CN211603464U - Single CT charges and drop switch monitor terminal of sampling - Google Patents

Abstract

The utility model discloses a single CT charges and drop switch monitor terminal of sampling. The terminal comprises a shell fixed on the outer side of the fuse, wherein a state detection unit, a processor, a wireless communication module, a power supply module and a current transformer are arranged in the shell. The utility model discloses the realization adopts a current transformer to compromise current sampling and the function of charging, make the size of product less, and adopt two kinds of power supply modes of rechargeable battery and reserve battery, make power supply and job stabilization nature provide, through detecting with the switch, three kinds of detection modes of angle detection and current detection, improve the accuracy of judgement, still regularly awaken up the treater initiative through the clock chip and detect, avoid the unusual unable normal monitoring of switch detecting element, also can detect the result with the angle detection through contrast switch during the initiative detection, judge whether switch detecting element and angle detecting element are unusual, the accuracy of fuse monitoring has been improved by a wide margin, and the live time of battery can be prolonged.

Description

Single CT charges and drop switch monitor terminal of sampling

Technical Field

The invention relates to the field of power monitoring equipment, in particular to a single-CT charging and sampling drop switch monitoring terminal.

Background

The drop-out fuse has the characteristics of economy, convenient operation, strong adaptability to outdoor environment and the like, is widely applied to 10kV distribution lines and distribution transformers, and is used as a component for protecting and carrying out equipment throwing and cutting operations. Because the drop-out fuse is not monitored in the prior art, when the drop-out fuse is fused due to overcurrent, a maintainer cannot know that the fuse breaks down in time, so that the maintainer cannot process the fault in time, and a relevant area is powered off for a long time.

In recent years, some drop-out fuse monitoring means have appeared, such as the following application numbers: 201620582342.3 discloses a passive auxiliary monitoring system for position signals of a drop-out fuse, which adopts a ball switch or a mercury switch to judge whether the drop-out fuse falls or not, and then outputs signals in a wired mode through a passive contact signal output module. And as disclosed in the invention patent application with application number 201410256187.1, the intelligent drop-out fuse is triggered to wake up a single chip computer when a gravity sensing detection circuit detects that the drop-out fuse falls off, and the working mode has low reliability. Specifically, when the gravity sensing detection circuit fails, a drop event cannot be sensed when the drop fuse falls, or the drop event information cannot be sent out, so that the drop fuse cannot be normally monitored.

The drop-out fuse is an ideal state when a fuse wire is fused, but when the drop-out fuse is used in reality, the drop-out fuse cannot fall normally when the fuse wire is fused due to the fact that the rotating resistance of a rotating shaft is large caused by the fact that the drop-out fuse is not installed correctly, sundries are blocked or the environment is bad, and under the condition, the drop-out fuse cannot be detected to be in a fused and non-falling state currently only through means such as switch detection and angle detection, and maintainers cannot know that the fuse wire fails in time, so that the failure cannot be handled in time, and long-time power failure of relevant areas is caused.

In addition, when the existing power terminal needs to be charged and current is sampled, two current transformers are generally adopted to respectively carry out charging and sampling work, the terminal needs to be installed on a drop-out fuse, and the two current transformers are adopted to enable the product to be large and not beneficial to use.

Disclosure of Invention

The invention aims to provide a single-CT charging and sampling drop switch monitoring terminal aiming at the defects in the prior art.

In order to achieve the above object, the present invention provides a single CT charging and sampling drop switch monitoring terminal, which includes a housing fixed outside a fuse, a state detection unit, a processor D4, a wireless communication module, a power module and a current transformer are arranged in the housing, the state detection unit is connected to the processor D4 for detecting the position state of the drop fuse, the current transformer and the processor D4 are respectively connected to a first switch chip D2, the power module includes a charging circuit and a rechargeable battery connected to the charging circuit, the first switch chip D2 is respectively connected to the current sampling circuit and the charging circuit, the processor D4 controls the current transformer to be connected to the current sampling circuit or the charging circuit through the first switch chip D2 to perform current sampling or charge the rechargeable battery, the processor D4 is connected to the wireless communication module, and the wireless communication module is controlled to send the collected position state information and current data of the drop-out fuse.

