ES2537131A1 - Method and directional system for the detection of ground faults in isolated direct current networks (Machine-translation by Google Translate, not legally binding) - Google Patents
Method and directional system for the detection of ground faults in isolated direct current networks (Machine-translation by Google Translate, not legally binding) Download PDFInfo
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- ES2537131A1 ES2537131A1 ES201431916A ES201431916A ES2537131A1 ES 2537131 A1 ES2537131 A1 ES 2537131A1 ES 201431916 A ES201431916 A ES 201431916A ES 201431916 A ES201431916 A ES 201431916A ES 2537131 A1 ES2537131 A1 ES 2537131A1
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- intensity
- detection
- ground faults
- direct current
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- 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
- G01R31/088—Aspects of digital computing
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
Description
P201431916 P201431916
23-12-2014 12-23-2014
aislados, ni recoge una lectura ni análisis de las corrientes que circulan por las pantallas de los cables protegidos. isolated, neither collects a reading nor analysis of the currents that circulate through the screens of the protected cables.
-La presente invención soluciona el problema de detectar una falta a tierra de forma selectiva en redes eléctricas con cables aislados en corriente continua, con la ventaja de que la medida de la corriente en las pantallas es más sencilla que en el propio conductor, ya que la tensión de aislamiento requerida para el equipo de medida es muy inferior comparada con la tensión de aislamiento requerida si se midiera en el cable aislado. -The present invention solves the problem of detecting a ground fault selectively in electrical networks with insulated cables in direct current, with the advantage that the measurement of current in the screens is simpler than in the conductor itself, since The insulation voltage required for the measuring equipment is much lower compared to the required insulation voltage if measured on the insulated cable.
A continuación se pasa a describir de manera muy breve una serie de dibujos que ayudan a comprender mejor la invención y que se relacionan expresamente con una realización de dicha invención que se presenta como un ejemplo no limitativo de ésta. A series of drawings that help to better understand the invention and that expressly relate to an embodiment of said invention which is presented as a non-limiting example thereof is described very briefly below.
FIGURA 1.-Muestra una red de alimentación en corriente continua, según se conoce en el estado de la técnica. FIGURE 1.- Shows a power supply network in direct current, as is known in the state of the art.
FIGURA 2.-Muestra un esquema simplificado de bloques de un sistema de protección frente a defectos a tierra aplicado a la red de corriente continua la Figura 1, según una realización preferente de la invención. FIGURE 2.- Shows a simplified block diagram of a ground fault protection system applied to the direct current network of Figure 1, according to a preferred embodiment of the invention.
FIGURA 3.-Muestra un esquema simplificado de bloques de un sistema de detección de defectos a tierra del cable aislado, según una primera posible realización de la invención. FIGURE 3.- It shows a simplified block diagram of a ground fault detection system of the insulated cable, according to a first possible embodiment of the invention.
FIGURA 4.-Muestra un esquema simplificado de bloques de un sistema de detección de defectos a tierra del cable aislado, según una segunda posible realización de la invención. FIGURE 4.- Shows a simplified block diagram of a ground fault detection system of the insulated cable, according to a second possible embodiment of the invention.
FIGURA 5.-Muestra un esquema simplificado de bloques de un sistema de detección de defectos a tierra del cable aislado, según una tercera posible realización de la invención. FIGURE 5.- Shows a simplified block diagram of a ground fault detection system of the insulated cable, according to a third possible embodiment of the invention.
FIGURA 6.-Muestra un esquema simplificado de bloques de un sistema de detección de defectos a tierra del cable aislado, según una cuarta posible realización de la invención. FIGURE 6.- Shows a simplified block diagram of a ground fault detection system of the insulated cable, according to a fourth possible embodiment of the invention.
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P201431916 P201431916
23-12-2014 12-23-2014
Si la intensidad leída/medida (13) en la pantalla es superior a la del ajuste (14), el comparador/divisor (15) envía una señal de arranque al calculador de tiempo de disparo (21) en función de la intensidad leída (13) y de ajuste (14). En caso de superarse el tiempo calculado, se indica con un uno lógico en la salida de dicho calculador de tiempo (21). Si las polaridades de la intensidad (16) que circula por la pantalla (4) del cable (3) es igual a la polaridad de la tensión (17) del cable de alimentación, el comparador (18) presenta un uno lógico en su salida. Si la puerta lógica (22) tiene activadas sus dos entradas, se obtiene una señal que indica que hay defecto (19) con un uno lógico en su salida. If the intensity read / measured (13) on the screen is higher than the setting (14), the comparator / divider (15) sends a start signal to the trip time calculator (21) based on the intensity read ( 13) and adjustment (14). If the calculated time is exceeded, it is indicated with a logical one at the output of said time calculator (21). If the polarities of the intensity (16) that circulates on the screen (4) of the cable (3) is equal to the polarity of the voltage (17) of the power cable, the comparator (18) presents a logical one at its output . If the logic gate (22) has its two inputs activated, a signal is obtained indicating that there is a defect (19) with a logical one at its output.
