System for detecting and indicating partial discharges and voltage in high-voltage electric power distribution systems

Abstract

A system for detecting and indicating partial discharges and voltage. The system allows capturing signals from the electric power system and/or the electrical equipment thereof, and detecting and indicating the presence or absence of partial discharges and voltage, which allows carrying out a quick and simple inspection in order to prevent faults in the distribution elements, preventing risks and performing suitable installation maintenance.

Claims

1. A system for detecting and indicating partial discharges and voltage in a high-voltage electric power distribution system, or an installation, which includes electrical equipment, the system comprising: a) at least one capacitive voltage tap integrated in the electrical equipment and configured to capture signals from the power distribution system; b) at least a first circuit integrated in the electrical equipment and configured for measuring/detecting and indicating presence or absence of voltage in the power distribution system; and c) at least a second circuit for detecting and indicating partial discharges, electrically connected to the capacitive voltage tap and to the first circuit for measuring or detecting and indicating a presence or an absence of voltage; wherein the system is configured for the capacitive voltage tap to provide the voltage signal for the first circuit and for the second circuit, such that starting from the voltage signal, the system indicates the presence or absence of voltage and/or the presence or absence of partial discharges; wherein the capacitive voltage tap is integrated in at least one bushing of the electrical equipment; wherein the first circuit comprises at least one voltage measuring element and at least one voltage signal detector and indicator; wherein the second circuit is connected to the voltage measuring element or to the voltage signal detector and indicator; and wherein the second circuit for detecting and indicating partial discharges comprises at least one signal amplifying or rectifying element, at least one peak detector element and/or at least one integrator element.

2. The system according to claim 1, wherein the voltage measuring element is galvanically insulated from the capacitive voltage tap.

3. The system according to claim 1, wherein the first circuit and the second circuit are integrated in a same casing comprising at least one display, the casing being integrated in the electrical equipment.

4. The system according to claim 3, wherein the second circuit is self-powered by the capacitive voltage tap.

5. The system according to claim 4, wherein the second circuit is powered through a battery or any other external power supply source outside the electrical equipment.

6. The system according to claim 4, further comprising a third phase comparing circuit arranged inside the second casing which, regardless of the second circuit for detecting and indicating partial discharges, is configured for indicating a phase concordance between electrical equipment.

7. The system according to claim 1, wherein the first circuit for measuring or detecting and indicating the presence or absence of voltage is integrated in a first casing comprising at least one display, and the second circuit for detecting and indicating partial discharges is integrated in a second casing comprising at least another display, the first casing being integrated in the electrical equipment.

8. The system according to claim 1, comprising at least one communications outlet for remote verification of the absence or presence of partial discharges and voltage in the installation.

9. The system according to claim 1, comprising a first circuit for measuring or detecting and indicating the presence or absence of voltage and a second independent circuit for detecting and indicating partial discharges for each of the phases of the electrical equipment.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a block diagram of the system for detecting and indicating partial discharges and voltage of the disclosure herein.

(2) FIG. 2 shows a block diagram of the system for detecting and indicating partial discharges and voltage according to a first embodiment of the disclosure herein.

(3) FIG. 3 shows a block diagram of the system for detecting and indicating partial discharges and voltage according to a second embodiment of the disclosure herein.

(4) FIG. 4a shows a block diagram of the circuit for detecting and indicating partial discharges, self-powered by a capacitive voltage tap.

(5) FIG. 4b shows a block diagram of the circuit for detecting and indicating partial discharges, powered through a battery or any other external power supply source.

(6) FIG. 5 shows a perspective view of electrical equipment comprising the system for detecting and indicating partial discharges and voltage integrated therein.

(7) FIG. 6 shows a perspective view of electrical equipment comprising, integrated therein, the first circuit for measuring/detecting and indicating the presence/absence of voltage inside a first casing, whereas the second circuit for detecting and indicating partial discharges incorporated inside a second casing is shown as a portable element.

DETAILED DESCRIPTION

(8) Several preferred embodiments are described below in reference to the aforementioned drawings, without limiting or reducing the scope of protection of the present disclosure.

(9) FIG. 1 shows a block diagram reflecting the system (16) for detecting and indicating partial discharges and voltage, object of the present disclosure. The system (16) comprises at least one capacitive voltage tap (1), at least a first circuit (A) for measuring/detecting and indicating the presence/absence of voltage and at least a second circuit (B) for detecting and indicating partial discharges, the three blocks being electrically connected. The capacitive voltage tap (1) provides the voltage signal for the first circuit (A) and for the second circuit (B), such that starting from this voltage signal, the system (16) can indicate the presence or absence of voltage and/or the presence or absence of partial discharges.

(10) As mentioned, the voltage signal is captured through a capacitive voltage tap (1) which is integrated in at least one bushing (3) of at least one piece of electrical equipment (2), as can be seen in FIGS. 5 and 6.

(11) According to a first embodiment of the disclosure herein shown in FIG. 2, the first circuit (A) for measuring/detecting and indicating the presence/absence of voltage comprises at least one voltage measuring element (4), such as for example, a low-voltage transformer, and also comprises at least one voltage signal detector and indicator (5) that can detect and indicate voltage signal. According to this first embodiment, the second circuit (B) for detecting and indicating partial discharges is connected to the voltage measuring element (4).

(12) According to a second embodiment of the disclosure herein shown in FIG. 3, the first circuit (A) for measuring/detecting and indicating the presence/absence of voltage comprises at least one voltage measuring element (4), such as for example, a low-voltage transformer, and also comprises at least one voltage signal detector and indicator (5) that can detect and indicate voltage signal. According to this second embodiment, the second circuit (B) for detecting and indicating partial discharges is connected to the voltage signal detector and indicator (5).

(13) In both embodiments of the disclosure herein, the second circuit (B) comprises at least one signal amplifying/rectifying element (6), at least one peak detector element (8) and/or at least one integrator element (9), as shown in FIGS. 4a and 4b.

(14) As can be seen in FIG. 5, the system (16) of the disclosure herein is integrated in the electrical equipment (2), such as for example, an electric cell. In this sense, the first circuit (A) and the second circuit (B) are incorporated inside one and the same casing (11), which is in turn integrated in the electrical equipment (2) as shown in FIG. 5. The casing (11) comprises at least one display (10) indicating the presence or absence of partial discharges, indicating the presence or absence of voltage in the installation also being possible. In this case, the second circuit (B) for detecting and indicating partial discharges is self-powered by the capacitive voltage tap (1), as shown in FIG. 4a, or by at least another internal power supply source inside the electrical equipment (2).

(15) On the other hand, the possibility that the first circuit (A) is being incorporated in a first casing (12) and the second circuit (B) is being incorporated in a second casing (13) has also been contemplated, each of these casings (12, 13) comprising its own display (14, 15), respectively, as shown in FIG. 6. The first casing (12) is thus integrated in the electrical equipment (2), and therefore, the first circuit (A) is also integrated in the electrical equipment (2), whereas the second casing (13) incorporating the second circuit (B) is independent of the electrical equipment (2), designed as a portable element which can be connected to the casing (12) for detecting and indicating the presence or absence of partial discharges. In this case, the second circuit (B) is powered through a battery or any other external power supply source (7) outside the electrical equipment (2), as shown in FIG. 4b.

(16) Finally, as shown in FIGS. 2, 3, 4a and 4b, the system (16) herein described can comprise at least one communications outlet (17) which allows remote and easy (visually and/or audibly) verification of the presence or absence of partial discharges and voltage in the installation.