Detection system and method for current transformer secondary side open circuit prevention protector

Abstract

The invention provides a detection system and method for a current transformer secondary side open circuit prevention protector, which is applied to the technical field of current transformers and comprises a power supply module, a current transformer, a protector to be detected, an acquisition module, an analog switch and a testing and recording module. The power supply module supplies power to the current transformer. The analog switch is controlled to be turned on, and the acquisition module is used for acquiring first to-be-tested data of the secondary side of the current transformer. And controlling the analog switch to be switched off, and acquiring second to-be-tested data of the secondary side of the current transformer by using the acquisition module. The testing and recording module calculates protection action time and protection action recovery time according to the first to-be-tested data and the second to-be-tested data, judges whether the to-be-tested protector meets detection requirements or not and generates a detection report. By controlling the analog switch, the recovery state of the secondary side of the current transformer from the open circuit state to the normal short circuit working state is simulated, the protection action time and the protection action recovery time are effectively detected, and the detection efficiency and the detection accuracy are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of current transformers, and in particular to a detection system and method for a current transformer secondary side open circuit protection device. Background Art

[0002] The current transformer is an instrument that converts the primary side large current into the secondary side small current for measurement based on the principle of electromagnetic induction. The current transformer consists of a closed iron core and a winding. The primary winding of the current transformer is connected in series with the circuit that needs to measure the current; the secondary winding of the current transformer is connected in series with the measuring instrument and the protection circuit. When the current transformer is working, its secondary circuit is always closed, so the impedance of the series coil of the measuring instrument and the protection circuit is very small, and the working state of the current transformer is close to short circuit.

[0003] When the secondary side of the current transformer is open-circuited, several thousand volts of voltage will be generated on the secondary side. The high voltage may break through the insulation of the current transformer, making the entire power distribution equipment casing electrified, and may also cause electric shock to maintenance personnel, which is life-threatening. Furthermore, sudden saturation of the core will increase the core loss of the transformer, and the core will heat up, damaging the transformer; when the core of the transformer is saturated, the measurement will be inaccurate, and the ratio difference and angle difference will increase. As a result, the secondary side open circuit protector of the current transformer came into being. When the secondary side of the current transformer is open-circuited, the secondary side open circuit protector of the current transformer quickly limits the secondary side open circuit voltage to prevent the secondary side high voltage from burning the transformer, and gives an alarm signal. When the secondary side open circuit accident of the current transformer is resolved, the normal output is quickly restored.

[0004] Based on this, timely and effective detection of the performance of the secondary side open circuit protector of the current transformer to ensure the safety of the secondary side open circuit protector of the current transformer is an urgent problem to be solved. Summary of the invention

[0005] In view of this, an embodiment of the present invention provides a detection system and method for a current transformer secondary side open circuit protection device to solve the problem that the performance of the current transformer secondary side open circuit protection device cannot be detected in a timely and effective manner.

[0006] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] The first aspect of the present invention discloses a detection system for a current transformer secondary side open circuit protection device, the system comprising: a power supply module, a current transformer, a protection device to be tested, a collection module, an analog switch, and a test and recording module;

[0008] The output end of the power module is connected to the primary side of the current transformer, and the other end of the power module is connected to the output end of the test and recording module;

[0009] The secondary side of the current transformer is connected to the protection device to be tested, and the output end of the protection device to be tested is connected to the input end of the acquisition module; the two ends of the protection device to be tested are connected in parallel with the analog switch;

[0010] The output end of the acquisition module is connected to the input end of the test and recording module;

[0011] The power supply module is used to receive the power supply instruction sent by the test and recording module, and supply power according to the power supply instruction so that the current on the secondary side of the current transformer is any target current in the power supply instruction, wherein the power supply instruction includes a plurality of target currents on the secondary side of the current transformer;

[0012] The acquisition module is used for acquiring, for each target current, first data to be tested on the secondary side of the current transformer when the analog switch is turned on, and acquiring second data to be tested on the secondary side of the current transformer when the analog switch is turned off, and sending the first data to be tested and the second data to be tested to the testing and recording module;

[0013] The testing and recording module is used to send the power supply instruction to the power supply module; and receive the first test data and the second test data corresponding to each of the target currents, calculate the protection action time and the protection action recovery time corresponding to each of the target currents, and determine whether the protection action time and the protection action recovery time meet the requirements; if it meets the requirements, determine that the protector to be tested meets the performance requirements under the current target current; when the protector to be tested meets the performance requirements under all target currents, determine that the protector to be tested meets the detection requirements, and generate a detection report.

[0014] Preferably, the power module comprises: a voltage regulating device, a current boosting device and a high current measuring device;

[0015] One end of the voltage regulating device is connected to the testing and recording module, and the other end of the voltage regulating device is connected to one end of the current boosting device;

[0016] The other end of the current boosting device is connected to the large current measuring device and is connected to the primary side of the current transformer;

[0017] The voltage regulating device is used to regulate the voltage according to each target current in the power supply instruction and transmit the regulated voltage to the current boosting device;

[0018] The current boosting device is used to adjust the current based on the voltage so that the current on the secondary side of the current transformer is any target current in the power supply instruction;

[0019] The large current measuring device is used to measure the current and send the measurement result to the voltage regulating device.

[0020] Preferably, the acquisition module includes: an alarm acquisition module, a current sensor, a current transformer load, and a voltage sensor;

[0021] The two ends of the protection device to be tested are connected in parallel to the alarm collection module;

[0022] The input end of the current sensor is connected to the protection device to be tested, and the output end of the current sensor is connected to the testing and recording module;

[0023] One end of the current transformer load is connected to the protection device to be tested, and the other end of the current transformer load is connected to one end of the voltage sensor; the other end of the voltage sensor is connected to the protection device to be tested, and the output end of the voltage sensor is connected to the testing and recording module;

[0024] The alarm collection module is used to detect the protection action of the protection device to be tested for each target current, obtain the detection result and send it to the test and recording module;

[0025] The current sensor is used for collecting, for each target current, a first current signal on the secondary side of the current transformer when the analog switch is turned on, and collecting a second current signal on the secondary side of the current transformer when the analog switch is turned off, and sending the first current signal and the second current signal to the testing and recording module;

[0026] The voltage sensor is used to collect the first voltage signal on the secondary side of the current transformer for each target current when the analog switch is turned on, and to collect the second voltage signal on the secondary side of the current transformer when the analog switch is turned off, and to send the first voltage signal and the second voltage signal to the testing and recording module.

