Switchgear power testing method based on dual power supply

Abstract

The present application relates to the technical field of switch cabinet electrical testing equipment, and in particular to a switch cabinet electrical testing method based on a dual power supply state. The method first obtains the electric field strength of two endpoints at different distances from the incoming line bus in the switch cabinet when only the switch cabinet bus is energized; then, when the power supply is normal, the electric field strength of the above two points is obtained, so that the changes in the electric field strength of the incoming line bus caused by the charged body other than the incoming line bus at the above two points can be judged; the last step is to analyze and process the above detected data when the switch cabinet is powered off for maintenance, so as to judge whether the switch cabinet is in a power-off state. Testing electricity by measuring the electric field strength is a non-contact measurement with a high safety factor; at the same time, its electrical testing coverage is relatively wide, and when the switch cabinet is being repaired, it is highly applicable to situations where there are multiple power loads and the power loads are uncertain whether they are energized or not.

Description

Technical Field

[0001] The present application relates to the technical field of switch cabinet electrical testing equipment, and in particular to a switch cabinet electrical testing method based on a dual power supply state. Background Art

[0002] The statements in this section merely provide background technical information related to the present application and do not necessarily constitute prior art.

[0003] At present, when the outgoing line side of the switch cabinet is turned for maintenance under the dual power supply state, it is necessary to verify that there is no voltage before closing the grounding knife switch. This is because although the power supply side is powered off during maintenance, the outgoing line side may have returned power due to the dual power supply of the switch cabinet; and there are two common methods for the switch cabinet to test whether there is electricity on the outgoing line side: 1. Judge by whether the display light of the live display device is on; 2. Judge by the value of the line current of the protection device. Since the circuit breaker of the switch cabinet has been disconnected during the power test, the current of the second method has no value and cannot be tested. This does not meet the safety regulations that "for equipment that cannot be directly tested, indirect power testing can be performed. When judging, at least two indications of non-same principle or non-same source should change accordingly, and all these confirmed indications should change accordingly at the same time to confirm that the equipment has no power". Personnel need to go to the outgoing line side pole tower to test electricity, which is inefficient, wastes a lot of manpower, material resources, and time, and is prone to high-altitude falls or personal electric shock injuries. In addition, the efficiency of using a conventional electric test pen to test the switch cabinet during maintenance is relatively low. This is because there is more than one power load during maintenance, and the maintenance personnel need to use an electric test pen to test each power load, which is not only time-consuming and labor-intensive, but also unsafe.

[0004] In view of this, it is necessary to provide a switch cabinet power testing method based on dual power supply state to solve the above technical problems. Summary of the invention

[0005] Based on this, in order to solve the above technical problems, the present application provides a method for testing the electricity of a switch cabinet under dual power supply state.

[0006] The technical solution adopted by this application to solve the problems existing in the prior art is:

[0007] This application proposes a switch cabinet power testing method based on dual power supply state:

[0008] The following steps are involved:

[0009] Step 1: Only energize the busbar at the incoming line end of the switch cabinet to obtain the electric field strength of the busbar at the incoming line end of the switch cabinet at point A ; Get the electric field strength of the incoming busbar at point B in the switch cabinet ;

[0010] Among them: the distance between point A and the incoming line end busbar is less than the distance between point B and the incoming line end busbar;

[0011] Step 2: When all switch cabinets are powered normally, use the tester to obtain the electric field strength at point A in the switch cabinet. :

[0012]

[0013] in:

[0014] is the electric field strength of the charged body other than the incoming bus at point A;

[0015] Step 3: When all switch cabinets are powered normally, use the tester to obtain the electric field strength at point B in the switch cabinet. ;

[0016]

[0017] in:

[0018] is the electric field strength of the charged body other than the incoming bus at point B;

[0019] Step 4: Calculate the electric field formed by the charged bodies other than the incoming bus at point A. Contribution and at point B Contribution ;

[0020] in: for The peak electric field strength is given by the formula to conclude; for The peak electric field strength is given by the formula to conclude;

[0021] Step 5: Determine the contribution change trend of the electric field formed by the charged body other than the incoming busbar from point A to point B; Parameters that characterize the contribution change:

[0022]

[0023] but:

[0024] when >0, the electric field formed by the charged body other than the incoming busbar from point A to point B is determined to be a positive contribution;

[0025] when When <0, the electric field formed by the charged body other than the incoming busbar from point A to point B is determined to be a negative contribution;

