Portable arrester monitoring device calibrator

Abstract

The utility model discloses a portable calibrator for a lightning arrester monitoring device, which is characterized in that a high-capacity lithium battery power supply drives a direct-current high-voltage generating circuit to output a high-voltage direct-current power supply, and the output high-voltage direct-current power supply is sent to a high-voltage capacitor charging and discharging circuit to provide a charging power supply for the high-voltage capacitor charging and discharging circuit. A GPIO port of the ARM control chip is connected with the high-voltage capacitor charging and discharging circuit, and charging or discharging of the high-voltage capacitor charging and discharging circuit is achieved by controlling connection and disconnection of the relay. The ARM control chip is connected with the MOS tube driving control circuit and the impact current / leakage current output circuit through a GPIO port, an output terminal in the impact current / leakage current output circuit is connected with a monitored lightning arrester monitoring device, and verification is achieved by controlling closing or opening of the impact current / leakage current output circuit. Meanwhile, an operator can check relevant parameters of the lightning arrester monitoring device to be detected through the serial port screen and correspondingly inquire the performance of the lightning arrester monitoring device to be detected, so that human-computer interaction of detection personnel is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of lightning arrester detection devices, in particular to a portable lightning arrester monitoring device calibrator. Background Art

[0002] Monitoring devices for lightning arresters have been popularized in various power plants and power stations of all sizes in my country, providing important data for the reliable operation of lightning arresters. When the operating lightning arrester monitor displays abnormal data, the staff needs to conduct corresponding tests to find out the cause of the fault. Among them, when the monitor value is significantly larger than normal, it is generally due to an increase in the continuous current of the lightning arrester, or a fault in the measuring part of the monitor. When the monitor value decreases significantly, it is generally caused by leakage of the insulation base of the lightning arrester or breakdown of the internal components of the monitor. In the current power system, the lightning arrester monitoring device, as a lightning arrester monitoring component for transmission and transformation lines to resist overvoltage or lightning strikes, has been widely used in high-voltage lines and substations.

[0003] If the arrester monitoring device is not used for a long time, the internal battery needs to be fully charged and placed, and the charging and discharging process maintenance work should be carried out every once in a while. In order to ensure the use of the arrester monitoring device, the arrester monitoring device must be calibrated regularly every year. Since there is no low-voltage AC power supply near the high-voltage line, and the arrester monitoring device is used online in real time, it cannot be removed for calibration, resulting in its lack of flexibility during calibration and use. Therefore, there is an urgent need for a portable arrester monitoring device calibrator. Utility Model Content

[0004] The content of this utility model is used to introduce the concepts in a brief form, which will be described in detail in the following specific implementation. The content of this utility model is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0005] In view of the problems and shortcomings in the prior art, the utility model provides a portable arrester monitoring device calibrator, which drives a DC high-voltage generating circuit to output a high-voltage DC power supply through a large-capacity lithium battery power supply, and the output high-voltage DC power supply is sent to a high-voltage capacitor charging and discharging circuit to realize charging and discharging. The ARM control chip connects the MOS tube driving control circuit and the impulse current / leakage current output circuit through the GPIO port, and uses the output terminal of the impulse current / leakage current output circuit to connect the arrester monitoring device calibrator to be tested. It is used to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: including a lithium battery power supply, a DC high voltage generating circuit, a high voltage capacitor charging and discharging circuit, a MOS tube driving control circuit, an impact current / leakage current output circuit and an ARM control chip, wherein the lithium battery power supply is electrically connected to the DC high voltage generating circuit for driving, the DC high voltage generating circuit is electrically connected to the high voltage capacitor charging and discharging circuit for charging and discharging, the ARM control chip is electrically connected to the DC high voltage generating circuit, the high voltage capacitor charging and discharging circuit, the MOS tube driving control circuit and the impact current / leakage current output circuit for realizing control, and the high voltage capacitor charging and discharging circuit and the MOS tube driving control circuit are respectively electrically connected to the impact current / leakage current output circuit for calibrating the lightning arrester monitoring device under test.

[0007] Preferably, the digital-to-analog conversion terminal of the ARM control chip is electrically connected to the voltage feedback terminal of the DC high-voltage generating circuit after being connected in series with a resistor. The ARM control chip outputs an adjustable feedback voltage to the voltage feedback terminal of the DC high-voltage generating circuit to change the voltage feedback signal of the DC high-voltage generating circuit and also change the frequency of the DC high-voltage generating circuit, thereby controlling the output voltage amplitude of the high-voltage power supply.

