a panel adjacent to the panel and the whole mine fires, floods, explosions of major disasters , in order to prevent the accident and reduce the life of these major disasters , loss of property , accident closed  mcb circuit breaker  fire and explosion isolation doors , protecting the mine area and the other disk into the return air main roadway , wellbore safety and to avoid disasters expanding spread. Isolated door panel settings are mine happen water, fire , explosions and other major disasters of the last mine safety barrier is to ensure mine safety emergency last line of defense , so the isolated gate setting has important practical significance.

The need for explosion-proof measures Cable Joints research

Currently, many power cables in tunnels, pipe (work well), bent in the form laid the event of failure, can easily lead to a fire, threatening the security of the grid. Moreover, a large number of cable fault occurred in the middle of the cable joints, the failure process of the energy accumulation, when there is an explosion happens, endanger the safety of  power transformers , to this end, it is necessary to carry out the measures Cable Joints explosion research. Power grid construction in the downtown area and out of the line most of the new substation using cable.  electric meter  the cable tunnel 20, total length of 33 km; has built 500 kV EHV power cables 2, 220 kV EHV power cables 197, 110kV EHV power cable 718. Cable in the tunnel, pipe (work well), cable layers and laying in trenches, Cable Joints  Voltage stabilizer  conditions, materials, technology and other factors, to become the weak link cable lines. And in the event of Cable Joints fault, the resulting destructive not only cause power outages this line may also be run on the surrounding cable lines, power facilities and personnel injury, and even lead to secondary accidents.

Converter station to prevent the spread of fires and major facilities, including fire detection and alarm system

Converter station to prevent the spread of fires and major facilities, including fire detection and alarm systems, fire water systems and other fire fighting facilities. Because of the special status and operational characteristics of the system, the converter  mcb circuit breaker  protection systems require a higher reliability. Currently the world is no converter station fire protection systems standards. Statistics show that in addition to converter valve and the valve hall, converter stations from other  circuit breakers  and buildings caused by fire is not much. Converter valve is the core of the converter station equipment, valves and valve hall commutation converter station fire protection systems is critical. With the increasing cable line, Cable Joints induced failure probability increased.

Station power system with AC power system is basically the same substation

Guarantee converter station master work to other needed facilities. Including: station power system converter valve cooling system, valve hall air conditioning systems, fire  mcb circuit breaker  and grounding net. Station power system with AC Substation basically the same  Voltage stabilizer , including the AC systems and DC systems in two parts. AC system to ensure the normal power supply AC electrical equipment, DC system to ensure that all control, protection, communications, operations,of normal power supply. Control, protection and monitoring of the DC power system generally requires two low voltage battery and to supply uninterrupted power supply.

Fire and explosion agent is only one principle of fire and explosion suppression method

Fire and explosion agent is only one principle of fire and explosion suppression method. Fire and explosion agents premises used fuel with the air already exists and has been mixed,  mcb circuit breaker  isolation method can not be used; fire and explosion hazard does not occur when the temperature is not high, does not exceed the ignition, without cooling to below the ignition point. Inhibitors can prevent the occurrence  air circuit breaker . When the external fire source pyrolysis fuel to produce free radicals, if radical inhibitor was caught with, you lose the function of transfer chain reaction, chain reaction will be terminated, the combustion reaction can not be carried out, to prevent the effects of combustion takes place.