CA2215442A1 - Electrical device such as a network protector relay with printed circuit board seal - Google Patents
Electrical device such as a network protector relay with printed circuit board seal Download PDFInfo
- Publication number
- CA2215442A1 CA2215442A1 CA002215442A CA2215442A CA2215442A1 CA 2215442 A1 CA2215442 A1 CA 2215442A1 CA 002215442 A CA002215442 A CA 002215442A CA 2215442 A CA2215442 A CA 2215442A CA 2215442 A1 CA2215442 A1 CA 2215442A1
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- CA
- Canada
- Prior art keywords
- leads
- apertures
- circuit board
- printed circuit
- solder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/06—Hermetically-sealed casings
- H05K5/062—Hermetically-sealed casings sealed by a material injected between a non-removable cover and a body, e.g. hardening in situ
Abstract
An electrical device such as a network protector relay is protected from ambient conditions by a housing having a printed circuit board (PCB) providing a seal for the housing and air and water tight connections between relay leads and external leads. The relay leads are soldered in first plated through apertures in the PCBsubstrate while the external leads are soldered in second plated through apertures connected to corresponding first apertures by conductive traces on the substrate.
Potting material confined by a potting dam electrically insulates the solder connections on the external side of the PCB. Components can be mounted on either side of thesubstrate by soldering the component pins or leads in additinal plated through apertures electrically connected to relay and/or external leads by the conductive traces.
Components such as connectors or indicators, including, for example, light emitting diodes, can be supported in the potting dam and connected to appropriate ones of the external leads insulated by the potting material.
Potting material confined by a potting dam electrically insulates the solder connections on the external side of the PCB. Components can be mounted on either side of thesubstrate by soldering the component pins or leads in additinal plated through apertures electrically connected to relay and/or external leads by the conductive traces.
Components such as connectors or indicators, including, for example, light emitting diodes, can be supported in the potting dam and connected to appropriate ones of the external leads insulated by the potting material.
Description
CA 0221~442 1997-09-1~
ELECTRICAL DEVICE SUCH AS A NETWORK PROTECTOR RELAY WITH
PRINTED CIRCUIT BOARD SEAL
BACKGROUND OF THE INVENTION
Field of the Invention This invention relates to electrical devices which are protected from ambient conditions by sealing them in an air and water tight housing through which electrical leads for the device must extend. It has particular application to protective relays for 5 network protectors and uses a printed circuit board, through which the external electrical connections to the device are made, as a cover for the housing.
Back~round Information In many installations, it is nl~cess~ry to protect an electrical device from environmPnt~l conditions while providing the device with external connections to other 10 apparatus. One such installation is the relay for a network protector. The network protector is apparatus used to control the flow of electrical power to a distribution network such as a section of a city, a large building, or an industrial site. Such a network is fed at multiple points through transformers. The network protector includes a circuit breaker and a relay which opens the circuit to the transformer upon detection 15 of abnormal current flow.
Typically, the ~lal~r~ ller is mounted in a vault, frequently undergl~ulld. As the vault can contain water and the transformer can over heat and even catch on fire, the circuit breaker and its protective relay are mounted in a sealed tank. However, to further protect the relay, it is mounted inside a sealed housing within the tank. The protective 20 relay requires numerous electrical connections such as to current transformers which CA 0221~442 1997-09-1~
ELECTRICAL DEVICE SUCH AS A NETWORK PROTECTOR RELAY WITH
PRINTED CIRCUIT BOARD SEAL
BACKGROUND OF THE INVENTION
Field of the Invention This invention relates to electrical devices which are protected from ambient conditions by sealing them in an air and water tight housing through which electrical leads for the device must extend. It has particular application to protective relays for 5 network protectors and uses a printed circuit board, through which the external electrical connections to the device are made, as a cover for the housing.
Back~round Information In many installations, it is nl~cess~ry to protect an electrical device from environmPnt~l conditions while providing the device with external connections to other 10 apparatus. One such installation is the relay for a network protector. The network protector is apparatus used to control the flow of electrical power to a distribution network such as a section of a city, a large building, or an industrial site. Such a network is fed at multiple points through transformers. The network protector includes a circuit breaker and a relay which opens the circuit to the transformer upon detection 15 of abnormal current flow.
