Automatic checking device for non-full-phase protection

Abstract

The invention provides an automatic checking device for non-full-phase protection, and belongs to the technical field of power grids. The device comprises a three-phase closing relay, a three-phase tripping relay, a voltage detection device and a main control device, for any phase, the first end of the closing relay of the phase is connected with the positive terminal, and the second end of the closing relay of the phase is connected with one end, far away from the negative terminal, of the circuit breaker auxiliary switch in the closing loop of the phase; the first end of the phase tripping relay is connected with the positive electricity terminal, and the second end of the phase tripping relay is connected with one end, far away from the negative electricity terminal, of the circuit breaker auxiliary switch in the phase opening loop; the voltage detection device samples the voltage difference between the two ends of the circuit breaker auxiliary switch in each phase of opening loop; the main control device controls the action of the three-phase closing relay, and determines a first verification result of each phase according to the voltage difference between the two ends of the circuit breaker auxiliary switch in each phase opening loop; according to the invention, through controlling the closing relay and the tripping relay, accurate, efficient and rapid non-full-phase protection automatic verification can be automatically realized.

Description

Technical Field

[0001] The present invention relates to the technical field of power grids, and in particular to a non-full-phase protection automatic calibration device. Background Art

[0002] The non-full-phase protection technology is an important power system protection technology. When it detects that the power system is in a non-full-phase operation state, it determines the phases that need to be protected and takes corresponding protection actions. For example, when only phase A is operating in the power system and phases B and C are not operating, the non-full-phase protection detects this state through auxiliary contacts, activates the non-full-phase protection, and trips phase A, thereby protecting the power system.

[0003] When the system is in non-full-phase operation, negative sequence and zero sequence components will be generated in the power system, which will cause certain harm to electrical equipment, and may also cause misoperation of the system protection and reduce the stability of system operation. When the protection system detects that the current power grid is operating in a single-phase or two-phase non-full-phase state, it will enable non-full-phase protection to quickly cut off the unhealthy state of the power grid, thereby ensuring the stability of the power grid. Thus, it can be seen that the non-full-phase protection technology plays an important role in ensuring the safe and stable operation of the power system.

[0004] Since the non-full-phase protection plays an important role in ensuring the safe and stable operation of the power system, the calibration work of the non-full-phase protection is particularly important. The calibration of the non-full-phase protection is to calibrate the action time of the non-full-phase protection device within the allowable range by adjusting the time relay in the protection device, so as to ensure the rapidity and stability of the non-full-phase protection.

[0005] In the prior art, the calibration of the non-full-phase protection mainly includes: manual non-full-phase protection calibration and semi-automatic calibration; the manual non-full-phase protection test requires at least two groups of staff to cooperate closely. One party creates a non-full-phase operation condition of the power system through manual operation, and the other party records the action time of the non-full-phase protection with a remote recording device; this calibration method consumes a lot of manpower, has low work efficiency, is greatly affected by the communication signals between the two parties, is prone to generate electric arcs during manual operation, has high requirements for personnel operation, and poses safety risks to both staff and equipment. The semi-automatic calibration uses a semi-automatic calibration method with a protection calibration instrument, which reduces the labor cost to a certain extent, but the traditional electric meter has low measurement accuracy, large detection errors, requires manual phase-by-phase operation for calibration, has a long detection time, and is greatly affected by the operation level of personnel.

[0006] As can be seen from the above, the manual non-full-phase protection calibration and semi-automatic calibration in the prior art each have disadvantages and cannot achieve accurate, efficient, rapid, and low-cost calibration of the non-full-phase protection. Summary of the Invention

[0007] An embodiment of the present invention provides a non - all - phase protection automatic verification device to solve the problem that the non - all - phase protection verification in the prior art cannot meet the requirements of accurate, efficient, fast, and low - cost verification of non - all - phase protection.

