CN113759224B - Cable terminal head discharge sensing measurement and control circuit, device and cable distribution box - Google Patents
Cable terminal head discharge sensing measurement and control circuit, device and cable distribution box Download PDFInfo
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- CN113759224B CN113759224B CN202111312969.9A CN202111312969A CN113759224B CN 113759224 B CN113759224 B CN 113759224B CN 202111312969 A CN202111312969 A CN 202111312969A CN 113759224 B CN113759224 B CN 113759224B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/08—Cable junctions
- H02G15/10—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes
Abstract
The invention discloses a cable terminal discharge sensing measurement and control circuit, a device and a cable distribution box, which comprise a current sensing module, a control module and a protection module; the current sensing module detects the discharge state of the cable terminal and outputs a current detection signal to the control module; the control module confirms whether the discharging current at the cable terminal is larger than the preset current or not according to the current detection signal, and triggers a preset protection signal to the protection module when the discharging current at the cable terminal is larger than the preset current; and the protection module executes corresponding protection actions when receiving the preset protection signal. The discharging state of the cable terminal is sensed and detected in real time, whether the discharging current of the current cable terminal is in a safe range or not is automatically identified according to the obtained current detection signal, and corresponding protection actions are automatically triggered when the discharging current exceeds the safe discharging range, so that the efficiency and reliability of discharging inspection of the cable terminal are effectively improved.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to a cable terminal discharge sensing measurement and control circuit, a cable terminal discharge sensing measurement and control device and a cable distribution box.
Background
Because the phenomenon of discharge caused by poor contact of the cable terminal in the cable distribution box causes frequent damage events of a busbar or a body of the cable distribution box, inspection personnel are required to check the phenomenon of discharge of the cable terminal in a power system, and the cable distribution box can work safely and reliably.
In the existing inspection work, an inspector usually performs manual operation on a cable terminal through a partial discharge detector to realize discharge measurement, the measurement efficiency is low, the discharge phenomenon of the cable terminal is difficult to find due to the fact that an instrument is forgotten or not equipped easily, and the like, so that the inspection efficiency and the reliability of the cable terminal are low.
Disclosure of Invention
In view of the above-mentioned deficiencies of the prior art, the present invention aims to provide a cable termination discharge sensing and monitoring circuit, a device and a cable distribution box, which aim to improve the efficiency and reliability of the discharge inspection of the cable termination.
The technical scheme of the invention is as follows:
a cable terminal head discharge sensing measurement and control circuit comprises a current sensing module, a control module and a protection module; the current sensing module detects the discharge state of the cable terminal and outputs a current detection signal to the control module; the control module confirms whether the discharging current at the cable terminal is larger than the preset current or not according to the current detection signal, and triggers a preset protection signal to the protection module when the discharging current at the cable terminal is larger than the preset current; and the protection module executes corresponding protection action when receiving the preset protection signal.
In one embodiment, the power supply module outputs a first voltage and a second voltage after performing voltage reduction processing on an input voltage, and the current sensing module and the control module are respectively supplied with power through the first voltage and the second voltage.
In one embodiment, the current induction module comprises a current mutual induction unit, a sampling unit and a conditioning unit; the current mutual inductance unit is sleeved at the cable terminal and converts the discharge current at the cable terminal into induction current; the sampling unit samples the current of the induced current and outputs a sampling signal to the conditioning unit; and the conditioning unit is used for conditioning the sampling signal and then outputting a current detection signal to the control module.
In one embodiment, the protection module comprises a plurality of warning lamps corresponding to the phase sequence of the cable termination, and the warning lamps are switched to a preset light state when receiving the preset protection signal.
In one embodiment, the protection module comprises a relay connected to the main cable, the relay switching to an off state upon receiving the preset protection signal.
