Manufacturing a low profile current measurement connector

Patent metadata

Field	Value
Publication number	US-10145866-B2
Application number	US-201514856988-A
Country	US
Kind code	B2
Filing date	Sep 17, 2015
Priority date	Feb 12, 2014
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

Abstract

A current measurement connector may include a first part and a second part. Each part may include a mount and a joint. The first and second part may be joined via the respective joints through a current transformer interposed between the first and second parts. The respective mounts may be configured to receive a current from a current source and pass the received current through the current transformer via the first and second parts inducing a current in the current transformer. The induced current may be useable to measure the current from the current source. Methods for fabricating the current measurement connector may include die casting the first and second parts and press fitting the first and second parts at the respective joints through the current transformer. Methods for use may include withstanding a fault current pulse and dissipating heat associated with the pulse via the first and second parts.

First claim

We claim:

1. A method for manufacturing a current measurement connector, the method comprising:
casting a first part of the current measurement connector, wherein the first part comprises:
a first mount; and
a first joint;

casting a second part of the current measurement connector, wherein the second part comprises:
a second mount; and
a second joint; and

joining the first part and the second part via the first and second joints through an opening of a current transformer interposed between the first part and the second part, thereby electrically coupling the first mount to the second mount, wherein the first mount and the second mount are configured to receive a first current from a current source;
wherein the current measurement connector is configured to pass the first current through the first and second joints thereby inducing a second current in the current transformer, wherein the second current is useable to measure the first current.

2. The method of claim 1 , wherein the first part further comprises:
one or more soldering pins, wherein the one or more soldering pins are configured to mount via a wave soldering process to a printed circuit board via through holes disposed in the printed circuit board.

3. The method of claim 2 , wherein the first part is not electrically coupled to the printed circuit board.

4. The method of claim 1 , wherein the first part further comprises one or more soldering pins, the method further comprising:
mounting, via a wave soldering process, the one or more soldering pins to a printed circuit board via through holes disposed in the printed circuit board.

5. The method of claim 4 , wherein the first part is not electrically coupled to the printed circuit board.

6. The method of claim 1 , wherein said joining further comprises:
interposing a spacer between the first mount and the second mount, wherein the spacer is configured to:
isolate the first mount and second mount from mechanical vibration; and
prevent an alternative electrical coupling between the first mount and second mount.

7. The method of claim 1 , further comprising:
plating the first part and the second part with tin, wherein the tin prevents galvanic corrosion of the first and second mounts.

8. The method of claim 1 , wherein the first part and the second part are die cast from one or more of zinc, aluminum, or copper.

9. The method of claim 1 , wherein the second part is physically separate and distinct from the first part, and wherein the first part and the second part physically connect together at and via respective cold-forming joints and extend through the opening of the current transformer interposed between the first and second parts.

10. The method of claim 1 , wherein the current measurement connector is able to withstand fault current pulses of at least approximately one thousand two hundred and fifty amperes for at least approximately one cycle, thereby protecting the current transformer from damage.

11. The method of claim 1 , wherein the current measurement connector is able to dissipate heat associated with fault current pulses of at least approximately one thousand two hundred and fifty amperes for at least approximately one cycle, thereby protecting the current transformer from damage.

12. The method of claim 1 , wherein, when connected, the first joint and the second joint implement at least a portion of a primary coil.

13. The method of claim 1 , further comprising:
electrically coupling, via a first threaded fastener, the first mount to a first wire lug; and
electrically coupling, via a second threaded fastener, the second mount to a second wire lug;
wherein the first wire lug and the second wire lug are electrically coupled to the current source.

14. The method of claim 1 , wherein the first joint is a first cold-forming joint, wherein the second joint is a second cold-forming joint, and wherein said joining further comprises press fitting the first part and the second part via the first cold-forming joint and the second cold-forming joint.

15. The method of claim 1 , further comprising:
applying, after said joining, an overmold, wherein the overmold:
encapsulates the first parts and the second part connected through the current transformer;
electrically isolates the current measurement connector;
thermally insulates the current measurement connector; and
mechanically isolates the current measurement connector from mechanical vibration.

Assignees

• Nat Instruments Corp

Inventors

• Pasternak David R

Classifications

• G01R3/00

  Apparatus or processes specially adapted for the manufacture {or maintenance} of measuring instruments {, e.g. of probe tips} · CPC title

• H01R43/24

  Assembling by moulding on contact members · CPC title

• G01R15/18

  using inductive devices, e.g. transformers · CPC title

• G01R1/44

  Modifications of instruments for temperature compensation · CPC title

• H01R13/504 Primary

  different pieces being moulded, cemented, welded, e.g. ultrasonic welding, or swaged together · CPC title