[0027] Preferably, the alarm collection module includes: a protection action indicator, a photoelectric sensor;

[0028] The protection action indicator is connected in parallel with both ends of the protection device to be tested; the protection action indicator is connected to the test and recording module through the photoelectric sensor;

[0029] The protection action indicator is used to output a photoelectric signal when a protection action of the protection device to be tested is detected;

[0030] The photoelectric sensor is used to collect the photoelectric signal and transmit it to the testing and recording module.

[0031] Preferably, the testing and recording module comprises: a testing module and a waveform recording device;

[0032] The input end of the waveform recording device is connected to the acquisition module, and the output end of the waveform recording device is connected to the input end of the test module;

[0033] The output end of the test module is connected to the power module;

[0034] The waveform recording device is used to receive the first data to be tested and the second data to be tested corresponding to each target current sent by the acquisition module and display the waveforms; and send the first data to be tested and the second data to be tested to the test module;

[0035] The test module is used to send the power supply instruction to the power supply module; and for each of the first test data and the second test data corresponding to the target current, calculate the protection action time and the protection action recovery time, and detect whether the protector under test meets the performance requirements; when the protector under test meets the performance requirements under all target currents, it is determined that the protector under test meets the detection requirements and a detection report is generated.

[0036] The second aspect of the present invention discloses a detection method for a current transformer secondary side anti-open circuit protector, which is applied to a detection system for a current transformer secondary side anti-open circuit protector disclosed in the first aspect of the present invention. The method comprises:

[0037] Sending a power supply instruction to a power supply module through a testing and recording module, and the power supply module supplies power based on each target current in the power supply instruction, wherein the power supply instruction includes the target currents of the secondary sides of multiple current transformers;

[0038] For each target current, the analog switch is controlled to be turned on, and the acquisition module is used to acquire the first data to be measured on the secondary side of the current transformer; and the analog switch is controlled to be turned off, and the acquisition module is used to acquire the second data to be measured on the secondary side of the current transformer;

[0039] Calculate the protection action time and the protection action recovery time according to the first data to be tested and the second data to be tested by using the test and recording module;

[0040] When both the protection action time and the protection action recovery time meet the requirements, it is determined that the protector to be tested meets the performance requirements, wherein the protector to be tested is the current transformer secondary side anti-open circuit protector;

[0041] If the protector to be tested meets the performance requirements under all target currents, it is determined that the protector to be tested meets the detection requirements, and a detection report is generated.

[0042] Preferably, the collecting of the first data to be measured on the secondary side of the current transformer by using the collecting module includes:

[0043] Using the current sensor in the acquisition module to acquire the first current signal of the secondary side of the current transformer;

[0044] Using the voltage sensor in the acquisition module to acquire a first voltage signal on the secondary side of the current transformer;

[0045] The first current signal and the first voltage signal are determined as first data to be tested.

[0046] Preferably, the calculating the protection action time and the protection action recovery time according to the first data to be tested and the second data to be tested by the testing and recording module includes:

[0047] Using the testing and recording module to draw a current and voltage waveform diagram according to a first current signal and a first voltage signal in the first data to be tested, and a second current signal and a second voltage signal in the second data to be tested;

[0048] Based on the current and voltage waveform diagram, calculate the time when the current on the secondary side of the current transformer changes from a sinusoidal waveform current to a linear current, which is recorded as a first start time, and calculate the time when the voltage on the secondary side of the current transformer changes from a linear voltage to a sudden voltage, which is recorded as a first stop time;

[0049] Calculate the difference between the first stop time and the first start time to obtain a protection action time;

[0050] Calculate the time when the voltage on the secondary side of the current transformer is a sudden voltage according to the current and voltage waveform diagram, which is recorded as the second start time, and calculate the time when the current on the secondary side of the current transformer is changed from the straight current to the sinusoidal current, which is recorded as the second stop time;

[0051] The difference between the second stop time and the second start time is calculated to obtain the protection action recovery time.

[0052] Preferably, after calculating the protection action time and the protection action recovery time according to the first data to be tested and the second data to be tested, the method further includes:

[0053] Determining whether the protection action time is less than the rated protection time, and determining whether the protection action recovery time is less than the rated protection recovery time;

[0054] If the protection action time is less than the rated protection time, and the protection action recovery time is less than the rated protection recovery time, it is determined that the protector to be tested meets the performance requirements;

[0055] If the protection action time is not less than the rated protection time, and / or the protection action recovery time is not less than the rated protection recovery time, it is determined that the protector to be tested does not meet the performance requirements.

[0056] Preferably, the method further comprises:

[0057] If the alarm collection module in the collection module detects the protection action of the protector to be tested and outputs a photoelectric signal, it is determined that the protector to be tested meets the performance requirements.

[0058] Based on the above-mentioned embodiment of the present invention, a detection system and method for a current transformer secondary side anti-open circuit protector is provided, and the system includes a power module, a current transformer, a protector to be tested, an acquisition module, an analog switch, and a test and recording module. The power module supplies power to the current transformer. The analog switch is controlled to be turned on, and the first test data of the secondary side of the current transformer is collected by the acquisition module. The analog switch is controlled to be turned off, and the second test data of the secondary side of the current transformer is collected by the acquisition module. The test and recording module calculates the protection action time and the protection action recovery time according to the first test data and the second test data, determines whether the protector to be tested meets the detection requirements and generates a detection report. After opening the analog switch, the analog switch is suddenly closed to simulate the recovery state of the secondary side of the current transformer from the open circuit state to the normal short circuit working state, which effectively verifies the protection action time and the protection action recovery time of the protector to be tested, and improves the detection efficiency and detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0060] Figure 1 A first schematic diagram of a detection system for a current transformer secondary side open circuit protection device provided by an embodiment of the present invention;

[0061] Figure 2 A second schematic diagram of a detection system for a current transformer secondary side open circuit protection device provided by an embodiment of the present invention;

[0062] Figure 3 A third schematic diagram of a detection system for a current transformer secondary side open circuit protection device provided by an embodiment of the present invention;

[0063] Figure 4A fourth schematic diagram of a detection system for a current transformer secondary side open circuit protection device provided by an embodiment of the present invention;

[0064] Figure 5 A schematic diagram of a test module provided in an embodiment of the present invention;

[0065] Figure 6 A flow chart of a detection method for a current transformer secondary side open circuit protection device provided by an embodiment of the present invention;

[0066] Figure 7 A flowchart for calculating the protection action time and the protection action recovery time provided by an embodiment of the present invention;

[0067] Figure 8 A first current and voltage waveform diagram provided by an embodiment of the present invention;

[0068] Fig. 9 A second current and voltage waveform diagram provided by an embodiment of the present invention;

[0069] Fig.10 A third current and voltage waveform diagram provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0070] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0071] In this application, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0072] As can be seen from the background technology, the performance of the secondary side open circuit protection device of the current transformer needs to be tested in a timely and effective manner to ensure the safety of maintenance personnel and to protect the current transformer from excessive damage. Therefore, an effective and efficient detection method is urgently needed to detect the performance of the secondary side open circuit protection device of the current transformer in a timely and effective manner.