[0008] Preferably, the voltage-capacitance charge-discharge circuit comprises a capacitor and a relay, and the control end of the ARM control chip is connected in series with a resistor, a field effect transistor and a relay coil, and the charging or discharging of the capacitor is achieved by controlling the closing or opening of the relay.

[0009] Preferably, the output end of the MOS tube drive control circuit is electrically connected to four field effect tubes, and the four field effect tubes are connected to form a bridge push-pull circuit. The bridge push-pull circuit is used in situations where the power supply voltage is low and a large output power is required, which can greatly improve the power supply utilization rate.

[0010] Preferably, the two output ends of the bridge push-pull circuit are electrically connected to the two input ends of the choke coil, and a capacitor is connected in parallel between the two output ends of the bridge push-pull circuit. The choke coil and the capacitor both have a filtering function, and can filter out the high-frequency pulse components output by the bridge push-pull circuit.

[0011] Preferably, the impulse current / leakage current output circuit includes a relay and an output terminal, the control end of the ARM control chip is connected in series with a resistor, a field effect transistor and a relay coil, the output terminal is connected to a lightning arrester monitoring device under test, and the calibration of the lightning arrester monitoring device under test is achieved by controlling the closing or opening of the relay.

[0012] Preferably, one end of the output terminal is electrically connected to a cement resistor and then connected to a protective ground. The two output terminals are electrically connected to a cement resistor and then connected to a protective ground, and the remaining residual voltage on the two output terminals can flow into the ground through the cement resistor, ensuring that there is no high voltage on the output terminal to cause personal injury to the tester, thereby improving safety during use.

[0013] Preferably, the ARM control chip is connected to an LCD serial port screen for communication. The operator can view the relevant parameters of the lightning arrester monitoring device under test through the LCD serial port screen M4, and query the performance of the lightning arrester monitoring device under test accordingly, so as to facilitate the human-computer interaction of the detection personnel.

[0014] Compared with the prior art, the beneficial effects provided by the utility model are:

[0015] The utility model has excellent portability and can well solve the convenience of lightning arrester monitoring device calibration. A large-capacity lithium battery power source drives a DC high-voltage generating circuit to output a high-voltage DC power source, and the output high-voltage DC power source is sent to a high-voltage capacitor charging and discharging circuit to provide a charging power source for it. The GPIO port of the ARM control chip is connected to the high-voltage capacitor charging and discharging circuit, and the charging or discharging of the high-voltage capacitor charging and discharging circuit is achieved by controlling the conduction and disconnection of the relay. The ARM control chip connects the MOS tube drive control circuit and the impulse current / leakage current output circuit through the GPIO port, and the output terminal in the impulse current / leakage current output circuit is connected to the lightning arrester monitoring device under test, and the calibration is achieved by controlling the closing or disconnection of the impulse current / leakage current output circuit. At the same time, the operator can view the relevant parameters of the lightning arrester monitoring device under test through the LCD serial port screen, and query the performance of the lightning arrester monitoring device under test accordingly, which is convenient for the detection personnel to perform human-computer interaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a block diagram of the connection principle of the portable detuning device parameter measuring instrument of the utility model;

[0017] Figure 2 The utility model is a connection circuit diagram of a portable detuning device parameter measuring instrument. DETAILED DESCRIPTION

[0018] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0019] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other. Example

[0020] This embodiment provides a portable arrester monitoring device calibrator, referring to Figure 1 and Figure 2 As shown, it includes a lithium battery power supply, a DC high voltage generating circuit, a high voltage capacitor charging and discharging circuit, a MOS tube driving control circuit, an impact current / leakage current output circuit and an ARM control chip. The lithium battery module is electrically connected to the DC high voltage generating circuit for driving, and the ARM control chip is electrically connected to the DC high voltage generating circuit through its peripheral DAC digital-to-analog conversion circuit for outputting high voltage DC power. The GPIO end of the ARM control chip is electrically connected to the high voltage capacitor charging and discharging circuit, the MOS tube driving control circuit and the impact current / leakage current output circuit, and the high voltage capacitor charging and discharging circuit and the MOS tube driving control circuit are electrically connected to the impact current / leakage current output circuit.

