| 摘要 |
FIELD: measuring equipment.SUBSTANCE: invention relates to electrical measurement and can be used to assess suitability of newly developed electricity meters against uncontrolled power take-off from power grids. Device for inductive electric meters testing contains in bridge circuit branches storage capacitors of same capacity, which outputs on one side are connected to grid phase and zero conductors, and on the other side is to discharging circuit series-connected thyristor and throttle arranged in bridge diagonal circuit. At that, in series with storage capacitors charging circuits power diodes and thyristors are included connected to grid zero and phase conductors. Charging circuits thyristors are switched on automatically due to resistors connected between said thyristors anode and control electrode and are switched off automatically according to storage capacitors charge in the end of supply voltage periods first quarter. Thyristor discharge circuit in bridge layout diagonal circuit is activated after complete charge of bridge layout storage capacitors in mains voltage second quarter-periods using control device, consisting of connected to bridge circuit diagonal integrating circuit from series-connected controlled limiting resistance and control capacitor, connected to step-down transformer primary winding via dinistor. Said primary winding is shunted by extra current damping diode, and one of transformer three secondary windings is connected to bridge layout discharge circuit thyristor “control electrode-cathode” transition through low-value resistor. Elimination of charging circuits thyristors automatic switching on during discharge circuit thyristor switching on is achieved by means of circuits, including connected to charging circuits “control electrode-cathode” thyristors transitions in series connected stabilizer diode, transformer additional secondary winding and communication capacitor shunted by discharge resistor.EFFECT: significant simplification of thyristors control device and elimination of secondary power supply source when executing device by single-period charge-discharge scheme of storage capacitors.1 cl, 6 dwg |
