CN114705949A - Fault monitoring method of outdoor power busbar - Google Patents

Abstract

The invention provides an outdoor power bus fault monitoring method, which comprises the following steps: s1, collecting target busbar current, and determining a temperature value T1 of a busbar caused by actual current according to the busbar current; s2, acquiring a temperature value T2 of the busbar in real time; s3, calculating a difference value delta T between the temperature value T1 and the temperature value T2, and comparing the temperature difference value delta T with a preset temperature threshold value; when the temperature difference delta T is smaller than the temperature threshold value, the busbar is normal; otherwise, go to step S4; s4, acquiring historical environmental parameters of a target busbar at the current moment, and determining the dirt accumulation amount of a current busbar joint according to the historical environmental parameters; s5, judging whether the current dirt accumulation amount is smaller than an allowable dirt accumulation threshold, if so, indicating that the current busbar has joint fault possibility, and if not, indicating that the current busbar has joint dirt accumulation fault; the temperature of the outdoor power busbar and the reason for causing the temperature change can be accurately analyzed.

Description

Fault monitoring method of outdoor power busbar

technical field

The invention relates to a power monitoring method, in particular to a fault monitoring method for an outdoor power busbar.

Background technique

In power transmission, the busbar is used to connect power transmission and distribution equipment. The safety and stability of its operation are an important factor related to the safety and stability of the power system. In the prior art, the fault of the power busbar is mainly caused by Manual inspection, that is, through manual inspection, there is an interval in this method, and the busbar cannot be well detected during the inspection interval. With the development of technology, although some online monitoring methods have been proposed, these The monitoring method is only to monitor and warn the current or temperature of the busbar, but the reason for the temperature change of the busbar cannot be monitored and analyzed.

Therefore, in order to solve the above technical problems, it is urgent to propose a new technical means.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present invention is to provide a fault monitoring method for outdoor power busbars, which can accurately analyze the temperature of outdoor power busbars and the causes of temperature changes, and make preliminary fault judgments, so as to make corresponding faults in advance. Operation and maintenance measures to ensure the stability of the busbar operation.

A method for monitoring the fault of an outdoor power busbar provided by the present invention comprises the following steps:

S1. Collect the target busbar current, and determine the busbar temperature value T1 caused by the actual current according to the busbar current;

S2. Collect the temperature value T2 of the busbar in real time;

S3. Calculate the difference ΔT between the temperature value T1 and the temperature value T2, and compare the temperature difference ΔT with the preset temperature threshold; when the temperature difference ΔT is less than the temperature threshold, it indicates that the busbar is normal; otherwise, go to step S4;

S4. Obtain the historical environmental parameters of the target busbar before the current time, and determine the amount of dirt accumulated at the current busbar joint according to the historical environmental parameters;

S5. Determine whether the current amount of contamination is less than the allowable contamination threshold. If so, it indicates that the current busbar has the possibility of a joint failure. If not, it indicates that the current busbar has a joint contamination failure.

Further, in step S2, the temperature value T1 is determined according to the following formula:

T1=ε·I ² ; where: ε is the calculation proportional coefficient, and I is the actual current value of the current busbar.

Further, in step S4, the historical environmental parameters include air flow rate, air particle concentration, air particle diameter and air humidity.

Further, in step S4, determining the amount of dirt accumulation at the current busbar joint includes:

Determine whether the air velocity v is greater than or equal to the air velocity threshold v', if so, calculate the contamination amount of the busbar joints by formula (1), if not, calculate the contamination amount of the busbar joints by formula (2):

Where: G is the acceleration of gravity, d is the diameter of the particles in the air, ρ _s is the density of the particles, ρ _a is the air density, θ is the air humidity, θ' is the air humidity threshold, c is the particle concentration, and s is the busbar connector Surface area, t is the accumulation time, γ is the calculation coefficient of the accumulation, and η is the air kinematic viscosity.

Beneficial effects of the present invention: through the present invention, the temperature of the outdoor power busbar and the causes causing the temperature change can be accurately analyzed, and a preliminary fault judgment can be made, which is convenient for making corresponding operation and maintenance measures in advance, and ensures the operation stability of the busbar .

Description of drawings

Below in conjunction with accompanying drawing and embodiment, the present invention is further described:

FIG. 1 is a flow chart of the present invention.