[0021] The lithium battery power supply BT1 is connected to the DC high voltage generating circuit M1 to drive it to work, and the lithium battery power supply BT1 adopts a 12V2.5Ah large-capacity lithium battery. The lithium battery power supply BT1 is connected to the DC high voltage generating circuit M1 to output the DC high voltage power to the high voltage capacitor charging and discharging circuit, providing the capacitor with a DC high voltage power for charging.

[0022] The high-voltage capacitor charging and discharging circuit includes capacitors C1~C4, relays K1~K4, and resistors R1~R4. Capacitors C1~C4 use CBB polypropylene high-voltage capacitors, relays K1~K4 use two sets of conversion contact relays, and field effect tubes V1~V4 use N-channel MOS tubes. The high-voltage output HVCC end of the DC high-voltage generating circuit M1 is connected to a normally closed contact of the relays K1~K4, the high-voltage grounding HGND end of the DC high-voltage generating circuit M1 is connected to another normally closed contact of the relays K1~K4, and the common control end of the relays K1~K4 is connected in series with capacitors C1~C4. The coils of relays K1~K4 are connected to the sources of the field effect tubes V1~V4, and the gates of the field effect tubes V1~V4 are connected in series with resistors R1~R4 respectively and then connected to the ARM control chip. CBB polypropylene high-voltage capacitors are capacitors used for reactive power compensation in power electronic systems. They use metallized polypropylene film as dielectric material and have the advantages of high electrostatic capacitance, low loss, high reliability, and long life.

[0023] The input end of the MOS tube drive control circuit M3 is connected to the ARM control chip, and the output end of the MOS tube drive control circuit M3 is connected to the field effect tubes V5~V8 through resistors R8, R9, R11, and R12. The field effect tubes V5~V8 form a bridge push-pull circuit. The output end of the bridge push-pull circuit is connected to the input end of the choke coil T1, and the input end of the choke coil T1 is also connected in parallel with the capacitor C6. Resistors R8, R9, R11, and R12 use 0306 chip resistors, field effect tubes V5~V8 use N-channel MOS tubes, and capacitor C6 uses filter capacitors. Chip resistors are one type of metal glass glaze resistors. They are made by screen printing on a substrate. They are resistant to moisture and high temperature and have a small temperature coefficient, which can greatly save circuit space costs. The bridge push-pull circuit is used in situations where the power supply voltage is low and a large output power is required, which can greatly improve the power supply utilization rate.

[0024] The impact current / leakage current output circuit includes relay K5, resistor R5, resistor R6, output terminals J1 and J2, resistor R13, and field effect tube V9. Resistors R5~R6 use high-power cement resistors, K5 uses two sets of conversion contact relays, and field effect tube V9 uses N-channel MOS tube. The output end of the choke coil T1 is connected to the two normally closed contacts of relay K5, the two common control ends of relay K5 are connected to the output terminals J1 and J2 respectively, and the two normally open contacts of relay K1~K4 are connected to the two normally open contacts of relay K5. The coil of relay K5 is connected to the drain of field effect tube V9, and the gate of field effect tube V9 is connected to the ARM control chip in series with resistor R13. The two common control ends of relay K5 are also connected to the protective ground in series with resistors R5 and R6 respectively. The high-power cement resistor is a resistor device encapsulated with ceramic and mineral materials, which has good insulation performance and can withstand higher power loads.

[0025] Method of using the utility model

[0026] When conducting the impulse current test, the large-capacity lithium battery BT1 provides power for the DC high-voltage generating circuit M1. The DC high-voltage generating circuit M1 is driven by an inverter and a MOS tube push-pull drive high-frequency transformer to output a high-frequency AC power supply, which is converted into a high-voltage DC power supply after rectification and filtering, and is electrically connected to the high-voltage capacitor charging and discharging circuit to charge the high-voltage capacitor. The ARM control chip U1 is connected in series with resistors R7 and R10 through the peripheral DAC digital-to-analog conversion circuit, and the other end of resistor R7 is connected in series with capacitor C5 and then grounded. The ARM control chip U1 outputs an adjustable feedback voltage to the voltage feedback terminal VFB of the DC high-voltage generating circuit M1 to change the voltage feedback signal of the DC high-voltage generating circuit, and also changes the frequency of the DC high-voltage generating circuit M1, thereby controlling the output voltage amplitude of the high-voltage power supply.

