A method, apparatus, device, and medium for identifying hard platen return circuit voltage polarity

Abstract

This invention discloses a method, apparatus, device, and medium for identifying the voltage polarity of a hard-plate circuit, belonging to the field of power grid hard-plate status detection technology. The method includes: determining the current operating environment type after the signal acquisition part is installed; if the current operating environment of the signal acquisition part meets a first operating environment condition, analyzing whether the voltage value meets a first comparison condition, and determining the voltage polarity based on the result; if the current operating environment of the signal acquisition part meets a second operating environment condition, analyzing whether the voltage value meets a second comparison condition, and determining the voltage polarity based on the result; if the current operating environment of the signal acquisition part meets a third operating environment condition, analyzing the real-time waveform of the voltage to obtain corresponding signal points in the real-time waveform, and analyzing the signal points to determine the voltage polarity. This invention avoids the risk of violating safety regulations by selecting a suitable identification method based on the current operating environment type of the signal acquisition part, accurately identifying the voltage polarity of the current voltage.

Description

Technical Field

[0001] This invention relates to the field of power grid hard plate condition detection technology, specifically to a method, apparatus, equipment, and medium for identifying the voltage polarity of a hard plate circuit. Background Technology

[0002] Identifying the voltage polarity of a hard-plate circuit is crucial for the normal operation of related equipment and the correct operation of protection devices in a power system. Common identification methods include multimeter measurement, oscilloscope measurement, circuit analysis, and circuit connection relationship analysis.

[0003] The multimeter measurement method involves setting the multimeter to the DC voltage range and connecting the probes to both ends of the hard-plate circuit. If the measured voltage is positive, the terminal connected to the positive probe is positive and the terminal connected to the negative probe is negative; conversely, if the measured voltage is negative, the polarity is reversed.

[0004] However, using a multimeter to measure the voltage polarity of a hard-plate circuit poses a potential risk of violating safety regulations. Furthermore, the changing environment surrounding the hard-plate circuit (e.g., temperature and humidity variations, or the presence of electromagnetic interference) can lead to a high rate of misjudgment of the identified voltage polarity.

[0005] Therefore, how to address the potential risks of violating safety regulations and improve the accuracy of voltage polarity identification are urgent problems to be solved. Summary of the Invention

[0006] In view of the above-mentioned problems, the present invention provides a method, apparatus, device and medium for identifying the voltage polarity of a hard platen circuit.

[0007] Therefore, the technical problem solved by the present invention is: how to avoid the risk of violating safety regulations and select an appropriate identification method according to the current working environment type of the signal acquisition part, so as to accurately identify the voltage polarity of the hard plate circuit.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for identifying the voltage polarity of a hard-plate circuit, comprising, After the signal acquisition component is installed, the current working environment type of the signal acquisition component is determined; If the current working environment of the signal acquisition part meets the first working environment conditions, analyze whether the voltage values ​​of the hard plate circuits obtained one by one according to the preset acquisition conditions meet the first comparison conditions, determine the voltage polarity of the current voltage based on the results, and form a voltage polarity waveform that tends to a constant state. If the current working environment of the signal acquisition part meets the second working environment conditions, analyze whether the voltage values ​​of the hard plate circuit obtained one by one according to the preset acquisition conditions meet the second comparison conditions, determine the voltage polarity of the current voltage according to the results, and form a voltage polarity waveform that tends to a constant state. The second comparison conditions include at least two comparison conditions. If the current working environment of the signal acquisition part meets the third working environment condition, the real-time waveform of the voltage is analyzed to obtain the corresponding signal points in the real-time waveform of the voltage, and the signal points are analyzed to determine the voltage polarity of the current voltage.

[0009] As a preferred embodiment of the method for identifying the voltage polarity of a hard plate circuit according to the present invention, the first working environment condition is that the ambient temperature and humidity are constantly constant and there is no electromagnetic interference; the second working environment condition is that the ambient temperature and humidity are constantly changing and there is no electromagnetic interference; and the third working environment condition is that the ambient temperature and humidity are constantly changing and there is electromagnetic interference.

[0010] As a preferred embodiment of the method for identifying the voltage polarity of a hard plate circuit according to the present invention, wherein: when the ambient temperature and humidity are continuously constant and there is no electromagnetic interference, the current voltage value obtained one by one according to the preset acquisition conditions is constant; if the current voltage value is less than the reference voltage value, the voltage polarity of the current voltage is determined to be negative; otherwise, the voltage polarity of the current voltage is determined to be positive. The current voltage value forms a voltage polarity waveform that tends to be constant based on the previous voltage value.

[0011] As a preferred embodiment of the method for identifying the voltage polarity of a hard plate circuit according to the present invention, wherein: when the ambient temperature and humidity are constantly changing and there is no electromagnetic interference, the current voltage value obtained one by one according to the preset acquisition conditions is the voltage value when a jump state occurs. If the current voltage value is greater than the reference value and greater than the maximum value in the positive threshold, the voltage polarity of the current voltage is determined to be positive. The current voltage value forms a voltage polarity waveform that tends to a constant state based on the previous voltage value. Alternatively, if the current voltage value is greater than the reference value and is one of the positive threshold values, the voltage polarity of the current voltage is determined to be positive, and the current voltage value forms a voltage polarity waveform that tends to a constant state based on the previous voltage value; Alternatively, if the current voltage value is greater than the reference value and greater than each of the negative threshold values, the voltage polarity of the current voltage is determined to be positive, and the current voltage value forms a voltage polarity waveform that tends to a constant state based on the previous voltage value. Alternatively, if the current voltage value is less than the reference value and less than the minimum value among the negative thresholds, the voltage polarity of the current voltage is determined to be negative, and the current voltage value forms a voltage polarity waveform that tends to a constant state based on the previous voltage value. Alternatively, if the current voltage value is less than the reference value and is one of the negative threshold values, the voltage polarity of the current voltage is determined to be negative, and the current voltage value forms a voltage polarity waveform that tends to a constant state based on the previous voltage value.

