The electricity meter load simulator is designed for preliminarytesting of the operation of electricity meters connected indistributors.
The testing is performed when the electricity meter is connected in the standardmanner, with a live distribution point. Once contact is made, the SZE-12 ispowered via the electricity meter under test (it has no internal power supply). Itforces a test current of approximately 8A into the current circuit of the electricitymeter. The exact value depends on the fluctuations of the mains voltage andon the level of contact resistance between the SZE-12 current terminals andthe electricity meter current terminals. The SZE-12 is designed for 230V / 50Hznominal voltage but it can also be used to test electricity meters connected to120V / 50Hz mains – however, in such a case, the simulated load current isreduced by about half. The output circuit is protected with a 16A fuse, whichdoes not melt during normal operation. For the electricity meter to show a0.1kWh reading, the SZE12 must be connected for approximately 2.5 minutes.The test duration may be shorter in the case of electronic electricity metersindicating start-up with a blinking arrow or featuring a bar-graph showing theapproximate output. During longer or repeated measurements, the simulatorcould overheat and trigger the resettable thermal protection. Until the devicecools down, the simulator appears to be inoperative. The maximum operatingtime at maximum output power is 3 minutes. After that, the device must remainunconnected for 10 minutes (the time necessary for the device to cool down).Once cooled down, the SZE-12 can operate properly again. The load simulatoris certified as CAT IV equipment in accordance with CSN EN 61326-1 and CSNEN 61010-1 ed. 2.