[0026] when =0, it is determined that the electric field formed by the charged body other than the incoming busbar from point A to point B has zero contribution;

[0027] Step 6: When the switch cabinet is powered off for maintenance, use the tester to obtain the electric field strength at point A and the electric field strength at point B ;

[0028] if:

[0029] The peak electric field strength = , The peak electric field strength = ;

[0030] and:

[0031] when >0, satisfying: The peak electric field strength of The peak electric field strength;

[0032] when When <0, it satisfies: The peak electric field strength is The peak electric field strength;

[0033] when =0, it satisfies: The peak electric field strength of The peak electric field strength = ;

[0034] in is the allowable error value;

[0035] It is determined that the switch cabinet is in a power-off state.

[0036] Preferably, in step 6, the condition for determining that the switch cabinet is in a power-off state further includes:

[0037] There is at least one other contact-type electrical testing method for determining that the switchgear is in a de-energized state.

[0038] Preferably, the contact-type measurement and testing method is a high-voltage testing device provided on the switch cabinet, and the high-voltage testing device is electrically connected to the busbar at the incoming line end of the switch cabinet, and is used to test the busbar at the incoming line end of the switch cabinet and display the voltage.

[0039] Preferably, the contact type measurement and testing method is a lightning arrester arranged below the incoming busbar and a lightning arrester leakage current detection device connected to the lightning arrester, wherein the lightning arrester leakage current detection device is used to detect the leakage current of the lightning arrester, and the incoming busbar of the switch cabinet is tested for electricity by detecting whether the lightning arrester has leakage current;

[0040] Wherein: when the arrester leakage current detection device detects that the arrester leakage current is not 0, the switch cabinet is not powered off;

[0041] When the arrester leakage current detection device detects that the arrester leakage current is 0, the switch cabinet is powered off.

[0042] Preferably,

[0043]

[0044]

[0045] in:

[0046] The first busbar other than the incoming busbar in the switch cabinet The electric field strength of a charged body at point A;

[0047] The first busbar other than the incoming busbar in the switch cabinet The electric field strength of a charged body at point B;

[0048] is the number of live parts other than the busbar at the incoming line end;

[0049] .

[0050] Preferably, the incoming line bus is three-phase electricity, and both point A and point B are points in the switch cabinet that are different from the incoming line bus;

[0051] The distance between point A and the incoming line end busbar is shorter than the distance between point B and the incoming line end busbar, which means that the shortest distance from point A to any point on the incoming line end busbar is shorter than the shortest distance from point B to any point on the incoming line end busbar.

[0052] Preferably, the tester is an electric field strength tester;

[0053] The electric field strength tester comprises an electric field sensor and a host with a display function;

[0054] The electric field sensor comprises a first electric field sensor and a second electric field sensor, which are used to detect the electric field strength at point A and point B respectively.

[0055] Preferably, in the step 4, The peak electric field strength The calculation method is:

[0056] S00: Obtain the electric field strength of the incoming busbar at point A in the switch cabinet in step 1 At the moment Record The amplitude ;

[0057] In step 2, the electric field strength at point A in the switch cabinet is obtained by the tester. At the moment Record The amplitude ;

[0058] S01: Set time interval , according to different value, respectively ,

[0059] Calculate the contrast amplitude respectively :

[0060]

[0061] in: ∈Z and ; ;

[0062] It is the cycle of the AC power passing through the busbar at the incoming line end of the switch cabinet;

[0063] S02: Set time interval , according to different value, respectively ,

[0064] Calculate the contrast amplitude respectively :

[0065]

[0066] in: ∈Z and ; ;

[0067] It is the cycle of the AC power passing through the busbar at the incoming line end of the switch cabinet;

[0068] S03: Take all contrast amplitudes and contrast amplitude The maximum value in , ∈Z and ; ; ∈Z and ; ;but:

[0069]

[0070] The peak electric field strength The calculation method is:

[0071] S10: Obtain the electric field strength of the incoming busbar at point A in the switch cabinet in step 1 At the moment Record The amplitude ;

[0072] In step 2, the electric field strength at point A in the switch cabinet is obtained by the tester. At the moment Record The amplitude ;

[0073] S11: Set time interval , according to different value, respectively ,

[0074] Calculate the contrast amplitude respectively :

[0075]

[0076] in: ∈Z and ; ;

[0077] It is the cycle of the AC power passing through the busbar at the incoming line end of the switch cabinet;

[0078] S12: Set time interval , according to different value, respectively ,

[0079] Calculate the contrast amplitude respectively :

[0080]

[0081] in: ∈Z and ; ;

[0082] It is the cycle of the AC power passing through the busbar at the incoming line end of the switch cabinet;

[0083] S13: Take all comparison amplitudes and contrast amplitude The maximum value in , ∈Z and ; ; ∈Z and ; ;but:

[0084] .

