JP5807748B2 - Abnormality detection device in distribution board - Google Patents

Description

  The present invention relates to an apparatus for detecting an abnormality in a distribution board by detecting an excessive increase in temperature in the distribution board.

  In steelworks, etc., once the power supplied from the high voltage line is received by the distribution board, the high voltage of the power is lowered to the operating voltage of normal equipment by the transformer in the distribution board, and excessive current flows in the distribution circuit. In such a case, the distribution circuit is shut off by the circuit breaker in the distribution board.

  In such a power distribution board, a charging unit in which a metal terminal that is insulated and supported by a lever from the casing of the power distribution board and is fed with a high-voltage three-phase AC high voltage by an insulation-coated cable is exposed, There are internal wirings such as busbars made of exposed metal rods connecting the charging unit and the transformer, between the transformer and the circuit breaker, between the circuit breaker and the power distribution terminal, respectively.

  On the other hand, in the distribution board, dust collected over a long period of time may absorb moisture, or the insulation may deteriorate due to aging and cracking of the insulator. If electricity leaks due to a decrease in the temperature, it may generate heat and cause a fire. Particularly in the charging section, the supplied voltage is as extremely high as, for example, 3.3 kV. Therefore, when electric leakage occurs, there is a high possibility that a high heat is generated and a fire occurs.

  By the way, conventionally, as described in Patent Document 1, for example, an abnormality detection device is known in which a gas sensor is provided for each unit in a plurality of units in a power distribution board, and an output obtained by connecting the gas sensors in series is input to an alarm device. ing.

JP 05-015882 A

  However, in the above-described conventional abnormality detection device, there is a problem that an abnormality in the distribution board cannot be detected unless a fire occurs and gas is generated, and damage to cables and equipment in the distribution board cannot be avoided. .

  Therefore, it has been considered to detect anomalies by detecting temperature rise in the distribution board, but temperature measurement equipment such as a thermoviewer is expensive and the distribution board door must be open. In other words, there was a problem that the temperature measurement and thus the abnormality could not be detected.

  Therefore, an object of the present invention is to provide an anomaly detection device that can be installed at low cost, can detect an anomaly even when the door of the distribution board is closed, and can avoid damage to cables and equipment due to a fire. To do.

To achieve the above object, the abnormality detection device in the distribution board of the present invention,
In the housing of the power distribution board, secure a safe separation distance from the energized location in the housing and wire two types of metal wires,
One end portions of these two types of metal wires are electrically connected in the vicinity of the heat detection target in the housing, ensuring a safe separation distance from the heat detection target,
Route these two types of metal wires out of the housing,
The other end of the two types of metal wires is connected to the electromotive force detection means outside the casing,
Based on the thermoelectromotive force due to the Seebeck effect of the two types of metal wires detected by the electromotive force detection unit using the connection portion between the other end of the two types of metal wires and the electromotive force detection unit as a reference contact. An abnormality due to heat generation of the heat detection target is detected and notified.

In the power distribution board abnormality detection device of the present invention, for example, two types of metal wires, such as copper and iron, are wired in the power distribution board housing while ensuring a safe separation distance from the energized location in the housing. Since one end of the two types of metal wires is electrically connected in the vicinity of the heat generation detection target in the housing with a safe separation distance from the heat generation detection target, the connection point is heat generation. When the detection target generates heat due to electric leakage, the temperature is increased by receiving the heat by radiation, convection or the like. On the other hand, the two types of metal wires are routed outside the casing, and the other end portions of the two types of metal wires outside the casing are maintained at room temperature (outside temperature) because they are outside the casing. has a connection has been standard contacts, therefore, a temperature difference between the temperature to one end portion temperature and the room temperature of the other end of the two kinds of metal wire, the other end portion thereof two types of metal wires by the Seebeck effect The electromotive force is generated, and the electromotive force detection means detects an abnormality due to the heat generation of the heat generation detection target based on the thermoelectromotive force and notifies the facility manager or the like.

  Therefore, according to the abnormality detection device in the distribution board according to the present invention, it can be installed at a low cost, and the temperature of the heat generation detection target can be measured even when the door of the distribution board is closed. An abnormality due to the heat generated in the heat detection target is detected and notified to the facility manager, etc., so it is possible to deal with the abnormality before the fire breaks out, and damage to cables and equipment due to the occurrence of the fire It can be avoided.

  In the present invention, it is preferable that the heat generation detection target includes a charging unit. This is because the charged part is at a high voltage, and is particularly susceptible to heat generation due to electric leakage.

  In the present invention, it is preferable that the heat generation detection target includes an internal wiring. This is because the internal wiring is normally exposed, and heat is likely to be generated due to electric leakage.

  Furthermore, in the present invention, the electromotive force detection means is preferably an ammeter. This is because the generation of a small thermoelectromotive force due to the Seebeck effect can be detected relatively inexpensively.

It is a basic diagram which shows one Embodiment of the abnormality detection apparatus in a distribution board of this invention in the state which opened the door of the side surface of the housing | casing of a distribution board.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram showing an embodiment of an abnormality detection device in a distribution board according to the present invention in a state where a door (not shown) on the side surface of the casing of the distribution board is opened. The casing of the distribution board 2 includes three insulators 3 fixed to the support beam 1a of the casing 1 and 3 is insulated and supported by the insulators 2 and is supported by three insulation-coated cables 4 from the high voltage line. The charging parts where the metal terminals 5 to which the three-phase AC high voltage power is fed are exposed are shown.