[0008] An embodiment of the present invention provides a non - all - phase protection automatic verification device, including: a three - phase closing relay, a three - phase tripping relay, a voltage detection device, and a main control device;

[0009] For any one of the three phases, the first end of the closing relay of this phase is connected to the positive - power terminal, and the second end of the closing relay of this phase is connected to one end of the circuit breaker auxiliary switch in the closing loop of this phase that is far from the negative - power terminal; the first end of the tripping relay of this phase is connected to the positive - power terminal, and the second end of the tripping relay of this phase is connected to one end of the circuit breaker auxiliary switch in the opening loop of this phase that is far from the negative - power terminal;

[0010] The voltage detection device is used to sample the pressure difference between the two ends of the circuit breaker auxiliary switch in each phase opening loop;

[0011] The main control device is used to: control the three - phase closing relay to act, and determine the first verification result of the non - all - phase protection verification for each phase according to the pressure difference between the two ends of the circuit breaker auxiliary switch in each phase opening loop;

[0012] Wherein, the first verification result is qualified or unqualified.

[0013] Optionally, controlling the three - phase closing relay to act and determining the first verification result of the non - all - phase protection verification for each phase according to the pressure difference between the two ends of the circuit breaker auxiliary switch in each phase opening loop includes:

[0014] Continuously obtain the pressure difference between the two ends of the circuit breaker auxiliary switch in each phase opening loop;

[0015] For any one of the three phases, control the closing relay of this phase to close; when it is detected that the pressure difference between the two ends of the circuit breaker auxiliary switch in the opening loop of this phase meets the first preset condition, record it as the first moment; when it is detected that the pressure difference between the two ends of the circuit breaker auxiliary switch in the opening loop of this phase meets the second preset condition, record it as the second moment; if the time interval between the second moment and the first moment is within the preset time range, determine that the corresponding first verification result of this phase is qualified; otherwise, it is unqualified.

[0016] Optionally, the first preset condition is: the pressure difference between the two ends of the circuit breaker auxiliary switch in the opening loop of this phase changes from being greater than the first preset voltage to being less than the second preset voltage;

[0017] The second preset condition is: the pressure difference between the two ends of the circuit breaker auxiliary switch in the opening loop of this phase changes from being less than the second preset voltage to being greater than the first preset voltage;

[0018] Among them, the first preset voltage is greater than the second preset voltage.

[0019] Optionally, the first preset voltage is 100V and the second preset voltage is 10V.

[0020] Optionally, the voltage detection device is further configured to sample the voltage difference between both ends of the breaker auxiliary switch in each phase closing loop; the master control device is further configured to:

[0021] Determine the second verification result of the non-full-phase protection verification according to the voltage difference between both ends of the breaker auxiliary switch in each phase closing loop; wherein, the second verification result is qualified or unqualified;

[0022] Verify the first verification result according to the second verification result.

[0023] Optionally, the non-full-phase protection automatic verification device further includes: six relay driving modules; the six relay driving modules are respectively in one-to-one correspondence with the three-phase closing relays and the three-phase tripping relays, and are respectively used to drive the three-phase closing relays and the three-phase tripping relays;

[0024] The relay driving module includes: a first optocoupler, a first diode and a first resistor;

[0025] The anode of the first optocoupler is connected to the first end of the first resistor, the cathode of the first optocoupler is connected to the first grounding end, the collector of the first optocoupler is respectively connected to the first end of the coil of the corresponding relay and the anode of the first diode, and the emitter of the first optocoupler is connected to the second grounding end;

[0026] The second end of the coil of the relay corresponding to the collector of the first optocoupler and the cathode of the first diode are both connected to the DC power supply;

[0027] The second end of the first resistor is connected to the master control device.

[0028] Optionally, the non-full-phase protection automatic verification device further includes: six display modules; the six display modules are respectively in one-to-one correspondence with the six relay driving modules;

[0029] The display module includes: a light-emitting diode and a second resistor;

[0030] The anode of the light-emitting diode is connected to the second end of the first resistor in the corresponding relay driving module through the second resistor, and the cathode of the light-emitting diode is connected to the first grounding end.