In one embodiment, the power supply module includes a first inductor, a second inductor, a third inductor, a fourth inductor, a fifth inductor, a sixth inductor, a seventh inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a first resistor, a second resistor, a first diode, a second diode, a voltage reduction chip, a first voltage regulator, and a second voltage regulator;
one end of the first inductor is connected with a voltage input end, and the other end of the first inductor is connected with the anode of the first diode; the negative electrode of the first diode is connected with the positive electrode of the first capacitor and the 1 st pin of the voltage reduction chip; the negative electrode of the first capacitor is grounded through the second inductor; one end of the third inductor is connected with the No. 2 pin of the voltage reduction chip and the cathode of the second diode, and the other end of the third inductor is connected with one end of the first resistor, one end of the second capacitor and one end of the fourth inductor; the other end of the first resistor is connected with one end of the second resistor and the 4 th pin of the voltage reduction chip; the anode of the second diode, the other end of the second resistor and the other end of the second capacitor are all grounded; the other end of the fourth inductor is connected with one end of the third capacitor and the input end of the first voltage stabilizer; the other end of the third capacitor is grounded through the fifth inductor; one end of the fourth capacitor is connected with the output end of the first voltage stabilizer, one end of the fifth capacitor and one end of the sixth inductor, and the other end of the fourth capacitor is grounded; the other end of the fifth capacitor is connected with one end of the seventh inductor and the ground; one end of the sixth capacitor is connected with the other end of the sixth inductor and the current sensing module, and the other end of the sixth capacitor is connected with the other end of the seventh inductor and the ground; the anode of the seventh capacitor is connected with the output end of the first voltage stabilizer and the input end of the second voltage stabilizer, and the cathode of the seventh capacitor is grounded; the output end of the second voltage stabilizer is connected with the anode of the eighth capacitor, one end of a ninth capacitor and the control module; and the negative electrode of the eighth capacitor and the other end of the ninth capacitor are both grounded.
In one embodiment, the current transformer unit comprises a feedthrough current transformer, and the sampling unit comprises a current sensor, a tenth capacitor, an eleventh capacitor and a third resistor; the conditioning unit comprises a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, a sixteenth capacitor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first operational amplifier and a second operational amplifier;
a1 st pin and a2 nd pin of the current sensor are connected with a1 st connecting end of the secondary side of the feedthrough current transformer, a 3 rd pin and a 4 th pin of the current sensor are connected with a2 nd connecting end of the secondary side of the feedthrough current transformer, a 6 th pin of the current sensor is grounded through the tenth capacitor, a 7 th pin of the current sensor is connected with one end of the twelfth capacitor and one end of the fourth resistor through the third resistor, and an 8 th pin of the current sensor is connected with the power supply module and is also grounded through the eleventh capacitor; the other end of the fourth resistor is connected with the non-inverting input end of the first operational amplifier and is grounded through the thirteenth capacitor; the inverting input end of the first operational amplifier is connected with the output end of the first operational amplifier, the other end of the twelfth capacitor and one end of the sixth resistor; one end of the fourteenth capacitor and one end of the fifteenth capacitor are both connected with the power supply module, and the other end of the fourteenth capacitor and the other end of the fifteenth capacitor are both grounded; one end of the sixteenth capacitor is connected with a preset voltage end and one end of the fifth resistor, and the other end of the sixteenth capacitor is grounded; the other end of the fifth resistor is connected with the inverting input end of the second operational amplifier and one end of the seventh resistor; the other end of the sixth resistor is connected with the non-inverting input end of the second operational amplifier and one end of the eighth resistor, and the other end of the eighth resistor is grounded; the other end of the seventh resistor is connected with the output end of the second operational amplifier, one end of the ninth resistor and the control module; the other end of the ninth resistor is grounded.
In one embodiment, the control module employs a microcontroller of model STM32F103C8T 6.
The invention further provides a cable terminal discharge sensing measurement and control device, which comprises the cable terminal discharge sensing measurement and control circuit.
The invention further provides a cable distribution box, which comprises a distribution box body, wherein the cable terminal discharge sensing measurement and control device is arranged in the distribution box body.
