D20 EME GE D20 RTU Hardware Layout

Description

The D20 chassis is a 3U horizontal slot chassis. The non-VME version of the D20 chassis is equipped with a rear-mounted termination board that provides power connection and serial port access to the D20 system. Non-VME versions of the D20 provide a single horizontal Eurocard slot, into which the D20ME board is installed.

Supported IED Protocols

The ability to acquire data from all substation Intelligent Electronic Devices (IEDs) is essential to any utilities substation automation program. GE has the largest IED protocol libraries in the industry allowing for fast and efficient integration of the following types of IEDs:

• Protection Relays
• Power Meters
• Digital Fault Recorders
• Power Quality Monitors
• Capacitor Bank Controllers
• Load Tap Changer (LTC) Controllers
• PLC

In recent years, the construction of thermal power plants has generally adopted a decentralized control system (DCS), which includes performance calculation requirements in its functional design without exception. There is no need to avoid it, as the actual application effect of this feature is often unsatisfactory. Some have even raised the possibility of canceling “performance calculation” in future DCS design. Obviously, in the pursuit of economic benefits, no homeowner can accept this suggestion. How to recognize this problem and how to solve it? This is the topic discussed in this article.

What are the issues that people are not satisfied with the performance calculation function of DCS?
Secondly, the accuracy is not sufficient. According to the functions of computers, people expect that the performance calculation of power plants should achieve high accuracy, such as achieving the accuracy required for economic accounting reports, but in reality, it has not been achieved.

Secondly, it is not possible to provide timely reference data for operating personnel, so that they can improve their operations and improve unit efficiency in a timely manner.

Thirdly, the scope of thermal efficiency calculation is often not scientific enough, making it difficult to make a timely and accurate comprehensive evaluation of the economic operation status of the unit.

The problems with DCS performance calculation are often overshadowed by other issues, such as the issue of which calculation efficiency method should be used, such as “positive balance” or “reverse balance”. However, the actual focus of the problem does not lie in this. For the convenience of discussion, here is a brief review of some basic calculation methods currently used in performance computing software, in order to provide a scientific and practical basis for the discussion of the above issues.

There are two methods for calculating boiler stove efficiency. Currently, when designing DCS in China, efficiency calculation is included in the DAS function and is provided by the DCS system supplier. When preparing bidding and tendering documents, it is often necessary to determine whether the boiler efficiency is calculated using positive or negative balance methods. We will not introduce the two specific algorithms for calculating the efficiency of positive balance and negative balance here, as they have been established for many years and are familiar to peers. We will only briefly introduce their characteristics and some problems in use in DCS systems. The basic principle of the positive balance method is to calculate the boiler efficiency by dividing the useful heat produced by the boiler (including the heat of fresh steam, reheated steam, and other useful heat directly output by the boiler that is not used by the boiler itself) by the total heat of the incoming fuel. The measurement and calculation of the useful heat produced by the boiler (referred to as Q1) are the same for both positive and negative equilibrium calculations. The problem is the calculation of the total heat of the fuel entering the furnace. The algorithm of positive balance is to directly measure the quantity of fuel entering the furnace, multiply it by the calorific value, and obtain the total heat of the fuel entering the furnace.

In the past, for a considerable period of time, the measurement of the amount of fuel fed into the furnace could generally only be carried out using methods such as coal conveyor belt scales, making it difficult to achieve timely and accurate measurement. Especially, the representativeness and timeliness of sampling in the analysis of coal entering the furnace result in significant errors. Even under good conditions for conducting thermal efficiency experiments, the standard error evaluation is still close to 2%. Under operating conditions, the measurement error is particularly greater than this value. Therefore, even now, for combustion systems with intermediate coal powder silos, using positive balance to calculate efficiency and measure the quantity of coal entering the furnace is still a significant challenge.

Description
D20ME (VME) 2M FLASH, 512kNVRAM, 1.5M SRAM
D20ME II w RS232/485 (VME) 2M FLASH, 512kNVRAM, 1.5M SRAM
U EMPTY SLOT WITH COVER PLATE
D20ME (VME) 2M FLASH, 512kNVRAM, 1.5M SRAM
D20ME II w RS232/485 (VME) 2M FLASH, 512kNVRAM, 1.5M SRAM
D20 EME ETHERNET MEMORY, 0MB KIT
D20 EME ETHERNET MEMORY, 8MB KIT
D20 EME ETHERNET MEMORY, 16MB KIT
D20 EME 8MB MEMORY CARD KIT (No Ethernet)
D20 EME 16MB MEMORY CARD KIT (No Ethernet)
D20 EME2 8MB MEMORY CARD
D20 EME2 ETHERNET MEMORY, 16MB KIT
D20ME (VME) 2M FLASH, 512kNVRAM, 1.5M SRAM
D20ME II w RS232/485 (VME) 2M FLASH, 512kNVRAM, 1.5M SRAM
D20 EME ETHERNET MEMORY, 0MB KIT
D20 EME ETHERNET MEMORY, 8MB KIT
D20 EME ETHERNET MEMORY, 16MB KIT
D20 EME 8MB MEMORY CARD KIT (No Ethernet)
D20 EME 16MB MEMORY CARD KIT (No Ethernet)
D20 EME2 8MB MEMORY CARD
D20 EME2 ETHERNET MEMORY, 16MB KIT
D20 EME ETHERNET MEMORY, 8MB KIT
D20 EME ETHERNET MEMORY, 16MB KIT
D20 EME 8MB MEMORY CARD KIT (No Ethernet)
D20 EME 16MB MEMORY CARD KIT (No Ethernet)
D20 EME2 8MB MEMORY CARD
D20 EME2 ETHERNET MEMORY, 16MB K