A device for confirming whether the secondary circuit is short-circuited correctly when the primary equipment is energized

Abstract

The present invention discloses a device for confirming whether a secondary circuit is short-circuited correctly when a primary device is energized, comprising a host and a slave; the host comprises a first power supply module, a first clock timing module, a first storage module, a human-computer interaction module, a first communication module, a current transformer, a voltage acquisition module, a first current acquisition module, a first analog-to-digital conversion module, a relay, a relay control module, an isolation module and a first processor module; the slave comprises a second power supply module, a second clock timing module, a second storage module, a second communication module, an open current clamp, a second current acquisition module, a second analog-to-digital conversion module and a second processor module. The present invention improves the safety level of production, ensures the safety and reliability of secondary personnel when operating the running current circuit, and avoids personal and equipment accidents caused by misoperation. Improve the work efficiency of secondary maintenance personnel, and avoid spending a lot of time and effort on confirming the correctness of the current circuit.

Description

Technical Field

[0001] The invention relates to the technical field of transformer substations, and in particular to a device for confirming whether a secondary circuit of a primary device is short-circuited correctly when it is energized. Background Art

[0002] In the secondary professional work of substations, it is often necessary to short-circuit the secondary current circuit in operation, such as the protection and fault recording devices on the secondary side will be disabled without power outage of the primary equipment. Short-circuiting the current circuit in operation is extremely risky, and a slight carelessness will lead to serious equipment tripping accidents. At the current stage, the substation equipment is complicated, and the inconsistency between the reference drawings and the actual site is serious. In particular, there are many minefields in some "old" substations that have been around for a long time, which brings great challenges and risks to the work of secondary personnel. At present, although the secondary personnel strictly go to the site for investigation in advance, and try their best to understand the equipment status and sort out the secondary circuit, due to some objective reasons, such as the inconsistency between the drawings and the actual situation mentioned above, the lack of cable hanging signs, and the wrong circuit caps, it still brings troubles to the secondary personnel. The conventional operation method is to directly implement short-circuiting based on the secondary safety ticket compiled according to the on-site investigation results and the judgment of the secondary personnel. This method can no longer meet the needs of safe production. In view of this, it is proposed to develop a device for confirming whether the secondary circuit is short-circuited correctly when the primary equipment is energized. The device is used to judge the correctness of the short-circuit of the secondary operating current circuit while meeting the needs of safe production. This method can effectively improve the work quality and reduce safety risks. It also has certain innovations in the field of relay protection technology, reduces the operational risks of relay protection personnel, and improves safety.

[0003] As the construction of the power grid continues to improve, secondary work has gradually increased. Technical transformation, infrastructure, calibration and other work involving short-circuiting of operating current loops is still a major problem for secondary personnel. In recent years, there have been many equipment tripping incidents caused by misoperation of current loops in the power grid system, which seriously affected the normal operation of the power grid.

[0004] Two accident cases are introduced. Case 1: During the commissioning of a 500kV automatic safety device at a 500kV substation, due to inadequate on-site safety measures, two points of grounding occurred in the secondary current circuit of the second set of protection of the line. Due to the voltage difference of the ground potential, zero-sequence current was generated, which caused the zero-sequence inverse time protection to operate and trip the circuit breakers on both sides of the line. Case 2: When the relay protection personnel of a power supply company were checking the dead zone of the current transformer at a substation, the maintenance personnel blindly believed in the drawings (the drawings were inconsistent with the actual wiring), and the short-circuit current caused the protection to trip.

[0005] The prior art has the following disadvantages:

[0006] 1. Short-circuiting the current circuit in operation is extremely risky, and any carelessness will lead to serious equipment tripping accidents.

[0007] 2. Due to some objective reasons, such as inconsistency between drawings and actual conditions, missing cable labels, incorrect circuit caps, etc., the work of secondary personnel faces great challenges and risks.

