CN114930729A - Illuminated indicator device for a mining cable connector and mining cable connector comprising said illuminated indicator device - Google Patents
Illuminated indicator device for a mining cable connector and mining cable connector comprising said illuminated indicator device Download PDFInfo
- Publication number
- CN114930729A CN114930729A CN202080026476.6A CN202080026476A CN114930729A CN 114930729 A CN114930729 A CN 114930729A CN 202080026476 A CN202080026476 A CN 202080026476A CN 114930729 A CN114930729 A CN 114930729A
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- CN
- China
- Prior art keywords
- indicator device
- light emitting
- fuse
- pilot
- ground
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- 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.)
- Pending
Links
- 238000005065 mining Methods 0.000 title claims abstract description 17
- 230000001052 transient effect Effects 0.000 claims abstract description 6
- 229920002994 synthetic fiber Polymers 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 description 10
- 238000001514 detection method Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
Abstract
The present invention relates to a mining cable connector comprising a light emitting LED indicator device and a light emitting LED device indicating the status of a pilot-ground loop, wherein the light emitting indicator device comprises a GC terminal connected to a fuse; an output node of the fuse is connected to a transient voltage suppressor (TVC) diode and a driver, and the driver is connected to a lamp, in particular to a Light Emitting Diode (LED); the output nodes of the LED lamps are then connected to TVS and GND terminals, wherein the pilot and ground terminals of the circuit of the invention are adapted to be connected to the control (GC) and Ground (GND) cores of the mine cable by means of a connector and a junction box mechanically fastened to said connector.
Description
Technical Field
The invention belongs to the technical field of cable fault detection devices, and particularly relates to a light-emitting LED indicator device for a mine cable connector.
Background
In the prior art, there is a patent document US4228475A entitled "ground monitoring system" published in 10.14.1980, which describes such a device: the apparatus includes relays, transient voltage suppressors, zener diodes, band pass filters, drivers, transformers, generation of detection signals, current sources, etc. that facilitate detection and proper connection of ground cables to power cables of the type commonly used in open pit mining sites; which establishes a complete conductive loop between one or more ground cores and the control core of the ground check cable or cable. However, this precedent discloses a fixed position pilot-ground loop monitor relay (e.g., in a distribution substation) that injects a time varying signal at a frequency of 1 KHz; that is, it does not refer to a device that displays the state of the pilot-ground loop and is portable (because it is mounted on a connector). The aforementioned precedent relay performs the following functions: detecting when a fault occurs in said circuit and commanding the switch to open to cut off the supply of power through the cable; on the other hand, the luminous indicator of the invention does not inject any kind of signal into the circuit, nor does it disconnect any cut-off element. Moreover, this precedent does not allow to connect more than one luminous indicator on the same extension of the cable, so that it is not possible to know the status of the pilot-ground circuit on site, let alone it is not conducive to determining the location (site) of the fault.
It should be clear that throughout this text "connector" or "mine cable connector" is to be understood as any connection means between mine cables, such as couplers, splitters, etc., for field, mine pits or tunnels. Likewise, the terms "ground", "GND" and "G" are used to refer to the electrical connection to the system ground core, while the terms "lead", "ground check" and "GC" are used to refer to the electrical connection to the control core of the system.
Disclosure of Invention
The present invention has been developed in order to solve the above problems. The present invention relates to a mining cable connector comprising a light emitting LED indicator means, and a light emitting LED indicator means for displaying the status of a pilot-ground loop and adapted to be coupled to low and medium voltage mining cable connectors, wherein the light emitting indicator means comprises a GC terminal connected to a fuse; the output node of the fuse is connected to a transient voltage suppressor diode (TVS) and a current controller (driver) which is connected to a lamp, in particular to a Light Emitting Diode (LED), and then the output node of the LED lamp is connected to the TVS and GND terminals; wherein the pilot terminal and the ground terminal of the circuit of the invention are adapted to be connected to the control (GC) core and the Ground (GND) core of the mining cable by means of a connector and a junction box mechanically fastened to said connector.
Preferably, a cable connects each terminal of the circuit to the junction box; the junction box is then connected to the pilot and ground feeds of the connector using a cable covered with a synthetic fibre braid (preferably glass). The synthetic fiber braid coating is important because it improves the tensile strength of the junction box-feeder cable, which is relatively thin and may be subjected to some mechanical stress during assembly and disassembly of the connector. Finally, these connectors are connectors in direct electrical contact with the control and ground cores of the trailing cable.
