CN110967662A - Calibration method of DC leakage current sensor for insulation monitoring of DC system - Google Patents
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Abstract
本发明涉及一种直流系统绝缘监测直流漏电流传感器的校准方法，属于直流系统绝缘监测技术领域；应用于直流系统绝缘监测直流漏电流传感器的系统，所述直流系统绝缘监测直流漏电流传感器的系统包括直流系统绝缘监测装置、直流漏电流传感器数据采集装置、开口式直流漏电流传感器；所述直流系统绝缘监测直流漏电流传感器的校准方法包括直流系统绝缘情况判断，直流系统正、负极对地电压值采集及漏电流值获取，漏电流校准值计算；实现“零漂”问题自动校准，无需增加额外的电桥组合，适用于采用“不平衡桥法+直流漏电流法”的直流系统绝缘监测装置。
The invention relates to a calibration method for a DC system insulation monitoring DC leakage current sensor, belonging to the technical field of DC system insulation monitoring; it is applied to a DC system insulation monitoring DC leakage current sensor system, and the DC system insulation monitoring DC leakage current sensor system It includes a DC system insulation monitoring device, a DC leakage current sensor data acquisition device, and an open-type DC leakage current sensor; the calibration method of the DC system insulation monitoring DC leakage current sensor includes judging the insulation condition of the DC system, the voltage of the positive and negative electrodes of the DC system to the ground Value acquisition and leakage current value acquisition, leakage current calibration value calculation; realize automatic calibration of "zero drift" problem, no need to add additional bridge combination, suitable for DC system insulation monitoring using "unbalanced bridge method + DC leakage current method" device.
Description
Technical Field
The invention relates to a calibration method of a direct current leakage current sensor for insulation monitoring of a direct current system, and belongs to the technical field of insulation monitoring of the direct current system.
Background
At present, a direct current system insulation monitoring device of a transformer substation basically adopts a direct current leakage current method to carry out branch insulation fault positioning and branch resistance calculation. The direct current leakage current method is necessarily used for collecting direct current leakage current by using a direct current leakage current sensor. The dc leakage current sensor can be divided into two types according to its configuration, one is a closed dc leakage current sensor, and the other is an open dc leakage current sensor. The open type leakage current sensor has good linearity, but the problem of zero drift caused by the environmental influence of a geomagnetic field and the like easily, namely the problem that the output zero point of the sensor deviates from an actual value, so that the insulation monitoring device adopting the open type direct current leakage current sensor to carry out insulation fault branch positioning and resistance calculation often has the problems of misselection of branches and inaccurate calculation of the grounding resistance of the fault branches. The prior direct current leakage current sensor is usually calibrated by manually zeroing through a physical knob, which is time-consuming and labor-consuming. Aiming at the problems, the calibration method of the direct current system insulation monitoring direct current leakage current sensor is provided, and insulation monitoring branch circuit line selection and branch circuit resistance calculation accuracy are guaranteed when the open direct current leakage current sensor is used.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method overcomes the defects of the prior art, provides a calibration method of a direct current system insulation monitoring direct current leakage current sensor, and realizes the automatic calibration of the zero drift problem.
The invention relates to a calibration method of a DC leakage current sensor for insulation monitoring of a DC system, which is applied to a system of the DC leakage current sensor for insulation monitoring of the DC system, the system for the direct current system insulation monitoring direct current leakage current sensor comprises a direct current system insulation monitoring device, a direct current leakage current sensor data acquisition device and an open type direct current leakage current sensor, wherein the direct current system insulation monitoring device comprises two balance bridge resistors R which are respectively connected to a positive pole and a negative pole of a bus, and further comprises two detection bridge resistors R1 and R2, the two detection bridge resistors R1 and R2 are respectively connected to the positive pole and the negative pole of the bus, two detection bridge switches S1 and S2 are connected between the two detection bridge resistors R1 and R2 and the bus in series, and further comprises a compensation bridge resistor R3, the compensation bridge resistor R3 is connected to the negative pole of the bus, and a compensation bridge switch S3 is connected to the compensation bridge resistor R3 in series; the calibration method of the direct current leakage current sensor for insulation monitoring of the direct current system comprises the steps of judging the insulation condition of the direct current system, collecting the voltage values of the positive electrode and the negative electrode of the direct current system to earth, acquiring the leakage current value and calculating the leakage current calibration value.
The open type direct current leakage current sensor is used for inducing and converting direct current positive and negative bus direct current leakage current signals into voltage signals which can be acquired by a direct current leakage current sensor data acquisition device; the direct current leakage current sensor data acquisition device is used for acquiring the voltage signal converted by the open type direct current leakage current sensor and communicating with the insulation monitoring device of the current system, and the communication mode can be RS 485.