[0085] Preferably, the first electric field sensor and the second electric field sensor are fixedly arranged inside the switch cabinet.

[0086] Preferably, both the first electric field sensor and the second electric field sensor are MEMS electric field sensors.

[0087] Compared with the prior art, the beneficial effects of this application are:

[0088] 1. The electrical inspection is carried out by measuring the electric field strength, which is a non-contact measurement with a high safety factor. At the same time, its electrical inspection covers a wide range. When the switch cabinet is repaired, it is especially suitable for situations where there are multiple power loads and it is uncertain whether the power loads are energized or not.

[0089] 2. When there are multiple charged bodies, the field strength can be measured but is difficult to distinguish and quantify. This application utilizes the degree and trend of influence of charged bodies other than the incoming busbar on the electric field strength of the incoming busbar, combined with mathematical calculations, to conduct a quantitative analysis of the internal electric field strength during switch cabinet maintenance, and provides a sufficient condition for determining power outages to achieve electrical testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0090] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0091] Figure 1 This is a schematic diagram of the logic block diagram of the switch cabinet power testing method based on the dual power supply state of the present application. DETAILED DESCRIPTION

[0092] The present application is further described below in conjunction with the accompanying drawings and embodiments.

[0093] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0094] In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present disclosure, and do not specifically refer to any part or element in the present disclosure and should not be understood as limitations on the present disclosure.

[0095] The present application provides a switch cabinet power testing method based on dual power supply state. Figure 1 This is a simple logic block diagram of a switch cabinet power testing method based on a dual power supply state of the present application. The switch cabinet power testing method based on a dual power supply state of the present application first only energizes the incoming line bus to obtain the electric field strength at points A and B, that is, the electric field strength of the incoming line bus of the switch cabinet; in this step, all electrical equipment near the switch cabinet are powered off, and only the incoming line bus of the switch cabinet is energized. In actual use, this step can be performed at the beginning of the installation and use of the switch cabinet; then, during normal power supply use, the electric field strength at points A and B is obtained, that is, all electrical equipment near the switch cabinet is powered off. When the electrical equipment is in normal use and the switch cabinet is energized, the electric field strength at points A and B is obtained; in this way, the contribution of charged bodies other than the incoming busbar to the electric field strength of the incoming busbar at points A and B can be determined. Specifically, the change in the electric field strength of the incoming busbar caused by charged bodies other than the incoming busbar at points A and B is determined; the last step is to determine whether the switch cabinet is in a power-off state by using the change in the electric field strength at points A and B and the contribution of charged bodies other than the incoming busbar to the electric field strength of the incoming busbar at points A and B when the switch cabinet is powered off for maintenance.

[0096] Specifically, the switch cabinet power testing method based on the dual power supply state of the present application includes the following steps:

[0097] Step 1: Only energize the busbar at the incoming line end of the switch cabinet to obtain the electric field strength of the busbar at the incoming line end of the switch cabinet at point A ; Get the electric field strength of the incoming busbar at point B in the switch cabinet ;

[0098] Among them: the distance between point A and the incoming line end busbar is less than the distance between point B and the incoming line end busbar;

[0099] Step 2: When all switch cabinets are powered normally, use the tester to obtain the electric field strength at point A in the switch cabinet. :

[0100]

[0101] in:

[0102] is the electric field strength of the charged body other than the incoming bus at point A;

[0103] Step 3: When all switch cabinets are powered normally, use the tester to obtain the electric field strength at point B in the switch cabinet. ;

[0104]

[0105] in:

[0106] is the electric field strength of the charged body other than the incoming bus at point B;

[0107] Step 4: Calculate the electric field formed by the charged bodies other than the incoming bus at point A. Contribution and at point B Contribution ;

[0108] in: for The peak electric field strength is given by the formula to conclude; for The peak electric field strength is given by the formula to conclude;