[0073] Therefore, an embodiment of the present invention provides a detection system and method for an open circuit protection device on the secondary side of a current transformer. The system includes a power module, a current transformer, a protection device to be tested, an acquisition module, an analog switch, and a test and recording module. The power module supplies power to the current transformer. The analog switch is controlled to be turned on, and the first test data on the secondary side of the current transformer is collected by the acquisition module. The analog switch is controlled to be turned off, and the second test data on the secondary side of the current transformer is collected by the acquisition module. The test and recording module calculates the protection action time and the protection action recovery time according to the first test data and the second test data, determines whether the protection device to be tested of the current transformer meets the detection requirements, and generates a detection report. By suddenly closing the analog switch after opening the analog switch, the secondary side of the simulated current transformer is converted from an open circuit state to a normal short circuit working state. The protection action time and the protection action recovery time of the protection device to be tested are effectively checked, the purpose of automatically detecting the protection device to be tested is achieved, and the detection efficiency and detection accuracy are improved.

[0074] See also Figure 1 , shows a first schematic diagram of a detection system for a current transformer secondary side anti-open circuit protector provided in an embodiment of the present invention, the detection system comprising: a power supply module 1, a current transformer 2, a protector to be tested 3, an acquisition module 4, an analog switch 5 and a test and recording module 6.

[0075] Specifically, the output end of the power module 1 is connected to the primary side of the current transformer 2, and the other end of the power module 1 is connected to the output end of the test and recording module 6. The secondary side of the current transformer 2 is connected to the protection device 3 to be tested, and the output end of the protection device 3 to be tested is connected to the input end of the acquisition module 4; the two ends of the protection device 3 to be tested are connected in parallel with the analog switch 5. The output end of the acquisition module 4 is connected to the input end of the test and recording module 6.

[0076] It should be noted that the power supply module 1 is used to receive the power supply instruction sent by the test and recording module 6, and supply power according to the power supply instruction, so that the current on the secondary side of the current transformer 2 is any target current in the power supply instruction.

[0077] The power supply instruction includes target currents on the secondary sides of multiple current transformers.

[0078] That is, the testing and recording module 6 sends a power supply instruction to the power supply module 1 , wherein the power supply instruction indicates that the power supply module 1 needs to provide different power supplies so that the current on the secondary side of the current transformer 2 is the target current.

[0079] In a specific application process, the power supply module 1 can supply power according to the power supply instruction, so that the current on the secondary side of the current transformer 2 is the target current included in the power supply instruction.

[0080] For example, the power module 1 needs to provide a first power supply so that the current on the secondary side of the current transformer 2 is 5% of the rated current; the power module 1 needs to provide a second power supply so that the current on the secondary side of the current transformer 2 is 20% of the rated current; the power module 1 needs to provide a third power supply so that the current on the secondary side of the current transformer 2 is 100% of the rated current; the power module 1 needs to provide a fourth power supply so that the current on the secondary side of the current transformer 2 is 120% of the rated current. The rated current is determined by the test and recording module 6.

[0081] It can be understood that making the current on the secondary side of the current transformer 2 the target current included in the power supply instruction in turn so as to achieve the purpose of detecting the protector to be tested under different current environments helps to improve the accuracy and reliability of the detection.

[0082] Specifically, the acquisition module 4 is used to collect the first data to be tested on the secondary side of the current transformer 2 for each target current when the analog switch 5 is opened, and to collect the second data to be tested on the secondary side of the current transformer 2 when the analog switch 5 is closed, and send the first data to be tested and the second data to be tested to the testing and recording module 6.

[0083] It should be noted that by controlling the analog switch 5 to be in an open state, the open circuit state of the current transformer 2 is simulated, and by controlling the analog switch 5 to be in a closed state, the recovery state of the current transformer 2 (that is, the normal working state, that is, close to the short circuit state) is simulated.

[0084] That is to say, when the current on the secondary side of the current transformer 2 is each target current, by controlling the opening and closing of the analog switch 5, the acquisition module 4 is used to collect the first test data and the second test data at this time, and the first test data and the second test data are sent to the testing and recording module 6, so that the testing and recording module 6 can judge whether the protector 3 to be tested meets the detection requirements when the current on the secondary side of the current transformer 2 is the current target current based on the first test data and the second test data at this time.

[0085] For example, when the current on the secondary side of the current transformer 2 is 5% of the rated current, the analog switch 5 is controlled to be opened and closed, the acquisition module 4 is used to acquire the first data to be tested and the second data to be tested, and the first data to be tested and the second data to be tested are sent to the test and recording module 6.

[0086] When the current on the secondary side of the current transformer 2 is 20% of the rated current, the analog switch 5 is controlled to be opened and closed, and the acquisition module 4 is used to acquire the first data to be tested and the second data to be tested, and the first data to be tested and the second data to be tested are sent to the test and recording module 6.

[0087] When the current on the secondary side of the current transformer 2 is 100% of the rated current, the analog switch 5 is controlled to be opened and closed, the acquisition module 4 is used to acquire the first data to be tested and the second data to be tested, and the first data to be tested and the second data to be tested are sent to the test and recording module 6.

[0088] When the current on the secondary side of the current transformer 2 is 120% of the rated current, the analog switch 5 is controlled to be opened and closed, and the acquisition module 4 is used to acquire the first data to be tested and the second data to be tested, and the first data to be tested and the second data to be tested are sent to the test and recording module 6.

[0089] It can be understood that collecting the first data to be tested and the second data to be tested under various current environments is helpful to more accurately detect the protector 3 to be tested, thereby improving the accuracy of the detection.

[0090] Specifically, the testing and recording module 6 is used to send a power supply instruction to the power supply module 1; and receive the first test data and the second test data corresponding to each target current, calculate the protection action time and the protection action recovery time corresponding to each target current, and judge whether the protection action time and the protection action recovery time meet the requirements; if it meets the requirements, it is determined that the protector 3 to be tested meets the performance requirements under the current target current; when the protector 3 to be tested meets the performance requirements under all target currents, it is determined that the protector 3 to be tested meets the detection requirements, and a detection report is generated.