[0012] As a preferred embodiment of the method for identifying the voltage polarity of a hard-plate circuit according to the present invention, the method includes the following steps: when the ambient temperature and humidity are constantly changing and there is electromagnetic interference, obtaining the real-time waveform of the voltage, obtaining the corresponding signal points from the real-time waveform of the voltage, and analyzing the signal points to determine the voltage polarity of the current voltage. The real-time waveform of the voltage is subjected to a moving average process to obtain a smooth voltage waveform signal; Remove noise from the smoothed voltage waveform signal; The smoothed voltage waveform signal is subjected to standardized differential signal calculation, and the first reference point in the smoothed voltage waveform signal and each current signal point located after the first reference point are obtained in sequence. Calculate the distance difference between the current signal point and the first reference point. If the distance difference meets the third comparison condition, determine the voltage polarity of the current voltage based on the analysis results.

[0013] As a preferred embodiment of the method for identifying the voltage polarity of a hard plate circuit according to the present invention, if the distance difference does not meet the third comparison condition, it indicates that the current signal point has changed, and the signal point that was previously in a constant state is selected and defined as the next reference point. Calculate the distance difference between the current signal point and the next reference point. If the distance difference meets the fourth comparison condition, determine the voltage polarity of the current voltage based on the analysis results.

[0014] As a preferred embodiment of the method for identifying the voltage polarity of a hard plate circuit according to the present invention, the method involves: analyzing the voltage polarity of the current voltage; and if it is determined that the voltage polarity of the current voltage is abnormal, then issuing an early warning.

[0015] This invention provides a device for identifying the polarity of the voltage in a hard pressure plate circuit.

[0016] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a device for identifying the voltage polarity of a hard platen circuit, comprising: an environmental monitoring sensor, a signal acquisition part, a voltage polarity analysis module, and an early warning analysis module, wherein: The environmental monitoring sensor senses temperature, humidity, and electromagnetic signals in the environment to determine the current working environment type of the signal acquisition part. The signal acquisition section senses the electric field signal generated by the DC voltage in the hard plate circuit according to the preset acquisition conditions, and obtains the corresponding voltage value and the real-time waveform of the generated voltage. The voltage polarity analysis module analyzes the current voltage value or real-time waveform of the voltage based on the current working environment type of the signal acquisition part, and determines the voltage polarity of the current voltage based on the analysis results. The early warning analysis module analyzes the voltage polarity of the current voltage. If it determines that the voltage polarity of the current voltage does not match the preset voltage polarity, it issues an early warning.

[0017] The present invention provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the method for identifying the voltage polarity of a hard plate circuit.

[0018] The present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the method for identifying the polarity of a hard platen circuit voltage.

[0019] The beneficial effects of this invention are: it eliminates the need for physical devices such as multimeters, thus avoiding the risk of violating safety regulations; By detecting the signal, we can obtain part of the current working environment type, and select a suitable identification method according to the current working environment to accurately identify the voltage polarity of the current voltage. By analyzing the voltage polarity of the current voltage, an alarm signal can be issued when the voltage polarity of the current voltage becomes abnormal, reminding maintenance personnel to handle the situation promptly. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is an overall flowchart of a method for identifying the voltage polarity of a hard platen circuit according to an embodiment of the present invention; Figure 2 The flowchart illustrates a method for identifying the polarity of a hard plate circuit voltage in an embodiment of the present invention, under conditions where the ambient temperature and humidity are constant and there is no electromagnetic interference. Figure 3 A voltage polarity waveform diagram provided in an embodiment of the present invention for a method for identifying the voltage polarity of a hard plate circuit in an environment where the temperature and humidity are constant and there is no electromagnetic interference; Figure 4 A flowchart illustrating the identification process for identifying the voltage polarity of a hard platen circuit according to an embodiment of the present invention, under conditions of changing ambient temperature and humidity and no electromagnetic interference. Figure 5 A voltage polarity waveform diagram in a state where the ambient temperature and humidity are constantly changing and there is no electromagnetic interference, provided as an embodiment of the present invention, for a method of identifying the voltage polarity of a hard plate circuit; Figure 6 The flowchart of the identification process in a method for identifying the voltage polarity of a hard plate circuit provided in an embodiment of the present invention when the ambient temperature and humidity are constantly changing and there is electromagnetic interference. Figure 7 This is a flowchart illustrating a method for identifying the voltage polarity of a hard platen circuit according to an embodiment of the present invention, when the ambient temperature and humidity are changing and there is electromagnetic interference. Figure 8 A method for identifying the voltage polarity of a hard platen circuit, as provided in one embodiment of the present invention, generates a voltage waveform after moving average processing; Figure 9 This is an overall structural diagram of a device for identifying the polarity of a hard platen circuit voltage according to an embodiment of the present invention; Figure 10 This is a schematic diagram showing the connection between the signal acquisition part and the cable in a method for identifying the voltage polarity of a hard platen circuit according to an embodiment of the present invention; Figure 11 A flowchart of an early warning method in a method for identifying the voltage polarity of a hard platen circuit according to an embodiment of the present invention; Figure 12 This is a schematic block diagram of an early warning device in a method for identifying the voltage polarity of a hard platen circuit according to an embodiment of the present invention; Figure 13 This is a schematic diagram of an electronic device in a method for identifying the voltage polarity of a hard platen circuit, provided as an embodiment of the present invention.

[0022] In the diagram: 1. Environmental monitoring sensor; 2. Signal acquisition section; 3. Voltage polarity analysis module; 4. Early warning analysis module; 5. Communication interface; 6. Processor; 7. Memory; 8. Bus system; 9. Cable. Detailed Implementation

[0023] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0024] Example 1, referring to Figure 1 This is one embodiment of the present invention, which provides a method for identifying the voltage polarity of a hard-plate circuit, comprising: Install the signal acquisition section on the hardened pressure plate circuit; Determine the current working environment type of the signal acquisition section; If the current working environment of the signal acquisition part meets the first working environment condition, analyze whether the voltage value of the hard plate circuit obtained one by one according to the preset acquisition conditions meets the first comparison condition, determine the voltage polarity of the current voltage based on the result, and form a voltage polarity waveform that tends to a constant state. If the current working environment of the signal acquisition part meets the second working environment conditions, analyze whether the voltage values ​​of the hard plate circuit obtained one by one according to the preset acquisition conditions meet the second comparison conditions, determine the voltage polarity of the current voltage based on the results, and form a voltage polarity waveform that tends to a constant state. The second comparison conditions include at least two comparison conditions. If the current working environment of the signal acquisition part meets the third working environment condition, analyze the real-time waveform of the voltage to obtain the corresponding signal points in the real-time waveform of the voltage, and analyze the signal points to determine the voltage polarity of the current voltage.