Typically, the ~lal~r~ ller is mounted in a vault, frequently undergl~ulld. As the vault can contain water and the transformer can over heat and even catch on fire, the circuit breaker and its protective relay are mounted in a sealed tank. However, to further protect the relay, it is mounted inside a sealed housing within the tank. The protective 20 relay requires numerous electrical connections such as to current transformers which CA 0221~442 1997-09-1~
sense the network currents and to the circuit breaker. Feed throughs in which the in.~ ted wires from the relay are clamped by a rubber gasket at the penetration through the housing have not proved satisfactory, even if the gasket is sealed tightly around the leads, as air and moisture can leak between the conductor and the insulation and along 5 the individual strands of stranded leads. Now, the practice is to use feed throughs in which glass plugs fuse short sections of wire in apertures in a metal plate. The relay wires are soldered to loops on the inner ends of the feed throughs, while corresponding external leads are soldered to loops on the outer ends. Such feed throughs are expensive.
There is a need therefore for improved arrangements for making electrical 10 connections to electrical devices enclosed in a housing, and in particular to network protector relays.
There is a need for providing such improved arrangements which are economical and practical to implement.
There is a further need for such arrangelllcllL~ which are air tight and water tight.
SUMMARY OF THE INVFNTION
These needs and others are satisfied by the invention which is directed to apparatus for protecting electrical devices from ambient conditions while providing electrical connections to the device. The apparatus in~hldes a housing having an opening and in which the electrical device is mounted. A printed circuit board comprising an 20 insulating substrate and electrical connections for conn-~cting device leads to corresponding ones of external leads. The electrical connections include plated through apertures extending through the substrate in which the device leads are inserted from inside the housing and the external leads are inserted from outside the housing. The leads are secured in the plated through apertures by solder. The apparatus further CA 0221~442 1997-09-1~
There is a need therefore for improved arrangements for making electrical 10 connections to electrical devices enclosed in a housing, and in particular to network protector relays.
There is a need for providing such improved arrangements which are economical and practical to implement.
There is a further need for such arrangelllcllL~ which are air tight and water tight.
SUMMARY OF THE INVFNTION
These needs and others are satisfied by the invention which is directed to apparatus for protecting electrical devices from ambient conditions while providing electrical connections to the device. The apparatus in~hldes a housing having an opening and in which the electrical device is mounted. A printed circuit board comprising an 20 insulating substrate and electrical connections for conn-~cting device leads to corresponding ones of external leads. The electrical connections include plated through apertures extending through the substrate in which the device leads are inserted from inside the housing and the external leads are inserted from outside the housing. The leads are secured in the plated through apertures by solder. The apparatus further CA 0221~442 1997-09-1~
includes means securing the printed circuit board over the opening in the housing to form an air tight and water tight seal.
Preferably, the apertures in the substrate include first apertures in which the device leads are secured by solder and second apertures in which the external leads are 5 secured by solder. Conductive traces on the substrate electrically connect the first and second apertures for corresponding device leads and external leads.
Preferably, the printed circuit board has an electrically insulative material applied over at least the solder connections on the external side of the printed circuit board.
Most preferably, the insulative material is a potting material which is contained within 10 potting dams surrounding the portions of the printed circuit board which are to be potted.
As another aspect of the invention? components can be mounted on either side of the printed circuit board. In addition, components such as connectors for the external wiring and indicators such as, for instance, light emitting diodes (LEDs) can besupported in the potting dam.
The invention has particular application to network protector relays. The components mounted on the printed circuit board forming the seal for the housing can include, for instance, auxiliary current transformers, and burden resistors which convert the sensed currents into voltages for input to the relay. These components can be on either side of the printed circuit board, but preferably the burden resistors are on the 20 inside and the auxiliary current transformers are on the outside.
BRTFF DESCRIPTION OF THE DRAWINGS
A full understanding of the invention can be gained from the following description of the plef~ d embodiments when read in conjunction with the accompanying drawings in which:
CA 0221~442 1997-09-1~
Preferably, the apertures in the substrate include first apertures in which the device leads are secured by solder and second apertures in which the external leads are 5 secured by solder. Conductive traces on the substrate electrically connect the first and second apertures for corresponding device leads and external leads.
Preferably, the printed circuit board has an electrically insulative material applied over at least the solder connections on the external side of the printed circuit board.
Most preferably, the insulative material is a potting material which is contained within 10 potting dams surrounding the portions of the printed circuit board which are to be potted.