Has the advantages that: the invention discloses a cable terminal discharge sensing measurement and control circuit, a device and a cable distribution box, compared with the prior art, the embodiment of the invention carries out real-time induction detection on the discharge state of a cable terminal, automatically identifies whether the current discharge current of the cable terminal is in a safe range according to the obtained current detection signal, and automatically triggers corresponding protection action when the current discharge current exceeds the safe discharge range, thereby effectively improving the efficiency and reliability of the discharge detection of the cable terminal.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a block diagram of a structure of a cable terminal discharge sensing measurement and control circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a first part of a power supply module in a cable termination discharge sensing measurement and control circuit according to an embodiment of the present invention;
fig. 3 is a second partial circuit diagram of a power supply module in the cable termination discharge sensing measurement and control circuit according to the embodiment of the present invention;
fig. 4 is a circuit diagram of a third part of a power supply module in the cable termination discharge sensing measurement and control circuit according to the embodiment of the present invention;
fig. 5 is a fourth partial circuit diagram of a power supply module in the cable termination discharge sensing measurement and control circuit according to the embodiment of the present invention;
fig. 6 is a circuit diagram of a current sensing module in the cable termination discharge sensing measurement and control circuit according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is described in further detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Embodiments of the present invention will be described below with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a block diagram of a structure of an embodiment of a cable termination discharge sensing measurement and control circuit provided in the present invention. During specific application, the cable terminal discharge sensing and control circuit detects the port discharge state of the cable terminal in the cable distribution box to ensure the safe operation of the cable distribution box, as shown in fig. 1, the cable terminal discharge sensing and control circuit comprises a current sensing module 10, a control module 20 and a protection module 30, wherein the current sensing module 10 is arranged at the cable terminal, the specific current sensing module 10 can be arranged at a preset distance (for example, 1cm, 2cm and the like) from the port of the cable terminal to perform real-time sensing detection on the discharge state of the cable terminal, the specific current sensing module 10 and the protection module 30 are both connected with the control module 20, the discharge state of the cable terminal is detected through the current sensing module 10 and a current detection signal is output to the control module 20, and the control module 20 determines whether the discharge current at the cable terminal is larger than a preset current according to the current detection signal And triggers a preset protection signal to the protection module 30 when the discharge current at the cable termination is greater than a preset current; the protection module 30 executes a corresponding protection action upon receiving the preset protection signal.
In this embodiment, the current sensing module 10 is disposed at the cable terminal in the cable distribution box to detect the discharging phenomenon at the port thereof in real time, and output the current detection signal detected in real time to the control module 20, and the control module 20 automatically analyzes and identifies the received current detection signal to determine whether the discharging current at the cable terminal exceeds the safety range, that is, whether the discharging current at the cable terminal is greater than the preset current, if so, a potential safety hazard may exist, at this time, the control module 20 triggers a protection mechanism to output a preset protection signal to the protection module 30 to instruct the protection module 30 to perform a corresponding protection action so as to isolate the discharging potential safety hazard at the cable terminal from the main cable in the cable distribution box, or prompt an operation and maintenance person to perform a replacement or maintenance operation on the cable terminal with the potential safety hazard in time, and so on, the method ensures that the discharge phenomenon of the cable terminal can be timely and accurately found, and effectively improves the efficiency and reliability of the discharge detection of the cable terminal through real-time detection and automatic identification of the discharge state. The specific control module 20 may adopt a microcontroller of the model STM32F103C8T6, and of course, in other embodiments, other controllers with the same function may also be adopted, which is not limited in this embodiment.
In one embodiment, the protection module 30 comprises a number of warning lamps corresponding to the phase sequence of the cable terminations, which upon receiving the preset protection signal switch to a preset light state.