Further, power module still includes the spare battery, rechargeable battery and spare battery are connected with second switch chip D3 respectively, second switch chip D3 obtains operating voltage from the spare battery, be connected with electric quantity feedback circuit between treater D4 and the rechargeable battery, work as rechargeable battery's electric quantity is higher than when setting for the threshold value, the treater passes through second switch chip D3 control rechargeable battery and supplies power to the terminal, work as rechargeable battery's electric quantity is less than when setting for the threshold value, treater D4 passes through second switch chip D3 control spare battery and supplies power to the terminal.

Further, the state detection unit comprises a switch detection unit connected with the processor D4.

Further, when the switch detection unit does not detect that the drop-out fuse falls, the processor D4 runs in a sleep state, the switch detection unit wakes up the processor D4 when detecting that the drop-out fuse falls, the processor D4 and the standby battery are further connected with the clock chip D5, the clock chip D5 wakes up the processor D4 at a set time interval, the state detection unit further comprises an angle detection unit, the processor D4 controls the angle detection unit and the first switch chip D2 to work in a wake-up state, and controls the wireless communication module to send out position state information and current data of the drop-out fuse.

Further, the current sampling circuit comprises a resistor R15 and a resistor R16, one ends of the resistor R15 and the resistor R16 are respectively connected with two ends of the current transformer, a resistor R18 is connected between the other ends of the resistor R15 and the resistor R16, the other end of the resistor R15 is connected with one end of a resistor R21, and the other ends of the resistor R21 and the resistor R16 are respectively connected with a processor D4.

Furthermore, a capacitor C27 is connected in parallel with the resistor R18, and a capacitor C29 is connected between the resistor R21 and the other end of the resistor R16.

Further, the switch detection unit includes a position switch Q4, one end of the position switch Q4 is connected to the positive electrode of the power supply module through a resistor R46, and the other end thereof is connected to the processor D4, and the position switch Q4 includes a mercury switch or a ball switch.

Further, the angle detection unit includes an angle sensor D1 connected to the processor D4 and a power control circuit connected between the angle sensor D1 and the processor D4.

Further, the power control circuit comprises a triode VT1 of which the emitting electrode is connected with the processor D4, the base electrode of the triode VT1 is connected with the processor D4 through a resistor R11, and the collector electrode of the triode VT1 is connected with the angle sensor D1 through a resistor R13 and a resistor R5 in sequence.

Furthermore, a capacitor C18 is connected between the angle sensor D1 and the resistor R5, the other end of the capacitor C18 is grounded, a capacitor C24 is connected between the emitter of the triode VT1 and the ground, and a capacitor C23 is connected between the collector of the triode VT1 and the ground.

Has the advantages that: 1. the invention adopts one current transformer, and the current transformer is switched to be communicated with the current sampling circuit or the charging circuit through the first switch chip, so that the current sampling and the charging of the rechargeable battery can be switched, and compared with the conventional two current transformers, the size of the product can be reduced;

2. two power supply modes of a rechargeable battery and a standby battery are adopted, so that the power supply and working stability can be improved, and the replacement time of the battery is prolonged;

3. the fuse protector is fixed on the drop-out fuse, when the fuse protector is fused and falls off, the state detection unit can detect a fall-off event, and when the fuse protector is fused but fails to fall off normally, the state detection unit can detect the fall-off event through data collected by the current collection unit;

4. the processor has two working modes of a dormant state and an awakening state, so that the electric quantity is saved;

5. the accuracy of fuse state judgment is improved through three detection modes, namely switch detection, angle detection and current detection;

6. the clock chip regularly awakens the treater up and carries out the initiative detection to the fuse to avoid the switch detecting element to cause unusually can't detect the fuse and fall, also can judge whether unusual switch detecting element, angle detecting element and current sampling through the result of contrast switch detection, angle detection and current detection during the initiative detection.

