CN211478606U - Electric leakage monitoring device suitable for oil field well site - Google Patents
Electric leakage monitoring device suitable for oil field well site Download PDFInfo
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- CN211478606U CN211478606U CN201922265843.5U CN201922265843U CN211478606U CN 211478606 U CN211478606 U CN 211478606U CN 201922265843 U CN201922265843 U CN 201922265843U CN 211478606 U CN211478606 U CN 211478606U
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Abstract
The utility model discloses an electric leakage monitoring device suitable for an oil field well site, which relates to the technical field of electric leakage protection and insulation monitoring, and adopts the technical proposal that the electric leakage monitoring device comprises a power module, a functional module and an output module; the input end of the functional module is connected with the tested circuit, and the output end of the functional module is connected with the output module; the function module comprises a sampling resistor connected with a tested line, the sampling resistor is connected with the input end of an amplifier, the output end of the amplifier is connected with the input end of a comparator, the input end of the comparator is also connected with an adjusting circuit, and the adjusting circuit consists of a knob switch and an alarm threshold; the output module consists of a relay and an alarm output device, and the output end of the comparator is connected with the alarm output device through the relay. The utility model has the advantages that: this scheme passes through rotary switch and sets up insulating threshold value to reach the purpose of early warning in advance, outage tripping operation, guaranteed the safe handling of electric line, simultaneously, can the self-checking, reliability when guaranteeing online operation.
Description
Technical Field
The utility model relates to an earth leakage protection and insulation monitoring technical field, in particular to electric leakage monitoring device suitable for oil field well site.
Background
The oil field well site has serious electric leakage and electric shock potential safety hazard, and when an electric circuit or equipment is used for a long time and is influenced by factors such as extrusion damage, bite of animals and the like, insulation damage can occur, once a human body contacts the insulation damage parts, a ground short circuit can be formed, electric leakage occurs, and the personal safety is threatened. In addition, in the case of electrical lines or equipment, the cause of short-circuiting to ground may be due to energy release caused by high temperature, arcing, etc., and if such energy is not removed in time, an electrical fire may be caused.
The electric power lines of the oil field well site are mostly neutral point ungrounded systems, the voltage grades are more than eight types, such as 380V, 660V, 1140V, 2250V and the like, and the common residual current type electric leakage protection products in the market are not suitable due to the special wiring mode and voltage grades.
SUMMERY OF THE UTILITY MODEL
To the technical problem, the utility model provides an electric leakage monitoring devices suitable for oil field well site.
The technical scheme is that the device comprises a power supply module, a functional module and an output module;
the input end of the functional module is connected with the circuit to be tested, the output end of the functional module is connected with the output module, and the power supply module supplies power to the device;
the function module comprises a sampling resistor connected with a tested line, the sampling resistor is connected with the input end of an amplifier, the output end of the amplifier is connected with the input end of a comparator, the input end of the comparator is also connected with an adjusting circuit, and the adjusting circuit consists of a knob switch and an alarm threshold;
the output module consists of a relay and an alarm output device, and the output end of the comparator is connected with the alarm output device through the relay.
Preferably, the alarm threshold is an adjustable resistor.
Preferably, the alarm output device is a warning lamp or a buzzer.
Preferably, the function module further comprises a self-testing circuit, the self-testing circuit comprises a change-over switch, one input end of the change-over switch is connected with the circuit to be tested, the other input end of the change-over switch is connected with a self-testing loop, the self-testing loop comprises a self-testing resistor, and the output end of the change-over switch is connected with the sampling resistor.
Preferably, the power module is powered by a battery.
Preferably, the power supply module is connected with an alternating current power supply, and is connected with a rectifying circuit through a transformer, and the output ends of the rectifying circuit are connected with a filter circuit.
