RCBO instantaneous action characteristic detection method

Abstract

A RCBO instantaneous operation characteristic detection method comprises the steps that a detection circuit is installed, impedance used for adjusting rated short-circuit current of each phase and adjustable impedance used for adjusting the impedance lower than the rated short-circuit current are adjusted, the rated short-circuit capacity index value of a product is achieved, and a needed test current value and a needed power factor are detected; and a detection method, a product working principle and a detection loop are fundamentally integrated and applied again. According to the method, the requirements of detection conditions on a test loop are utilized, and the phenomenon that the action time between the thermal protection characteristic and the electric leakage protection characteristic of a product is overlapped in a certain time range is also considered, so that the detection of the wiring mode of the loop, the fixation of the detection loop, the determination of the position of the product and other links can be realized. The action time of the thermal protection characteristic and the electric leakage protection characteristic can be fully and clearly distinguished, and the accuracy of the detection result can be improved to 100%.

Description

Technical Field

[0001] The present invention relates to the technical field of instantaneous action characteristic detection of RCBOs, and particularly to a method for detecting the instantaneous action characteristics of RCBOs. Background Art

[0002] In the currently effective national standards, the detection of instantaneous tripping action is to ensure that in actual use of the product, in the case of overload for a certain period of time, the product can cut off the overloaded circuit within the expected time, so as to achieve the protection of the line, electrical appliances, and corresponding components of the switch and lamp. This function is completed by a thermal protection element - a bimetal inside the product. The thermal protection element (bimetal) is usually composed of two different metals (such as steel and copper or steel and aluminum), which have different expansion coefficients. During operation, the current flows through the circuit of the circuit breaker, and the generated heat causes the temperature of the bimetal to rise. Due to the different expansion rates of different metals, the bimetal will bend. When the current continuously exceeds the set overload value, the bending degree of the bimetal will gradually increase until the contact is disconnected, cutting off the current, thereby realizing overload protection. Therefore, the thermal protection element should have certain thermal expansion differences, good durability, sufficient accuracy and other characteristics to meet the requirements of different types, such as B-type action curves, C-type action curves, D-type action curves, K-type action curves; At the same time, in order to protect the safety of household electricity, the residual current operated circuit-breaker with overcurrent protection for household and similar uses also has a leakage protection function, which is realized by a leakage module. The leakage module (also called a leakage protector, leakage switch or leakage circuit breaker) is an electrical protection device, mainly used to detect the leakage phenomenon in the electrical circuit and quickly cut off the power supply when leakage occurs, thereby protecting personal safety and preventing electric shock accidents and electrical fires. The working principle of the leakage module mainly depends on the following aspects: (1) Leakage current detection: The leakage module detects the leakage current through a leakage current transformer (usually a zero-sequence current transformer or a differential transformer). When the current passes through the electrical circuit, normally, the current entering the circuit should be equal to the current returning. If a leakage phenomenon occurs in a certain part of the circuit (for example, the current leaks into the ground through the damaged insulation part), the current entering the circuit and the returning current will be unequal, generating a differential current. At this time, the leakage function acts, and the tripping mechanism of the product is actuated through a push rod to realize the protection function; (2) Protection mechanism: When the leakage module detects that the differential current exceeds the set threshold (such as 30 mA, 100 mA, etc.), it will trigger the tripping protection mechanism. The leakage module usually contains an electronic circuit (such as an electromagnet or an electronic switch). When the leakage current reaches the safety threshold, this circuit automatically cuts off the circuit and stops the power supply, thereby preventing further electrical safety hazards; Based on the existing detection conditions, for the verification of this function, the national standard does not give a clear wiring or detection circuit diagram, but only stipulates that the test circuit meets the test conditions. In the detection of the instantaneous tripping characteristics of residual current operated circuit breakers with overcurrent protection for household and similar use, where the operating function is related to the power supply voltage, when both products with two current loops and four current loops have overcurrent protection, during this detection, the thermal protection function and the leakage protection function may act alternately, which to a certain extent increases the probability of incorrect test results. To solve the above problems, a detection method for the instantaneous tripping characteristics of RCBO is proposed. Summary of the Invention