[0025] In this embodiment, the signal acquisition section includes an electric field coupling sensor and a signal conditioning module. The electric field coupling sensor senses the electric field distribution around the hard plate circuit through the principle of electric field coupling, and can accurately sense the electric field signal generated by the DC voltage. The signal conditioning module amplifies, filters, and performs analog-to-digital conversion on the weak electric field signal collected by the electric field coupling sensor, extracts effective voltage polarity features, and thus obtains the current voltage value and the real-time waveform of the generated voltage.

[0026] The first working environment condition is that the temperature and humidity of the current working environment are constantly constant and there is no electromagnetic interference.

[0027] The second working environment condition is that the temperature and humidity of the current working environment are constantly changing and there is no electromagnetic interference.

[0028] The third working environment condition is that the temperature and humidity of the current working environment are constantly changing and there is electromagnetic interference.

[0029] In this invention, the current working environment type is obtained by detecting the signal, and a suitable identification method can be selected according to the current working environment to accurately identify the voltage polarity of the current voltage.

[0030] Example 2, refer to Figures 2-3 This is one embodiment of the present invention, which provides a method for identifying the voltage polarity of a hard-plate circuit, comprising: Step 201: After the signal acquisition section is installed, ensure that the temperature and humidity of the current working environment remain constant and free from electromagnetic interference. Step 202: Obtain each current voltage value one by one according to the preset acquisition conditions; Step 203: Analyze whether the current voltage value is less than the reference voltage value one by one; Step 204: If the current voltage value is greater than or equal to the reference voltage value, determine that the voltage polarity of the current voltage is positive. Step 205: If the current voltage value is less than the reference voltage value, determine that the voltage polarity of the current voltage is negative. Step 206: The current voltage value forms a voltage polarity waveform that tends to be constant based on the previous voltage value.

[0031] Specifically, in step 201, after the signal acquisition part is installed, the temperature and humidity sensor and the electromagnetic interference signal monitoring device collect the temperature, humidity and electromagnetic interference signals in the current working environment in real time.

[0032] Furthermore, the temperature and humidity sensor analyzes the temperature and humidity of the sensing area, and the electromagnetic interference signal monitoring device monitors the electromagnetic interference signal of the sensing area. If the temperature and humidity remain constant and there is no electromagnetic interference during the temperature and humidity acquisition period, then the current working environment is determined to meet the first working environment conditions.

[0033] Specifically, in step 202, the signal acquisition section obtains the voltage value of the hard plate circuit one by one according to the preset acquisition conditions. Since the temperature and humidity of the current working environment are constantly constant and there is no electromagnetic interference, the current voltage value obtained by the signal acquisition section is a constant value.

[0034] Furthermore, the signal acquisition section includes an electric field coupling sensor and a signal conditioning module. The electric field coupling sensor senses the electric field distribution around the hard platen circuit through the principle of electric field coupling, accurately sensing the electric field signal generated by the DC voltage while suppressing external interference. The signal conditioning module amplifies, filters, and performs analog-to-digital conversion on the weak electric field signal acquired by the electric field coupling sensor, extracting effective voltage polarity characteristics to obtain the current voltage value and the real-time waveform of the generated voltage.

[0035] Furthermore, the electric field coupling sensor includes sensing electrodes, a shielding layer, and signal conditioning circuitry. The signal conditioning module includes a high-precision amplifier, a low-pass filter, and a high-speed ADC.

[0036] For example, the signal acquisition unit senses the electric field signal generated by the DC voltage once according to a preset acquisition condition of 1 time / 5 seconds, thereby obtaining the current voltage value corresponding to the electric field signal. Specifically, the signal acquisition unit defines the first obtained current voltage value as the reference voltage value V0, and defines each voltage value obtained after the reference voltage value V0 according to the preset acquisition condition of 1 time / 5 seconds as the current voltage value (i.e., V1, V2...V...). N ).

[0037] Specifically, in step 203, each current voltage value is compared with a reference voltage value according to the order in which the current voltage values ​​are obtained, and it is determined whether the current voltage value is less than the reference voltage value (i.e., the first comparison condition).

[0038] In step 204, for example, the reference voltage value V0 is set to 1V and the current voltage value V1 is 160V. After comparison, the current voltage value V1 is greater than the reference voltage value V0, and the voltage polarity of the current voltage value V1 is determined to be positive.

[0039] The reference voltage value V0 is set to 1V, and the current voltage value V2 is 50V. After comparison, the current voltage value V0 is greater than the reference voltage value V0, and the voltage polarity of the current voltage value V2 is determined to be positive.

[0040] In step 205, for example, the reference voltage value V0 is set to 1V, and the current voltage value V3 is -160V. After comparison, the current voltage value V3 is less than the reference voltage value V0, and the voltage polarity of the current voltage value V3 is determined to be negative. The current voltage value V4 is -50V. After comparison, the current voltage value V4 is less than the reference voltage value V0, and the voltage polarity of the current voltage value V4 is determined to be negative.

[0041] like Figure 3 As shown, specifically, in step 206, the reference voltage value V0 is less than the current voltage value V1. Therefore, in the voltage polarity waveform that tends to a constant state, the current voltage value V1 is the upper edge of the reference voltage value V0. At this time, the reference voltage value V0 can be understood as the previous voltage value of the current voltage value V1 (i.e., the previous voltage value V0).

