CN214953952U - Capacitor power-taking switch with fault diagnosis function - Google Patents
Capacitor power-taking switch with fault diagnosis function Download PDFInfo
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- CN214953952U CN214953952U CN202120350375.6U CN202120350375U CN214953952U CN 214953952 U CN214953952 U CN 214953952U CN 202120350375 U CN202120350375 U CN 202120350375U CN 214953952 U CN214953952 U CN 214953952U
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Abstract
The utility model provides a switch and method are got to electric capacity with fault diagnosis function, this switch includes high-voltage capacitor, protection module, get electric unit and measurement and control unit, insert current measurement sensor between protection module and earthing terminal, high-voltage capacitor's second end is connected with protection module's first end, protection module's second end is connected with current measurement sensor's first end, current measurement sensor's second end ground connection, the first end of getting the electric unit is connected to protection module's first end, the second end of getting the electric unit is connected to current measurement sensor's second end, the third end output voltage signal of getting the electric unit is to measurement and control unit, current measurement sensor's third end output protection module's current signal is to measurement and control unit. The utility model discloses a FTU that existing switch connects has the resource, carries out the divide-shut brake time characteristic that analysis can obtain the switch to data to judge whether the switch is in normal condition.
Description
Technical Field
The utility model relates to a distribution automation technical field especially relates to a switch is got to electric capacity with fault diagnosis function.
Background
The power distribution switch is used as a link between a power distribution network and a user, and the reliable operation of the power distribution switch has great significance for ensuring the reliability of power supply. Distribution switches play two roles in the distribution network: the control function is that a part of electrical equipment or lines are put into or quit the running state according to the running requirement of the power distribution network; and the second protection function is that when the electrical equipment or the line has a fault, the fault part is quickly removed from the power grid through the action of the relay protection and the automatic device, so that the fault-free operation of the power grid is protected. With the development of economy, the transformation of power distribution networks in China and the deepening of intelligent power grid construction, the pole top switch, particularly the primary and secondary fusion pole top switch, has wide requirements. Hundreds of thousands of them are put into use every year. In recent years, the capacitor electricity-taking primary and secondary fusion column switch gradually replaces the traditional PT electricity-taking primary and secondary fusion column switch due to the advantages of no explosion hidden danger and the like, so that the capacitor electricity-taking primary and secondary fusion column switch has important significance for fault diagnosis, particularly early fault diagnosis of the capacitor electricity-taking primary and secondary fusion column switch.
The existing capacitor power-taking switches have a fault processing mode of passively replacing after faults occur, and measures for early fault prevention of the switches are lacked. The capacitor electricity-taking primary and secondary fusion switch is a power distribution automatic switch with higher intelligent degree, has the functions of current and voltage sampling, line protection, communication and the like, but the resources are not utilized to the maximum extent at present.
In practical use, the switch-on and switch-off characteristic is the most affected by the multi-power-supply reliability, in the switch-on and switch-off characteristic, the switch-on and switch-off time and the different phases are the most important two parameter values, and the mechanical fault of the switch is finally expressed as abnormal switch-on and switch-off. Therefore, whether the current operation of the switch is in a normal state or not can be basically clear through the switching-on and switching-off process. The conventional method for analyzing the opening and closing processes is to analyze by using displacement-current and displacement-voltage curves by a method of installing a displacement sensor in a switch. However, this approach requires redesign of the switch, adding cost, especially for molded, stable switches and a large number of already-in-service switches, where adding a displacement sensor is not possible.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a need not increase displacement sensor, the FTU that connects through existing switch and connects has the resource, carries out the divide-shut brake time characteristic that analysis can obtain the switch to data to judge whether the switch is in normal condition's the electric capacity that has the failure diagnosis function and get the electric switch.
