GE IC800SSI228RD2-CE自动化模块
大多数系统在满载时使用6.0 Vdc的负载增益电压。到在低于满载的情况下执行此步骤，使用负载增益与所用负载百分比成比例的电压值。对于例如，如果满载时的负载增益电压为6.0 Vdc，则在50%负载下，调整负载增益电压为3.0 Vdc。
操作说明介绍
这些2301A型号的速度和负荷分担部分监控和控制两个功能。
•速度：速度控制部分将原动机保持在正确的位置速度
•两台或多台发电机并联运行期间的负荷分配，以及负载分担部分感测其发电机承载的负载，并导致系统中所有发电机的负荷按比例分配。
速度控制
图4-1所示的速度控制系统包括：
•感应原动机速度的装置（1）
•频率-电压转换器（2）
•可与原动机速度进行比较的速度基准（3）
•速度加法器/放大器（4），其输出与在任何给定负载下保持所需速度所需的燃料或蒸汽
•致动器（5），用于定位原动机的燃料或蒸汽机构速度感测装置（如磁性拾取器）感测并将其转换为频率与原动机速度。
频率-电压转换器接收来自转速传感器的交流信号并将其改变成比例直流电压。
速度参考电路产生直流“参考”电压，与速度信号电压进行比较。参见伍德沃德手册82510，磁性拾取器&
电子控制的接近开关，有关磁性的更多信息皮卡。
在求和时，将速度信号电压与参考电压进行比较指向如果速度信号电压低于或高于参考电压，则信号由控制放大器发送，要求增加或减少速度执行器通过重新定位来响应来自控制放大器的信号燃料或蒸汽架，改变原动机的速度，直到速度信号电压和参考电压相等。
故障转速信号电路监控转速信号输入。当没有信号时检测到，需要最低燃油。最小燃油信号足以导致：如果不受限制，执行器将转到最小位置。然而，由于外部系统中的连杆调整或其他限制，最小执行机构
该位置可能不允许原动机停机。
*—Most systems use a Load Gain Voltage of 6.0 Vdc at full load. To
perform this procedure at less than full load, use a Load Gain
Voltage value that is proportional to the percent load used. For
example, if the Load Gain Voltage at full load is 6.0 Vdc, you would
adjust for a Load Gain Voltage of 3.0 Vdc at 50% load.
Chapter 4.
Description of Operation
Introduction
The speed and load sharing section of these 2301A models monitors and
controls two functions.
• Speed—The speed control section keeps the prime mover at the correct
speed.
• Load Sharing—During parallel operation of two or more generators, the
load sharing section senses the load carried by its generator and causes the
loads of all generators in the system to be shared proportionally.
Speed Control
The Speed Control system as shown in Figure 4-1 consists of:
• a device (1) to sense the speed of the prime mover
• a Frequency to Voltage Converter (2)
• a Speed Reference (3) to which the prime mover speed can be compared
• A Speed Summer/Amplifier (4) with an output proportional to the amount of
fuel or steam required to maintain the desired speed at any given load
• An Actuator (5) to position the fuel or steam mechanism of the prime mover
A speed-sensing device, such as a magnetic pickup, senses the speed of the
prime mover, and converts it to an ac signal with a frequency proportional to
prime-mover speed.
The frequency-to-voltage converter receives the ac signal from the speed sensor
and changes it to a proportional dc voltage.
A speed-reference circuit generates a dc “reference” voltage to which the speedsignal voltage is compared. See Woodward manual 82510, Magnetic Pickups &
Proximity Switches for Electronic Controls, for more information on magnetic
pickups.
The speed-signal voltage is compared to the reference voltage at the summing
point. If the speed-signal voltage is lower or higher than the reference voltage, a
signal is sent by the control amplifier calling for an increase or decrease in
speed.
The actuator responds to the signal from the control amplifier by repositioning the
fuel or steam rack, changing the speed of the prime mover until the speed-signal
voltage and the reference voltage are equal.
A failed-speed-signal circuit monitors the speed-signal input. When no signal is
detected, it calls for minimum fuel. The minimum-fuel signal is sufficient to cause
the actuator to go to the minimum position if not restricted. However, due to
linkage adjustment or other restrictions in the external system, minimum actuator
position may not permit prime-mover shutdown.
