JPH1114292A - Method and apparatus for monitoring clogging of air-cooled heat exchanger for stationary induction electric equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate monitoring of clogging of a cooling tube by monitoring clogging of the tube according to change of pressure loss. SOLUTION: Wind supplied from a blower 10 is exhausted outdoor from an exhaust duct 13 through a cooling tube 5. And, when dust is adhered to the tube 5, an opening area of the tube 5 is gradually reduced by the dust. And, the wind scarcely passes and simultaneously pressure rises between the blower 10 and the tube 5. When a differential pressure of the pressure of the wind is measured by a differential pressure gage 4 at front and rear sides of the tube 5, wind volume passing the tube 5 can be known and simultaneously clogging state of the tube can be also known. Thus, a differential pressure of the wind at front and rear sides of the tube 5 can be simply measured in a short time. And, the wind volume can be known from the differential pressure measured result. Hence, the clogging of the tube 5 can be easily monitored.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for monitoring clogging of a cooling pipe of a wind-cooled heat exchanger for a stationary induction device such as a transformer or a reactor.

[0002]

2. Description of the Related Art An air-cooled heat exchanger is constructed as shown in FIG. 4 and is installed indoors. To the cooling pipe 5. As shown in FIG. 5, the cooling pipe 5 is composed of an oil guide tube 8 and heat radiating fins 9, and the insulating oil flows through the oil guide tube 8 to forcibly ventilate the heat radiating fin 9 with a blower 10 to cool the insulating oil. As a method of diagnosing clogging of the cooling pipe 5, generally, the air flow is measured at the intake port of the blower 10, and when the air flow is lower than the rated air flow or the air flow control value of the heat exchanger, the cooling pipe 5 is clogged. Therefore, the cooling pipe 5 is washed to remove the attached dust.

[0003]

As described above, as a method for diagnosing clogging due to dust adhering to the cooling pipe 5 of the air-cooled heat exchanger, the air volume is measured at the intake port of the blower 10, but the measuring method is as follows. The wind speed of the wind passing through the inlet 12 is measured by a thermocouple-type anemometer or the like, and is obtained by multiplying the cross-sectional area of the inlet. However, in actual airflow measurement, in order to reduce the measurement error, the wind speed measurement points 11 are generally measured at 16 or more points as shown in FIG. 6 to calculate the arithmetic average wind speed. Is determined, the wind speed is measured in each measurement, the average wind speed is calculated, the dimensions of the intake port 12 are measured, and the air volume calculation procedure is required.

Accordingly, an object of the present invention is to pay attention to the fact that the cooling pipe 5 of the air-cooled heat exchanger is clogged with dust and the pressure loss against ventilation increases, and the change in pressure loss causes the cooling pipe 5 It is an object of the present invention to provide a method and an apparatus for monitoring clogging.

[0005]

The present invention utilizes the fact that the cooling pipe 5 of an air-cooled heat exchanger is clogged with dust and increases the pressure loss with respect to ventilation.
The air blown out from the blower 10 passes through the cooling pipe portion and is exhausted from the exhaust duct 13 to the outside. However, when dust adheres to the cooling pipe 5, the cooling pipe portion is exposed to dust. At the same time as the opening area of the cooling fan 5 becomes smaller and the wind becomes harder to pass. At the same time, the pressure between the blower 10 and the cooling pipe 5 increases. At this time, the relationship between the pressure between the blower 10 and the cooling pipe 5 and the amount of air passing through the cooling pipe portion changes along the "pressure-air flow" characteristic curve of the blower 10 shown in FIG. If the air volume is Q1 and the pressure is P1 when there is no dust adhesion, the air volume changes to Q2 and the pressure P2 when the cooling pipe 5 is clogged with the dust. Therefore, the wind pressure (P
By measuring the differential pressure P3 of 2-P1), it is possible to know the amount of air passing through the cooling pipe portion by referring to the curve shown in FIG. 3 and at the same time to know the clogging state of the cooling pipe.