En la Figura 6 se muestra otra posible realización del sistema de detección de defectos a tierra que dispone de los mismos elementos que en la Figura 5 y además comprende: (23): Comparador de módulo. Si su entrada es constante, su salida también lo es. (24): Puerta lógica “Y” de tres entradas. Figure 6 shows another possible embodiment of the ground fault detection system that has the same elements as in Figure 5 and also comprises: (23): Module comparator. If your input is constant, your output is also constant. (24): Logic gate “Y” of three inputs.
El módulo evaluador de signo (23) comprueba que la polaridad de la intensidad (16) que circula por la pantalla del cable aislado es, o bien siempre positiva o bien siempre negativa; y si es así, si es siempre positiva o siempre negativa, la salida del evaluador de signo (23) es un uno lógico. Si dicha salida, y la del comparador (18) y la del divisor (15), son unos lógicos, la puerta lógica de tres entradas (24) se activa, activando a su vez al temporizador (20). Si al expirar el tiempo ajustado en el temporizador (20) la puerta lógica (24) sigue activada, se indica defecto (19). The sign evaluator module (23) checks that the polarity of the intensity (16) that circulates through the insulated cable screen is either always positive or always negative; and if so, if it is always positive or always negative, the output of the sign evaluator (23) is a logical one. If said output, and that of the comparator (18) and that of the divider (15), are logical, the three-input logic gate (24) is activated, in turn activating the timer (20). If the logic door (24) remains activated when the time set in the timer (20) expires, defect (19) is indicated.
En la Figura 7 se muestra otra posible realización del sistema de detección de defectos a tierra que dispone de los mismos elementos que en la Figura 6, incluidos los de las Figuras 3, 4 y 5, y además comprende: Figure 7 shows another possible embodiment of the ground fault detection system that has the same elements as in Figure 6, including those in Figures 3, 4 and 5, and also includes:
(25): Calculador de la pendiente de la intensidad (13) que circula por la pantalla (4) del cable (3). (26): Puerta lógica inversora. (25): Calculator of the slope of the intensity (13) that circulates on the screen (4) of the cable (3). (26): Reversing logic gate.
En la Figura 7 se observa que si la polaridad de la tensión (17) de alimentación del cable y la pendiente de la intensidad (13) de defecto obtenida por el calculador (25) son positivas, y la salida del divisor (15) de señal es un uno lógico, la puerta lógica de tres entradas (24) activa el temporizador (20) e indica fallo en el cable (19) cuando ha expirado el tiempo fijado en el temporizador (20). Si la polaridad de la tensión de alimentación (17) y la pendiente de la intensidad (13) fueran negativas, las puertas lógicas inversoras (26) cambian sus valores a Figure 7 shows that if the polarity of the supply voltage (17) of the cable and the slope of the default intensity (13) obtained by the calculator (25) are positive, and the output of the divider (15) of Signal is a logical one, the three-input logic gate (24) activates the timer (20) and indicates failure in the cable (19) when the time set in the timer (20) has expired. If the polarity of the supply voltage (17) and the slope of the intensity (13) were negative, the inverting logic gates (26) change their values to
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Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES201431916A ES2537131B2 (en) | 2014-12-23 | 2014-12-23 | Method and directional system for detecting ground defects in DC networks of insulated cables |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES201431916A ES2537131B2 (en) | 2014-12-23 | 2014-12-23 | Method and directional system for detecting ground defects in DC networks of insulated cables |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| ES2537131A1 true ES2537131A1 (en) | 2015-06-02 |
| ES2537131B2 ES2537131B2 (en) | 2016-10-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES201431916A Active ES2537131B2 (en) | 2014-12-23 | 2014-12-23 | Method and directional system for detecting ground defects in DC networks of insulated cables |
Country Status (1)
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| ES (1) | ES2537131B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2374345A1 (en) * | 2010-04-21 | 2012-02-16 | Universidad Politécnica de Madrid | System and non-directional protection method for selective detection of land faults in networks with isolated neutral. (Machine-translation by Google Translate, not legally binding) |
| EP2687860A1 (en) * | 2012-07-20 | 2014-01-22 | Schneider Electric Industries SAS | Directional detection of a sensitive medium-voltage earth fault by linear correlation |
-
2014
- 2014-12-23 ES ES201431916A patent/ES2537131B2/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2374345A1 (en) * | 2010-04-21 | 2012-02-16 | Universidad Politécnica de Madrid | System and non-directional protection method for selective detection of land faults in networks with isolated neutral. (Machine-translation by Google Translate, not legally binding) |
| EP2687860A1 (en) * | 2012-07-20 | 2014-01-22 | Schneider Electric Industries SAS | Directional detection of a sensitive medium-voltage earth fault by linear correlation |
Non-Patent Citations (1)
| Title |
|---|
| GRANIZO R; BLANQUEZ F R; REBOLLO E; PLATERO C A. New selective earth faults only current directional method for isolated neutral systems. Conference on Environment and Electrical Engineering (EEEIC), 2012 11th International . 18.05.2012. Pg 451-455. http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6221420 * |
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| Publication number | Publication date |
|---|---|
| ES2537131B2 (en) | 2016-10-07 |
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