[0031] Optionally, the non-full-phase protection automatic verification device further includes: a human-computer interaction module;

[0032] The human-computer interaction module is connected to the master control device.

[0033] Optionally, the master control device includes: a master control chip; the master control chip is a STM32F103 type chip.

[0034] Optionally, the master control device is further configured to:

[0035] Obtain an emergency stop signal in real time;

[0036] If an emergency stop signal is obtained, do not execute or jump out of the step of controlling the three-phase closing relay to act, and determine the first verification result of the non-full-phase protection verification for each phase according to the voltage difference between the two ends of the breaker auxiliary switch in each phase opening circuit.

[0037] An embodiment of the present invention provides a non-full-phase protection automatic verification device, including: a three-phase closing relay, a three-phase tripping relay, a voltage detection device, and a master control device; for any one of the three phases, the first end of the closing relay of this phase is connected to the positive power terminal, and the second end of the closing relay of this phase is connected to the end of the breaker auxiliary switch in this closing circuit away from the negative power terminal; the first end of the tripping relay of this phase is connected to the positive power terminal, and the second end of the tripping relay of this phase is connected to the end of the breaker auxiliary switch in this opening circuit away from the negative power terminal; the voltage detection device is used to sample the voltage difference between the two ends of the breaker auxiliary switch in each phase opening circuit; the master control device is used to: control the three-phase closing relay to act, and determine the first verification result of the non-full-phase protection verification for each phase according to the voltage difference between the two ends of the breaker auxiliary switch in each phase opening circuit; wherein, the first verification result is qualified or unqualified. In the embodiment of the present invention, the control module controls the three-phase closing relay to act to supply power to each phase closing circuit and each phase opening circuit without manual operation. At the same time, the master control device also automatically obtains the voltage difference between the two ends of the breaker auxiliary switch in each phase opening circuit through the voltage detection device, and determines the action time of the breaker auxiliary switch according to the voltage change, so as to complete the non-full-phase protection verification for each phase. No manual participation is required during the test process, and efficient, fast, and accurate non-full-phase protection automatic verification can be realized. Description of the Drawings

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0039] Figure 1 is a schematic structural diagram of a non-full-phase protection automatic verification device provided by an embodiment of the present invention;

[0040] Figure 2 is a schematic diagram of a state of the A-phase closing circuit and opening circuit provided by an embodiment of the present invention;

[0041] Figure 3 It is another state schematic diagram of the closing circuit and the opening circuit of phase A provided by the embodiment of the present invention;

[0042] Figure 4 It is a voltage timing diagram of the voltage difference between both ends of the circuit breaker auxiliary switch in the phase A opening circuit provided by the embodiment of the present invention;

[0043] Figure 5 It is a circuit schematic diagram of a relay drive module provided by the embodiment of the present invention;

[0044] Figure 6 It is a circuit schematic diagram of a display module provided by the embodiment of the present invention;

[0045] Figure 7 A circuit schematic diagram of a voltage detection unit provided by the embodiment of the present invention;

[0046] Figure 8 A circuit schematic diagram of an emergency stop input module provided by the embodiment of the present invention;

[0047] Figure 9 It is a control logic flowchart of the main control device provided by the embodiment of the present invention. Detailed implementation manners

[0048] In order to enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this solution will be clearly described below in conjunction with the accompanying drawings in the embodiments of this solution. Obviously, the described embodiments are part of the embodiments of this solution, rather than all of the embodiments. Based on the embodiments in this solution, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this solution.

[0049] The term "including" in the description and claims of this solution and the above-mentioned accompanying drawings, as well as any other variations, means "including but not limited to", and is intended to cover non-exclusive inclusion, not limited only to the examples listed in the text. In addition, terms such as "first" and "second" are used to distinguish different objects, rather than to describe a specific order.