[0008] 3. The conventional operating method is to directly implement short-circuiting based on the secondary safety measures ticket compiled according to the on-site investigation results and the judgment of secondary personnel. This method can no longer meet the needs of safe production.

[0009] 4. There is no special device to assist the secondary personnel in confirming whether the short-circuited secondary circuit is correct. The judgment is entirely based on the experience of the secondary personnel and the on-site investigation.

[0010] 5. As secondary work gradually increases, the probability of accidents also gradually increases. Many equipment tripping incidents caused by misoperation of current circuits have occurred in the power grid system, seriously affecting the normal operation of the power grid. Summary of the invention

[0011] In view of this, in order to solve the above-mentioned problems in the prior art, the present invention proposes a device for confirming whether the secondary circuit is correctly short-circuited when the primary equipment is energized, which can improve the level of safe production, ensure the safety and reliability of secondary personnel when operating the operating current circuit, and avoid personal and equipment accidents caused by misoperation.

[0012] The present invention solves the above problems by the following technical means:

[0013] A device for confirming whether the secondary circuit is short-circuited correctly when the primary device is energized, including a master device and a slave device;

[0014] The host comprises:

[0015] A first power supply module, used to provide power to the entire host;

[0016] The first clock synchronization module has a synchronization function and is used to synchronize the voltage data and current data collected by the host and the slave to ensure that the time of these data is consistent;

[0017] The first storage module is used to store host test data and save test results;

[0018] A human-computer interaction module, used for information exchange between the user and the device;

[0019] A first communication module, used for exchanging data with the slave via wireless communication;

[0020] A current transformer, used to collect current data flowing through the parallel resistor interface 1 and the parallel resistor interface 2;

[0021] A voltage acquisition module, used to amplify or reduce the voltage analog data at both ends of the parallel resistor interface 1 and the parallel resistor interface 2 to a size suitable for conversion by the first analog-to-digital conversion module;

[0022] The first current acquisition module is electrically connected to the current transformer and amplifies the small signal current analog data collected by the current transformer to a size suitable for conversion by the first analog-to-digital conversion module;

[0023] A first analog-to-digital conversion module is electrically connected to the voltage acquisition module and the first current acquisition module, and is used to convert the collected voltage and current analog data into digital data that can be processed by the first processor module;

[0024] A relay, used to determine whether the resistance of the adjustable resistance box is connected in parallel to the secondary current loop by turning the relay on and off;

[0025] A relay control module, electrically connected to the relay, for controlling the on and off of the relay;

[0026] An isolation module, electrically connected to the first analog-to-digital conversion module, is used to isolate the circuit of the voltage and current data acquisition part of the device from the circuit of other parts, to ensure that the device is not interfered by the outside world, to improve the anti-interference ability, and to not affect the normal operation of the secondary current loop when the device itself is damaged;

[0027] The first processor module is electrically connected to the first power supply module, the first clock synchronization module, the first storage module, the human-computer interaction module, the first communication module, the isolation module, and the relay control module, and is used to quickly process and analyze various data, including the voltage and current data of the first analog-to-digital conversion module and the slave data received by the first communication module;

[0028] The slave comprises:

[0029] A second power supply module, used to provide power to the entire slave;

[0030] The second clock synchronization module has a synchronization function and is used to synchronize the voltage data and current data collected by the slave and the host to ensure that the time of these data is consistent;

[0031] The second storage module is used to store slave test data and save test results;

[0032] The second communication module is used to exchange data with the host through wireless communication;

[0033] Open current clamp, used to collect current data flowing through the secondary current loop;

[0034] The second current acquisition module is electrically connected to the open current clamp and is used to amplify the small signal current analog data collected by the open current clamp to a size suitable for conversion by the second analog-to-digital conversion module;

[0035] A second analog-to-digital conversion module is electrically connected to the second current acquisition module and is used to convert the collected current analog data into digital data that can be processed by the second processor module;

[0036] The second processor module is electrically connected to the second power supply module, the second clock synchronization module, the second storage module, the second communication module, and the second analog-to-digital conversion module, respectively, and is used to quickly process and analyze various data, including current data of the second analog-to-digital conversion module and host data received by the second communication module.

