CN210222113U - Circuit protection detection system of protector - Google Patents
Circuit protection detection system of protector Download PDFInfo
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- CN210222113U CN210222113U CN201921058153.6U CN201921058153U CN210222113U CN 210222113 U CN210222113 U CN 210222113U CN 201921058153 U CN201921058153 U CN 201921058153U CN 210222113 U CN210222113 U CN 210222113U
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Abstract
The utility model discloses a protector circuit protection detecting system, which comprises a programmable logic device, wherein the programmable logic device is connected with an A/D sampling circuit and an operation relay, the A/D sampling circuit is connected with a high-resistance isolating circuit, and the high-resistance isolating circuit is respectively connected with a three-phase electric detection unit, a grounding detection unit and an electric leakage detection unit; the three-phase electric detection unit, the grounding detection unit and the electric leakage detection unit are all electrically connected with the three-phase five-wire of the protector power supply. This scheme application carries out real-time supervision to the electrical safety in the security apparatus through three-phase electricity detecting element, ground connection detecting element and electric leakage detecting element on the security apparatus, guarantees the normal operating of equipment, and real-time understanding power consumption safety information has filled the market blank of present security apparatus function singleness.
Description
Technical Field
The utility model relates to a protector technical field, concretely relates to protector circuit protection detecting system.
Background
Whether the power supply of the equipment in the field operation vehicle can be monitored in real time, when the power supply has faults such as overvoltage protection, undervoltage protection, open-phase protection, phase-fault protection and the like, a contact control signal for alarming output and protecting circuit action output is provided for a user through a relay output mode, and the functions of alarming and protecting are achieved so as to ensure the normal operation of the electric equipment.
Because the field operation vehicle often changes the operation place, the earth connection also can change the position along with the vehicle, and whether it connects really, connects firmly and can bring immeasurable loss to power supply unit, instrument and personnel's safety in the vehicle.
At present, vehicles for field operation are all provided with a vehicle-mounted power distribution protector for ensuring personal safety, the overvoltage protection principle is adopted, the safe voltage is set at a certain value, such as 36V, but when the vehicles are operated in the open, the vehicles are not safe, the voltage is not high, but the excessive current can cause ventricular fibrillation of people to cause death. Generally, 1mA of current is sensed when passing through a human body, the human body is difficult to get rid of at least 25mA, 50mA of current is life risk, and the current mainly causes cardiac arrest and respiratory paralysis. The greater the current passing through the body, the more serious the damage to the body. The overvoltage leakage detection device is not necessarily safe.
SUMMERY OF THE UTILITY MODEL
The above-mentioned not enough to prior art, the utility model provides a can realize safety protection of security personnel ware circuit protection detecting system of multi-functional circuit safety inspection.
In order to achieve the purpose of the invention, the technical scheme adopted by the utility model is as follows:
the protection and detection system comprises a programmable logic device, wherein the programmable logic device is connected with an A/D sampling circuit and an operation relay, the A/D sampling circuit is connected with a high-resistance isolating circuit, and the high-resistance isolating circuit is respectively connected with a three-phase electric detection unit, a grounding detection unit and an electric leakage detection unit; the three-phase electric detection unit, the grounding detection unit and the electric leakage detection unit are all electrically connected with the three-phase five-wire of the protector power supply.
Further, the three-phase electric detection unit comprises an overvoltage indicator light, an undervoltage indicator light and a phase failure indicator light, and the overvoltage indicator light, the undervoltage indicator light and the phase failure indicator light are all connected with the programmable logic controller.
Furthermore, the grounding detection unit comprises an autotransformer T1, one end of a voltage regulating winding of the autotransformer T1 is connected with a three-phase five-wire live wire, and the other end of the voltage regulating winding is connected with a zero line of the three-phase five-wire live wire and a high-resistance isolation circuit; the voltage regulating end of the autotransformer T1 is connected with a grounding end and a high-resistance isolation circuit through a wire, and a current transformer Ta is arranged between the voltage regulating end and the grounding end and is connected with the high-resistance isolation circuit.
Further, the ground detection unit comprises a ground fault indicator light, and the ground fault indicator light is connected with the programmable logic device.