As another aspect of the invention? components can be mounted on either side of the printed circuit board. In addition, components such as connectors for the external wiring and indicators such as, for instance, light emitting diodes (LEDs) can besupported in the potting dam.
The invention has particular application to network protector relays. The components mounted on the printed circuit board forming the seal for the housing can include, for instance, auxiliary current transformers, and burden resistors which convert the sensed currents into voltages for input to the relay. These components can be on either side of the printed circuit board, but preferably the burden resistors are on the 20 inside and the auxiliary current transformers are on the outside.
BRTFF DESCRIPTION OF THE DRAWINGS
A full understanding of the invention can be gained from the following description of the plef~ d embodiments when read in conjunction with the accompanying drawings in which:
CA 0221~442 1997-09-1~
Figure 1 is a schematic view of a ll~Lwolk transformer having a network protector including a network protector relay incorporating the invention.
Figure 2 is a longihl(lin~l section through a network protector relay and its housing in accordance with the invention.
Figure 3 is an isometric view of a printed circuit board which forms part of therelay enclosure shown with parts cut away.
Figures 4A-4C are fragmentary cross sectional views through portions of the print circuit board showing lead connections in accordance with three embodiments of the invention.
Figures 5A-5C are plan views of the connections of Figures 4A-4C.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The invention will be described as applied to the protection of a network protector relay to which it has particular application. It will be realized, however, that the invention has further application to the protection of other types of electrical devices from ambient conditions while providing connections between the device and external wiring which are both air tight and water tight.
Figure 1 illustrates a network protector 1 used in conjunction with a transformer 3 feeding a network 5, which for instance could service a section of a city, a large building, an industrial site or other local electrical distribution systems. The network 5 is fed by a number of other transformers (not shown) similar to the transformer 3.
Often, the tran~rollllel 3 with its network protector 1 is installed in an underground vault 7 in which water can accllm~ te. Thus, the network protector 1 is housed in a water and air tight tank 9.
CA 0221~442 1997-09-1~
Figure 2 is a longihl(lin~l section through a network protector relay and its housing in accordance with the invention.
Figure 3 is an isometric view of a printed circuit board which forms part of therelay enclosure shown with parts cut away.
Figures 4A-4C are fragmentary cross sectional views through portions of the print circuit board showing lead connections in accordance with three embodiments of the invention.
Figures 5A-5C are plan views of the connections of Figures 4A-4C.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The invention will be described as applied to the protection of a network protector relay to which it has particular application. It will be realized, however, that the invention has further application to the protection of other types of electrical devices from ambient conditions while providing connections between the device and external wiring which are both air tight and water tight.
Figure 1 illustrates a network protector 1 used in conjunction with a transformer 3 feeding a network 5, which for instance could service a section of a city, a large building, an industrial site or other local electrical distribution systems. The network 5 is fed by a number of other transformers (not shown) similar to the transformer 3.
Often, the tran~rollllel 3 with its network protector 1 is installed in an underground vault 7 in which water can accllm~ te. Thus, the network protector 1 is housed in a water and air tight tank 9.
CA 0221~442 1997-09-1~
The network protector 1 includes a circuit breaker 11 and a relay unit 13. A
major function of the relay unit 13 is to detect abnormal current flow through the transformer which could include flow of current out of the network 5 through thetransformer 3 in the event of certain fault conditions.
SThe relay unit 13 includes a protective relay 15 and an enclosure 17 for the relay as seen in Figure 2. The enclosure 17 includes a housing 19 having an opening 21 at one end, which, as will be seen, is closed by a closure in the form of a printed circuit board (PCB) 23.
The protective relay 15 in the plefe,led embodiment, is a digital relay which, for 10example, includes a power PCB 25 and a processor PCB 27 which are supported inspaced relation at one end by a mounting spacer 29 secured to the PCB 23 which serves as a mother board, and at the other end by a notched locator bracket 31 secured to the housing 19. Electrical connections between the power PCB 25 and the processor PCB
27 are made by inter-board connectors 33. A spacer 35 m~int~in~ a fixed spacing lSbetween the boards at the ends supported by the PCB locator 31.
The printed circuit board 23 serves as a cover for the opening 21 in the housing.
The board 23 is secured over the opening 21 by screws 37 extending through the PCB
23 and sealed with O rings 39. The screws 3? thread into mounting bosses 41 brazed to the inside of the housing 19. A gasket 43 is clamped between the printed circuit board 2023 and the housing 19 to provide a water and air tight seal.