Preferably, the steps of collecting the voltages of the positive electrode and the negative electrode of the direct current system to ground and obtaining the leakage current value by the direct current system insulation monitoring device are as follows:
step S201, only inputting a balance bridge resistor R, and collecting the voltage V1+ of the anode and the voltage V1-of the cathode of the direct current system at the moment;
step S202, acquiring an output value I1 of the open type direct current leakage current sensor in a state of only putting into a balance bridge resistor R, namely a leakage current value I1, through a direct current leakage current sensor data acquisition device;
step S203, inputting a positive pole detection bridge resistor R1, and acquiring a voltage V2+ to ground of a positive pole and a voltage V2-to ground of a negative pole of the direct current system at the moment;
step S204, acquiring an output value I2 of the open type direct current leakage current sensor in a state of putting the direct current leakage current sensor into a positive electrode detection bridge resistor R1 through a data acquisition device of the direct current leakage current sensor, namely a leakage current value I2;
step S205, inputting a compensation bridge resistor R3, and acquiring the voltage V3+ of the anode and the voltage V3-of the cathode of the direct current system at the moment;
in step S206, an output value I3 of the open-type dc leakage current sensor, i.e., a leakage current value I3, in a state where the compensation bridge resistor R3 is applied is obtained by the dc leakage current sensor data collecting device.
Preferably, the steps of collecting the voltages of the positive electrode and the negative electrode of the direct current system to ground and obtaining the leakage current value by the direct current system insulation monitoring device are as follows:
step S201, only inputting a balance bridge resistor R, and collecting the voltage V1+ of the anode and the voltage V1-of the cathode of the direct current system at the moment;
step S202, acquiring an output value I1 of the open type direct current leakage current sensor in a state of only putting into a balance bridge resistor, namely a leakage current value I1, through a direct current leakage current sensor data acquisition device;
step S203, inputting a negative electrode detection bridge resistor R2, and acquiring a voltage V2+ of the positive electrode of the direct current system and a voltage V2-of the negative electrode of the direct current system at the moment;
step S204, acquiring an output value I2 of the open type direct current leakage current sensor in a state of putting the negative electrode detection bridge resistor R2 into the open type direct current leakage current sensor through a direct current leakage current sensor data acquisition device, namely a leakage current value I2;
step S205, inputting a compensation bridge resistor R3, and acquiring the voltage V3+ of the anode and the voltage V3-of the cathode of the direct current system at the moment;
in step S206, an output value I3 of the open-type dc leakage current sensor, i.e., a leakage current value I3, in a state where the compensation bridge resistor R3 is applied is obtained by the dc leakage current sensor data collecting device.
Preferably, the leakage current calibration value calculation formula according to ohm's law is as follows:
wherein, R + is the anode grounding resistance of the assumed system branch, R-is the cathode grounding resistance of the assumed system branch, and at the moment, three equations and three unknowns R +, R, I0 are provided, and the leakage current calibration value I0 can be obtained by solving the equations.
Preferably, when the insulation condition of the direct current system is intact, the leakage current value is a leakage current calibration value; otherwise, collecting the voltage values of the positive electrode and the negative electrode of the direct current system to ground, and calculating the leakage current calibration value according to the voltage values of the positive electrode and the negative electrode to ground and the leakage current value.
Preferably, the calibration method of the dc leakage current sensor for insulation monitoring of the dc system includes the following steps:
step S001, start;
s002, judging whether the calibration time of the preset open type direct current leakage current sensor is reached by the direct current system insulation monitoring device;
step S101, calculating and judging the insulation condition of the direct current system by the direct current system insulation monitoring device through inputting and withdrawing two detection bridge resistors R1 and R2;
step S102, if the insulation condition of the direct current system is intact, the output value of the open type direct current leakage current sensor obtained by the direct current system insulation monitoring device through the direct current leakage current sensor data acquisition device is a calibration value I0, step S302 is executed, otherwise step S201 is executed;
step S201, only inputting a balance bridge resistor R, and collecting the voltage V1+ of the anode and the voltage V1-of the cathode of the direct current system at the moment;
step S202, acquiring an output value I1 of the open type direct current leakage current sensor in a state of only putting into a balance bridge resistor, namely a leakage current value I1, through a direct current leakage current sensor data acquisition device;
step S203, inputting a positive pole detection bridge resistor R1, and acquiring a voltage V2+ to ground of a positive pole and a voltage V2-to ground of a negative pole of the direct current system at the moment;
step S204, acquiring an output value I2 of the open type direct current leakage current sensor in a state of putting the direct current leakage current sensor into a positive electrode detection bridge resistor R1 through a data acquisition device of the direct current leakage current sensor, namely a leakage current value I2;
step S205, inputting a compensation bridge resistor R3, and acquiring the voltage V3+ of the anode and the voltage V3-of the cathode of the direct current system at the moment;
step S206, acquiring an output value I3 of the open type direct current leakage current sensor in a state of putting compensation bridge resistor R3, namely a leakage current value I3, through a direct current leakage current sensor data acquisition device;
step S301, calculating a leakage current calibration value I0;
in step S302, the dc system insulation monitoring device saves and records the leakage current calibration value I0.