In the monitoring of clogging of the cooling pipe by measuring the differential pressure across the cooling pipe section according to the present invention, the air volume and the clogging state of the cooling pipe can be known only by measuring the differential pressure.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method and an apparatus for monitoring clogging of a wind-cooled heat exchanger for a stationary induction electric machine according to the present invention will be described with reference to the drawings. FIG. 1 is a structural view of one embodiment of the present invention, and FIG. 2 shows a differential pressure gauge connection port used for measuring a differential pressure. The differential pressure gauge connection port 1 shown in FIG. 2 is provided in the wind tunnel 2 and the exhaust wind tunnel 3 before and after the cooling pipe section, and the differential pressure gauge 4 is connected to the differential pressure gauge connection port 1 to easily reduce the differential pressure of the wind with respect to the ventilation of the cooling pipe section. It can be measured in a short time.

[0008] The air volume conversion for the measurement results is carried out as an initial value when the air-cooled heat exchanger is installed, or in the case of an existing product, the air volume after cleaning the cooling pipe 5 and the differential pressure of the cooling pipe section are measured. The data is assumed to be the air volume Q1 and the pressure P1 of the "pressure-air volume" characteristic curve of the blower shown in FIG. Assuming that the differential pressure measurement result when the cooling pipe is clogged is P3, P1 + P3 = P2, and the air volume at the pressure P2 can be easily read from FIG. 3, and the minimum air volume control value of the air-cooled heat exchanger is determined. If this is done, the maximum value of the differential pressure P3 is determined, and can be used as the clogging limit management value of the cooling pipe.

[0009]

As described above, according to the present invention, the differential pressure of the wind before and after the cooling pipe section can be easily measured in a short time, and the flow rate can be known from the differential pressure measurement result. Monitoring can be performed easily.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a structural view showing one embodiment of the air-cooled heat exchanger differential pressure measurement of the present invention, wherein (A) is a front view and (B) is a side view.

FIG. 2 is a sectional view showing an example of a differential pressure gauge mounting port of the present invention.

FIG. 3 is an example of a “pressure-air flow” characteristic curve of the blower.

FIG. 4 is an external view showing an example of an air-cooled heat exchanger;
(A) is a front view and (B) is a side view.

5A and 5B are views showing an example of a cooling pipe, wherein FIG. 5A is a front view and FIG. 5B is a side view.

FIG. 6 is a diagram illustrating an example of a wind speed measurement point at a blower inlet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Differential pressure gauge connection port 2 Wind tunnel 3 Exhaust wind tunnel 4 Differential pressure gauge 5 Cooling pipe 6 Equipment connection pipe 7 Heat exchange part 8 Oil guide pipe 9 Radiation fin 10 Blower 11 Wind speed measurement point 12 Inlet 13 Exhaust duct

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Ogawa 1-50 Kanda Jimbocho, Chiyoda-ku, Tokyo Takada Manufacturing Co., Ltd. (72) Inventor Kazuki Iizuka 1-1-3 Uchisaiwai-cho, Chiyoda-ku, Tokyo Inside Tokyo Electric Power Company (72) Inventor Masayuki Kamada 1-1-1 Jinnan, Shibuya-ku, Tokyo TEPCO Tokyo Minami Branch (72) Inventor Toshifumi Gamo 1-10-1 Jinnan, Shibuya-ku, Tokyo Tokyo Electric Power Company Tokyo Minami Branch (72) Inventor Takao Hirai 5-4-2 Shinjuku, Shinjuku-ku, Tokyo Tokyo Electric Power Company, Tokyo West Branch (72) Inventor Tatsumi Takizawa 2-4-2 Shiba Park, Minato-ku, Tokyo Tokyo Electric Power Company Inside the Ginza Branch (72) Inventor Hideo Ikue 5-31-11 Higashiogu, Arakawa-ku, Tokyo Tokyo Electric Power Co., Inc.Tokyo East Branch (72) Inventor Fukuharu Nakamura 840 Izui, Oyama, Tochigi Pref.

Claims (1)

[Claims] An increase in the pressure loss of wind in a cooling pipe caused by clogging of a cooling pipe of a wind-cooled heat exchanger for a stationary induction electric device is measured by a differential pressure gauge before and after the cooling pipe. Monitoring the clogging state of the cooling pipe part by the change and monitoring the clogging of the air-cooled heat exchanger for stationary induction electric appliances characterized by comprising a differential pressure gauge connection port provided before and after the cooling pipe part and a differential pressure gauge Method and apparatus.