CN110850332A - Trend statistical type grounding body monitoring method and device - Google Patents
Trend statistical type grounding body monitoring method and device Download PDFInfo
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Abstract
The invention discloses a trend statistical type grounding body monitoring method and a device, wherein the method comprises the following steps: a sampling resistor is connected in series between a zero line and a ground wire of a grounding body, a constant voltage direct current power supply is used for applying a measuring voltage, and a voltage drop value Vs of the sampling resistor is measured at a preset time interval, so that a resistance value Rbc between the zero line and the grounding body is calculated according to a resistance value Rs of the sampling resistor and a voltage value Vm of the measuring voltage; calculating to obtain the variation delta Rc of the impedance of the grounding body according to the variation condition of the resistance value Rbc; and determining whether the preset impedance requirement is met or not according to the size relation between the variation delta Rc and the preset impedance value. The technical scheme of the invention does not depend on a valuable mechanical mechanism or a traditional grounding body measuring instrument, so that when the grounding body is measured, on-line monitoring can be realized without additionally driving a grounding pile, and abnormal states can be fed back in time and protected.
Description
Technical Field
The invention relates to a grounding detection method, in particular to a trend statistical type grounding body monitoring method and device.
Background
The grounding has quite important function in a power supply and distribution system, and when unexpected conditions such as abnormal power utilization operation, lightning surge and equipment fault occur, the safety of personnel and equipment can be effectively guaranteed through the drainage function of the grounding equipment.
The electric equipment often adopts the ground connection stake or be connected to the ground connection line that set up on the spot and realize ground protection, and ground connection stake or ground connection line often can carry out preliminary detection ground connection when equipment fixing whether good, but along with the time, the condition of ground connection system can change gradually, serious probably leads to ground connection to become invalid. Some units maintain the grounding system by means of manual detection through regular arrangement, and the operation mode is complex in operation, needs professional skill for support, and needs to consume more human resources. Meanwhile, due to the restriction of various practical factors, most of electric equipment is not maintained timely, and some electric equipment cannot be maintained, so that the grounding condition of the electric equipment is worried.
The safety problem is a great problem, and in order to realize convenience of equipment grounding detection, a method and a device capable of quickly and simply realizing grounding state detection need to be invented as soon as possible, the current equipment grounding state can be accurately monitored in real time, and warning and protection can be timely given when an abnormal state is found.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a trend statistical type grounding body monitoring method and device, which do not depend on a precious mechanical mechanism or a traditional grounding body measuring instrument, so that when a grounding body is measured, on-line monitoring can be realized without additionally driving a grounding pile, and an abnormal state is fed back in time and protected.
A trend statistical grounding body monitoring method is characterized by comprising the following steps:
a sampling resistor is connected in series between the zero line of the grounding body and the ground wire of the grounding body, and a constant voltage direct current power supply is used for applying a measuring voltage;
measuring a voltage drop value Vs of the sampling resistor at preset time intervals, and calculating a resistance value Rbc between the zero line of the grounding body and the grounding body according to a resistance value Rs of the sampling resistor and a voltage value Vm of the measured voltage;
recording a variation curve of the resistance value Rbc according to the preset time interval, and calculating to obtain a variation delta Rc of the impedance of the grounding body according to the variation curve;
and if the variation Δ Rc exceeds a preset impedance value, determining that the grounding body meets a preset impedance requirement.
The utility model provides a trend statistics formula grounding body monitoring devices which characterized in that, trend statistics formula grounding body monitoring devices includes:
the sampling module is used for connecting a sampling resistor in series between a zero line of the grounding body and a ground wire of the grounding body and applying a measuring voltage by using a constant-voltage direct-current power supply;
the resistance value calculation module is used for measuring a voltage drop value Vs of the sampling resistor at preset time intervals, and calculating a resistance value Rbc between the zero line of the grounding body and the grounding body according to a resistance value Rs of the sampling resistor and a voltage value Vm of the measuring voltage;
the trend statistical module is used for recording a variation curve of the resistance value Rbc according to the preset time interval and calculating to obtain a variation delta Rc of the impedance of the grounding body according to the variation curve;
and a grounding standard confirming module, configured to determine that the grounding body meets a preset impedance requirement if the variation Δ Rc exceeds a preset impedance value.