In this embodiment, a protection action is performed by the warning lamp corresponding to the phase sequence of the cable terminal, that is, when the discharge current is greater than the preset current, the warning lamp corresponding to the phase sequence is controlled to output a warning signal, specifically, the warning lamp is switched to the preset light state, for example, if the warning lamp is in an off state during normal operation, the warning lamp is switched to an on state or a flashing state when the preset protection signal is received, and the like; on the contrary, if the warning lamp is in the lighting state during normal work, the preset protection signal is received, and then the preset protection signal is switched to be turned off or the light color different from that during normal work is obtained, and the preset light state can play an obvious fault area and a reminding role, so that operation and maintenance personnel can be reminded of the phenomenon that the discharge current is too large at the current cable terminal in time, and the safety of cable work is ensured.
In one embodiment, the protection module 30 comprises a relay connected to the main cable, said relay switching to an open state upon receiving said preset protection signal.
In this embodiment, take up through being connected with the main cable in the cable distribution box and carry out the protection action, when discharging current was greater than preset electric current promptly, then control electrical apparatus switches into the off-state for can keep apart the branch cable that has the too big condition of discharging current with the main cable, ensure the normal work of other cables in the cable distribution box, ensure that the cable distribution box can stabilize safe work.
In an embodiment, the cable termination discharge sensing measurement and control circuit further includes a power supply module 40, the power supply module 40 is connected to the current sensing module 10 and the control module 20, the power supply module 40 performs voltage reduction processing on the input voltage and outputs a first voltage and a second voltage, and the current sensing module 10 and the control module 20 are respectively supplied with power through the first voltage and the second voltage.
In this embodiment, the power supply module 40 may use a secondary power supply from a cable distribution box or a high-voltage board, and perform voltage reduction on the input voltage to obtain two paths of voltages, where one path is a first voltage output to the current sensing module 10 to supply power to the current sensing module, and the other path is a second voltage output to the control module 20 to supply power to the control module 20, so as to ensure that the current sensing module 10 and the control module 20 have reliable and stable power supplies, and improve the stability of circuit operation.
In one embodiment, as shown in fig. 2 to 5, the power supply module 40 includes a first inductor L1, a second inductor L2, a third inductor L3, a fourth inductor L4, a fifth inductor L5, a sixth inductor L6, a seventh inductor L7, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a first resistor R1, a second resistor R2, a first diode D1, a second diode D2, a buck chip U1, a first regulator U2, and a second regulator U3;
one end of the first inductor L1 is connected to a voltage input end, and the other end of the first inductor L1 is connected to the anode of the first diode D1; the cathode of the first diode D1 is connected with the anode of the first capacitor C1 and the 1 st pin of the buck chip U1; the negative electrode of the first capacitor C1 is grounded through the second inductor L2; one end of the third inductor L3 is connected to the 2 nd pin of the buck chip U1 and the cathode of the second diode D2, and the other end of the third inductor L3 is connected to one end of the first resistor R1, one end of the second capacitor C2, and one end of the fourth inductor L4; the other end of the first resistor R1 is connected with one end of the second resistor R2 and the 4 th pin of the buck chip U1; the anode of the second diode D2, the other end of the second resistor R2 and the other end of the second capacitor C2 are all grounded; the other end of the fourth inductor L4 is connected to one end of the third capacitor C3 and the input end of the first regulator U2; the other end of the third capacitor C3 is grounded through the fifth inductor L5; one end of the fourth capacitor C4 is connected to the output terminal of the first regulator U2, one end of the fifth capacitor C5 and one end of the sixth inductor L6, and the other end of the fourth capacitor C4 is grounded; the other end of the fifth capacitor C5 is connected with one end of the seventh inductor L7 and the ground; one end of the sixth capacitor C6 is connected to the other end of the sixth inductor L6 and the current sensing module 10, and the other end of the sixth capacitor C6 is connected to the other end of the seventh inductor L7 and ground; the anode of the seventh capacitor C7 is connected with the output end of the first voltage stabilizer U2 and the input end of the second voltage stabilizer U3, and the cathode of the seventh capacitor C7 is grounded; the output end of the second voltage stabilizer U3 is connected to the anode of the eighth capacitor C8, one end of a ninth capacitor C9 and the control module 20; the negative electrode of the eighth capacitor C8 and the other end of the ninth capacitor C9 are both grounded.