In order to achieve the above main objective, the present invention provides a capacitor power switch with a fault diagnosis function, comprising a high voltage capacitor, a protection module, a power taking unit with electrical isolation and a measurement and control unit, wherein a current measurement sensor is connected between the protection module and a ground terminal, a first end of the high voltage capacitor is connected to any one of A, B, C three phases of a power line, a second end of the high voltage capacitor is connected to the first end of the protection module, a second end of the protection module is connected to the first end of the current measurement sensor, a second end of the current measurement sensor is grounded, the first end of the power taking unit is connected to the first end of the protection module, the second end of the power taking unit is connected to the second end of the current measurement sensor, and a third end of the power taking unit outputs a voltage signal to the measurement and control unit, and the third end of the current measuring sensor outputs a current signal of the protection module to the measurement and control unit, wherein the measurement and control unit is used for measuring voltage and current signals and controlling the switch, and when the measurement and control unit detects that the sampling data is abnormal, the measurement and control unit sends alarm information to the master station.
In a further scheme, a single-phase, two-phase or three-phase power taking mode can be selected among the high-voltage capacitor, the protection module and the power taking unit to supply power.
In a further scheme, the protection module is a piezoresistor array, the piezoresistor array is composed of a plurality of piezoresistors connected in series, and each piezoresistor is arranged according to creepage distance or insulation grade distance and sequentially arranged on a circuit main board of the protection module in series.
In a further scheme, the power taking unit comprises an isolation transformer, a rectification filter circuit and a voltage stabilizing circuit, a primary side coil of the isolation transformer is connected with two ends of the protection module, two ends of a secondary side coil of the isolation transformer are connected to the rectification filter circuit, the voltage stabilizing circuit is arranged at an output end of the rectification filter circuit, and an output end of the rectification filter circuit is connected with an input end of the voltage stabilizing circuit.
Therefore, the utility model provides a carry out simple hardware change to current module, can carry out fault diagnosis to protection module and the electric module of getting of taking the electrical isolation, utilize the existing resource of switch and FTU, carry out the analysis to the sampled data, can obtain the divide-shut brake asynchronous state and the divide-shut brake time of switch operation in-process to judge the operating characteristic of switch and then carry out early diagnosis to the trouble of switch.
Therefore, the utility model does not increase the hardware overhead, and utilizes the sampling data to analyze the switch different periods and the opening and closing time as well as the voltage difference of the power supply side and the load side, thereby carrying out early diagnosis on the mechanical fault of the switch, changing ' passive power failure into ' active prevention ', and being beneficial to improving the reliability of power supply; the protection circuit and the power taking circuit behind the high-voltage power taking capacitor are divided into a protection module and a power taking module with electrical isolation, the FTU detects the protection module and the power taking module, and when a fault occurs, the FTU can send an alarm signal to a master station and remind operation and maintenance personnel to carry out quick and accurate online electrification replacement, so that power failure is avoided, power failure economic loss can be reduced, and power supply reliability is improved.
Drawings
Fig. 1 is a schematic diagram of an embodiment of a capacitor power-taking switch with a fault diagnosis function according to the present invention.
Fig. 2 is a schematic circuit diagram of a power-taking unit in an embodiment of the capacitor power-taking switch with the fault diagnosis function of the present invention.
Fig. 3 is a schematic circuit diagram of a protection module in an embodiment of a capacitor power-taking switch with a fault diagnosis function of the present invention.
Fig. 4 is a schematic circuit diagram of a starting circuit for timing the closing time in the embodiment of the capacitor power switch with the fault diagnosis function of the present invention.
The present invention will be further explained with reference to the drawings and examples.
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined below to clearly and completely describe the technical solution of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.
Referring to fig. 1, the utility model discloses a capacitor power switch with fault diagnosis function, including a high voltage capacitor 10, a protection module 20, a power unit 30 with electrical isolation and a measurement and control unit 40, a current measurement sensor 50 is connected between the protection module 20 and a ground terminal, a first end of the high voltage capacitor 10 is connected with any one of A, B, C three phases of a power line, a second end of the high voltage capacitor 10 is connected with a first end of the protection module 20, a second end of the protection module 20 is connected with a first end of the current measurement sensor 50, a second end of the current measurement sensor 50 is grounded, a first end of the power unit 30 is connected to a first end of the protection module 20, a second end of the power unit 30 is connected to a second end of the current measurement sensor 50, a third end of the power unit 30 outputs a voltage signal to the measurement and control unit 40, a third end of the current measurement sensor 50 outputs a current signal of the protection module 20 to the measurement and control unit 40, the measurement and control unit 40 is used for measuring voltage and current signals, controlling the switch, and sending alarm information to the master station when the measurement and control unit 40 detects that the sampling data is abnormal.