According to the trend statistical type grounding body monitoring method and device provided by the invention, a sampling resistor is connected in series between a zero line of a grounding body and a ground wire of the grounding body, and a measuring voltage is applied to calculate and obtain a resistance value Rbc between the zero line of the grounding body and the ground wire of the grounding body, and a change curve of the resistance value Rbc along with time change is made according to the change curve along with time change, so that the change quantity delta Rc of the impedance of the grounding body is calculated and obtained, and finally, the grounding body is judged to meet the requirement of preset impedance according to the size relation between the change quantity delta Rc and the preset impedance value; the long-term monitoring of the grounding body is realized, and the feedback can be carried out in time when the grounding abnormity occurs, so that the power utilization safety is effectively guaranteed; the whole detection process is simple and convenient, detection can be completed without additionally arranging a measuring grounding pile, and the method is suitable for the situation that the measuring grounding pile cannot be driven on site due to site limitation; and a pure electronic detection processing method is adopted, so that the detection cost is greatly reduced without depending on a valuable mechanical mechanism and a traditional grounding body measuring instrument.
Drawings
FIG. 1 is a flow chart of a trend statistical grounding body monitoring method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a calculation of a resistance between a zero line of a grounding body and the grounding body according to an embodiment of the present invention;
fig. 3 is a flowchart of calculating a variation Δ Rc in the impedance of the ground body according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating a variation curve of a resistance value Rbc according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating an embodiment of the present invention for determining a grounding state of a grounding body;
FIG. 6 is a schematic diagram illustrating the measurement of the voltage between the live line and the neutral line and between the live line and the ground line of the grounding body according to the embodiment of the present invention;
fig. 7 is a schematic diagram of a trend statistics type grounding body monitoring device in an embodiment of the invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The trend statistical grounding body monitoring method provided by the invention can be applied to grounding detection and monitoring of power supply and distribution equipment. Power supply and distribution equipment including, but not limited to, distribution boxes, power supply cabinets, etc.; the grounding body comprises but is not limited to a grounding line and the like which provide grounding connection for power supply and distribution equipment; the grounding body generally comprises three lines of a live wire, a zero wire and a ground wire.
A flow chart of the trend statistical grounding body monitoring method is shown in fig. 1, and the specific flow includes the following steps:
s1: a sampling resistor is connected in series between the zero line of the grounding body and the ground wire of the grounding body, and a constant voltage direct current power supply is used for applying a measuring voltage.
In order to obtain the value of the grounding resistor, a sampling resistor is connected in series between the zero line of the grounding body and the ground line of the grounding body, and a measuring voltage is applied, and the schematic diagram is shown in fig. 2. The resistance value of the sampling resistor between the zero line (b) of the grounding body and the ground line (c) of the grounding body is Rs, and the measurement voltage value applied by the constant-voltage direct-current power supply is Vm.
S2: and measuring the voltage drop value Vs of the sampling resistor at preset time intervals, and calculating the resistance value Rbc between the zero line of the grounding body and the grounding body according to the resistance value Rs of the sampling resistor and the voltage value Vm of the measured voltage.
The predetermined time interval refers to a time frequency of the periodic sampling. After applying a measuring voltage by using a constant-voltage direct-current power supply, measuring a voltage drop value Vs of the sampling resistor; and then calculating to obtain a resistance value Rbc between the zero line of the grounding body and the grounding body according to the resistance value Rs of the sampling resistor, the voltage drop value Vs of the sampling resistor and the voltage value Vm of the measured voltage.
Preferably, the resistance value Rbc is calculated according to the following formula:
Rbc＝(Vm x Rs-Vs x Rs)/Vs
s3: and recording a variation curve of the resistance value Rbc according to a preset time interval, and calculating to obtain the variation delta Rc of the impedance of the grounding body according to the variation curve.
Since the sampling is performed periodically according to the preset time interval, a variation curve of the resistance value Rbc can be recorded along with the variation of time, and then the variation Δ Rc of the impedance of the grounding body is calculated according to the variation curve.