[0042] The current voltage value V2 is less than the previous voltage value V1. Therefore, in the voltage polarity waveform that tends to be constant, the current voltage value V2 is the lower edge of the previous voltage value V1.

[0043] The current voltage value V3 is less than the previous voltage value V2. Therefore, in the voltage polarity waveform that tends to be constant, the current voltage value V3 is the lower edge of the previous voltage value V2.

[0044] The current voltage value V4 is greater than the previous voltage value V3. Therefore, in the voltage polarity waveform that tends to be constant, the current voltage value V4 is the upper edge of the previous voltage value V3.

[0045] From the voltage polarity waveform that tends to a constant state, it can be seen that the current voltage polarity of voltage values ​​V1 and V2 is positive, while the current voltage polarity of voltage values ​​V3 and V4 is negative.

[0046] Example 3, referring to Figures 4-5 This is one embodiment of the present invention, which provides a method for identifying the voltage polarity of a hard-plate circuit, comprising: Step 401: After the signal acquisition section is installed, determine that the temperature and humidity of the current working environment are changing and there is no electromagnetic interference. Step 402: Obtain each current voltage value one by one according to the preset acquisition conditions; Step 403: Analyze whether the current voltage value simultaneously meets the two comparison conditions; Step 404: Determine whether the current voltage polarity is positive or negative based on the analysis results; Step 405: The current voltage value forms a voltage polarity waveform that tends to be constant based on the previous voltage value.

[0047] Specifically, in step 401, after the signal acquisition part is installed, the temperature and humidity sensor and the electromagnetic interference signal monitoring device collect the temperature, humidity and electromagnetic interference signals in the current working environment in real time.

[0048] Furthermore, the temperature and humidity sensor analyzes the temperature and humidity of the sensing area, and the electromagnetic interference signal monitoring device monitors the electromagnetic interference signal of the sensing area. If the temperature and humidity continue to change during the temperature and humidity acquisition period and there is no electromagnetic interference, then it is determined that the current working environment meets the second working environment conditions.

[0049] Specifically, in step 402, the signal acquisition section obtains the voltage value of the hard plate circuit one by one according to the preset acquisition conditions. Since the temperature and humidity of the current working environment are constantly changing and there is no electromagnetic interference, the current voltage value obtained by the signal acquisition section is the voltage value when the jump state occurs.

[0050] Furthermore, the signal acquisition section includes an electric field coupling sensor and a signal conditioning module. The electric field coupling sensor senses the electric field distribution around the hard platen circuit through the principle of electric field coupling, accurately sensing the electric field signal generated by the DC voltage while suppressing external interference. The signal conditioning module amplifies, filters, and performs analog-to-digital conversion on the weak electric field signal acquired by the electric field coupling sensor, extracting effective voltage polarity characteristics to obtain the current voltage value and the real-time waveform of the generated voltage.

[0051] Furthermore, the electric field coupling sensor includes sensing electrodes, a shielding layer, and signal conditioning circuitry. The signal conditioning module includes a high-precision amplifier, a low-pass filter, and a high-speed ADC.

[0052] For example, the signal acquisition unit senses the electric field signal generated by the DC voltage once according to a preset acquisition condition of 1 time / 5 seconds, thereby obtaining the current voltage value corresponding to the electric field signal. Specifically, the signal acquisition unit defines the first obtained current voltage value as the reference voltage value V0, and defines each voltage value obtained after the reference voltage value V0 according to the preset acquisition condition of 1 time / 5 seconds as the current voltage value (i.e., V1, V2...V...). N ).

[0053] Specifically, in step 403, at least two comparison conditions include: determining whether the current voltage value is greater than the reference voltage value and whether it is greater than the maximum value among the positive thresholds; or determining whether the current voltage value is greater than the reference voltage value and whether it is a value among the positive thresholds; or determining whether the current voltage value is greater than the reference voltage value and whether it is greater than each value among the negative thresholds; or determining whether the current voltage value is less than the reference voltage value and whether it is less than the minimum value among the negative thresholds; or determining whether the current voltage value is less than the reference voltage value and whether it is a value among the negative thresholds.

[0054] For example, a positive threshold is set to 0V~110V, a negative threshold is set to -110V~0V, a reference voltage value V0 is 1V, and a current voltage value V1 is 160V. After comparison, the current voltage value V1 is greater than the reference voltage value V0. At the same time, the current voltage value V1 is greater than each value in the positive threshold.

[0055] The current voltage value V2 is 50V. After comparison, the current voltage value V2 is greater than the reference voltage value V0. At the same time, the current voltage value V1 is one of the positive threshold values.

[0056] The current voltage value V3 is 40V. After comparison, the current voltage value V3 is greater than the reference voltage value V0. At the same time, the current voltage value V3 is greater than each value in the negative threshold.

[0057] The current voltage value V4 is -160V. After comparison, the current voltage value V4 is less than the reference voltage value V0. At the same time, the current voltage value V4 is less than each value in the negative threshold.

[0058] The current voltage value V5 is -50V. After comparison, the current voltage value V5 is less than the reference voltage value V0. At the same time, the current voltage value V5 is one of the negative threshold values.

[0059] In step 404, for example, based on the analysis results of step 403, it is determined that the current voltage polarity of the current voltage values ​​V1, V2 and V3 are all positive, and the current voltage polarity of the current voltage values ​​V4 and V5 are both negative.

[0060] like Figure 5 As shown, in step 405, for example, the reference voltage value V0 is less than the current voltage value V1. Therefore, in the voltage polarity waveform that tends to a constant state, the current voltage value V1 is the upper edge of the reference voltage value V0. At this time, the reference voltage value V0 can be understood as the previous voltage value of the current voltage value V1 (i.e., the previous voltage value V0).

[0061] The current voltage value V2 is less than the previous voltage value V1. Therefore, in the voltage polarity waveform that tends to be constant, the current voltage value V2 is the lower edge of the previous voltage value V1.

[0062] The current voltage value V3 is less than the previous voltage value V2. Therefore, in the voltage polarity waveform that tends to be constant, the current voltage value V3 is the lower edge of the previous voltage value V2.