The high-voltage capacitor 10, the protection module 20 and the power taking unit 30 can be powered by selecting a single-phase, two-phase or three-phase power taking mode.
For example, in the three-phase current-taking mode, three high-voltage capacitors 10 are provided, and parallel connection of the three capacitors is easily achieved by providing leads on the terminal block. The terminal block can be provided with three capacitors corresponding to the three-phase capacitor C1, and the three-phase capacitor can be applied to single-phase or three-phase conditions.
Referring to fig. 2, the power taking unit 30 includes an isolation transformer B1, a rectification filter circuit, and a voltage regulator circuit, a primary side coil of the isolation transformer B1 is connected to two ends of the protection module 20, two ends of a secondary side coil of the isolation transformer B1 are connected to the rectification filter circuit, the output end of the rectification filter circuit is provided with the voltage regulator circuit, and the output end of the rectification filter circuit is connected to the input end of the voltage regulator circuit.
Specifically, the voltage signal V1 is connected to one end of the high-voltage capacitor 10(C1), the other end of the high-voltage capacitor 10 is simultaneously connected to one end of the primary side coil of the isolation transformer B1, the other end of the primary side coil of the isolation transformer B1 is grounded, and the protection module 20 and the current measurement sensor 50 are connected in parallel to two ends of the primary side coil of the isolation transformer B1.
Two ends of a group of secondary side coils of the isolation transformer B1 are connected with two ends of a resistor R1, and the resistor R1 is a damping resistor. Two ends of a group of secondary side coils of the isolation transformer B1 are connected to the input end of a rectifier bridge circuit, the rectifier bridge circuit is a full-wave rectifier circuit formed by diodes D1-D4, a capacitor C3 is connected in parallel between the output ends of the rectifier bridge circuit, the rectifier bridge circuit formed by diodes D1-D4 and a capacitor C3 playing a role in filtering form the rectifier filter circuit.
A voltage division branch formed by connecting resistors R2-R3 in series and a voltage stabilizing device D5 are also connected in parallel between the output anode and the output cathode of the rectifier bridge circuit, and the voltage stabilizing device D5 is realized by a controllable precise voltage stabilizing source with the model number of TL 431. The cathode of the voltage stabilizing device D5 is connected with the output anode of the rectifier bridge circuit, the anode is connected with the output cathode of the rectifier bridge circuit, and the reference electrode of the voltage stabilizing device D5 is connected between the resistors R2-R3. The voltage across the voltage regulator device D5(TL431) depends on the resistance values of the resistors R2 to R3, and it is known in the art that the voltage U at the output terminal of the voltage regulator device D5 is (1+ R2/R3) · 2.5V, so that the voltage at the output terminal of the voltage regulator device D5 can be within the required operating voltage range at the input terminal of the voltage conversion circuit by adjusting the resistance values of the resistors R2 to R3. The resistors R2-R3 and the voltage stabilizing device D5 form the voltage stabilizing circuit.
The voltage at the output end of the voltage stabilizing device D5 is connected to the input end of the voltage stabilizing chip U2, the voltage stabilizing chip U2 can be realized by a commercially available common DC/DC voltage stabilizing chip according to the power supply requirement of the power supply equipment, and a voltage signal output by the voltage stabilizing chip U2 is transmitted to the measurement and control unit 40 (U3).
In this embodiment, the high-voltage capacitor 10 is formed by connecting a plurality of CB81 cylindrical film capacitors having a dc withstand voltage of 80kV in series.
It can be seen that the high-voltage capacitor 10 can be realized by using one capacitor or by using a plurality of capacitors connected in series, and the high-voltage capacitor 10 of the present embodiment uses a high-voltage ceramic capacitor, and the special series structure is suitable for long-term reliable operation under high voltage.
Further, the protection module 20 is a voltage dependent resistor array. Referring to fig. 3, the protection module includes an input terminal 100, a varistor array and an output terminal 200, where the varistor array is formed by a plurality of series-connected varistors, such as varistors RV 1-RV 30, and the varistors are arranged according to a creepage distance or an insulation grade distance and are sequentially arranged in series on a circuit board of the protection module 20.