Drawings

Fig. 1 is a schematic block diagram of a single CT charging and sampling drop switch monitoring terminal according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a first switch chip according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a second switch chip according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of an exemplary embodiment of a power feedback circuit;

FIG. 5 is a schematic diagram of a current sampling circuit according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of an angle detection unit according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a switch detection unit according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a clock chip according to an embodiment of the present invention;

FIG. 9 is a block diagram of a processor according to an embodiment of the invention;

fig. 10 is a schematic structural diagram of a charging circuit according to an embodiment of the present invention.

Detailed Description

The present invention will be further illustrated with reference to the accompanying drawings and specific examples, which are carried out on the premise of the technical solution of the present invention, and it should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention.

As shown in fig. 1 to 10, an embodiment of the present invention provides a single CT charging and sampling drop switch monitoring terminal, which includes a housing fixed outside a fuse, and the housing is preferably a waterproof insulating housing. The state detection unit 1, the processor D4, the wireless communication module 2, the power module 3, the current transformer 4 and the like are arranged in the shell, wherein the processor D4 preferably adopts a single chip microcomputer, the state detection unit 1 is connected with the processor D4 and used for detecting the position state of the drop-out fuse and sending the detected position state of the drop-out fuse to the processor D4 in the form of an electric signal, and the current transformer 4 is arranged in the shell in a sleeved mode on the periphery of the drop-out fuse and can further collect current signals passing through the drop-out fuse.

The current transformer 4 and the processor D4 are respectively connected with the first switch chip D2, and the power module 3 includes a charging circuit 5 and a rechargeable battery 6. The charging circuit 5 is connected with the charging battery 6, the charging circuit 5 comprises a bridge rectifier circuit consisting of a diode VD1, a diode VD2, a diode VD3 and a diode VD4, the bridge rectifier circuit is connected with a charging chip D7 and the like, and the first switch chip D2 is respectively connected with the current sampling circuit 7 and the charging circuit 5. The processor D4 controls the first switch chip D2 to switch on the current transformer 4 and the current sampling circuit 7 only when current sampling is required, otherwise, the processor D4 controls the first switch chip D2 to switch on the current transformer 4 and the charging circuit 5 to charge the rechargeable battery 6. The processor D4 is connected to the wireless communication module 2 to control the wireless communication module 2 to send out the collected position state information and current data of the drop-out fuse.

In a time period with less power consumption, when the current passing through the fuse is small, the current obtained by the current transformer 4 may not be enough to meet the charging requirement, and at this time, the rechargeable battery 6 may have power loss and cannot normally supply power to the terminal, so the power module of the embodiment of the present invention further includes the backup battery 8, the rechargeable battery 6 and the backup battery 8 are respectively connected to the second switch chip D3, and the second switch chip D3 obtains the working voltage from the backup battery 8, thereby ensuring that the battery switching operation is normally performed. And a power feedback circuit 9 is connected between the processor D4 and the rechargeable battery 6 to collect and monitor the power of the rechargeable battery 6. When the charge of the rechargeable battery 6 is higher than the set threshold, the processor D4 controls the rechargeable battery 6 to supply power to the terminal through the second switch chip D3, and when the charge of the rechargeable battery 6 is lower than the set threshold, the processor D4 controls the backup battery 8 to supply power to the terminal through the second switch chip D3. In order to adapt to various temperature environments, the standby battery 8 can adopt a high-low voltage battery, preferably a high-low temperature battery with the voltage of 3.6V and the capacity of more than or equal to 1200mAh, and can directly supply power to the terminal without arranging a voltage reduction circuit.