Here, the actual leakage current value of the branch is the difference between the leakage current value actually acquired by the data acquisition device of the direct current leakage current sensor and I0; when insulation reduction occurs, the stored leakage current calibration value I0 participates in calculation to obtain an accurate branch resistance calculation value, so that automatic calibration of the 'null shift' problem is realized.
Preferably, the calibration method of the dc leakage current sensor for insulation monitoring of the dc system includes the following steps:
step S001, start;
s002, judging whether the calibration time of the preset open type direct current leakage current sensor is reached by the direct current system insulation monitoring device;
step S101, calculating and judging the insulation condition of the direct current system by the direct current system insulation monitoring device through inputting and withdrawing two detection bridge resistors R1 and R2;
step S102, if the insulation condition of the direct current system is intact, the output value of the open type direct current leakage current sensor obtained by the direct current system insulation monitoring device through the direct current leakage current sensor data acquisition device is a calibration value I0, step S302 is executed, otherwise step S201 is executed;
step S201, only inputting a balance bridge resistor R, and collecting the voltage V1+ of the anode and the voltage V1-of the cathode of the direct current system at the moment;
step S202, acquiring an output value I1 of the open type direct current leakage current sensor in a state of only putting into a balance bridge resistor, namely a leakage current value I1, through a direct current leakage current sensor data acquisition device;
step S203, inputting a negative electrode detection bridge resistor R2, and acquiring a voltage V2+ of the positive electrode of the direct current system and a voltage V2-of the negative electrode of the direct current system at the moment;
step S204, acquiring an output value I2 of the open type direct current leakage current sensor in a state of putting the negative electrode detection bridge resistor R2 into the open type direct current leakage current sensor through a direct current leakage current sensor data acquisition device, namely a leakage current value I2;
step S205, inputting a compensation bridge resistor R3, and acquiring the voltage V3+ of the anode and the voltage V3-of the cathode of the direct current system at the moment;
step S206, acquiring an output value I3 of the open type direct current leakage current sensor in a state of putting compensation bridge resistor R3, namely a leakage current value I3, through a direct current leakage current sensor data acquisition device;
step S301, calculating a leakage current calibration value I0;
in step S302, the dc system insulation monitoring device saves and records the leakage current calibration value I0.
Here, the actual leakage current value of the branch is the difference between the leakage current value actually acquired by the data acquisition device of the direct current leakage current sensor and I0; when insulation reduction occurs, the stored leakage current calibration value I0 participates in calculation to obtain an accurate branch resistance calculation value, so that automatic calibration of the 'null shift' problem is realized.
Preferably, the resistances of the sensing bridge resistors R1 and R2 are the same.
Preferably, the detection bridge is an unbalanced bridge.
Compared with the prior art, the invention has the following beneficial effects:
the calibration method for the direct current leakage current sensor for insulation monitoring of the direct current system is used for automatically calibrating the open type direct current leakage current sensor, the traditional method for manually adjusting the calibration of the physical knob of the leakage current sensor is replaced, the calibration efficiency and frequency of the sensor are improved, manpower is saved, and the calibration timeliness of the sensor is guaranteed. When the insulation monitoring device of the direct current system uses the open type direct current leakage current sensor to carry out insulation monitoring on the direct current system, the problems of line selection errors and inaccurate branch line selection resistance calculation caused by the null shift problem of the open type direct current leakage current sensor can be avoided. Therefore, the accuracy of the insulation monitoring condition of the direct current system is realized, extra bridge combination is not required to be added in the scheme, and the method is suitable for the direct current system insulation monitoring device adopting an unbalanced bridge method and a direct current leakage current method.
Drawings
FIG. 1 is a schematic structural diagram of a system for insulation monitoring of a DC leakage current sensor of a DC system according to the present invention;
fig. 2 is a flowchart of a calibration method of a system for insulation monitoring of a dc leakage current sensor of a dc system according to embodiment 1 of the present invention;
fig. 3 is a flowchart of a calibration method for a system of an insulation monitoring dc leakage current sensor of a dc system according to embodiment 2 of the present invention. .