Preferably, the piezoresistor is a metal electrooxidate piezoresistor, the reaction speed is high, the quick response time is less than 10ns, and the quick response can ensure that better protection equipment or a port is not influenced by surge current.
The protection module 20 of the embodiment adopts a piezoresistor array type, is independently made into a module, is placed at the front end of the power taking unit 30, is connected with the power taking unit 30 in parallel, can resist surge impact, particularly impact with long duration, and remarkably reduces the temperature rise of each device under extreme conditions by a processing method of dispersing concentrated heat, so that the damage of the excessive temperature rise to the device is avoided, the purpose of protecting the device is achieved, and the working reliability of the whole system is improved.
In practical application, the power-taking loop of this embodiment is specifically: the first conductor 1 is connected to a phase of the power line (e.g., phase a in the figure), and since the reactance of the high-voltage capacitor 10 is high, the voltage drop is greatly reduced after passing through the high-voltage capacitor 10. After the current has passed through the second conductor 2, there are two branches. However, under the condition that the line voltage is normal, the voltage across the protection module 20 is relatively low and does not reach the starting voltage, so that the protection module 20 does not work, that is, almost no current flows through the protection module; at this time, all the current flowing out of the high-voltage capacitor 10 flows through the "electricity taking module with electrical isolation", and then enters the ground through the third wire 3 and the current measuring sensor 50.
If the high-voltage capacitor 10 breaks down and short-circuits occur, the voltage across the protection module 20 will increase sharply, and the protection module 20 will start to operate immediately and start flowing current. Since the reactance of the "power-taking module with electrical isolation" is high, the current flowing through it is negligible compared to the protection module 20, and therefore the current on the wires 1, 2, 3 and 4 increases sharply when the high-voltage capacitor 10 breaks down.
If it is ensured that the entire paths of the second wire 2, the third wire 3 and the protection module 20 have enough wire diameters and are made of the same copper material, but the wire diameter of the first wire 1 is far smaller than that of the paths, when a current path composed of the first wire 1, the high-voltage capacitor 10, the second wire 2, the protection module 20 and the third wire 3 flows through a breakdown large current, the heat generation is different in unit length: if the wire diameter of the second wire 2 and the third wire 3 is 2 times that of the first wire 1, the instantaneous heat generation per unit length on the first wire 1 is 4 times that of the second wire 2 and the third wire 3, and in the case that the current is increased sharply and the wires do not reach the heat dissipation, the temperature increase on the first wire 1 is far more than that of the second wire 2 and the third wire 3 and the protection module 20, so that the first wire 1 is necessarily fused firstly. After the first lead 1 is fused, the high voltage is isolated, so that the protection module 20 which is possibly contacted and the electricity taking module with the electric isolation become safe regions, and the electric shock risk caused by the fact that the second lead 2 and the third lead 3 are blown, namely the inner conductor of the protection module 20 is eliminated.
The utility model also provides a pair of fault diagnosis method of switch is got to electric capacity with fault diagnosis function, electric capacity get the electric switch and adopt foretell electric capacity to get the electric switch, the method includes following step: removing PT, adopting a capacitance electricity taking switch to take electricity, obtaining high-voltage alternating current on a power grid, and carrying out voltage reduction treatment on the high-voltage alternating current; when an opening/closing signal is detected, the measurement and control unit 40 sends an opening/closing instruction to connect a power supply line; a, B, C three-phase switching-on/off time is obtained and respectively comprises Ta, Tb and Tc, absolute values of Ta-Tb, Ta-Tc and Tb-Tc are compared with a standard specified value, if the absolute values are larger than the standard specified value, the abnormal state of the switch in different phases can be determined, and alarm information is sent to a main station; if any time in Ta, Tb and Tc is greater than the standard maximum opening/closing time, the abnormal opening/closing of the switch can be determined, and alarm information is sent to the main station.
For example, in the present embodiment, the standard predetermined value of the spring operation mechanism switch is 2ms at most, as shown in table (1):
watch (1)
The standard maximum closing/opening time of the spring operation mechanism switch in the table (1) is 60ms/45 ms.
For a permanent magnetic mechanism switch, acquiring the switching-off/switching-on time specifically comprises: the time from the time when the operation command of the measurement and control unit 40 is issued to the time when the current signal is detected in the line can be determined as the opening/closing time.
