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EP-4402491-B1 - A POWER ANALYZER FOR MAINS SWITCHGEAR

EP4402491B1EP 4402491 B1EP4402491 B1EP 4402491B1EP-4402491-B1

Inventors

  • Ballikaya, Melih
  • GUNAY, Selman
  • CELIKKAYA, Recep
  • SOTOUDEH, Naghi

Dates

Publication Date
20260513
Application Date
20210917

Claims (14)

  1. A power analyzer (10) for mains switchgear (S) comprising, - a main body (20), - at least one housing (21) which is formed on the main body (20), suitable for inserting the respective cable (C) of the mains switchgear (S), - a magnetic sensor (30) provided on the main body (20) configured for measuring a magnetic field value present in the housing (21) when the respective cable (C) of the mains switchgear (S) is inserted into the housing (21) characterized in that - a position sensor (40) is provided on the main body (20) configured for determining a distance value between the cable (C) and the magnetic sensor (30) and - a control unit (50) that is configured to calculate the current value which flows in the cable (C) by using the distance value and the magnetic field value.
  2. The power analyzer (10) according to Claim 1, wherein the housing (21) has two opposite side walls (22) and a bottom wall (23).
  3. The power analyzer (10) according to Claim 1 or 2, wherein the position sensor (40) is an optical sensor.
  4. The power analyzer (10) according to Claim 3, wherein the optical sensor has a transmitter (41) which is provided on the side wall (22) and a receiver (42) which is provided on the opposite side wall (22) to sense the light.
  5. The power analyzer (10) according to Claim 2 - 4, wherein the magnetic sensor (30) is provided on the bottom wall (23) of the housing (20).
  6. The power analyzer (10) according to Claim 2 - 5, wherein at least one side wall (22) is provided with a cable holder (24).
  7. The power analyzer (10) according to any of the preceding claims, wherein the main body (20) comprises three housings (21).
  8. The power analyzer (10) according to any of the preceding claims, wherein a wireless communication module (60) is provided on the main body (20).
  9. The power analyzer (10) according to any of the preceding claims, wherein a voltage sensing means (70) is adapted to collect a voltage signal from the mains switchgear (S) for measuring the voltage value of the mains switchgear (S) and the control unit (50) is adapted to calculate power value by multiplying the voltage value and the current value.
  10. The power analyzer (10) according to Claim 9, wherein at least three voltage sensing means (70) are connected to the main body (20).
  11. The power analyzer (10) according to Claim 9 or 10, wherein the voltage sensing means (70) are detachably attached each other.
  12. The power analyzer (10) according to Claim 11, wherein the voltage sensing means (70) has an outer body (71) which is provided with a protrusion (72) and a corresponding recess (73), both of the protrusion (72) and the recess (73) are being sized and shaped to engage each other when the voltage sensing means (70) are attached each other.
  13. The power analyzer (10) according to any of the preceding claims, wherein the control unit (50) is configured to generate a warning signal when the control unit (50) determines that the position of the cable (C) in the housing (21) is changed.
  14. The power analyzer (10) according to any of the preceding claims, wherein a display is used for displaying at least one parameter which is determined by the control unit (50).

Description

Technical Field of the Invention The present invention relates to a power analyzer which is suitable to use on the mains switchgear. Background of the Invention A power analyzer is the equipment which used to monitor the electrical parameters of the mains switchgear. Power analyzers can be used to measure the flow of energy in either alternating current (AC) or direct current (DC) systems. The power analyzer in the state of the art, the current value is determined by a current sensor. When the current value is determined by only one sensor, the measurement precision of the current value is decreased. A prior art publication in the technical field of the invention may be referred to as EP3384576 (A1), which discloses a power analyzer. DE 102013106216 A1 relates to a measuring device for current measurement in a control cabinet. Said measuring device comprises at least one current sensor and is designed as a comb rail into which the at least one current sensor is integrated. The document further disclosed a use of such a measuring device (10) in connection with a photovoltaic system which is designed to use its own energy. WO 2020/049883 A1 discloses a non-clamp-form electric current measurement apparatus with which it is possible to measure a current in an electrical wire to be measured without clamping the electrical wire to be measured. The disclosed apparatus comprises a proximity sensor that acquires information pertaining to the distance from an electrical wire to be measured to a conductor, and a magnetism sensor that acquires information pertaining to a magnetic field produced due to a current flowing to the electrical wire to be measured. A measurement apparatus body comprises a CPU serving as a computation processing circuit that computes a current value flowing to the electrical wire to be measured from the information pertaining to a magnetic field as acquired by the magnetism sensor and the information pertaining to the distance from the electrical wire to be measured to the conductor as acquired by the proximity sensor. US 2021/088557 A1 discloses a current measuring device includes two triaxial magnetic sensors that are arranged with a prescribed gap between the the two triaxial magnetic sensors such that magnetic-sensing directions of the two triaxial magnetic sensors are parallel to each other, and a calculator configured to calculate a current flowing in a measurement-object conductor based on detection results from the two triaxial magnetic sensors and a gap between the two triaxial magnetic sensors. The invention provides an additional improvement to the prior art. Summary of the Invention An object of the present invention is to determine the current value which flows in the cable of the mains switchgear in an accurate manner. The present invention proposes a power analyzer for mains switchgear comprising, a main body, at least one housing which is formed on the main body, suitable for inserting the respective cable of the mains switchgear, a magnetic sensor provided on the main body for measuring a magnetic field value present in the housing when the respective cable of the mains switchgear is inserted into the housing. The power analyzer comprises a position sensor is provided on the main body for determining a distance value between the cable and the magnetic sensor and a control unit that is configured to calculate the current value which flows in the cable by using the distance value and the magnetic field value. A position sensor is a sensor that facilitates measurement of mechanical position. A position sensor may indicate absolute position (location) or relative position (displacement), in terms of linear travel, rotational angle, or three-dimensional space. The position sensor may be a capacitive displacement sensor or a differential capacitive sensor or an eddy current sensor or a laser sensor or a photodiode array or a hall effect sensor or an inductive sensor or an infrared sensor or a piezo-electric transducer or a position encoder or an ultrasound sensor or a RGB color space sensor or a time-of-flight sensor or an optical sensor or a camera or a stereo-camera or a lidar. The distance between the magnetic sensor and the outer surface of the cable can be determined by the position sensor. Since the magnetic sensor is fixed on the main body, the distance can be determined by the control unit after the cable position is determined by the position sensor. Moreover, detection of the presence or absence of the cable in the housing can be determined by means of the position sensor. The magnetic sensor may be an inductive sensor. In the preferred embodiment of the present invention, the magnetic sensor is a hall effect sensor. The magnetic sensor measures the value of the magnetic field which is created by the cable wherein the current flows. The control unit calculates the current value which flows in the cable by using the magnetic field value and the distance value. Since the dist