Furthermore, the leakage detection unit comprises a current transformer Tb, phase lines and zero lines in the three-phase five lines of the protector power supply penetrate through an annular iron core of the current transformer Tb, and an output lead of the current transformer Tb is connected with the high-resistance isolation circuit.
Furthermore, a test button SB and a current-limiting resistor RL which are connected in series are connected between the zero line and the live line of the three-phase five-line.
Furthermore, the leakage detection unit also comprises a PE wire, and two ends of the PE wire are respectively connected with the zero line of the three-phase five-wire, the equipment shell and the high-resistance isolation circuit.
Furthermore, the programmable logic device is also connected with an LED display panel and a parameter setting panel.
The utility model has the advantages that: this scheme application carries out real-time supervision to the electrical safety in the security apparatus through three-phase electricity detecting element, ground connection detecting element and electric leakage detecting element on the security apparatus, guarantees the normal operating of equipment, and real-time understanding power consumption safety information has filled the market blank of present security apparatus function singleness. The three-phase electric detection unit samples voltage by directly connecting the three-phase five-wire of the protector power supply into an A/D sampling circuit, inputs the voltage into a programmable logic device and compares the voltage with a set standard value, and if the sampled voltage is higher or lower than the standard value, the overvoltage or undervoltage problem is proved to occur; the programmable logic device immediately closes the running relay and gives an alarm.
The grounding detection unit adopts a double-clamp method to measure the grounding resistance value, is simple in operation, can test without disconnecting a power supply when in normal work, does not need to insert a measuring probe, does not need to separate a tested electrode, and only needs the double clamps to clamp a grounding conductor to measure the grounding resistance: the precision is high, and can reach 0.01 omega; the anti-interference capability is strong, and various power frequency harmonic waves can be filtered out.
The grounding detection unit is provided with an autotransformer T1 (voltage clamp) and a current transformer Ta (current clamp), the autotransformer T1 provides a potential E in a loop and generates a current I in a tested loop, and the measurement of the potential E and the current I is carried out by ohm's law: obtaining the value of the grounding resistance when R is equal to E/I; and the signal is input into a programmable logic device to be compared with a set standard value of the grounding resistance, and whether the signal meets the requirement is judged. If the fault is judged, the control signal is output to disconnect the operation relay, so that the purposes of cutting off the main circuit, protecting the electric equipment and ensuring the life safety are achieved.
One end of a PE wire of the electric leakage detection unit is connected with the equipment shell, and the other end of the PE wire is independently grounded or connected with a zero line; when the equipment leaks electricity, and the voltage to ground of the shell of the equipment reaches a dangerous value set by the programmable logic device, the operation relay is disconnected, and the power supply is cut off. The protected three-phase five-wire and neutral wire penetrate through the annular iron core of the current transformer Tb to form a primary coil of the transformer, the winding wound on the annular iron core forms a secondary coil of the current transformer Tb, and if no electric leakage occurs, the sum of current vectors flowing through the three-phase wire and the neutral wire is equal to zero, so that corresponding induced electromotive force cannot be generated on the secondary coil. If leakage occurs, the sum of the current vectors of the three-phase line and the neutral line is not equal to zero, so that induced electromotive force is generated on the secondary coil, and the signal is sent to the programmable logic device to disconnect the operation relay.
Since the leakage detecting unit is a protection device, it should be checked whether it is good and reliable at regular intervals. The leakage path is simulated by the series connection of the test button SB and the current limiting resistor RL to check whether the device can operate normally. The LED display panel is used for displaying detected data information, and various standard values in the programmable logic device can be set through the parameter setting panel.
Drawings
Fig. 1 is an electrical schematic diagram of a security device and circuit protection detection system.
Fig. 2 is a schematic diagram of the ground fault detection unit.
Fig. 3 is a schematic diagram of the leakage detecting unit.
Fig. 4 is a schematic diagram of a three-phase electric detection unit.
Fig. 5 is a circuit diagram of an a/D sampling circuit.
Fig. 6 is a circuit diagram of a high impedance isolation circuit.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and various changes may be made apparent to those skilled in the art within the spirit and scope of the present invention as defined and defined by the appended claims.