For a permanent magnetic mechanism switch, acquiring the switching-off/switching-on time specifically comprises: the time from the start of the operation command of the measurement and control unit 40 until the moment when the voltage signal is detected on the switching load side can be determined as the opening/closing time.
Further, when the voltage difference between the load side and the power supply side of the switch exceeds a preset value, the contact failure of the switch contact is determined, and warning information is sent to the master station.
In addition, when the voltage difference between the load side and the power supply side exceeds a certain value, the switch contact can be judged to be in poor contact, and an alarm signal is sent to a master station to remind operation and maintenance personnel to overhaul.
Further, when the measurement and control unit 40 sends a closing instruction, a closing loop is connected, a closing coil is powered, a contact is connected and a power supply line is connected.
For the spring operation mechanism switch, the acquiring of the switching-off/switching-on time specifically comprises the following steps: the action command of the measurement and control unit 40 is sent to start timing until the moment that a voltage signal is detected at the switch load side, and then the action time of the relay is subtracted to obtain the switch on/off time.
Specifically, in the spring-operated mechanism switch, the operating time of each relay is different for the switch-on and switch-off of the spring-operated mechanism switch controlled by the relay, so that the above-mentioned operating time of the relay is generally only approximate to 8 ms.
In this embodiment, the utility model discloses a closing circuit is as shown in fig. 4, and fig. 4 is closing time timing starting point circuit to detect the divide-shut brake circuit and start the starting point for the timing when having the electric current, carry out the precision measurement to Ta, Tb and Tc.
When the singlechip sends a switching-off instruction (namely when the control port value of the measurement and control unit is at a high level), the switching tube Q1 is conducted, the relay K1 is attracted, the switching-on coil J1 is electrified at the moment, voltage is generated on the resistor R20, the voltage can be detected through AD sampling, and the voltage is used as a timing starting point of switching-on at the moment, so that the timing starting point of the switching-on time can be accurately obtained, and the switching-on time can be accurately measured.
Similarly, the starting circuit for the gate-off time timing is similarly arranged, so that the gate-off time can be accurately measured.
In practical application, the current measuring sensor 50 converts the actual current into a voltage signal, and after signal processing, the voltage signal is converted into a digital signal by an AD converter, and the measurement and control unit 40 performs operation processing on the digital signal.
When the switch is not closed, the current is zero.
The switching-on process of the switch is as follows: when the measurement and control unit 40 matched with the switch detects that a closing signal (possibly a closing signal such as key operation, remote control operation, reclosing and the like) exists, the measurement and control unit 40 sends a closing instruction, a closing loop is connected, a closing coil is electrified, the mechanism acts until the contact is connected, and a power supply line is connected. At the moment when the switch is turned on, even if there is no load, the transformer is also behind the switch, and a current (surge current generated by transformer excitation) is generated, and the current can be detected by the measurement and control unit 40 through the hardware circuit with high precision and wide range.
The switches may be classified into a spring-operated mechanism switch and a permanent magnet mechanism switch according to the type of mechanism. The two types of switches are different in mechanism driving mode, the driving current ratio of the spring operation mechanism switch is small, and the spring operation mechanism switch is only required to be generally used by a relay contact. If the relay control is adopted, the action time of the relay is deducted from the action time when the closing time is calculated; the permanent magnet mechanism switch is generally driven by an IGBT, the response speed of the IGBT is high, and the coil is powered immediately after an action command is sent out, and does not have time delay, namely acts simultaneously instantly. In addition, the operating speeds of the two switches are also relatively different.
In summary, if the measurement and control unit 40 sends an action command to start timing, and the line is detected to stop at the moment when the current is detected, for the permanent magnetic mechanism switch, the time is the switch-on time of the switch; for the spring-operated mechanism switch, the action time (generally 8ms) of the relay is subtracted from the action time, namely the closing time of the switch.
The closing time measured by A, B, C three phases is respectively Ta, Tb and Tc, if the absolute values of Ta-Tb, Ta-Tc and Tb-Tc are compared with the standard specified value, if the absolute values are more than the standard specified value, the abnormal state of the switch in different periods can be judged, alarm information can be sent to the main station, and operation and maintenance personnel can process the abnormal state in time.