Detailed ways

The present invention is further described below:

A method for monitoring the fault of an outdoor power busbar provided by the present invention comprises the following steps:

S1. Collect the target busbar current, and determine the busbar temperature value T1 caused by the actual current according to the busbar current;

S2. Collect the temperature value T2 of the busbar in real time;

S3. Calculate the difference ΔT between the temperature value T1 and the temperature value T2, and compare the temperature difference ΔT with the preset temperature threshold; when the temperature difference ΔT is less than the temperature threshold, it indicates that the busbar is normal; otherwise, go to step S4;

S4. Obtain the historical environmental parameters of the target busbar before the current time, and determine the amount of dirt accumulated at the current busbar joint according to the historical environmental parameters;

S5. Determine whether the current amount of contamination is less than the allowable contamination threshold. If so, it indicates that the current busbar has the possibility of joint failure. Of course, there is also the possibility of failure of the busbar itself, such as the possibility of corrosion. If not, it indicates that the current busbar If there is a joint pollution fault, the above method can accurately analyze the temperature of the outdoor power busbar and the cause of the temperature change, and make a preliminary fault judgment, which is convenient for taking corresponding operation and maintenance measures in advance to ensure the stability of the busbar operation. .

In this embodiment, in step S2, the temperature value T1 is determined according to the following formula:

T1=ε·I ² ; where: ε is the calculation proportional coefficient, and I is the actual current value of the current busbar.

In this embodiment, in step S4, the historical environmental parameters include air flow rate, air particle concentration, air particle diameter, and air humidity.

In this embodiment, in step S4, determining the amount of dirt accumulated in the current busbar joint includes:

Determine whether the air velocity v is greater than or equal to the air velocity threshold v', if so, calculate the contamination amount of the busbar joints by formula (1), if not, calculate the contamination amount of the busbar joints by formula (2):

Where: G is the acceleration of gravity, d is the diameter of the particles in the air, ρ _s is the density of the particles, ρ _a is the air density, θ is the air humidity, θ' is the air humidity threshold, c is the particle concentration, and s is the busbar connector Surface area, t is the accumulation time, γ is the calculation coefficient of the accumulation, and η is the air kinematic viscosity. Through the above method, the accumulation state of the busbar joint can be accurately judged, which is beneficial to the accuracy of the final structure.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent replacements without departing from the spirit and scope of the technical solutions of the present invention should be included in the scope of the claims of the present invention.

Claims (4)

1. an outdoor power busbar fault monitoring method, is characterized in that: comprise the following steps: S1. Collect the target busbar current, and determine the busbar temperature value T1 caused by the actual current according to the busbar current; S2. Collect the temperature value T2 of the busbar in real time; S3. Calculate the difference ΔT between the temperature value T1 and the temperature value T2, and compare the temperature difference ΔT with the preset temperature threshold; when the temperature difference ΔT is less than the temperature threshold, it indicates that the busbar is normal; otherwise, go to step S4; S4. Obtain the historical environmental parameters of the target busbar before the current time, and determine the amount of dirt accumulated at the current busbar joint according to the historical environmental parameters; S5. Determine whether the current amount of contamination is less than the allowable contamination threshold. If so, it indicates that the current busbar has the possibility of a joint failure. If not, it indicates that the current busbar has a joint contamination failure. 2. The method for monitoring an outdoor power busbar fault according to claim 1, wherein in step S2, the temperature value T1 is determined according to the following formula: T1=ε·I ² ; where: ε is the calculation proportional coefficient, and I is the actual current value of the current busbar. 3. The method for monitoring an outdoor power busbar fault according to claim 1, wherein in step S4, the historical environmental parameters include air flow rate, air particle concentration, air particle diameter and air humidity. 4. The method for monitoring faults of outdoor power busbars according to claim 3, wherein in step S4, determining the amount of dirt accumulated at the current busbar joints comprises: Determine whether the air velocity v is greater than or equal to the air velocity threshold v', if so, calculate the contamination amount of the busbar joints by formula (1), if not, calculate the contamination amount of the busbar joints by formula (2):

Where: G is the acceleration of gravity, d is the diameter of the particles in the air, ρ _s is the density of the particles, ρ _a is the air density, θ is the air humidity, θ' is the air humidity threshold, c is the particle concentration, and s is the busbar connector Surface area, t is the accumulation time, γ is the calculation coefficient of the accumulation, and η is the air kinematic viscosity.

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