Meter Carrier Board with Internal Cable Ducts for EMI Reduction
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Solution Overview
Problem
Existing meter carrier boards do not allow for the routing of cross-wiring data cables and voltage supply wires within the meter cabinet, leading to potential counting errors and electrical disturbances due to electromagnetic fields, and they do not facilitate lateral interconnection of multiple metering devices as per DIN 43870 and VDE 0603-100 standards.
Innovation Solution
A meter carrier board with a three-point mount and integrated closed cable ducts for routing cables internally, including a central and lateral cable duct, which protects cables and allows for lateral interconnection of metering devices, while being compliant with the mentioned standards, reducing electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cables are routed behind the meter carrier board on the rear side, then installation is simple, but electromagnetic interference causes counting errors and electrical disturbances
Solution Approach 1:
The cable routing path is segmented into separate channels: a first cable duct for voltage supply cables and a second cable duct for data cables. This segmentation isolates different cable types to prevent electromagnetic interference while maintaining organized routing within the meter carrier board structure.
Solution Approach 2:
The patent introduces an intermediary shielding structure between the voltage supply cables and data cables. This intermediary element blocks electromagnetic fields from reaching sensitive data cables, preventing counting errors while allowing both cable types to coexist within the same carrier board.
2Reliability
If meter carrier boards are designed with standard three-point mount only, then compliance with DIN 43870 is maintained, but lateral interconnection of multiple metering devices is not enabled
Solution Approach 1:
The meter carrier board is designed with multi-functionality: it maintains the standard three-point mount for vertical mounting compliance with DIN 43870, while simultaneously incorporating lateral cable ducts and opening arrangements that enable lateral interconnection of multiple metering devices. This universal design satisfies both regulatory requirements and future-proof connectivity needs.
Solution Approach 2:
The patent adds a lateral dimension to the traditionally vertical-only cable routing. By incorporating lateral cable ducts and openings in the side walls, the design enables cable routing in a second dimension (lateral direction), allowing interconnection between adjacent metering devices without compromising the vertical three-point mount structure.
3Ease of operation
If cross-wiring data cables and voltage supply wires are routed outside the meter carrier board, then cable management is simplified, but counting errors and electrical disturbances occur
Solution Approach 1:
The cable ducts are nested within the meter carrier board structure itself. The first and second cable ducts are integrated into the board's housing, with openings provided in the side walls for cable entry. This nesting approach simplifies cable management by providing dedicated channels within the board while protecting cables from external electromagnetic interference that would affect metering accuracy.
Data Source
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AI summary
A meter carrier board (1) for mounting a metering device (14) in a meter cabinet, wherein said carrier board (1) comprises a three-point mount (10) with at least a first vertically extending slotted hole (10a) and at least one laterally slotted hole (10b) which are adapted to receiving fastening bolts for mechanically coupling said metering device (14) to the front side of said meter carrier board (1), is characterized in that said board (1) is composed of a housing (2) having two opposing side walls (2a) and a front panel (6) carrying said three-point mount (10), said front panel (6) comprising an opening (12) and being adapted to be firmly coupled to said housing (2) by fastening elements (8, 24, 24a, 24b); wherein a central cable duct (16) and a lateral cable duct (20) are formed inside said housing (2), said lateral cable duct (20) running in a direction perpendicular to the direction of said central cable duct (16) and communicating with a lateral opening (22) which is formed in at least one of said side walls (2a), wherein said lateral opening (22) is covered by a removable cover (22a), and wherein said lateral cable duct (20) communicates with said opening (12) in said front panel (6) and is adapted to route metering and/or data cables from said metering device (14) to said lateral opening (22) in said side wall (2a). The invention is further related to a distribution cabinet or switch gear cabinet including such a meter carrier board (1).