CN110579697A - Multifunctional insulation detection device based on direct current system and detection method thereof - Google Patents
Multifunctional insulation detection device based on direct current system and detection method thereof Download PDFInfo
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- CN110579697A CN110579697A CN201911021879.7A CN201911021879A CN110579697A CN 110579697 A CN110579697 A CN 110579697A CN 201911021879 A CN201911021879 A CN 201911021879A CN 110579697 A CN110579697 A CN 110579697A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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Abstract
the invention provides a multifunctional insulation detection device based on a direct current system, which comprises a voltage signal acquisition unit, a first A/D conversion unit, a current signal acquisition unit, a second A/D conversion unit, a control processing unit, a storage unit, a display unit, a key input unit, an alarm unit, a communication unit, a CT (computed tomography) drive unit and a constant current source output unit, wherein the voltage signal acquisition unit is connected with the first A/D conversion unit; the insulation detection device obtains alternating current components by adopting Fourier transform on the acquired voltage signals, then judges whether alternating current enters the direct current system or not, and judges whether a ground fault occurs or not according to the current signals acquired by the current signal acquisition unit. The invention provides a multifunctional insulation detection device and method based on a direct current system, which increase the detection of alternating current ingress, can realize more comprehensive detection on the direct current system, and improve the reliability and safety of the direct current system.
Description
Technical Field
The invention belongs to the technical field of electric power detection, and particularly relates to a multifunctional insulation detection device based on a direct current system and a detection method thereof.
background
The direct current system mainly provides a stable and reliable working power supply for a storage battery, a relay protection device and an automatic control device, and is one of important components of a power system. The reliability, safety and stability of a direct current system in an electric power system play a very important role in the safe and reliable continuous operation of core parts of the electric power system such as a power plant, a transformer substation and the like.
When a point of ground fault occurs in the direct current system, the system can still normally operate, and short circuit cannot occur. However, in order to avoid the occurrence of a short-circuit fault caused by grounding of the other electrode, which may cause abnormal actions such as control loop and relay protection, it is necessary to perform real-time detection on the dc system, and an alarm signal can be sent out in time when a ground fault occurs. The invention provides an insulation detection device for a direct current system, which is used for increasing the detection of alternating current entering, realizing the detection of the direct current system in multiple aspects and improving the reliability and the safety of the direct current system.
disclosure of Invention
The invention provides a multifunctional insulation detection device and method based on a direct current system, which increase the detection of alternating current ingress, can realize more comprehensive detection on the direct current system, and improve the reliability and safety of the direct current system.
the invention particularly relates to a multifunctional insulation detection device based on a direct current system, which comprises a voltage signal acquisition unit, a first A/D conversion unit, a current signal acquisition unit, a second A/D conversion unit, a control processing unit, a storage unit, a display unit, a key input unit, an alarm unit, a communication unit, a CT (computed tomography) driving unit and a constant current source output unit, wherein the voltage signal acquisition unit is connected with the first A/D conversion unit, the current signal acquisition unit is connected with the second A/D conversion unit, and the control processing unit is respectively connected with the first A/D conversion unit, the second A/D conversion unit, the storage unit, the display unit, the key input unit, the alarm unit, the communication unit, The current signal acquisition unit is also respectively connected with the CT driving unit and the constant current source output unit; the insulation detection device obtains alternating current components from the acquired voltage signals by adopting Fourier transform, further judges whether alternating current enters the direct current system, judges whether a ground fault occurs according to the current signals acquired by the current signal acquisition unit, determines the specific position and sends out alarm signals in time through the alarm unit.
the voltage signal acquisition unit acquires voltage signals by adopting a differential operational amplifier circuit and inputs the voltage signals into the first A/D conversion unit for A/D conversion.