The measured resistance value of the zero line ground resistance Rbc comprises three main parts, namely transmission lead impedance of the zero line, earth soil impedance between a transformer and equipment and grounding body impedance, so that the Rbc has limitation and cannot represent the actual resistance value of the grounding body. The impedance of the zero line transmission lead is relatively fixed, and the variation is relatively small (negligible); the possible change of the impedance of the grounding body is a slow process which is gradually increased and is irreversible; the impedance of the earth soil may change along with seasons and environments, and the variable quantity of the impedance has uncertainty but has a periodic change rule; therefore, the change rule of the earth soil impedance in the Rbc curve is grasped through statistical analysis, the earth soil impedance changed in the Rbc is removed through an algorithm, and the fixed zero line transmission lead impedance is subtracted, so that the change amount delta Rc of the earth body impedance can be obtained.
Specifically, the amount of change Δ Rc in the ground body impedance may be calculated according to the procedure shown in fig. 3:
s31: connecting the minimum values of Rbc on the change curve to obtain a trend curve;
s32: and calculating the slope of the trend curve in the preset time interval, and taking the slope as the variation delta Rc of the impedance of the grounding body.
Fig. 4 shows a schematic diagram of a change curve of the resistance value Rbc. The horizontal axis t is time, and the vertical axis Rbc is a resistance value between the zero line of the grounding body and the grounding body; the curve (1) is a curve of Rbc along with the change of time; the curve (2) is a trend curve; the minimum value of Rbc on the variation curve refers to the valley value of Rbc in the sampling process, the valley values of Rbc are sequentially connected to obtain a trend curve, and meanwhile, the value above the trend curve is cut off (as shown by a circle part in the figure); and then calculating the slope of the trend curve in the time t, namely obtaining the slope as the variation delta Rc of the impedance of the grounding body.
S4: and if the variation delta Rc exceeds the preset impedance value, determining that the grounding body meets the preset impedance requirement.
The preset impedance value is a critical value for measuring the variation delta Rc, and can be used for judging whether the current resistance impedance of the grounding body meets the impedance requirement of the grounding body. The default of the preset impedance value is set to 10 ohms, and a user can manually modify the preset impedance value according to the field situation in the actual detection process.
Further, in an embodiment, as shown in fig. 5, before the step S1, the method further includes the following steps:
s00: and respectively acquiring voltage values between the live wire and the zero line of the grounding body and between the live wire and the ground wire of the grounding body at preset time intervals.
Specifically, a schematic diagram of obtaining the voltage value is shown in fig. 6, where a live wire of the grounding body is (a), a zero wire of the grounding body is (b), and a ground wire of the grounding body is (c); the voltage Vab between the live and neutral wires is measured first, and then the voltage Vac between the live and ground wires is measured.
S01: and if the difference value between the voltage values is smaller than the preset threshold value, determining that the grounding state of the grounding body is normal.
The preset threshold is a standard value for measuring the grounding state of the grounding body, and preferably, the preset threshold is 5V. That is, if the difference between Vab and Vac is within 5V, it means that the grounding state of the grounding body is normal.
S02: and if the difference value between the voltage values is greater than or equal to the preset threshold value, triggering abnormal warning and control output.
Taking the preset threshold value as 5V as an example, if the difference between the voltage values Vab and Vac is greater than or equal to 5V, it represents that the grounding body is not normally grounded, and this step is triggered. The abnormal warning means sending alarm information to various sound and light alarm devices to inform operation and maintenance personnel to process in time. The control output means that alarm information is sent to upper equipment of the grounding body to inform the upper equipment to respond, control the output of current and voltage and guarantee the electricity utilization safety.
In this embodiment, the voltage values between the live wire and the zero line of the grounding body and between the live wire and the ground wire of the grounding body are respectively obtained at preset time intervals, and the disconnection state of the grounding body can be judged in real time according to the magnitude relation between the difference value of the live wire and the zero line of the grounding body and the preset threshold value, so that the comprehensive and long-term monitoring of the grounding body is facilitated.
Further, in an embodiment, after the step S3, the method further includes the steps of:
and S5, if the variation delta Rc does not exceed the preset impedance value, determining that the grounding body does not meet the preset impedance requirement, and triggering abnormity warning and control output.