[0063] The current voltage value V4 is less than the previous voltage value V3. Therefore, in the voltage polarity waveform that tends to be constant, the current voltage value V4 is the lower edge of the previous voltage value V3.

[0064] The current voltage value V5 is greater than the previous voltage value V4. Therefore, in the voltage polarity waveform that tends to be constant, the current voltage value V5 is the upper edge of the previous voltage value V4.

[0065] From the voltage polarity waveform that tends to a constant state, it can be seen that the current voltage polarity of voltage values ​​V1, V2 and V3 is positive, while the current voltage polarity of voltage values ​​V4 and V5 is negative.

[0066] Example 4, refer to Figure 6 This is one embodiment of the present invention, which provides a method for identifying the voltage polarity of a hard-plate circuit, comprising: Step 601: After the signal acquisition section is installed, determine that the temperature and humidity of the current working environment are constantly changing and there is electromagnetic interference. Step 602: Obtain the real-time waveform of the voltage; Step 603: Perform a moving average process on the real-time voltage waveform to obtain a smooth voltage waveform signal; Step 604: Remove noise from the smoothed voltage waveform signal; Step 605: Perform standardized differential signal calculation on the smoothed voltage waveform signal to obtain each signal point in the smoothed voltage waveform signal; Step 606: Analyze whether each signal point meets the third comparison condition, and determine the voltage polarity of the current voltage based on the results.

[0067] Specifically, in step 601, after the signal acquisition part is installed, the temperature and humidity sensor and the electromagnetic interference signal monitoring device collect the temperature, humidity and electromagnetic interference signals in the current working environment in real time.

[0068] Furthermore, the temperature and humidity sensor analyzes the temperature and humidity of the sensing area, and the electromagnetic interference signal monitoring device monitors the electromagnetic interference signal of the sensing area. If the temperature and humidity are constantly changing and there is electromagnetic interference during the temperature and humidity acquisition period, then it is determined that the current working environment meets the third working environment condition.

[0069] Specifically, in step 603, the real-time voltage waveform is subjected to a moving average process to obtain a smoothed voltage waveform signal, represented as follows: in, It is a simple moving average. These are all voltage values. Let M be the sum of the voltage values, and M be the number of voltage values.

[0070] Applying a moving average to the real-time voltage waveform can eliminate high-frequency noise, making the signal smoother and the periodic trend of the real-time voltage waveform more obvious. This improves the quality and reliability of the real-time voltage waveform, facilitating subsequent analysis or model training.

[0071] Specifically, in step 604, wavelet denoising method is used to remove noise from the smoothed voltage waveform signal.

[0072] Among them, wavelet denoising for smooth voltage waveform signals is expressed as: in, These are the denoised coefficients. Let be the wavelet coefficients at time t. The threshold parameter is denoted by , and sign(f(t)) is the sign function (taking the positive or negative sign).

[0073] Threshold parameter The value selection involves first estimating the noise intensity, and then calculating the threshold according to the rules, specifically including the following steps: Step 1: Perform wavelet decomposition on the noisy signal to obtain high-frequency detail coefficients; use the median estimation method or the energy leakage correction method, and use the statistical characteristics of the high-frequency coefficients to estimate the noise intensity.

[0074] Step 2: Substitute the estimated noise intensity from the characteristic estimation into the general threshold formula: in, For threshold parameters, This is the standard deviation of the noise (i.e., the estimated noise intensity based on the characteristic estimate). Let N be the natural logarithm function, and N be the length of the signal. It is a gradual adjustment factor.

[0075] Step 603 can quickly suppress noise in the smoothed voltage waveform signal, thus achieving the purpose of noise removal.

[0076] Specifically, in step 605, the smoothed voltage waveform signal after noise removal is set to include k sampling points. The standardized differential signal calculation of the smoothed voltage waveform signal after noise removal includes the following steps: The first-order difference of the smoothed voltage waveform signal after noise removal is calculated and expressed as: in, The difference value, The smoothed signal value at the k-th sampling point. For the first The smoothed signal value of each sampling point.

[0077] The mean of the differentiated signal is calculated as follows: in, The sample mean of the differential signal. This is the normalization factor used to sum and average N difference signals. The subscripts are used for discrete summation, and the summation is performed point by point from point 1 to point N. This is to sum over all N differential signal values.

[0078] The standard deviation of the differential signal is calculated using the following steps: Calculate the squared deviation of each difference value from the mean, expressed as: in, The difference value, μ The sample mean of the differential signal. This represents the squared deviation of each difference from the mean, used to calculate variance or standard deviation.

[0079] The variance of the sum of squared deviations is expressed as: in, The variance of the differential signal measures the magnitude of fluctuation. The difference value, μ Let A be the sample mean of the differential signal, and A be the total number of points in the differential signal. To obtain the average normalization coefficient, The subscript is used for discrete summation.

[0080] The standard deviation is obtained by taking the square root, and is expressed as: in, The standard deviation of the differential signal. The standard deviation can be obtained by taking the square root of the variance of the differential signal.

[0081] Specifically, in step 606, after obtaining the first reference point and the current signal point, the distance difference between the current signal point and the first reference point is calculated, and it is determined whether the distance difference is a value of the positive distance threshold (the positive distance threshold represents the threshold range of the distance difference, while the positive threshold mentioned above represents the threshold range of the voltage value. The two are different, and the positive distance threshold is a value defined in advance) (i.e., the third comparison condition). If it is determined that the distance difference is a value of the positive distance threshold, the voltage polarity of the current signal point is determined to be positive.

[0082] For example, step 605 is set to obtain k' signal points corresponding to k sampling points, the first reference point (i.e., the first signal point) is defined as k'0, the current signal point is defined as k'1, and the numerical range of the distance to the positive threshold is defined as 1-200. Figure 3 or Figure 5 In the voltage phase diagram, the first reference point k0 (e.g., Figure 3 or Figure 5 The reference voltage value V0) and the current signal point k1 (e.g., Figure 3 or Figure 5 If the current voltage value V1 is positive, and the voltage value of the current signal point k1 is greater than the voltage value of the first reference point k0, after obtaining the positive difference between the two voltage values ​​(i.e., the distance difference), the positive difference is determined to be one of the positive distance thresholds. At this time, the voltage polarity of the current signal point is determined to be positive.