In this embodiment, the step-down chip U1 steps down the input voltage to output a dc low voltage (in this embodiment, + 12V), and then the first regulator U2 stabilizes the dc low voltage, and filters the output voltage (in this embodiment, + 5V) of the first regulator U2 through the capacitor inductor to output a stable first power supply voltage (in this embodiment, A5V) to supply power to the current sensing module 10; then, the output voltage of the first voltage stabilizer U2 is further subjected to voltage stabilization by a second voltage stabilizer U3, and a stable second power supply voltage (in this embodiment, +3V 3) is output after capacitive filtering to supply power to the control module 20, so as to provide reliable guarantee for stable power supply operation of each module in the cable terminal discharge sensing measurement and control circuit, wherein the voltage reduction chip U1 may adopt a DC-DC voltage reduction chip U1 of model xl7015, the first voltage stabilizer U2 may adopt a three-terminal voltage stabilization chip of model 7805, the second voltage stabilizer U3 may adopt a voltage stabilization chip of model LM1117-3.3V, of course, in other embodiments, other voltage reduction chips U1 or voltage stabilization chips having the same function may also be adopted, which is not limited in this embodiment.
In an embodiment, the current sensing module 10 includes a current transformer unit, a sampling unit 101 and a conditioning unit 102, wherein the current transformer unit is sleeved at a cable terminal, and specifically, the current transformer unit can be sleeved at a position spaced from a terminal of a port by a preset distance (for example, 1 cm) to perform current sensing, and the current transformer unit, the sampling unit 101 and the conditioning unit 102 are sequentially connected, and the conditioning unit 102 is further connected to the control module 20, wherein a discharge current at the cable terminal is converted into an induced current at a secondary side by the current transformer unit sleeved at the cable terminal, and then the sampling unit 101 performs current sampling on the induced current and outputs a corresponding sampling signal to the conditioning unit 102, and then the conditioning unit 102 performs signal conditioning on the sampling signal and outputs a current detection signal to the control module 20.
In this embodiment, when performing real-time sensing detection on the discharge current at the cable terminal, the ring-shaped current transformer unit is sleeved at the cable terminal, current conversion is conveniently and quickly performed on the discharge current at the cable terminal in an electromagnetic induction manner, so that a corresponding induced current is obtained at the secondary side of the current transformer unit to implement sensing detection of the discharge current, then a sampling unit 101 and a conditioning unit 102 are used to sample, amplify, filter and other signal conditioning on the induced current to obtain a digitized current detection signal, the current detection signal is output to the control module 20 to implement real-time, efficient and accurate discharge current detection, so that the control module 20 can analyze and restore the accurate current detection signal to obtain the real-time discharge current at the cable terminal, and further can timely instruct the protection module 30 to perform protection when the discharge current is too large, the discharging current at the cable terminal is ensured to be in a real-time controllable state, and the working safety of the cable distribution box is ensured.