The current signal acquisition unit adopts a leakage current sensor to acquire leakage current of the direct current system branch, and the leakage current sensor is arranged on each branch of the direct current system; and the CT driving unit receives the driving signal of the control processing unit and further drives the leakage current sensor to acquire signals.
the key input unit can realize a man-machine interaction function by combining the storage unit and the display unit; the alarm unit adopts an audible and visual alarm, when the direct current system fails, an audible and visual alarm signal can be sent out, and the display unit is used for displaying the failure.
The communication unit adopts an RS485 communication circuit, has good anti-interference performance and can upload the detection result and the alarm signal of the insulation detection device to a monitoring center; the insulation detection device can also receive a control signal of the monitoring center through the communication unit.
the control processing unit performs Fourier transform on the voltage signal acquired by the voltage signal acquisition unit, extracts an alternating voltage signal and calculates an effective value of the alternating voltage signal; taking the average value of the voltage signals collected by the voltage signal collecting unit in a single period as a direct current voltage value to obtain a positive electrode ground voltage signal and a negative electrode ground voltage signal of the direct current system; and the control processing unit judges whether the direct current system has ground fault according to the current signal acquired by the leakage current signal acquisition unit.
The constant current source output unit outputs a constant current power supply which is used as a standard source for calibrating the leakage current sensor, and the leakage current sensor can be accurately calibrated.
the invention also provides a detection method based on the multifunctional insulation detection device of the direct current system, and the detection method comprises the following steps:
Step (1): the voltage signal acquisition unit acquires the voltage signal of the direct current system, and the leakage current signal acquisition unit acquires the leakage current of the branch of the direct current system;
step (2): the direct current system voltage signal is subjected to A/D conversion through the first A/D conversion unit, and the direct current system branch leakage current signal is subjected to A/D conversion through the second A/D conversion unit;
And (3): the control processing unit controls the storage unit to store the acquired signals;
and (4): the control processing unit performs Fourier transform on the acquired voltage signal, extracts an alternating voltage signal, calculates an effective value of the alternating voltage signal, sends an alarm signal through the alarm unit if the effective value of the alternating voltage signal is greater than zero, and displays alternating current entering alarm and the effective value of the alternating voltage signal through the display unit;
And (5): calculating the average value of the voltage signals acquired by the voltage signal acquisition unit in a single period, wherein the average value of the voltage signals is a direct current voltage value, and obtaining a positive electrode ground voltage signal and a negative electrode ground voltage signal of the direct current system;
and (6): the control processing unit judges whether the direct current system has ground fault according to whether the leakage current signal acquisition unit acquires a current signal; if a ground fault occurs, calculating a ground resistance by combining the positive voltage-to-ground signal and the negative voltage-to-ground signal, sending an alarm signal through the alarm unit, and displaying the ground fault, a ground current value and a ground resistance value through the display unit;
And (7): and uploading the detection result to the monitoring center through the communication unit.
Drawings
FIG. 1 is a schematic structural diagram of a multifunctional insulation detection device based on a DC system according to the present invention;
Fig. 2 is a flow chart of a detection method of the multifunctional insulation detection device based on the dc system according to the present invention.
Detailed Description
the following describes in detail a specific embodiment of the multifunctional insulation detection device based on a dc system according to the present invention with reference to the accompanying drawings.
as shown in fig. 1, the multifunctional insulation detection device of the present invention comprises a voltage signal acquisition unit, a first a/D conversion unit, a current signal acquisition unit, a second a/D conversion unit, a control processing unit, a storage unit, a display unit, a key input unit, an alarm unit, a communication unit, a CT drive unit, and a constant current source output unit, wherein the voltage signal acquisition unit is connected with the first a/D conversion unit, the current signal acquisition unit is connected with the second a/D conversion unit, the control processing unit is respectively connected with the first a/D conversion unit, the second a/D conversion unit, the storage unit, the display unit, the key input unit, the alarm unit, the communication unit, the CT drive unit, and the constant current source output unit, the current signal acquisition unit is also connected with the CT drive unit and the constant current source output unit respectively; the insulation detection device obtains alternating current components from the acquired voltage signals by adopting Fourier transform, further judges whether alternating current enters the direct current system, judges whether a ground fault occurs according to the current signals acquired by the current signal acquisition unit, determines the specific position and sends out alarm signals in time through the alarm unit.
