Product Introduction
F144-SM Synchronization Indicator with Parallel Operation Command 1. The F96/F144-SM synchronous pulse type synchronous indicator is mainly used for detection and indication when multiple units are connected to the grid in various power plant systems. It can issue a parallel operation command at a certain set time before the frequency difference is less than a certain set value and the phase difference is zero, so as to realize automatic grid connection.
Specifications
F144-SM Synchronization Indicator with Parallel Operation Command
1. The F96/F144-SM synchronous pulse type indicator is mainly used for detection and indication when multiple units are connected to the grid in various power plant systems. It can issue a parallel operation command at a set time before the frequency difference is less than a certain set value and the phase difference is zero, thus achieving automatic grid connection.
2. There are two sets of setting switches on the back of the instrument. Their functions are as follows:
Lead Time Setting Switch (S1): This is a four-bit binary setting switch. The relationship between the lead time and the setting is shown in the table. The function of the setting is mainly to balance the delay time of parallel operation and closing of each stage of the tandem switch. The user should determine this based on the relevant data of the system composition or through system debugging. The instrument is set to 110 milliseconds at the factory.
Frequency difference interlock setting switch (S2): This group is also a four-bit binary setting switch. The frequency difference interlock range and its relationship are shown in the table. This group setting is mainly to determine the frequency difference setting range for the parallel operation command. Only within the frequency difference interlock setting range can the parallel operation command take effect, and the green indicator light at the 12 o'clock position (i.e., the closing indicator light) will light up when the phase difference crosses zero. Users can set it themselves as needed. The instrument is set to 0.2Hz at the factory.
3. During grid parallel operation debugging, if it is necessary to adjust the lead time and frequency difference interlock range, the new setting should be made in the power-off reset state; otherwise, the new setting value will not be recognized. After adjustment, it can be used after power-on. The wiring terminals on the back of the instrument function as follows:
a. Terminals 3(7) and 4(3) are connected to the grid signal, and terminals 1(5) and 9(1) are connected to the generator signal.
b. Terminals 5 (11) and 6 (12) are for experimental requests. Their main function is to test the parallel operation command function when the instrument receives the same grid signal from both input terminals. In this case, the red indicator light at the 12 o'clock position on the instrument is constantly lit, indicating that the phase difference between the two signals is zero. If terminals 5 (11) and 6 (12) are short-circuited at this time, the red indicator light will flash, and the green synchronous closing indicator light will light up once every 5 seconds, simultaneously issuing a closing command signal.
Precautions
1. To prevent phase errors between the two input voltages, especially ensuring that the grid signal terminal and the parallel signal terminal correspond, it is recommended that the distribution board be equipped with a parallel operation synchronization indicator light (e.g., by turning off the light). This serves to check the wiring of the synchronization indicator and can also be used as a backup for temporary manual parallel operation.
2. For F96/F144-SM, before use, check that the instrument wiring is correct and connect a switch SB1 in series in the closing command output circuit to prevent misoperation. When operating the speed control switch, the generator unit to be paralleled should be gradually and slowly brought closer to the grid frequency to enter the frequency difference interlocking range. At this time, the closing indicator light will illuminate when the phase difference crosses zero, indicating that the paralleling state has been entered. When the SB1 switch is pressed, a closing command can be issued to implement the paralleling. When used in a multi-generator system, the transfer switch contacts of the input signals from each generator to the synchronizing meter should be interlocked.
