首页>
外国专利>
Device for protecting electrical distribution network against abnormal voltages - uses voltage monitoring circuits to operate circuit-breaker, preventing reclosure for prescribed time after abnormalities disappear
Device for protecting electrical distribution network against abnormal voltages - uses voltage monitoring circuits to operate circuit-breaker, preventing reclosure for prescribed time after abnormalities disappear
In the device phase voltage (RPh/RN), transformed (2) and rectified (3), gives a 30 V DC output, which, filtered (4,7,8) and regulated (6), provides a 12 V power supply (Vcc). The transformer sec. voltage is applied (9) to paired photo-transistors (10), acting as a zero-phase detector which provides one line (11) to a NAND-gate (13). The other line (22) derives from an overvoltage detector, a subtractor (18) with associated Zener diodes (19,20). The gate output, inverted (39), drives a transistor switching unit (23,24), energising the circuit-breaker (27) operating coil (26), so interrupting the main circuit. It is also (29) applied to a NAND-gate (30) whose other input is the subtractor output, inverted (31). This gate initiates the delay unit (33) which (34,35) resets the circuit-breaker control circuit (23), provided the original overvoltage has disappeared. USE - Esp. for neutral voltage displacements.
展开▼
机译：在设备的相电压（RPh / RN）中，经过变换（2）和整流（3），可提供30 V DC输出，该输出经过滤波（4,7,8）和调节（6），可提供12 V电源（Vcc）。变压器秒将电压施加（9）到成对的光电晶体管（10），用作零相检测器，其向NAND门（13）提供一条线（11）。另一条线（22）从过压检测器得到，减法器（18）与相关的齐纳二极管（19,20）相连。反相（39）的栅极输出驱动晶体管开关单元（23，24），为断路器（27）的工作线圈（26）通电，从而中断主电路。它还（29）被应用于与非门（30），其另一个输入是减法器输出，反相（31）。该门将启动延迟单元（33），如果原始过压消失，则延迟单元（34,35）将断路器控制电路（23）复位。用途-Esp。用于零线电压位移。
展开▼