[0037] Furthermore, the first power module includes:

[0038] A first rechargeable lithium battery, used to provide power to the entire host;

[0039] The first power management module is used to manage the charging and discharging of the first rechargeable lithium battery, and has the functions of overvoltage protection and overcurrent protection; it measures the remaining power of the first rechargeable lithium battery and converts the voltage of the first rechargeable lithium battery into a suitable voltage to power the entire host.

[0040] Furthermore, the first clock synchronization module has the synchronization functions of GPS synchronization and 1588 network synchronization.

[0041] Furthermore, the human-computer interaction module includes:

[0042] Keyboard, used to set device parameters and control the operating status of the device;

[0043] LCD screen, used to display real-time test data;

[0044] Indicator lights are used to indicate several important operating states of the device.

[0045] Furthermore, the first communication module is a LORA communication module.

[0046] Furthermore, the first processor module uses a high-performance ARM processor with 4 cores, 1.2 GHz and 1G RAM.

[0047] Furthermore, the second power supply module includes:

[0048] The second rechargeable lithium battery is used to provide power to the entire slave;

[0049] The second power management module is used to manage the charging and discharging of the second rechargeable lithium battery, has the functions of overvoltage protection and overcurrent protection, measures the remaining power of the second rechargeable lithium battery, and converts the voltage of the second rechargeable lithium battery into a suitable voltage to power the entire slave.

[0050] Furthermore, the second clock synchronization module has the synchronization functions of GPS synchronization and 1588 network synchronization.

[0051] Furthermore, the second communication module is a LORA communication module.

[0052] Furthermore, the second processor module uses a high-performance ARM processor with 4 cores, 1.2 GHz and 1G RAM.

[0053] Compared with the prior art, the beneficial effects of the present invention include at least:

[0054] 1. Improve the safety level of production, ensure the safety and reliability of secondary personnel when operating the running current loop, and avoid personal and equipment accidents caused by misoperation. Improve the work efficiency of secondary maintenance personnel, and avoid spending a lot of time and effort on confirming the correctness of the current loop. Bring indirect economic benefits, save labor costs, and reduce power outage time.

[0055] 2. Due to the use of the host and slave mode, the collected voltage and current data are time-stamped, which can ensure that the analyzed data are collected at the same time. This can greatly improve the accuracy of the device. The device can determine whether the wiring is correct and find the two terminals that need to be short-circuited by analyzing the voltage and current data at the same time, and the device will not make misjudgments due to the data being analyzed not at the same time.

[0056] 3. The communication between the host and the slave uses the LORA wireless communication method. Compared with other wireless communication methods, it has strong anti-interference ability, long transmission distance, excellent wall penetration performance, and can ensure the real-time data transmission.

[0057] 4. It has a mechanism to prevent the parallel resistance from being connected incorrectly and a mechanism to prevent misoperation. When the parallel resistance is connected incorrectly, the device will automatically control the relay to disconnect the parallel resistance immediately. In case of an operation error, the emergency stop button will be pressed and the device will stop working and the relay will remain in the disconnected state. This can effectively prevent the device itself from affecting the normal operation of the power grid.

[0058] 5. Both the host and the slave are powered by lithium batteries, which makes the device easy to carry and does not require an external power supply when used on site, greatly improving the convenience of using the device.

