WO2016139624A1 - Electrical disconnecting arrangement - Google Patents

Electrical disconnecting arrangement Download PDF

Info

Publication number
WO2016139624A1
WO2016139624A1 PCT/IB2016/051213 IB2016051213W WO2016139624A1 WO 2016139624 A1 WO2016139624 A1 WO 2016139624A1 IB 2016051213 W IB2016051213 W IB 2016051213W WO 2016139624 A1 WO2016139624 A1 WO 2016139624A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrical
arrangement
circuit
earth
solar
Prior art date
Application number
PCT/IB2016/051213
Other languages
French (fr)
Inventor
Jean-Luc Lagarde
Original Assignee
Sicame South Africa (Pty) Ltd
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 Sicame South Africa (Pty) Ltd filed Critical Sicame South Africa (Pty) Ltd
Publication of WO2016139624A1 publication Critical patent/WO2016139624A1/en

Links

Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F77/00—Constructional details of devices covered by this subclass
    • H10F77/95—Circuit arrangements
    • H10F77/953—Circuit arrangements for devices having potential barriers
    • H10F77/955—Circuit arrangements for devices having potential barriers for photovoltaic devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/59—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the AC cycle
    • H01H33/596—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the AC cycle for interrupting DC
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
    • H01H31/003—Earthing switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
    • H01H31/26—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy

Definitions

  • the present invention relates to an electrical disconnecting arrangement.
  • the present invention relates to an electrical disconnecting arrangement for disconnecting solar and photovoltaic panels under load.
  • Disconnecting solar or photovoltaic panels is problematic as an electrical arc may be created during the operation. That is the reason why there is written on all solar photovoltaic installations not to disconnect under load.
  • a DC electrical current of 8 to 9A with current panels, and up to 25A in the case of problems, is circulating. This creates a problem for persons and hardware if disconnection is happening under load with the creation of an electrical arc.
  • the arc is particularly important with DC current more than with AC current.
  • the main problem is obviously the safety aspect due to flash over, electrical shocks, burns, etc.
  • an electrical disconnecting arrangement for an electrical circuit of a solar or photovoltaic electrical system includes earth connection means adapted create an earth connection during the intermediary position when opening the electrical circuit.
  • the earth connection means may include rotary and/or translating connection means.
  • the electrical disconnecting arrangement may be used to disconnect junction(s) between two solar or photovoltaic panels.
  • the electrical disconnecting arrangement may be used to avoid electrical arcs.
  • the electrical disconnecting arrangement may be operated by means of a hook.
  • Figure 1 the electrical layout of a normal close electrical circuit position with circuit breaker connected
  • Figure 2 the electrical layout during the intermediary position with connection to earth according to the invention.
  • Figure 3 the electrical layout during safe open electrical circuit connection to earth.
  • an electrical disconnecting arrangement for an electrical circuit of a solar or photovoltaic electrical system includes earth connection means adapted create an earth connection during the intermediary position when opening the electrical circuit.
  • the earth connection means is shown to be connected by way of a current connector, and in Figure 3 the circuit is interrupted or open.
  • the earth connection means include rotary and/or translating connection means.
  • the electrical disconnecting arrangement can be used to disconnect junction(s) between two solar or photovoltaic panels.
  • the electrical disconnecting arrangement can be used to avoid electrical arcs.
  • the electrical disconnecting arrangement can be operated by means of a hook.
  • the invention thus utilises the electrical characteristic of solar or photovoltaic panels of which electrical generation efficiency drops rapidly to zero when in open circuit and earthed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Photovoltaic Devices (AREA)

Abstract

The invention discloses an electrical disconnecting arrangement for an electrical circuit of a solar or photovoltaic electrical system, which includes earth connection means adapted create an earth connection during the intermediary position when opening the electrical circuit. The earth connection means include rotary and/or translating connection means. Once the electrical circuit is open, there is safe open circuit connection to earth.

