IRDH275B-427 绝缘监测设备组合

Product description
The device combination ISOMETER* IRDH275BM-7 and the coupling device AGH6755-7or the coupling devices AGH6755-7MV15 is designed to monitor the insulation resistanceof unearthed medium voltage systems (lT systems). lt is suitable for universal use in 3AC,combined AC/Dc and DC systems.AC systems may include extensive DC-supplied loads. The AMPplus measurement methodmeets the particular requirements of modern power supplies which often include rectifiers,converters, thyristor-controlled DC drives and directly connected DC components. Takingthe system leakage capacitances into account, the IRDH275BM-7 automatically adaptsitself to the existing system conditions in order to optimise the measuring time.
Application
.AC,DC or AC/DC medium voltage systems.AC/DC medium voltage systems with directly connected DC components, such asrectifiers, converters, and thyristor-controlled DC drives
Function
When the insulation resistance between the system conductors and earth falls below theset response value, the alarm relays switch and the alarm LEDs light up. Two separatelyadjustable alarm relays allow to distinguish between prewaming and alarm. The measuredvalue is indicated on the LC display or an externally connectable measuring instrument.The fault message can be stored. The fault memory can be reset by pressing the reset button.By pressing the test button, the function of the device as well as the connections to earthcan be tested. Pressing the Info button provides additional information, such as the existingsystem leakage capacitance or device settings. The function of the earth connections aremonitored. When a fault occurs, the system fault relay switches and the alarm LED “systemfault” lights up.
The parameterisation of the device can be carried out via the LC display or the functionbuttons integrated in the front plate.
In addition, the device features:
. History memory with real-time dock to store all alarm messages with date and time stamp.Electrically isolated RS-485 interface (BMS protocol) for communication with otherBender devices
Current output 0(4)…20 mA (electrically isolated)