[0091] It should be noted that the testing and recording module 6 can specifically generate a power supply instruction according to the basic information of each component in the detection system.

[0092] It can be understood that the test and recording module 6 receives the first test data and the second test data corresponding to each target current sent by the acquisition module 4, calculates the protection action time and the protection action recovery time corresponding to each target current, and judges whether the protection device 3 to be tested meets the performance requirements under the current target current conditions according to the protection action time and the protection action recovery time. If and only if the protection device 3 to be tested meets the performance requirements under all target current conditions, it is finally determined that the protection device 3 to be tested meets the detection requirements, and a detection report is generated according to the detection process.

[0093] In an embodiment of the present application, a power supply module supplies power to a current transformer. The analog switch is controlled to be turned on, and the acquisition module is used to collect the first data to be tested on the secondary side of the current transformer. The analog switch is controlled to be turned off, and the acquisition module is used to collect the second data to be tested on the secondary side of the current transformer. The test and recording module calculates the protection action time and the protection action recovery time according to the first data to be tested and the second data to be tested, determines whether the protector to be tested of the current transformer meets the detection requirements and generates a detection report. By suddenly closing the analog switch after opening the analog switch, the secondary side of the simulated current transformer is converted from an open circuit state to a normal short circuit working state. The protection action time and the protection action recovery time of the protector to be tested are effectively checked, the purpose of automatically detecting the protector to be tested is achieved, and the detection efficiency and accuracy are improved.

[0094] Combine the following Figure 2 , the power module 1 is described in detail. Figure 2 , shows a second schematic diagram of a detection system for a current transformer secondary side anti-open circuit protector provided in an embodiment of the present invention.

[0095] Specific combination Figure 2 As shown, the power module 1 includes a voltage regulating device 11 , a current increasing device 12 and a large current measuring device 13 .

[0096] One end of the voltage regulator 11 is connected to the test and recording module 6 , and the other end of the voltage regulator 11 is connected to one end of the current booster 12 . The other end of the current booster 12 is connected to the high current measuring device 13 and to the primary side of the current transformer 2 .

[0097] It should be noted that the voltage regulating device 11 is used to adjust the voltage according to each target current in the power supply instruction and transmit the adjusted voltage to the current boosting device 12. The current boosting device 12 is used to adjust the current based on the adjusted voltage transmitted by the voltage regulating device 11, so that the current on the secondary side of the current transformer 2 is any target current in the power supply instruction.

[0098] It can be understood that the voltage regulating device 11 regulates the voltage supplied to the current boosting device 12 so that the current of the current transformer 2 reaches any target current in the power supply instruction.

[0099] For example, the voltage regulating device 11 regulates the voltage supplied to the current boosting device 12 so that the current of the current transformer 2 reaches 5%, 20%, 100%, and 120% of the rated current, respectively.

[0100] It should be noted that the large current measuring device 13 is used to measure the current and send the measurement result to the voltage regulating device 11. The current value of the large current measuring device 13 is fed back to the voltage regulating device 11. If the current of the current transformer 2 does not reach any target current in the power supply instruction, the voltage regulating device 11 continues to adjust the voltage and transmits the adjusted voltage to the current boosting device 12, so that the current boosting device 12 adjusts the current based on the adjusted voltage, so as to achieve the purpose of making the current of the current transformer 2 reach any target current in the power supply instruction.

[0101] That is, the measurement result obtained by the large current measuring device 13 when measuring the current will be transmitted to the voltage regulating device 11. This is usually done by means of electrical signals or digital communication, so that the voltage regulating device 11 can adjust the output voltage level according to the change of the current.

[0102] In the embodiment of the present application, the voltage regulating device 11 regulates the voltage according to the power supply instruction, and the current boosting device regulates the current according to the regulated voltage to apply a suitable current to the current transformer. Furthermore, the current is measured by a large current measuring device so that the voltage regulating device can adjust the output voltage level according to the change of the current. The reliability of the power supply of the inspection system is effectively guaranteed, and a suitable power supply environment is provided for detecting the protector to be tested.

[0103] Combine the following Figure 3 , the acquisition module 4 is described in detail. Figure 3 , shows a third schematic diagram of a detection system for a current transformer secondary side anti-open circuit protector provided in an embodiment of the present invention.

[0104] Specific combination Figure 3 As shown in the figure, the acquisition module includes: an alarm acquisition module 41 , a current sensor 42 , a current transformer load 43 , and a voltage sensor 44 .

[0105] Two ends of the protection device 3 to be tested are connected in parallel to the alarm collection module 41. The input end of the current sensor 42 is connected to the protection device 3 to be tested, and the output end of the current sensor 42 is connected to the test and recording module 6.

[0106] One end of the current transformer load 43 is connected to the protector 3 to be tested, and the other end of the current transformer load 43 is connected to one end of the voltage sensor 44 ; the other end of the voltage sensor 44 is connected to the protector 3 to be tested, and the output end of the voltage sensor 44 is connected to the testing and recording module 6 .

[0107] Specifically, the current transformer load 43 is a resistor.

[0108] It should be noted that the current sensor 42 is connected in series to the protection device 3 to be tested, and the current sensor 42 is used for current signals; the voltage sensor 44 is connected in parallel to both ends of the protection device 3 to be tested, and the voltage sensor 44 is used for collecting voltage signals.

[0109] It can be understood that the current sensor 42 is used to collect the first current signal on the secondary side of the current transformer 2 for each target current when the analog switch 5 is opened, and to collect the second current signal on the secondary side of the current transformer 2 when the analog switch 5 is closed, and send the first current signal and the second current signal to the testing and recording module 6.

[0110] That is to say, for the current transformer when the current is any target current, when the analog switch 5 is opened, the open circuit state of the current transformer 2 is simulated, and the first current signal on the secondary side of the current transformer 2 in the open circuit state is collected through the current sensor 42; when the analog switch 5 is closed, the recovery state of the current transformer 2 (that is, the normal working state, that is, close to the short circuit state) is simulated, and the second current signal on the secondary side of the current transformer 2 in the recovery state is collected through the current sensor 42, and the first current signal and the second current signal are sent to the testing and recording module 6.

[0111] It should be noted that the voltage sensor 44 is used to collect the first voltage signal on the secondary side of the current transformer 2 for each target current when the analog switch 5 is opened, and to collect the second voltage signal on the secondary side of the current transformer 2 when the analog switch 5 is closed, and send the first voltage signal and the second voltage signal to the testing and recording module 6.

