CN103364110A - Method for comprehensively calibrating high-voltage transformer body and remote temperature measurement used thermometer - Google Patents

Abstract

The invention is a comprehensive verification method for simultaneously verifying a high-voltage transformer body of a power system and a remote temperature measuring instrument with Pt100 and a remote temperature measuring meter. With microcomputer as the main body, it is composed of special software, multi-channel scanning device, electrical measuring instrument, high stability temperature controller, second-class standard platinum resistance thermometer (replacing second-class standard mercury thermometer), constant temperature water tank, constant temperature oil tank, etc., to realize fast Detection, accurate measurement data, saving calibration time, improving efficiency, avoiding human errors, improving measurement accuracy, and reducing the labor intensity of calibration personnel, etc. It can be widely used in the verification of the high-voltage transformer body of the power system and the thermometer used for remote temperature measurement.

Description

Comprehensive Calibration Method of High Voltage Transformer Body and Remote Temperature Measuring Thermometer

technical field

The invention relates to a verification method of a high-voltage transformer body of a power system and a thermometer for remote temperature measurement, in particular a verification method of a temperature measurement device capable of constant temperature and remote transmission.

Background technique

At present, the known high-voltage transformer thermometers in power systems include main transformer body temperature gauges, transformer winding temperature gauges, and remote temperature gauges. Industrial platinum and copper thermal resistors are used as temperature-sensing elements. It changes accordingly, and is transmitted to the main control room through the cable, and then displayed by a digital display. The calibration method is: separate the main transformer body temperature gauge and the platinum resistance and digital display gauge of the remote temperature gauge for calibration. Calibration of a set of main transformer body and remote thermometers takes at least one day and at most several days; the standard used is a second-class standard mercury thermometer. The problem is that it cannot perform remote operation and temperature control, and also produces reading errors.

content of the invention

To overcome the shortcomings of the existing test methods such as repeated heating, inability to control the temperature remotely, remote operation and reading data are prone to reading errors, and design a high-precision, high-voltage transformer body and platinum resistance and remote thermometers at the same time. Comprehensive calibration method of calibration. The comprehensive verification method for the high-voltage transformer body and the thermometer used for remote temperature measurement is:

a. Insert the temperature saturation pt100 of the measured main transformer thermometer into the constant temperature water tank or constant temperature oil tank, and connect the remote temperature measuring meter;

b. Use channel 1 as the standard device measurement channel, and connect the standard thermal resistance;

c. Connect the measured thermal resistance to channel 2 or 3; after the instrument is turned on, the first channel is defaulted, and the ← and → keys can be used to switch between channels, or press the number key and confirm to switch directly to the corresponding channel. There are corresponding channels and standards, inspected 1, inspected 2, cold end, etc. on the display screen;

d. Turn the air switch on the rear panel of the temperature controller to the "on" position;

e. Connect the signal input terminal of the temperature controller to the platinum resistance pt100 built in the constant temperature water tank;

f. Connect the power output terminal of the temperature controller to the hot line of the constant temperature water tank, and the constant temperature water tank must be reliably grounded;

g. The power input end of the temperature controller is drawn from the total power aviation power plug on the rear side of the system cabinet;

h. Press the power switch on the front panel of the constant temperature water tank temperature controller to turn it on;

i. Enter the temperature automatic verification system;

z. At the beginning of the verification, record the values of the transformer body temperature gauge, remote temperature gauge and Pt100 for each verification point. If you want to check whether the contacts at 55°C, 65°C, and 75°C are in good condition, you can wait for the temperature to rise to 40°C Then stop first. After selecting custom temperature control, input 55°C. When the temperature rises to 55°C, use a multimeter to measure whether the contact is connected, and then cancel the custom, and then run normally;

k. Exit after the test is over.

Beneficial effects of the present invention:

When measuring Pt100 with a second-class standard platinum resistance thermometer, it is calibrated together with the temperature gauge of the transformer body and the remote temperature gauge at the same time. The microcomputer is the main body, and it consists of special software, multi-channel scanning device, electrical measuring instrument, high stability temperature controller, The second-class standard platinum resistance thermometer (replacing the second-class standard mercury thermometer), constant temperature water tank, constant temperature oil tank, etc., have realized the advantages of rapid detection and accurate measurement data. Due to the comprehensive calibration method of the main transformer temperature gauge, it can take half a day to calibrate the main transformer body and the Pt100 and digital display meter for remote temperature measurement, which saves time and improves work efficiency; The reading error produced by the standard mercury thermometer improves the accuracy of the measurement and reduces the labor intensity of the testers.

Description of drawings:

Fig. 1 is a schematic diagram of the working process of the present invention.

A preferred embodiment of the present invention: as shown in Figure 1, shown in the figure:

Standard: second-class standard platinum resistance thermometer

Detected: Pt100, transformer body temperature gauge and remote temperature gauge

Electrical measuring instrument: electrical signal measurement, accuracy 0.01%, resolution 0.1Μv, 0.1mΩ

Multi-channel scanning device: the current channel can be set by keyboard operation and displayed on the display. Used together with a digital meter or an electric bridge, it can be used to verify the temperature and humidity fields of thermal resistors, thermocouples and test incubators.