As shown in fig. 1, the circuit protection and detection system of the protector includes a programmable logic device, the programmable logic device is connected with an a/D sampling circuit and an operation relay of the protector, the a/D sampling circuit is connected with a high-resistance isolating circuit, and the high-resistance isolating circuit is respectively connected with a three-phase electric detection unit, a grounding detection unit and an electric leakage detection unit; the three-phase electric detection unit, the grounding detection unit and the electric leakage detection unit are all electrically connected with a three-phase five-wire of the protector power supply. The programmable logic device adopts an EPM series PLC programmable logic controller.
This scheme application carries out real-time supervision to the safety of safety cut-out ware through three-phase electricity detecting element, ground connection detecting element and electric leakage detecting element on the safety cut-out ware, guarantees the normal operating of equipment, and real-time understanding power consumption safety information has filled the market blank of present safety cut-out ware function singleness. As shown in fig. 5 and 6, the a/D sampling circuit and the high-resistance isolation circuit together implement sampling of voltages of each unit in the acquisition system, and input the sampled voltages to the programmable logic device for processing.
As shown in fig. 4, the three-phase electric detection unit includes an overvoltage indicator light, an undervoltage indicator light and a phase-failure indicator light, and the overvoltage indicator light, the undervoltage indicator light and the phase-failure indicator light are all connected with the programmable logic controller. The three-phase electric detection unit directly accesses a phase line and a zero line in three-phase five-wire of a protector power supply into an A/D sampling circuit to sample voltage, inputs the voltage into a programmable logic device to be compared with a set standard value, and if the sampled voltage is higher or lower than the set standard value, the problem of overvoltage or undervoltage is proved; the programmable logic device immediately closes the running relay and gives an alarm.
As shown in fig. 2, the ground detection unit includes an autotransformer T1, one end of a voltage-regulating winding of the autotransformer T1 is connected to a live wire of the three-phase five-wire, and the other end is connected to a zero wire of the three-phase five-wire and a high-resistance isolation circuit; the voltage regulating end of the autotransformer T1 is connected with a grounding end and a high-resistance isolation circuit through a wire, and a current transformer Ta is arranged between the voltage regulating end and the grounding end and is connected with the high-resistance isolation circuit. The ground detection unit comprises a ground fault indicator light, and the ground fault indicator light is connected with the programmable logic controller.
The grounding detection unit adopts a double-clamp method to measure the grounding resistance value, is simple in operation, can test without disconnecting a power supply when in normal work, does not need to insert a measuring probe, does not need to separate a tested electrode, and only needs the double clamps to clamp a grounding conductor to measure the grounding resistance: the precision is high, and can reach 0.01 omega; the anti-interference capability is strong, and various power frequency harmonic waves can be filtered out.
The grounding detection unit is provided with an autotransformer T1 (voltage clamp) and a current transformer Ta (current clamp), the autotransformer T1 provides a potential E in a loop and generates a current I in a tested loop, and the measurement of the potential E and the current I is carried out by ohm's law: obtaining the value of the grounding resistance when R is equal to E/I; and the signal is input into a programmable logic device to be compared with a set standard value of the grounding resistance, and whether the signal meets the requirement is judged. If the fault is judged, a control signal is output to disconnect the running relay, and the ground fault indicator lamp gives an alarm, so that the aims of cutting off the main circuit, protecting the electric equipment and ensuring the safety of people are fulfilled.
As shown in fig. 3, the leakage detecting unit includes a current transformer Tb, the phase line and the zero line to be protected in the three-phase five-line of the power supply of the protector pass through the annular iron core of the current transformer Tb, and both the current transformer Tb and the zero line of the three-phase five-line are connected with the high-resistance isolating circuit. And a test button SB and a current-limiting resistor RL which are connected in series are connected between the zero line and the live line of the three-phase five-wire. The electric leakage detection unit also comprises a PE wire, and two ends of the PE wire are respectively connected with a zero line of the three-phase five-wire, the equipment shell and the high-resistance isolation circuit. The programmable logic device is also connected with an LED display panel and a parameter setting panel.