[0003] According to the above technical problems, the present invention provides a detection method for the instantaneous tripping characteristics of RCBO, including the following steps: 1) Install the detection circuit, and adjust the impedance for adjusting the rated short-circuit current and the adjustable impedance for adjusting below the rated short-circuit current in each phase to reach the rated short-circuit capacity index value of the product, as well as the test current value and power factor required for detection; 2) Select wires with appropriate length and rated current, and connect the RCBO to be tested to the detection circuit; 3) Determine the acquisition range and acquisition time length of the acquisition device according to the rated voltage and test current magnitude of the RCBO to be tested, and start the acquisition device; 4) Close the short-circuit joint switch in the detection circuit to connect the detection circuit. At this time, an analog overload current appears in the circuit, the RCBO to be tested operates, the acquisition process is completed, and the test data is presented in the acquisition device; 5) Analyze the acquired test data to determine whether the operating time meets the standard requirements. After the interval time reaches the expected time, manually operate the no-load operating handle of the RCBO to be tested to close the RCBO 1 - 2 times, confirm that the no-load closing and opening of the product are normal. After confirming that the product is normal, place the no-load operating handle in the open position; 6) Start the data acquisition system, close the short-circuit joint switch in the detection circuit. At this time, use a closing mechanism that meets the relevant standard requirements to perform a closing operation on the no-load operating handle of the RCBO to be tested. After the RCBO to be tested connects the circuit, due to the existence of the overload current, the RCBO to be tested automatically trips, completing the first closing and opening operation during the product detection process, and completing the test data acquisition. Read the relevant data to determine whether the product to be tested meets the standard requirements; 7) Repeat operation steps 5 and 6 twice. After the data is confirmed to meet or not meet the standard requirements, complete the test detection of the instantaneous tripping action characteristics of the first pole of the RCBO to be tested. During the entire detection process, the leakage operating handle of the RCBO to be tested does not operate and always remains in the closed state, and the test is successful; 8) Disconnect the wiring, replace the other products to be tested of the RCBO to be tested, and perform the detection operation according to the above steps; 9) Repeat the above steps 1-9 to detect the RCBOs to be tested in different current circuits; Furthermore, the power supply of the detection circuit in step 1 is a three-phase four-wire incoming line, where the three-phase lines are connected to the short-circuit switch, and there is an impedance for adjusting the rated short-circuit power on each phase line. The short-circuit switch is connected to the RCBO to be tested below. A voltage sensor is provided on the RCBO to be tested, and a current sensor and an adjustable impedance for adjusting below the rated short-circuit current are provided at the load end outlet of the RCBO to be tested. The N-phase line of the power supply passes through the N-phase incoming line end of the RCBO to be tested and the N-phase load end; Furthermore, the A-phase incoming line end of the RCBO to be tested in step 2 is connected to the A-phase line of the power supply, the A-phase load end of the RCBO to be tested is connected to the front end of the adjustable impedance for adjusting below the rated short-circuit current, the N-phase incoming line end of the RCBO to be tested is connected to the N-phase line of the power supply, and the N-phase load end of the RCBO to be tested is connected to the rear end of the adjustable impedance for adjusting below the rated short-circuit current; Furthermore, in step 8, the maximum number of samples to be detected is three, and the minimum number is one.

[0004] Advantages of the present invention: The present invention fundamentally re-integrates and applies the detection method, the working principle of the product, and the detection circuit. That is, it utilizes the requirements of the detection conditions for the test circuit, and also takes into account the superposition phenomenon of the action times between the thermal protection characteristic and the leakage protection characteristic of the product itself within a certain time range, which may affect the accuracy of the final detection result. Through the invention of this method, for the wiring method of the detection circuit, the fixed detection circuit, and the determination of the product position, etc., the action times of the thermal protection characteristic and the leakage protection characteristic can be clearly distinguished, and the accuracy of the detection result can be increased to 100%. Description of the drawings

[0005] Figure 1 Schematic diagram of the RCBO structure with four current circuits for the RCBO instantaneous action characteristic detection method of the present invention; Figure 2 Schematic diagram of the RCBO structure with two current circuits for the RCBO instantaneous action characteristic detection method of the present invention; Figure 3 Side view of the RCBO for the RCBO instantaneous action characteristic detection method of the present invention; Figure 4 Instantaneous tripping action test detection circuit diagram for the RCBO instantaneous action characteristic detection method of the present invention; As shown in the figure: 1. A-phase incoming line terminal; 2. A-phase outgoing line terminal; 3. B-phase incoming line terminal; 4. B-phase outgoing line terminal; 5. C-phase incoming line terminal; 6. C-phase outgoing line terminal; 7. N-phase incoming line terminal; 8. N-phase outgoing line terminal; 9. Protective cover; 21. A-phase load terminal; 41. B-phase load terminal; 55. Operating handle; 66. Leakage operation handle; 61. C-phase load terminal; 81. N-phase load terminal. Detailed implementation

