AND WIRE ALIKE ADAPTATION OF EXISTING PLATFORM HARDWARE MODULES INTO NEW PRODUCTS

[0001] FIELD

[0002] The invention relates to intelligent Electronic Devices (IED) and, more particularly, to the integration of state of the art IED hardware modules and/or printed circuit boards into an existing wiring and form factor environment.

[0003] BACKGROUND

[0004] Intelligent Electronic Devices (IED) are typically used for protection, management and supervision of utility substations and industrial power systems. lEDs are durable electronic equipment that, during their designed life, would span across a number of technological advancements and changes. These changes could affect not only the hardware electronics, but also the form factor and size of that hardware. Replacing older lEDs with similar ones is quite difficult since technologies used in the original IED would have been outdated and components would have reached their End Of Life (EOL). Replacing an older technology IED with a more recent one very often requires changing wiring and sometimes dimensions of racks and panels if a new IED form factor is introduced or a different user Input/output interface is used.

[0005] Thus, there is a need to permit the transfer and integration of current technology into older lEDs' form-factor while keeping the customer wiring locations unchanged.

[0006] SUMMARY

[0007] An object of the invention is to fulfill the need referred to above. In accordance with the principles of the present invention, this objective is obtained by a method of providing an Intelligent Electronic Device (IED) with new hardware modules. The method provides hardware modules including a pair of Analog Input Modules (AIM) modules, a Power Supply Module (PSM) , and a Binary Input/Output (BIO) module. Each module is configured for mounting in a first IED housing that has a first form factor, with the PSM and BIO module being constructed and arranged to directly connect with electrical connections of the first housing. A second IED housing is provided having a second form factor that is different from the first form factor. The AIM modules are mounted in the second housing. The AIM modules are wired to connections at a back panel of the second housing. The PSM and the BIO module are also mounted in the second housing. Adaptor structure is employed to electrically connect the PSM and the BIO module with associated connections of the second housing.

[0008] In accordance with another aspect of the disclosed embodiment, an Intelligent

Electronic Device (IED) includes a plurality of hardware modules including a pair of analog input modules (AIM) modules, a Power Supply Module (PSM) , and a Binary Input/Output (BIO) module. Each module is configured for mounting in a first IED housing that has a first form factor. The PSM and BIO module are constructed and arranged to directly connect with electrical connections of the first housing. A second IED housing is provided that has a second form factor that is different from the first form factor. The AIM modules are mounted to a bottom panel of the second housing. The PSM and the BIO module are mounted in the second housing. Wiring electrically connects the AIM modules to connections on the second housing. Adaptor structure electrically connects the PSM and the BIO module with associated connections of the second housing.

[0009] Other objects, features and characteristics of the present invention, as well as the methods of operation and the functions of the related elements of the structure, the combination of parts and economics of manufacture will become more apparent upon consideration of the following detailed description and appended claims with reference to the accompanying drawings, all of which form a part of this specification. [0010] BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The invention will be better understood from the following detailed description of the preferred embodiments thereof, taken in conjunction with the accompanying drawings, wherein like reference numerals refer to like parts, in which:

[0012] FIG. 1 A is a perspective view of an IED having a particular form factor for vertically mounted hardware modules.

[0013] FIG. 1 B is a side view of the IED of FIG. 1 A.

[0014] FIG. 2 is front view of a housing for an IED having a form factor for horizontal mounting of hardware modules.

[0015] FIG. 3 is a top view of the IED housing of FIG. 2.

[0016] FIG. 4 is a top view showing internal components of the IED of FIG. 1 .

[0017] FIG. 5A is a view of an AIM module and a communication card of the IED of FIG.

4, now mounted in the IED housing of FIG. 2.

[0018] FIG. 5B is a view of PSM and BIO modules of the IED of FIG. 4, shown ready to be mounted in the IED housing of FIG. 5A.

[0019] FIG. 6 shows grounding structure for electrically grounding an AIM module of

FIG. 5.

[0020] FIG. 7. is a rear perspective view of modules of FIG. 5B shown connected with a backpanel of an IED suitable for mounting in the housing of FIGs. 2 and 3, and also connected with a first adaptor structure, in accordance with an embodiment. [0021] FIG. 8 is a front perspective view of an IED having the modules of FIG. 7 along with a communication module disposed the housing of FIGs. 2 and 3, and connected with a second adaptor structure, in accordance with the embodiment.

[0022] FIG. 9 is a view of grounding structure for electrically grounding the adaptor structure in accordance with and embodiment.

[0023] DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

[0024] With reference to FIGs. 1 A, 1 B and 4, an IED is shown, generally indicated at 10, having a housing 1 1 with a form factor enabling mounting of hardware modules and circuit boards in a vertical arrangement therein. The modules are directly electrically connected to connections 13 at a rear of the IED 10 and to connectors (not shown) adjacent to the front panel 15. The IED 10 has a height H of 6.97", a width W of 6.97" and a depth D of 7.91 ". The IED 10 is used for protection, management and supervision of utility substations and industrial power systems.

