WO1991004565A1 - Transformer and connector assembly - Google Patents

Transformer and connector assembly Download PDF

Info

Publication number
WO1991004565A1
WO1991004565A1 PCT/GB1990/001409 GB9001409W WO9104565A1 WO 1991004565 A1 WO1991004565 A1 WO 1991004565A1 GB 9001409 W GB9001409 W GB 9001409W WO 9104565 A1 WO9104565 A1 WO 9104565A1
Authority
WO
WIPO (PCT)
Prior art keywords
transformer
connector
housing
box
connector assembly
Prior art date
Application number
PCT/GB1990/001409
Other languages
French (fr)
Inventor
Robert Ernest Myson
Original Assignee
Luminaire Developments Limited
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Luminaire Developments Limited filed Critical Luminaire Developments Limited
Publication of WO1991004565A1 publication Critical patent/WO1991004565A1/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/02—Casings
    • H01F27/022—Encapsulation

Definitions

  • This invention relates to a transformer and connector assembly, particularly but not exclusively for use in an outside
  • Transformers are often used for low voltage (compared to standard mains supply) lighting systems, particularly for display and decorative purposes.
  • the transformers and associated connector assemblies which are generally available lack integration and compactness, especially when used in adverse environmental conditions, where they need to be placed in enclosures which normally have to be ventilated or be of relatively high
  • transformer and connector assembly comprising a transformer having connecting wires for the primary and secondary of the transformer, with a water-tight connector box mounted on the transformer, such that the wires extend, through apertures into the connector box and in which the transformer is encapsulated within its housing with a rigid resin which seals the apertures between the transformer and connector box to provide an integral assembly.
  • the primary and secondary wire connectors are identical to the primary and secondary wire connectors.
  • cable glands made from a laminated rubber compression bush, provide a compressable seal between external cables and the connector box.
  • the bush is adjustable for different sized cables by removal of one or more of the laminated bushes.
  • a bracket is provided on the transformer for mounting the
  • an adjustable band is attached to the bracket for fixing the
  • the assembly is mounted such that the external cables enter the connector box at the lower side of the box.
  • the transformer is of a toroidal winding type, for mains to 12 or 24 volt conversion.
  • Figure 1 is a front view of an assembly
  • Figure 2 is another front view of the assembly of Figure 1 with a connector block insert
  • Figure 3 is a side view of the assembly of Figure 1; and Figure 4 is a view from beneath the assembly of Figure 1.
  • FIG. 1 there is shown a circular-shaped housing 1 containing a mains to 12 volt transformer which is attached to a connector or terminal box 2 by screws 3.
  • the transformer housing 1 is furthermore attached to the terminal box 2 by screwed nipples 4, allowing wires 0 for the primary and secondary of the transformer 1 to extend into the terminal box 2.
  • the primary terminal has multiple terminals to allow different voltage selections as required, depending on the load conditions and input voltage.
  • a screened breather hole 5 is provided in the terminal box 2 to allow air circulation to prevent condensation build up within the box 2, and pressure build up within the box 2 due to temperature changes within the box 2.
  • replaceable anti-surge fused 9 is provided within the primary connector block 7.
  • a partition 11 is also provided on the connector block 7 to separate the primary 8a and secondary 8b terminals for safety.
  • FIG. 3 a gap (exagerated in the Figures) is shown between the transformer housing 1 and terminal box 2, to provide a degree of thermal isolation between them both, due to the heat generated by the windings.
  • a neoprene seal 12 is used between the transformer housing 1 and terminal box 2, to provide a degree of thermal isolation between them both, due to the heat generated by the windings.
  • a top hat shaped bracket 13 is attached to the back of the transformer 1 on a screwed shaft 14, which extends through the transformer 1, by a self-locking nut.
  • a worm drive stainless steel band (not shown) is used to clamp the assembly on a vertical pole.
  • apertures 16 and 17 are provided for the mains cable and cable to the load respectively.
  • Variable sized resilient seals made up of a series of bushes are provided to make water-tight seals with the cables.
  • the transformer housing 1 is filled with a self extinguishing grade rigid urethane resin with high electrical and mechanical properties with good resistance to thermal and mechanical shock.
  • the resin encapsulates the winding but also fills the nipples 4 to provide a water tight and integral seal for the cables 6.
  • the invention provides a transformer and integral connector assembly which is easily manufactured and yet out performs existing assemblies, due to its water-tightness and compactness, without the need for large and expensive enclosures.
  • the assembly is ideal for use in adverse environmental conditions such as an a seashore or within a greenhouse.
  • the assembly is also ideal for dusty environments such as in industrial or agricultural buildings.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Connector Housings Or Holding Contact Members (AREA)

Abstract

A transformer and connector assembly comprises a housing (1) in which a transformer, transforming a mains supply to low voltage (e.g. 12V) for lighting equipment, is encapsulated in a rigid resin. A water-tight connector box (2) is mounted on the housing, and the primary and secondary windings connector wires (4) pass through the encapsulating resin and into the connector box (2). The resin seals the wires (4) and provides an integral assembly.