The method comprises the following steps that 1, a direct current system insulation monitoring device is arranged; 2. a DC leakage current sensor data acquisition device; 3. open type direct current leakage current sensor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example 1
As shown in fig. 1-2, the calibration method of the dc leakage current sensor for insulation monitoring of the dc system according to the present invention is applied to a system of a dc leakage current sensor for insulation monitoring of the dc system, the system of the dc leakage current sensor for insulation monitoring of the dc system includes a dc system insulation monitoring device 1, a dc leakage current sensor data collecting device 2, and an open dc leakage current sensor 3, the dc system insulation monitoring device 1 includes two balance bridge resistors R, the two balance bridge resistors R are respectively connected to a positive electrode and a negative electrode of a bus, and further includes two detection bridge resistors R1 and R2, the two detection bridge resistors R1 and R2 are respectively connected to the positive electrode and the negative electrode of the bus, two detection bridge switches S1 and S2 are connected in series between the two detection bridge resistors R1 and R2 and the bus, and further includes a compensation bridge resistor R3, the compensation bridge resistor R3 is connected to the negative electrode of the bus, a compensation bridge switching switch S3 is connected in series with the compensation bridge resistor R3, the resistances of the detection bridge resistors R1 and R2 are the same, and the detection bridge is an unbalanced bridge; the calibration method of the direct current leakage current sensor for insulation monitoring of the direct current system comprises the steps of judging the insulation condition of the direct current system, collecting the voltage values of the positive electrode and the negative electrode of the direct current system to earth, acquiring the leakage current value and calculating the leakage current calibration value.
The calibration method of the direct current leakage current sensor for insulation monitoring of the direct current system comprises the following steps:
step S001, start;
step S002, the direct current system insulation monitoring device 1 judges whether the preset open type direct current leakage current sensor 3 calibration time is reached;
here, the calibration time may be set once every 7 days, or may be set at other intervals according to actual conditions.
Step S101, calculating and judging the insulation condition of the direct current system by the direct current system insulation monitoring device 1 through inputting and withdrawing two detection bridge resistors R1 and R2;
here, the dc system insulation condition can be determined by the unbalanced bridge method inherent to the dc system insulation monitoring apparatus 1.
Step S102, if the insulation condition of the direct current system is intact, the output value of the open type direct current leakage current sensor 3 obtained by the direct current system insulation monitoring device 1 through the direct current leakage current sensor data acquisition device 2 is a calibration value I0, step S302 is executed, otherwise, step S201 is executed;
step S201, only inputting a balance bridge resistor R, and collecting the voltage V1+ of the anode and the voltage V1-of the cathode of the direct current system at the moment;
step S202, acquiring an output value I1 of the open type direct current leakage current sensor 3 in a state of only putting into a balance bridge resistor, namely a leakage current value I1, through the direct current leakage current sensor data acquisition device 2;
step S203, inputting a positive pole detection bridge resistor R1, and acquiring a voltage V2+ to ground of a positive pole and a voltage V2-to ground of a negative pole of the direct current system at the moment;
step S204, acquiring an output value I2 of the open type direct current leakage current sensor 3 in a state of putting the positive electrode detection bridge resistor R1 into the data acquisition device 2 of the direct current leakage current sensor, namely a leakage current value I2;
step S205, inputting a compensation bridge resistor R3, and acquiring the voltage V3+ of the anode and the voltage V3-of the cathode of the direct current system at the moment;
step S206, acquiring an output value I3 of the open type direct current leakage current sensor 3 in a state of putting compensation bridge resistor R3, namely a leakage current value I3, through the direct current leakage current sensor data acquisition device 2;
step S301, simultaneous formula:
calculating a leakage current calibration value I0, wherein R + is the anode grounding resistance of the assumed system branch, R-is the cathode grounding resistance of the assumed system branch, at the moment, three equations and three unknowns R +, R, I0 are provided, and the leakage current calibration value I0 can be obtained by solving the equations;
in step S302, the dc system insulation monitoring device 1 saves and records the leakage current calibration value I0.
Here, the actual leakage current value of the branch is the difference between the leakage current value actually acquired by the dc leakage current sensor data acquisition device 2 and I0; when insulation reduction occurs, the stored leakage current calibration value I0 participates in calculation to obtain an accurate branch resistance calculation value, so that automatic calibration of the 'null shift' problem is realized.