[0112] That is to say, for the current transformer when the current is any target current, when the analog switch 5 is opened, the open circuit state of the current transformer 2 is simulated, and the first voltage signal on the secondary side of the current transformer 2 in the open circuit state is collected through the voltage sensor 44; when the analog switch 5 is closed, the recovery state of the current transformer 2 (that is, the normal working state, that is, close to the short circuit state) is simulated, and the second voltage signal on the secondary side of the current transformer 2 in the recovery state is collected through the voltage sensor 44, and the first voltage signal and the second voltage signal are sent to the testing and recording module 6.

[0113] Specifically, the alarm collection module 41 is used to detect the protection action of the protection device 3 to be tested for each target current, obtain the detection result and send it to the test and recording module 6. Figure 3 As shown, the alarm collection module 41 includes: a protection action indicator 411 and a photoelectric sensor 412 .

[0114] The protection action indicator 411 is connected in parallel with two ends of the protection device 3 to be tested; the protection action indicator 411 is connected to the testing and recording module 6 via a photoelectric sensor 412 .

[0115] It should be noted that the protection action indicator 411 is used to output a photoelectric signal when the protection action of the protection device 3 to be tested is detected. The photoelectric sensor 412 is used to collect the photoelectric signal and transmit it to the test and recording module 6.

[0116] In an embodiment of the present application, a current sensor is used to detect the current when the current transformer is in an open circuit state, and the current in the recovery state when the current transformer is converted from the open circuit state to the normal short circuit working state. A voltage sensor is used to detect the voltage when the current transformer is in an open circuit state, and the voltage in the recovery state when the current transformer is converted from the open circuit state to the normal short circuit working state. In addition, a protection action indicator and a photoelectric sensor are used to detect the protection action of the protector to be tested. Comprehensive detection of the first detection data of the protector to be tested when the current transformer is in an open circuit state and the second detection data in the recovery state helps the test and recording module to accurately calculate the protection action time and the protection action recovery time of the protector to be tested, further ensuring the accuracy of the detection results.

[0117] Combine the following Figure 4 , the test and recording module 6 is described in detail. Figure 4 , shows a fourth schematic diagram of a detection system for a current transformer secondary side anti-open circuit protector provided in an embodiment of the present invention.

[0118] Specific combination Figure 4 As shown in the figure, the testing and recording module 6 includes: a testing module 61 and a waveform recording device 62 .

[0119] The input end of the waveform recording device 62 is connected to the acquisition module 4 , and the output end of the waveform recording device 62 is connected to the input end of the test module 61 ; the output end of the test module 61 is connected to the power supply module 1 .

[0120] It should be noted that the waveform recording device 62 is used to receive the first data to be tested and the second data to be tested corresponding to each target current sent by the acquisition module 4 and display the waveforms; and send the first data to be tested and the second data to be tested to the test module 61.

[0121] It can be understood that the waveform recording device 62 is used to record the first data to be tested and the second data to be tested corresponding to each target current, and to display the first data to be tested and the second data to be tested in waveform.

[0122] The test module 61 is used to send a power supply instruction to the power supply module 1; and for the first test data and the second test data corresponding to each target current, calculate the protection action time and the protection action recovery time, and detect whether the protector 3 to be tested meets the performance requirements; when the protector 3 to be tested meets the performance requirements under all target currents, it is determined that the protector 3 to be tested meets the detection requirements, and a detection report is generated.

[0123] It is important to note that, see Figure 5 The module schematic diagram of the test module is shown. The test module 61 is specifically used for setting parameters, controlling the test process, extracting test data and obtaining a test report.

[0124] Specifically, the test module 61 includes: a parameter setting module 611 , an instrument control module 612 and a parameter determination module 613 .

[0125] The parameter setting module 611 is connected to the acquisition module 4 in communication; the instrument control module 612 is connected to the waveform recording device 62 in communication; and the parameter determination module 613 is connected to the power supply module 1 and the waveform recording device 62 respectively.

[0126] The parameter setting module 611 is used to set the parameters of the current sensor 42 (such as the proportionality coefficient), the parameters of the voltage sensor 44 (such as the proportionality coefficient) and the parameters of the photoelectric sensor 412 (such as the sensitivity coefficient) in the acquisition module 4.

[0127] In practical applications, setting the parameters in the acquisition module 4 helps to select a suitable range of the waveform recording device 62 so that the waveform recording device 62 can clearly display the waveforms of the first and second test data collected by the acquisition module 4 .

[0128] The instrument control module 612 is used to drive the waveform recording device 62 to enable data exchange between the waveform recording device 62 and the test module 61 (such as the waveform recording device 62 sends the first test data and the second test data to the test module 61). The instrument control module 612 is also used to receive and record the first test data and the second test data, and to generate and output a test report.

[0129] The parameter determination module 613 is used to generate a power supply instruction according to the parameters of the acquisition module 4 and the measuring range of the waveform recording device 62 and send it to the power supply module 1. Specifically, the current amplitude parameter is determined according to the parameters of the current sensor 42 and the measuring range of the waveform recording device 62, and based on this, the power supply instruction is generated and sent to the power supply module 1.

[0130] Furthermore, the parameter determination module 613 is also used to calculate the protection action time and the protection action recovery time according to the proportional coefficient of the current sensor 42, the proportional coefficient of the voltage sensor 44 and the measuring range of the waveform recording device 62. And the detection logic of the protection action indicator 411 is determined according to the sensitivity coefficient of the photoelectric sensor 412, the proportional coefficient of the voltage sensor 44 and the measuring range of the waveform recording device 62.

[0131] In the embodiment of the present application, the waveform recording device is combined to display the waveform of the first detection data and the second detection data collected by the acquisition module, which is helpful to display the data more intuitively. Furthermore, the parameters of each component in the detection system are set by the test module to determine the protection action time and the protection action recovery time, which is conducive to accurately and reliably testing the protector to be tested and improving the reliability of the test results. The automated detection method also improves the detection efficiency.

[0132] See also Figure 6 , shows a flow chart of a detection method for a current transformer secondary side open circuit protection device provided by an embodiment of the present invention, and the method is applied to a detection system for a current transformer secondary side open circuit protection device provided by the above-mentioned embodiment of the present invention. The method comprises:

[0133] Step S601: sending a power supply instruction to the power supply module through the testing and recording module, and the power supply module supplies power based on each target current in the power supply instruction.

[0134] The power supply instruction includes target currents of the secondary sides of multiple current transformers.

[0135] It should be noted that the user sets the relevant parameters of the detection in advance through the test and record module, and uses the test and record module to generate the power supply instruction based on the relevant parameters of the detection.

