JP2000304627A - Method and device for calibration of temperature sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make collectively and quickly confirmable an operation state by bringing the sensing part of a plurality of temperature sensors into contact with the block while the temperature of a block wherein the entire can be kept at a soaking state is monitored with a reference thermometer, and comparing these temperature measurement values with a monitor temperature acquired with the reference thermometer. SOLUTION: The device comprises a constant-temperature block 1, a temperature sensor 2 which is to be calibrated, a calibration temperature sensor 3, a heating vessel 6, a temperature indication adjuster 51, and a calibration temperature indication adjuster 31, etc. With this configuration, the power source cord 41 of a heater 4 fitted to the constant-temperature block 1 is wired to the temperature indication adjuster 31, for power supply to the heater 4. When the constant-temperature block 1 reaches a specified temperature, the calibration temperature indication adjuster 31 reads a temperature measurement value of the calibration temperature sensor 3, and further, the temperature indication adjuster 51 reads a temperature measurement value of each temperature sensor 2. These temperature measurement results are compared with the measurement result with the calibration temperature sensor 3 for checking the operation state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the construction of a connection section for an ultra-high voltage power cable, for example, in which the operating states of a large number of temperature sensors used for temperature control of each section are actually connected to a control panel of these sensors. The present invention relates to a temperature sensor calibration method and a calibration device used for collectively checking whether or not a normal operation is performed in a state where the temperature sensor is operated.

[0002]

BACKGROUND OF THE INVENTION In constructing a connection portion of a rubber / plastic power cable, an insulator (reinforcement insulator) connecting the insulators of both cables to be connected is formed, and then the cable insulator and the reinforcement insulator are integrally molded. There are a tape winding mold connection (TMJ), an extrusion mold connection (EMJ), a block mold connection (BMJ), and the like. In forming these connection portions, a straightening process for removing a bending habit of a cable, a process of molding and integrating a cable insulator and a reinforcing insulator, and a process of extruding a molten insulator in EMJ, There are various processes that require severe temperature control.

For example, in the case where a cable insulator and a reinforcing insulator are integrated by heating in a mold-type connecting portion of a CV cable, a crosslinking agent such as dicumyl peroxide (DCP) or the like is used to cause chemical crosslinking. Crosslinking is performed using While this DCP decomposes upon heating to promote the cross-linking reaction, it has the effect of generating methane gas with the reaction, and when the gas agglomerates inside the polyethylene, it forms voids and lowers the performance of the insulator. Sometimes. Therefore, in order to avoid the gas agglomeration phenomenon, it is necessary to perform heating and pressurization by heating and applying an appropriate pressure under strict temperature control.

In the above heating and pressurization, it is ideal to manufacture while monitoring the internal state of the insulator. However, since it is not possible to embed the temperature and pressure sensors directly inside the insulator, it is necessary to meet external conditions. And rely on so-called process management to determine product performance. In other words, only products manufactured under the conditions necessary for manufacturing are determined to have the desired performance, so that it is required to strictly observe the manufacturing conditions. In order to satisfy such conditions, the manufacturing equipment must always exhibit a predetermined capacity, and maintenance and inspection are indispensable. The same applies to the above-described cable directing step, insulator extruding step, and the like.

[0005] However, the connection work of the ultra-high-voltage power cable is performed in a manhole or a cave provided in the underground, and each cable must be connected one by one. The equipment required for manufacturing will be repeatedly assembled, dismantled, and moved. In particular, among these equipment, it must be said that various heating operations involving wiring involve a large number of steps of attaching and detaching electric wires, and include steps that easily cause poor contact and the like. In the heating work,
Particularly, in the heating and pressurizing crosslinking step, the temperature factor is very important to strictly observe the production conditions, and it is required to confirm whether a predetermined temperature state is maintained in each part. In other words, it is important to check in advance whether the temperature sensor used for measuring the temperature of each part has caused an operation failure due to the above-described factors. Moreover, in view of the disassembly and reassembly, there is a demand for a method that can easily and quickly confirm the operation of all the temperature sensors used in consideration of workability.

A thermocouple commonly used as the above-mentioned temperature sensor is a thermocouple, and several to a dozen or so thermocouples are used in the heating and pressurizing crosslinking step and the extrusion step. Conventionally, as a simple method of temperature calibration of these thermocouples, a thermocouple is immersed in boiling water at a time, and the temperature of the boiling water is measured using a mercury thermometer that can accurately and easily handle the temperature as a standard thermometer. Has been generally performed by comparing the measurement result with the temperature measurement result by each thermocouple.

