保护继电器的代码表（Code list of protective relays）.docVIP

保护继电器的代码表（Code list of protective relays） Serial device comparison table Serial number DEVICE device action 2 time-delay starting or closing relay delay starting or closing relay function is at any time before or after switching program or protective relay system to provide the desired amount of time delay 3 Checking or interlocking relay check or interlock relay in the device, reflect the other components of the working position or some predetermined condition element can be used to determine whether a work program to continue or stop, or for some components of the working position and the predetermined condition check. 4 master contactor master contactor is a component controlled by component 1 and its equivalent components, intermediate relays and protective elements. The work is to switch on or off the necessary control loops so that the equipment is put into operation under specified conditions, or that it is out of operation under other conditions and conditions. 21 distance relay distance relay, a relay that moves when the admittance, impedance, or reactance of a loop changes or exceeds a predetermined value. 25 synchronizing or synchronism-check relay synchronizing or synchronism check relay synchronization device provides an output which makes the two loop closed at zero phase difference, it is not necessarily the voltage and speed control. A simultaneous check relay makes the two circuits parallel to the prescribed voltage, phase difference, and frequency. 27 under voltage relay undervoltage relay element operated when the voltage drops to a given value. The 30 annunciator relay signal relay is a non automatic resetting device. It gives an intuitive display when the protective element is operated, and the locking function can be completed 32 directional power relay power directional relay is a desired value of the action of power flow in a given direction, such as the engine power and the loss of the original into reverse power motor operation result 37 un