Description

TRANSFORMER AND CONNECTOR ASSEMBLY
This invention relates to a transformer and connector assembly, particularly but not exclusively for use in an outside
environment.
Transformers are often used for low voltage (compared to standard mains supply) lighting systems, particularly for display and decorative purposes. The transformers and associated connector assemblies which are generally available lack integration and compactness, especially when used in adverse environmental conditions, where they need to be placed in enclosures which normally have to be ventilated or be of relatively high
volumetric capacity to avoid overheating.
It is an object of the present invention to provide a transformer and connector assembly which ameliorates the aforementioned problems.
According to the present invention there is provided a
transformer and connector assembly comprising a transformer having connecting wires for the primary and secondary of the transformer, with a water-tight connector box mounted on the transformer, such that the wires extend, through apertures into the connector box and in which the transformer is encapsulated within its housing with a rigid resin which seals the apertures between the transformer and connector box to provide an integral assembly.
Preferably the primary and secondary wire connectors are
separated by a partition within the connector block. Preferably cable glands made from a laminated rubber compression bush, provide a compressable seal between external cables and the connector box. The bush is adjustable for different sized cables by removal of one or more of the laminated bushes.
A bracket is provided on the transformer for mounting the
assembly to a wall or any other convenient fixing. Preferably an adjustable band is attached to the bracket for fixing the
assembly to a post or other similar vertical structure.
Preferably the assembly is mounted such that the external cables enter the connector box at the lower side of the box.
Preferably the transformer is of a toroidal winding type, for mains to 12 or 24 volt conversion.
An embodiment of the present invention will now be described by way of example with reference to the accompanying drawing in which:
Figure 1 is a front view of an assembly; Figure 2 is another front view of the assembly of Figure 1 with a connector block insert;
Figure 3 is a side view of the assembly of Figure 1; and Figure 4 is a view from beneath the assembly of Figure 1.
Referring to the Figures 1 to 4 there is shown a circular-shaped housing 1 containing a mains to 12 volt transformer which is attached to a connector or terminal box 2 by screws 3. In Figure 1 the transformer housing 1 is furthermore attached to the terminal box 2 by screwed nipples 4, allowing wires 0 for the primary and secondary of the transformer 1 to extend into the terminal box 2. The primary terminal has multiple terminals to allow different voltage selections as required, depending on the load conditions and input voltage. A screened breather hole 5 is provided in the terminal box 2 to allow air circulation to prevent condensation build up within the box 2, and pressure build up within the box 2 due to temperature changes within the box 2.
In Figure 2 a connector block 7 is shown in place, with the wires G screwed in place to the relevant terminals 8. Double
protection is provided with a self resetting thermal fuse
incorporated in the windings of the transformer 1 and a
replaceable anti-surge fused 9 is provided within the primary connector block 7. A partition 11 is also provided on the connector block 7 to separate the primary 8a and secondary 8b terminals for safety.
In Figure 3 a gap (exagerated in the Figures) is shown between the transformer housing 1 and terminal box 2, to provide a degree of thermal isolation between them both, due to the heat generated by the windings. A neoprene seal 12 is used between the
transformer housing 1 and the terminal box 2. A top hat shaped bracket 13 is attached to the back of the transformer 1 on a screwed shaft 14, which extends through the transformer 1, by a self-locking nut. A worm drive stainless steel band (not shown) is used to clamp the assembly on a vertical pole.
In Figure 4 apertures 16 and 17 are provided for the mains cable and cable to the load respectively. Variable sized resilient seals, made up of a series of bushes are provided to make water-tight seals with the cables.
The transformer housing 1 is filled with a self extinguishing grade rigid urethane resin with high electrical and mechanical properties with good resistance to thermal and mechanical shock. The resin encapsulates the winding but also fills the nipples 4 to provide a water tight and integral seal for the cables 6.
The invention provides a transformer and integral connector assembly which is easily manufactured and yet out performs existing assemblies, due to its water-tightness and compactness, without the need for large and expensive enclosures. The assembly is ideal for use in adverse environmental conditions such as an a seashore or within a greenhouse. The assembly is also ideal for dusty environments such as in industrial or agricultural buildings.