  Although not shown in the housing 2, it is further externally connected via a transformer (not shown) that reduces the high voltage of power supplied from the high-voltage line by the three insulation-coated cables 4 to the operating voltage of a normal device, and a distribution terminal. A circuit breaker that automatically or manually shuts off the power distribution circuit when an excessive current flows through the power distribution circuit connected to is arranged between the charging unit 3 and the transformer, and between the transformer and the circuit breaker. An internal wiring such as a bus bar made of an exposed metal rod for connecting between the circuit breaker and the distribution terminal is disposed.

  The power distribution board abnormality detection device of this embodiment installed in such a power distribution board has a housing 1 on the side of the front side of the three insulation-coated cables 4 in the illustrated example within the housing 1 of the power distribution board. A safe separation distance is ensured from the current-carrying parts such as the charging unit 3 and the internal wiring, and for example, copper wire 6 and iron wire 7 as two kinds of metal wires are respectively insulated and coated, and the copper wire 6 One end of the iron wire 7 is exposed by removing the insulation coating, and the exposed one end of the copper wire 6 and the iron wire 7 is used as a heat generation detection target in the housing 1, for example, the charging unit 3. In the vicinity, a safe separation distance is secured from the charging unit 3 and is electrically connected, for example, by soldering or brazing to form a connection unit C.

  Furthermore, the abnormality detection device in the distribution board of this embodiment routes the copper wire 6 and the iron wire 7 to the outside of the housing 1, and connects the other end of the copper wire 6 and the iron wire 7 to the outside of the housing 1. As an electromotive force detecting means, for example, it is configured to be connected to an input terminal of an ammeter 8 as an exposed state after the insulation coating is removed.

Here, the ammeter 8 measures the current flowing through the metal wires based on the thermoelectromotive force due to the Seebeck effect of the two types of metal wires of the copper wire 6 and the iron wire 7 and moves the pointer on the scale plate. The scale plate of the ammeter 8 has a temperature (outside air temperature) that is a normal temperature of an input terminal of the ammeter 8 in which the other end of the copper wire 6 and the iron wire 7 is connected as a reference contact , and copper Since the temperature difference between the wire 6 and the connecting portion C at the one end of the iron wire 7 is measured and displayed in advance by an experiment, the facility manager or the like can obtain the outside temperature displayed by the ammeter 8 and That is, when the temperature of the connection C at the one end of the copper wire 6 and the iron wire 7 located in the vicinity of the charging unit 3 in the housing 1 rises to near the fire occurrence temperature. Can be known without opening the door of the housing 1.

  Therefore, according to the abnormality detection device in the distribution board of this embodiment, it can be installed at low cost because it does not use an expensive device such as a thermoviewer. The temperature can be measured, and the measurement result is used to detect an abnormality caused by heat generation near the charging unit 3 in the distribution board and notify the facility manager, etc., so that it is possible to deal with the abnormality before the occurrence of the fire, It is possible to avoid damage to the insulation-coated cable 4, the transformer, the circuit breaker, and other devices due to the occurrence of a fire.

  Furthermore, according to the abnormality detection device in the distribution board of this embodiment, since the copper wire 6 and the iron wire 7 are used as the two types of metal wires, and an inexpensive ordinary ammeter is used as the electromotive force detection means, these From the point of view, the apparatus can be installed at a low cost.

  Although the present invention has been described based on the illustrated examples, the present invention is not limited to the above-described examples, and can be appropriately changed within the scope of the claims as required. For example, two kinds of metals For example, a K-type thermocouple with a higher thermoelectromotive force can be used as the wire. Also, the above-mentioned internal wiring is included in the heat generation detection target and the junction of two types of metal wires is charged. Instead of or in addition to the vicinity of the portion 3, it may be arranged in the vicinity of the internal wiring.

  And, as an electromotive force detection means, a thermoelectromotive force amplification circuit, or a device having a circuit that outputs an alarm signal by light or sound when a thermoelectromotive force higher than the reference value is detected, etc. It can also be used.

  Thus, according to the abnormality detecting device in the distribution board according to the present invention, it can be installed at low cost, and the temperature of the heat generation detection target can be measured even when the door of the distribution board is closed. Detects abnormalities due to heat generation in the heat detection target and notifies the facility manager, etc., so that it is possible to deal with abnormalities before a fire breaks out and avoids damage to cables and equipment due to the occurrence of a fire. can do.

DESCRIPTION OF SYMBOLS 1 Case 1a Support beam 2 Insulator 3 Charging part 4 Insulation covering cable 5 Metal terminal 6 Copper wire 7 Iron wire 8 Ammeter C Connection part

Claims (4)

In the housing of the power distribution board, secure a safe separation distance from the energized location in the housing and wire two types of metal wires,
One end portions of these two types of metal wires are electrically connected to each other while ensuring a safe separation distance from the heat detection target in the housing,
Route these two types of metal wires out of the housing,
The other end of the two types of metal wires is connected to the electromotive force detection means outside the casing,
Based on the thermoelectromotive force due to the Seebeck effect of the two types of metal wires detected by the electromotive force detection unit using the connection portion between the other end of the two types of metal wires and the electromotive force detection unit as a reference contact. An abnormality detection device in the distribution board that detects and reports an abnormality caused by heat generation of the heat generation detection target.   The abnormality detection device in a distribution board according to claim 1, wherein the heat detection target includes a charging unit.   The abnormality detection device in a distribution board according to claim 1 or 2, wherein the heat generation detection target includes an internal wiring.   The abnormality detection device in a distribution board according to any one of claims 1 to 3, wherein the electromotive force detection means is an ammeter.

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