[0025] As noted above, there are times when replacing older lEDs with newer ones is needed. FIGs. 2 and 3 shows an older type IED housing 12 that has a form factor for enabling the hardware modules to be mounted in a horizontal arrangement therein. The housing 1 2 of the embodiment has a height H of 5.22", a width W of 17.1 2" and a depth D of 9.00" (for 19" U form-factor). Below, a process and components are described that enables the hardware modules and circuit boards made for the IED of FIGs. 1 A, 1 B, and 4 to be used in the housing 12 of FIGs. 2 and 3 so that the customer can transfer and integrate current technology into an older type lEDs form factor, while advantageously keeping the customer wiring locations unchanged.

[0026] FIG. 4 shows a top view showing internal components of the IED of FIG. 1 A.

FIG. 5A shows analog input modules (AIM) 14, 14' and a communication (COM) card 1 6 of the IED of FIG. 4, now mounted in the IED housing 12 of FIG. 2. FIG. 5B shows a Power Supply Module (PSM) 18 and a Binary Input/Output (BIO) module 20 of the IED of FIG. 4, shown ready to be mounted in the IED housing 12 of FIG. 5A. [0027] With reference to FIG. 5A, in the embodiment, the AIM boards or modules 14, 14' are fixed in a horizontally adjacent manner to the bottom panel 21 inside of the housing 12 using L brackets 22 and U brackets 23. Manual wiring, shown for example at 27, electrically connects the modules 14, 14' to the connectors 24 in electrical communication with connections accessible at the back panel 25 of the housing 1 2. The primary current transformers (CTs) 26 are connected to one of the modules, e.g., module 14. The AIM modules 14, 14' can be wired with or without a Make-Before-Break (MBB) interface while maintaining full functionality and protection for the secondary CT winding. This is achieved by allowing the assembly of the boards that hold the primary CTs to be either removable in a draw-out mechanism, or be fixed within the housing 12 with constant contact with the secondary CTs and hence does not need a MBB mechanism.

[0028] One of the challenging tasks of any electrical enclosure is electrical grounding.

With reference to FIG. 6, grounding structure, for electrically grounding the AIM module 14, is shown generally indicated at 28. The grounding structure 28 includes a metal, spring-loaded clip 30 fixed to a metal bracket 23, which is used to mount the module 14 to the metal bottom panel 21 . A corner of the printed circuit board (PCB) 29 of the module 14 includes a grounding pad 34, defining the grounding contact area for the module 14. As the module 14 is assembled onto the housing 12, the grounding pad 34 is moved into engagement with the clip 30. The spring function the clip 30 keeps it engaged with the grounding pad 34 to thereby electrically ground the module 14. Similar grounding structure 28 can be used to ground the module 14'.

[0029] The innovative horizontal mounting of the AIMs 14, 14' and manual wiring provides the following:

1 ) removal of Make Before Break (MBB) mechanism as used in vertical mounting, since the AIMs in the horizontal mounting configuration are not part of a draw-out assembly,

2) addition of another primary winding with longer leads allows easy connection to the terminal block, while original primary winding with its leads allow the use of existing module tester, 3) multiple CT primary wiring that allows both conventional vertical mounting and testing with and without MBB, as well as horizontal mounting,

4) new grounding structure 28, in the two ground corners for PCB board of each module, as shown in FIG. 6 for horizontal mounting,

5) the L brackets 22 and U brackets 23 hold the modules and PCBs thereof and help to align them to the connectors at the backplane 36 (see FIG.7).

[0030] With reference to FIG. 7, the PSM 1 8 the BIO circuit board or module 20 are shown mounted in a horizontally adjacent manner to a tray 38 that is coupled to a front panel 40. The new front panel 40, for operator input, is coupled to an open end 42 of the housing 12 (FIG. 8). The entire assembly of FIG. 7 is removable or can be drawn-out from the housing 12 for maintenance and/or for accessing the AIM modules 14, 14' that are spaced below the tray 38 in the IED 10' of FIG. 8.

[0031] A protective cover 44 is provided over the module 18 and a second protective cover 46 is provided over the module 20. The covers 44, 46 provide EMC immunity to the PSM and BIO module. The covers 44, 46 also allow the use of guide rails 45 inside the covers, which help in the alignment of the modules 18, 20 with respect to the connectors on the backplane 36. Grounding is provided through stand-offs connecting the metal tray 38 to plated ground holes on the PSM and BIO circuit boards. The covers are secured to the tray 38 by metal screws. The tray 38 is engaged with electrically conductive guide rails 47 that are connected to the housing 12.

