CN217238214U - Insulation resistance on-line monitoring early warning system - Google Patents
Insulation resistance on-line monitoring early warning system Download PDFInfo
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- CN217238214U CN217238214U CN202220657609.6U CN202220657609U CN217238214U CN 217238214 U CN217238214 U CN 217238214U CN 202220657609 U CN202220657609 U CN 202220657609U CN 217238214 U CN217238214 U CN 217238214U
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Abstract
The utility model relates to the technical field of detection equipment, and provides an insulation resistance on-line monitoring and early warning system, which comprises an insulation resistance detector, wherein the insulation resistance detector is in communication connection with a server, the insulation resistance detector comprises a line terminal L, a grounding terminal E and a shielding terminal G, and the insulation resistance detector also comprises a switching control circuit, the switching control circuit comprises a battery B1 and a multi-way selector switch SW, the multi-way selector switch SW comprises a public end, a free end and a plurality of selection ends, the public end of the multi-way selector switch SW is connected with the anode of the battery B1, the free end of the multi-way selector switch SW is arranged in a suspension way, the plurality of selection ends of the multi-way selector switch SW are respectively connected with a plurality of branches, the branch connected with any one of the selection ends comprises a relay K1, one end of a coil of a relay K1 is connected with one selection end of the multi-way selection switch SW, and the other end of the coil of the relay K1 is connected with the negative electrode of the battery B1. Through above-mentioned technical scheme, the problem of insulation resistance detector complex operation, inefficiency among the prior art has been solved.
Description
Technical Field
The utility model relates to a check out test set technical field, it is concrete, relate to insulation resistance on-line monitoring early warning system.
Background
The insulation resistance test can sensitively reflect the insulation condition of the tested equipment, effectively find the defects of local or whole equipment wetting and dirt, insulation damage, serious overheating and aging and the like, and is an important index in the safety test of electrical equipment. Fig. 1 is a schematic diagram of an insulation resistance tester. The line terminal L, the wiring terminal E and the shielding terminal G of the insulation resistance tester are respectively connected with corresponding terminals of equipment to be tested, the high-voltage direct-current source is added between the wiring terminal E and the shielding terminal G, the resistor Rx is insulation resistance of the equipment to be tested, Rm is current-limiting resistor, and Rc is current sampling resistor. And obtaining a current signal flowing through the current Rx through the current sampling resistor, and obtaining a specific numerical value of the resistor Rx by combining voltage signals at two ends of the detection resistor Rx.
When the insulation resistance detector is used for testing the insulation resistance of a three-phase cable or a bus, a power supply of tested equipment is disconnected, all external connecting wires are removed or disconnected, the tested equipment is fully discharged, then the test is respectively carried out on each phase, when one phase is tested or measured, other two-phase conductors, metal shields or metal sleeves are grounded together, after each phase is tested, the tested equipment is discharged, and the process is sequentially repeated to finish the test. The operation process is complicated and the efficiency is low.
SUMMERY OF THE UTILITY MODEL
The utility model provides an insulation resistance on-line monitoring early warning system has solved insulation resistance detector complex operation, the problem of inefficiency among the correlation technique.
The technical scheme of the utility model as follows: the insulation resistance detector comprises an insulation resistance detector, the insulation resistance detector is in communication connection with a server, the insulation resistance detector comprises a line terminal L, a grounding terminal E and a shielding terminal G, and the insulation resistance detector further comprises a switching control circuit, the switching control circuit comprises a battery B1 and a multi-way selection switch SW, the multi-way selection switch SW comprises a public end, a free end and a plurality of selection ends, the public end of the multi-way selection switch SW is connected with the positive electrode of a battery B1, the free end of the multi-way selection switch SW is arranged in a suspension mode, the plurality of selection ends of the multi-way selection switch SW are respectively connected with a plurality of branches, the branch connected with any selection end comprises a relay K1, one end of a relay K1 coil is connected with one selection end of the multi-way selection switch SW, and the other end of the relay K1 coil is connected with the negative electrode of a battery B1,
the common end of the relay K1 contact is used for being connected with a device to be tested A, the normally closed end of the relay K1 contact is connected with the grounding terminal E, and the normally open end of the relay K1 contact is connected with the line terminal L.
Further, still include the direct current voltage acquisition circuit who is connected with the controller, the direct current voltage acquisition circuit is including the sampling circuit and the AD converting circuit who connect gradually, the sampling circuit is including resistance R1, resistance R2 and the resistance R3 of establishing ties, resistance R1's one end is connected with line terminal L, resistance R3's one end ground connection, the distant liftoff one end of resistance R3 is regarded as sampling circuit's output, inserts AD converting circuit, AD converting circuit's output inserts the controller.