The direct current signal from the pilot monitoring relay to the loop through the GC terminal and the GND terminal supplies power to the loop. In normal operation, the resistance of the fuse is negligible (short circuit) and the resistance of the TVS is very high (open circuit). Thus, it can be said that all power is supplied to the current controller and the LEDs. The current controller includes a constant current source implemented with active and passive components required to set the current, thereby causing the LEDs to illuminate significantly without affecting the normal operation of the pilot monitoring relay.
If an AC voltage is present between the GC terminal and GND terminal of the loop and is of sufficient magnitude to place the TVS in its polarized state, the TVS will change from its low conductive state to its high conductive state. This current will flow through the fuse and cause it to open (open). Therefore, the ac voltage will not damage the current controller or the LED lamp.
The invention has the following technical effects:
the illuminated indicator device is directly powered by the dc signal of the terminated pilot monitoring relay, so it does not require any additional power supply to operate.
The advantage of the light emitting indicator device is that it is placed directly in the path of the on-site, mining cable, since it is part of the connector. This facilitates the localization of wiring, connectors and faults.
The combination of the TVS and the fuse protects the current controller and the LED lamp from undesired external ac voltages. The TVS will generate enough current to open the fuse.
The luminous indicator device uses a constant current source to power the LED lamp, which makes it easier for the luminous intensity of the LED to remain constant in the face of dc voltage variations occurring in the ground-pilot line.
Drawings
As an addition to the description of the invention and to facilitate the understanding thereof, the present description is accompanied by a set of two figures which are part of it and in which the following preferred forms of the invention are detailed, by way of illustration and not of limitation:
fig. 1 shows a schematic view of a light-emitting LED indicator device and the connections between its components.
Fig. 2 shows three illuminated LED indicator devices connected between the supervisory relay loop of the pilot-ground loop and its terminals.
List of reference numerals:
1: the monitoring end of the pilot-ground loop is connected with the relay;
2: pilot/ground check wires in mining trailing cables;
3: a grounding wire core in the mining trailing cable;
4: monitoring a relay terminal;
5: a protection fuse of the LED indicator;
6: a transient voltage suppressor diode (TVS);
7: a driver to power the LED;
8: light Emitting Diodes (LEDs);
9: an illuminated LED indicator device (LED indicator).
Detailed Description
More specifically, the fuse 5 may be a delay type (time delay type) with an off current of 100 mA; it may also be of the PCB mounted type. However, the time-delay fuse can be replaced by a general fuse, and also can be replaced by a self-recovery fuse (polymer positive temperature coefficient (PPTC) fuse). The off current may be changed to any other value as long as the associated TVS 6 is capable of conducting the current in the presence of the defined alternating voltage.
The TVS 6 may be bi-directional, and its breakdown voltage V _ br may have at least the same value, of indeterminate duration, as the external voltage supported by the associated pilot monitoring relay 1. The TVS 6 may be replaced by a varistor as long as it is capable of carrying the cutoff current of the associated fuse in the presence of a defined alternating voltage.
The current controller (driver) 7 uses a constant current source and the passive and active components required to configure it, which can be done by a person skilled in the art. The constant current source may be of an integrated circuit type or may be implemented with discrete components. The value of the current to be configured will depend on the magnitude of the direct current injected into the pilot-ground circuit by the associated pilot monitoring relay 1. For example, a 300uA constant current source is configured for an injection current of 25 mA. On the other hand, a DC-DC converter having a constant current output may be used instead of the constant current source, and the DC-DC converter may supply the same current as the constant current source. Furthermore, the DC-DC converter must be in close proximity to the power conductors of the cable and connector to operate under electromagnetic conditions.
The Light Emitting Diode (LED)8 used is preferably of low current consumption, wherein the light intensity complies with at least 500mcd when the positive polarity current is 2 mA. Preferably, the color of the LED should be contrasted with the color of the connector; for example, if the connector is orange, a blue or green LED may be used.
The present invention is suitable for connection to the pilot monitoring relay 1. Although this relay is not an immediate part of the invention, it plays an important functional role and must therefore be mentioned here. The relay serves as the power supply and pilot-ground loop status signal for the present invention. The relay must work with the terminal 4 (zener, ordinary, impedance, etc.) and must inject a direct current into the pilot circuit. It must be able to provide a minimum voltage of 5VDC and a minimum current of 25 mA. The monitoring relay 1 performs two functions: power supply and loop status signals. The power supply function may be replaced by any other power means, such as a battery/accumulator, a system of power feed lines connected to connectors, or an energy harvesting/electromagnetic energy capture system.
Such a luminous indicator device 9 can be made available to the public, pre-installed in a connector for mining cables; also, it may be provided as part of a set of connector sub-components (aluminum cover and copper connector) for situations where the customer requires that the connector already in place be retained but wishes to add a lead LED lamp device.
