The three-phase electric energy meter field calibrator is a special instrument used by electric power personnel to verify the electric energy meter in the field, and is one of the more important detection equipments in the electric power system. In the process of using this instrument, we will encounter some common fault problems. Knowing these problems and solutions will ensure the smooth running of the test.
Problem 1: The calibrator has no calibration error. Cause 1: The photoelectric head is not good, or the pulse line is not clamped, and the pulse output terminal of the electronic watch is not clamped. Solution: Re-light, confirm the black mark of the mechanical table. When the switch is turned over, the pulse indicator of the photo head flashes and only blinks once. Re-clamp the pulse output terminal of the electronic watch, such as whether the output end of the terminal or the ground wire is clamped, or whether the reactive pulse output port is clamped.
Reason 2: The actual power at the site is very low, and the meter takes a long time to send a pulse signal. Look at the total active power of the calibrator.
Solution: If the current in the field is too small, you need to wait.
Problem 2: The field calibration meter error is too poor or the transition is too large: when the meter is calibrated on the spot, the error of the calibration display is about 3%, and the error is unstable. The difference between the latest error and the last error is 2 %the above.
Reason 1: The actual current at the site is too small. Below 0.1A, the current is no longer within the accuracy guaranteed by the national standard. At this point, the error displayed by the calibrator has no practical significance.
Cause 2: The field harmonics are too large. When the on-site harmonic is too large (10%-60% or even more), the measuring instrument is no longer within the guaranteed accuracy range specified by the national standard. At this time, the error displayed by the calibrator has no practical significance. Especially in the place where the harmonics are too large, the error can be up to 200%.
Cause 3: The field current changes too much. When the site has a high-power impact load, the current fluctuation is too large, which affects the energy metering of the measuring instrument. At this point, the error displayed by the calibrator has no practical significance.
Reason 4: The field power factor is too low, often as low as 0.3C or 0.3L (common in small power station sites). The energy meter under such a low power factor is generally not normally metered. At this time, the error displayed by the calibrator is not practical. Solution: If the power factor is 0.3C, please remove the power compensation from the reactive power compensation. If it is 0.3L, please input reactive power compensation to increase the power factor.
Question 3: The field instrument only displays the voltage and no current display phenomenon: after the current and voltage lines are connected, the instrument only displays the voltage, no current is displayed. Cause: The calibrator uses the 5A clamp to take the current, but in the input mode of the test parameters. Set the 5A terminal solution: Press the 9 key to enter the test parameter dialog box (the "test parameter "9" turns yellow). Press the up or down arrow keys to move the cursor to “Input†and press the left and right arrow keys to make the input “5A Pliersâ€. Press OK to exit (the "test parameter "9"" turns black). If the current is taken from the current terminal, the instrument is set to "5A pliers" input and there is no current display.
Question 4: The error of the calibration meter is as large as 100%. When the meter is calibrated on site, the error of the calibration display is above 100%.
Cause 1: The calibration parameter setting is incorrect. If the 5A clamp and 5A terminal input mode are used, the ratio setting is not 001; when the active energy is verified, the mode is set to reactive or manual active; the meter constant setting is incorrect.
Solution: Please re-check the parameter settings.
Cause 2: When using the 5A terminal input method, the current line is on the current line of the meter. At this point, the calibrator acts as a shunt to the current of the meter, and the current flowing through the calibrator and the meter is not equal to the current and forms a large error.
Judgment method: The current displayed by the calibrator is different from the current displayed by the meter.
Solution: Be sure to remove the current line of the meter first, and then check the current line of the calibrator.
Note: At the scene, you must first short-circuit the current and then remove the current line of the meter to avoid accidents due to the open circuit of the current transformer.
Cause 3: When using the 5A clamp input mode, the current line of the meter is too thick or the current line is too crowded, so that the jaws of the clamp cannot be tightly closed. The current detected by the calibrator is too small to form a large error.
Judgment method: The current displayed by the calibrator is not the same as the current displayed by the meter, and is smaller than the current displayed by the meter.
Solution: Close the jaws of the clamp.