In one embodiment, as shown in fig. 6, the current transformer unit includes a feedthrough current transformer (not shown), and the sampling unit 101 includes a current sensor U4, a tenth capacitor C10, an eleventh capacitor C11, and a third resistor R3; the conditioning unit 102 includes a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, a sixteenth capacitor C16, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first operational amplifier a1 and a second operational amplifier a 2;
a1 st pin and a2 nd pin of a current sensor U4 are connected with a1 st connection end of the secondary side of the core-through current transformer, a 3 rd pin and a 4 th pin of the current sensor U4 are connected with a2 nd connection end of the secondary side of the core-through current transformer, a 6 th pin of the current sensor U4 is grounded through the tenth capacitor C10, a 7 th pin of the current sensor U4 is connected with one end of the twelfth capacitor C12 and one end of the fourth resistor R4 through the third resistor R3, an 8 th pin of the current sensor U4 is connected with the power supply module 40 (specifically connected with one end of the sixth capacitor C6) and is also grounded through the eleventh capacitor C11; the other end of the fourth resistor R4 is connected to the non-inverting input terminal of the first operational amplifier A1 and also connected to ground through the thirteenth capacitor C13; the inverting input end of the first operational amplifier A1 is connected with the output end of the first operational amplifier A1, the other end of the twelfth capacitor C12 and one end of the sixth resistor R6; one end of the fourteenth capacitor C14 and one end of the fifteenth capacitor C15 are both connected to the power supply module 40 (specifically, one end of the sixth capacitor C6), and the other end of the fourteenth capacitor C14 and the other end of the fifteenth capacitor C15 are both grounded; one end of the sixteenth capacitor C16 is connected to a preset voltage terminal (1.35V in this embodiment) and one end of the fifth resistor R5, and the other end of the sixteenth capacitor C16 is grounded; the other end of the fifth resistor R5 is connected with the inverting input end of the second operational amplifier A2 and one end of the seventh resistor R7; the other end of the sixth resistor R6 is connected to the non-inverting input terminal of the second operational amplifier A2 and one end of the eighth resistor R8, and the other end of the eighth resistor R8 is grounded; the other end of the seventh resistor R7 is connected to the output end of the second operational amplifier a2, one end of the ninth resistor R9 and the control module 20 (specifically connected to an analog-to-digital conversion interface of the control module 20, for example, the 12 th pin of an STM32F103C8T6 microcontroller); the other end of the ninth resistor R9 is grounded. In this embodiment, the current sensor U4 is a hall current sensor U4 of the ACS712, but in other embodiments, other current sensors U4 with the same function may be used, and the present embodiment is not limited thereto.
In the embodiment, the feed-through current transformer is adopted to perform induction detection on the discharge current of the cable terminal, the feed-through current transformer is not provided with a primary winding in the structure, a current-carrying lead passes through a round iron core rolled by a silicon steel sheet to play a role of the primary winding, a secondary winding is directly and uniformly wound on the round iron core, the wire connection is simple and convenient to install, the feed-through current transformer can be directly sleeved on the cable terminal to perform induction detection on the discharge current, the induced current output by the two layers of the feed-through current transformer is accurately and efficiently sampled by a Hall current sensor U4 in a sampling unit 101, a corresponding sampling signal is output by a pin 7 of a current sensor U4, and in order to effectively filter higher harmonics in the sampling signal, a subsequent control module 20 can automatically obtain a digital accurate discharge current value, so that the sampling signal is filtered by a conditioning circuit formed by a second-order Butterworth filter, therefore, the discharge current of the analog quantity is processed into an accurate digital quantity current detection signal and is output to the control module 20, a partial discharge detector in a manual inspection mode is not needed, the discharge detection efficiency is effectively improved, the partial discharge detector is further analyzed and identified through the control module 20, the discharge state of the cable terminal head is guaranteed to be always maintained in a normal range, and the working reliability of each cable in the cable tapping box is improved.
According to the embodiments, the cable terminal discharge sensing measurement and control circuit provided by the invention has the advantages that the discharge state of the cable terminal is sensed and detected in real time, whether the discharge current of the current cable terminal is in the safe range or not is automatically identified according to the obtained current detection signal, and the corresponding protection action is automatically triggered when the discharge current exceeds the safe discharge range, so that the efficiency and the reliability of the discharge detection of the cable terminal are effectively improved.
Another embodiment of the present invention provides a cable terminal discharge sensing measurement and control device, which includes the cable terminal discharge sensing measurement and control circuit described above, and the cable terminal discharge sensing measurement and control circuit is described in detail above, and therefore, detailed description is omitted here.