The printed circuit board 23 also provides connections 45 between relay leads 47and external leads 49.
As seen more clearly in Figures 3 and 4A-C and 5A-C, the electrical connections 45 include plated through apertures 51 in the printed circuit board 23. In the preferred CA 0221~442 1997-09-1~
major function of the relay unit 13 is to detect abnormal current flow through the transformer which could include flow of current out of the network 5 through thetransformer 3 in the event of certain fault conditions.
SThe relay unit 13 includes a protective relay 15 and an enclosure 17 for the relay as seen in Figure 2. The enclosure 17 includes a housing 19 having an opening 21 at one end, which, as will be seen, is closed by a closure in the form of a printed circuit board (PCB) 23.
The protective relay 15 in the plefe,led embodiment, is a digital relay which, for 10example, includes a power PCB 25 and a processor PCB 27 which are supported inspaced relation at one end by a mounting spacer 29 secured to the PCB 23 which serves as a mother board, and at the other end by a notched locator bracket 31 secured to the housing 19. Electrical connections between the power PCB 25 and the processor PCB
27 are made by inter-board connectors 33. A spacer 35 m~int~in~ a fixed spacing lSbetween the boards at the ends supported by the PCB locator 31.
The printed circuit board 23 serves as a cover for the opening 21 in the housing.
The board 23 is secured over the opening 21 by screws 37 extending through the PCB
23 and sealed with O rings 39. The screws 3? thread into mounting bosses 41 brazed to the inside of the housing 19. A gasket 43 is clamped between the printed circuit board 2023 and the housing 19 to provide a water and air tight seal.
The printed circuit board 23 also provides connections 45 between relay leads 47and external leads 49.
As seen more clearly in Figures 3 and 4A-C and 5A-C, the electrical connections 45 include plated through apertures 51 in the printed circuit board 23. In the preferred CA 0221~442 1997-09-1~
form of the invention, stripped ends 47w of the relay leads 47 are inserted into first apertures 51a from the inner side 23a of the printed circuit board and secured in place by solder 53. Similarly, the stripped end 49w of the corresponding external lead 49 is inserted from the outer side 23b of the printed circuit board into a corresponding second 5 plated through aperture 57b spaced laterally from the aperture 51a and is also filled with solder 53. The solder 53 is introduced into the apertures 51a from the outer side 23b of the printed circuit board 23, while additional solder 53 is introduced into the apertures 51b from the inner side 23a of the printed circuit board where there is no interference from the lead being conn~cted In this manner, a sound solder connection which is air 10 tight and water tight can be easily made. The corresponding solder filled apertures 51a and 51b are electrically connected by an associated electrically conductive trace 55 on the PCB 23. Such connected traces can be made on either or both sides of the printed circuit board 23.
Even where the conductive traces 55 are on the inner side 23a of the printed 15 circuit board 23, there are exposed electrical connections on the outer side 23b. In order to electrically insulate such connections, a potting material 57 can be applied to the outer side 23b of the printed circuit board 23. Preferably, as seen in Figures 2 and 3, a potting dam 59 surrounds the section of the printed circuit board 23 that is to be potted. For example, an aluminnm angle piece can have one flange 59f cut at the corners and bent 20 to form an enclosure. The cut flanges are secured to the printed circuit board, such as, for example, by the mounting screws 37.
The potting dam 59 not only confines the potting material 57, but can also serveas mounts for various types of components. For instance, connectors such as the comm--ni~tions connector 61 can be mechanically mounted in an opening 63 in the CA 0221~442 1997-09-1~
Even where the conductive traces 55 are on the inner side 23a of the printed 15 circuit board 23, there are exposed electrical connections on the outer side 23b. In order to electrically insulate such connections, a potting material 57 can be applied to the outer side 23b of the printed circuit board 23. Preferably, as seen in Figures 2 and 3, a potting dam 59 surrounds the section of the printed circuit board 23 that is to be potted. For example, an aluminnm angle piece can have one flange 59f cut at the corners and bent 20 to form an enclosure. The cut flanges are secured to the printed circuit board, such as, for example, by the mounting screws 37.
The potting dam 59 not only confines the potting material 57, but can also serveas mounts for various types of components. For instance, connectors such as the comm--ni~tions connector 61 can be mechanically mounted in an opening 63 in the CA 0221~442 1997-09-1~
upright flange 65 of the potting dam 59. External leads 49c connected to these connectors 61 are then bent at a right angle to penekate the PCB 23 through a connection 45 as described above.
