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          Principle and application of EPS emergency power supply

          1 EPS emergency power supply works

          When the network power is normal, the emergency power source transfers the network power to the load, and at the same time, the battery charging management is performed, and the inverter unit does not work; when the fire signal is received, the network power or the emergency power (when the network power fails) is forcibly sent to the end of the load; When the power fails, it automatically switches to emergency power supply. The grid power recovery or fire signal is released, and the emergency power source resumes the grid power working state.

          EPS emergency power supply mainly adopts SPWM (AC pulse width modulation) technology. The system mainly includes rectifier charger, battery pack, inverter, and mutual investment device. The inverter is the core. The function of the rectifier is to convert the alternating current into direct current to realize the power supply to the battery and to the inverter module; the function of the inverter is to convert the direct current into alternating current, and supply the load equipment with stable and continuous power; the mutual investment device ensures the load is in the commercial power And the smooth switching between the inverter output; the system controller monitors the whole system in real time, can send out the alarm signal, and can be connected to the computer or Modem through the serial port to realize the microcomputer monitoring and remote monitoring of the power supply system.

          Generally, the switching time from power grid to EPS emergency power supply and from EPS power to grid power supply is no more than 0.1 second -0.2 seconds. When the grid power supply is normal, the EPS emergency power supply is in a state of charge saturation (into a floating state), and the power consumption is less than 0.1% of the nominal capacity.

          2 EPS emergency power supply classification

          (1) According to the output mode, it can be divided into: DC output type, AC/DC hybrid output type and AC output type.

          (2) According to the operation mode, it can be divided into: cold backup type, hot backup type, and online type.

          (3) According to the load characteristics, it can be divided into: emergency lighting power supply and (fire) equipment emergency power supply.

          3 EPS emergency power supply features

          EPS fire emergency power supply has certain advanced and practical functions. It can realize microcomputer monitoring and processing, and realize automatic control of fire emergency facilities such as fire emergency lighting, rolling door, fire elevator, water pump and exhaust fan. Such products are mostly used in high-rise buildings, airports, telecommunications network rooms, hospitals, important venues and other projects. Has the following characteristics:

          (1) When the power grid is powered, it is static, no noise, less than 60dB, no need for smoke exhaust and anti-shock treatment.

          (2) Automatic switching, unattended. The switching time between the grid and the EPS power source is 0.1s-0.25s.

          (3) Strong carrying capacity, EPS is suitable for inductive, capacitive and comprehensive load equipment, such as fire elevators, pumps, fans, emergency lighting, etc.

          (4) Reliable use, in two-machine hot standby mode in important occasions, to ensure reliable power supply in case of accidents and fires, the life of the main engine can reach more than 20a, and the battery is more than 5a-10a.

          (5) Adapt to harsh environment, can be placed in the basement or power distribution room, can be set in place in the emergency load use place, reducing the power supply line.

          (6) For some power facilities with large power, such as: fire pumps, fans, EPS can be directly connected with the motor to start the inverter, and then enter the normal operating state.

          (7) Emergency standby time, the standard type is 60min (with delay interface).

          4 EPS emergency power supply and similar products

          4.1 EPS power supply scheme and self-contained battery lighting scheme comparison

          Since the self-contained battery lamps are very scattered, there are usually hundreds of points in the public buildings, and many thousands of points, and many self-contained battery lamps are not allowed to perform charge and discharge maintenance at the same time, and must be maintained one by one ( At the same time, maintenance may cause an emergency lighting system. The luminaire manufacturer requires charging and discharging maintenance every month, and the maintenance time of each luminaire is 3 hours to 6 hours, which is almost impossible to realize in reality. Even if it is realized, it takes a lot of human and financial resources. This is the biggest advantage of EPS compared to its own battery fixtures. Because of the above advantages, EPS has occupied a large market share in the field of emergency lighting in just a few years. 4.2 The difference between EPS emergency power supply and UPS power supply and comparison

          UPS is the abbreviation of Uninterruptible Power System, which focuses on "uninterrupted" in the power supply parameters. The realization mode is rectification-inverting online operation, and the battery and the inverter DC bus have no break point, thereby ensuring the continuity of the output power. The working principle is that when the network power is normal, the grid power is rectified to DC, and the inverter is powered. The inverter provides power for the load in the long-term operation on the line. When the grid power fails, although the DC power of the grid rectification disappears, The battery continues to supply power to the inverter. In the working process of UPS, online operation is the way to achieve uninterrupted power supply, and it is also the cause of problems. At present, the loss of the rectification link and the inverter link is generally 10%-15%, and the UPS runs online, and this part of the loss is radiated in the form of heat. The EPS is a backup operation or a hot backup operation, and there is almost no loss in the battery full state. The difference between working principle and application shows that UPS can't replace EPS, especially it can't be replaced in fire lighting and power field (UPS online operation itself is a fire accident).

          In summary, EPS and UPS have certain links in the field of classical theory, but the problems to be solved are different, the implementation methods are different, there is no difference in technological advancement, and there is no question of who is advanced and who is backward. The two are like two circles that can be tangent, but not concentric. In most cases, the two are not interchangeable.