[0136] In the specific implementation of step S601, a power supply instruction is sent to the power supply module through the testing and recording module, and the power supply module supplies power so that the current on the secondary side of the current transformer is each target current in the power supply instruction.

[0137] For example, the power module supplies power based on the power supply instruction so that the current on the secondary side of the current transformer is 5% of the rated current; the power module supplies power based on the power supply instruction so that the current on the secondary side of the current transformer is 20% of the rated current; the power module supplies power based on the power supply instruction so that the current on the secondary side of the current transformer is 100% of the rated current; the power module supplies power based on the power supply instruction so that the current on the secondary side of the current transformer is 120% of the rated current. Among them, the rated current is determined by the test and recording module.

[0138] Step S602: for each target current, control the analog switch to open, and use the acquisition module to collect the first data to be measured on the secondary side of the current transformer; and control the analog switch to close, and use the acquisition module to collect the second data to be measured on the secondary side of the current transformer.

[0139] In the process of specifically implementing step S602, when the power supply module supplies power based on the power supply instruction so that the current on the secondary side of the current transformer is each target current in the power supply instruction, the analog switch is controlled to open and close for each target current to simulate the open circuit state and short circuit state (i.e., protection state) of the current transformer.

[0140] Specifically, the analog switch is controlled to open, and the current sensor of the acquisition module is used to acquire the first current signal on the secondary side of the current transformer; the voltage sensor in the acquisition module is used to acquire the first voltage signal on the secondary side of the current transformer; and the first current signal and the first voltage signal are determined as the first data to be measured.

[0141] Control the analog switch to close, use the current sensor of the acquisition module to collect the second current signal on the secondary side of the current transformer; use the voltage sensor in the acquisition module to collect the second voltage signal on the secondary side of the current transformer; determine the second current signal and the second voltage signal as the second data to be measured.

[0142] Step S603: using the testing and recording module to calculate the protection action time and the protection action recovery time according to the first data to be tested and the second data to be tested.

[0143] In the specific implementation of step S603, the test and recording module is used to draw current and voltage waveforms according to the first test data and the second test data acquired by the acquisition module, and the protection action time and the protection action recovery time are calculated based on the current and voltage waveforms.

[0144] It should be noted that the specific implementation process of using the test and recording module to calculate the protection action time and the protection action recovery time according to the first test data and the second test data is shown in the embodiment of the present invention. Figure 7 The content shown.

[0145] Step S604: When both the protection action time and the protection action recovery time meet the requirements, it is determined that the protector to be tested meets the performance requirements.

[0146] Among them, the protector to be tested is a current transformer secondary side open circuit protection device.

[0147] In a specific embodiment, after the protection action time and the protection action recovery time are calculated, it is determined whether the protection action time is less than the rated protection time, and it is determined whether the protection action recovery time is less than the rated protection recovery time.

[0148] If the protection action time is less than the rated protection time, and the protection action recovery time is less than the rated protection recovery time, it is determined that the protector under test meets the performance requirements. The rated protection time and the rated protection recovery time are pre-set by the user.

[0149] If the protection action time is not less than the rated protection time, and / or the protection action recovery time is not less than the rated protection recovery time, it is determined that the protector under test does not meet the performance requirements.

[0150] In the specific implementation of step S604, when the protection action time is less than the rated protection time, and the protection action recovery time is less than the rated protection recovery time, it is determined that the protector to be tested meets the performance requirements.

[0151] Step S605: If the protector to be tested meets the performance requirements under all target currents, it is determined that the protector to be tested meets the test requirements, and a test report is generated.

[0152] For example: when the current on the secondary side of current transformer 2 is 5% of the rated current, the protector to be tested meets the performance requirements, and when the current on the secondary side of current transformer 2 is 20% of the rated current, the protector to be tested meets the performance requirements, and when the current on the secondary side of current transformer 2 is 100% of the rated current, the protector to be tested meets the performance requirements, and when the current on the secondary side of current transformer 2 is 120% of the rated current, the protector to be tested meets the performance requirements, it can be finally determined that the protector to be tested meets the detection requirements.

[0153] In the specific implementation of step S605, when the protector to be tested meets the performance requirements under all target currents, it is determined that the protector to be tested meets the detection requirements; when the protector to be tested does not meet the performance requirements under any target current, it is determined that the protector to be tested does not meet the detection requirements (i.e., fails). A detection report is generated based on the detection process, and the detection report is output when an output instruction is received.

[0154] In some embodiments, if the alarm collection module in the collection module detects the protection action of the protector to be tested and outputs a photoelectric signal, it is determined that the protector to be tested meets the performance requirements.

[0155] It should be noted that the alarm collection module includes a protection action indicator and a photoelectric sensor. When the protection action indicator detects the protection action signal of the protector to be tested, the protection action indicator lights up, and the photoelectric signal is output to the test and recording module through the photoelectric sensor. Based on this, it is determined that the protector to be tested meets the performance requirements.

[0156] In an embodiment of the present invention, a power supply module is used to supply power to the current transformer. The analog switch is controlled to be turned on, and the acquisition module is used to acquire the first data to be tested on the secondary side of the current transformer. The analog switch is controlled to be turned off, and the acquisition module is used to acquire the second data to be tested on the secondary side of the current transformer. By testing and recording the calculated protection action time and the protection action recovery time, it is determined whether the protector to be tested of the current transformer meets the detection requirements and a detection report is generated. By suddenly closing the analog switch after opening the analog switch, the secondary side of the simulated current transformer is converted from an open circuit state to a normal short circuit working state. The protection action time and the protection action recovery time of the protector to be tested are effectively checked, the purpose of automatically detecting the protector to be tested is achieved, and the detection efficiency and accuracy are improved.

[0157] Above Figure 6 For a specific process of calculating the protection action time and the protection action recovery time according to the first test data and the second test data by using the test and recording module, see Figure 7 , shows a flowchart of calculating the protection action time and the protection action recovery time provided by an embodiment of the present invention.

[0158] Step S701: using the testing and recording module, draw current and voltage waveform diagrams according to the first current signal and the first voltage signal in the first test data, and the second current signal and the second voltage signal in the second test data.

[0159] In the process of specifically implementing step S701, the testing and recording module receives the first data to be tested and the second data to be tested sent by the acquisition module, and uses the testing and recording module to draw current and voltage waveform diagrams according to the first current signal and the first voltage signal in the first data to be tested, and draw current and voltage waveform diagrams according to the second current signal and the second voltage signal in the second data to be tested.

[0160] Specifically, the current and voltage waveforms are drawn according to the first current signal and the first voltage signal in the first test data, such as Figure 8 The first current and voltage waveform diagram shown; draw the current and voltage waveform diagram according to the second current signal and the second voltage signal in the second measured data, such as Fig. 9 The second current and voltage waveforms are shown.