[0050] The implementation of the present invention will be described in detail below in conjunction with specific accompanying drawings:

[0051] Figure 1 It is a structural schematic diagram of a non-full-phase protection automatic calibration device provided by the embodiment of the present invention. Refer to Figure 1, the single-phase-to-ground protection automatic calibration device includes: three-phase closing relays 11 (A-phase closing relay, B-phase closing relay, and C-phase closing relay), three-phase tripping relays 12 (A-phase tripping relay, B-phase tripping relay, and C-phase tripping relay), a voltage detection device 13, and a main control device 14;

[0052] For any one of the three phases (A-phase, B-phase, C-phase), the first end of the closing relay 11 of this phase is connected to the positive power terminal +KM, and the second end of the closing relay 11 of this phase is connected to one end of the circuit breaker auxiliary switch (DLA2) in this closing loop that is far from the negative power terminal -KM; the first end of the tripping relay 12 of this phase is connected to the positive power terminal +KM, and the second end of the tripping relay 12 of this phase is connected to one end of the circuit breaker auxiliary switch (for example, DLA1) in this tripping loop that is far from the negative power terminal -KM;

[0053] The voltage detection device 13 is used to sample the voltage difference across the two ends of the circuit breaker auxiliary switch (for example, DLA1) in each phase tripping loop;

[0054] The main control device 14 is used to: control the three-phase closing relays 11 to operate, and determine the first calibration result of the single-phase-to-ground protection calibration for each phase according to the voltage difference across the two ends of the circuit breaker auxiliary switch in each phase tripping loop;

[0055] Wherein, the first calibration result is qualified or unqualified.

[0056] It should be noted that referring to Figure 1 , one end of the circuit breaker auxiliary switch (for example, DLA2) in this closing loop that is close to the negative power terminal -KM is connected to the negative power terminal -KM through this closing coil (for example, HQA); one end of the circuit breaker auxiliary switch (for example, DLA1) in this tripping loop that is close to the negative power terminal -KM is connected to the negative power terminal -KM through this tripping coil (for example, TQA).

[0057] Referring to Figure 1 , in the embodiment of the present invention, three-phase closing relays 11 are provided corresponding to the three-phase closing loops. The main control device 14 controls the three-phase closing relays 11 to operate to realize the automatic control of the power supply of the three-phase closing loops. The automatic calibration device is connected to the system, that is, no manual wiring is required during the test process after the wiring is completed, saving human resources and ensuring the personal safety of workers. At the same time, the main control device 14 automatically obtains the voltage difference across the two ends of the circuit breaker auxiliary switch in each phase tripping loop through the voltage detection device 13, determines the action time of the circuit breaker auxiliary switch according to the voltage change, thereby completing the single-phase-to-ground protection calibration for each phase. No manual participation is required during the test process, and efficient, fast, and accurate single-phase-to-ground protection automatic calibration can be realized; at the same time, the safety of operators themselves and equipment is guaranteed, the risk of misoperation of the protection device caused by personnel accidentally touching the terminals is reduced, and the power supply reliability is improved.

[0058] Exemplarily, both the three-phase closing relay 11 and the three-phase tripping relay 12 can be connected to the corresponding equipment through banana head test leads.

[0059] It should be noted that a three-phase tripping relay 12 is provided for the corresponding three-phase tripping circuit to supply power to the tripping coil under special working conditions to achieve tripping of the corresponding phase.

[0060] In a possible implementation manner, controlling the three-phase closing relay 11 to operate and determining the first verification result of the non-full-phase protection verification for each phase according to the voltage difference between the two ends of the breaker auxiliary switch in each phase tripping circuit may include:

[0061] 1. Continuously obtain the voltage difference between the two ends of the breaker auxiliary switch in each phase tripping circuit;

[0062] 2. For any one of the three phases, control the closing relay 11 of this phase to close; when it is detected that the voltage difference between the two ends of the breaker auxiliary switch in this phase tripping circuit satisfies the first preset condition, it is recorded as the first moment; when it is detected that the voltage difference between the two ends of the breaker auxiliary switch in this phase tripping circuit satisfies the second preset condition, it is recorded as the second moment; if the time interval between the second moment and the first moment is within the preset time range, it is determined that the first verification result corresponding to this phase is qualified; otherwise, it is unqualified.