[0059] 6. The host only needs to connect two test wires to the CT terminal box, and the slave only needs to clamp the open current clamp on the current loop. The wiring is fast and convenient. After the wires are connected, one-click test is performed, and the test results can be obtained in just 3 seconds, which greatly improves the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0061] Figure 1 It is a circuit schematic diagram of the host of the present invention;

[0062] Figure 2 It is a circuit diagram of the first LORA communication module of the present invention;

[0063] Figure 3 is a circuit diagram of a first processor module of the present invention;

[0064] Figure 4 is a circuit diagram of a first storage module of the present invention;

[0065] Figure 5 is a circuit diagram of the first current acquisition module of the present invention;

[0066] Figure 6 is a circuit diagram of a voltage acquisition module of the present invention;

[0067] Figure 7 is a circuit diagram of a first power management module of the present invention;

[0068] Figure 8 is a circuit diagram of the isolation module of the present invention;

[0069] Fig. 9 is a circuit diagram of a relay control module and a relay of the present invention;

[0070] Fig.10 is a circuit diagram of a first analog-to-digital conversion module of the present invention;

[0071] Fig.11 is a circuit diagram of a human-computer interaction module of the present invention;

[0072] Fig.12 is a circuit diagram of the first clock timing module of the present invention;

[0073] Fig.13 It is a circuit schematic diagram of the slave of the present invention;

[0074] Fig.14 It is a schematic diagram of the use of the device for confirming whether the secondary circuit is correctly short-circuited when the primary equipment is energized according to the present invention. DETAILED DESCRIPTION

[0075] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be pointed out that the described embodiments are only part of the embodiments of the present invention, not all of them. 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.

[0076] The present invention provides a device for confirming whether a secondary circuit of a primary device is short-circuited correctly when the primary device is powered on, comprising a host and a slave;

[0077] like Figure 1-Figure 12 As shown, the host includes:

[0078] First, rechargeable lithium battery: provides power to the entire host, allowing the host to work continuously for 8 hours and can be fully charged in just 2 hours.

[0079] The first power management module is electrically connected to the first rechargeable lithium battery, manages the charging and discharging of the first rechargeable lithium battery, has functions such as overvoltage protection and overcurrent protection, can also measure the remaining power of the first rechargeable lithium battery, and convert the voltage of the first rechargeable lithium battery into a suitable voltage to power the entire host.

[0080] The first clock synchronization module: It has the functions of GPS synchronization and 1588 network synchronization, and synchronizes the voltage data and current data collected by the host and the slave to ensure the consistency of the time of these data, so as to improve the accuracy of data analysis.

[0081] The first storage module is used to store host test data and save test results.

[0082] Human-computer interaction module: includes a keyboard, LCD screen and indicator lights. The keyboard can set device parameters and control the operating status of the device; the LCD screen is used to display real-time test data, etc.; the indicator lights are used to indicate several important operating states of the device.

[0083] The first LORA communication module: used to exchange data with the slave through wireless communication.

[0084] Current transformer: can collect current data flowing through parallel resistor interface 1 and parallel resistor interface 2.

[0085] Voltage acquisition module: amplifies or reduces the voltage analog data at both ends of the parallel resistor interface 1 and the parallel resistor interface 2 to a size suitable for conversion by the first analog-to-digital conversion module.

[0086] The first current acquisition module is electrically connected to the current transformer and amplifies the small signal current analog data acquired by the current transformer to a size suitable for conversion by the first analog-to-digital conversion module.

[0087] The first analog-to-digital conversion module is electrically connected to the voltage acquisition module and the first current acquisition module respectively, and converts the collected voltage and current analog data into digital data that can be processed by the first processor module.

[0088] Relay: The on and off of the relay can determine whether the resistance of the adjustable resistance box is connected in parallel to the secondary current loop.

[0089] Relay control module: electrically connected to the relay, used to control the on and off of the relay.

[0090] Isolation module: electrically connected to the first analog-to-digital conversion module, isolating the circuit of the voltage and current data acquisition part of the device from the circuit of other parts, Figure 1 The dotted line in the middle is the isolation zone. The main function of the isolation module is to ensure that the device is not interfered by the outside world, improve the anti-interference ability, and do not affect the normal operation of the secondary current circuit when the device itself is damaged.

[0091] The first processor module is electrically connected to the first power management module, the first clock synchronization module, the first storage module, the human-computer interaction module, the first LORA communication module, the isolation module, and the relay control module. It uses a 4-core 1.2GHz, 1G memory high-performance ARM processor, which can quickly process and analyze various data, such as: voltage and current data of the first analog-to-digital conversion module, slave data received by the first LORA communication module, etc.