One end of a PE wire of the electric leakage detection unit is connected with the equipment shell, and the other end of the PE wire is independently grounded or connected with a zero line; when the equipment leaks electricity, and the voltage to ground of the shell of the equipment reaches a dangerous value set by the programmable logic device, the operation relay is disconnected, and the power supply is cut off. The protected three-phase line and the neutral line penetrate through the annular iron core of the current transformer Tb to form a primary coil of the transformer, the winding wound on the annular iron core forms a secondary coil of the current transformer Tb, and if no electric leakage occurs, the sum of current vectors flowing through the three-phase line and the neutral line is equal to zero, so that corresponding induced electromotive force cannot be generated on the secondary coil. If leakage occurs, the sum of the current vectors of the three-phase line and the neutral line is not equal to zero, so that induced electromotive force is generated on the secondary coil, and the signal is sent to the programmable logic device to disconnect the operation relay.
Since the leakage detecting unit is a protection device, it should be checked whether it is good and reliable at regular intervals. The leakage path is simulated by the series connection of the test button SB and the current limiting resistor RL to check whether the device can operate normally. The LED display panel is used for displaying detected data information, and various standard values in the programmable logic device can be set through the parameter setting panel.
Claims (8)
1. A circuit protection detection system of a protector is characterized by comprising a programmable logic device, wherein the programmable logic device is connected with an A/D sampling circuit and an operation relay, the A/D sampling circuit is connected with a high-resistance isolating circuit, and the high-resistance isolating circuit is respectively connected with a three-phase electric detection unit, a grounding detection unit and an electric leakage detection unit; and the three-phase electric detection unit, the grounding detection unit and the electric leakage detection unit are all electrically connected with a three-phase five-wire of the protector power supply.
2. The protection and detection system of a safety cut-out circuit according to claim 1, wherein the three-phase electric detection unit comprises an overvoltage indicator light, an undervoltage indicator light and a phase failure indicator light, and the overvoltage indicator light, the undervoltage indicator light and the phase failure indicator light are all connected with a programmable logic controller.
3. The protection and detection system of the circuit of the safety cut-out according to claim 1, characterized in that, the grounding detection unit comprises an autotransformer T1, one end of the voltage regulating winding of the autotransformer T1 is connected with a three-phase five-wire live wire, and the other end is connected with a zero wire of the three-phase five-wire live wire and a high-resistance isolation circuit; the voltage regulating end of the autotransformer T1 is connected with a grounding end and a high-resistance isolating circuit through a wire, a current transformer Ta is arranged between the voltage regulating end and the grounding end, and the current transformer Ta is connected with the high-resistance isolating circuit.
4. The security circuit protection detection system of claim 1 wherein the ground detection unit comprises a ground fault indicator light, the fault indicator light being connected to a programmable logic device.
5. The circuit protection and detection system of a safety device according to claim 1, wherein the leakage detection unit comprises a current transformer Tb, wherein the phase line and the zero line of the three-phase five-line of the power supply of the safety device penetrate through the annular iron core of the current transformer Tb, and the output lead of the current transformer Tb is connected with the high-resistance isolation circuit.
6. The protection and detection system of a safety cut-out circuit according to claim 5, characterized in that a test button SB and a current limiting resistor RL are connected in series between the zero line and the live line of the three-phase five-line.
7. The protection and detection system of a protector circuit according to claim 5, characterized in that, the leakage detection unit further comprises a PE wire, and two ends of the PE wire are respectively connected with a zero line of the three-phase five-wire, an equipment shell and a high-resistance isolation circuit.
8. The protection and detection system for a circuit of a security device as claimed in claim 1, wherein the programmable logic device is further connected with an LED display panel and a parameter setting panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921058153.6U CN210222113U (en) | 2019-07-08 | 2019-07-08 | Circuit protection detection system of protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921058153.6U CN210222113U (en) | 2019-07-08 | 2019-07-08 | Circuit protection detection system of protector |
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| CN210222113U true CN210222113U (en) | 2020-03-31 |
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| CN201921058153.6U Active CN210222113U (en) | 2019-07-08 | 2019-07-08 | Circuit protection detection system of protector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208594A (en) * | 2019-07-08 | 2019-09-06 | 成都通用整流电器研究所 | A kind of protector circuit protection detection system |
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- 2019-07-08 CN CN201921058153.6U patent/CN210222113U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208594A (en) * | 2019-07-08 | 2019-09-06 | 成都通用整流电器研究所 | A kind of protector circuit protection detection system |
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