| 摘要 |
The invention relates to field of diagnostics and enforcement of for low-voltage electrical network in order to meet specification requirements of fire security. A method for diagnostics of low-voltage electrical networks comprises measurement of current of load being controlled with following calculation of an analog value of high-voltage oscillations, which is compared to the rated value, conversion of high-voltage oscillations analogue value to digital form, using said value the signals as to level of fire security are shaped; moreover, the detected high-voltage oscillations are compared to 50 Hz industry frequency; thereafter, digital indication of the shaped signals as to level of fire security is performed, if fire security reaches 3-5 level in addition sound indication is made; thereafter a section of load being controlled is disconnected, until the level of fire security will decrease to 1-2 level; the disconnected section is inspected to find an improper conductor joining or defective electric connections. A device for method implementation of the method comprises a load current sensor, a power unit, moreover comprises a unit for allocation of high-quality harmonic components, which is connected to the secondary winding of the load current sensor and to output of which a unit for fire security signals of low-voltage electrical network is connected, whose output is connected to the digital indication unit and sound warning unit. All units are connected to the power unit. Employing the method of diagnostics for low-voltage electrical network using new s via control of thereof fire security provides control of wiring and electric connections quality. |