Further, the AD conversion circuit comprises a conversion chip U6, the analog input end of the conversion chip U6 is connected with the output end of the sampling circuit, the reference voltage end of the conversion chip U6 is connected with the reference source circuit, the digital output end of the conversion chip U6 is connected with the controller,
the reference source circuit comprises a reference chip U5, the cathode of the reference chip U5 is grounded, the anode of the reference chip U5 is connected with a power supply VCC1 through a resistor R17, a capacitor C6 is connected between the anode and the cathode of the reference chip U5, and the reference pole of the reference chip U5 is connected with the reference voltage end of the conversion chip U6.
Further, an optical coupler U7 is further arranged between the AD conversion circuit and the controller, the input end of the optical coupler U7 is connected with the digital output end of the conversion chip U6, and the output end of the optical coupler U7 is connected with the controller.
The power supply circuit comprises a resistor R4 and a voltage regulator tube D1 which are connected in series, one end of the resistor R4 is connected with the line terminal L, the anode of the voltage regulator tube D1 is grounded, two ends of the voltage regulator tube D1 are connected with a capacitor C1, a capacitor C2 and a capacitor C3 in parallel, and the cathode of the voltage regulator tube D1 serves as the power supply VCC 1.
Further, an operational amplifier U1C is further arranged between the sampling circuit and the AD conversion circuit, the non-inverting input end of the operational amplifier U1C is connected with the output end of the sampling circuit, the output end of the operational amplifier U1C is connected to the inverting input end in a feedback mode, and the output end of the operational amplifier U1C is connected to the analog input end of the conversion chip U6.
The utility model discloses a theory of operation and beneficial effect do:
the utility model discloses when initial state, the common port and the free end of multiplexer switch SW are connected, and relay K1 does not move, and relay K1's common port is connected with ground terminal E, and the equipment that awaits measuring fully discharges. When the common end of the switching selection switch SW is connected with one of the selection ends, the coil of the relay K1 is electrified, the relay K1 acts, the common end of the relay K1 is connected with the line terminal L, namely the phase A of the equipment to be tested is connected with the line terminal L, and the insulation resistance test of the phase A of the equipment to be tested is carried out. After the phase A test is finished, the common end of the switching selection switch SW is connected with the suspended end, the coil of the relay K1 is powered off, the common end of the relay K1 is connected with the grounding terminal E, and the equipment to be tested is fully discharged. And then, the common terminal of the switch selection switch SW is switched to be connected with other selection terminals, and the insulation resistance test of the B phase or the C phase is carried out.
The utility model discloses a switching control circuit realizes the switching of the circuit that awaits measuring, need not rewiring, easy operation, efficient. The detection value of the insulation resistance is uploaded to the server, and a manager can know the insulation resistance of the equipment to be detected at the server side.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of insulation resistance detection principle;
fig. 2 is a schematic diagram of a switching control circuit according to the present invention;
FIG. 3 is a schematic diagram of a middle sampling circuit according to the present invention;
fig. 4 is a schematic diagram of the AD conversion circuit of the present invention;
in the figure: 1 switching control circuit, 2 sampling circuit, 3AD converting circuit, 4 power supply circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive work, are related to the scope of the present invention.
As shown in fig. 2, the insulation resistance online monitoring and early warning system of this embodiment includes an insulation resistance detector, the insulation resistance detector is in communication connection with a server, the insulation resistance detector includes a line terminal L, a ground terminal E and a shielding terminal G, and further includes a switching control circuit, the switching control circuit includes a battery B1 and a multiplexer SW, the multiplexer SW includes a common terminal, a free terminal and a plurality of selection terminals, the common terminal of the multiplexer SW is connected with the positive terminal of a battery B1, the free terminal of the multiplexer SW is suspended, the plurality of selection terminals of the multiplexer SW are respectively connected with a plurality of branches, wherein the branch connected with any one of the selection terminals includes a relay K1, one end of a coil of the relay K1 is connected with one selection terminal of the multiplexer SW, the other end of the coil of the relay K1 is connected with the negative terminal of a battery B1,
the common end of the relay K1 contact is used for being connected with the equipment A to be tested, the normally closed end of the relay K1 contact is connected with the grounding terminal E, and the normally open end of the relay K1 contact is connected with the line terminal L.