Preferably, the rectifier circuit comprises two bridge rectifier circuits, the two bridge rectifier circuits are both connected with the transformer, and the two filter circuits are arranged corresponding to the bridge rectifier circuits;
the first bridge rectifier circuit supplies power to the functional module, and the second bridge rectifier circuit supplies power to the rest part of the device;
the output end of the first bridge rectifier circuit is connected with a voltage stabilizer, and both ends of the voltage stabilizer are respectively provided with a rectifier capacitor;
and the output end of the second bridge rectifier circuit is connected with the other group of rectifier capacitors.
Preferably, the transformer is a three-tap isolation transformer.
Preferably, the amplifier is a TL061 operational amplifier.
The embodiment of the utility model provides a beneficial effect that technical scheme brought is: the leakage protection device provided by the scheme is small, exquisite, light and convenient to install. The alarm threshold is set by the knob, a power supply flows through a circuit, and leakage current is generated due to the existence of the insulation resistor; the leakage current flows through the sampling resistor to generate voltage, the voltage is output after being filtered and amplified by the amplifier, on one hand, the amplified signal is input into the comparator through the magnetic meter head to indicate the resistance value, on the other hand, the amplified signal is compared with a set threshold value, if the amplified signal exceeds the threshold value, the alarm LED is on, and the state of the relay is changed. The output module is a green power supply indicating LED lamp, a red alarm LED lamp and an LED which respectively indicate a power supply and an alarm state; the relay is connected with an external protection circuit. This scheme passes through rotary switch and sets up insulating threshold value to reach the purpose of early warning in advance, outage tripping operation, guaranteed the safe handling of electric line, simultaneously, can the self-checking, reliability when guaranteeing online operation.
Drawings
Fig. 1 is a schematic block diagram of an embodiment of the present invention.
Fig. 2 is a circuit diagram of a power module according to an embodiment of the present invention.
Fig. 3 is a first circuit diagram of a functional module according to an embodiment of the present invention.
Fig. 4 is a circuit diagram of a functional module according to an embodiment of the present invention.
Fig. 5 is a third circuit diagram of the functional module according to the embodiment of the present invention.
Fig. 6 is a fourth circuit diagram of the functional module according to the embodiment of the present invention.
Fig. 7 is a circuit diagram of an output module according to an embodiment of the present invention.
Fig. 8 is a first schematic circuit diagram of an application state according to an embodiment of the present invention.
Fig. 9 is a second schematic circuit diagram of an application state according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. Of course, the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that the embodiments and features of the embodiments of the present invention can be combined with each other without conflict.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, unless otherwise specified, "a plurality" means two or more.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
Example 1
Referring to fig. 1 and 2, the present invention provides an electric leakage monitoring device suitable for an oil field well site, which includes a power module, a function module, and an output module;
the input end of the functional module is connected with the tested circuit, the output end of the functional module is connected with the output module, and the power supply module supplies power to the device;
the function module comprises a sampling resistor connected with a tested line, the sampling resistor is connected with the input end of an amplifier, the output end of the amplifier is connected with the input end of a comparator, the input end of the comparator is also connected with an adjusting circuit, and the adjusting circuit consists of a knob switch and an alarm threshold;
the output module consists of a relay and an alarm output device, and the output end of the comparator is connected with the alarm output device through the relay.
The alarm threshold is an adjustable resistor.
The alarm output device is a warning lamp.
The function module also comprises a self-testing circuit, the self-testing circuit comprises a change-over switch, one input end of the change-over switch is connected with the tested circuit, the other input end of the change-over switch is connected with a self-testing loop, the self-testing loop comprises a self-testing resistor, and the output end of the change-over switch is connected with the sampling resistor.
The power module is powered by a battery.
The power supply module is connected with an alternating current power supply and is connected with the rectifying circuit through the transformer, and the output end of the rectifying circuit is connected with the filter circuit.
