JP3601095B2 - Salt damage prediction maintenance equipment for switchboards - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a salt damage prediction and maintenance device for a switchboard installed in a coastal area (salt damage area).
[0002]
[Prior art]
As a countermeasure against salt damage to general outdoor panels, measures are taken against the corrosion of the jacket by the type and thickness of the paint, but no measures have been taken against the electrical surface due to salt damage inside. It is.
[0003]
[Problems to be solved by the invention]
As described above, since no salt damage countermeasures have been taken against the inside of the switchboard, the degree of salt damage inside the switchboard can be determined only when the following problem occurs.
[0004]
(1) Partial discharge due to insulation deterioration (2) Corrosion of conductive part plating of main circuit equipment, etc. (3) Poor contact at contacts of control parts, etc. (4) Rust on inner metal plate.
[0005]
The present invention has been made in view of the above points, and an object of the present invention is to provide a predictive maintenance device for a switchboard capable of issuing a warning and performing predictive maintenance such as maintenance before the above-described problem occurs in the switchboard. It is in.
[0006]
[Means for Solving the Problems]
The present invention
(1) An electric rotary drum for collecting salt , which is provided in a switchboard and has a predetermined collecting area, and a measurement in which the salt attached to the electric rotary drum for holding salt is adhered to the electric rotary drum for collecting salt. Water, and a conductivity meter for measuring the conductivity of the measurement water, wherein when the measured value of the conductivity meter is equal to or more than a set value, it is considered that the amount of salt attached has increased, and an alarm is issued. ,
(2) The set value is a conductivity obtained from a salt content calibration curve representing a relationship between the salt content and the specific resistance when the salt adhesion density in the measurement water is 0.1 mg / cm ^2. Characterized by
(3) The salinity collection area is 100 cm ² , and the amount of measured water is 100 cc .
[0007]
[Action]
By measuring the conductivity in the measurement water from which the salt was collected, the amount of salt attached can be known. The inside of the switchboard was contaminated by salt, and the conductivity measured by the conductivity meter was equal to or higher than the conductivity when the inside of the switchboard had to be cleaned, for example, the salt deposition density was 0.1 mg / cm ² . If so, an alarm is issued. For this reason, it is possible to prevent the occurrence of problems due to salt damage inside the switchboard. Predictive maintenance of the maintenance time is performed.
[0008]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the present invention, a device for measuring the amount of salt attached to a unit area is provided in the panel to determine how much the inside of the panel is contaminated by salt before a problem due to salt damage occurs, and a certain set value (internal cleaning must be performed). When the amount of salt reaches the required level, a warning is output and maintenance is performed.
[0009]
Conventionally, the method shown in FIG. 2 has been used for measuring the amount of salt attached. That is, in First Step S _1, put distilled water 100cc beaker, wipe well the surface of the measuring article with the water in the gauze, rinse well gauze with a contaminant in a beaker.
[0010]
In step _{S 2,} conductivity meter the conductivity of the fouling liquid (manufacturer, YEW format SC82) is measured using a.
[0011]
In step _{S 3,} to calculate the resistivity at Ω · cm = 1 / (S · cm) expression.
[0012]
In step _{S 4,} the salt content calibration curve to determine NaCl content of (mg / 100cc).
[0013]
In step _{S 5,} obtains salt deposition amount per unit area (cm ²⁾ to (mg) by the following equation.
Y = A / S
Here, Y: salt adhesion density of the measured product (mg / cm ² )
A: NaCl content (mg / 100cc)
S: Stained area (cm ² ) of the measured product.
[0014]
According to the measurement method of FIG. 2 described above, if the measured value of the conductivity is known, the amount of salt attached is also known. For this reason, in the present invention, a salt deposition amount measuring apparatus as shown in FIG. 1 is configured by using this measuring method, and the measured conductivity value becomes equal to or higher than a predetermined value (the salt deposition amount increases, that is, insulation deterioration). Then, an alarm was issued to perform maintenance such as maintenance.
