Detailed Introduction:

Overview

With the rapid development of fiber optic communication technology, people have gradually chosen fiber optic as the communication medium in more and more power plants and substations. Fiber optics, with its unparalleled advantages such as high bandwidth, radiation resistance, corrosion resistance, high voltage and high current resistance, among others, make us believe that in the near future, fiber optics will be the most favored communication method in the electricity market.

The advantages of fiber optic Ethernet in power communication

At present, most substations below 220KV use Ethernet communication method. The inherent problems of ordinary twisted pair cables have gradually limited their own development. For example, regarding bandwidth issues, a twisted pair cable can only transmit to a fixed bandwidth at most. If you want to upgrade your network, you must replace it with a new cable with a larger bandwidth. If we want to upgrade and transform the network of the power station, we have to replace the new equipment while rewiring - something that every manufacturer is unwilling to do. In some stations with scattered equipment, distance is also a long-standing problem that troubles engineers.

After adopting fiber optic Ethernet, some of the above problems can be fundamentally solved. In terms of transmission bandwidth, optical fiber can meet all current communication bandwidth requirements, providing a guarantee for future network upgrades of substations. In terms of distance, two types can be used: soft fiber optic cables and armored fiber optic cables. Under relatively close proximity and good environmental conditions in the computer room, soft fiber optic cables and armored waterproof tail cables can be used. Both types of cables come with fiber optic connectors, which can save the trouble of fiber fusion splicing. Especially in some remote areas where it is difficult to find welding engineering teams, using these two types of optical cables has solved many manufacturers' problems. In harsh environments and long distances, it is recommended to use armored optical cables.

Application of ME-S4048M in Substation Automation

Taking a 110KV substation in Shaoxing, Zhejiang as an example. The communication mode of the substation measurement and control device is Ethernet, and the power supply is DC 110V. However, due to differences in equipment manufacturers, there are certain differences in communication interfaces. There are three different interfaces in the network of this station: 10M optical interface, 100M optical interface, and 10/100M electrical interface.

In terms of equipment selection, the central switch uses the ME-S4048M 48 port optoelectronic hybrid switch (powered by AC/DC universal 85V-265V) produced by Shanghai Zhaoyue Communication Technology Co., Ltd. This switch can be configured with different cards to achieve any combination of three different interfaces. Due to the different number and distribution of devices at different sites, the switch achieves different functions through user configuration, avoiding the waste of ports and even devices. In the distant switch room, ME-1624RE 2 optical+24 electric intelligent switch (with the same power supply method as ME-S4048M switch) is used. By cascading 100M fiber optic cables with a 48 port switch in the central data center, both transmission distance and bandwidth are ensured. The equipment in the control room, due to its own 10M and 100M optical interfaces, is directly connected to the ME-S4048M central switch. If there are electrical interface devices, an optical fiber transceiver can be added to achieve photoelectric conversion. The workstations and monitoring stations in the host room are located close to the central switch, with minimal interference. Ordinary Category 5e twisted pair cables are used, and if necessary, 100M fiber optic network cards can be installed on the host to directly connect to the ME-S4048M central switch. ME-S4048M Product Introduction

S4048M is positioned as an industrial grade product, aimed at power users, providing fiber optic network solutions for power plant and substation automation. This series of switches has excellent overall performance and can achieve full line speed forwarding. This switch provides 100M and 10M optical interfaces, which can be plugged into single-mode or multi-mode 100M and 10M optical interface modules; The supported transmission distances are 2km (multi-mode), 20km, 40km, 60km, and 120km. Provide 48 optical interfaces or 48 electrical interfaces, with single-mode and multi-mode options for optical interfaces, and 10/100M Ethernet adaptive compatibility for electrical interfaces. At the same time, this series of switches has been specially designed for heat dissipation, with an increased operating temperature range and power supply voltage range, and enhanced resistance to voltage fluctuations and interference, thereby improving their adaptability to the usage environment. Due to the use of fiber optic technology, interference caused by strong electromagnetic induction and high voltage is avoided. And it highly concentrates the communication equipment, avoiding the hidden danger of affecting stability caused by too many devices.

The technical parameters of ME-S4048M industrial Ethernet fiber optic switch comply with IEEE 802.3u and 802.3x standards. Flow control mode: full duplex adopts IEEE 802.3x standard, and half duplex adopts Backpressure standard storage forwarding architecture, with a maximum of 48 10Base FL, 100Base FX or 10/100Base TX supports cross and direct connection automatic flipping function. Backplane bandwidth is 3.2/4.8G, 4K MAC address space buffer capacity is 2M, and each port supports address learning function and allows dynamic address aging time to be set. Dual power backup can also work simultaneously