[0092] like Fig.13 As shown, the slave includes:

[0093] The second rechargeable lithium battery: provides power to the entire slave, allowing the slave to work continuously for 8 hours and only takes 2 hours to be fully charged.

[0094] The second power management module is electrically connected to the second rechargeable lithium battery, manages the charging and discharging of the second rechargeable lithium battery, has functions such as overvoltage protection and overcurrent protection, can also measure the remaining power of the second rechargeable lithium battery, and convert the voltage of the second rechargeable lithium battery into a suitable voltage to power the entire slave.

[0095] The second clock synchronization module: It has the functions of GPS synchronization and 1588 network synchronization, which can synchronize the voltage and current data collected by the slave and the host to ensure the consistency of the time of these data, so as to improve the accuracy of data analysis.

[0096] The second storage module is used to store slave test data and save test results.

[0097] The second LORA communication module: used to exchange data with the host through wireless communication.

[0098] Open current clamp: can collect current data flowing through the secondary current loop.

[0099] The second current acquisition module is electrically connected to the open current clamp and amplifies the small signal current analog data acquired by the open current clamp to a size suitable for conversion by the second analog-to-digital conversion module.

[0100] The second analog-to-digital conversion module is electrically connected to the second current acquisition module, and converts the acquired current analog data into digital data that can be processed by the second processor module.

[0101] The second processor module: is electrically connected to the second power management module, the second clock synchronization module, the second storage module, the second LORA communication module, and the second analog-to-digital conversion module respectively, and uses a 4-core 1.2GHz, 1G memory high-performance ARM processor, which can quickly process and analyze various data, such as: the current data of the second analog-to-digital conversion module, the host data received by the second LORA communication module, etc.

[0102] Each module of the slave machine is connected to the corresponding host module, and the circuit Figure 1 To.

[0103] Fig.14 This is a schematic diagram of the use of the present invention, and the use scenario is: the primary equipment of the substation does not stop power supply, and the current circuit is in operation, and the relevant secondary circuit is short-circuited in the CT terminal box.

[0104] 1. Connect the parallel resistance interface 1 and parallel resistance interface 2 of the host to the two ends of the secondary current loop CT terminal box, and clamp the open current clamp of the slave on the current loop close to the secondary monitoring and relay protection equipment.

[0105] 2. First, let the relay of the host be in the disconnected state. The voltage value of the two ends of the CT terminal box tested by the host is U, and the total current value of the secondary current loop tested by the slave is I. Based on these two data, the total impedance of the secondary current loop can be calculated as Zn, and the adjustable resistance value of the adjustable resistor box of the host can be calculated as 9*Zn.

[0106] 3. Adjust the adjustable resistance box of the host to 9*Zn, and put the relay of the host in a closed state. The shunt current value flowing through the parallel resistor interface 1 and the parallel resistor interface 2 tested by the host should be 0.1*I, and the total current value of the secondary current loop tested by the slave should be 0.9*I.

[0107] 4. If the wiring is correct, the measured shunt current value and total current should be 0.1*I and 0.9*I respectively, so the two CT terminals can be short-circuited with wires. If the wiring is incorrect, the measured shunt current value and total current are not 0.1*I and 0.9*I. The host will automatically control the relay to disconnect and prompt the wiring error, and re-search the correct CT terminal.

[0108] The present invention has the following advantages:

[0109] 1. Improve the safety level of production, ensure the safety and reliability of secondary personnel when operating the running current loop, and avoid personal and equipment accidents caused by misoperation. Improve the work efficiency of secondary maintenance personnel, and avoid spending a lot of time and effort on confirming the correctness of the current loop. Bring indirect economic benefits, save labor costs, and reduce power outage time.