Fig. 1 shows the elements of the luminous indicator device 9 and the connection of the luminous indicator device 9 to the ground-pilot relay circuit. It will be appreciated that the mining cable connector is arranged beside the light indicator device 9.
Fig. 2 shows an example of embodiment of the invention, illustrating that all the illuminated LED indicator devices (LED indicators) will be on when the pilot-ground loop is in good condition and the supervision relay is on. If a fault, such as a segmentation/disconnection/loss of continuity, occurs in the cable section designated as fault 1, all LEDs will be turned off. On the other hand, if such a fault occurs at the fault 3 location, only the LED indicator 3 will be off, while indicators 1 and 2 will remain on. If a short circuit fault occurs between ground and the pilot loop, all LED indicators will be turned off. Table 1 summarizes the status of each LED for two possible fault types in the loop for different positions.
All LEDs will be turned off only if the fault occurs in the fault 1 position, or if the fault is a short circuit between ground and the pilot loop. Finally, this explains how it is easier to locate a fault in the pilot-ground loop by using multiple LED indicators.
Claims (7)
1. A light-emitting indicator device for displaying the state of a pilot-ground circuit and suitable for use in mining cable connectors, characterized by comprising a pilot terminal connected to a fuse; an output node of the fuse is connected to a transient voltage suppressor diode and a current controller; the current controller is connected to the light emitting diode; finally, the output node of the light emitting diode is connected to the voltage suppressor diode and to a ground terminal.
2. The light emitting indicator device according to claim 1, wherein the fuse is of a delay type with an off current of 100 mA.
3. The light emitting indicator device of claim 1, wherein the fuse is a polymer fuse having a positive temperature coefficient.
4. The light emitting indicator device according to claim 1, wherein the voltage suppressor diode is replaced by a piezoresistor.
5. The light emitting indicator device according to claim 1, wherein the current controller employs a constant current source or a DC-DC converter having a constant current output and adapted to deliver the same current as the constant current source.
6. A mining cable connector characterized by comprising a junction box disposed in the connector; on the junction box, a luminous indicator device displaying the status is connected to the pilot-ground circuit; the light indicator device includes a pilot terminal connected to a fuse; an output node of the fuse is connected to a transient voltage suppressor diode and a current controller; the current controller is connected to the light emitting diode; finally, the output node of the light emitting diode is connected to the voltage suppressor diode and to a ground terminal.
7. A mining cable connector as claimed in claim 7, wherein the junction box is connected to the connector's pilot and ground feeds by a cable covered with a synthetic fibre braid.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/PE2020/050001 WO2021150128A1 (en) | 2020-01-20 | 2020-01-20 | Illuminated indicator device for mining cable connectors and a mining cable connector comprising said illuminated indicator device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114930729A true CN114930729A (en) | 2022-08-19 |
Family
ID=76992406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080026476.6A Pending CN114930729A (en) | 2020-01-20 | 2020-01-20 | Illuminated indicator device for a mining cable connector and mining cable connector comprising said illuminated indicator device |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN114930729A (en) |
| CA (1) | CA3134114A1 (en) |
| PE (1) | PE20211678A1 (en) |
| WO (1) | WO2021150128A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3676739A (en) * | 1971-09-07 | 1972-07-11 | Gen Electric | Mine power system ground continuity check circuit |
| US4228475A (en) * | 1978-08-28 | 1980-10-14 | Amf Incorporated | Ground monitoring system |
| CN208969200U (en) * | 2018-07-18 | 2019-06-11 | 兖州煤业股份有限公司 | A kind of monitor and coalcutter system of coalcutter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3728582A (en) * | 1971-12-23 | 1973-04-17 | Gulton Ind Inc | Ground continuity monitoring system |
| US4321643A (en) * | 1980-04-04 | 1982-03-23 | Amf Incorporated | Ground monitoring system |
-
2020
- 2020-01-20 WO PCT/PE2020/050001 patent/WO2021150128A1/en active Application Filing
- 2020-01-20 PE PE2021001298A patent/PE20211678A1/en unknown
- 2020-01-20 CA CA3134114A patent/CA3134114A1/en active Pending
- 2020-01-20 CN CN202080026476.6A patent/CN114930729A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3676739A (en) * | 1971-09-07 | 1972-07-11 | Gen Electric | Mine power system ground continuity check circuit |
| US4228475A (en) * | 1978-08-28 | 1980-10-14 | Amf Incorporated | Ground monitoring system |
| CN208969200U (en) * | 2018-07-18 | 2019-06-11 | 兖州煤业股份有限公司 | A kind of monitor and coalcutter system of coalcutter |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021150128A1 (en) | 2021-07-29 |
| PE20211678A1 (en) | 2021-08-31 |
| CA3134114A1 (en) | 2021-07-29 |
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