[0006] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0007] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0008] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0009] Embodiment 1 The present invention provides a method for detecting the instantaneous action characteristics of an RCBO, including the following steps: 1) Install a detection circuit, and adjust the impedance for adjusting the rated short-circuit current in each phase, as well as the adjustable impedance for adjusting below the rated short-circuit current, to reach the numerical value of the product's rated short-circuit capacity index, as well as the test current value and power factor required for detection; 2) Select wires with appropriate length and rated current, and connect the RCBO to be tested to the detection circuit; 3) Determine the acquisition range and acquisition time length of the acquisition device according to the rated voltage and test current of the RCBO to be tested, and start the acquisition device; 4) Close the short - circuit joint switch in the detection circuit to connect the detection circuit. At this time, an analog overload current appears in the circuit, the RCBO to be tested operates, the acquisition process is completed, and the test data is presented in the acquisition device; 5) Analyze the acquired test data to judge whether the operating time meets the standard requirements. After the interval time reaches the expected time, manually operate the no - load operating handle of the RCBO to be tested to close the RCBO to be tested 1 - 2 times. Confirm that the no - load closing and opening of the product are normal. After confirming that the product is normal, place the no - load operating handle in the open position; 6) Start the data acquisition system and close the short - circuit joint switch in the detection circuit. At this time, use a closing mechanism that meets the relevant standard requirements to perform a closing operation on the no - load operating handle of the RCBO to be tested. After the RCBO to be tested connects the circuit, due to the existence of the overload current, the RCBO to be tested automatically trips, completing the first closing and opening operation during the product detection process and completing the test data acquisition. Read the relevant data to determine whether the product to be tested meets the standard requirements; 7) Repeat operation steps 5 and 6 twice. After the data is confirmed to meet or not meet the standard requirements, complete the test detection of the instantaneous tripping action characteristic of the first pole of the RCBO to be tested. During the entire detection process, the leakage - operating handle of the RCBO to be tested does not operate and always remains in the closed state, and the test is successful; 8) Remove the wiring, replace the other poles of the RCBO to be tested with other products to be tested, and perform the detection operation according to the above steps; 9) Repeat the above steps 1 - 9 to detect the RCBOs to be tested with different current circuits; Furthermore, the power supply of the detection circuit in step 1 is a three - phase four - wire incoming line, where the three - phase lines are connected to the short - circuit closing switch, and there is an impedance for each phase to adjust the rated short - circuit power on each phase line. The short - circuit closing switch is connected to the RCBO to be tested below. A voltage sensor is provided on the RCBO to be tested, and a current sensor and an adjustable impedance for adjusting below the rated short - circuit current are provided at the load - side outlet of the RCBO to be tested. The N - phase line of the power supply passes through the N - phase incoming line end of the RCBO to be tested and the N - phase load end; Furthermore, in step 2, the A - phase incoming line end of the RCBO to be tested is connected to the A - phase line of the power supply, the A - phase load end of the RCBO to be tested is connected to the front end of the adjustable impedance for adjusting below the rated short - circuit current, the N - phase incoming line end of the RCBO to be tested is connected to the N - phase line of the power supply, and the N - phase load end of the RCBO to be tested is connected to the rear end of the adjustable impedance for adjusting below the rated short - circuit current; Furthermore, in step 8, the maximum number of samples to be tested is three, and the minimum number is one.