Taking the preset impedance value as an example of 10 ohms, if the variation Δ Rc is smaller than 10 ohms, it represents that the grounding body does not meet the preset impedance requirement, and this step is triggered to notify the operation and maintenance personnel that the grounding state of the current grounding body equipment is deteriorating, and that the grounding body equipment needs to be periodically maintained or updated in time.
Based on the trend statistical type grounding body monitoring method, the invention also provides a trend statistical type grounding body monitoring device, the trend statistical type grounding body monitoring device corresponds to the trend statistical type grounding body monitoring method one by one, the schematic diagram of each module is shown in fig. 7, and the detailed description of each module is as follows:
the sampling module 73 is used for connecting a sampling resistor in series between the zero line of the grounding body and the ground wire of the grounding body and applying a measuring voltage by using a constant-voltage direct-current power supply;
the resistance value calculating module 74 is used for measuring the voltage drop value Vs of the sampling resistor at preset time intervals, and calculating a resistance value Rbc between the zero line of the grounding body and the grounding body according to the resistance value Rs of the sampling resistor and the voltage value Vm of the measuring voltage;
the trend statistics module 75 is configured to record a variation curve of the resistance value Rbc according to a preset time interval, and calculate a variation Δ Rc of the impedance of the ground body according to the variation curve;
the grounding standard determination module 76 determines that the grounding body meets the predetermined impedance requirement if the variation Δ Rc exceeds the predetermined impedance value.
Further, trend statistics formula grounding body monitoring devices still includes:
the voltage detection module 71 is configured to obtain voltage values between a live ground line and a zero line of the ground body and between the live ground line and a ground line of the ground body, respectively;
a grounding state confirmation module 72, configured to determine that the grounding state of the grounding body is normal if the difference between the voltage values is smaller than a preset threshold;
and a first alarm module 77, configured to trigger an abnormal warning and control output if the difference between the voltage values is greater than or equal to a preset threshold.
Further, the resistance value calculation module 74 includes:
the resistance value calculation submodule 741 is configured to calculate a resistance value Rbc according to the following formula:
Rbc＝(Vm x Rs-Vs x Rs)/Vs
wherein Vm is a voltage value of the measurement voltage; rs is the resistance of the sampling resistor; vs is the voltage drop value of the sampling resistor.
Further, the trend statistics module 75 includes:
the curve calculation submodule 751 is used for connecting the minimum values of the Rbc on the change curve to obtain a trend curve;
and the slope calculation submodule 752 is configured to calculate a slope of the trend curve in the preset time interval, and use the slope as the variation Δ Rc of the impedance of the ground body.
Further, trend statistics formula grounding body monitoring devices still includes:
and a second warning module 78, configured to determine that the ground body does not meet the preset impedance requirement, and trigger an abnormal warning and control output if the variation Δ Rc does not exceed the preset impedance value.
Although the trend statistical grounding body monitoring method of the present invention has been described above for the purpose of facilitating understanding of the present invention, the embodiments of the present invention are not limited by the above-mentioned examples, and any changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit of the present invention shall be regarded as equivalent replacements, and all such changes and modifications are included within the scope of the present invention.
Claims (10)
1. A trend statistical type grounding body monitoring method is characterized by comprising the following steps:
a sampling resistor is connected in series between the zero line of the grounding body and the ground wire of the grounding body, and a constant voltage direct current power supply is used for applying a measuring voltage;
measuring a voltage drop value Vs of the sampling resistor at preset time intervals, and calculating a resistance value Rbc between the zero line of the grounding body and the grounding body according to a resistance value Rs of the sampling resistor and a voltage value Vm of the measured voltage;
recording a variation curve of the resistance value Rbc according to the preset time interval, and calculating to obtain a variation delta Rc of the impedance of the grounding body according to the variation curve;
and if the variation Δ Rc exceeds a preset impedance value, determining that the grounding body meets a preset impedance requirement.
2. The method of claim 1, wherein the method of trend statistical earth monitoring is performed before connecting a sampling resistor in series between the neutral line of the earth and the earth ground and applying the measurement voltage with a constant voltage dc power supply, further comprising:
respectively acquiring voltage values between a live wire and a zero line of a grounding body and between a live wire and a ground wire of the grounding body at preset time intervals;
if the difference value between the voltage values is smaller than a preset threshold value, determining that the grounding state of the grounding body is normal;
and if the difference value between the voltage values is greater than or equal to the preset threshold value, triggering abnormal warning and control output.