[0063] In a possible implementation manner, the first preset condition may be: the voltage difference between the two ends of the breaker auxiliary switch in this phase tripping circuit switches from being greater than the first preset voltage to being less than the second preset voltage;

[0064] The second preset condition may be: the voltage difference between the two ends of the breaker auxiliary switch in this phase tripping circuit switches from being less than the second preset voltage to being greater than the first preset voltage;

[0065] Wherein, the first preset voltage is greater than the second preset voltage.

[0066] In a possible implementation manner, the first preset voltage may be 100V and the second preset voltage may be 10V.

[0067] In the embodiment of the present invention, taking phase A as an example, refer to Figure 2 , when the three phases are in the off position, the breaker auxiliary switch DLA2 in the closing circuit of phase A is closed, and the breaker auxiliary switch DLA1 in the tripping circuit of phase A is opened; at this time, the voltage difference between the two ends of the breaker auxiliary switch detected by the voltage detection device 13 is at a high level, refer to Figure 4 ;

[0068] Control the closing relay 11 of phase A to close, the closing circuit of phase A is connected, the closing coil HQA of phase A is energized, phase A closes, and the power system is connected to the power circuit of phase A, realizing the single-phase operation condition of independent operation of phase A. The breaker auxiliary switch DLA2 in the closing circuit of phase A is disconnected, and the breaker auxiliary switch DLA1 in the opening circuit of phase A is closed. Refer to Figure 3 , at this time, the voltage difference across the breaker auxiliary switch in the opening circuit detected by the voltage detection device 13 becomes a low level. Refer to Figure 4 ;

[0069] When the single-phase system operates for a certain period of time, the single-phase protection operates, and phase A trips. At this time, the breaker auxiliary switch DLA2 in the closing circuit of phase A is closed, and the breaker auxiliary switch DLA1 in the opening circuit of phase A is disconnected. Refer to Figure 2 , the voltage difference across the breaker auxiliary switch in the opening circuit detected by the voltage detection device 13 returns to a high level. Refer to Figure 4 , and the fault is removed.

[0070] It can be seen from this that, refer to Figure 4 , in the embodiment of the present invention, the action time from the occurrence of the single-phase operation condition to the protection action to remove the single-phase fault of the power grid can be determined according to the two jumps of the voltage difference, and the single-phase protection verification is carried out.

[0071] It should be noted that the first preset voltage and the second preset voltage can be set according to actual application requirements, and are not specifically limited.

[0072] The main control device 14 can sequentially execute the above steps for each phase, and automatically realize the automatic verification of the single-phase protection for each phase.

[0073] In a possible implementation manner, refer to Figure 1 , the voltage detection device 13 is also used to sample the voltage difference across the breaker auxiliary switch (for example, DLA2) in the closing circuit of each phase;

[0074] The main control device 14 is also used for:

[0075] 1. Determine the second verification result of the single-phase protection verification for each phase according to the voltage difference across the breaker auxiliary switch in the closing circuit of each phase; wherein, the second verification result is qualified or unqualified;

[0076] 2. Verify the first verification result according to the second verification result.

[0077] Refer to Figure 2 and Figure 3, the voltage difference across the two ends of the breaker auxiliary switch in the closing circuit can also reflect the operating time of the out-of-phase protection. Therefore, the voltage difference across the two ends of the breaker auxiliary switch in each closing circuit can also be sampled. When it is detected that the voltage difference switches from less than the second preset voltage to greater than the first preset voltage, it is recorded as the third moment. When it is detected that the voltage difference switches from greater than the first preset voltage to less than the second preset voltage, it is recorded as the fourth moment. If the time interval between the fourth moment and the third moment is within the preset duration range, it is determined that the corresponding first verification result is qualified; otherwise, it is unqualified.

[0078] Furthermore, the first verification result can also be verified according to the second verification result.