[0083] Example 5, refer to Figure 7 and Figure 8This is one embodiment of the present invention, which provides a method for identifying the voltage polarity of a hard-plate circuit, comprising: Step 701: After the signal acquisition section is installed, determine that the temperature and humidity of the current working environment are constantly changing and there is electromagnetic interference. Step 702: Obtain the real-time waveform of the voltage; Step 703: Perform a moving average process on the real-time voltage waveform to obtain a smooth voltage waveform signal; Step 704: Remove noise from the smoothed voltage waveform signal; Step 705: Perform standardized differential signal calculation on the smoothed voltage waveform signal to obtain each signal point in the smoothed voltage waveform signal; Step 706: Calculate the distance difference between the current signal point and the first reference point; Step 707: Analyze whether the distance difference meets the third comparison condition; Step 708: When the third comparison condition is met, the voltage polarity of the current voltage is positive. Step 709: If the third comparison condition is not met, redefine the benchmark point; Step 710: Calculate the distance difference between the current signal point and the next reference point; Step 711: When the distance difference meets the fourth comparison condition, determine that the voltage polarity of the current voltage is negative.

[0084] Specifically, the moving average processing is as follows: Figure 8 As shown; the implementation steps of steps 701 to 708 are the same as those of steps 601 to 606.

[0085] Specifically, in step 709, when the distance difference does not meet the third comparison condition, it indicates that the current signal point has changed. At this time, it is necessary to reselect the signal point that was previously in a constant state and define it as the next reference point.

[0086] For example, the distance difference between each signal point before the current signal point and the first reference point is analyzed. If the distance difference between the three adjacent current signal points is close (e.g., the difference between the three adjacent distance differences is one of the difference thresholds), the last of the three adjacent current signal points is defined as the next reference point.

[0087] Specifically, in step 710, the distance difference between the current signal point and the first reference point is calculated.

[0088] Specifically, in step 711, it is determined whether the distance difference is one of the negative distance thresholds (i.e., the fourth comparison condition). If the distance difference is determined to be one of the negative distance thresholds (the negative distance threshold represents the threshold range of the distance difference, while the negative threshold mentioned above represents the threshold range of the voltage value. The two are different, and the negative distance threshold is predefined), then the voltage polarity of the current signal point is determined to be negative.

[0089] The identification method can accurately identify the voltage polarity of each signal point in the real-time voltage waveform.

[0090] Example 6, refer to Figures 9-10 This is one embodiment of the present invention, which provides a device for identifying the polarity of the voltage in a hard-plate circuit, comprising: The method for implementing Embodiments 1 to 5 above includes an environmental monitoring sensor 1, a signal acquisition unit 2, and a voltage polarity analysis module 3, wherein: Environmental monitoring sensor 1 senses temperature, humidity and electromagnetic signals in the environment to determine the current working environment type of signal acquisition part 2; Signal acquisition section 2 senses the electric field signal generated by the DC voltage in the hard plate circuit according to the preset acquisition conditions, and obtains the corresponding voltage value and the real-time waveform of the generated voltage. The voltage polarity analysis module 3 analyzes the current voltage value or real-time waveform based on the current working environment type of the signal acquisition part 2, and determines the voltage polarity of the current voltage based on the analysis results.

[0091] Specifically, the environmental monitoring sensor 1 includes a temperature and humidity sensor and an electromagnetic interference signal monitoring device.

[0092] The temperature and humidity sensor analyzes the sensed temperature and humidity. If the temperature and humidity remain constant during the acquisition period, it indicates that the temperature and humidity of the current working environment are constantly changing. Otherwise, it indicates that the temperature and humidity of the current working environment are constantly changing.

[0093] If the electromagnetic interference signal monitoring device does not detect any electromagnetic interference signal, it is determined that there is no electromagnetic interference in the current working environment. If the electromagnetic interference signal monitoring device detects an electromagnetic interference signal, it is determined that electromagnetic interference exists in the current working environment.

[0094] Specifically, the signal acquisition section 2 obtains the voltage value of the hard plate circuit one by one according to the preset acquisition conditions. Since the current working environment temperature and humidity are constantly constant and there is no electromagnetic interference, the current voltage value obtained by the signal acquisition section 2 is the voltage value in the non-jumping state.

[0095] Furthermore, when a portion of the cable 9 is placed inside the signal acquisition section 2, the signal acquisition section 2 collects the electric field signal generated on the cable 9, and after conversion, converts the electric field signal into a corresponding voltage value.

[0096] Furthermore, the signal acquisition section 2 includes an electric field coupling sensor and a signal conditioning module. The electric field coupling sensor senses the electric field distribution around the hard platen circuit through the principle of electric field coupling, accurately sensing the electric field signal generated by the DC voltage while suppressing external interference. The signal conditioning module amplifies, filters, and performs analog-to-digital conversion on the weak electric field signal acquired by the electric field coupling sensor, extracting effective voltage polarity characteristics to obtain the current voltage value and the real-time waveform of the generated voltage.

[0097] Preferably, the electric field coupling sensor includes a sensing electrode, a shielding layer, and a signal conditioning circuit. The signal conditioning module includes a high-precision amplifier, a low-pass filter, and a high-speed ADC.

[0098] Specifically, the voltage polarity analysis module 3 executes the voltage polarity analysis method in steps 203 to 206, or executes the voltage polarity analysis method in steps 403 to 405, or executes the voltage polarity analysis method in steps 603 to 606, or executes the voltage polarity analysis method in steps 703 to 711, thereby determining the voltage polarity of the current voltage.

[0099] Example 7, referring to Figure 11 This embodiment provides an early warning method, including the following steps: Step 901: After the signal acquisition part is installed, determine the current working environment type of the signal acquisition part; Step 902: Obtain each current voltage value and the real-time waveform of the generated voltage one by one according to the preset acquisition conditions; Step 903: Identify each current voltage value or the real-time waveform of the voltage to determine the voltage polarity of the current voltage; Step 904: Analyze the voltage polarity of the current voltage. If it is determined that the voltage polarity of the current voltage is abnormal, then issue an early warning.