[0007] However, the connection site of the ultra-high voltage power cable is a manhole or a canal, which is basically a place where it is difficult to prepare materials and equipment. In addition, when boiling water is used, water is put into a container. Equipment for transport and heating is required. Further, there is a problem that handling a liquid such as water is very inconvenient at a connection site, and disposal of water is troublesome.

Accordingly, the present invention provides a method for calibrating a temperature sensor that can promptly confirm the operating states of a large number of temperature sensors at a time at an actual measurement site, and also facilitates transportation and handling to the site. An object of the present invention is to provide a calibration device that is excellent in quality.

[0009]

The temperature sensor calibration method of the present invention is a calibration method for collectively confirming the operation states of these temperature sensors in a state where a plurality of temperature sensors are connected to a control panel. While monitoring the temperature of a block that can be maintained in a uniform temperature state with a reference thermometer, the sensing units of the plurality of temperature sensors are brought into contact with the block, and the temperature measured by these temperature sensors and the reference temperature are compared. It is characterized by comparing with a monitor temperature measured by a meter.

Further, the temperature sensor calibration device of the present invention comprises:
A constant-temperature block having a large number of storage holes capable of storing the sensing unit of the temperature sensor, a heater capable of heating the constant-temperature block to a uniformly heated state, and a sensing unit stored in one of the storage holes A temperature sensor for calibration and a display device thereof are provided.

[0011]

According to the first aspect of the present invention, a block in which the whole body can be maintained in a uniform temperature state is used, and a plurality of temperature sensors are connected to the control panel. In a state immediately before the sensors are arranged at the predetermined portion, it is possible to quickly and quickly calibrate a large number of sensors. Therefore, for example, in a heat molding operation of a power cable connection portion, the operation state of the temperature sensor immediately before being attached to the heating and pressurizing container or the like can be efficiently grasped, so that the operation time can be reduced. Moreover, since the block is used, the handling and transportability are remarkably excellent as compared with the case where boiling water is used, and the workability is excellent even when the working environment is in a manhole or a cave.

According to the second aspect of the present invention, a storage hole is provided in the constant temperature block, and a temperature sensor to be calibrated and a reference calibration temperature sensor are inserted into the storage hole. At this time, the sensor can be easily attached.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view for explaining a method for calibrating a temperature sensor according to the present invention. FIG. 1 shows a state in which temperature calibration according to the present invention is being performed. In the figure, 1 is a constant temperature block that can be maintained in a uniform temperature state,
Reference numeral 2 denotes a temperature sensor to be calibrated. The sensing portion of each temperature sensor 2 is inserted into the temperature sensor storage hole 11 of the constant temperature block 1, and the other end is connected to the temperature control panel 5. Reference numeral 3 denotes a calibration temperature sensor serving as a reference thermometer. Similarly, a sensing unit is inserted into a storage hole 12 of the calibration temperature sensor provided in the constant temperature block 1.

As the temperature sensor 2 to be calibrated and the temperature sensor 3 for calibration, any material that can convert temperature into an electric signal, such as a thermocouple, a resistance thermometer, or a semiconductor thermometer, may be used. Since the calibration temperature sensor 3 is used as a reference thermometer, it is desirable to use a high-precision sensor that has been verified. The temperature sensor 2 and the calibration temperature sensor 3
It is necessary to attach a mechanism for converting an electric signal to a temperature. Therefore, the temperature sensor 2 is provided to the temperature indicating controller 51 incorporated in the temperature control panel 5, and the calibration temperature sensor 3 is provided for the calibration temperature indicating. The non-sensing end is connected to the controller 31. Each of the indicating controllers 51 and 31 is provided with a temperature compensating device and a converting device (not shown), and a display, such as a dial, for directly displaying the measured temperature.

The constant temperature block 1 (shown in an enlarged perspective view in FIG. 2) supports the temperature sensor 2 to be calibrated and the temperature sensor 3 for calibration, and also serves to supply a thermal signal to these sensors. The thermostatic block 1 is made of a material having good thermal conductivity such as copper, aluminum, and SUS, and is manufactured so that heat is uniformly transmitted to the whole and the temperature of each part is constant. Alternatively, one formed so that the temperature of at least the storage holes 11 and 12 of the temperature sensor can be kept uniform. In this embodiment, the shape is exemplified by a cylindrical shape, but the shape is not limited to this, and can be appropriately determined in consideration of the manner of heat transmission.

As shown in FIG. 2, the thermostatic block 1
A heater 4 for supplying heat is attached. The heater 4 is generally provided on the outer periphery of the constant temperature block 1, and in a state where the temperature sensor 2 and the calibration temperature sensor 3 are installed on the constant temperature block 1, a temperature set for temperature measurement is given and supplied. Those having a calorific value sufficient to maintain are used. Reference numeral 41 denotes a heater power cord. In this embodiment, the other end is connected to the calibration temperature indicating controller 31 so that the controller 31 can set the amount of heat generated.