[0109] Step 5: Determine the contribution change trend of the electric field formed by the charged body other than the incoming busbar from point A to point B; Parameters that characterize the contribution change:

[0110]

[0111] but:

[0112] when >0, the electric field formed by the charged body other than the incoming busbar from point A to point B is determined to be a positive contribution;

[0113] when When <0, the electric field formed by the charged body other than the incoming busbar from point A to point B is determined to be a negative contribution;

[0114] when =0, it is determined that the electric field formed by the charged body other than the incoming busbar from point A to point B has zero contribution;

[0115] Step 6: When the switch cabinet is powered off for maintenance, use the tester to obtain the electric field strength at point A and the electric field strength at point B ;

[0116] if:

[0117] The peak electric field strength = , The peak electric field strength = ;

[0118] and:

[0119] when >0, satisfying: The peak electric field strength of The peak electric field strength;

[0120] when When <0, it satisfies: The peak electric field strength is The peak electric field strength;

[0121] when =0, it satisfies: The peak electric field strength of The peak electric field strength = ;

[0122] in is the allowable error value;

[0123] It is determined that the switch cabinet is in a power-off state.

[0124] It should be noted that the present application provides a sufficient condition for judging whether the switch cabinet is energized, that is, when the above conditions occur, the switch cabinet must be in a power-off state; the purpose of applying this method is to adapt to the background described in the background technology, that is, the safety regulations stipulate that "for equipment that cannot be directly tested for electricity, indirect electricity testing can be performed. When judging, there should be at least two indications that are not of the same principle or source that have undergone corresponding changes, and all these determined indications have undergone corresponding changes at the same time, in order to confirm that the equipment has no power." As long as it is determined that the switch cabinet is in a power-off state, it can be repaired. When it is not confirmed that the power cannot be cut off, it is necessary to re-test the switch cabinet through other power-testing methods for comprehensive judgment. On the other hand, during maintenance, it is unrealistic to conduct contact power testing on every position of the switch cabinet, and even if the power is cut off, it is not certain whether there will be power on in the next second, so the power testing method provided by the present application is more applicable.

[0125] In step 6, the conditions for determining that the switch cabinet is in a power-off state also include:

[0126] There is at least one other contact-type electrical testing method for determining that the switchgear is in a de-energized state.

[0127] In some embodiments, the contact measurement and electrical testing method is a high-voltage electrical testing device installed on the switch cabinet, and the high-voltage electrical testing device is electrically connected to the busbar at the incoming line end of the switch cabinet, and is used to test the busbar at the incoming line end of the switch cabinet and display the voltage.

[0128] In some embodiments, the contact measurement and testing method is a lightning arrester arranged under the incoming busbar and a lightning arrester leakage current detection device connected to the lightning arrester, wherein the lightning arrester leakage current detection device is used to detect the leakage current of the lightning arrester, and the incoming busbar of the switch cabinet is tested by detecting whether the lightning arrester has leakage current;

[0129] Wherein: when the arrester leakage current detection device detects that the arrester leakage current is not 0, the switch cabinet is not powered off;

[0130] When the arrester leakage current detection device detects that the arrester leakage current is 0, the switch cabinet is powered off.

[0131] In some embodiments,

[0132]

[0133]

[0134] in:

[0135] The first busbar other than the incoming busbar in the switch cabinet The electric field strength of a charged body at point A;

[0136] The first busbar other than the incoming busbar in the switch cabinet The electric field strength of a charged body at point B;

[0137] is the number of live parts other than the busbar at the incoming line end;

[0138] .

[0139] In some embodiments, the incoming bus is three-phase electricity, and point A and point B are points in the switch cabinet that are different from the incoming bus; the distance between point A and the incoming bus is shorter than the distance between point B and the incoming bus, which means that the shortest distance from point A to any point on the incoming bus is shorter than the shortest distance from point B to any point on the incoming bus.

[0140] In some embodiments, the tester is an electric field strength tester;

[0141] The electric field strength tester comprises an electric field sensor and a host with a display function;

[0142] The electric field sensor comprises a first electric field sensor and a second electric field sensor, which are used to detect the electric field strength at point A and point B respectively.