The rectifying circuit comprises two bridge rectifying circuits, the two bridge rectifying circuits are both connected with the transformer, and the two filter circuits are arranged corresponding to the two bridge rectifying circuits;
the first bridge rectifier circuit supplies power to the functional module, and the second bridge rectifier circuit supplies power to the rest part of the device; the output end of the first bridge rectifier circuit is connected with a voltage stabilizer, and both ends of the voltage stabilizer are respectively provided with a rectifier capacitor; and the output end of the second bridge rectifier circuit is connected with the other group of rectifier capacitors.
The transformer is a three-tap isolation transformer.
The amplifier is a TL061 operational amplifier.
Example 2
On the basis of embodiment 1, the electric leakage monitoring device suitable for the oil field well site comprises a power supply module, a functional module and an output module;
the input end of the functional module is connected with the tested circuit, the output end of the functional module is connected with the output module, and the power supply module supplies power to the device;
the function module comprises a sampling resistor connected with a tested line, the sampling resistor is connected with the input end of an amplifier, the output end of the amplifier is connected with the input end of a comparator, the input end of the comparator is also connected with an adjusting circuit, and the adjusting circuit consists of a knob switch and an alarm threshold;
the output module consists of a relay and an alarm output device, and the output end of the comparator is connected with the alarm output device through the relay.
The alarm threshold is an adjustable resistor, the adjustable resistor is designed in eight steps from 0.01 megaohm to 0.5 megaohm, the sensitivity of the device is gradually reduced by adjusting the adjustable resistor, the gear is adjusted according to the crowd density, the well group density, the well site humidity and other external working environments, and the device is suitable for various occasions such as sunny days, rain fog, water logging and the like; wherein the method also comprises self-test and shore power
The alarm output device is a warning lamp and a buzzer, and the warning lamp is an LED lamp.
The function module also comprises a self-testing circuit, the self-testing circuit comprises a change-over switch, one input end of the change-over switch is connected with the tested circuit, the other input end of the change-over switch is connected with a self-testing loop, the self-testing loop comprises a self-testing resistor, and the output end of the change-over switch is connected with the sampling resistor.
The power module is powered by a battery. The model number of the power supply module is 78L 12.
The power supply module is connected with an alternating current power supply and is connected with the rectifying circuit through the transformer, and the output end of the rectifying circuit is connected with the filter circuit.
The rectifying circuit comprises two bridge rectifying circuits, the two bridge rectifying circuits are both connected with the transformer, and the two filter circuits are arranged corresponding to the two bridge rectifying circuits;
the first bridge rectifier circuit supplies power to the functional module, and the second bridge rectifier circuit supplies power to the rest part of the device; the output end of the first bridge rectifier circuit is connected with a voltage stabilizer, and both ends of the voltage stabilizer are respectively provided with a rectifier capacitor; and the output end of the second bridge rectifier circuit is connected with the other group of rectifier capacitors.
The transformer is a three-tap isolation transformer.
The amplifier is a TL061 operational amplifier.
By the composition structure of the device, various voltage levels including 380V, 660V and 1140V can be applied.
Example 3
Referring to fig. 1 to 9, the present application includes:
a power supply module: providing an isolation detection power supply and a functional module power supply;
a functional module: measuring the insulation resistance value of the tested circuit, comparing the insulation resistance value with a set fixed value, and carrying out corresponding alarm indication and output according to the result;
an output module: and the alarm output empty node is used for controlling other equipment.
Referring to fig. 2, a circuit diagram of a power module is shown.
T1 is isolation transformer, D1, D2 are rectifier bridge, U2, U3 are LDO (low dropout regulator). And completing the power supply for the internal functional module and the output module of the device.
79L12 is selected as a power supply module, E2, E3, E4 and E5 are rectifier tantalum capacitors, and the rectifier tantalum capacitors have the functions of filtering and stabilizing voltage. The selection of the rectifier bridge is to ensure the selection of the capacity required by the rear-stage functional module, and the rectifier bridge of 1A is preferably selected. The isolation transformer at the most front stage is a small isolation transformer with three taps, which is the key of design and ensures that the device does not interfere with the external environment.
