CN217156774U - Cable maintenance grounding identification instrument - Google Patents
Cable maintenance grounding identification instrument Download PDFInfo
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- CN217156774U CN217156774U CN202122765889.0U CN202122765889U CN217156774U CN 217156774 U CN217156774 U CN 217156774U CN 202122765889 U CN202122765889 U CN 202122765889U CN 217156774 U CN217156774 U CN 217156774U
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Abstract
The utility model discloses a cable repair ground connection discernment appearance, including AC power supply, DC power supply, current detection module, current type mutual-inductor, voltage type mutual-inductor, the relay, first signal lamp and second signal lamp, voltage type mutual-inductor electric connection is to AC power supply's output, current type mutual-inductor electric connection is to current detection module's signal input part, the one end of first signal lamp and the one end of second signal lamp are connected to a normally closed contact and a normally open contact of relay respectively, DC power supply is connected to the other end of first signal lamp and second signal lamp, the control end of relay is connected to an output of current detection module in order to control the bright of first signal lamp and second signal lamp according to the size of detection current and go out, DC power supply connects this current detection module in order to supply power for this current detection module. It has the following advantages: whether detection that unit ground connection switch was closed a floodgate is presented out to the realization looped netowrk cabinet, and the testing result is reliable, and recognizer simple structure, convenient operation.
Description
Technical Field
The utility model relates to a cable repair ground connection discernment appearance.
Background
Along with the improvement of electrical technology and the construction and upgrading of urban power distribution networks, the requirement on power utilization safety is greatly improved, and SF is used on a large scale in the construction of urban 10kV power supply distribution networks 6 An inflatable all-insulated outdoor ring main unit is characterized by safety and reliability and adopts an all-insulated all-sealed design. Sealing the breaker, the grounding knife switch, the bus and the like in a state of being filled with SF 6 In a gas chamber, a 10kV cable feed-out terminal adopts a full-insulation plug-in T-shaped cable head. Under the condition that the equipment shell is reliably protected and groundedAnd the shell of the equipment and the cable terminal are both touchable, and the safety level is very high.
SF 6 The safety of the inflatable all-insulated outdoor ring main unit has great advantages in operation. However, because the equipment is designed in a fully-sealed mode, the positions of the circuit breaker and the grounding disconnecting link cannot be visually observed, and no part capable of directly testing electricity exists. Whether or not power failure occurs is determined only by means of a mechanical interlock indication change, a charged display device, an instrument, and the like.
For example, by comparing SF 6 904 and 906 units of the inflatable all-insulation outdoor ring main unit judge 904 that the grounding disconnecting link is switched on through mechanical linkage indication change and an electrified display device, and the line side is dead, so that the maintenance can be realized; and when the 906 circuit breaker is switched on, the line side is electrified, so that the electric danger exists.
The judgment is carried out by adopting an indirect method, the judgment result is possible to have errors, and the maintenance working site constructor has certain potential safety hazard.
Since the device is fully sealed, a technical means is required for determination. And when the power failure maintenance work is carried out, whether the grounding knife switch is in a closing state or not is judged. In order to solve the problems, the grounding identification instrument for cable maintenance is specially designed.
In summary, SF is now commonly used 6 The inflatable all-insulated outdoor ring main unit is a fully-sealed and all-insulated device, and a cable feed-out terminal of the inflatable all-insulated outdoor ring main unit is an all-insulated plug-in T-shaped cable head. The positions of the circuit breaker and the grounding knife switch can not be visually observed, and no part capable of directly testing electricity is provided.
As shown in FIG. 1, SF 6 A single feeding-out unit A \ B \ C three-phase electrical schematic diagram of the inflatable all-insulated cable outdoor ring main unit is adopted, when the 905 units feed out cables for maintenance, the safety measures for ensuring the maintenance work are that the circuit breaker 101 is opened and the grounding knife switch 102 is closed. Although the working position is shown in fig. 1, the 905 unit feed-out cable working position 103 cannot be directly tested, and whether the grounding knife switch 102 is closed or not cannot be directly observed.
At present, mechanical linkage indication change and an electrified display device are adopted to judge whether power failure occurs. If the mechanical linkage mechanism of the circuit breaker 101 and the grounding disconnecting link 102 is damaged, the actual condition cannot be correctly reflected, and if the sensor fails and the display lamp is damaged, whether the equipment is electrified or not cannot be correctly reflected by the electrified display device. Therefore, the indirect judgment method cannot provide certainty for the work safety of field workers.