[0143] In some embodiments, in step 4, The peak electric field strength The calculation method is:

[0144] S00: Obtain the electric field strength of the incoming busbar at point A in the switch cabinet in step 1 At the moment Record The amplitude ;

[0145] In step 2, the electric field strength at point A in the switch cabinet is obtained by the tester. At the moment Record The amplitude ;

[0146] S01: Set time interval , according to different value, respectively ,

[0147] Calculate the contrast amplitude respectively :

[0148]

[0149] in: ∈Z and ; ;

[0150] It is the cycle of the AC power passing through the busbar at the incoming line end of the switch cabinet;

[0151] S02: Set time interval , according to different value, respectively ,

[0152] Calculate the contrast amplitude respectively :

[0153]

[0154] in: ∈Z and ; ;

[0155] It is the cycle of the AC power passing through the busbar at the incoming line end of the switch cabinet;

[0156] S03: Take all contrast amplitudes and contrast amplitude The maximum value in , ∈Z and ; ; ∈Z and ; ;but:

[0157]

[0158] The peak electric field strength The calculation method is:

[0159] S10: Obtain the electric field strength of the incoming busbar at point A in the switch cabinet in step 1 At the moment Record The amplitude ;

[0160] In step 2, the electric field strength at point A in the switch cabinet is obtained by the tester. At the moment Record The amplitude ;

[0161] S11: Set time interval , according to different value, respectively ,

[0162] Calculate the contrast amplitude respectively :

[0163]

[0164] in: ∈Z and ; ;

[0165] It is the cycle of the AC power passing through the busbar at the incoming line end of the switch cabinet;

[0166] S12: Set time interval , according to different value, respectively ,

[0167] Calculate the contrast amplitude respectively :

[0168]

[0169] in: ∈Z and ; ;

[0170] It is the cycle of the AC power passing through the busbar at the incoming line end of the switch cabinet;

[0171] S13: Take all comparison amplitudes and contrast amplitude The maximum value in , ∈Z and ; ; ∈Z and ; ;but:

[0172] .

[0173] The first electric field sensor and the second electric field sensor used in the present application are both fixedly arranged inside the switch cabinet. In some embodiments, the first electric field sensor and the second electric field sensor are both MEMS electric field sensors.

[0174] The switch cabinet power testing method provided in the present application performs power testing by measuring the electric field strength, which is a non-contact measurement with a high safety factor. At the same time, its power testing coverage is relatively wide, and it is especially suitable for situations where there are multiple power loads and it is uncertain whether the power loads are energized or not when the switch cabinet is being repaired.

[0175] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0176] Although the above describes the specific implementation methods of the present application in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present application. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present application, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the present application.

Claims

1. A method for testing the power of a switch cabinet under dual power supply conditions, characterized in that: The following steps are involved: Step 1: Only energize the busbar at the incoming line end of the switch cabinet to obtain the electric field strength of the busbar at the incoming line end of the switch cabinet at point A ; Get the electric field strength of the incoming busbar at point B in the switch cabinet ; Among them: the distance between point A and the incoming line end busbar is less than the distance between point B and the incoming line end busbar; Step 2: When all switch cabinets are powered normally, use the tester to obtain the electric field strength at point A in the switch cabinet. : in: is the electric field strength of the charged body other than the incoming bus at point A; Step 3: When all switch cabinets are powered normally, use the tester to obtain the electric field strength at point B in the switch cabinet. ; in: is the electric field strength of the charged body other than the incoming bus at point B; Step 4: Calculate the electric field formed by the charged bodies other than the incoming bus at point A. Contribution and at point B Contribution ; in: for The peak electric field strength is given by the formula to conclude; for The peak electric field strength is given by the formula to conclude; Step 5: Determine the contribution change trend of the electric field formed by the charged body other than the incoming busbar from point A to point B; Parameters that characterize the contribution change: but: when >0, the electric field formed by the charged body other than the incoming busbar from point A to point B is determined to be a positive contribution; when When <0, the electric field formed by the charged body other than the incoming busbar from point A to point B is determined to be a negative contribution; when =0, it is determined that the electric field formed by the charged body other than the incoming busbar from point A to point B has zero contribution; Step 6: When the switch cabinet is powered off for maintenance, use the tester to obtain the electric field strength at point A and the electric field strength at point B ; if: The peak electric field strength = , The peak electric field strength = ; and: when >0, satisfying: The peak electric field strength of The peak electric field strength; when When <0, it satisfies: The peak electric field strength is The peak electric field strength; when =0, it satisfies: The peak electric field strength of The peak electric field strength = ; in is the allowable error value; It is determined that the switch cabinet is in a power-off state.