[0110] 2. Due to the use of the host and slave mode, the collected voltage and current data are time-stamped, which can ensure that the analyzed data are collected at the same time. This can greatly improve the accuracy of the device. The device can determine whether the wiring is correct and find the two terminals that need to be short-circuited by analyzing the voltage and current data at the same time, and the device will not make misjudgments due to the data being analyzed not at the same time.

[0111] 3. The communication between the host and the slave uses the LORA wireless communication method. Compared with other wireless communication methods, it has strong anti-interference ability, long transmission distance, excellent wall penetration performance, and can ensure the real-time data transmission.

[0112] 4. It has a mechanism to prevent the parallel resistance from being connected incorrectly and a mechanism to prevent misoperation. When the parallel resistance is connected incorrectly, the device will automatically control the relay to disconnect the parallel resistance immediately. In case of an operation error, the emergency stop button will be pressed and the device will stop working and the relay will remain in the disconnected state. This can effectively prevent the device itself from affecting the normal operation of the power grid.

[0113] 5. Both the host and the slave are powered by lithium batteries, which makes the device easy to carry and does not require an external power supply when used on site, greatly improving the convenience of using the device.

[0114] 6. The host only needs to connect two test wires to the CT terminal box, and the slave only needs to clamp the open current clamp on the current loop. The wiring is fast and convenient. After the wires are connected, one-click test is performed, and the test results can be obtained in just 3 seconds, which greatly improves the test efficiency.

[0115] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A device for confirming whether the secondary circuit is short-circuited correctly when the primary equipment is energized, characterized in that: It includes a host and a slave; the host includes: A first power supply module, used to provide power to the entire host; The first clock synchronization module has a synchronization function and is used to synchronize the voltage data and current data collected by the host and the slave to ensure that the time of these data is consistent; The first storage module is used to store host test data and save test results; A human-computer interaction module, used for information exchange between the user and the device; A first communication module, used for exchanging data with the slave via wireless communication; A current transformer, used to collect current data flowing through the parallel resistor interface 1 and the parallel resistor interface 2; A voltage acquisition module, used to amplify or reduce the voltage analog data at both ends of the parallel resistor interface 1 and the parallel resistor interface 2 to a size suitable for conversion by the first analog-to-digital conversion module; The first current acquisition module is electrically connected to the current transformer and amplifies the small signal current analog data collected by the current transformer to a size suitable for conversion by the first analog-to-digital conversion module; A first analog-to-digital conversion module is electrically connected to the voltage acquisition module and the first current acquisition module, and is used to convert the collected voltage and current analog data into digital data that can be processed by the first processor module; A relay, used to determine whether the resistance of the adjustable resistance box is connected in parallel to the secondary current loop by turning the relay on and off; A relay control module, electrically connected to the relay, for controlling the on and off of the relay; An isolation module, electrically connected to the first analog-to-digital conversion module, for isolating the circuit of the voltage and current data acquisition part of the device from the circuit of other parts; The first processor module is electrically connected to the first power supply module, the first clock synchronization module, the first storage module, the human-computer interaction module, the first communication module, the isolation module, and the relay control module, and is used to quickly process and analyze various data, including the voltage and current data of the first analog-to-digital conversion module and the slave data received by the first communication module; The slave comprises: A second power supply module, used to provide power to the entire slave; The second clock synchronization module has a synchronization function and is used to synchronize the voltage data and current data collected by the slave and the host to ensure that the time of these data is consistent; The second storage module is used to store slave test data and save test results; The second communication module is used to exchange data with the host through wireless communication; Open current clamp, used to collect current data flowing through the secondary current loop; The second current acquisition module is electrically connected to the open current clamp and is used to amplify the small signal current analog data collected by the open current clamp to a size suitable for conversion by the second analog-to-digital conversion module; A second analog-to-digital conversion module is electrically connected to the second current acquisition module and is used to convert the collected current analog data into digital data that can be processed by the second processor module; The second processor module is electrically connected to the second power supply module, the second clock synchronization module, the second storage module, the second communication module, and the second analog-to-digital conversion module, respectively, and is used to quickly process and analyze various data, including current data of the second analog-to-digital conversion module and host data received by the second communication module; The process of confirming whether the secondary circuit is short-circuited correctly includes the following steps: 1) Connect the parallel resistance interface 1 and parallel resistance interface 2 of the host to the two ends of the secondary current loop CT terminal box, and clamp the open current clamp of the slave on the current loop close to the secondary monitoring and relay protection equipment; 2) First, let the relay of the host be in the disconnected state. The voltage value of the two ends of the CT terminal box tested by the host is U, and the total current value of the secondary current loop tested by the slave is I. Based on these two data, the total impedance of the secondary current loop is calculated to be Zn, and thus the adjustable resistance value of the adjustable resistance box of the host is calculated to be 9×Zn; 3) Adjust the adjustable resistance box of the host to 9×Zn, and make the relay of the host in the closed state. The shunt current value flowing through the parallel resistance interface 1 and the parallel resistance interface 2 tested by the host should be 0.1×I, and the total current value of the secondary current loop tested by the slave should be 0.9×I; 4) If the wiring is correct, the measured shunt current value and total current should be 0.1×I and 0.9×I respectively. Use wires to short-circuit the two CT terminals. If the wiring is incorrect, the measured shunt current value and total current are not 0.1×I and 0.9×I. The host will automatically control the relay to disconnect and prompt a wiring error. Find the correct CT terminal again.