SUMMERY OF THE UTILITY MODEL
The utility model provides a cable repair ground connection discernment appearance, it has overcome in the background art the not enough of prior art.
The utility model provides a technical scheme that its technical problem adopted is:
the cable maintenance grounding identification instrument comprises an alternating current power supply for providing alternating current, a direct current power supply for providing low-voltage direct current, a current detection module for collecting and judging the magnitude of current, a current type mutual inductor, a voltage type mutual inductor, a relay, a first signal lamp and a second signal lamp which have different display colors, the voltage-type mutual inductor is electrically connected to the output end of the alternating current power supply, the current-type mutual inductor is electrically connected to the signal input end of the current detection module, one end of the first signal lamp and one end of the second signal lamp are respectively connected to a normally closed contact and a normally open contact of the relay, the other end of the first signal lamp and the other end of the second signal lamp are connected with a direct current power supply, an output end of the current detection module is connected with a control end of the relay to control the on and off of the first signal lamp and the second signal lamp according to the size of the detection current, and the direct current power supply is connected with the current detection module to supply power for the current detection module.
In one embodiment: the alternating current power supply comprises a DC/AC inversion module and a direct current power supply, wherein the input end of the DC/AC inversion module is connected with the output end of the direct current power supply, and the output end of the DC/AC inversion module is connected with the voltage type mutual inductor.
In one embodiment: the DC/AC inverter comprises a DC power supply, a DC/AC inverter module, a power supply indicator lamp and a power supply switch, wherein the power supply switch is connected between the DC power supply and the DC/AC inverter module, and two ends of the power supply indicator lamp are connected to two ends of the DC power supply between the power supply switch and the DC/AC inverter module in parallel.
In one embodiment: the current detection module is an intelligent detection module with a microcontroller.
In one embodiment: the current detection module comprises a display unit, and the display unit is connected with the microcontroller.
In one embodiment: the DC power supply is a rechargeable lithium battery and outputs 12V DC voltage.
In one embodiment: the voltage type mutual inductor is a handheld pincerlike voltage type mutual inductor, and the current type mutual inductor is a handheld pincerlike current type mutual inductor.
In one embodiment: the power indicator light is a yellow light, the first signal light is a red light, and the second signal light is a green light.
In one embodiment: still include a casing, this DC power supply, alternating current power supply, current detection module, relay, first signal lamp, second signal lamp are all installed on this casing.
In one embodiment: the shell is provided with a USB charging socket, a first electric socket and a second electric socket, the USB charging socket is connected with a direct-current power supply, the first electric socket is connected with the output end of an alternating-current power supply, and the second electric socket is connected with the signal input end of the current detection module.
Compared with the background technology, the technical scheme has the following advantages:
the cable maintenance grounding identification instrument is simple and portable in structure, convenient to operate in practical use and mainly applied to on-site cable maintenance; can directly judge SF technically 6 Whether the outdoor looped netowrk cabinet of inflatable all-insulated cable is presented out unit ground connection switch and is closed a floodgate, and then judges whether cable T type cable head is by the short circuit, provides the foundation of "safe construction" from the technology, has overcome the current uncertainty of carrying out ground connection judgement through ground connection switch combined floodgate instruction etc. has ensured the safety of cable maintenance work.
Drawings
The present invention will be further explained with reference to the drawings and examples.
FIG. 1 shows SF in the background art 6 Inflatable all-insulated cable middling pressure looped netowrk cabinet 905 unit electrical wiring schematic diagram.
Fig. 2 is a schematic structural diagram of a cable maintenance grounding identification instrument.
Fig. 3 is one of the detection schematic diagrams of the cable repair grounding identification instrument.
Fig. 4 is a second detection schematic diagram of the cable inspection grounding identification instrument.
Fig. 5 is a third detection schematic diagram of the cable maintenance grounding identification instrument.
Detailed Description
Referring to fig. 2, the cable repair ground identifier includes an ac power supply for supplying ac power, a dc power supply 10 for supplying low-voltage dc power, a current detection module 20 for collecting and determining the magnitude of current, a current transformer 30, a voltage transformer 40, a relay 50, a first signal lamp 60 and a second signal lamp 70 with different colors, the voltage transformer 40 is electrically connected to the output end of the ac power supply, the current transformer 30 is electrically connected to the signal input end of the current detection module 20, one end of the first signal lamp 60 and one end of the second signal lamp 70 are respectively connected to a normally closed contact and a normally open contact of the relay 50, the other ends of the first signal lamp 60 and the second signal lamp 70 are connected to the dc power supply 10, one output end of the current detection module 20 is connected to the control end of the relay 50 to control the first signal lamp 60 and the second signal lamp 70 to be turned off according to the magnitude of the detected current, the dc power supply 10 is connected to the current detection module 20 to supply power to the current detection module 20.