The state detection unit 1 of the embodiment of the present invention includes a switch detection unit 11 connected to the processor D4. In order to save the power of the rechargeable battery 6 and the backup battery 8, the processor D4 preferably has two operation modes, i.e., a sleep mode and an awake mode, and the processor D4 operates in the sleep mode when the drop-out fuse drop is not detected by the switch detection unit 11, thereby reducing the power consumption. The switch detection unit 11 wakes up the processor D4 when detecting that the drop-out fuse drops, the processor D4 is further connected with the clock chip D5, the clock chip 5 is further connected with the backup battery 8 to directly obtain the working voltage from the backup battery 8, and the clock chip D5 does not break down during power switching. The clock chip D5 wakes up the processor D4 at a set time interval, the state detection unit 1 further includes an angle detection unit 12, and the processor D4 controls the angle detection unit 12 and the first switch chip D2 to operate in the awake state to measure the angle and the current of the drop-out fuse, and controls the wireless communication module 2 to send out the position state information and the current data of the drop-out fuse. The processor D4 sends the drop-out fuse position state information and then enters the sleep state again until the switch detection unit 11 or the clock chip D5 wakes up the same again.

The current sampling circuit 7 of the embodiment of the invention comprises a resistor R15 and a resistor R16, wherein one ends of the resistor R15 and the resistor R16 are respectively connected with two ends of the current transformer 5, a resistor R18 is connected between the other ends of the resistor R15 and the resistor R16, the other end of the resistor R15 is connected with one end of the resistor R21, and the other ends of the resistor R21 and the resistor R16 are respectively connected with a processor D4. In order to improve the stability of the signal supplied to the processor D4, a capacitor C27 is connected in parallel to the resistor R18, and a capacitor C29 is connected between the resistor R21 and the other end of the resistor R16.

The switch detection unit of the embodiment of the invention comprises a position switch Q4, and the position switch Q4 can adopt a mercury switch or a ball switch. One end of the position switch Q4 is connected to the positive electrode of the power module 3 through a resistor R46, and the other end thereof is connected to the processor D4. When the drop-out fuse is blown down, the position switch Q4 is closed from the open state, thereby providing a high level signal to the processor D4.

The angle detection unit 12 of the embodiment of the present invention includes an angle sensor D1 connected to the processor D4, and a power control circuit connected between the angle sensor D1 and the processor D4. Specifically, the power control circuit comprises a triode VT1, an emitter of the triode VT1 is connected with the processor D4 to obtain working voltage, a base of the triode VT1 is connected with the processor D4 through a resistor R11, and a collector of the triode VT1 is connected with the angle sensor D1 through a resistor R13 and a resistor R5 in sequence. The processor D4 provides a low level signal to the base of the transistor VT1 in the sleep state, so that the emitter and the collector of the transistor VT1 are in the cut-off state, and the power supply of the angle sensor D1 is cut off, and the angle sensor D1 does not work. The processor D4 inputs high level to the base of the triode VT1 in the wake-up state, and triggers the triode VT1 to conduct, and the angle sensor D1 is powered on to work. Thereby avoiding wasting power by the angle sensor D1 when the processor D4 is in the sleep state.

In order to improve the stability of the power supply voltage of the angle sensor D1, a capacitor C18 is connected between the angle sensor D1 and the resistor R5, the other end of the capacitor C18 is grounded, a capacitor C24 is connected between the emitter of the transistor VT1 and the ground, and a capacitor C23 is connected between the collector of the transistor VT1 and the ground.

The wireless communication module 2 preferably adopted in the embodiment of the invention is a 2.4G wireless module or a low-power-consumption LoRa/FSK module, but is not limited to the above three modules, and can be selected according to the needs of customers.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that other parts not specifically described are within the prior art or common general knowledge to those of ordinary skill in the art. Without departing from the principle of the invention, several improvements and modifications can be made, and these improvements and modifications should also be construed as the scope of the invention.

Claims (10)

1. The single-CT charging and sampling drop switch monitoring terminal is characterized by comprising a shell fixed on the outer side of a fuse, wherein a state detection unit (1), a processor (D4), a wireless communication module (2), a power module (3) and a current transformer (4) are arranged in the shell, the state detection unit (1) is connected with the processor (D4) and used for detecting the position state of the drop fuse, the current transformer (4) and the processor (D4) are respectively connected with a first switch chip (D2), the power module (3) comprises a charging circuit (5) and a charging battery (6) connected with the charging circuit (5), the first switch chip (D2) is respectively connected with the current sampling circuit (7) and the charging circuit (5), and the processor (D4) controls the current transformer (4) to be connected with the current sampling circuit (7) or the charging circuit (5) through a first switch chip (D2), the processor (D4) is connected with the wireless communication module (2) to control the wireless communication module (2) to send out the collected position state information and current data of the drop-out fuse.

