GB2229872A - An intrinsically safe electric energy transmission system - Google Patents
An intrinsically safe electric energy transmission system Download PDFInfo
- Publication number
- GB2229872A GB2229872A GB9004004A GB9004004A GB2229872A GB 2229872 A GB2229872 A GB 2229872A GB 9004004 A GB9004004 A GB 9004004A GB 9004004 A GB9004004 A GB 9004004A GB 2229872 A GB2229872 A GB 2229872A
- Authority
- GB
- United Kingdom
- Prior art keywords
- energy transmission
- line
- intrinsically safe
- diode
- transmission system
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/008—Intrinsically safe circuits
Landscapes
- Emergency Protection Circuit Devices (AREA)
Description
An electric energy transmission system for intrinsically safe transmission
of energy The invention relates to an electric energy transmission system for intrinsically safe energy transmissicn, in particular for face support controls in mining, and comprising an intrinsically safe power supply and an energy transmission line connected to its dc voltage output and to at 'least one load.
The tra,nsmission of energy in a consumer network is required to be intrinsically safe, particularly in mining, as per German VDE Standard 0117. This means thall, n the event of a load, the voltage on the consumer side must not be higher than e.g. 12 volts dc and the current must not be higher than e.g. 2 amps dc. Accordingly, there are limitations to the maximum possible transmission length, due to the impedance of the transmission line in the consumer power system and depending on the permitted maximum voltages and currents.
The obJect, of the invention is to provide a means of ensuring intrinsic safety and also enabling the 2 energy transmission line to be given any desired length.
To this end according to the invention the energy transmission line comprises at least one intrinsically safe line portion terminated by a Zener diode having a Zener voltage matching the maximum transmission voltage and connected in parallel with a diode for neutralising inverse voltages, and the length of the intrinsically safe line portion is less than or equal to the length of' line determined by the line impedance and tChe intrnsic safety values for the voltage and current. The -Invent-lon is based on the discovery that the termination according to the invention, comprising the Zener diode and connected in parallel, provides an intrinsically safe portion of line, which always ensures that the maximum permissible intrinsic safety values for the voltage and current are not exceeded. This is because the Zener diode limits the maximum possible output voltage in the event of a break in the 1-ine, and the diode limits the maximum possible current by preventing inverse voltages being caused by shortcircuits.
Line portions of this kind can be connected in series, and consequently the possible length of the energy transmission Iine is practically unlimited, while ensuring the intrinsic safety of the entire system.
Advantageous embodiments of the invention are included in the sub-claims.
The invention will be explained in detail with reference to the accompanying drawings, in which:
Fig. 1 is a block circuit diagram of an energy transmission system according to the invention, and Fig. 2 is a block circu41t diagram of a system according to the invention and comprising a number of loads.
As F-19. 1 shows, an energy transmission system according to the inventior comprises an intrinsically safe power supply 1 having an input ac of e.g. 220 V and generating an output c voltage of e.g. 12 V and an output dc of e.g. 2 A.
An energy transmissicn line 2 is connected to the output of the power supply., and is represented in the equivalent circuit diagram. by a "long line". The equivalent circuit diagrarr, of a "long line" is formed by ohmic resistors 3, inductors 4 and a capacitor 5. A Zener diode 6 and a diode 7 are connected in parallel to the output of line 2. The cathodes of both diodes 6 and 7 are connected to the positive terminal. A load 8 is connected to line 2 befcre the Zener diode 6 and diode 7 connected in paral'lel according to the invention. In the embodiments shown it is assumed that - 4 the intrinsic safety range is at an output dc voltage of approx. 12 V from the intrinsically safe power supply and a maximum output current of 2 A. In this case, measurements on a spark gap at the output of line 2 show the length L Max of the type of line in question -ages and currents occurring during above which the volt a fault, e.g. a break in the line or a short-circuit, may be above the intrinsic safety range as a result of the line impedance. Lmax is the maximum permissible length oil line witnout exceeding the intrinsic safety values. According to the invention, tine line 2 is terminated by 27-ener diode 6 21n parallel with diode 7 immediately after the length L Max. A line length shorter than L Max can also be chosen according to the invention.
The Zener diode 6 is dimensioned so that its Zener voltage is approximately equal to the output voltage of 12V. Diode 7 is a fastacting diode having an inverse voltage of about 0.7 V. It is essential for the diode to be fast-acting.
As Fig. 2 shows, a system according invention comprising a number of loads 8 to the is made up of a series circuit comprising a number of individual line portions 2 and terminating at the end in a Zener diode and a diode connected in parallel. This ensures that in the event of a fault, no overvoltages or peak currents above the intrinsic safety range can occur at any part of the entire line. As a result of this inventive feature, an intrinsically safe line system for energy transmission can be given any desired 'length.