[0161] Step S702: Based on the current and voltage waveform diagrams, calculate the time when the current on the secondary side of the current transformer changes from a sinusoidal waveform current to a linear current, recorded as the first start time, and calculate the time when the voltage on the secondary side of the current transformer changes from a linear voltage to a sudden voltage, recorded as the first stop time.

[0162] It should be noted that if Figure 8The current curve in the first current and voltage waveform diagram shown, when the current waveform changes from a sine waveform to a straight line, indicates that the current on the secondary side of the current transformer changes from a normal current to an open circuit current.

[0163] like Figure 8 The voltage curve in the first current and voltage waveform diagram shown, when the voltage waveform changes from a straight line to a sudden change, indicates that the voltage on the secondary side of the current transformer changes from an open circuit voltage to a small voltage in a protection state.

[0164] In the process of specifically implementing step S702, the time when the current on the secondary side of the current transformer changes from a sinusoidal waveform current to a linear current is determined based on the current and voltage waveform diagrams, which is recorded as the first start time, and the time when the voltage on the secondary side of the current transformer changes from a linear voltage to a sudden voltage is determined, which is recorded as the first stop time.

[0165] Step S703: Calculate the difference between the first stop time and the first start time to obtain the protection action time.

[0166] In the specific implementation of step S703, the difference between the first stop time and the first start time is calculated to obtain the protection action time. Figure 8 The t1 shown in the first current and voltage waveform diagram is recorded as the protection action time.

[0167] Step S704: Calculate the time when the voltage on the secondary side of the current transformer changes to a sudden voltage based on the current and voltage waveform diagram, recorded as the second start time, and calculate the time when the current on the secondary side of the current transformer changes from a linear current to a sinusoidal current, recorded as the second stop time.

[0168] It should be noted that if Fig. 9 The current curve in the second current and voltage waveform diagram shown, when the current waveform changes from a straight line to a sine waveform, indicates that the current on the secondary side of the current transformer changes from an open circuit current to a normal current.

[0169] like Fig. 9 The voltage curve in the second current and voltage waveform diagram shown, when the voltage waveform changes from a sudden change shape to a straight line shape, indicates that the voltage on the secondary side of the current transformer changes from an open circuit voltage to a small voltage in a protection state.

[0170] In the process of implementing step S704, the time when the voltage on the secondary side of the current transformer is a sudden voltage is determined according to the current and voltage waveform diagram, which is recorded as the second start time, and the time when the current on the secondary side of the current transformer changes from a linear current to a sinusoidal waveform current is determined, which is recorded as the second stop time.

[0171] Step S705: Calculate the difference between the second stop time and the second start time to obtain the protection action recovery time.

[0172] In the specific implementation of step S705, the difference between the second stop time and the second start time is calculated to obtain the protection action recovery time. Fig. 9 The t2 shown in the second current and voltage waveform diagram is recorded as the protection action recovery time.

[0173] It is understandable that, combined with Figure 8 and Fig. 9 The protection action time is calculated as follows: for the current waveform and voltage waveform collected when simulating an open circuit on the secondary side, the protection action time is calculated from the time when the secondary current of the current transformer changes from normal current to open circuit current to the time when the secondary voltage changes from open circuit voltage to a small voltage under the protection state, t1. Record t1 as the protection action time.

[0174] The calculation method of the protection action recovery time is as follows: for the current waveform and voltage waveform collected when the simulated secondary changes from open circuit to normal, count from the sudden change of the voltage on the secondary side of the current transformer to the time t2 when the secondary current of the current transformer changes from open circuit current to a normal sinusoidal waveform, and record t2 as the protection action recovery time.

[0175] In some specific embodiments, the testing and recording module receives the photoelectric signal sent by the photoelectric sensor and draws a waveform diagram based on the photoelectric signal, such as Fig.10 As shown, Fig.10 The current curve and voltage curve are shown in FIG. Fig.10 The content shown is that when the output voltage of the photoelectric sensor changes from a low level to a high level, the protection action indicator light will turn on.

[0176] In the embodiment of the present invention, the accuracy of the detection result is improved by drawing current and voltage waveform diagrams and calculating the protection action time and the protection action recovery time.

[0177] In summary, the present invention provides a detection system and method for an open circuit protection device on the secondary side of a current transformer. The system includes a power module, a current transformer, a protection device to be tested, an acquisition module, an analog switch, and a test and recording module. The power module supplies power to the current transformer. The analog switch is controlled to be turned on, and the first test data on the secondary side of the current transformer is collected by the acquisition module. The analog switch is controlled to be turned off, and the second test data on the secondary side of the current transformer is collected by the acquisition module. The test and recording module calculates the protection action time and the protection action recovery time according to the first test data and the second test data, determines whether the protection device to be tested of the current transformer meets the detection requirements, and generates a detection report. By suddenly closing the analog switch after opening the analog switch, the secondary side of the simulated current transformer is converted from an open circuit state to a normal short circuit working state. The protection action time and the protection action recovery time of the protection device to be tested are effectively checked, the purpose of automatically detecting the protection device to be tested is achieved, and the detection efficiency and detection accuracy are improved.

[0178] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without creative work.

[0179] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0180] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A detection system for a current transformer secondary side open circuit protection device, characterized in that: The system includes: a power supply module, a current transformer, a protection device to be tested, a collection module, an analog switch, and a test and recording module; The output end of the power module is connected to the primary side of the current transformer, and the other end of the power module is connected to the output end of the test and recording module; The secondary side of the current transformer is connected to the protection device to be tested, and the output end of the protection device to be tested is connected to the input end of the acquisition module; the two ends of the protection device to be tested are connected in parallel with the analog switch; The output end of the acquisition module is connected to the input end of the test and recording module; The power supply module is used to receive the power supply instruction sent by the test and recording module, and supply power according to the power supply instruction so that the current on the secondary side of the current transformer is any target current in the power supply instruction, wherein the power supply instruction includes a plurality of target currents on the secondary side of the current transformer; The acquisition module is used for acquiring, for each target current, first data to be tested on the secondary side of the current transformer when the analog switch is turned on, and acquiring second data to be tested on the secondary side of the current transformer when the analog switch is turned off, and sending the first data to be tested and the second data to be tested to the testing and recording module; The testing and recording module is used to send the power supply instruction to the power supply module; and receive the first test data and the second test data corresponding to each of the target currents, calculate the protection action time and the protection action recovery time corresponding to each of the target currents, and determine whether the protection action time and the protection action recovery time meet the requirements; if it meets the requirements, determine that the protector to be tested meets the performance requirements under the current target current; when the protector to be tested meets the performance requirements under all target currents, determine that the protector to be tested meets the detection requirements, and generate a detection report.