3. The trend statistical grounding body monitoring method of claim 1, wherein the resistance value Rbc is calculated according to the following formula:
Rbc＝(Vm x Rs-Vs x Rs)/Vs
wherein Vm is a voltage value of the measurement voltage; rs is the resistance value of the sampling resistor; vs is the voltage drop value of the sampling resistor.
4. The trend statistical ground body monitoring method according to claim 1, wherein the recording a variation curve of the resistance value Rbc according to the preset time interval, and calculating a variation Δ Rc of the ground body impedance according to the variation curve includes:
connecting the minimum values of Rbc on the change curve to obtain a trend curve;
and calculating the slope of the trend curve in the preset time interval, and taking the slope as the variation delta Rc of the impedance of the grounding body.
5. The method for monitoring a trend statistical type ground engaging body according to claim 1, wherein after said recording a variation curve of the resistance value Rbc according to the preset time interval and calculating a variation Δ Rc of the ground engaging body impedance according to the variation curve, the method for monitoring a trend statistical type ground engaging body further comprises:
and if the variation delta Rc does not exceed a preset impedance value, determining that the grounding body does not meet the preset impedance requirement, and triggering abnormal warning and control output.
6. The utility model provides a trend statistics formula grounding body monitoring devices which characterized in that, trend statistics formula grounding body monitoring devices includes:
the sampling module is used for serially connecting a sampling resistor between the zero line of the grounding body and the ground wire of the grounding body and applying a measuring voltage by using a constant-voltage direct-current power supply;
the resistance value calculation module is used for measuring a voltage drop value Vs of the sampling resistor at preset time intervals, and calculating a resistance value Rbc between the zero line of the grounding body and the grounding body according to a resistance value Rs of the sampling resistor and a voltage value Vm of the measuring voltage;
the trend statistical module is used for recording a variation curve of the resistance value Rbc according to the preset time interval and calculating to obtain a variation delta Rc of the impedance of the grounding body according to the variation curve;
and a grounding standard confirming module, configured to determine that the grounding body meets a preset impedance requirement if the variation Δ Rc exceeds a preset impedance value.
7. The trend statistical grounded body monitoring device of claim 6 further comprising:
the voltage detection module is used for respectively acquiring voltage values between a live wire and a zero line of the grounding body and between the live wire and a ground wire of the grounding body;
the grounding state confirmation module is used for determining that the grounding state of the grounding body is normal if the difference value between the voltage values is smaller than a preset threshold value;
and the first alarm module is used for triggering abnormal alarm and control output if the difference value between the voltage values is greater than or equal to the preset threshold value.
8. The trend statistical grounded body monitoring device of claim 6, wherein the resistance calculation module comprises:
the resistance value calculation submodule is used for calculating the resistance value Rbc according to the following formula:
Rbc＝(Vm x Rs-Vs x Rs)/Vs
wherein Vm is a voltage value of the measurement voltage; rs is the resistance value of the sampling resistor; vs is the voltage drop value of the sampling resistor.
9. The trend statistical grounding body monitoring device of claim 6, wherein the trend statistical module comprises:
the curve calculation submodule is used for connecting the minimum values of the Rbc on the change curve to obtain a trend curve;
and the slope calculation submodule is used for calculating the slope of the trend curve in the preset time interval and taking the slope as the variation delta Rc of the impedance of the grounding body.
10. The trend statistical grounded body monitoring device of claim 6 further comprising:
and the second warning module is used for determining that the grounding body does not meet the preset impedance requirement and triggering abnormal warning and control output if the variation delta Rc does not exceed the preset impedance value.
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| CN111443304A (en) * | 2020-05-08 | 2020-07-24 | 国网江苏省电力有限公司镇江供电分公司 | Ground wire state early warning device |
| WO2021237977A1 (en) * | 2020-05-26 | 2021-12-02 | 捍防（苏州）实业有限公司 | Apparatus and method for monitoring resistance between null line and ground line |
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