Another example of a component which can be supported by the potting dam 59 5 is the light emitting diode (LED) 67 which is mounted in an opening 69 in the upright flange 65 of the potting dam 59. Again, the external leads 471 for the LED are bent at right angles and are connected to the printed circuit board 23 by a connection 45.
Still another example of a component mounted on the printed circuit board 23 forming the closure for the housing 19 is an auxiliary current transformer (CT) 71. As shown in Figure 3, such auxiliary CTs 71 come mounted on a platform 73 having four pins 49p(1), 49p(2), and 49s(1) and 49s(2), which form electrical connections for the primary and secondary windings of the CT as well as mechanically supporting the CT
71 on the printed circuit board 23. The pins 49p(1) and 49p(2) for the primary winding of the CT formed by the wire 49p are inserted into third plated through apertures 51p from the outer side 23b of the printed circuit board 23 as shown in Figures 4C and 5C.
As the CT pl.l.laly windings 49p are connPct~ to main CTs (not shown) external to the enclosure 17, the corresponding leads 49q connected to the main CTs also penetrate fourth apertures 53q from the outer side 23b of the PCB 23. The corresponding apertures 51p and 51q are connected on the inner side 23a of the PCB 23 by the 20 associated conductive traces 55p to complete the connections 45'. Other components, typically mounted on platforms, can be mounted to the printed circuit board 23 in a similar manner either on the inner side 23a or the outer side 23b.
Another example of a component which can be mounted on the PCB 23 is a burden resistor 75 for converting the ~;ullellL~ sensed by the CTs into voltages for input CA 0221~442 1997-09-1~
Another example of a component which can be supported by the potting dam 59 5 is the light emitting diode (LED) 67 which is mounted in an opening 69 in the upright flange 65 of the potting dam 59. Again, the external leads 471 for the LED are bent at right angles and are connected to the printed circuit board 23 by a connection 45.
Still another example of a component mounted on the printed circuit board 23 forming the closure for the housing 19 is an auxiliary current transformer (CT) 71. As shown in Figure 3, such auxiliary CTs 71 come mounted on a platform 73 having four pins 49p(1), 49p(2), and 49s(1) and 49s(2), which form electrical connections for the primary and secondary windings of the CT as well as mechanically supporting the CT
71 on the printed circuit board 23. The pins 49p(1) and 49p(2) for the primary winding of the CT formed by the wire 49p are inserted into third plated through apertures 51p from the outer side 23b of the printed circuit board 23 as shown in Figures 4C and 5C.
As the CT pl.l.laly windings 49p are connPct~ to main CTs (not shown) external to the enclosure 17, the corresponding leads 49q connected to the main CTs also penetrate fourth apertures 53q from the outer side 23b of the PCB 23. The corresponding apertures 51p and 51q are connected on the inner side 23a of the PCB 23 by the 20 associated conductive traces 55p to complete the connections 45'. Other components, typically mounted on platforms, can be mounted to the printed circuit board 23 in a similar manner either on the inner side 23a or the outer side 23b.
Another example of a component which can be mounted on the PCB 23 is a burden resistor 75 for converting the ~;ullellL~ sensed by the CTs into voltages for input CA 0221~442 1997-09-1~
to the relay. In this case, each connection 45" for the ends of the burden resistor 75 include, as shown in Figures 4B and SB, three apertures: a first aperture 51a in which the lead to the relay is soldered, a second aperture Slb to which a pin 49s(1) for the secondary coil of the CT 71 is soldered and an additional aperture Slr in which one lead S 77 from the burden resistor 75 is soldered by solder 53. These three apertures are then connPcte~l by an associated cornmon conductive trace 55s. A similar connection is made to the other end of the burden resistor, CT secondary winding and relay lead so that the burden resistor 75 is connected across the secondary winding of the auxiliary CT 71.
While specific embodiments of the invention have been described in detail, it will 10 be appreciated by those skilled in the art that various modifications and alternatives to those details could be developed in light of the overall teachings of the disclosure.
Accordingly, the particular arrangements disclosed are meant to be illustrative only and not limitin~ as to the scope of invention which is to be given the full breadth of the claims appended and any and all equivalents thereof.