[0010] Example 2 For the purpose of this detection test, the main idea is to detect the instantaneous tripping characteristics of an RCBO whose operating function is related to the supply voltage. Due to the operating characteristics of the thermal protection element (bimetal strip) in the product, the overload current existing in the detection circuit is cut off to simulate the possible overload phenomenon in actual use. During the detection process, since it is required to detect each protection pole of the RCBO separately under any voltage and at the rated voltage U0 (phase-neutral line) with a power factor of 0.95 - 1 to obtain a more accurate operating time; 1. For an RCBO with two current circuits: 1.1 First, according to the rated short-circuit capacity index marked on the product, the impedance for adjusting the rated short-circuit current for each phase, and the adjustable impedance for adjusting below the rated short-circuit current, reach the numerical value of the product's rated short-circuit capacity index, as well as the test current value and power factor required for the detection; 1.2 After all the required values of the detection circuit are adjusted, select the wire related to the rated current of the product to be tested according to the detection standard requirements, and determine the length of the wire used by referring to the given values in the standard. Connect the RCBO to be tested to the position D of the detection circuit. Connect the phase A incoming line terminal of the RCBO to be tested to the power supply incoming line terminal of the detection circuit, and connect the phase A load terminal of the RCBO to be tested to the front end of the adjustable impedance for adjusting below the rated short-circuit current in the detection circuit; then connect the N-pole incoming line terminal of the detection circuit to the phase N incoming line terminal of the RCBO to be tested, and then connect the rear end of the adjustable impedance for adjusting below the rated short-circuit current in the detection circuit to the phase N load terminal of the RCBO to be tested. Close the product to be tested, and the product wiring is completed; 1.3 Determine the acquisition range and acquisition time length of the acquisition device according to the magnitude of the rated voltage U0 (phase-neutral line, measured by the voltage sensor Ur) and the test current (measured by the current sensor I) of the product to be detected, and start the acquisition device. The data acquisition system is ready; 1.4 Close the short-circuit switch of the detection circuit to connect the detection circuit. At this time, an analog overload current appears in the circuit, the product to be tested operates, the acquisition process is completed, and the test data is presented in the acquisition device; 1.5 Analyze the acquired test data to determine whether the operating time of the product meets the standard requirements; 1.6 Interval of 3 min or the time required to re-close the product to be tested, which may be longer for the thermal release; 1.7 After the interval time reaches the expected time, manually operate the no-load operating handle of the RCBO to be tested to close the RCBO to be tested 1 - 2 times. Confirm that the no-load closing and opening of the product are normal. After confirming that the product is normal, place the no-load operating handle in the open position; 1.8 Start the data acquisition system, close the short - circuit switch of the detection circuit, and turn on the test main circuit. At this time, use a closing mechanism that meets the relevant standard requirements to perform a closing operation on the no - load operating handle of the RCBO to be tested. After the tested product is connected to the circuit, due to the existence of the overload current, the tested product automatically trips, completing the first closing and tripping operation during the product detection process, and completing the test data acquisition. Read the relevant data to determine whether the tested product meets the standard requirements; 1.9 Repeat steps 1.6 - 1.8 two more times continuously. After the data is confirmed to meet or not meet the standard requirements, complete the test detection of the instantaneous tripping action characteristics of the first pole of the RCBO with two current circuits. During the entire detection process, the leakage - tripping operating handle of the RCBO to be tested does not act and always remains in the closed state, and the test is successful; 1.10 Disconnect the wiring and replace it with the next pole of the product to be tested; 1.11 After all the required values of the detection circuit are adjusted, select wires related to the rated current of the product to be tested according to the detection standard requirements, and determine the length of the wires used with reference to the values given in the standard. Connect the RCBO to be tested to the position D of the detection circuit. Connect the N - phase incoming line terminal of the RCBO to be tested to the power incoming line terminal of the detection circuit, and connect the N - phase load terminal of the RCBO to be tested to the front end of the adjustable impedance used to adjust the current below the rated short - circuit current in the detection circuit; then connect the N - pole incoming line terminal of the detection circuit to the A - phase incoming line terminal of the RCBO to be tested, and then connect the rear end of the adjustable impedance used to adjust the current below the rated short - circuit current in the detection circuit to the A - phase load terminal of the RCBO to be tested. Close the tested product, and the product wiring is completed; 1.12 Repeat all steps 1.3 - 1.9. Complete the test detection of the first product for this detection item, and replace the product (the maximum number of samples to be tested for this detection is three, and the minimum number is one) until the entire detection process is completed; 2. For RCBOs with four current circuits: 2.1 First, according to the rated short - circuit capacity index marked on the product, the impedance for adjusting the rated short - circuit current for each phase, and the adjustable impedance for adjusting the current below the rated short - circuit current, reach the numerical value of the product's rated short - circuit capacity index, as well as the test current value and power factor required for the detection; After all the required values of the detection circuit are adjusted, select the wire related to the rated current of the product under test according to the requirements of the detection standard, and determine the length of the wire used with reference to the given values in the standard. Connect the RCBO to be tested to the position D of the detection circuit. Connect the phase A incoming line terminal of the RCBO to be tested to the power incoming line terminal of the detection circuit, and connect the phase A load terminal of the RCBO to be tested to the front end of the adjustable impedance used to adjust the current lower than the rated short-circuit current in the detection circuit. Then connect the N-pole incoming line terminal of the detection circuit to the phase N incoming line terminal of the RCBO to be tested, and connect the back end of the adjustable impedance used to adjust the current lower than the rated short-circuit current in the detection circuit to the phase N load terminal of the RCBO to be tested. Close the product under test, and the wiring of the product is completed. 2.3 Determine the acquisition range and acquisition time length of the acquisition device according to the rated voltage U0 (phase-neutral line, measured by the voltage sensor Ur) and the test current (measured by the current sensor I) of the product to be detected, and start the acquisition device. The data acquisition system is ready. 2.4 Close the short-circuit switch of the detection circuit to connect the detection circuit. At this time, an analog overload current appears in the circuit, the product under test operates, the acquisition process is completed, and the test data is presented in the acquisition device. 2.5 Analyze the acquired test data to determine whether the operating time of the product meets the standard requirements. 2.6 Intervals of 3 min or the time required to re-close the product under test, which may be longer for the thermal release. 2.7 After the interval time reaches the expected time, manually operate the no-load operating handle of the RCBO to be tested to close the RCBO to be tested 1 - 2 times. Confirm that the no-load closing and opening of the product are normal. After confirming that the product is normal, place the no-load operating handle in the open position. 2.8 Start the data acquisition system, close the short-circuit switch of the detection circuit to connect the test main circuit. At this time, use a closing mechanism that meets the relevant standard requirements to close the no-load operating handle of the RCBO to be tested. After the product under test is connected to the circuit, due to the existence of the overload current, the product under test automatically trips, completing the first closing and opening operation during the product detection process, and completing the test data acquisition. Read the relevant data to determine whether the product under test meets the standard requirements. 2.9 Repeat steps 1.6 - 1.8 two more times continuously. After the data is confirmed to meet or not meet the standard requirements, complete the test detection of the instantaneous tripping action characteristics of the first pole of the RCBO with two current loops. During the entire detection process, the leakage operating handle of the RCBO to be tested does not operate and always remains closed, and the test is successful. 2.10 Remove the wiring and replace the next pole of the product under test. After all the required values of the detection circuit are adjusted, select the wire related to the rated current of the product under test according to the requirements of the detection standard, and determine the length of the wire used with reference to the given values in the standard. Connect the RCBO to be tested to the position where D is located in the detection circuit. Connect the phase B incoming line terminal of the RCBO to be tested to the power incoming line terminal of the detection circuit, and connect the phase B load terminal of the RCBO to be tested to the front end of the adjustable impedance used in the detection circuit to adjust the current below the rated short-circuit current. Then connect the N-pole incoming line terminal of the detection circuit to the phase N incoming line terminal of the RCBO to be tested, and then connect the rear end of the adjustable impedance used in the detection circuit to adjust the current below the rated short-circuit current to the phase N load terminal of the RCBO to be tested. Close the product under test, and the product wiring is completed. 2.12 Repeat steps 2.3 to 2.10 to complete the detection of the second protection pole of the product under test. 2.13 Connect the RCBO to be tested to the position where D is located in the detection circuit. Connect the phase C incoming line terminal of the RCBO to be tested to the power incoming line terminal of the detection circuit, and connect the phase C load terminal of the RCBO to be tested to the front end of the adjustable impedance used in the detection circuit to adjust the current below the rated short-circuit current. Then connect the N-pole incoming line terminal of the detection circuit to the phase N incoming line terminal of the RCBO to be tested, and then connect the rear end of the adjustable impedance used in the detection circuit to adjust the current below the rated short-circuit current to the phase N load terminal of the RCBO to be tested. Close the product under test, and the product wiring is completed. 2.14 Repeat steps 2.3 to 2.9 to complete the detection of the third protection pole of the product under test. 2.15 Connect the RCBO to be tested to the position where D is located in the detection circuit. Connect the phase N incoming line terminal of the RCBO to be tested to the power incoming line terminal of the detection circuit, and connect the phase N load terminal of the RCBO to be tested to the front end of the adjustable impedance used in the detection circuit to adjust the current below the rated short-circuit current. Then connect the N-pole incoming line terminal of the detection circuit to the phase A incoming line terminal (or phase B incoming line terminal and phase C incoming line terminal) of the RCBO to be tested, and then connect the rear end of the adjustable impedance used in the detection circuit to adjust the current below the rated short-circuit current to the phase A load terminal (or phase B load terminal and phase C load terminal) of the RCBO to be tested. Close the product under test, and the product wiring is completed. 2.16 Repeat all steps from 2.3 to 2.9. Complete the test detection of the first product for this detection item. Replace the product (the maximum number of samples to be detected for this detection is three, and the minimum number is one) until all the detection processes are completed. 2.17 Turn off the test power supply, remove the test wires, and the detection process is completed. If there is a shield on the RCBO under test, the shield needs to be removed when connecting the RCBO under test to the detection circuit.