[0079] Specifically, if the first verification result is the same as the second verification result, it indicates that the first verification result is accurate. If the first verification result is different from the second verification result, it indicates that at least one of the verification results is inaccurate, and the first verification result is not output.

[0080] In a possible implementation, referring to Figure 5 , the out-of-phase protection automatic verification device may further include: six relay driving modules; the six relay driving modules are respectively in one-to-one correspondence with the three-phase closing relay 11 and the three-phase tripping relay 12, and are respectively used to drive the three-phase closing relay 11 and the three-phase tripping relay 12;

[0081] The relay driving module may include: a first optocoupler U1, a first diode D1, and a first resistor R1;

[0082] The anode of the first optocoupler U1 is connected to the first end of the first resistor R1, the cathode of the first optocoupler U1 is connected to the first grounding end DGND, the collector of the first optocoupler U1 is respectively connected to the first end of the coil of the corresponding relay and the anode of the first diode D1, and the emitter of the first optocoupler U1 is connected to the second grounding end AGND;

[0083] The second end of the coil of the relay corresponding to the collector of the first optocoupler U1 and the cathode of the first diode D1 are both connected to the DC power supply;

[0084] The second end of the first resistor R1 is connected to the main control device 14.

[0085] In the embodiment of the present invention, independent control of each relay is realized through six relay driving modules, so as to realize the out-of-phase operation condition of the system.

[0086] At the same time, the relay driving module is provided with a first optocoupler U1 for signal isolation, which improves the anti-interference ability of the device.

[0087] In a possible implementation, referring to Figure 6, the non-full-phase protection automatic calibration device may further include: six display modules; the six display modules are respectively in one-to-one correspondence with the six relay driving modules;

[0088] The display module may include: a light-emitting diode D2 and a second resistor R2;

[0089] The anode of the light-emitting diode D2 is connected to the second end of the first resistor R1 in the corresponding relay driving module through the second resistor R2, and the cathode of the light-emitting diode D2 is connected to the first ground terminal DGND.

[0090] In the embodiment of the present invention, a display module is further provided for indicating the operation states of the three-phase closing relay 11 and the three-phase tripping relay 12. When any one of the three-phase closing relay 11 and the three-phase tripping relay 12 is closed, the light-emitting diode D2 in the corresponding display module emits light for indication.

[0091] Among them, the voltage detection device 13 is used to detect the voltage difference between the two ends of the circuit breaker auxiliary switch in the tripping circuit and the voltage difference between the two ends of the circuit breaker auxiliary switch in the closing circuit. Refer to Figure 2 and Figure 3 , for example, for phase A, the voltage detection device 13 can be connected to the sampling points M and N, ignoring the voltage of the coil, without affecting the calibration.

[0092] Based on the above, in a possible implementation manner, the voltage detection device 13 may include: six voltage detection units; each voltage detection unit is respectively in one-to-one correspondence with each circuit breaker auxiliary switch;

[0093] For any one voltage detection unit, the first end of the voltage detection unit is connected to the first end of the corresponding circuit breaker auxiliary switch, and the second end of the voltage detection unit is connected to the negative power terminal -KM. For the specific circuit schematic diagram, refer to Figure 7 , when the circuit breaker auxiliary switch is open, the voltage detection unit outputs a high level; when the circuit breaker auxiliary switch is closed, the voltage detection unit outputs a low level; the specific principle will not be elaborated here.

[0094] In a possible implementation manner, the non-full-phase protection automatic calibration device may further include: a human-machine interaction module;

[0095] The human-machine interaction module is connected to the main control device 14.

[0096] In the embodiment of the present invention, a human-machine interaction module may also be provided for the staff to interact with the main control device 14 to obtain the current operating state of the system and record the calibration results, etc.

[0097] Specifically, the human-machine interaction module may include: a keyboard, a touch display screen, a voice input device, etc.

[0098] Furthermore, the unbalanced phase protection automatic calibration device may further include: a printing device; the printing settings are connected to the main control device 14 and are used to directly print information such as calibration results.