The AC power supply includes a DC/AC inverter module 80 and a DC power supply 10, the input terminal of the DC/AC inverter module 80 is connected to the output terminal of the DC power supply 10, i.e. the AC power supply is inverted by the DC power supply 10, and the output terminal of the DC/AC inverter module 80 is connected to the voltage transformer 40.
The direct current power supply 10 is a lithium battery with USB charging, 12V direct current voltage is output, the capacity is 2000mAH, the charging is convenient, and the cruising ability is long. The inversion of the AC power supply outputs 110V AC, pure sine wave, rated power of 300W, and the AC power supply has high temperature protection and short circuit protection.
The power supply comprises a power supply indicator lamp 91 and a power supply switch 92, wherein the power supply switch 92 is connected between the direct current power supply 10 and the DC/AC inverter module 80, and two ends of the power supply indicator lamp 91 are connected in parallel with two ends of the direct current power supply 10 between the power supply switch 92 and the DC/AC inverter module 80. The power switch 92 is a push button switch.
In this embodiment, the power indicator 91 is a yellow light, the first signal light 60 is a red light, and the second signal light 70 is a green light. The power indicator 91, the first signal lamp 60 and the second signal lamp 70 are direct current 12V LED signal lamps, and have the characteristics of long service life, electricity saving and the like.
The current detection module 20 is an intelligent detection module with a microcontroller. The current detection module 20 comprises a display unit 21, and the display unit 21 is connected with the microcontroller. The power supply voltage of the current detection module 20 is direct current 12V, the detection alternating current range is 0-5A, the detection precision is 15mA, and the relay on-off capacity is 5A. The current action value can be set, when the detected current reaches the set value, the relay 50 can be triggered to act, and the corresponding signal lamp is turned on or off.
The voltage type transformer 40 is a handheld pincerlike voltage type transformer, 2 outgoing lines of the voltage type transformer are BVR-2.5 square meters of copper-plastic wires, and the length of each wire is 500 mm. The current type mutual inductor 30 is a handheld pincerlike current type mutual inductor which is a high-precision sensor, the clamp measuring range is 0.5mA-20A, 2 outgoing lines are BVR-2.5 square meter copper plastic wires, and the length of each wire is 500 mm.
The direct current power supply 10, the alternating current power supply, the current detection module 20, the relay 50, the first signal lamp 60 and the second signal lamp 70 are all mounted on the housing 200. The casing 200 is provided with a USB charging socket 201, a first electrical socket 202 and a second electrical socket 203, the USB charging socket 201 is connected to the dc power supply 10, the first electrical socket 202 is connected to the output terminal of the ac power supply, and the second electrical socket 203 is connected to the signal input terminal of the current detection module 20. The housing 200 is made of a high strength acrylic plate.
The grounding identification principle of the cable maintenance grounding identification instrument is as follows: as shown in fig. 3, the voltage transformer 40 and the current transformer 30 are respectively clamped on a conductive loop 300 which can be conducted. Turning on the power switch 92, the power indicator 91 (yellow light) is on, the first signal lamp 60 (red light) is on, and the second signal lamp 70 (green light) is off; the DC/AC inverter module 80 starts to work, an alternating voltage is output through the voltage type transformer 40, a secondary side coil of the voltage type transformer 40 generates a current I1, a current I2 is induced in the conductive loop 300, because a current I2 exists, a current I3 is induced on a secondary side of the current type transformer 30, the current I3 is collected by the current detection module 20, and the I3 is compared with the set current action value, when the current I3 exceeds the set current action value, the current detection module 20 outputs a control signal to control the relay 50 to act, so that the first signal lamp 60 (red lamp) is turned off, and the second signal lamp 70 (green lamp) is turned on. The voltage source transformer 40 and the current source transformer 30 are shown clamped to a conductive loop 300.
As shown in fig. 4, the voltage transformer 40 and the current transformer 30 are respectively clamped on the SF by the calipers 6 The cable head lead of the A-phase cable T-shaped of the inflatable outdoor ring main unit 1. If SF 6 The grounding knife switches of the inflatable outdoor ring main units 1 and 2 are in a closing state, SF 6 The ABC three-phase cables of the inflatable outdoor ring main units 1 and 2 pass through the grounding switch and then form a conductive loop 300 through the connecting cable 301 (existing in the ring main unit), and an equivalent loop is shown in fig. 5. When the power switch 92 is turned on, the red light is turned off and the green light is turned on, indicating SF 6 The grounding knife-switch of the inflatable outdoor ring main unit 1 and 2 is in a closing state, and SF 6 No power is fed out from the cables fed out by the units of the inflatable outdoor ring main unit 1, so that safe construction can be realized.
