INSULATION FAULT LOCATOR EDS151
INSULATION FAULT LOCATOR EDS151 - Image 2

INSULATION FAULT LOCATOR EDS151

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Device features
• Insulation fault location in AC, AC/DC and DC IT systems
• 6 measuring channels with measuring current transformer per EDS150/151
• Up to 528 measuring channels can be combined by the BMS bus in the IT system being monitored: 88 x 6 measuring channels
• Response sensitivity EDS150: 5 mA, EDS151: 0.5 mA
• A response time of up to 8 s in the AC system acc. to IEC 61557-9
• RS-485 interface with BMS protocol
• BMS address range 3…90
• Cyclical self test

Product Overview

Description

Product description
The insulation fault locator EDS150/151 in conjunction with the ISOMETER® IRDH575 or the locating current injector PGH, are designed for insulation fault location in unearthed power supplies (IT systems). The locating current pulse generated by the ISOMETER® IRDH575 or the locating current injector PGH are detected using the integrated measuring current transformers and evaluated by the insulation fault locators. The integration of six measuring current transformers in an EDS150/151 permits all current-carrying conductors of an outgoing line to be routed through. The response time for an alarm message inclusively indication on the respective display device is max. 8 s (e.g. MK2430/MK800).
A total of 88 EDS150/151 devices can be connected via an RS-485 interface (BMS protocol). Hence, up to 528 circuits can be monitored. Activities on the BMS bus are indicated by an alarm LED.
Application
• Insulation fault location in AC, AC/DC and DC IT systems
• DC main circuits in industrial plants, power stations and ships
• IT systems for medical locations and control circuits (EDS151)
Function
Insulation fault location is started by the ISOMETER® IRDH575 or the locating current injector PGH. Once started, the insulation fault locator EDS150/151 starts scanning all measuring channels 1…6. When the response value of 0.5/5 mA is exceeded in one of the channels, the associated alarm LED lights up. The current alarm message and the respective address and channel number will be output via the BMS interface. The faulty circuit will be shown on either an alarm and test combination or a BMS master featuring a display. If there is more than one EDS150/151, all devices will be started simultaneously. An error outputted by channel 1, for example, can be clearly assigned to the respective EDS150/151 by its BMS address.
An automatic self test monitoring the function of all measuring current transformers is carried out on an hourly basis. When a device error occurs, all alarm LEDs K1…K6 flash. The alarm status remains activated until the EDS150/151 no longer detects an insulation fault or the insulation monitoring device signals via the BMS bus that the insulation fault is eliminated. If residual currents >10 A at EDS150 resp. > 1 A at EDS151 occur on the measuring current trans formers, insulation fault location on the respective channel will be terminated and the alarm message residual current fault > 1/10 A will be outputted via the BMS bus (RCM function). The RCM function is active only during the insulation fault location process.
Standards
The ISOSCAN® EDS150/151 series complies with the requirements of the device standards:
IEC 61557-9.