The common faults and solutions of the three-phase electric energy meter field calibrator are necessary for the electric power personnel to understand, which is very useful for their practical operation.
Problem 1: The calibrator has no calibration error. Cause 1: The photoelectric head is not good, or the pulse line is not clamped, and the pulse output terminal of the electronic watch is not clamped. Solution: Re-light, confirm the black mark of the mechanical table. When the switch is turned over, the pulse indicator of the photo head flashes and only blinks once. Re-clamp the pulse output terminal of the electronic watch, such as whether the output end of the terminal or the ground wire is clamped, or whether the reactive pulse output port is clamped.
Reason 2: The actual power at the site is very low, and the meter takes a long time to send a pulse signal. Look at the total active power of the calibrator.
Solution: If the current in the field is too small, you need to wait.
Problem 2: The field calibration meter error is too poor or the transition is too large: when the meter is calibrated on the spot, the error of the calibration display is about 3%, and the error is unstable. The difference between the latest error and the last error is 2 %the above.
Reason 1: The actual current at the site is too small. Below 0.1A, the current is no longer within the accuracy guaranteed by the national standard. At this point, the error displayed by the calibrator has no practical significance.
Cause 2: The field harmonics are too large. When the on-site harmonic is too large (10%-60% or even more), the measuring instrument is no longer within the guaranteed accuracy range specified by the national standard. At this time, the error displayed by the calibrator has no practical significance. Especially in the place where the harmonics are too large, the error can be up to 200%.
Cause 3: The field current changes too much. When the site has a high-power impact load, the current fluctuation is too large, which affects the energy metering of the measuring instrument. At this point, the error displayed by the calibrator has no practical significance.
Reason 4: The field power factor is too low, often as low as 0.3C or 0.3L (common in small power station sites). The energy meter under such a low power factor is generally not normally metered. At this time, the error displayed by the calibrator is not practical. Solution: If the power factor is 0.3C, please remove the power compensation from the reactive power compensation. If it is 0.3L, please input reactive power compensation to increase the power factor.
Question 3: The field instrument only displays the voltage and no current display phenomenon: after the current and voltage lines are connected, the instrument only displays the voltage, no current is displayed. Cause: The calibrator uses the 5A clamp to take the current, but in the input mode of the test parameters. Set the 5A terminal solution: Press the 9 key to enter the test parameter dialog box (the "test parameter "9" turns yellow). Press the up or down arrow keys to move the cursor to “Input†and press the left and right arrow keys to make the input “5A Pliersâ€. Press OK to exit (the "test parameter "9"" turns black). If the current is taken from the current terminal, the instrument is set to "5A pliers" input and there is no current display.
Question 4: The error of the calibration meter is as large as 100%. When the meter is calibrated on site, the error of the calibration display is above 100%.
Cause 1: The calibration parameter setting is incorrect. If the 5A clamp and 5A terminal input mode are used, the ratio setting is not 001; when the active energy is verified, the mode is set to reactive or manual active; the meter constant setting is incorrect.
Solution: Please re-check the parameter settings.
Cause 2: When using the 5A terminal input method, the current line is on the current line of the meter. At this point, the calibrator acts as a shunt to the current of the meter, and the current flowing through the calibrator and the meter is not equal to the current and forms a large error.
Judgment method: The current displayed by the calibrator is different from the current displayed by the meter.
Solution: Be sure to remove the current line of the meter first, and then check the current line of the calibrator.
Note: At the scene, you must first short-circuit the current and then remove the current line of the meter to avoid accidents due to the open circuit of the current transformer.
Cause 3: When using the 5A clamp input mode, the current line of the meter is too thick or the current line is too crowded, so that the jaws of the clamp cannot be tightly closed. The current detected by the calibrator is too small to form a large error.
Judgment method: The current displayed by the calibrator is not the same as the current displayed by the meter, and is smaller than the current displayed by the meter.
Solution: Close the jaws of the clamp.
The common faults and solutions of the three-phase electric energy meter field calibrator are necessary for the electric power personnel to understand, which is very useful for their practical operation.
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