2. The system according to claim 1, characterized in that The power module comprises: a voltage regulating device, a current increasing device and a large current measuring device; One end of the voltage regulating device is connected to the testing and recording module, and the other end of the voltage regulating device is connected to one end of the current boosting device; The other end of the current boosting device is connected to the large current measuring device and is connected to the primary side of the current transformer; The voltage regulating device is used to regulate the voltage according to each target current in the power supply instruction and transmit the regulated voltage to the current boosting device; The current boosting device is used to adjust the current based on the voltage so that the current on the secondary side of the current transformer is any target current in the power supply instruction; The large current measuring device is used to measure the current and send the measurement result to the voltage regulating device.

3. The system according to claim 1, characterized in that The acquisition module includes: an alarm acquisition module, a current sensor, a current transformer load, and a voltage sensor; The two ends of the protection device to be tested are connected in parallel to the alarm collection module; The input end of the current sensor is connected to the protection device to be tested, and the output end of the current sensor is connected to the testing and recording module; One end of the current transformer load is connected to the protection device to be tested, and the other end of the current transformer load is connected to one end of the voltage sensor; the other end of the voltage sensor is connected to the protection device to be tested, and the output end of the voltage sensor is connected to the testing and recording module; The alarm collection module is used to detect the protection action of the protection device to be tested for each target current, obtain the detection result and send it to the test and recording module; The current sensor is used for collecting, for each target current, a first current signal on the secondary side of the current transformer when the analog switch is turned on, and collecting a second current signal on the secondary side of the current transformer when the analog switch is turned off, and sending the first current signal and the second current signal to the testing and recording module; The voltage sensor is used to collect the first voltage signal on the secondary side of the current transformer for each target current when the analog switch is turned on, and to collect the second voltage signal on the secondary side of the current transformer when the analog switch is turned off, and to send the first voltage signal and the second voltage signal to the testing and recording module.

4. The system according to claim 3, characterized in that The alarm collection module includes: a protection action indicator and a photoelectric sensor; The protection action indicator is connected in parallel with two ends of the protection device to be tested; the protection action indicator is connected to the test and recording module through the photoelectric sensor; The protection action indicator is used to output a photoelectric signal when a protection action of the protector to be tested is detected; The photoelectric sensor is used to collect the photoelectric signal and transmit it to the testing and recording module.

5. The system according to claim 1, characterized in that The testing and recording module comprises: a testing module and a waveform recording device; The input end of the waveform recording device is connected to the acquisition module, and the output end of the waveform recording device is connected to the input end of the test module; The output end of the test module is connected to the power module; The waveform recording device is used to receive the first data to be tested and the second data to be tested corresponding to each target current sent by the acquisition module and display the waveforms; and send the first data to be tested and the second data to be tested to the test module; The test module is used to send the power supply instruction to the power supply module; and for each of the first test data and the second test data corresponding to the target current, calculate the protection action time and the protection action recovery time, and detect whether the protector under test meets the performance requirements; when the protector under test meets the performance requirements under all target currents, it is determined that the protector under test meets the detection requirements and a detection report is generated.

6. A detection method for a current transformer secondary side open circuit protection device, characterized in that: Applied to the detection system according to any one of claims 1 to 5, the method comprises: Sending a power supply instruction to a power supply module through a testing and recording module, and the power supply module supplies power based on each target current in the power supply instruction, wherein the power supply instruction includes the target currents of the secondary sides of multiple current transformers; For each target current, the analog switch is controlled to be turned on, and the acquisition module is used to acquire the first data to be measured on the secondary side of the current transformer; and the analog switch is controlled to be turned off, and the acquisition module is used to acquire the second data to be measured on the secondary side of the current transformer; Calculate the protection action time and the protection action recovery time according to the first data to be tested and the second data to be tested by using the test and recording module; When both the protection action time and the protection action recovery time meet the requirements, it is determined that the protector to be tested meets the performance requirements, wherein the protector to be tested is the current transformer secondary side anti-open circuit protector; If the protector to be tested meets the performance requirements under all target currents, it is determined that the protector to be tested meets the test requirements, and a test report is generated.

7. The method according to claim 6, characterized in that The method of collecting the first data to be measured on the secondary side of the current transformer by using the collection module includes: Using the current sensor in the acquisition module to acquire the first current signal of the secondary side of the current transformer; Using the voltage sensor in the acquisition module to acquire a first voltage signal on the secondary side of the current transformer; The first current signal and the first voltage signal are determined as first data to be tested.

8. The method according to claim 6, characterized in that The using the testing and recording module to calculate the protection action time and the protection action recovery time according to the first data to be tested and the second data to be tested includes: Using the testing and recording module to draw a current and voltage waveform diagram according to a first current signal and a first voltage signal in the first data to be tested, and a second current signal and a second voltage signal in the second data to be tested; Based on the current and voltage waveform diagram, calculate the time when the current on the secondary side of the current transformer changes from a sinusoidal waveform current to a linear current, which is recorded as a first start time, and calculate the time when the voltage on the secondary side of the current transformer changes from a linear voltage to a sudden voltage, which is recorded as a first stop time; Calculate the difference between the first stop time and the first start time to obtain a protection action time; Calculate the time when the voltage on the secondary side of the current transformer is a sudden voltage according to the current and voltage waveform diagram, which is recorded as the second start time, and calculate the time when the current on the secondary side of the current transformer is changed from the straight current to the sinusoidal current, which is recorded as the second stop time; The difference between the second stop time and the second start time is calculated to obtain the protection action recovery time.

9. The method according to claim 6, characterized in that After calculating the protection action time and the protection action recovery time according to the first to-be-tested data and the second to-be-tested data, the method further includes: Determining whether the protection action time is less than the rated protection time, and determining whether the protection action recovery time is less than the rated protection recovery time; If the protection action time is less than the rated protection time, and the protection action recovery time is less than the rated protection recovery time, it is determined that the protector to be tested meets the performance requirements; If the protection action time is not less than the rated protection time, and / or the protection action recovery time is not less than the rated protection recovery time, it is determined that the protector to be tested does not meet the performance requirements.

10. The method according to claim 6, characterized in that The method further comprises: If the alarm collection module in the collection module detects the protection action of the protector to be tested and outputs a photoelectric signal, it is determined that the protector to be tested meets the performance requirements.

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