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Description
Overview
Essential details：IRDH575B1W-435 Insulation monitoring device
Product description
The lSOMETER” of the lRDH575 series monitors the insulation resistance of unearthedpower supplies (lT systems). it is suitable for universal use in 3(N)AC, AC/DC and DC sys-tems. AC systems may include extensive Dc-supplied loads, such as converters or thyris-tor-controlled DC drives. The lRDH575 in combination with EDs4… series insulation faultlocators and the appropriate measuring current transformers is designed to set up the re.spective equipment for insulation fault location.
Function insulation monitoringWhen 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 (N/C or N/0 operation) allow a distinction to be made between’prewarning” and “alarm”. The measured value is indicated on the LC display or an exter-nally connectable measuring instrument. In this way any changes, for example when cir.cuits are connected to the system, can be recognised easily. The fault message can bestored. The fault memory can be reset by pressing the internal or external reset button.By pressing the test button, the function of the device as well as the connections to sys-tem and earth can be tested. Pressing the Info key provides additional information, suchas the existing system leakage capacitance or device settings.
IRDH575B1W-435
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IRDH575B1W-435 Insulation monitoring device
Product Description
Function insulation fault location
Insulation fault location is carried out with EDs4… series insulation fault locators and therespective measuring current transformers. when the lRDH575 detects an insulationfault, the insulation fault location process is started automatically or manually. TheIRDH575 generates a locating current the amplitude of which is dependent on the exist-ing system voltage and the insulation fault. When low-resistance insulation faults occur,the locating current is limited by the IRDH575. This limit value can be set via an appropriate menu. The locating current pulse flows from the lRDH575 via the live parts, taking theshortest path to the location of the insulation fault. From there, it flows via the insulationfault and the PE back to the lRDH575. This locating current pulse is then detected by themeasuring current transformers located in the insulation fault path, and is evaluated bythe EDS… insulation fault locators. When the locating current in the measuring currenttransformer exceeds the response value, the associated alarm LED at the EDS47… lightsup indicating the faulty subcircuit, This information is also indicated on the LC display ofthe IRDH575. By assigning the measuring current transformers to the respective circuit,the point of fault can easily be detected.
Additional functions
99 alarm messages with date and time can be stored in the data memory of the IRDH575.The device also includes lsometer disconnecting relays when several ISOMETER*s are operated in (coupled) IT systems. An integrated Rs-485 interface (BMS protocol) allows in-formation exchange with other Bender devices.Via the 0/4-20mA interface details about the insulation resistance can be transferred tohigher-level control systems.
The function of the lRDH575 is continuously monitored. When a system fault occurs, theassociated alarm LED lights up and the respective alarm relay switches.
System design
Basically, an EDS system consists of an lRDH575 and one or several EDS4… insulationfault locators with the associated measuring current transformers. Information exchangebetween the EDS4… and the IRDH575 takes place via a time and cost-saving Rs-485 in-terface. Such a system may include up to 90 EDS4… so that a total of 1080 circuits can bemonitored.
Standards
The lSOMETER” of the lRDH575 series complies with the requirements of the devicestandards: DIN EN 61557-8 (VDE 0413-8),EN 61557-8,IEC 61557-8,IEC61326-2-4,DIN EN 60664-1 (VDE 0110-1), DIN EN 60664-3, DIN EN 61557-9, VDE 0413-9, IEC 61557-9,ASTM F1669M-96 (2007),ASTM F1207M-96 (2007)