[0100] Specifically, in step 901, the operation steps of steps 201, 401, 601, or 701 can be executed to determine the type of the current working environment.

[0101] Specifically, in step 902, the operation steps of steps 202, 402, 602, or 702 can be executed to obtain each current voltage value and the real-time waveform of the generated voltage one by one.

[0102] Specifically, in step 903, the voltage polarity analysis method in steps 203 to 206, or the voltage polarity analysis method in steps 403 to 405, or the voltage polarity analysis method in steps 603 to 606, or the voltage polarity analysis method in steps 703 to 711 can be executed to determine the voltage polarity of the current voltage.

[0103] In step 904, for example, the required current voltage is set to be positive. When it is determined that the current voltage polarity is negative, it is determined that it does not conform to the set voltage polarity of the current voltage. If the voltage polarity of the current voltage is abnormal, an alarm signal is issued to remind the maintenance personnel to handle it in time.

[0104] Example 8, referring to Figure 12 This embodiment provides an early warning device, including an environmental monitoring sensor 1, a signal acquisition unit 2, a voltage polarity analysis module 3, and an early warning analysis module 4, wherein: Environmental monitoring sensor 1 senses temperature, humidity and electromagnetic signals in the environment to determine the current working environment type of signal acquisition part 2; Signal acquisition section 2 senses the electric field signal generated by the DC voltage in the hard plate circuit according to the preset acquisition conditions, and obtains the corresponding voltage value and the real-time waveform of the generated voltage. The voltage polarity analysis module 3 analyzes the current voltage value or real-time waveform of the voltage based on the current working environment type of the signal acquisition part 2, and determines the voltage polarity of the current voltage based on the analysis results. The early warning analysis module 4 analyzes the voltage polarity of the current voltage. If it determines that the voltage polarity of the current voltage does not match the preset voltage polarity, an early warning is issued.

[0105] Specifically, the structure and implementation method of the environmental monitoring sensor 1 are the same as those of the environmental monitoring sensor 1, in order to determine the type of the current working environment.

[0106] Specifically, the structure and function of the signal acquisition section 2 are the same as those of the signal acquisition section 2, in order to acquire each current voltage value and the real-time waveform of the generated voltage one by one.

[0107] Specifically, the implementation of voltage polarity analysis module 3 is the same as that of voltage polarity analysis module 3, thereby determining the voltage polarity of the current voltage.

[0108] Specifically, the early warning analysis module 4 executes step 904, and when it determines that the voltage polarity of the current voltage is abnormal, it issues an alarm signal to remind maintenance personnel to handle it in a timely manner.

[0109] Example 9, referring to Figure 13This embodiment provides an electronic device, including: a communication interface 5, which can interact with other devices such as network devices; Processor 6, connected to communication interface 5, enables information exchange with other devices and performs the aforementioned actions when running computer programs. Figure 1 , Figure 2 , Figure 4 , Figure 6 or Figure 7 The steps in the method for identifying the voltage polarity of the hard plate circuit described in the document are stored in memory 7.

[0110] Of course, in practical applications, the various components in an electronic device are coupled together through the bus system 8. It can be understood that the bus system 8 is used to achieve communication and connection between these components. In addition to the data bus, the bus system 8 also includes a power bus, a control bus, and a status signal bus.

[0111] The memory 7 in this embodiment is used to store various types of data to support the operation of the electronic device. Examples of such data include any computer program used to operate on the electronic device.

[0112] It is understood that memory 7 can be volatile memory or non-volatile memory, or both. Non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), ferromagnetic random access memory (FRAM), flash memory, magnetic surface memory, optical disc, or compact disc read-only memory (CD-ROM); magnetic surface memory can be disk storage or magnetic tape storage. Volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Synchronous Static Random Access Memory (SSRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM), SyncLink Dynamic Random Access Memory (SLDRAM), and Direct Rambus Random Access Memory (DRRAM).The memory 7 described in the embodiments of this application is intended to include, but is not limited to, these and any other suitable types of memory.

[0113] The methods disclosed in the embodiments of this application can be applied to processor 6, or implemented by processor 6. Processor 6 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware in processor 6 or by instructions in software form. The processor 6 may be a general-purpose processor, DSP, or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Processor 6 can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the methods disclosed in the embodiments of this application can be directly manifested as being executed by a hardware code processor, or being executed by a combination of hardware and software modules in the code processor. The software modules may be located in a storage medium, which is located in memory 7. Processor 6 reads the program in memory 7 and combines it with its hardware to complete the steps of the aforementioned method.

[0114] When processor 6 executes the program, it implements the corresponding processes in the various methods of the above embodiments of this application. For the sake of brevity, these will not be described in detail here.

[0115] Example 10, referring to Figure 13 This invention provides a medium, namely a computer storage medium, specifically a computer-readable storage medium, including a memory 7 storing a computer program, which can be executed by a processor 6 to complete the steps in the method for identifying the voltage polarity of a hard-plate circuit. The computer-readable storage medium can be a memory such as FRAM, ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface memory, optical disc, or CD-ROM.

[0116] Those skilled in the art will understand that all or part of the steps of the above method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium, and when the program is executed, it performs the above... Figure 1 , Figure 2 , Figure 4 , Figure 6 or Figure 7 The steps in the method for identifying the voltage polarity of the hard platen circuit described herein; and the aforementioned storage medium includes various media capable of storing program code, such as mobile storage devices, ROM, RAM, magnetic disks or optical disks.

[0117] Alternatively, if the integrated units described above are implemented as software functional modules and sold or used as independent products, they can also be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of this application, or the parts that contribute to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause an electronic device (which may be a personal computer, server, network device, etc.) to execute all or part of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as mobile storage devices, ROM, RAM, magnetic disks, or optical disks.

