Modular electronic meter having reduced width

• US 5,317,250 A
• Filed: 01/09/1992
• Issued: 05/31/1994
• Est. Priority Date: 01/09/1991
• Status: Expired due to Fees

• Current Assignee: Zellweger Uster AG (Toyota Motor Corporation)
• Original Assignee: Zellweger Uster AG (Toyota Motor Corporation)
• Inventors: Warmerdam, Petrus
• Primary Examiner(s): Strecker, Gerard R.
• Application Number:
  US07/818,676
• Time in Patent Office: 873 Days
• Field of Search: 324/97, 324/113, 324/114, 324/142, 324/149, 324/156, 324/157, 361/364, 361/365, 361/369, 361/372, 361/393, 361/394
• US Class Current: 324/156
• CPC Class Codes: G01R 1/04 Housings; Supporting members; Arrangements of terminals
• CPC Class Codes: G01R 21/00 Arrangements for measuring electric power or power factor G01R7/12 takes precedence

Abstract

A flat, modular measuring circuit having two connecting terminals for one phase of load current and a current sensor connected thereto. The two connecting terminals are arranged one above the other on one of the end faces of the module. This configuration leads to a significant reduction in the meter width and to a reduction in the production costs, since these modules can also be cost effectively produced in increased quantity and used for multi-phase meters.

Claims

1. Electronic electricity meter of modular structure comprising:

a box-like housing having a plurality of modules, each of said modules performing different functions and being interconnected to form a module stack, at least one of the modules being a measuring circuit for measuring a load current;

means attached to said box-like housing for holding said module stack within the box-shaped housing, the measuring circuit being a three-dimensional box-shaped module having first, second and third dimensions representing a length, a height and a width, respectively of said measuring circuit, said length being defined by a first separation distance between first and second opposing end faces of said measuring circuit and said width being defined by a second separation distance between third and fourth opposing end faces located perpendicular to said first and second end faces, said height being greater than said width, said measuring circuit further including;

two connecting terminals for detecting a single-phase load current, said two connecting terminals being arranged one above the other along an axis parallel to said height of said measuring circuit and being exposed on said first end face of said measuring circuit; and

a current sensor which is connected to said connecting terminals.

2. Electricity meter according to claim 1, wherein the two connecting terminals are located vertically one above the other along said first end face, said first end face comprising a first portion wherein one of said two connecting terminals is exposed on said measuring circuit, and a second portion wherein another of said two connecting terminals is exposed on said measuring circuit, said first and second portions being offset different distances from said second end face.

3. Electricity meter according to claim 2, wherein the measuring circuit further includes:

ribs and slots located on an exposed surface of the measuring circuit module for engagement with corresponding slots and ribs of other modules.

4. Electricity meter according to claim 3, wherein said at least one of said plurality of modules includes:

a neutral module for structural interconnection with the measuring circuit module.

5. Electricity meter according to claim 4, further including:

a plurality of additional modules for structural interconnection with the measuring circuit module in said box-shaped housing.

6. Electricity meter according to claim 5, wherein all of said plurality of modules are of similar shape, each module further including:

a fixing rib on one end surface and a fixing slot on another end surface for structural interconnection with adjacent modules in the box-shaped housing.

7. Electricity meter according to claim 6, wherein all of said plurality of modules of the electricity meter are plugged together to form said module stack, said holding means of said electricity meter further including:

means for retaining the module stack in the box-shaped housing.

8. Electricity meter according to claim 7, wherein the retaining means includes:

mounting rails into which the module stack is interconnected.

9. Electricity meter according to claim 6, wherein at least some of the plurality of additional modules consist of:

a base part; and

a printed-circuit board supported by the base part.

10. Electricity meter according to claim 8, further including:

blanking parts shaped similar to the plurality of additional modules for matching a total width of the module stack to a distance between the mounting rails of the retaining means.

11. Electricity meter according to claim 6, wherein said plurality of additional modules further includes:

a switching relay triggered by a ripple-control receiver.

12. Electricity meter according to claim 6, wherein said plurality of additional modules further includes:

a tariff module structurally interconnected with said measuring circuit module in the electricity meter for providing external tariff or period control.

13. Electricity meter according to claim 6, wherein said plurality of additional modules further includes:

pulse transferring contacts for transferring measuring pulses and/or control pulses.

14. Electricity meter according to claim 6, wherein said plurality of additional modules further includes:

an interface for remote reading of the meter.

15. Electricity meter according to claim 6, wherein said plurality of additional modules further includes:

a customer-specific module for connection of external meter pulses.

16. An electronic meter for measuring single phase or multi-phase current comprising:

a box-shaped housing having a lower part which includes at least one slot and one rail for receiving one or more single phase current measuring modules;

at least one current measuring module, said current measuring module further including;

an exterior formed with at least one rib and one slot for engagement with said at least one slot and rail, respectively of said box-shaped housing to position the measuring module in the box-shaped housing; and

two connecting terminals for establishing a current path with a current sensor to connect the measuring module with one phase of a load current to be measured, said connecting terminals being exposed on a two-dimensional end surface of said exterior of said measuring module, and being arranged next to one another along an axis parallel to a first dimension of said two dimensional end surface, wherein said first dimension of said end surface is greater than a second dimension of said end surface, said connecting terminals having a cross-section matched to an intensity of current to be measured when said measuring module is placed in said box-shaped housing.

17. An electronic meter according to claim 16, further comprising:

a plurality of measuring modules identical to said at least one measuring module, said plurality of measuring modules and said at least one measuring module each including a rib and slot configuration for interlocking said plurality of measuring modules and said at least one measuring module in said box-shaped housing.