2. The switch cabinet power testing method based on dual power supply state according to claim 1 is characterized in that: In step 6, the conditions for determining that the switch cabinet is in a power-off state also include: There is at least one other contact-type electrical testing method for determining that the switchgear is in a de-energized state.

3. The switch cabinet power testing method based on dual power supply state according to claim 2 is characterized in that: The contact type measurement and testing method is a high voltage testing device arranged on the switch cabinet, and the high voltage testing device is electrically connected to the busbar at the incoming line end of the switch cabinet, and is used to test the busbar at the incoming line end of the switch cabinet and display the voltage.

4. The switch cabinet power testing method based on dual power supply state according to claim 2 is characterized in that: The contact type measurement and testing method is a lightning arrester arranged under the incoming busbar and a lightning arrester leakage current detection device connected to the lightning arrester. The lightning arrester leakage current detection device is used to detect the leakage current of the lightning arrester. By detecting whether the lightning arrester has leakage current, the incoming busbar of the switch cabinet is tested for electricity. Wherein: when the arrester leakage current detection device detects that the arrester leakage current is not 0, the switch cabinet is not powered off; When the arrester leakage current detection device detects that the arrester leakage current is 0, the switch cabinet is powered off.

5. The switch cabinet power testing method based on dual power supply state according to claim 1 is characterized in that: in: The first busbar other than the incoming busbar in the switch cabinet The electric field strength of a charged body at point A; The first busbar other than the incoming busbar in the switch cabinet The electric field strength of a charged body at point B; is the number of live parts other than the busbar at the incoming line end; 。 6. The switch cabinet power testing method based on dual power supply state according to claim 1 is characterized in that: The incoming line bus is three-phase electricity, and the points A and B are points in the switch cabinet that are different from the incoming line bus; The distance between point A and the incoming line end busbar is shorter than the distance between point B and the incoming line end busbar, which means that the shortest distance from point A to any point on the incoming line end busbar is shorter than the shortest distance from point B to any point on the incoming line end busbar.

7. The switch cabinet power testing method based on dual power supply state according to claim 1 is characterized in that: The tester is an electric field strength tester; The electric field strength tester comprises an electric field sensor and a host with a display function; The electric field sensor comprises a first electric field sensor and a second electric field sensor, which are used to detect the electric field strength at point A and point B respectively.

8. The switch cabinet power testing method based on dual power supply state according to claim 1 is characterized in that: In the step 4, The peak electric field strength The calculation method is: S00: Obtain the electric field strength of the incoming busbar at point A in the switch cabinet in step 1 At the moment Record The amplitude ; In step 2, the electric field strength at point A in the switch cabinet is obtained by the tester. At the moment Record The amplitude ; S01: Set time interval , according to different value, respectively , Calculate the contrast amplitude respectively : in: ∈Z and ; ; It is the cycle of the AC power passing through the busbar at the incoming line end of the switch cabinet; S02: Set time interval , according to different value, respectively , Calculate the contrast amplitude respectively : in: ∈Z and ; ; It is the cycle of the AC power passing through the busbar at the incoming line end of the switch cabinet; S03: Take all contrast amplitudes and contrast amplitude The maximum value in , ∈Z and ; ; ∈Z and ; ;but: The peak electric field strength The calculation method is: S10: Obtain the electric field strength of the incoming busbar at point A in the switch cabinet in step 1 At the moment Record The amplitude ; In step 2, the electric field strength at point A in the switch cabinet is obtained by the tester. At the moment Record The amplitude ; S11: Set time interval , according to different value, respectively , Calculate the contrast amplitude respectively : in: ∈Z and ; ; It is the cycle of the AC power passing through the busbar at the incoming line end of the switch cabinet; S12: Set time interval , according to different value, respectively , Calculate the contrast amplitude respectively : in: ∈Z and ; ; It is the cycle of the AC power passing through the busbar at the incoming line end of the switch cabinet; S13: Take all comparison amplitudes and contrast amplitude The maximum value in , ∈Z and ; ; ∈Z and ; ;but: 。 9. The switch cabinet power testing method based on dual power supply state according to claim 7 is characterized in that: The first electric field sensor and the second electric field sensor are fixedly arranged inside the switch cabinet.

10. The switch cabinet power testing method based on dual power supply state according to claim 9 is characterized in that: The first electric field sensor and the second electric field sensor are both MEMS electric field sensors.

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