Another embodiment of the present invention provides a cable distribution box, which includes a distribution box body, and the cable terminal discharge sensing and control device is included in the distribution box body.
In summary, the discharge sensing measurement and control circuit, device and cable tapping box of the cable terminal disclosed by the invention comprise a current sensing module, a control module and a protection module; the current sensing module detects the discharge state of the cable terminal and outputs a current detection signal to the control module; the control module confirms whether the discharging current at the cable terminal is larger than the preset current or not according to the current detection signal, and triggers a preset protection signal to the protection module when the discharging current at the cable terminal is larger than the preset current; and the protection module executes corresponding protection actions when receiving the preset protection signal. The discharging state of the cable terminal is sensed and detected in real time, whether the discharging current of the current cable terminal is in a safe range or not is automatically identified according to the obtained current detection signal, and corresponding protection actions are automatically triggered when the discharging current exceeds the safe discharging range, so that the efficiency and reliability of discharging inspection of the cable terminal are effectively improved.
Of course, it will be understood by those skilled in the art that all or part of the processes of the methods of the above embodiments may be implemented by instructing relevant hardware (such as a processor, a controller, etc.) through a computer program, which may be stored in a non-volatile computer-readable storage medium, and the computer program may include the processes of the above method embodiments when executed. The storage medium may be a memory, a magnetic disk, a floppy disk, a flash memory, an optical memory, etc.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (6)
1. A cable terminal discharge sensing measurement and control circuit is characterized by being used for detecting a port discharge state of a cable terminal in a cable distribution box and comprising a current sensing module, a control module and a protection module; the current sensing module is arranged at the cable terminal and has a preset distance with a port of the cable terminal, and the current sensing module detects the discharge state at the cable terminal and outputs a current detection signal to the control module; the control module confirms whether the discharging current at the cable terminal is larger than the preset current or not according to the current detection signal, and triggers a preset protection signal to the protection module when the discharging current at the cable terminal is larger than the preset current; the protection module executes corresponding protection actions when receiving the preset protection signal;
the cable terminal head discharge sensing measurement and control circuit further comprises a power supply module, wherein the power supply module outputs a first voltage and a second voltage after performing voltage reduction processing on input voltage accessed from a cable distribution box or a high-voltage cabinet secondary power supply, and the current sensing module and the control module are respectively supplied with power through the first voltage and the second voltage;
the power supply module comprises a first inductor, a second inductor, a third inductor, a fourth inductor, a fifth inductor, a sixth inductor, a seventh inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a first resistor, a second resistor, a first diode, a second diode, a voltage reduction chip, a first voltage stabilizer and a second voltage stabilizer, wherein the voltage reduction chip adopts a DC-DC voltage reduction chip with the model of xl 7015;
one end of the first inductor is connected with a voltage input end, and the other end of the first inductor is connected with the anode of the first diode; the negative electrode of the first diode is connected with the positive electrode of the first capacitor and the 1 st pin of the voltage reduction chip; the negative electrode of the first capacitor is grounded through the second inductor; one end of the third inductor is connected with the No. 2 pin of the voltage reduction chip and the cathode of the second diode, and the other end of the third inductor is connected with one end of the first resistor, one end of the second capacitor and one end of the fourth inductor; the other end of the first resistor is connected with one end of the second resistor and the 4 th pin of the voltage reduction chip; the anode of the second diode, the other end of the second resistor and the other end of the second capacitor are all grounded; the other end of the fourth inductor is connected with one end of the third capacitor and the input end of the first voltage stabilizer; the other end of the third capacitor is grounded through the fifth inductor; one end of the fourth capacitor is connected with the output end of the first voltage stabilizer, one end of the fifth capacitor and one end of the sixth inductor, and the other end of the fourth capacitor is grounded; the other end of the fifth capacitor is connected with one end of the seventh inductor and the ground; one end of the sixth capacitor is connected with the other end of the sixth inductor and the current sensing module, and the other end of the sixth capacitor is connected with the other end of the seventh inductor and the ground; the anode of the seventh capacitor is connected with the output end of the first voltage stabilizer and the input end of the second voltage stabilizer, and the cathode of the seventh capacitor is grounded; the output end of the second voltage stabilizer is connected with the anode of the eighth capacitor, one end of a ninth capacitor and the control module; the negative electrode of the eighth capacitor and the other end of the ninth capacitor are both grounded;
