A tower grounding resistance detection method based on clamp-on transformer

Abstract

The present invention provides a tower grounding resistance detection method based on a clamp-on transformer, comprising the following steps: (1): a control signal generator generates a sinusoidal alternating current signal; (2): a current / voltage conversion module converts the sinusoidal alternating current signal into a sinusoidal alternating voltage signal output; (3): a signal conditioning module adjusts the voltage value of the sinusoidal alternating voltage signal; (4): a voltage sensor is driven by the sinusoidal alternating voltage signal; (5): a current sensor is controlled to collect the current signal generated by the tower down conductor; (6): high-frequency interference signals are filtered out; (7): an effective value of the current signal is extracted; (8): a tower grounding resistance value is calculated; (9): it is determined whether the grounding resistance value is greater than an alarm value, and if so, an alarm is issued, and a display screen displays that the grounding resistance is high. The present invention provides a tower grounding resistance detection method based on a clamp-on transformer, which can improve the detection speed and accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power detection, and in particular relates to a tower grounding resistance detection method based on a clamp-on transformer. Background Art

[0002] In recent years, in terms of the safe operation of transmission lines, lightning tripping faults have become an important factor affecting the safe and stable operation of transmission lines. Installing grounding devices such as overhead lightning arresters, grounding down conductors, and grounding bodies on transmission lines is a basic measure to improve the lightning resistance level of transmission lines. The safe and reliable operation of grounding devices can ensure the safe and stable operation of transmission lines.

[0003] At present, the measurement of the grounding device of the transmission line is the measurement of the grounding resistance of the tower. The present invention proposes a tower grounding resistance detection method based on a clamp-on transformer, which drives the voltage transformer clamped on the tower down conductor, and then collects the current signal through the current sensor clamped on the tower down conductor, and then calculates the grounding resistance, and then performs fault judgment. It can measure multiple tower down conductors at the same time, thereby improving the speed and accuracy of detection. Summary of the invention

[0004] The invention provides a tower pole grounding resistance detection method based on a clamp-on mutual inductor, which can improve the detection speed and accuracy.

[0005] The present invention is specifically a tower grounding resistance detection method based on a clamp-on transformer, and the tower grounding resistance detection method comprises the following steps:

[0006] Step (1): controlling a signal generator to generate a sinusoidal alternating current signal;

[0007] Step (2): converting the sinusoidal AC current signal into a sinusoidal AC voltage signal for output via a current / voltage conversion module;

[0008] Step (3): adjusting the voltage value of the sinusoidal AC voltage signal through a signal conditioning module, and outputting a suitable sinusoidal AC voltage signal;

[0009] Step (4): driving a voltage sensor by means of the sinusoidal AC voltage signal;

[0010] Step (5): controlling the current sensor to collect the current signal generated by the tower down conductor;

[0011] Step (6): filtering out high-frequency interference signals through a low-pass filter;

[0012] Step (7): extracting the effective value of the current signal;

[0013] Step (8): Calculate the tower grounding resistance value according to the sinusoidal AC voltage signal and the effective value of the current signal, and display the data on a display screen;

[0014] Step (9): Determine whether the grounding resistance value is greater than the grounding resistance alarm value. If so, an alarm is issued through the alarm device, and the display screen displays that the grounding resistance is high.

[0015] The voltage sensor and the current sensor adopt clamp-on transformers, including a first voltage sensor, a first current sensor, a second voltage sensor, a second current sensor, a third voltage sensor, a third current sensor, a fourth voltage sensor, and a fourth current sensor. When performing grounding resistance detection, they are respectively clamped on each of the down conductors without the need to remove the down conductors.

[0016] The tower includes an RFID tag, and the relevant information of the tower can be read by using an RFID tag identifier, including the position of the tower and the ground resistance alarm value.

[0017] The tower pole grounding resistance value is R=k1k2U1 / I1, k1 is the voltage sensor ratio, k2 is the current sensor ratio, U1 is the primary side voltage of the voltage sensor, and I1 is the primary side current of the current sensor.