[0032] As noted above, the modules 18 and 20 are of the type configured for vertical mounting in housing 1 1 (FIG. 1 A) and include current or updated technology. To be used in the older type, second housing 1 2 and mounted horizontally adjacent therein, first adaptor structure, generally indicated at 48 (FIG. 7), is provided. In the embodiment, the first adaptor structure 48 is preferably a rigid printed circuit board 50 having connectors 52 thereon that receive mating connectors 54 of the modules 18 and 20, which would otherwise been connect directly to connectors 13 associated with the back panel 56 of the IED 10 of FIG. 1 B. With reference to FIG. 8, the circuit board 50 is also connected to associated connectors 58 that are in electrical communication with certain of the connections on the back panel 25 of the housing 12. Thus, the circuit board 50 bridges the physical gap between the modules 18 and 20 and the back panel 25. Connection between PSM and BIO module to the external Input/outputs is achieved through the circuit board 50. It is noted that the covers 44 and 46 are not shown in FIG. 8 for clarity of illustration.

[0033] With reference to FIG. 8, a second adaptor structure 48' is employed to connect the communication (COM) circuit board or card 1 6 to the backplane 36 rather than connecting the COM card 16 directly to the backplane as in the IED 1 0 of FIG. 1 A. In the embodiment, the second adaptor structure 48' is preferably a rigid printed circuit board 60 having a connector 62 that receives a mating portion of the COM card 16. A portion 64 of the circuit board 60 is electrically received by an associated connector 66 of the backplane 36, which is adjacent to the front panel 40 of the housing 12. Thus, the circuit board 60 bridges the physical gap between the COM card 16 and the backplane 36. This arrangement facilitates the access of the COM ports 68 (FIG. 3) from the back panel 25 by providing the ports 68 in the same plane like other rear terminals. The COM card 16 is fixed to the housing 1 2 by using a mounting holder 51 hanging from the top panel (not shown) of the housing 12.

[0034] Thus, the utilization of the adapter structures 48, 48' to electrically connect the hardware modules 18, 20 (configured for a first form factor) within the housing 12 (configured for a second form fact that is different from the first form factor), allows power utilities to adopt state of the art technology for their lEDs, without the need to change the physical wiring locations and input/output interface associated with the housing 12.

[0035] The adaptor structures used in the embodiment are used to extend user interface inputs and outputs from one form factor to another. Appropriate grounding of the adaptor structures can be achieved with the use of springs, brackets, or the like. For example, FIG. 9 shows grounding structure including a metal spring 68 fixed to a metal bracket 70 that is fixed to a metal side 72 of the housing 12. A corner of the printed circuit board 50 includes a grounding pad 74, defining the grounding contact area for the module 14. As the circuit board 50 is assembled onto the housing 12, the grounding pad 74 is moved into engagement with the spring 68. The spring force of the spring 68 keeps it engaged with the grounding pad 74 to thereby electrically ground the adaptor structure 48. Similar grounding structure can be used to ground the adaptor structure 48'.

[0036] Instead of using circuit boards as the first and second adaptor structures, ribbons, flexible cables, or flexible circuit boards can be employed having the appropriate electrical connections.

[0037] Advantages and benefits of the embodiments include:

1 ) IED users will be able to integrate state of the art technological advancement in the IED industry in existing environments (e.g., racks of the form factor of housing 12) without having to re-wire and change input/output interfacing to their existing lEDs.

2) Since these newer lEDs are compatible in form-factor and are wire-alike, they will allow a drop-in replacement which will shorten the IED replacement time, and hence the outage time for such replacement.

3) Since these newer lEDs provide customers with state-of-the-art technology with a reduced replacement overhead, they will give the manufacturer an edge for faster and more efficient retrofit application of their products into the market.

4) The adaptor structure 48, 48' application will allow the use of hardware modules configured for an IED (X) having one form factor, to be used for another IED (Y) with a different form factor. The adaptor structures will allow IED (X) to be wired-alike and form-factor-alike as the IED (Y).

5) The flexibility to adopt any hardware of one form-factor to a different IED form factor and wire-alike mentioned in (4) could be extended to allow adaptability between any two lEDs regardless of their manufacturer.

6) Using platform PCBs designed for different form-factors without any PCB modifications makes it possible to use same module and product testing harnesses and tools for new the products.

7) Employing new grounding structures for the modules and PCBs for a different form factor, yet commonly grounding through the housing 12. 8) The use of covers and/or brackets for using hardware modules and PCBs configured for one for factor in another form factor.

9) The provision for high precision alignment using a guide-rails and alignment pins in select locations. For example, alignment can be achieved to enable aligning two 55 pin connectors and one 1 10 pin connector with pin diameter of 0.6 mm, and tolerance of 5 mils. The connectors in this example are on three different planes.

The foregoing preferred embodiments have been shown and described for the purposes of illustrating the structural and functional principles of the present invention, as well as illustrating the methods of employing the preferred embodiments and are subject to change without departing from such principles. Therefore, this invention includes all modifications encompassed within the spirit of the following claims.