The voltage signal acquisition unit acquires voltage signals by adopting a differential operational amplifier circuit and inputs the voltage signals into the first A/D conversion unit for A/D conversion.
the current signal acquisition unit adopts a leakage current sensor to acquire leakage current of the direct current system branch, and the leakage current sensor is arranged on each branch of the direct current system; and the CT driving unit receives the driving signal of the control processing unit and further drives the leakage current sensor to acquire signals.
The key input unit can realize a man-machine interaction function by combining the storage unit and the display unit; the alarm unit adopts an audible and visual alarm, when the direct current system fails, an audible and visual alarm signal can be sent out, and the display unit is used for displaying the failure.
The communication unit adopts an RS485 communication circuit, has good anti-interference performance and can upload the detection result and the alarm signal of the insulation detection device to a monitoring center; the insulation detection device can also receive a control signal of the monitoring center through the communication unit.
The control processing unit performs Fourier transform on the voltage signal acquired by the voltage signal acquisition unit, extracts an alternating voltage signal and calculates an effective value of the alternating voltage signal; taking the average value of the voltage signals collected by the voltage signal collecting unit in a single period as a direct current voltage value to obtain a positive electrode ground voltage signal and a negative electrode ground voltage signal of the direct current system; and the control processing unit judges whether the direct current system has ground fault according to the current signal acquired by the leakage current signal acquisition unit.
the constant current source output unit outputs a constant current power supply which is used as a standard source for calibrating the leakage current sensor, and the leakage current sensor can be accurately calibrated.
as shown in fig. 2, the detection method of the present invention comprises the following steps:
Step (1): the voltage signal acquisition unit acquires the voltage signal of the direct current system, and the leakage current signal acquisition unit acquires the leakage current of the branch of the direct current system;
Step (2): the direct current system voltage signal is subjected to A/D conversion through the first A/D conversion unit, and the direct current system branch leakage current signal is subjected to A/D conversion through the second A/D conversion unit;
And (3): the control processing unit controls the storage unit to store the acquired signals;
and (4): the control processing unit performs Fourier transform on the acquired voltage signal, extracts an alternating voltage signal, calculates an effective value of the alternating voltage signal, sends an alarm signal through the alarm unit if the effective value of the alternating voltage signal is greater than zero, and displays alternating current entering alarm and the effective value of the alternating voltage signal through the display unit;
And (5): calculating the average value of the voltage signals acquired by the voltage signal acquisition unit in a single period, wherein the average value of the voltage signals is a direct current voltage value, and obtaining a positive electrode ground voltage signal and a negative electrode ground voltage signal of the direct current system;
And (6): the control processing unit judges whether the direct current system has ground fault according to whether the leakage current signal acquisition unit acquires a current signal; if a ground fault occurs, calculating a ground resistance by combining the positive voltage-to-ground signal and the negative voltage-to-ground signal, sending an alarm signal through the alarm unit, and displaying the ground fault, a ground current value and a ground resistance value through the display unit;
and (7): and uploading the detection result to the monitoring center through the communication unit.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The multifunctional insulation detection device based on the direct current system is characterized by comprising a voltage signal acquisition unit, a first A/D conversion unit, a current signal acquisition unit, a second A/D conversion unit, a control processing unit, a storage unit, a display unit, a key input unit, an alarm unit, a communication unit, a CT (computed tomography) driving unit and a constant current source output unit, wherein the voltage signal acquisition unit is connected with the first A/D conversion unit, the current signal acquisition unit is connected with the second A/D conversion unit, and the control processing unit is respectively connected with the first A/D conversion unit, the second A/D conversion unit, the storage unit, the display unit, the key input unit, the alarm unit, the communication unit, The current signal acquisition unit is also respectively connected with the CT driving unit and the constant current source output unit; the insulation detection device obtains alternating current components from the acquired voltage signals by adopting Fourier transform, further judges whether alternating current enters the direct current system, judges whether a ground fault occurs according to the current signals acquired by the current signal acquisition unit, determines the specific position and sends out alarm signals in time through the alarm unit.