In the initial state of the present embodiment, the common terminal of the multiplexer SW is connected to the suspended terminal, the relay K1 does not operate, the common terminal of the relay K1 is connected to the ground terminal E, and the device under test is fully discharged. When the common end of the switching selection switch SW is connected with one of the selection ends, the coil of the relay K1 is electrified, the relay K1 acts, the common end of the relay K1 is connected with the line terminal L, namely the phase A of the equipment to be tested is connected with the line terminal L, and the insulation resistance test of the phase A of the equipment to be tested is carried out. After the phase A test is finished, the common end of the switching selection switch SW is connected with the suspended end, the coil of the relay K1 is powered off, the common end of the relay K1 is connected with the grounding terminal E, and the equipment to be tested is fully discharged. And then, the common terminal of the switch selection switch SW is switched to be connected with other selection terminals, and the insulation resistance test of the B phase or the C phase is carried out.
The embodiment realizes the switching of the line to be tested through the switching control circuit without rewiring, and has simple operation and high efficiency. The detection value of the insulation resistance is uploaded to the server, and a manager can know the insulation resistance of the equipment to be detected at the server side.
Further, the direct current voltage sampling circuit is connected with the controller and comprises a sampling circuit and an AD conversion circuit which are connected in sequence, as shown in fig. 3, the sampling circuit comprises a resistor R1, a resistor R2 and a resistor R3 which are connected in series, one end of the resistor R1 is connected with a line terminal L, one end of the resistor R3 is grounded, one end of the resistor R3 away from the ground is used as an output end of the sampling circuit and is connected to the AD conversion circuit, and an output end of the AD conversion circuit is connected to the controller.
The voltage Udc at the two ends of the insulation resistor Rx is high voltage, the resistor R1, the resistor R2 and the resistor R3 form a series voltage division circuit which is used for dividing the voltage at the two ends of the insulation resistor Rx, the terminal voltage of the resistor R3 is in direct proportion to the voltage Udc at the two ends of the insulation resistor Rx, and the voltage Udc at the two ends of the insulation resistor Rx can be obtained by testing the terminal voltage of the resistor R3. The terminal voltage of the resistor R3 is converted into a digital signal through the AD conversion circuit and is input into the controller, so that the controller can know the resistance value of the equipment to be tested in real time.
The controller may be a controller model commonly used in the current market, and the specific model of the controller in this embodiment is TMS320F 2806.
Further, as shown in fig. 4, the AD conversion circuit includes a conversion chip U6, the analog input terminal VIN of the conversion chip U6 is connected to the output terminal of the sampling circuit, the reference voltage terminal REFIN of the conversion chip U6 is connected to the reference source circuit, the digital output terminal fOUT of the conversion chip U6 is connected to the controller,
the reference source circuit comprises a reference chip U5, a cathode CAT of the reference chip U5 is grounded, AN anode AN of the reference chip U5 is connected with a power supply VCC1 through a resistor R17, a capacitor C6 is connected between the anode and the cathode of the reference chip U5, and a reference pole REF of the reference chip U5 is connected with a reference voltage end of the conversion chip U6.
Further, as shown in fig. 4, an optical coupler U7 is further disposed between the AD conversion circuit and the controller, an input end of the optical coupler U7 is connected with a digital output end of the conversion chip U6, and an output end of the optical coupler U7 is connected with the controller.
The reference chip U5 provides accurate reference voltage for the conversion chip U6, and the accuracy of the AD conversion result is guaranteed. An optocoupler U7 is arranged between the AD conversion circuit and the controller, so that the sampling circuit is electrically isolated from the controller, interference signals are prevented from entering the controller, and the reliable work of the controller is ensured.
Further, the power supply circuit comprises a resistor R4 and a voltage regulator tube D1 which are connected in series, as shown in FIG. 3, one end of the resistor R4 is connected with a line terminal L, the anode of the voltage regulator tube D1 is grounded, two ends of the voltage regulator tube D1 are connected with a capacitor C1, a capacitor C2 and a capacitor C3 in parallel, and the cathode of the voltage regulator tube D1 is used as a power supply VCC 1.
After the voltage Udc at the two ends of the insulation resistor Rx is divided by the voltage stabilizing tube D1 and the resistor R4, the voltage at the two ends of the voltage stabilizing tube D1 is taken as a power supply VCC1, a reliable power supply is provided for the conversion chip U6, a power supply circuit does not need to be additionally arranged, and the circuit structure is simplified.
Further, as shown in fig. 4, an operational amplifier U1C is further disposed between the sampling circuit and the AD conversion circuit, a non-inverting input terminal of the operational amplifier U1C is connected to an output terminal of the sampling circuit, an output terminal of the operational amplifier U1C is connected to an inverting input terminal in a feedback manner, and an output terminal of the operational amplifier U1C is connected to an analog input terminal of the conversion chip U6.