If the green light is off and the red light is on, then SF is indicated 6 The inflatable outdoor ring main units 1 and 2 have at least one grounding knife switch which is not in a closing state or damaged, so that the cable cannot be determined to be safely constructed, and constructors are reminded to stop construction.
The cable maintenance ground connection identification instrument directly detects and judges whether the ring main unit is grounded from the angle of the electric line, and compared with the prior art, the ground connection identification instrument is more direct, the identification result is more reliable, and the safety of constructors can be guaranteed.
The above description is only a preferred embodiment of the present invention, and therefore the scope of the present invention should not be limited by this description, and all equivalent changes and modifications made within the scope and the specification of the present invention should be covered by the present invention.
Claims (10)
1. Cable maintenance ground connection discernment appearance, its characterized in that: comprises an alternating current power supply for providing alternating current, a direct current power supply for providing low-voltage direct current, a current detection module for collecting and judging the magnitude of current, a current type mutual inductor, a voltage type mutual inductor, a relay, a first signal lamp and a second signal lamp which have different display colors, the voltage-type mutual inductor is electrically connected to the output end of the alternating current power supply, the current-type mutual inductor is electrically connected to the signal input end of the current detection module, one end of the first signal lamp and one end of the second signal lamp are respectively connected with a normally closed contact and a normally open contact of the relay, the other end of the first signal lamp and the other end of the second signal lamp are connected with a direct current power supply, an output end of the current detection module is connected with a control end of the relay to control the on and off of the first signal lamp and the second signal lamp according to the size of the detection current, and the direct current power supply is connected with the current detection module to supply power for the current detection module.
2. The cable repair grounding identifier of claim 1, wherein: the alternating current power supply comprises a DC/AC inversion module and a direct current power supply, wherein the input end of the DC/AC inversion module is connected with the output end of the direct current power supply, and the output end of the DC/AC inversion module is connected with the voltage type mutual inductor.
3. The cable repair grounding identifier of claim 2, wherein: the DC/AC inverter comprises a DC power supply, a DC/AC inverter module, a power supply indicator lamp and a power supply switch, wherein the power supply switch is connected between the DC power supply and the DC/AC inverter module, and two ends of the power supply indicator lamp are connected to two ends of the DC power supply between the power supply switch and the DC/AC inverter module in parallel.
4. The cable repair grounding identifier of claim 1, wherein: the current detection module is an intelligent detection module with a microcontroller.
5. The cable repair grounding identifier of claim 4, wherein: the current detection module comprises a display unit, and the display unit is connected with the microcontroller.
6. The cable repair grounding identifier of claim 2, wherein: the DC power supply is a rechargeable lithium battery and outputs 12V DC voltage.
7. The cable repair grounding identifier of claim 1, wherein: the voltage type mutual inductor is a handheld pincerlike voltage type mutual inductor, and the current type mutual inductor is a handheld pincerlike current type mutual inductor.
8. The cable repair grounding identifier of claim 3, wherein: the power indicator light is a yellow light, the first signal light is a red light, and the second signal light is a green light.
9. The cable service grounding identifier of any one of claims 1 to 8, wherein: still include a casing, this DC power supply, alternating current power supply, current detection module, relay, first signal lamp, second signal lamp are all installed on this casing.
10. The cable repair grounding identifier of claim 9, wherein: the shell is provided with a USB charging socket, a first electric socket and a second electric socket, the USB charging socket is connected with a direct-current power supply, the first electric socket is connected with the output end of an alternating-current power supply, and the second electric socket is connected with the signal input end of the current detection module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122765889.0U CN217156774U (en) | 2021-11-09 | 2021-11-09 | Cable maintenance grounding identification instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122765889.0U CN217156774U (en) | 2021-11-09 | 2021-11-09 | Cable maintenance grounding identification instrument |
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| Publication Number | Publication Date |
|---|---|
| CN217156774U true CN217156774U (en) | 2022-08-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122765889.0U Active CN217156774U (en) | 2021-11-09 | 2021-11-09 | Cable maintenance grounding identification instrument |
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| CN (1) | CN217156774U (en) |
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2021
- 2021-11-09 CN CN202122765889.0U patent/CN217156774U/en active Active
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