[0027] When charging, the GPIO ports CK1~CK4 of the ARM control chip U1 output a low level, and are connected to the gates of the field effect MOS tubes V1~V4 through the current limiting resistors R1~R4, respectively. The drains of the field effect MOS tubes V1~V4 are connected to the coils of the relays K1~K4. The field effect MOS tubes V1~V4 are controlled to be cut off, and the CBB polypropylene high-voltage capacitors C1~C4 are connected in parallel with the high-voltage output end of the DC high-voltage generating circuit M1, and the CBB polypropylene high-voltage capacitors C1~C4 are in a charging state. After charging is completed, the GPIO ports CK1~CK4 of the ARM control chip U1 output a high level, and are connected to the gates of the field effect MOS tubes V1~V4 through the current limiting resistors R1~R4, respectively, and the field effect MOS tubes V1~V4 are controlled to be turned on, so that the normally open contacts of the relays K1~K4 are attracted, that is, the CBB polypropylene high-voltage capacitors C1~C4 change from the parallel high-voltage charging state to the series discharge state. After the CBB polypropylene high-voltage capacitors are connected in series, the voltage amplitude becomes 4 times the output voltage of the original DC high-voltage generating circuit.

[0028] The GPIO port CK5 pin of the ARM control chip U1 is connected to the gate of the field effect MOS tube V9 through the current limiting resistor R13, the drain of the field effect MOS tube V9 is connected to the relay K5 coil, the source of the field effect MOS tube V9 is connected to the ground, and the other end of the relay K5 coil is connected to the 12V power supply. When the CK5 pin of the ARM control chip U1 outputs a high level, the field effect MOS tube V9 is turned on and the relay K5 is energized. The normally open contact of the relay K5 is connected to the output terminals J1 and J2, and the high-voltage impulse current can act on the lightning arrester monitoring device under test to conduct an impulse current test. After the test is completed, the ARM control chip U1 controls the release of the relay K5 through the CK5 pin. The output terminals J1 and J2 are connected to the high-power cement resistor R5 and the resistor R6 respectively. The remaining residual pressure on the output terminals J1 and J2 flows into the ground through the high-power cement resistor R5 and the resistor R6, ensuring that there is no high voltage on the output terminals to cause harm to people.

[0029] When conducting a leakage current test, the ARM control chip U1 controls the DC power supply output voltage terminal VL of the DC voltage adjustable circuit M2 through the SPI bus, and the DC power supply output voltage terminal VL provides a DC power supply for the bridge output of the field effect MOS tubes V5~V8. The input terminals HI1, LI1, HI2, and LI2 of the MOS tube drive circuit M3 are respectively connected to the GPIO ports XLL1, XLL2, XLH1, and XLH2 of the ARM control chip U1, and the output terminals HO1, LO1, HO2, and LO2 of the MOS tube drive circuit M3 are respectively connected to the field effect MOS tubes V5~V8 through resistors R8, R9, R11, and R12, and the field effect MOS tubes V5~V8 form a bridge push-pull output circuit. The drain of the field effect MOS tube V5 is connected to the output voltage terminal VL of the DC power adjustable circuit M2, the source of the field effect MOS tube V5 is connected to the drain of the field effect MOS tube V7, and the source of the MOS tube V7 is grounded. The drain of the field effect MOS tube V6 is also connected to the output voltage VL of the DC power supply adjustable circuit M2, the source of the field effect MOS tube V6 is connected to the drain of the field effect MOS tube V8, and the source of the field effect MOS tube V8 is grounded. The source of the field effect MOS tube V5 is connected to an input end of the choke coil T1 as an output end of the bridge push-pull circuit, and the source of the field effect MOS tube V6 is connected to the other input end of the choke coil T1 as the other output end of the bridge push-pull circuit. The output end of the choke coil T1 is respectively connected to the two normally closed contacts of the relay K5, and a capacitor C6 is also connected in parallel between the two output ends of the bridge push-pull circuit. The choke coil T1 and the capacitor C6 both have a filtering function, which can filter out the high-frequency pulse components output by the bridge push-pull circuit.