[0011] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Each component mentioned in the present invention is a common technique in the existing art. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A method for detecting the instantaneous action characteristics of RCBO, characterized in that: The following steps are involved: 1) Install the detection circuit and adjust the impedance of each phase for adjusting the rated short-circuit current, and the adjustable impedance for adjusting the current lower than the rated short-circuit current, to achieve the product's rated short-circuit capacity index value, as well as the test current value and power factor required for detection; 2) Select a wire of appropriate length and rated current, and connect the RCBO to be tested to the detection circuit; 3) Determine the acquisition range and acquisition time of the acquisition equipment according to the rated voltage and test current of the RCBO to be tested, and start the acquisition equipment; 4) Close the short-circuit connector switch in the detection circuit to turn on the detection circuit. At this time, the simulated overload current appears in the circuit, the RCBO to be tested is actuated, the acquisition process is completed, and the test data is presented in the acquisition device; 5) Analyze the collected test data to determine whether the action time meets the standard requirements. After the interval time reaches the expected time, manually operate the no-load operating handle of the RCBO to be tested to close the RCBO to be tested 1~2 times to confirm that the product is normal in no-load closing and opening. After confirming that the product is normal, put the no-load operating handle in the open position; 6) Start the data acquisition system and close the short-circuit connector switch in the detection circuit. At this time, use the closing mechanism that meets the relevant requirements of the standard to close the no-load operating handle of the RCBO to be tested. After the RCBO to be tested is connected to the circuit, the RCBO to be tested automatically opens due to the existence of overload current, completing the first closing and opening operation in the product testing process, and completing the test data collection, reading the relevant data, and determining whether the tested product meets the standard requirements; 7) Repeat steps 5 and 6 twice. After the data is confirmed to meet or not meet the standard requirements, the test of the instantaneous tripping action characteristics of the first pole of the RCBO to be tested is completed. During the entire test process, the leakage action handle of the RCBO to be tested does not act and remains in a closed state. The test is successful; 8) Remove the wiring, replace the other poles of the RCBO to be tested, and perform the test operation according to the above steps; 9) Repeat the above steps 1-9 to test the RCBOs of different current loops.