In mining, i.e. in longwall face working, energy transmission systems of this kind are made up of individual face supports connected in series. It is therefore advantageous if the -Individual intrinsically safe line portions 2 each have the same length, e.g. three metres. As a result of this feature according to the invention, the connections between individual face supports are limited only by the total power consumption, and if a fault occurs t-hrough a break in the line or a short-circuit, the intrinsic-safety parameters for the current and volt-=-ce cannot be exceeded because of the line impedance.
6
Claims (5)
1. An electric energy transmission system for intrinsically safe energy transmission, more especially for face support controls in mining, comprising an intrinsically safe power supply and an energy transmission line connected to a dc voltage output thereof and to at least one load, wherein the energy transmission line comprises at least one intrinsically safe portion terminated by a Zener diode having a Zener voltage equal to the maximum transmission voltage and connected in parallel with a diode for neutralising inverse voltages, the length of the line portion being less than or equal to the length of line determined by the line impedance and the intrinsic safety values for the voltage and current so that the energy transmission line can have any required length and be made intrinsically safe by connecting a corresponding number of line portions in series.
2. An energy transmission system according to claim 1, wherein the diode is a fast-acting diode.
1 7
3. An energy transmission system according to claim 1 or claim 2, wherein the cathodes of the zener diode and the diode are each connected to the positive terminal.
4. An energy transmission system according to any one of claims 1 - 3, wherein a number of loads are connected and the length of line to the first load is the sane between the loads and is equal to the length of the intrinsically safe line portion.
5. An energy transmission system according to claim 1 substantially as described herein with reference to Figure 1 or Figure 2 of the accompanying drawings.
Pub iedigg a., The Patent Office. State Ouse. 6671 High Holborn. London WC1R 4TP- Further copies maybe obtained from The Patent Office Sales Branch, St Mary Crav. OrPInglon. Rent BR5 3RD. Printed by Multiplex techmques ltd. St Mary Cray. Kent, Con 1-'87
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19893905772 DE3905772C2 (en) | 1989-02-24 | 1989-02-24 | Electrical energy transmission system for intrinsically safe energy transmission |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9004004D0 GB9004004D0 (en) | 1990-04-18 |
| GB2229872A true GB2229872A (en) | 1990-10-03 |
| GB2229872B GB2229872B (en) | 1993-10-06 |
Family
ID=6374860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9004004A Expired - Fee Related GB2229872B (en) | 1989-02-24 | 1990-02-22 | An electrical energy transmission system for intrinsically safe transmission of energy |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE3905772C2 (en) |
| GB (1) | GB2229872B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7863961B2 (en) * | 2004-09-30 | 2011-01-04 | Yazaki Corporation | Vehicle communication system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6618265B2 (en) * | 2001-10-01 | 2003-09-09 | Applied Materials, Inc. | Wiring arrangement ensuring all-or-none operation of a series of modular load elements |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1441808A (en) * | 1973-07-31 | 1976-07-07 | Coal Industry Patents Ltd | Intrinsically safe power supply apparatus |
| GB1495456A (en) * | 1974-03-06 | 1977-12-21 | Ducellier & Cie | Low consumption electronic apparatus |
| US4630162A (en) * | 1984-07-31 | 1986-12-16 | Texas Instruments Incorporated | ESD input protection circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2202638C2 (en) * | 1972-01-20 | 1975-04-03 | Honeywell Gmbh, 6000 Frankfurt | Voltage-reducing circuit arrangement connected to a Zener barrier |
| CA1307315C (en) * | 1988-12-08 | 1992-09-08 | Francis Yun-Tai Hung | Telephone protection circuit |
-
1989
- 1989-02-24 DE DE19893905772 patent/DE3905772C2/en not_active Expired - Fee Related
-
1990
- 1990-02-22 GB GB9004004A patent/GB2229872B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1441808A (en) * | 1973-07-31 | 1976-07-07 | Coal Industry Patents Ltd | Intrinsically safe power supply apparatus |
| GB1495456A (en) * | 1974-03-06 | 1977-12-21 | Ducellier & Cie | Low consumption electronic apparatus |
| US4630162A (en) * | 1984-07-31 | 1986-12-16 | Texas Instruments Incorporated | ESD input protection circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7863961B2 (en) * | 2004-09-30 | 2011-01-04 | Yazaki Corporation | Vehicle communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9004004D0 (en) | 1990-04-18 |
| GB2229872B (en) | 1993-10-06 |
| DE3905772C2 (en) | 1996-10-17 |
| DE3905772C1 (en) | 1990-09-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19940222 |