2. The device for confirming whether the secondary circuit of a primary device is short-circuited correctly under power on condition of claim 1 is characterized in that: The first power supply module includes: a first rechargeable lithium battery, used to provide power to the entire host; a first power management module, used to manage the charging and discharging of the first rechargeable lithium battery, and has overvoltage protection and overcurrent protection functions; measures the remaining power of the first rechargeable lithium battery, and converts the voltage of the first rechargeable lithium battery into a suitable voltage to power the entire host.

3. The device for confirming whether the secondary circuit of the primary equipment is short-circuited correctly under power on condition of claim 1 is characterized in that: The first clock synchronization module has the synchronization functions of GPS synchronization and 1588 network synchronization.

4. The device for confirming whether the secondary circuit is short-circuited correctly when the primary equipment is energized according to claim 1 is characterized in that: The human-computer interaction module comprises: Keyboard, used to set device parameters and control the operating status of the device; LCD screen, used to display real-time test data; Indicator lights are used to indicate several important operating states of the device.

5. The device for confirming whether the secondary circuit of a primary device is short-circuited correctly when it is powered on according to claim 1 is characterized in that: The first communication module is a LORA communication module.

6. The device for confirming whether the secondary circuit is short-circuited correctly when the primary equipment is energized according to claim 1 is characterized in that: The first processor module uses a high-performance ARM processor with 4 cores, 1.2 GHz and 1G RAM.

7. The device for confirming whether the secondary circuit of a primary device is short-circuited correctly when it is powered on according to claim 1 is characterized in that: The second power supply module comprises: The second rechargeable lithium battery is used to provide power to the entire slave; The second power management module is used to manage the charging and discharging of the second rechargeable lithium battery, has the functions of overvoltage protection and overcurrent protection, measures the remaining power of the second rechargeable lithium battery, and converts the voltage of the second rechargeable lithium battery into a suitable voltage to power the entire slave.

8. The device for confirming whether the secondary circuit of a primary device is short-circuited correctly under power on condition of claim 1 is characterized in that: The second clock synchronization module has the synchronization functions of GPS synchronization and 1588 network synchronization.

9. The device for confirming whether the secondary circuit of a primary device is short-circuited correctly under power on condition of claim 1 is characterized in that: The second communication module is a LORA communication module.

10. The device for confirming whether the secondary circuit of a primary device is short-circuited correctly under power on condition of claim 1 is characterized in that: The second processor module uses a high-performance ARM processor with 4 cores, 1.2 GHz and 1G RAM.

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