2. A method for detecting the instantaneous action characteristics of RCBO according to claim 1, characterized in that: The power supply of the detection circuit in step 1 is a three-phase four-wire incoming line, wherein the three-phase line is connected to a short-circuit switch, and each phase line has an impedance for adjusting the rated short-circuit power supply for each phase, the RCBO to be tested is connected below the short-circuit switch, a voltage sensor is provided on the RCBO to be tested, a current sensor and an adjustable impedance for adjusting a current lower than the rated short-circuit current are provided at the load end outlet of the RCBO to be tested, and the N-phase line of the power supply passes through the N-phase incoming line terminal and the N-phase load terminal of the RCBO to be tested.

3. A method for detecting the instantaneous action characteristics of RCBO according to claim 2, characterized in that: In step 2, the A-phase incoming line terminal of the RCBO to be tested is connected to the A-phase line of the power supply, the A-phase load terminal of the RCBO to be tested is connected to the front end of the adjustable impedance for adjusting the current lower than the rated short-circuit current, the N-phase incoming line terminal of the RCBO to be tested is connected to the N-phase line of the power supply, and the N-phase load terminal of the RCBO to be tested is connected to the rear end of the adjustable impedance for adjusting the current lower than the rated short-circuit current.

4. A method for detecting the instantaneous action characteristics of RCBO according to claim 3, characterized in that: In step 8, the maximum number of samples to be tested is three, and the minimum number is one.

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