Description

ELECTRICAL DISCONNECTING ARRANGEMENT
FIELD OF INVENTION
The present invention relates to an electrical disconnecting arrangement.
More particularly, the present invention relates to an electrical disconnecting arrangement for disconnecting solar and photovoltaic panels under load.
BACKGROUND TO INVENTION
Disconnecting solar or photovoltaic panels is problematic as an electrical arc may be created during the operation. That is the reason why there is written on all solar photovoltaic installations not to disconnect under load. When the solar or photovoltaic panels are generating current (except at night), a DC electrical current of 8 to 9A with current panels, and up to 25A in the case of problems, is circulating. This creates a problem for persons and hardware if disconnection is happening under load with the creation of an electrical arc. The arc is particularly important with DC current more than with AC current. The main problem is obviously the safety aspect due to flash over, electrical shocks, burns, etc.
It is an object of the invention to suggest an electrical disconnecting arrangement, which will assist in overcoming these problems and shortcomings.
SUMMARY OF INVENTION
According to the invention, an electrical disconnecting arrangement for an electrical circuit of a solar or photovoltaic electrical system, includes earth connection means adapted create an earth connection during the intermediary position when opening the electrical circuit.
The earth connection means may include rotary and/or translating connection means.
Once the electrical circuit is open there may be safe open circuit connection to earth.
The electrical disconnecting arrangement may be used to disconnect junction(s) between two solar or photovoltaic panels.
The electrical disconnecting arrangement may be used to avoid electrical arcs. The electrical disconnecting arrangement may be operated by means of a hook. BRIEF DESCRIPTION OF DRAWINGS
The invention will now be described by way of example with reference to the accompanying schematic drawings.
In the drawings there is shown in:
Figure 1 : the electrical layout of a normal close electrical circuit position with circuit breaker connected;
Figure 2: the electrical layout during the intermediary position with connection to earth according to the invention; and
Figure 3: the electrical layout during safe open electrical circuit connection to earth. DETAILED DESCRIPTION OF DRAWINGS
Referring to the drawings, an electrical disconnecting arrangement for an electrical circuit of a solar or photovoltaic electrical system, includes earth connection means adapted create an earth connection during the intermediary position when opening the electrical circuit.
In Figure 2, the earth connection means is shown to be connected by way of a current connector, and in Figure 3 the circuit is interrupted or open.
The earth connection means include rotary and/or translating connection means.
Once the electrical circuit is open there is safe open circuit connection to earth.
The electrical disconnecting arrangement can be used to disconnect junction(s) between two solar or photovoltaic panels.
The electrical disconnecting arrangement can be used to avoid electrical arcs.
The electrical disconnecting arrangement can be operated by means of a hook.
The invention thus utilises the electrical characteristic of solar or photovoltaic panels of which electrical generation efficiency drops rapidly to zero when in open circuit and earthed.
In order to avoid the creation of the electrical arc when opening the circuit the disconnection happens with connection to earth during the transient phase.

Claims

PATENT CLAIMS
1 . An electrical disconnecting arrangement for an electrical circuit of a solar or photovoltaic electrical system, which includes earth connection means adapted create an earth connection during the intermediary position when opening the electrical circuit.
2. An arrangement as claimed in claim 1 , in which the earth connection means include rotary and/or translating connection means.
3. An arrangement as claimed in claim 1 or claim 2, in which, once the electrical circuit is open, there is safe open circuit connection to earth.
4. An arrangement as claimed in any one of the preceding claims, which is adapted to be used to disconnect junction(s) between two solar or photovoltaic panels.
5. An arrangement as claimed in any one of the preceding claims, which is adapted to be used to avoid electrical arcs.
6. An arrangement as claimed in any one of the preceding claims, which is adapted to be operated by means of a hook.
7. An electrical disconnecting arrangement for an electrical circuit of a solar or photovoltaic electrical system substantially as hereinbefore described with reference to the accompanying drawings.
PCT/IB2016/051213 2015-03-04 2016-03-04 Electrical disconnecting arrangement WO2016139624A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA2015/01462 2015-03-04
ZA201501462 2015-03-04

Publications (1)

Publication Number Publication Date
WO2016139624A1 true WO2016139624A1 (en) 2016-09-09

Family

ID=56849305

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2016/051213 WO2016139624A1 (en) 2015-03-04 2016-03-04 Electrical disconnecting arrangement

Country Status (1)

Country Link
WO (1) WO2016139624A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4536659A (en) * 1983-09-20 1985-08-20 Nwl Transformers Visible disconnect/ground switch
US20100326809A1 (en) * 2009-05-25 2010-12-30 Eaton Industries Gmbh Safety switchgear for solar plants
CN202473669U (en) * 2012-02-29 2012-10-03 广州华成电器股份有限公司 Grounding interlocking mechanism of electrical cabinet
WO2015028948A1 (en) * 2013-08-28 2015-03-05 Sicame South Africa (Pty) Ltd Solar disconnecting arrangement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4536659A (en) * 1983-09-20 1985-08-20 Nwl Transformers Visible disconnect/ground switch
US20100326809A1 (en) * 2009-05-25 2010-12-30 Eaton Industries Gmbh Safety switchgear for solar plants
CN202473669U (en) * 2012-02-29 2012-10-03 广州华成电器股份有限公司 Grounding interlocking mechanism of electrical cabinet
WO2015028948A1 (en) * 2013-08-28 2015-03-05 Sicame South Africa (Pty) Ltd Solar disconnecting arrangement

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