If any one time in Ta, Tb and Tc is greater than the standard maximum closing time, judging that the switch is abnormal in closing; particularly, when a certain value is far longer than the normal closing time, the switch can be judged to be blocked, and alarm information can be sent to the main station to remind operation and maintenance personnel to process in time.
Because the serious fault of the switch is generally a gradual change process, operation and maintenance personnel can know the early abnormal condition of the switch-on of the switch in advance and prevent the fault.
Similarly, the fault diagnosis of the opening process can be measured by a method of measuring the current.
In this embodiment, the power-taking unit 30 with electrical isolation outputs a voltage signal, and after signal processing, the voltage signal is converted into a digital signal by an AD converter, and the measurement and control unit 40 performs operation processing on the digital signal.
When the switch is not closed, the voltage on the load side of the switch is zero.
The switching-on process of the switch is as follows: when the measurement and control unit 40 matched with the switch detects that a switching-on signal (possibly a switching-on signal such as key operation, remote control operation, reclosing and the like) exists, the measurement and control unit 40 sends a switching-on instruction, a switching-on loop is connected, a switching-on coil is electrified, a mechanism acts until a contact is connected, a power supply line is connected, and the measurement and control unit 40 in the hardware circuit can detect the voltage of a load side of the switch.
As in the above-mentioned current measurement method, if the starting timing is given by the switching-on command of the measurement and control unit 40, and the instant when the voltage is detected on the load side of the switch is detected, for the permanent magnetic mechanism switch, the time is the switching-on time of the switch; for the spring-operated mechanism switch, the action time (generally 8ms) of the relay is subtracted from the action time, namely the closing time of the switch.
Similarly, the closing time measured by A, B, C three phases is respectively Ta, Tb and Tc, if the absolute values of Ta-Tb, Ta-Tc and Tb-Tc are compared with the standard specified value, if the absolute values are more than the standard specified value, the switch can be judged to have abnormal in different periods, alarm information can be sent to the main station, and operation and maintenance personnel can process the abnormal switch in time.
If any one time in Ta, Tb and Tc is greater than the standard maximum closing time, judging that the switch is abnormal in closing; particularly, when a certain value is far longer than the normal closing time, the switch can be judged to be blocked, and alarm information can be sent to the main station to remind operation and maintenance personnel to process in time.
Also, it is possible to diagnose a malfunction of the switching process by measuring the power source side and load side voltages.
In addition, when the voltage difference between the load side and the power supply side exceeds a certain value, the switch contact can be judged to be in poor contact, and an alarm signal is sent to a master station to remind operation and maintenance personnel to overhaul.
The utility model discloses carry out simple hardware change to current module, can carry out fault diagnosis to protection module 20 and the electric module of getting that takes electric isolation, as follows:
(1) fault diagnosis of the protection module 20: a current measuring sensor 50 is connected between the protection module 20 and the ground, and when the protection module 20 is normal, the current is in the order of 10 μ a, otherwise, a fault occurs. The fault can be that the piezoresistor is short-circuited or broken circuit caused by high-energy lightning stroke, the current is mA grade when short-circuited and 0 when broken circuit.
(2) And (3) fault diagnosis of the electricity taking module with electric isolation: the fault diagnosis of the module is very simple, and only the output voltage of the module needs to be detected: when the output is a design voltage, generally 27V (supplied to the storage battery or super capacitor for energy storage), it is normal, and when the output deviates from the design voltage more than a certain value, and when the current of the protection module 20 is normal or zero, it is determined that the module is damaged.
When the two modules are damaged, the measurement and control unit 40 transmits fault information to the main station to inform operation and maintenance personnel to overhaul, and the modules can be replaced without power outage by matching with special tools.
Therefore, the utility model does not increase the hardware cost, and utilizes the current sampling data to analyze the switch asynchronous time and the opening and closing time, thereby carrying out early diagnosis on the switch fault; the method has the advantages that hardware cost is not increased, voltage sampling data are utilized, and the different phases and the opening and closing time of the switch are analyzed, so that the switch fault is diagnosed early; hardware detection of opening and closing loop current detection is added, and data of different phases and opening and closing time of the switch can be accurately obtained, so that early diagnosis of switch faults can be more accurately carried out; when voltage method data is detected, when the voltage difference between the load side and the power supply side exceeds a certain value, the switch contact can be judged to be in poor contact, and an alarm signal is sent to a master station to remind operation and maintenance personnel to overhaul; the protection circuit and the power-off circuit behind the high-voltage power-off capacitor are divided into a protection module 20 and a power-off unit 30 with electrical isolation, and the FTU detects the protection circuit and the power-off unit, and can send an alarm signal to a master station to remind operation and maintenance personnel of overhauling when a fault occurs.