While specific embodiments of the invention have been described in detail, it will 10 be appreciated by those skilled in the art that various modifications and alternatives to those details could be developed in light of the overall teachings of the disclosure.
Accordingly, the particular arrangements disclosed are meant to be illustrative only and not limitin~ as to the scope of invention which is to be given the full breadth of the claims appended and any and all equivalents thereof.
Claims (17)
1. A network protector unit comprising:
a housing having an opening;
a relay mounted inside said housing and having relay leads extending therefrom;
external leads outside said housing;
a printed circuit board having air tight and water tight electrical connections connecting said relay leads to said external leads; and means securing said printed circuit board across said opening to form an air tight and water tight seal for said housing.
a housing having an opening;
a relay mounted inside said housing and having relay leads extending therefrom;
external leads outside said housing;
a printed circuit board having air tight and water tight electrical connections connecting said relay leads to said external leads; and means securing said printed circuit board across said opening to form an air tight and water tight seal for said housing.
2. The network protector relay unit of Claim 1 wherein said means securing said printed circuit board across said opening includes a sealing gasket and fastening means clamping said sealing gasket between said printed circuit board and said housing around said opening.
3. The network protector relay unit of Claim 1 wherein said printed circuit board comprises an insulative substrate, and said air tight and water tight electrical connections comprise conductive traces on said substrate for corresponding ones of said relay leads and said external leads, first solder connections between each of said relay leads and an associated conductive trace, and second solder connections between each of said external leads and a conductive trace associated with a corresponding relay lead.
4. The network protector relay unit of Claim 3 wherein said first solder connections comprise first apertures extending through said substrate in which said relay leads are inserted and which are filled with solder, and said second solder connections comprise second apertures extending through said substrate in which said external leads are inserted and which are filled with solder, said associated conductive traces extending between said first and second apertures and in electrical contact with said solder.
5. The network protector relay unit of Claim 4 wherein said first and second apertures are plated through apertures.
6. The network protector relay unit of Claim 1 wherein said printed circuit board comprises an insulative substrate, and said air tight and water tight electrical connections comprise plated through apertures extending through said substrate and in which said relay leads are inserted from inside said housing and said external leads are inserted from said outside said housing and in which said relay leads and external leads are secured by solder.
7. The network protector relay unit of Claim 6 wherein said apertures include the first apertures in which said relay leads are inserted from inside said housing and secured with solder and second plated through apertures in which said external leads are inserted from outside said housing and secured with solder, and wherein said air tight and water tight connections further include associated conductive traces on said substrate electrically connecting corresponding ones of said first and second plated through apertures.
8. The network protector relay unit of Claim 7 wherein said printed circuit board has components mounted thereon by leads inserted in additional plated through apertures and secured therein by solder, said additional plated through apertures being electrically connected by a conductive trace with selected ones of said first and second apertures.
9. The network protector relay unit of Claim 7 wherein said printed circuit board has potting material applied over at least some connections on an outer side of said substrate external to said housing.
10. The network protector relay unit of Claim 9 wherein said printed circuit board has a potting dam confining said potting material applied to said external side of said substrate.
11. The network protector relay unit of Claim 10 including components supported in said potting dam, connected to said external leads and wherein said potting material electrically insulates said external leads connected to said components.
12. The network protector relay unit of Claim 7 wherein said printed circuit board has components mounted on a first side thereof and wherein said air tight and water tight connections include third plated through apertures extending through said substrate in which component leads are inserted from said first side of said printed circuit board and secured with solders fourth plated through apertures extendingthrough said substrate in which leads are inserted also from said first side of said printed circuit board and secured with solder, and additional associated conductive traces on said substrate electrically connecting corresponding ones of said third and fourth plated through apertures.
13. Apparatus for protecting from ambient conditions an electrical device having device leads for connection to external leads said apparatus comprising:
a housing having an opening and in which said electrical device is mounted;
a printed circuit board having a substrate and electrical connections for connecting said device leads to corresponding ones of said external leads, said electrical connections including apertures extending through said substrate in which said device leads are inserted from inside said housing and said external leads are inserted from outside said housing and in which said device leads and external leads are secured by solder; and means securing said printed circuit board over said opening to form an air tight and water tight seal for said housing.
a housing having an opening and in which said electrical device is mounted;
a printed circuit board having a substrate and electrical connections for connecting said device leads to corresponding ones of said external leads, said electrical connections including apertures extending through said substrate in which said device leads are inserted from inside said housing and said external leads are inserted from outside said housing and in which said device leads and external leads are secured by solder; and means securing said printed circuit board over said opening to form an air tight and water tight seal for said housing.
