GB2292224A - Mains warning flashing unit - Google Patents

Mains warning flashing unit Download PDF

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Publication number
GB2292224A
GB2292224A GB9416133A GB9416133A GB2292224A GB 2292224 A GB2292224 A GB 2292224A GB 9416133 A GB9416133 A GB 9416133A GB 9416133 A GB9416133 A GB 9416133A GB 2292224 A GB2292224 A GB 2292224A
Authority
GB
United Kingdom
Prior art keywords
warning
tube
mains
phase
gas
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.)
Withdrawn
Application number
GB9416133A
Other versions
GB9416133D0 (en
Inventor
Glynne Malcolm Taylor
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB9416133A priority Critical patent/GB2292224A/en
Publication of GB9416133D0 publication Critical patent/GB9416133D0/en
Publication of GB2292224A publication Critical patent/GB2292224A/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/145—Indicating the presence of current or voltage
    • G01R19/155—Indicating the presence of voltage

Abstract

To indicate that (either 2 phase or 3 phase) voltage is present in a electrical apparatus, xenon tubes (X1, X2) are fired through asynchrous circuitry comprising Zener diodes (D1, D2) (D9, D10), thyristors (Q1, Q2) and step-up transformers (T1, T2). If mains voltage is present at input terminals B1, the high brightness tubes X1, X2 flash alternately at a highly visible rate of 1 per second. <IMAGE>

Description

3PH - MAINS WARNING FLASHING UNIT The invention relates to a Mains Warning Device for medium voltage.
The warning device flashes when 3 phases or 2 phases are present: It also duplicates as a phase failure device.
The advantage of this unit is that it has a much brighter illumination as it uses Xenon tubes and works from 2 or 3 phases supply. Because of the intense flash people are aware that voltage is still present in the apparatus and it alerts them to the danger and is a constant reminder.
The supply to the device can be fed through a suitable door 3 Phase Limit Switch. If the mains isolator is switched back on, to assist in fault finding the unit flashes at a determinated rate thereby warning personnel that voltage is present. If one phase of a three phase supply is missing the flash rate changes, thereby indicating a phase failure.
Two independent Xenon tube flashing circuits are fed from rectified three phase mains and is repeated every second.
The circuits are asynchronous, and each flash is of 0.2 Joules energy and is repeated every second.
The units will operate over a wide range and will work if two phases are present at a reduced flash rate.
FIG. 1 The 3 phase of 2 phase supply is rectified by D3-D8, R4-R6 being in circuit to reduce voltage surges. When Capacitor C2(C3) is charged to a sufficient level via R3(R7) current flows through Dl,Rl,D2,R2, (DlO,R9,D9,R8). This allows C1(C4) to charge via T1(T2). Q1(Q2) fires when potential on gate reaches approximately 1 volt discharging C1(C4) through T1(T2) Q1(Q2). T1(T2) is a step-up transformer thereby producing high voltage pulse to fire Xenon tube X1(X2).
The P.C.B. Fig.2 is housed in a transparent box with Xenon tubes at either end.
Extra safety features in the design is that lid cannot be removed while fixing screws or supply wires connected.
COMPONENT LIST COMPONENT TYPE Dl,D2,D9,D10 1N5383B D3-D8 IN4007 Q1,Q2 X0203NA X1,X2 T1,T2 C1,C4 33N 250v C2,C3 4U7 450v Rl ,R9 100K 0.25W R2,R8 10K 0.25W R3,R7 220K 2W R4,R5,R6 22K 0.5W B1 p (qty 6) single sided PCB pins CASE

Claims (8)

  1. CLAIMS 1) A warning device to indicate that an item of electrical equipment is live by means of at least one signalling (warning) element, characterised in that each signalling element comprises a gasfilled tube and electrical circuitry for the firing of the gas-filled tube.
  2. 2) A device according to claim 1 wherein the gas-filled tube is ignited by means of a step-up transformer.
  3. 3) A device according to claim 1 or claim 2 wherein the gas-filled tube is operated by circuitry comprising a Zener diode and a thyristor.
  4. 4) A device according to any of claims 1 to 3 wherein the gas-filled tube is a Xenon tube.
  5. 5) A device according to any of claims 1 to 4 wherein the unit is adapted to work on 2 or 3 phase supply with flash rate of one every second.
  6. 6) A device according to any of claims 1 to 5 wherein the electrical circuitry comprises a capacitor to provide energy for the flashing of the tube.
  7. 7) A device according to any of claims 1 to 6 wherein the frequency of flashing is determined by a RC network warning.
  8. 8) A warning device as herein described and as shown in the drawings.
GB9416133A 1994-08-10 1994-08-10 Mains warning flashing unit Withdrawn GB2292224A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9416133A GB2292224A (en) 1994-08-10 1994-08-10 Mains warning flashing unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9416133A GB2292224A (en) 1994-08-10 1994-08-10 Mains warning flashing unit

Publications (2)

Publication Number Publication Date
GB9416133D0 GB9416133D0 (en) 1994-09-28
GB2292224A true GB2292224A (en) 1996-02-14

Family

ID=10759664

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9416133A Withdrawn GB2292224A (en) 1994-08-10 1994-08-10 Mains warning flashing unit

Country Status (1)

Country Link
GB (1) GB2292224A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2312518A (en) * 1996-04-26 1997-10-29 Glynne Malcolm Taylor Mains warning flashing unit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4152643A (en) * 1978-04-10 1979-05-01 E. O. Schweitzer Manufacturing Co., Inc. Voltage indicating test point cap
GB2066484A (en) * 1978-11-15 1981-07-08 Ipa Anstalt Single Pole Voltage Detector
EP0109914A1 (en) * 1982-11-18 1984-05-30 Edouard Singer Device for detecting the presence of voltage in electrical installations
WO1991018375A1 (en) * 1990-05-23 1991-11-28 Service Machine Company Voltage pick-up circuit and flashing display for high voltage indicator device and input electrode therefor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4152643A (en) * 1978-04-10 1979-05-01 E. O. Schweitzer Manufacturing Co., Inc. Voltage indicating test point cap
GB2066484A (en) * 1978-11-15 1981-07-08 Ipa Anstalt Single Pole Voltage Detector
EP0109914A1 (en) * 1982-11-18 1984-05-30 Edouard Singer Device for detecting the presence of voltage in electrical installations
WO1991018375A1 (en) * 1990-05-23 1991-11-28 Service Machine Company Voltage pick-up circuit and flashing display for high voltage indicator device and input electrode therefor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2312518A (en) * 1996-04-26 1997-10-29 Glynne Malcolm Taylor Mains warning flashing unit
GB2312518B (en) * 1996-04-26 1998-03-25 Glynne Malcolm Taylor Warning device for live electricity

Also Published As

Publication number Publication date
GB9416133D0 (en) 1994-09-28

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)