Therefore, the utility model provides a carry out simple hardware change to current module, can carry out fault diagnosis to the power module of getting that protection module 20 and electrified gas keep apart, utilize the existing resource of switch and FTU, carry out the analysis to the sampled data, can obtain the divide-shut brake asynchronous state and the divide-shut brake time of switch operation in-process to judge the operating characteristic of switch and then carry out early diagnosis to the trouble of switch.
Therefore, the utility model does not increase the hardware overhead, and utilizes the sampling data to analyze the switch different periods and the opening and closing time as well as the voltage difference of the power supply side and the load side, thereby carrying out early diagnosis on the mechanical fault of the switch, changing ' passive power failure into ' active prevention ', and being beneficial to improving the reliability of power supply; the protection circuit and the power taking circuit behind the high-voltage power taking capacitor are divided into a protection module 20 and a power taking module with electric isolation, the FTU detects the protection circuit and the power taking circuit, and when a fault occurs, the FTU can send an alarm signal to a master station and remind operation and maintenance personnel to carry out quick and accurate online electrification replacement, so that power failure is avoided, power failure economic loss can be reduced, and power supply reliability is improved.
It should be noted that the above is only the preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and all the insubstantial modifications made by using the design concept of the present invention also fall within the protection scope of the present invention.
Claims (4)
1. A capacitance power-taking switch with a fault diagnosis function is characterized by comprising:
the high-voltage capacitor, the protection module, the electricity taking unit with electrical isolation and the measurement and control unit are connected with a current measurement sensor between the protection module and a grounding end, the first end of the high-voltage capacitor is connected with any one of A, B, C three phases of a power line, the second end of the high-voltage capacitor is connected with the first end of the protection module, the second end of the protection module is connected with the first end of the current measurement sensor, the second end of the current measurement sensor is grounded, the first end of the electricity taking unit is connected to the first end of the protection module, the second end of the electricity taking unit is connected to the second end of the current measurement sensor, the third end of the electricity taking unit outputs a voltage signal to the measurement and control unit, and the third end of the current measurement sensor outputs a current signal of the protection module to the measurement and control unit, the measurement and control unit is used for measuring voltage and current signals, controlling the switch and sending alarm information to the main station when the measurement and control unit detects that the sampling data is abnormal.
2. The capacitance power-taking switch according to claim 1, characterized in that:
the high-voltage capacitor, the protection module and the power taking unit can be powered by selecting a single-phase, two-phase or three-phase power taking mode.
3. The capacitance power-taking switch according to claim 1, characterized in that:
the protection module is a piezoresistor array, the piezoresistor array is composed of a plurality of piezoresistors connected in series, and each piezoresistor is arranged according to creepage distance or insulation grade distance and is sequentially connected in series on a circuit main board of the protection module.
4. The capacitance power-taking switch according to claim 1, characterized in that:
the power taking unit comprises an isolation transformer, a rectification filter circuit and a voltage stabilizing circuit, a primary side coil of the isolation transformer is connected with two ends of the protection module, two ends of a secondary side coil of the isolation transformer are connected to the rectification filter circuit, the voltage stabilizing circuit is arranged at the output end of the rectification filter circuit, and the output end of the rectification filter circuit is connected with the input end of the voltage stabilizing circuit.
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|---|---|---|---|---|
| CN112816863A (en) * | 2021-02-05 | 2021-05-18 | 珠海博威电气股份有限公司 | Capacitor power-taking switch with fault diagnosis function and method |
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2021
- 2021-02-05 CN CN202120350375.6U patent/CN214953952U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112816863A (en) * | 2021-02-05 | 2021-05-18 | 珠海博威电气股份有限公司 | Capacitor power-taking switch with fault diagnosis function and method |
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