[0099] In a possible implementation manner, the main control device 14 includes: a main control chip; the main control chip is an STM32F103 type chip.

[0100] In the embodiment of the present invention, the main control chip mainly uses underlying configurations such as general-purpose input / output ports (GPIO), analog-to-digital processors (ADC), timers (Timer), and integrated circuit bus communication protocols (IIC) to cooperate with each other to achieve unbalanced phase protection automatic calibration.

[0101] For another example, the main control chip may also be a microprocessor or FPGA such as the STM series, DSP series, GD32, etc. There is no specific limitation.

[0102] Based on Figures 1 to 8 As can be seen, this device is composed of various electronic components, and the device has a small volume and light weight, which is convenient for the implementation of on-site work.

[0103] In a possible implementation manner, the main control device 14 may also be used for:

[0104] 1. Obtain the emergency stop signal in real time;

[0105] 2. If the emergency stop signal is obtained, do not execute or jump out of the step of controlling the three-phase closing relay 11 to act, and determine the first calibration result of the unbalanced phase protection calibration for each phase according to the pressure difference between the two ends of the circuit breaker auxiliary switch in each phase shunt circuit.

[0106] In the embodiment of the present invention, an emergency stop button is also provided. When the emergency stop button is pressed, the main control device 14 receives the emergency stop signal and terminates the calibration at any time.

[0107] Specifically, the above device further includes: an emergency stop input module; the emergency stop input module is connected to the main control module. For the specific principle, refer to Figure 8 , the wiring terminal U37 is connected to the emergency stop button. When the emergency stop button is pressed, the optocoupler conducts and sends a low-level signal to the main control device 14. Details are not described herein again.

[0108] Furthermore, the main control device 14 is also used for fault handling, etc. Figure 9 FIG. shows the complete control logic of the main control device 14. The control logic of the above main control device 14 will be described in detail below in conjunction with specific embodiments.

[0109] 1. Initialize the system and determine whether the positions of the auxiliary switches of each phase circuit breaker match the tripped state. If they do not match, enter the fault process Fault; if they match, enter the verification process Run;

[0110] 2. Update the relay output state and confirm whether the positions of the auxiliary switches of each phase disconnector are correct; if they are correct, perform non-full-phase protection verification on each phase in turn until all verifications are completed. If the position is incorrect or the verification fails, record the fault and enter the fault process Fault.

[0111] 3. Execute the emergency stop process Idle, obtain the emergency stop signal in real time. If the emergency stop signal is received, enter the stop process Stop, output the three-phase tripped state, and determine whether the three phases are tripped, then enter the fault process Fault or the stop process Stop;

[0112] 4. If the emergency stop button is pressed and the tripping is correct, the program will repeatedly jump between the stop process Stop and the fault process Fault until the emergency stop signal disappears. Based on this, in the embodiment of the present invention, the wiring of the verification device can be carried out after pressing the button, and after the wiring is completed, lift the emergency stop button to enter the normal verification process Run.

[0113] Others are not elaborated here.

[0114] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A non-full-phase protection automatic verification device, characterized in that: include: Three-phase closing relay, three-phase tripping relay, voltage detection device and main control device; For any one of the three phases, the first end of the phase closing relay is connected to the positive power terminal, and the second end of the phase closing relay is connected to an end of the circuit breaker auxiliary switch in the phase closing circuit away from the negative power terminal; the first end of the phase tripping relay is connected to the positive power terminal, and the second end of the phase tripping relay is connected to an end of the circuit breaker auxiliary switch in the phase opening circuit away from the negative power terminal; The voltage detection device is used to sample the voltage difference across the circuit breaker auxiliary switch in each phase opening circuit; the main control device is used to: control the action of the three-phase closing relay, and determine the first verification result of the non-full-phase protection verification of each phase according to the voltage difference across the circuit breaker auxiliary switch in each phase opening circuit; wherein the first verification result is qualified or unqualified.

2. The non-full-phase protection automatic verification device according to claim 1, characterized in that: The controlling the three-phase closing relay to operate and determining the first verification result of the non-full-phase protection verification of each phase according to the voltage difference between the two ends of the circuit breaker auxiliary switch in the opening circuit of each phase, includes: Continuously obtain the voltage difference between the two ends of the circuit breaker auxiliary switch in each phase opening circuit; For any one of the three phases, control the closing relay of the phase to close; when it is detected that the pressure difference at both ends of the circuit breaker auxiliary switch in the phase opening circuit meets the first preset condition, it is recorded as the first moment; when it is detected that the pressure difference at both ends of the circuit breaker auxiliary switch in the phase opening circuit meets the second preset condition, it is recorded as the second moment; if the time interval between the second moment and the first moment is within the preset time range, the corresponding first verification result is determined to be qualified; otherwise, it is unqualified.

3. The non-full-phase protection automatic verification device according to claim 2, characterized in that: The first preset condition is that the voltage difference across the circuit breaker auxiliary switch in the phase-opening circuit is switched from being greater than the first preset voltage to being less than the second preset voltage; The second preset condition is that the voltage difference across the circuit breaker auxiliary switch in the phase-opening circuit is switched from being less than the second preset voltage to being greater than the first preset voltage; Wherein, the first preset voltage is greater than the second preset voltage.

4. The non-full-phase protection automatic verification device according to claim 3, characterized in that: The first preset voltage is 100V, and the second preset voltage is 10V.

5. The non-full-phase protection automatic verification device according to claim 1, characterized in that: The voltage detection device is also used to sample the voltage difference between the two ends of the circuit breaker auxiliary switch in each phase closing circuit; the main control device is also used to: Determine the second verification result of the non-full-phase protection verification of each phase according to the voltage difference between the two ends of the circuit breaker auxiliary switch in the closing circuit of each phase; wherein the second verification result is qualified or unqualified; The first verification result is verified according to the second verification result.

6. The non-full-phase protection automatic verification device according to claim 5, characterized in that: The non-full-phase protection automatic verification device further includes: six relay driving modules; the six relay driving modules correspond to the three-phase closing relay and the three-phase tripping relay one by one, respectively, and are used to drive the three-phase closing relay and the three-phase tripping relay respectively; The relay driving module includes: a first optical coupler, a first diode and a first resistor; The anode of the first optical coupler is connected to the first end of the first resistor, the cathode of the first optical coupler is connected to the first ground terminal, the collector of the first optical coupler is respectively connected to the first end of the coil of the corresponding relay and the anode of the first diode, and the emitter of the first optical coupler is connected to the second ground terminal; The second end of the coil of the relay corresponding to the collector of the first optical coupler and the cathode of the first diode are both connected to a DC power supply; The second end of the first resistor is connected to the main control device.

7. The non-full-phase protection automatic verification device according to claim 6, characterized in that: The non-full-phase protection automatic verification device also includes: six display modules; the six display modules correspond to the six relay drive modules one by one; The display module includes: a light emitting diode and a second resistor; The anode of the light emitting diode is connected to the second end of the first resistor in the corresponding relay driving module through the second resistor, and the cathode of the light emitting diode is connected to the first grounding end.

8. The non-full-phase protection automatic verification device according to claim 1, characterized in that: The non-full-phase protection automatic verification device also includes: a human-computer interaction module; The human-computer interaction module is connected to the main control device.

9. The non-full-phase protection automatic verification device according to claim 1, characterized in that: The main control device comprises: a main control chip; the main control chip is a STM32F103 chip.

10. The non-full-phase protection automatic verification device according to any one of claims 1 to 9, characterized in that: The main control device is also used for: Get emergency stop signal in real time; If the emergency stop signal is obtained, the step of controlling the three-phase closing relay action is not executed or exited, and the step of determining the first verification result of the non-full-phase protection verification of each phase is performed according to the voltage difference at both ends of the circuit breaker auxiliary switch in each phase opening circuit.

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