[0015]
In FIG. 1, 1 is a switchboard, 2 is a vent, and 3 is a filter. The distribution board 1 is provided with a salt deposition amount measuring device 4. The apparatus 4 for measuring the amount of attached salt includes an electric rotary drum 5 and a brush 6 for collecting salt, measurement water 7 into which salt attached to the drum 5 is immersed, and a sensor 8 for detecting conductivity. And a conductivity meter 9. Outside air enters the switchboard 1 through the vent 2 and the filter 3.
[0016]
In the device configured as described above, the conditions of the device are set as follows in order to set the conductivity at which an alarm is issued.
Condition 1: The alarm threshold for the amount of attached salt is set to 0.1 mg / cm ² .
Condition 2: The water used for collecting the salt is set to 100 cc, and the amount of water is kept constant.
Condition 3: The salinity sampling area is 100 cm ² .
[0017]
The conductivity is calculated backward under the above conditions. First, the total salt content (from A = Y · S) at a salt adhesion density of 0.1 mg / cm ² is 0.1 mg / cm ² × 100 cm ² = 10 mg / 100 cc, and the resistance at the 10 mg / 100 cc The rate is found to be 4.8 × 10 ³ (Ω · cm) from the salt content calibration curve shown in FIG. Therefore, the conductivity becomes 1 / (4.8 × 10 ⁵ ) = 2.08 × 10 ⁻⁴ (S · cm) from S · cm = 1 / Ω · cm.
[0018]
Therefore, in the apparatus of this embodiment, when the conductivity at the salt adhesion density of 0.1 mg / cm ² , that is, 2.08 × 10 ⁻⁴ (S · cm) or more, the conductivity meter 9 issues an alarm. Can be
[0019]
The apparatus for measuring the amount of attached salt 4 is not limited to the apparatus shown in FIG. The above conditions 1 to 3 may be set to other conditions as long as the operation and effect of the present invention are not impaired.
[0020]
【The invention's effect】
ADVANTAGE OF THE INVENTION As mentioned above, according to this invention, it is provided in a switchboard, and the electric rotary drum for salt collection which has a predetermined collection area, and it is hold | maintained at a fixed amount and adheres to the electric rotary drum for salt collection. Measurement water in which the salt is immersed, and a conductivity meter for measuring the conductivity of the measurement water, when the measured value of the conductivity meter is equal to or more than a set value, it is considered that the amount of salt attached has increased. Since the warning is issued, the following excellent effects can be obtained.
[0021]
(1) The occurrence of problems due to salt damage inside the switchboard can be prevented beforehand, and predictive maintenance such as maintenance time can be performed.
[0022]
(2) Due to the above (1), partial discharge due to insulation deterioration, corrosion of conductive portion plating of main circuit devices, etc., poor contact of contacts of control components and the like, and rust of an internal sheet metal do not occur.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an apparatus according to an embodiment of the present invention.
FIG. 2 is a flowchart showing an example of a conventional method for measuring the amount of deposited salt used in an embodiment of the present invention.
FIG. 3 is a salt content calibration curve showing the relationship between the NaCl content and the aqueous solution specific resistance.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Switchboard 2 ... Vent 3 ... Filter 4 ... Salt amount measuring device 5 ... Electric rotary drum 6 ... Brush 7 ... Water 8 ... Sensor 9 ... Conductivity meter

Claims (3)

Provided in the switchboard , an electric rotary drum for salt extraction having a predetermined sampling area, and a measuring water that is held at a fixed amount and is immersed in the salt attached to the electric rotary drum for salt extraction , A conductivity meter for measuring the conductivity of the measurement water, and when the measured value of the conductivity meter is equal to or more than a set value, it is considered that the amount of salt attached is increased and an alarm is issued, characterized in that Salt damage prediction maintenance device. The set value is a conductivity obtained from a salt content calibration curve representing the relationship between the salt content and the specific resistance when the salt adhesion density in the measurement water is 0.1 mg / cm ² , The salt damage prediction and maintenance device for a switchboard according to claim 1. ^{3. The apparatus according} to claim 1, wherein the salt collecting area is 100 cm ² , and the amount of measured water is 100 cc.

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