14. The apparatus of Claim 13 wherein said apertures in said substrate comprise first plated through apertures in which the device leads are secured by said solder and second plated through apertures in which said external leads are secured by said solder, and conductive traces on said substrate electrically connecting said first apertures with said second apertures for corresponding device leads and external leads.
15. The apparatus of claim 13 wherein said printed circuit board further has electrically insulative material applied over said solder on an external side of said printed circuit board.
16. The apparatus of Claim 14 including dam means confining said electrically insulative material on said external side of said printed circuit board.
17. The apparatus of claim 15 including components supported by said dam means and connected to said external leads which are electrically insulated by said electrically insulative material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US715,317 | 1996-09-16 | ||
| US08/715,317 US5844781A (en) | 1996-09-16 | 1996-09-16 | Electrical device such as a network protector relay with printed circuit board seal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2215442A1 true CA2215442A1 (en) | 1998-03-16 |
Family
ID=24873548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002215442A Abandoned CA2215442A1 (en) | 1996-09-16 | 1997-09-15 | Electrical device such as a network protector relay with printed circuit board seal |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US5844781A (en) |
| JP (1) | JPH10154885A (en) |
| KR (1) | KR19980024670A (en) |
| CN (1) | CN1177194A (en) |
| AR (1) | AR009361A1 (en) |
| BR (1) | BR9702856A (en) |
| CA (1) | CA2215442A1 (en) |
| ID (1) | ID20852A (en) |
| SG (1) | SG67413A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW337401U (en) * | 1997-10-09 | 1998-07-21 | Weltek Electronics Co Ltd | Waterproof case |
| US6504693B1 (en) | 2000-02-25 | 2003-01-07 | Eaton Corporation | Network protector relay providing a close function |
| US6404645B1 (en) * | 2000-02-29 | 2002-06-11 | Avaya Technology Corp. | System for supporting electronic components |
| US6671151B2 (en) | 2001-10-03 | 2003-12-30 | Eaton Corporation | Network protector relay and method of controlling a circuit breaker employing two trip characteristics |
| US6697258B1 (en) | 2002-10-24 | 2004-02-24 | The Raymond Corporation | Moisture-resistant enclosure for electronic circuitry |
| CA2528889C (en) | 2003-06-26 | 2010-05-11 | Formation, Inc. | Environmental protection of serial ata and other electronic devices |
| DE102004007230B4 (en) * | 2004-02-13 | 2006-03-30 | Siemens Ag | Housing with liquid-tight electrical feedthrough |
| US6946942B1 (en) * | 2004-03-31 | 2005-09-20 | Amphenol Taiwan Corporation | Transformer |
| CN1294328C (en) * | 2004-06-11 | 2007-01-10 | 辽宁省水利水电科学研究院 | Instrument box protecting dam barometer tube |
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| JP2827900B2 (en) * | 1994-05-30 | 1998-11-25 | 株式会社イナックス | Toilet control box |
-
1996
- 1996-09-16 US US08/715,317 patent/US5844781A/en not_active Expired - Lifetime
-
1997
- 1997-08-20 SG SG1997003006A patent/SG67413A1/en unknown
- 1997-09-10 BR BR9702856A patent/BR9702856A/en active Search and Examination
- 1997-09-10 ID IDP973140A patent/ID20852A/en unknown
- 1997-09-12 JP JP9288993A patent/JPH10154885A/en not_active Withdrawn
- 1997-09-13 KR KR1019970047395A patent/KR19980024670A/en active IP Right Grant
- 1997-09-15 CA CA002215442A patent/CA2215442A1/en not_active Abandoned
- 1997-09-15 AR ARP970104214A patent/AR009361A1/en unknown
- 1997-09-15 CN CN97118456.9A patent/CN1177194A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| KR19980024670A (en) | 1998-07-06 |
| SG67413A1 (en) | 1999-09-21 |
| AR009361A1 (en) | 2000-04-12 |
| ID20852A (en) | 1999-03-18 |
| JPH10154885A (en) | 1998-06-09 |
| CN1177194A (en) | 1998-03-25 |
| US5844781A (en) | 1998-12-01 |
| MX9707043A (en) | 1998-03-31 |
| BR9702856A (en) | 1999-01-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |