Multifunctional integrated nuclear phase device

Abstract

The utility model provides a multifunctional integrated nuclear phase device, comprising a host and a slave which have the same structure and are connected through wireless communication; the host machine or the slave machine specifically comprises a multi-path signal measuring module, a central processing module, a wireless communication module, a switch control module, a display module, a storage module and a power supply module; the wireless communication module is connected to the central processing module through a serial port; the switch control module is connected with the central processing module through an I / O interface. The display module is connected with the central processing module through a serial peripheral interface (SPI). The device can simultaneously solve the problems of difficulty in two-point phase checking in different places and difficulty in N600 multi-point grounding detection; through one-time wiring and automatic identification, all parameters can be measured, manpower commissioning is reduced, and the working efficiency is improved; all measurements are carried out in an electrified state; the device is small in size and portable, the host and the slave can visually display test results, and electric power personnel can conveniently carry out on-site inspection.

Description

Technical Field

[0001] The utility model belongs to the technical field of secondary equipment of power system, and more specifically relates to a multifunctional integrated nuclear phase device. Background Art

[0002] The secondary phase check of the voltage transformer is a necessary inspection item after the equipment of the new, modified and expanded substation project is energized. The correct secondary phase check is the basis for ensuring the correct operation of the relay protection and the accuracy of measurement and metering. According to the "Key Points of Anti-Accident Measures for Relay Protection and Safety Automatic Devices in Power Systems", several sets of secondary circuits of voltage transformers connected through the zero-phase busbar (N600) in the control room should only be grounded at one point N600 in the control room. If there are two or more points of grounding at the secondary neutral point of the transformer, the voltage phase of the neutral point will be offset, which may cause the distance protection and zero-sequence direction protection to refuse to operate or malfunction; in order to ensure reliable grounding and the safety of personnel and equipment, the inspection, operation and maintenance management of the secondary neutral point N600 of the substation voltage transformer has become an important part of the regular inspection and testing of the power system operation and maintenance personnel.

[0003] At present, secondary phase checking equipment is mainly composed of multimeters and phase sequence meters, and there are also single-phase wireless phase checking instruments. The use of this instrument can significantly reduce the manpower and time costs of secondary phase checking, but the wiring still needs to be changed frequently during the phase checking; at the same time, there is no convenient N600 multi-point grounding measurement and search device. The existing device has the following shortcomings: the resistance method test process is inefficient, the test results need to be manually analyzed, and the accuracy of the grounding point search cannot be ensured; for the bus voltages at both ends of different locations, the wiring needs to be changed frequently, the work efficiency is low, and the power outage time is extended; the method of injecting a low-frequency DC current signal into the loop may cause abnormal protection devices, bring greater safety hazards, and interfere with the running protection equipment, affecting its normal operation.

[0004] The prior art has the following deficiencies:

[0005] (1) When conducting on-site inspections of equipment for new, modified, or expanded substation projects, many types of equipment are required, which results in long on-site inspection time, low efficiency, large number of personnel, and low accuracy. There is no multifunctional integrated phase-checking device.

[0006] (2) There is no instrument that can simultaneously perform secondary phase checking on the PT secondary circuit and multi-point grounding inspection on the secondary side of the voltage transformer, which cannot solve the problem of difficulty in two-point phase checking in a different location and difficulty in multi-point grounding inspection of N600;

[0007] (3) The existing PT secondary circuit phase checking instruments have high manpower and time costs, and the wiring needs to be changed frequently during the phase checking;

[0008] (4) When checking the phase of the bus voltage at both ends of different locations, the wiring needs to be changed frequently, which reduces the work efficiency and prolongs the power outage time;

[0009] (5) The test results of the existing instrument for multi-point grounding inspection on the secondary side of the voltage transformer need to be manually analyzed, and the inspection by maintenance personnel takes a lot of time. The workload of checking each substation is large, the operation is arbitrary, the inspection efficiency is low, the accuracy of grounding point search is not high, and some measurement methods may cause abnormal protection devices. Utility Model Content

[0010] In order to solve the deficiencies in the prior art, the utility model provides a multifunctional integrated nuclear phase device.

[0011] The utility model adopts the following technical solutions.

[0012] The utility model provides a multifunctional integrated nuclear phase device, comprising:

[0013] The host and the slave have the same structure, and the host and the slave are connected through wireless communication; the host or the slave specifically comprises: a multi-channel signal measurement module, a central processing module, a wireless communication module, a switch control module, a display module, a storage module and a power module; the wireless communication module is connected to the central processing module through a serial port; the switch control module is connected to the central processing module through an I / O interface; the display module is connected to the central processing module through a serial peripheral interface SPI.

[0014] Preferably, the multi-channel signal measurement module includes a three-phase voltage measurement circuit and a ground current measurement circuit.

[0015] Further preferably, the three-phase voltage measurement circuit comprises:

[0016] A first resistor, serving as a current limiting resistor;

[0017] A mutual inductor, wherein one end of the primary coil is connected to the A-phase voltage input terminal through a first resistor, and the other end is directly connected to the neutral point input terminal, and one end of the secondary coil is connected to the inverting input terminal of the first operational amplifier, and the other end is grounded;

[0018] The non-inverting input terminal of the first operational amplifier is grounded and connected to the inverting input terminal of the first operational amplifier through the second resistor; the output terminal of the first operational amplifier is connected to the inverting input terminal of the first operational amplifier through the third resistor;

[0019] The inverting input terminal of the second operational amplifier is directly connected to the output terminal of the first operational amplifier, and the fourth resistor, the fifth resistor, or the sixth resistor is connected to the output terminal of the second operational amplifier through the first switch switching different resistors; the output terminal of the second operational amplifier is connected to the first filter capacitor and then to ground via the seventh resistor;

[0020] The first output terminal is connected to the analog-to-digital conversion unit of the central processing module.

[0021] Further preferably, the ground current measurement circuit comprises:

[0022] An eighth resistor, one end of which is connected to the current input terminal and the other end of which is grounded;

[0023] The non-inverting input terminal of the third operational amplifier is grounded, the inverting input terminal is connected to the current input terminal, and the ninth resistor, the tenth resistor, or the eleventh resistor is connected to the output terminal of the third operational amplifier by controlling the second switch to switch different resistors; the output terminal of the third operational amplifier is connected to the second filter capacitor and then to the ground via the twelfth resistor;

[0024] The second output terminal is connected to the analog-to-digital conversion unit of the central processing module.

[0025] Preferably, the switch control module includes: a page-up switch, a page-left switch, a page-right switch, a page-down switch, a display hold switch, a storage switch and a power switch.

[0026] Preferably, the display module is connected to a display screen, and the displayed contents include: voltage, current amplitude, phase, voltage secondary circuit phase verification, voltage phase sequence determination results and N600 multi-point grounding test results.

[0027] Preferably, the storage module comprises: a memory card interface and a TF storage circuit.

[0028] Preferably, the power supply module comprises: a DC conversion circuit, a reference voltage circuit, a charging circuit, and a power supply detection circuit.

[0029] Further preferably, the output of the reference voltage circuit is connected to a central processing module as a reference voltage for measurement; and the power supply detection circuit divides the battery voltage and then connects it to the central processing module.

[0030] Preferably, the external interface of the device includes: a three-phase voltage input interface, a ground current input interface, a display screen, a power switch, a display hold switch, a storage switch, a page-up switch, a page-left switch, a page-right switch, a page-down switch, a charging interface, and a storage card interface.

[0031] Compared with the prior art, the beneficial effects of the present invention include at least:

[0032] This device integrates phase meter, phase sequence meter, power meter, PT secondary voltage phase checker and N600 multi-point grounding tester, which can solve the problems of difficult two-point phase check in different places and difficult N600 multi-point grounding detection at the same time.

[0033] One-time wiring and automatic identification can measure all parameters, reducing manpower for operation. 1-2 people can complete the on-site inspection of new, modified and expanded substation equipment after power on, thus improving work efficiency.

[0034] All measurements are carried out under power-on conditions, which does not affect the economic benefits of electricity users;

[0035] Wireless communication is used to solve the voltage phase verification problem of the busbars at both ends in different locations, and it is also convenient for N600 to find multiple grounding points;

[0036] One set of equipment can complete the measurement of multiple parameters. The device is small and portable. Both the host and slave devices can intuitively display the test results, making it convenient for power personnel to conduct on-site inspections. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of a multifunctional integrated nuclear phase device provided according to an embodiment of the utility model;

[0038] Figure 2 It is a master-slave structure diagram provided according to an embodiment of the utility model;

[0039] Figure 3 It is a circuit diagram of phase A voltage measurement in a three-phase voltage measurement circuit provided in accordance with an embodiment of the utility model;

[0040] Figure 4 A ground current measurement circuit diagram is provided according to an embodiment of the utility model;

[0041] Figure 5 It is a schematic diagram of the external interfaces of various modules of the device provided in accordance with an embodiment of the present utility model.

[0042] In the figure, R1 is the first resistor; R2 is the second resistor; R3 is the third resistor; R4 is the fourth resistor; R5 is the fifth resistor; R6 is the sixth resistor; R7 is the seventh resistor; R8 is the eighth resistor; R9 is the ninth resistor; R10 is the tenth resistor; R11 is the eleventh resistor; R12 is the twelfth resistor; U1 is the first operational amplifier; U2 is the second operational amplifier; U3 is the third operational amplifier; K1 is the first switch; K2 is the second switch; C1 is the first filter capacitor; C2 is the second filter Wave capacitor; A, A phase voltage input terminal; B, B phase voltage input terminal; C, C phase voltage input terminal; N, neutral point input terminal; I, current input terminal; ADC_CH1, first output terminal; ADC_CH2, second output terminal; 1. Display screen; 21. Power switch; 22. Display hold switch; 23. Storage switch; 24. Page up switch; 25. Page left switch; 26. Page right switch; 27. Page down switch; 3. Charging interface; 4. Storage card interface. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The embodiments described in this application are only part of the embodiments of the utility model, not all of them. Based on the spirit of the utility model, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the utility model.

[0044] like Figure 1 As shown, embodiment 1 of the utility model provides a multifunctional integrated phase checking device, including a host in a voltage transformer ① and a slave in a voltage transformer ②. The host and the slave are connected via wireless communication, and both can display their own measurement data and the phase checking results of the master and slave.

[0045] like Figure 2 As shown, the host or slave has the same structure, specifically including: a multi-channel signal measurement module, a central processing module, a wireless communication module, a switch control module, a display module, a storage module and a power module.

[0046] The multi-channel signal measurement module includes a three-phase voltage measurement circuit and a ground current measurement circuit;

[0047] Each phase of the three-phase voltage measurement circuit includes: a current limiting resistor, an isolation transformer, an operational amplifier, a filter capacitor, and a switch; the output end is connected to an ADC processing unit of a central processing module;

[0048] Preferably, but not restrictively, the A-phase voltage measurement circuit in the three-phase voltage measurement circuit is as follows: Figure 3 As shown, including:

[0049] The first resistor R1 is used as a current limiting resistor to limit the input system voltage;

[0050] The transformer T1 is used to electrically isolate the input and output sides. One end of the primary coil of the transformer T1 is connected to the A-phase voltage input terminal A through the first resistor R1, and the other end is directly connected to the neutral point input terminal N. One end of the secondary coil is connected to the inverting input terminal of the first operational amplifier U1, and the other end is grounded.

[0051] The non-inverting input terminal of the first operational amplifier U1 is grounded and connected to the inverting input terminal of the first operational amplifier U1 through the second resistor R2; the output terminal of the first operational amplifier U1 is connected to the inverting input terminal of the first operational amplifier U1 through the third resistor R3;

[0052] The inverting input terminal of the second operational amplifier U2 is directly connected to the output terminal of the first operational amplifier U1, and the fourth resistor R4, the fifth resistor R5, or the sixth resistor R6 is switched to the output terminal of the second operational amplifier U2 through the first switch K1 to achieve amplification of different ranges; the output terminal of the second operational amplifier U2 is connected to the first filter capacitor C1 and then to ground via the seventh resistor R7;

[0053] The first output terminal ADC_CH1 is connected to the ADC.

[0054] The ground current measurement module includes a resistor, a filter capacitor, an operational amplifier, and a switch; the output end is connected to the ADC processing unit of the central processing module;

[0055] Preferably, but not limited to, a ground current measurement circuit such as Figure 4 As shown, including:

[0056] An eighth resistor R8, one end of which is connected to the current input terminal I, and the other end of which is grounded;

[0057] The non-inverting input terminal of the third operational amplifier U3 is grounded, the inverting input terminal is connected to the current input terminal I, and the ninth resistor R9, the tenth resistor R10, or the eleventh resistor R11 is connected to the output terminal of the third operational amplifier U3 by controlling the second switch K2 to switch different resistors, so as to achieve amplification of different ranges; the output terminal of the third operational amplifier U3 is connected to the second filter capacitor C2 and then to the ground via the twelfth resistor R12;

[0058] The second output terminal ADC_CH2 is connected to the ADC.

[0059] The central processing module has a built-in ADC processing unit, and the multi-channel signal measurement module is connected to the central processing module through an analog-to-digital conversion interface to perform digital conversion on the analog voltages of the input multi-channel signals.

[0060] The wireless communication module is connected to the central processing module via a serial port.

[0061] The switch control module includes: a page turning switch, a display holding switch, a storage switch and a power switch, and is connected to the central processing module through an I / O interface.

[0062] The display module is connected to the central processing module via a serial peripheral interface SPI and is connected to a true color display screen 1. The display content includes: voltage, current amplitude, phase, voltage secondary circuit phase core, voltage phase sequence discrimination result and N600 multi-point grounding test result.

[0063] The storage module includes: a memory card interface and a TF storage circuit, which facilitates the export and archiving of storage results.

[0064] The power module comprises:

[0065] The DC conversion circuit converts the battery voltage into the device operating voltage through the DC-DC power conversion circuit and the voltage stabilization circuit.

[0066] A reference voltage circuit converts the working voltage into a reference voltage, and the output is connected to the central processing module as a reference voltage for measurement;

[0067] The charging circuit is connected to the charging voltage through the Type-C interface, connected to the battery voltage, and charges the battery;

[0068] The power supply detection circuit connects the battery voltage to the central processing module after voltage division. The central processing module detects the battery voltage, displays the power level of the control device, and shuts down when the power is insufficient.

[0069] like Figure 5 As shown, the external interfaces corresponding to each module of a multifunctional integrated nuclear phase device provided by the utility model include: three-phase voltage input interfaces A, B, C, N, one ground current input interface I, display screen 1, power switch 21, display hold switch 22, storage switch 23, page up switch 24, page left switch 25, page right switch 26, page down switch 27, charging interface 3, storage card interface 4.

[0070] Compared with the prior art, the beneficial effects of the present invention include at least:

[0071] This device integrates phase meter, phase sequence meter, power meter, PT secondary voltage phase checker and N600 multi-point grounding tester, which can solve the problems of difficult two-point phase check in different places and difficult N600 multi-point grounding detection at the same time.

[0072] One-time wiring and automatic identification can measure all parameters, reducing manpower for operation. 1-2 people can complete the on-site inspection of new, modified and expanded substation equipment after power on, thus improving work efficiency.

[0073] All measurements are carried out under power-on conditions, which does not affect the economic benefits of electricity users;

[0074] Wireless communication is used to solve the voltage phase verification problem of the busbars at both ends in different locations, and it is also convenient for N600 to find multiple grounding points;

[0075] One set of equipment can complete the measurement of multiple parameters. The device is small and portable. Both the host and slave devices can intuitively display the test results, making it convenient for power personnel to conduct on-site inspections.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the utility model should be included in the scope of protection of the claims of the utility model.

Claims

1. A multifunctional integrated nuclear phase device, characterized in that: include: The host and slave have the same structure, and the host and the slave are connected via wireless communication; The host or slave specifically includes: a multi-channel signal measurement module, a central processing module, a wireless communication module, a switch control module, a display module, a storage module and a power module; The wireless communication module is connected to the central processing module through a serial port; the switch control module is connected to the central processing module through an I / O interface; and the display module is connected to the central processing module through a serial peripheral interface SPI.

2. The multifunctional integrated nuclear phase device according to claim 1, characterized in that: The multi-channel signal measurement module includes a three-phase voltage measurement circuit and a ground current measurement circuit.

3. The multifunctional integrated nuclear phase device according to claim 2, characterized in that: The three-phase voltage measurement circuit comprises: A first resistor (R1) serving as a current limiting resistor; A mutual inductor (T1), wherein one end of the primary coil is connected to the A-phase voltage input terminal (A) through a first resistor (R1), and the other end is directly connected to the neutral point input terminal (N); one end of the secondary coil is connected to the inverting input terminal of a first operational amplifier (U1), and the other end is grounded; The non-inverting input terminal of the first operational amplifier (U1) is grounded and connected to the inverting input terminal of the first operational amplifier (U1) through a second resistor (R2); the output terminal of the first operational amplifier (U1) is connected to the inverting input terminal of the first operational amplifier (U1) through a third resistor (R3); The inverting input end of the second operational amplifier (U2) is directly connected to the output end of the first operational amplifier (U1), and is connected to the output end of the second operational amplifier (U2) by switching different resistors, a fourth resistor (R4), a fifth resistor (R5), or a sixth resistor (R6) through a first switch (K1); the output end of the second operational amplifier (U2) is connected to the first filter capacitor (C1) and then grounded through a seventh resistor (R7); The first output terminal (ADC_CH1) is connected to the analog-to-digital conversion unit of the central processing module.

4. The multifunctional integrated nuclear phase device according to claim 2, characterized in that: The ground current measurement circuit comprises: an eighth resistor (R8), one end of which is connected to the current input terminal (I) and the other end of which is grounded; The third operational amplifier (U3) has a non-inverting input terminal connected to the ground, an inverting input terminal connected to the current input terminal (I), and a ninth resistor (R9), a tenth resistor (R10), or an eleventh resistor (R11) connected to the output terminal of the third operational amplifier (U3) by controlling the second switch (K2); the output terminal of the third operational amplifier (U3) is connected to the second filter capacitor (C2) and then to the ground via the twelfth resistor (R12); The second output terminal (ADC_CH2) is connected to the analog-to-digital conversion unit of the central processing module.

5. The multifunctional integrated nuclear phase device according to claim 1, characterized in that: The switch control module comprises: an upward page switching switch (24), a left page switching switch (25), a right page switching switch (26), a downward page switching switch (27), a display holding switch (22), a storage switch (23) and a power switch (21).

6. The multifunctional integrated nuclear phase device according to claim 1, characterized in that: The display module is connected to a display screen (1), and the displayed contents include: voltage, current amplitude, phase, voltage secondary circuit phase verification, voltage phase sequence determination result and N600 multi-point grounding test result.

7. The multifunctional integrated nuclear phase device according to claim 1, characterized in that: The storage module comprises: a storage card interface (4) and a TF storage circuit.

8. The multifunctional integrated nuclear phase device according to claim 1, characterized in that: The power supply module includes: a DC conversion circuit, a reference voltage circuit, a charging circuit, and a power supply detection circuit.

9. The multifunctional integrated nuclear phase device according to claim 8, characterized in that: The output of the reference voltage circuit is connected to the central processing module as a reference voltage for measurement; The power supply detection circuit divides the battery voltage and then connects it to the central processing module.

10. The multifunctional integrated nuclear phase device according to claim 1, characterized in that: The external interfaces of the device include: three-phase voltage input interfaces (A), (B), (C), and (N), a ground current input interface (I), a display screen (1), a power switch (21), a display hold switch (22), a storage switch (23), an up-page switching switch (24), a left-page switching switch (25), a right-page switching switch (26), a down-page switching switch (27), a charging interface (3), and a storage card interface (4).

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