[0118] The above description is merely a preferred embodiment of the present invention and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, all of which will fall within the protection scope of the present invention.

Claims

1. A method for identifying the voltage polarity of a hard-plate circuit, characterized in that: include, After the signal acquisition component is installed, the current working environment type of the signal acquisition component is determined; If the current working environment of the signal acquisition part meets the first working environment conditions, analyze whether the voltage values ​​of the hard plate circuits obtained one by one according to the preset acquisition conditions meet the first comparison conditions, determine the voltage polarity of the current voltage based on the results, and form a voltage polarity waveform that tends to a constant state. If the current working environment of the signal acquisition part meets the second working environment conditions, analyze whether the voltage values ​​of the hard plate circuit obtained one by one according to the preset acquisition conditions meet the second comparison conditions, determine the voltage polarity of the current voltage according to the results, and form a voltage polarity waveform that tends to a constant state. The second comparison conditions include at least two comparison conditions. If the current working environment of the signal acquisition part meets the third working environment condition, the real-time waveform of the voltage is analyzed to obtain the corresponding signal points in the real-time waveform of the voltage, and the signal points are analyzed to determine the voltage polarity of the current voltage.

2. The method for identifying the voltage polarity of a hard-plate circuit as described in claim 1, characterized in that: The first working environment condition is that the ambient temperature and humidity are constantly constant and there is no electromagnetic interference. The second working environment condition is that the ambient temperature and humidity are constantly changing and there is no electromagnetic interference. The third working environment condition is that the ambient temperature and humidity are constantly changing and there is electromagnetic interference.

3. The method for identifying the voltage polarity of a hard-plate circuit as described in claim 2, characterized in that: When the ambient temperature and humidity remain constant and there is no electromagnetic interference, the current voltage value obtained one by one according to the preset acquisition conditions is constant. If the current voltage value is less than the reference voltage value, the voltage polarity of the current voltage is determined to be negative; otherwise, the voltage polarity of the current voltage is determined to be positive. The current voltage value forms a voltage polarity waveform that tends to be constant based on the previous voltage value.

4. The method for identifying the voltage polarity of a hard-plate circuit as described in claim 3, characterized in that: When the ambient temperature and humidity are changing and there is no electromagnetic interference, the current voltage value obtained one by one according to the preset acquisition conditions is the voltage value when a jump state occurs. If the current voltage value is greater than the reference value and greater than the maximum value in the positive threshold, the voltage polarity of the current voltage is determined to be positive. The current voltage value forms a voltage polarity waveform that tends to a constant state based on the previous voltage value. Alternatively, if the current voltage value is greater than the reference value and is one of the positive threshold values, the voltage polarity of the current voltage is determined to be positive, and the current voltage value forms a voltage polarity waveform that tends to a constant state based on the previous voltage value; Alternatively, if the current voltage value is greater than the reference value and greater than each of the negative threshold values, the voltage polarity of the current voltage is determined to be positive, and the current voltage value forms a voltage polarity waveform that tends to a constant state based on the previous voltage value. Alternatively, if the current voltage value is less than the reference value and less than the minimum value among the negative thresholds, the voltage polarity of the current voltage is determined to be negative, and the current voltage value forms a voltage polarity waveform that tends to a constant state based on the previous voltage value. Alternatively, if the current voltage value is less than the reference value and is one of the negative threshold values, the voltage polarity of the current voltage is determined to be negative, and the current voltage value forms a voltage polarity waveform that tends to a constant state based on the previous voltage value.

5. The method for identifying the voltage polarity of a hard-plate circuit as described in claim 4, characterized in that: When the ambient temperature and humidity are constantly changing and there is electromagnetic interference, the real-time waveform of the voltage is obtained, and the corresponding signal points are obtained from the real-time waveform of the voltage. The signal points are analyzed to determine the voltage polarity of the current voltage, including the following steps: The real-time waveform of the voltage is subjected to a moving average process to obtain a smooth voltage waveform signal; Remove noise from the smoothed voltage waveform signal; The smoothed voltage waveform signal is subjected to standardized differential signal calculation, and the first reference point in the smoothed voltage waveform signal and each current signal point located after the first reference point are obtained in sequence. Calculate the distance difference between the current signal point and the first reference point. If the distance difference meets the third comparison condition, determine the voltage polarity of the current voltage based on the analysis results.

6. The method for identifying the voltage polarity of a hard-plate circuit as described in claim 5, characterized in that: If the distance difference does not meet the third comparison condition, it indicates that the current signal point has changed. Select the signal point that was previously in a constant state and define it as the next reference point. Calculate the distance difference between the current signal point and the next reference point. If the distance difference meets the fourth comparison condition, determine the voltage polarity of the current voltage based on the analysis results.

7. The method for identifying the voltage polarity of a hard-plate circuit as described in claim 6, characterized in that: Analyze the voltage polarity of the current voltage. If it is determined that the voltage polarity of the current voltage is abnormal, an early warning will be issued.

8. A device for identifying the voltage polarity of a hard-plate circuit, comprising the method for identifying the voltage polarity of a hard-plate circuit as described in any one of claims 1 to 7, characterized in that, include: The system comprises an environmental monitoring sensor, a signal acquisition section, a voltage polarity analysis module, and an early warning analysis module, among which: The environmental monitoring sensor senses temperature, humidity, and electromagnetic signals in the environment to determine the current working environment type of the signal acquisition part. The signal acquisition section senses the electric field signal generated by the DC voltage in the hard plate circuit according to the preset acquisition conditions, and obtains the corresponding voltage value and the real-time waveform of the generated voltage. The voltage polarity analysis module analyzes the current voltage value or real-time waveform of the voltage based on the current working environment type of the signal acquisition part, and determines the voltage polarity of the current voltage based on the analysis results. The early warning analysis module analyzes the voltage polarity of the current voltage. If it determines that the voltage polarity of the current voltage does not match the preset voltage polarity, it issues an early warning.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of a method for identifying the voltage polarity of a hard platen circuit according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of a method for identifying the polarity of a hard platen circuit voltage as described in any one of claims 1 to 7.

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