Battery Energy Storage System

Electrical Safety for Battery Energy Storage Systems (BESS)

Why Choose a Grounded or Ungrounded Solution for BESS?

Battery Energy Storage Systems (BESS) are used to store power (often from a renewable source) for later use during a critical time. The benefits of these systems include cost savings, clean energy, and reducing downtime. It is vital that the electrical integrity of the systems are properly monitored to maintain the benefits.

Ungrounded BESS

BESS most commonly operate as ungrounded systems, which mean all line conductors are intentionally isolated from ground. Although these systems can continue to operate with a single ground fault, it is vital to indicate and clear the first fault as quickly as possible. If the fault is not cleared, a second fault develops and a line-to-line short will occur. Bender’s insulation monitoring devices (IMDs) will give advanced notice of a first fault condition which allows for time to properly identify and clear the fault before a catastrophic issue arises. Bender offers a wide range of IMDs for virtually all size BESS, from small-scale deployments to large-scale, utility grade systems.

Grounded BESS

Most BESS operate via an ungrounded system design, however there are grounded installations that must have proper ground fault protection to operate safely. These systems can be grounded on the + or – battery line, or at the neutral connection point on the inverter. It is critical to monitor for ground faults at low leakage current levels to detect and clear issues before they trip a protection device and/or damage the batteries. Bender’s residual current monitors are able to detect low level AC and DC grounds faults to indicate minor issues before they become major issues, such as equipment fires or system shut downs.

Minimize System Downtime
Electrical issues can be detected and located while keeping the installation fully energized.

Automatically Locate Faults
Automatic fault location provides remote diagnostic tools which eliminates the need to have technicians on site during the fault.

Increase Safety
Ground-fault location at packs and modules minimizes battery fire risk (with quick repair).

Reduce Maintenance Costs
Significant decrease in maintenance costs due to the accuracy of detection and decreased need for human interaction with the system.

Downloads

CategoryNameSizeLanguageTimestampD-/B-Number
Product Overviews ISOMETER®/ISOSCAN® 3.7 MB EN2022/05/25 08:08:1025.05.2022 08:08:10
Product Overviews Residual Current Monitoring 2.2 MB EN2022/05/24 12:26:4924.05.2022 12:26:49
Product Overviews Overview Brochure 4.2 MB EN2022/08/25 20:30:5725.08.2022 20:30:57
Technical Article Electrical Safety in Control and Auxiliary Circuits 632.6 KB EN2019/05/13 10:29:2213.05.2019 10:29:22
Flyers Battery Energy Storage Systems Flyer 2.5 MB EN2021/04/21 16:18:1021.04.2021 16:18:10
Technical Information Insulation Fault Location 112.4 KB EN2019/05/13 10:29:2213.05.2019 10:29:22

Products

Ground-Fault Monitoring, Ungrounded

ISOMETER® isoPV425 mit AGH420
ISOMETER® isoPV425 with AGH420

Ground-fault monitoring device for photovoltaic systems up to AC 690 V/DC 1000 V

ISOMETER® iso685…
ISOMETER® iso685 Series

Ground-fault detector for ungrounded AC/DC systems

ISOMETER® isoPV1685/isoPV1685PFR
ISOMETER® isoPV1685 Series

Ground-fault monitoring device for DC systems up to 1500 V in photovoltaic systems

ISOMETER® iso1685DP-425/isoHV1685D-425/isoLR1685DP-325
ISOMETER® iso1685DP/isoHV1685D/isoLR1685DP

Insulation monitoring device for unearthed AC, AC/DC and DC power supplies (IT systems)

ISOMETER® isoNAV685-D
ISOMETER® isoNAV685-D

Ground-fault monitoring device with instantaneous tripping, frequency nominal system voltage 60 Hz

ISOMETER® iso685-…-P
ISOMETER® iso685-…-P

Ground-fault monitoring device for demanding applications, variant with integrated system isolating switches and locating current injector

Ground-Fault Monitoring for Grounded Systems

LINETRAXX® SmartDetect RCMS410

Four-channel DC, AC and pulse current sensitive residual current monitor for earthed AC, AC/DC and DC systems

LINETRAXX® RCMS460-D
LINETRAXX® RCMS460-D Blindspot®

Multi-channel AC/DC ground-fault monitor

LINETRAXX® RCMS490-D
LINETRAXX® RCMS490-D Blindspot®

Multi-channel AC/DC ground-fault monitor with individual relay outputs

LINETRAXX® RCMB300-Serie
LINETRAXX® RCMB300 Series

AC/DC sensitive residual current monitoring modules for monitoring applications

Ground-Fault Location, Ungrounded

ISOSCAN® EDS440
ISOSCAN® EDS440 Series

Ground-fault location module for ungrounded AC/DC systems

Healthcare Isolated Power Panels

COM465IP Series
COM465IP Series

Condition Monitor with an integrated gateway for the connection of Bender devices to Ethernet-TCP/IP networks

Ground-Fault Monitoring, Ungrounded

ISOMETER® isoPV425 mit AGH420
ISOMETER® isoPV425 with AGH420

Ground-fault monitoring device for photovoltaic systems up to AC 690 V/DC 1000 V

Details
ISOMETER® iso685…
ISOMETER® iso685 Series

Ground-fault detector for ungrounded AC/DC systems

Details
ISOMETER® isoPV1685/isoPV1685PFR
ISOMETER® isoPV1685 Series

Ground-fault monitoring device for DC systems up to 1500 V in photovoltaic systems

Details
ISOMETER® iso1685DP-425/isoHV1685D-425/isoLR1685DP-325
ISOMETER® iso1685DP/isoHV1685D/isoLR1685DP

Insulation monitoring device for unearthed AC, AC/DC and DC power supplies (IT systems)

Details
ISOMETER® isoNAV685-D
ISOMETER® isoNAV685-D

Ground-fault monitoring device with instantaneous tripping, frequency nominal system voltage 60 Hz

Details
ISOMETER® iso685-…-P
ISOMETER® iso685-…-P

Ground-fault monitoring device for demanding applications, variant with integrated system isolating switches and locating current injector

Details

Ground-Fault Monitoring for Grounded Systems

LINETRAXX® SmartDetect RCMS410

Four-channel DC, AC and pulse current sensitive residual current monitor for earthed AC, AC/DC and DC systems

Details
LINETRAXX® RCMS460-D
LINETRAXX® RCMS460-D Blindspot®

Multi-channel AC/DC ground-fault monitor

Details
LINETRAXX® RCMS490-D
LINETRAXX® RCMS490-D Blindspot®

Multi-channel AC/DC ground-fault monitor with individual relay outputs

Details
LINETRAXX® RCMB300-Serie
LINETRAXX® RCMB300 Series

AC/DC sensitive residual current monitoring modules for monitoring applications

Details

Ground-Fault Location, Ungrounded

ISOSCAN® EDS440
ISOSCAN® EDS440 Series

Ground-fault location module for ungrounded AC/DC systems

Details

Healthcare Isolated Power Panels

COM465IP Series
COM465IP Series

Condition Monitor with an integrated gateway for the connection of Bender devices to Ethernet-TCP/IP networks

Details

Standards

NEC 706.30(D)
UL 9540:2020 Section 14.8