the current induction module comprises a current mutual inductance unit, a sampling unit and a conditioning unit; the current mutual inductance unit is sleeved at the cable terminal, particularly at a position spaced from the tail end of the port by a preset distance for current induction, and converts the discharge current at the cable terminal into induction current; the sampling unit samples the current of the induced current and outputs a sampling signal to the conditioning unit; the conditioning unit is used for conditioning the sampling signal and then outputting a current detection signal to the control module, so that the control module can analyze and restore the current detection signal to obtain a real-time discharge current at the cable terminal, and can further timely instruct the protection module to execute a protection action when the discharge current is too large, thereby ensuring that the discharge current at the cable terminal is in a real-time controllable state and ensuring the working safety of the cable tapping box;
the current mutual inductance unit comprises a straight-through current transformer, and the sampling unit comprises a current sensor, a tenth capacitor, an eleventh capacitor and a third resistor; the conditioning unit comprises a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, a sixteenth capacitor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first operational amplifier and a second operational amplifier;
the current sensor is a Hall current sensor with the model of ACS712, the 1 st pin and the 2 nd pin of the current sensor are connected with the 1 st connecting end of the secondary side of the feedthrough current transformer, the 3 rd pin and the 4 th pin of the current sensor are connected with the 2 nd connecting end of the secondary side of the feedthrough current transformer, the 6 th pin of the current sensor is grounded through the tenth capacitor, the 7 th pin of the current sensor is connected with one end of the twelfth capacitor and one end of the fourth resistor through the third resistor, and the 8 th pin of the current sensor is connected with the power supply module and is also grounded through the eleventh capacitor; the other end of the fourth resistor is connected with the non-inverting input end of the first operational amplifier and is grounded through the thirteenth capacitor; the inverting input end of the first operational amplifier is connected with the output end of the first operational amplifier, the other end of the twelfth capacitor and one end of the sixth resistor; one end of the fourteenth capacitor and one end of the fifteenth capacitor are both connected with the power supply module, and the other end of the fourteenth capacitor and the other end of the fifteenth capacitor are both grounded; one end of the sixteenth capacitor is connected with a preset voltage end and one end of the fifth resistor, and the other end of the sixteenth capacitor is grounded; the other end of the fifth resistor is connected with the inverting input end of the second operational amplifier and one end of the seventh resistor; the other end of the sixth resistor is connected with the non-inverting input end of the second operational amplifier and one end of the eighth resistor, and the other end of the eighth resistor is grounded; the other end of the seventh resistor is connected with the output end of the second operational amplifier, one end of the ninth resistor and the control module; the other end of the ninth resistor is grounded.
2. The cable termination discharge sensing measurement and control circuit according to claim 1, wherein the protection module comprises a plurality of warning lamps corresponding to a phase sequence of the cable termination, and the warning lamps are switched to a preset light state when receiving the preset protection signal.
3. The cable termination discharge sensing measurement and control circuit of claim 1, wherein the protection module comprises a relay connected to the main cable, the relay switching to an off state upon receiving the predetermined protection signal.
4. The cable termination discharge sensing and control circuit according to any one of claims 1 to 3, wherein the control module is a microcontroller of type STM32F103C8T 6.
5. A cable termination discharge sensing measurement and control device, characterized by comprising the cable termination discharge sensing measurement and control circuit according to any one of claims 1 to 4.
6. A cable distribution box comprises a distribution box body, and is characterized in that the cable terminal discharge sensing measurement and control device as claimed in claim 5 is arranged in the distribution box body.
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