Electrical measuring instrument: electrical signal measurement.

Temperature control device: The constant temperature oil tank and its temperature controller provide a stable temperature field for the verification of the thermal resistance/thermocouple, and the constant temperature water tank and its temperature controller provide a stable temperature field for the verification of the thermal resistance.

Temperature control sensor: second-class standard platinum resistance thermometer pt100, a standard device for testing thermal resistance.

The comprehensive verification method for the high-voltage transformer body and the thermometer used for remote temperature measurement is:

a. Insert the temperature saturation pt100 of the measured main transformer thermometer into the constant temperature water tank or constant temperature oil tank, and connect the remote temperature measuring meter.

b. Use channel 1 as the standard device measurement channel, and connect the standard thermal resistance.

c. Connect the measured thermal resistance to channel 2 or 3...

After the instrument is turned on, it defaults to channel 1. Press the ← and → keys to switch between channels, or press the number key and confirm to switch to the corresponding channel directly. The display screen shows the corresponding channel and standard, tested 1, Checked 2..., cold end and other words.

d. Turn the air switch on the rear panel of the temperature controller to the "on" position.

e. Connect the signal input terminal of the temperature controller to the platinum resistance pt100 built in the constant temperature water tank.

f. Connect the power output terminal of the temperature controller to the hot wire of the constant temperature water tank, and the constant temperature water tank must be reliably grounded.

g. The power input end of the temperature controller is drawn from the total power aviation power plug on the rear side of the system cabinet.

h. Press the power switch on the front panel of the constant temperature water tank temperature controller to turn it on.

i. Enter the temperature automatic verification system.

z. System settings

Scanning includes: ① Measuring table Scanning OK

    ② Inspection instrument Scan OK

③Scan the water tank of the temperature control meter to confirm

Setting: Enter the basic information of the standard device

test

① Select the type of inspection: pt100

②Detected device level: B

③Assessor and reviewer

④ Quantity

Standard: two-wire thermal resistance

Verification point setting Select→Custom For example, measure 0, 20, 40, 60, 80, 100

According to the verification in the verification point

At the beginning of the verification, record the temperature gauge of the transformer body, the remote temperature gauge and the value of Pt100 for each verification point. If you want to check whether the contacts at 55°C, 65°C, and 75°C are in good condition, you can wait for the temperature to rise to 40°C. Stop, after selecting custom temperature control, input 55°C, when the temperature rises to 55°C, use a multimeter to measure whether the contact is unconnected, and then cancel the custom, and then run normally.

k. Exit after the test is over.

The use of constant temperature oil tanks is the same as that of constant temperature water tanks, but their measurement ranges are different.

The temperature range of the constant temperature oil tank measuring and controlling instrument is 100°C--300°C;

The temperature range of the constant temperature water tank measuring and controlling instrument is -10°C--100°C.

When using a constant temperature water tank, if the set value is lower than room temperature, you need to turn on the compressor switch of the water tank for cooling; when the temperature rises, turn off the compressor, and when the temperature in the water tank is higher than 40°C, do not turn on the compressor .

Claims (1)

1. a high voltage transformer body and distant place thermometric is characterized in that with thermometer overall calibration method:

A, with tested main transformer thermometer have enough to eat and wear and pt100 inserts in Water Tank with Temp.-controlled or the thermostatic oil bath, connect distant place temperature measuring gauge;

B, passage 1 is measured passage as standard, the standard thermal resistance is connected;

C, with tested thermal resistance access passage 2 or 3; Acquiescence the 1st passage after the instrument start, connect ← and → key can be at each interchannel cyclic switching, or press numerical key and then confirm namely can be directly switch to corresponding passage, corresponding passage and standard, tested 1, tested 2 are arranged on the display screen ..., the printed words such as cold junction;

D, the air switch on the temperature controller rear panel is got on the position of " opening ";

E, the signal input part of temperature controller is received on the built-in platinum resistance pt100 of Water Tank with Temp.-controlled;

F, the power output end of temperature controller is received on the hot line of Water Tank with Temp.-controlled, Water Tank with Temp.-controlled is wanted reliable ground;

The power input of g, temperature controller is by drawing on system's cabinet rear side total output airplane power source plug;

H, the power switch of pressing on the Water Tank with Temp.-controlled temperature controller front panel are started shooting;

I, enter the temperature automatic verification system;

Z, calibrating beginning, value to each calibrating point record transformer body thermometer, distant place temperature measuring gauge and Pt100, if whether the contact of thinking to have a look in addition 55 ℃, 65 ℃, 75 ℃ is good, but equitemperature stops first after rising to 40 ℃, select self-defined temperature control after, input 55 ℃, after temperature rises to 55 ℃, logical obstructed with multimeter amount contact, then cancel self-defined after, normal operation;

K, calibrating finish backed off after random.

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