Claims

1. A transformer and connector assembly, comprising a transformer having connector wires for the primary and secondary windings thereof, the transformer being encapsulated in a rigid resin within a housing, and a water-tight connector box mounted on said housing, the connector wires extending through apertures in the housing into the connector box, the resin serving to seal the apertures between the transformer housing and the connector box to provide an integral assembly.
2. A transformer and connector assembly according to Claim 1, wherein the primary and secondary connector wires are separated by a partition within the connector box.
3. A transformer and connector assembly according to Claim 1 or 2, wherein the connector box is provided with cable glands providing a compressible seal between external cables and the connector box, the glands comprising a laminated rubber compression bush.
4. A transformer and connector assembly according to any of Claims 1,2 or 3, wherein a bracket is attached to the transformer housing for mounting the assembly.
5. A transformer and connector assembly according to Claim 4, wherein the bracket carries an adjustable band for attachment around a post or the like.
6. A transformer and connector assembly according to any preceding claim, wherein the transformer is of a toroidal winding type.
PCT/GB1990/001409 1989-09-12 1990-09-12 Transformer and connector assembly WO1991004565A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8920573A GB2236216B (en) 1989-09-12 1989-09-12 Transformer and connector assembly
GB8920573.6 1989-09-12

Publications (1)

Publication Number Publication Date
WO1991004565A1 true WO1991004565A1 (en) 1991-04-04

Family

ID=10662919

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1990/001409 WO1991004565A1 (en) 1989-09-12 1990-09-12 Transformer and connector assembly

Country Status (3)

Country Link
AU (1) AU6410490A (en)
GB (1) GB2236216B (en)
WO (1) WO1991004565A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0777239A1 (en) * 1995-12-01 1997-06-04 Era-Elektrotechnik GmbH Casing arrangement for containing an encapsulated electronic component
FR2911470A1 (en) * 2007-01-12 2008-07-18 Augier S A Low voltage electric device for e.g. lighting column of single phase public lighting system, has cable network placed in independent case that is molded of insulating material to ensure electrical protection of network

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR9902887C1 (en) * 1999-07-22 2001-03-20 Siemens Ltda Distribution transformer
DE20214424U1 (en) * 2002-09-18 2003-11-20 Ludewig, Sandra, 23669 Timmendorfer Strand fairy lights

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3488616A (en) * 1967-04-18 1970-01-06 Gen Electric Dry type transformer with improved encapsulating composition
FR2173741A1 (en) * 1972-02-29 1973-10-12 Simplex App Ele
US3778529A (en) * 1972-05-11 1973-12-11 Universal Manuf Corp Moisture-resistant housing for electrical components and method and apparatus for making the same
FR2260269A7 (en) * 1974-02-05 1975-08-29 Transdurtor Ab

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3838371A (en) * 1974-02-14 1974-09-24 Honeywell Inc Mounting assembly for a transformer and relay control device
US4307365A (en) * 1978-01-27 1981-12-22 Westinghouse Electric Corp. Current transformer
US4580004A (en) * 1983-09-12 1986-04-01 Beneteau Donald J Cover assembly for electrical connections of a transformer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3488616A (en) * 1967-04-18 1970-01-06 Gen Electric Dry type transformer with improved encapsulating composition
FR2173741A1 (en) * 1972-02-29 1973-10-12 Simplex App Ele
US3778529A (en) * 1972-05-11 1973-12-11 Universal Manuf Corp Moisture-resistant housing for electrical components and method and apparatus for making the same
FR2260269A7 (en) * 1974-02-05 1975-08-29 Transdurtor Ab

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0777239A1 (en) * 1995-12-01 1997-06-04 Era-Elektrotechnik GmbH Casing arrangement for containing an encapsulated electronic component
FR2911470A1 (en) * 2007-01-12 2008-07-18 Augier S A Low voltage electric device for e.g. lighting column of single phase public lighting system, has cable network placed in independent case that is molded of insulating material to ensure electrical protection of network

Also Published As

Publication number Publication date
AU6410490A (en) 1991-04-18
GB2236216A (en) 1991-03-27
GB8920573D0 (en) 1989-10-25
GB2236216B (en) 1994-01-19

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