2. The single-CT charging and sampling drop switch monitoring terminal according to claim 1, wherein the power module further comprises a backup battery (8), the rechargeable battery (6) and the backup battery (8) are respectively connected to a second switch chip (D3), the second switch chip (D3) obtains an operating voltage from the backup battery (8), a power feedback circuit (9) is connected between the processor (D4) and the rechargeable battery (6), when the power of the rechargeable battery (6) is higher than a set threshold, the processor (D4) controls the rechargeable battery (6) to supply power to the terminal through the second switch chip (D3), and when the power of the rechargeable battery (6) is lower than the set threshold, the processor (D4) controls the backup battery (8) to supply power to the terminal through the second switch chip (D3).

3. The single CT charging and sampling drop switch monitoring terminal according to claim 2, characterized in that said status detection unit (1) comprises a switch detection unit (11) connected to a processor (D4).

4. The single CT charging and sampling drop switch monitoring terminal of claim 3, the processor (D4) operates in a sleep state when the switch detection unit (11) does not detect the falling of the drop-out fuse, the switch detection unit (11) wakes up the processor (D4) when detecting that the drop-out fuse is dropped, the processor (D4) and the backup battery (8) are also connected with a clock chip (D5), the clock chip (D5) wakes up the processor (D4) at set time intervals, the state detection unit (1) further comprises an angle detection unit (12), the processor (D4) controls the angle detection unit (12) and the first switch chip (D2) to work in the wake-up state, and the wireless communication module (2) is controlled to send out the position state information and the current data of the drop-out fuse.

5. The single-CT charging and sampling drop switch monitoring terminal according to claim 1, wherein the current sampling circuit (7) comprises a resistor R15 and a resistor R16, one end of the resistor R15 and one end of the resistor R16 are respectively connected with two ends of the current transformer (4), a resistor R18 is connected between the other ends of the resistor R15 and the resistor R16, the other end of the resistor R15 is connected with one end of a resistor R21, and the other ends of the resistor R21 and the resistor R16 are respectively connected with the processor (D4).

6. The single-CT charging and sampling drop switch monitoring terminal according to claim 5, wherein the resistor R18 is connected in parallel with a capacitor C27, and a capacitor C29 is connected between the resistor R21 and the other end of the resistor R16.

7. The single-CT charging and sampling drop switch monitoring terminal according to claim 3, wherein the switch detection unit comprises a position switch Q4, one end of the position switch Q4 is connected to the positive pole of the power module (3) through a resistor R46, and the other end thereof is connected to the processor (D4), and the position switch Q4 comprises a mercury switch or a ball switch.

8. The single-CT charging and sampling drop switch monitoring terminal according to claim 4, characterized in that the angle detection unit (12) comprises an angle sensor D1 connected with the processor (D4) and a power control circuit connected between the angle sensor D1 and the processor (D4).

9. The single-CT charging and sampling droop switch monitor terminal according to claim 8, wherein said power control circuit comprises a transistor VT1 having an emitter connected to said processor (D4), wherein a base of said transistor VT1 is connected to said processor (D4) via a resistor R11, and wherein a collector of said transistor VT1 is connected to said angle sensor (D1) via a resistor R13 and a resistor R5 in sequence.

10. The single-CT charging and sampling drop switch monitoring terminal according to claim 9, wherein a capacitor C18 is further connected between the angle sensor D1 and the resistor R5, the other end of the capacitor C18 is grounded, a capacitor C24 is connected between the emitter of the transistor VT1 and ground, and a capacitor C23 is further connected between the collector of the transistor VT1 and ground.

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