Example 2
As shown in fig. 1 and fig. 3, the calibration method for dc leakage current sensor for insulation monitoring of dc system according to the present invention is applied to a system for dc leakage current sensor for insulation monitoring of dc system, the system for dc leakage current sensor for insulation monitoring of dc system comprises a dc system insulation monitoring device 1, a dc leakage current sensor data collecting device 2, and an open dc leakage current sensor 3, the dc system insulation monitoring device 1 comprises two balance bridge resistors R, the two balance bridge resistors R are respectively connected to the positive and negative electrodes of a bus, two detection bridge resistors R1 and R2, the two detection bridge resistors R1 and R2 are respectively connected to the positive and negative electrodes of the bus, two detection bridge switches S1 and S2 are connected in series between the two detection bridge resistors R1 and R2 and the bus, and a compensation bridge resistor R3, a compensation bridge resistor R3 is connected to the negative electrode of the bus, a compensation bridge switch S3 is connected in series to the compensation bridge resistor R3, the resistance values of the detection bridge resistors R1 and R2 are the same, and the detection bridge is an unbalanced bridge; the calibration method of the direct current leakage current sensor for insulation monitoring of the direct current system comprises the steps of judging the insulation condition of the direct current system, collecting the voltage values of the positive electrode and the negative electrode of the direct current system to earth, acquiring the leakage current value and calculating the leakage current calibration value.
The calibration method of the direct current leakage current sensor for insulation monitoring of the direct current system comprises the following steps:
step S001, start;
step S002, the direct current system insulation monitoring device 1 judges whether the preset open type direct current leakage current sensor 3 calibration time is reached;
here, the calibration time may be set once every 7 days, or may be set at other intervals according to actual conditions.
Step S101, calculating and judging the insulation condition of the direct current system by the direct current system insulation monitoring device 1 through inputting and withdrawing two detection bridge resistors R1 and R2;
here, the dc system insulation condition can be determined by the unbalanced bridge method inherent to the dc system insulation monitoring apparatus 1.
Step S102, if the insulation condition of the direct current system is intact, the output value of the open type direct current leakage current sensor 3 obtained by the direct current system insulation monitoring device 1 through the direct current leakage current sensor data acquisition device 2 is a calibration value I0, step S302 is executed, otherwise, step S201 is executed;
step S201, only inputting a balance bridge resistor R, and collecting the voltage V1+ of the anode and the voltage V1-of the cathode of the direct current system at the moment;
step S202, acquiring an output value I1 of the open type direct current leakage current sensor 3 in a state of only putting into a balance bridge resistor, namely a leakage current value I1, through the direct current leakage current sensor data acquisition device 2;
step S203, inputting a negative electrode detection bridge resistor R2, and acquiring a voltage V2+ of the positive electrode of the direct current system and a voltage V2-of the negative electrode of the direct current system at the moment;
step S204, acquiring an output value I2 of the open type direct current leakage current sensor 3 in a state of putting the negative electrode detection bridge resistor R2 into the data acquisition device 2 of the direct current leakage current sensor, namely a leakage current value I2;
step S205, inputting a compensation bridge resistor R3, and acquiring the voltage V3+ of the anode and the voltage V3-of the cathode of the direct current system at the moment;
step S206, acquiring an output value I3 of the open type direct current leakage current sensor 3 in a state of putting compensation bridge resistor R3, namely a leakage current value I3, through the direct current leakage current sensor data acquisition device 2;
step S301, simultaneous formula:
calculating a leakage current calibration value I0, wherein R + is the anode grounding resistance of the assumed system branch, R-is the cathode grounding resistance of the assumed system branch, at the moment, three equations and three unknowns R +, R, I0 are provided, and the leakage current calibration value I0 can be obtained by solving the equations;
in step S302, the dc system insulation monitoring device 1 saves and records the leakage current calibration value I0.
Here, the actual leakage current value of the branch is the difference between the leakage current value actually acquired by the dc leakage current sensor data acquisition device 2 and I0; when insulation reduction occurs, the stored leakage current calibration value I0 participates in calculation to obtain an accurate branch resistance calculation value, so that automatic calibration of the 'null shift' problem is realized.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, but rather the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111679210A (en) * | 2020-06-19 | 2020-09-18 | 中国电力科学研究院有限公司 | An energy storage insulation fault detection system and method capable of online positioning to sub-systems |
| CN113625142A (en) * | 2021-09-17 | 2021-11-09 | 广东电网有限责任公司 | Testing device for insulation detection of multiple types of direct current grounding faults of microcomputer type direct current system |
| CN117907915A (en) * | 2024-01-18 | 2024-04-19 | 南京国电南自电网自动化有限公司 | Zero drift measurement and compensation method and system of leakage current sensor for insulation monitoring |
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