The operational amplifier U1C is used as a voltage follower and is arranged between the sampling circuit and the AD conversion circuit, so that the impedance matching effect is achieved, and the signal loss is reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the present invention.
Claims (6)
1. Insulation resistance on-line monitoring early warning system, including the insulation resistance detector, insulation resistance detector and server communication connection, the insulation resistance detector includes line terminal L, ground terminal E and shielding terminal G, its characterized in that still includes switching control circuit (1), switching control circuit (1) includes battery B1 and multiplexer SW, multiplexer SW includes common terminal, free end and a plurality of selected end, multiplexer SW's common terminal with the anodal of battery B1 is connected, multiplexer SW's free end is unsettled to be set up, a plurality of selected ends of multiplexer SW connect a plurality of branches respectively, wherein the branch of being connected with arbitrary selected end includes relay K1, the one end of relay K1 coil with a selected end of multiplexer SW is connected, the other end of the coil of the relay K1 is connected with the negative electrode of the battery B1,
the common end of the relay K1 contact is used for being connected with a device A to be tested, the normally closed end of the relay K1 contact is connected with the grounding terminal E, and the normally open end of the relay K1 contact is connected with the line terminal L.
2. The insulation resistance online monitoring and early warning system according to claim 1, further comprising a dc voltage acquisition circuit connected to the controller, wherein the dc voltage acquisition circuit comprises a sampling circuit (2) and an AD conversion circuit (3) connected in sequence, the dc voltage acquisition circuit comprises a resistor R1, a resistor R2 and a resistor R3 connected in series, one end of the resistor R1 is connected to a line terminal L, one end of the resistor R3 is grounded, one end of the resistor R3 far away from the ground is used as an output end of the sampling circuit (2) and is connected to the AD conversion circuit (3), and an output end of the AD conversion circuit (3) is connected to the controller.
3. The insulation resistance on-line monitoring and early warning system according to claim 2, wherein the AD conversion circuit (3) comprises a conversion chip U6, the analog input terminal of the conversion chip U6 is connected with the output terminal of the sampling circuit (2), the reference voltage terminal of the conversion chip U6 is connected with a reference source circuit, the digital output terminal of the conversion chip U6 is connected with the controller,
the reference source circuit comprises a reference chip U5, the cathode of the reference chip U5 is grounded, the anode of the reference chip U5 is connected with a power supply VCC1 through a resistor R17, a capacitor C6 is connected between the anode and the cathode of the reference chip U5, and the reference pole of the reference chip U5 is connected with the reference voltage end of the conversion chip U6.
4. The insulation resistance on-line monitoring and early warning system according to claim 3, wherein an optical coupler U7 is further arranged between the AD conversion circuit (3) and the controller, an input end of the optical coupler U7 is connected with a digital output end of the conversion chip U6, and an output end of the optical coupler U7 is connected with the controller.
5. The insulation resistance online monitoring and early warning system according to claim 3, further comprising a power supply circuit (4), wherein the power supply circuit (4) comprises a resistor R4 and a voltage regulator tube D1 which are connected in series, one end of the resistor R4 is connected with the line terminal L, the anode of the voltage regulator tube D1 is grounded, two ends of the voltage regulator tube D1 are connected in parallel with a capacitor C1, a capacitor C2 and a capacitor C3, and the cathode of the voltage regulator tube D1 is used as the VCC 1.
6. The insulation resistance online monitoring and early warning system according to claim 3, wherein an operational amplifier U1C is further disposed between the sampling circuit (2) and the AD conversion circuit (3), a non-inverting input terminal of the operational amplifier U1C is connected to an output terminal of the sampling circuit (2), an output terminal of the operational amplifier U1C is connected to an inverting input terminal in a feedback manner, and an output terminal of the operational amplifier U1C is connected to an analog input terminal of the conversion chip U6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220657609.6U CN217238214U (en) | 2022-03-24 | 2022-03-24 | Insulation resistance on-line monitoring early warning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220657609.6U CN217238214U (en) | 2022-03-24 | 2022-03-24 | Insulation resistance on-line monitoring early warning system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217238214U true CN217238214U (en) | 2022-08-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220657609.6U Active CN217238214U (en) | 2022-03-24 | 2022-03-24 | Insulation resistance on-line monitoring early warning system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217238214U (en) |
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- 2022-03-24 CN CN202220657609.6U patent/CN217238214U/en active Active
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