          4.3 Comparison between EPS power supply scheme and generator set power supply scheme

          With the in-depth use of EPS, the power emergency power supply will have great market potential. The terminal-type power-specific emergency power supply control cabinet has obtained the national patent. This patent combines emergency power supply, power equipment start-up and power equipment control. It solves the problem that the limited power supply cannot start the power equipment without increasing the EPS components. The 1:1 capacity start of the EPS-connected motor load is realized. The wide application of this technology has made the world theme of energy conservation and environmental protection a great development in the field of emergency power supply for power equipment.

          5 EPS emergency power supply application field

          (1) EPS emergency power supply system The general backup power supply time is 30min-120min (increasing the power supply time must increase the battery capacity, but also increase the volume and increase the cost). Therefore, it should be emphasized that EPS is an emergency power supply product, not a long-term nature. The backup power supply is only used to maintain the reliability of the important load when the normal power supply fails, and to ensure the continuity of the important load over a period of time or within a specified time range. Therefore, EPS emergency power can not be used as a backup power source for common equipment in places where the reliability of normal power supply is poor. Instead, use a diesel generator set or UPS as a backup power source. It can be seen that EPS is most suitable for standby power supply for fire-fighting equipment.

          (2) Equipment that allows interrupted power supply time of milliseconds, such as computers, program-controlled switches, data processing systems, precision electronic instruments, etc., cannot be used as a backup power source, but UPS power should be used.

          (3) When the primary load capacity is not only the lighting or telephone station load, and it is difficult to obtain the second low-voltage power supply from the power system or the adjacent unit, and the continuous power supply time is required to be lower, the EPS can be set as the emergency backup power source.

          (4) When the special important load in the primary load is allowed to be interrupted for more than 0.2S, EPS can be set as the emergency power supply.

          (5) Dispersed small-capacity first- and second-level fire-fighting loads, such as fire-fighting pumps, smoke-proof fans, emergency lighting, etc., can use one-way power supply plus EPS or use one-way power supply and equipment (storage) batteries (group) ) Automatically switch at the device.

          (6) Since EPS has no exhaust, smoke exhaust, no noise, no vibration, and no pollution to the environment, it is not suitable for the use of diesel generator sets for environmental protection requirements. EPS emergency power supply is available.

          (7) For the renovation project, where the diesel generator set cannot be set up, EPS emergency power supply can be used.

          6 EPS emergency power supply application prospects and prospects

          For today's large-scale, high-performance intelligent buildings, the continuity and stability of the system's power supply make the emergency power supply and backup power technology continue to evolve. With its professional design, the EPS system can ensure the normal operation of the overall intelligent security system of large buildings under the condition of unexpected failure (power supply interruption, emergency rescue), so it will be favored by more and more users. .

          Plastic Insulated Control Cable

          1. Product standard

          This product is manufactured according to GB9330 and enterprise standards.

          2. Application

          For system connection wire of control, signal, protection or measuring with rated voltage up to and including 450/750KV,like signal cable,concentric cable.

          3. Operating characteristics

          Rated voltages U0/U: 450/750V

          Permissible Max. continuous operating temperature of conductor:

          PVC insulated: 70a??;XLPE insulated: 90a??.

          Upon short circuit (Max. Duration time 5s) the Max.

          temperature of conductor not higher than:

          PVC insulated: 160a??; XLPE insulated 250a??.

          Ambient temperature of installation not less than 0a??.

          Preferred permissible bending radium:

          For non-armored cable, not less than 6 times of cable diameter;

          For armored or copper-tape-screened cable, not less than 12 times of cable diameter;

          For screened flexible cable, not less than 6 times of cable diameter.

          4. Type, designation and application:

          Type: KVV/KYJV, KVVP/KYJVP, KVVP2/KYJVP2, KVV22/KYJV22, KVV32/KYJV32, KVVR/KYJVR, KVVRP/KYJVRP


          Designation:

          KVV/KYJV: Copper conductor PVC/XLPE insulated PVC sheathed Control Cable

          KVVP/KYJVP: Copper conductor XLPE/PVC insulated PVC sheathed braid screened control cable

          KVVP2/KYJVP2: Copper conductor PVC/XLPE insulated PVC sheathed copper tape screened control cable

          KVV22/KYJV22: Copper conductor PVC/XLPE insulated PVC sheathed steel tape armored control cable

          KVV32/KYJV32: Copper conductor PVC/XLPE insulated PVC sheathed fine steel wire armored control cable

          KVVR/KYJVR: Copper conductor PVC/XLPE insulated PVC sheathed control flexible cable

          KVVRP/KYJVRP: Copper conductor PVC/XLPE insulated PVC sheathed braid screened control flexible cable


          Main application:

          KVV/KYJV: For fixed-laying indoors, in cable duct or conduit

          KVVP/KYJVP: For fixed-laying indoors, in cable duct or conduit upon screen requirement

          KVVP2/KYJVP2: For fixed-laying indoors, in cable duct or conduit upon screen requirement

          KVV22/KYJV22: For fixed-laying indoors, in cable duct direct-buried, able to bear larger mechanical forces

          KVV32/KYJV32: For fixed-laying indoors, in cable duct, conduit or well, able to bear larger mechanical forces

          KVVR/KYJVR: For laying indoors upon moveable requirement

          KVVRP/KYJVRP: For laying indoors upon moveable and screen requirement

          Control Cable

          XLPE Control Cable,Insulated Control Cable,Outer Sheath Control Cable,PVC Flexible Control Cable

          Huayuan Gaoke Cable Co.,Ltd. , https://www.bjhygkcable.com

          亚洲 欧美 图片 自拍 视频
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