Reference numeral 6 denotes a heating vessel which requires temperature control. When the present invention is applied to the construction of a connection portion of an ultra-high voltage power cable, a mold device for heating mold or the like corresponds to the heating vessel. . The heating vessel 6 is connected to a heating vessel power cord 61, and the other end of the cord 61 is connected to the temperature control panel 5. Note that points a to f in the figure indicate mounting points of the sensing part of the temperature sensor 2, and FIG. 3 shows a state where the temperature sensors are assembled to these points a to f.

Hereinafter, the temperature sensor calibration method of the present invention will be described.
The procedure of a case applied to a heating molding operation or the like of an ultra-high voltage power cable connection portion will be described. After conducting the conductor connection of the power cable to be connected, forming the reinforcing insulator, and performing necessary processing, a mold apparatus (heating container 6) for heating and pressure crosslinking is assembled on the connection portion. On the other hand, in order to manage the temperature of the heating container 6, for example, a programmed temperature control panel 5 to which a heating pattern in which a programmed heating temperature and time are designated is input is prepared. And the control panel 5
A power cord 61 for supplying electric power to the heater of the heating container is wired between the heating container 6 and the heating container 6.

Here, in order to provide information for adjusting the power supplied to the heater, a plurality of temperature sensors 2 are installed at predetermined points a to f of the heating vessel 6. In this step, the present invention is applied. The calibration method of the temperature sensor is applied. Generally, the normal operation check of the temperature control panel 5 and
Although it is confirmed in advance by a tester or the like that there is no trouble such as disconnection of each temperature sensor 2, it is important for process management to confirm whether these devices can operate normally as a system. Therefore, after assembling the entire apparatus for the heating mold, the sensing part of each temperature sensor 2 is inserted into the temperature sensor housing hole 11 of the constant temperature block 1 while being attached to the temperature control panel 5. Similarly, the sensing part of the calibration temperature sensor 3 connected to the temperature indicating controller 31 is inserted into the storage hole 12 of the constant temperature block 1 to prepare for the calibration work.

The power cord 41 of the constant temperature block heating heater 4 attached to the constant temperature block 1
Is wired to the temperature indicating controller 31 and the heater 4 is energized. The constant-temperature block 1 is heated for a predetermined time, and when the temperature of the constant-temperature block 1 is increased to an intended temperature and a state where the temperature is estimated to be stable is reached, the temperature is measured by the calibration temperature sensor 3 by the calibration temperature indicating controller 31. Read the value. Further, the temperature indicating controller 51 reads the temperature measured value by each temperature sensor 2.

By comparing these temperature measurement results, if the measured values of any of the temperature sensors 2 are substantially the same as the measurement results of the calibration temperature sensor 3, it can be confirmed that each temperature sensor is operating normally. If the measured value of any one of the temperature sensors 2 indicates a value that is far apart, it indicates that the sensor is malfunctioning, and the wiring state is checked and the sensor is replaced.

When the normal operation of each temperature sensor 2 has been confirmed, as shown in FIG.
To f, the sensing unit of the temperature sensor 2 is attached. Thereafter, the heating container 6 is operated, that is, the heating and pressurizing cross-linking step is started, and the heating molding operation of the power cable connection portion and the like are performed while monitoring the temperatures at the respective temperature measurement points a to f.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a method for calibrating a temperature sensor according to the present invention.

FIG. 2 is a perspective view showing a temperature sensor calibration device of the present invention.

FIG. 3 is a perspective view showing a temperature measurement state by a temperature sensor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Constant-temperature block 11 Temperature sensor accommodation hole 12 Temperature sensor accommodation hole for calibration 2 Temperature sensor 3 Temperature sensor for calibration 4 Heater 5 Temperature control panel 6 Heating vessel

Claims (2)

[Claims] 1. A calibration method for collectively confirming an operation state of a plurality of temperature sensors in a state where a plurality of temperature sensors are connected to a control panel. While monitoring the temperature with a reference thermometer, the sensing units of the plurality of temperature sensors are brought into contact with the block, and the temperature measured by these temperature sensors is compared with the monitor temperature by the reference thermometer. Method of calibrating temperature sensors. 2. A constant temperature block having a large number of storage holes capable of storing a sensing portion of a temperature sensor, a heater capable of heating the constant temperature block to a uniformly heated state, and sensing in one of the storage holes. A calibration device for a temperature sensor, comprising: a calibration temperature sensor in which a unit is housed; and a display device.