2. The multifunctional insulation detection device based on the direct current system according to claim 1, wherein the voltage signal acquisition unit acquires a voltage signal by using a differential operational amplifier circuit and inputs the voltage signal to the first A/D conversion unit for A/D conversion.
3. The multifunctional insulation detection device based on the direct current system according to claim 2, wherein the current signal collection unit collects the leakage current of the branches of the direct current system by using leakage current sensors, and the leakage current sensors are installed on the branches of the direct current system; and the CT driving unit receives the driving signal of the control processing unit and further drives the leakage current sensor to acquire signals.
4. The multifunctional insulation detection device based on the direct current system as claimed in claim 3, wherein the key input unit is capable of realizing a human-computer interaction function in combination with the storage unit and the display unit; the alarm unit adopts an audible and visual alarm, when the direct current system fails, an audible and visual alarm signal can be sent out, and the display unit is used for displaying the failure.
5. the multifunctional insulation detection device based on the direct current system according to claim 4, wherein the communication unit adopts an RS485 communication circuit, has good anti-interference performance, and can upload the detection result and the alarm signal of the insulation detection device to a monitoring center; the insulation detection device can also receive a control signal of the monitoring center through the communication unit.
6. The multifunctional insulation detection device based on the direct current system according to claim 5, wherein the control processing unit performs Fourier transform on the voltage signal collected by the voltage signal collection unit, extracts an alternating current voltage signal, and calculates an effective value of the alternating current voltage signal; taking the average value of the voltage signals collected by the voltage signal collecting unit in a single period as a direct current voltage value to obtain a positive electrode ground voltage signal and a negative electrode ground voltage signal of the direct current system; and the control processing unit judges whether the direct current system has ground fault according to the current signal acquired by the leakage current signal acquisition unit.
7. The multifunctional insulation detection device based on DC system as recited in claim 6, wherein said constant current source output unit outputs a constant current power source as a standard source for calibrating said leakage current sensor, so as to calibrate said leakage current sensor accurately.
8. An insulation detection method based on the multifunctional insulation detection device based on the DC system of any one of claims 1 to 7, characterized in that the detection method comprises the following steps:
Step (1): the voltage signal acquisition unit acquires the voltage signal of the direct current system, and the leakage current signal acquisition unit acquires the leakage current of the branch of the direct current system;
step (2): the direct current system voltage signal is subjected to A/D conversion through the first A/D conversion unit, and the direct current system branch leakage current signal is subjected to A/D conversion through the second A/D conversion unit;
And (3): the control processing unit controls the storage unit to store the acquired signals;
And (4): the control processing unit performs Fourier transform on the acquired voltage signal, extracts an alternating voltage signal, calculates an effective value of the alternating voltage signal, sends an alarm signal through the alarm unit if the effective value of the alternating voltage signal is greater than zero, and displays alternating current entering alarm and the effective value of the alternating voltage signal through the display unit;
And (5): calculating the average value of the voltage signals acquired by the voltage signal acquisition unit in a single period, wherein the average value of the voltage signals is a direct current voltage value, and obtaining a positive electrode ground voltage signal and a negative electrode ground voltage signal of the direct current system;
And (6): the control processing unit judges whether the direct current system has ground fault according to whether the leakage current signal acquisition unit acquires a current signal; if a ground fault occurs, calculating a ground resistance by combining the positive voltage-to-ground signal and the negative voltage-to-ground signal, sending an alarm signal through the alarm unit, and displaying the ground fault, a ground current value and a ground resistance value through the display unit;
And (7): and uploading the detection result to the monitoring center through the communication unit.
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| CN201911021879.7A CN110579697A (en) | 2019-10-25 | 2019-10-25 | Multifunctional insulation detection device based on direct current system and detection method thereof |
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