[0030] When the GPIO ports XLL1 and XLH2 of the ARM control chip U1 output high level, the field effect MOS tubes V5 and V8 are turned on, and the current flows from the source of the field effect MOS tube V5 to the drain of the field effect MOS tube V8. At this time, XLL2 and XLH1 of the ARM control chip U1 must be low level, otherwise the MOS tube will be short-circuited, resulting in a MOS tube burnout failure. Similarly, when the GPIO ports XLL2 and XLH1 of the ARM control chip U1 output high level, the field effect MOS tubes V6 and V7 are turned on, and the current flows from the source of the field effect MOS tube V6 to the drain of the field effect MOS tube V7. At this time, XLL1 and XLH2 of the ARM control chip U1 must be low level, otherwise the MOS tube will be short-circuited, resulting in a MOS tube burnout failure. At this time, the GPIO output port CK5 of the ARM control chip U1 is low level, the coil of the relay K5 is not turned on, and the normally open contact of the relay K5 connects the output terminals J1 and J2. The arrester monitoring device under test is in the process of leakage current detection. By adjusting the output voltage VL of the DC power supply of the DC voltage adjustable circuit M2, the amplitude of the output voltage can be changed. By adjusting the duty cycle of the output of the bridge push-pull circuit composed of field effect MOS tubes V5~V8, the effective value of the output voltage can be changed. In this way, a digitally adjustable stable voltage is obtained, and the arrester monitoring device can be continuously adjusted for leakage detection.

[0031] The ARM control chip U1 is also connected to the LCD serial screen M4 via the serial port UART communication. The receiving end RXD1 and the transmitting end TXD1 of the ARM control chip U1 are connected to the TXD transmitting end and the RXD receiving end of the LCD serial screen M4. The LCD serial screen M4 can communicate with the ARM control chip U1 via the UART serial port. The operator can view the relevant parameters of the lightning arrester monitoring device under test through the LCD serial screen M4, and query the performance of the lightning arrester monitoring device under test accordingly, such as displaying the impulse current test and leakage current test process, performing statistics of the impulse current test and leakage current test, and recording the impulse current test and leakage current test results, so as to facilitate human-computer interaction for the detection personnel.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In addition, in the present utility model, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can make the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] The above are only preferred embodiments of the present invention, and the present invention may also have other embodiments. For those skilled in the art, the technical solutions described in the above embodiments may still be modified, or some of the technical features may be replaced by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A portable lightning arrester monitoring device calibrator, characterized in that: It includes a lithium battery power supply, a DC high voltage generating circuit, a high voltage capacitor charging and discharging circuit, a MOS tube driving control circuit, an impact current / leakage current output circuit and an ARM control chip. The lithium battery power supply is electrically connected to the DC high voltage generating circuit for driving, the DC high voltage generating circuit is electrically connected to the high voltage capacitor charging and discharging circuit for charging and discharging, the ARM control chip is electrically connected to the DC high voltage generating circuit, the high voltage capacitor charging and discharging circuit, the MOS tube driving control circuit and the impact current / leakage current output circuit for realizing control, and the high voltage capacitor charging and discharging circuit and the MOS tube driving control circuit are respectively electrically connected to the impact current / leakage current output circuit for calibrating the lightning arrester monitoring device under test.

2. A portable lightning arrester monitoring device calibrator according to claim 1, characterized in that: The digital-to-analog conversion terminal of the ARM control chip is electrically connected to the voltage feedback terminal of the DC high-voltage generating circuit after being connected in series with a resistor.

3. A portable lightning arrester monitoring device calibrator according to claim 1, characterized in that: The high-voltage capacitor charging and discharging circuit includes a capacitor and a relay. The control end of the ARM control chip is connected in series with a resistor, a field effect transistor and a relay coil. The charging or discharging of the capacitor is achieved by controlling the closing or opening of the relay.

4. A portable lightning arrester monitoring device calibrator according to claim 1, characterized in that: The output end of the MOS tube driving control circuit is electrically connected to four field effect tubes, and the four field effect tubes are connected to form a bridge push-pull circuit.

5. A portable lightning arrester monitoring device calibrator according to claim 4, characterized in that: The two output ends of the bridge push-pull circuit are electrically connected to the two input ends of the choke coil, and a capacitor is connected in parallel between the two output ends of the bridge push-pull circuit.

6. A portable lightning arrester monitoring device calibrator according to claim 1, characterized in that: The impact current / leakage current output circuit includes a relay and an output terminal. The control end of the ARM control chip is connected in series with a resistor, a field effect transistor and a relay coil. The output terminal is connected to a lightning arrester monitoring device under test. The lightning arrester monitoring device under test is calibrated by controlling the closing or opening of the relay.

7. A portable lightning arrester monitoring device calibrator according to claim 6, characterized in that: One end of the output terminal is electrically connected to a cement resistor and then connected to a protective ground.

8. The portable lightning arrester monitoring device calibrator according to claim 1, characterized in that: The ARM control chip is communicatively connected to the LCD serial port screen.

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