[0018] Compared with the prior art, the beneficial effects are: the tower grounding resistance detection method drives the voltage transformer clamped on the tower down conductor, and then collects the current signal through the current sensor clamped on the tower down conductor, and then calculates the grounding resistance, and then performs fault judgment; the tower grounding resistance detection method can measure multiple tower down conductors at the same time, without the need to remove the down conductors or install auxiliary electrodes, thereby improving the speed and accuracy of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a flowchart of a tower grounding resistance detection method based on a clamp-on transformer. DETAILED DESCRIPTION

[0020] The specific implementation of a tower grounding resistance detection method based on a clamp-on transformer of the present invention is described in detail below with reference to the accompanying drawings.

[0021] The tower includes an RFID tag, and the RFID tag identifier can read relevant information of the tower, including the tower position and the ground resistance alarm value.

[0022] like Figure 1As shown, the tower grounding resistance detection method of the present invention includes the following steps: (1): controlling the signal generator to generate a sinusoidal AC current signal; (2): converting the sinusoidal AC current signal into a sinusoidal AC voltage signal through a current / voltage conversion module; (3): adjusting the voltage value of the sinusoidal AC voltage signal through a signal conditioning module, and outputting a suitable sinusoidal AC voltage signal; (4): driving the voltage sensor through the sinusoidal AC voltage signal; (5): controlling the current sensor to collect the current signal generated by the tower down conductor; (6): filtering out high-frequency interference signals through a low-pass filter; (7): extracting the effective value of the current signal; (8): calculating the tower grounding resistance value R=k1k2U1 / I1 according to the sinusoidal AC voltage signal and the effective value of the current signal, where k1 is the voltage sensor ratio, k2 is the current sensor ratio, U1 is the primary side voltage of the voltage sensor, and I1 is the primary side current of the current sensor, and displaying the data through a display screen; (9): judging whether the grounding resistance value is greater than the grounding resistance alarm value, if so, issuing an alarm through an alarm device, and displaying the grounding resistance high through a display screen.

[0023] The voltage sensor and current sensor adopt clamp-on transformers, including a first voltage sensor, a first current sensor, a second voltage sensor, a second current sensor, a third voltage sensor, a third current sensor, a fourth voltage sensor, and a fourth current sensor. When performing grounding resistance detection, they are clamped on each down conductor respectively without removing the down conductor.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not intended to limit the present invention. A person skilled in the art should understand that the specific implementation of the present invention can be modified or replaced by equivalents, but these modifications or changes are within the scope of protection of the pending claims.

Claims

1. A tower grounding resistance detection method based on a clamp-on transformer, characterized in that: The tower grounding resistance detection method comprises the following steps: Step (1): controlling a signal generator to generate a sinusoidal alternating current signal; Step (2): converting the sinusoidal AC current signal into a sinusoidal AC voltage signal for output via a current / voltage conversion module; Step (3): adjusting the voltage value of the sinusoidal AC voltage signal through a signal conditioning module, and outputting a suitable sinusoidal AC voltage signal; Step (4): driving a voltage sensor by means of the sinusoidal AC voltage signal; Step (5): controlling the current sensor to collect the current signal generated by the tower down conductor; the voltage sensor and the current sensor adopt clamp-on transformers, including a first voltage sensor, a first current sensor, a second voltage sensor, a second current sensor, a third voltage sensor, a third current sensor, a fourth voltage sensor, and a fourth current sensor, which are respectively clamped on each of the down conductors when performing ground resistance detection, without removing the down conductors; Step (6): filtering out high-frequency interference signals through a low-pass filter; Step (7): extracting the effective value of the current signal; Step (8): Calculate the tower grounding resistance value according to the sinusoidal AC voltage signal and the effective value of the current signal, and display the data on a display screen; the tower grounding resistance value is R=k1k2U1 / I1, k1 is the voltage sensor ratio, k2 is the current sensor ratio, U1 is the primary side voltage of the voltage sensor, and I1 is the primary side current of the current sensor; Step (9): Determine whether the grounding resistance value is greater than the grounding resistance alarm value. If so, an alarm is issued through the alarm device, and the display screen displays that the grounding resistance is high.

2. A tower grounding resistance detection method based on clamp-on transformer according to claim 1, characterized in that: The tower includes an RFID tag, and the relevant information of the tower can be read by using an RFID tag identifier, including the position of the tower and the ground resistance alarm value.

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