Referring to fig. 3-6, functional block circuit diagrams of the device are shown.
The core U1 operational amplifier, U6 knob switch, U4 optoelectronic coupler and other circuits are formed, and comparison and indication of insulation resistance to ground of the tested line are completed.
In the loop, a TL061 operational amplifier is preferentially selected, a non-inverting input terminal of the operational amplifier is connected to an output terminal of a setting circuit, an inverting input terminal of the operational amplifier is connected to an output terminal of an acquisition circuit and a first terminal of a first resistor R1, a second terminal of a first resistor R1 is connected to a first terminal of a first capacitor C1, a second terminal of a first capacitor C1 is connected to an output terminal of the operational amplifier and a first terminal of a second resistor R2, a second terminal of a second resistor R2 is connected to a base of a first triode T1, an emitter of the first triode T1 is grounded, and a collector of the first triode T1 is connected to a second terminal of a first capacitor C1.
The adjustable resistors RW1 and RW2 realize adjustment of measurement and comparison accuracy.
And the knob switch U6 is used for linking the resistors with different resistance values with the self-checking resistor to the input end of the operational amplifier to finish comparison.
L1, L2 and L3 are three light emitting triodes to complete alarm indication.
The isolation of strong and weak current is completed by a U4 photoelectric coupler.
Fig. 7 is a circuit diagram of the device output module.
The core component U9, U10 relay and triode. And finishing the output control of the detection result.
And the signal output or circuit control is completed by driving two ohm dragon relays through the triode.
Fig. 8 and 9 are two reference ways of using a battery as a power supply and rectifying the power to obtain dc power supply for the device according to the present embodiment.
In summary, in the leakage protection device provided by the present invention, the knob is set with the alarm threshold (at this time, the input default is a single-phase line), the power source flows through the line, and leakage current is generated due to the existence of the insulation resistor; the leakage current flows through the sampling resistor to generate voltage, the voltage is output after being filtered and amplified by the amplifier, on one hand, the amplified signal is input into the comparator through the magnetic meter head to indicate the resistance value, on the other hand, the amplified signal is compared with a set threshold value, if the amplified signal exceeds the threshold value, the alarm LED is on, and the state of the relay is changed. The output module is a green power supply indicating LED lamp, a red alarm LED lamp and an LED which respectively indicate a power supply and an alarm state; the relay is connected with an external protection circuit.
Examples of the applications
On the basis of the embodiment, the device is applied to measuring the insulation resistance value on a low-voltage line in real time, 19 leakage monitoring devices are installed in a region 2 of a lump 107 line management, wherein 3 oil well opening leakage monitoring instruments give an alarm, and the main breaker of an oil well switch box is powered off. The specific data of the field measurement are as follows:
135 electric leakage monitors are installed in 3 district's of management, and wherein 1 oil well electric leakage monitors of opening a well report to the police, and the site survey concrete data is as follows:
150 leakage monitoring instruments are installed in the management 4 area, and the alarm phenomenon of the leakage monitoring instruments for well opening of the oil well does not occur.
77 electric leakage monitors are installed in the management 5 area, and the alarm phenomenon of the electric leakage monitor for well opening of the oil well does not occur.
And 200 leakage monitoring instruments are installed in the management 6 areas, wherein 12 oil well open leakage monitoring instruments give an alarm to cause the power failure of a main breaker of an oil well switch box. The specific data of the field measurement are as follows:
and 82 electric leakage monitoring instruments are installed in the management 7 area, wherein 2 oil well open electric leakage monitoring instruments give an alarm to cause the power failure of a main breaker of an oil well switch box. The specific data of the field measurement are as follows:
example 4
On the basis of the above embodiment, the whole device is a box body, an eight-gear knob and a wiring bar are arranged outside the box body, the wiring bar is provided with eleven hole sites, each hole site corresponds to a compression screw for compressing an electric wire, wherein 1-3 hole sites are power hole sites, 5 hole sites are sampling hole sites, 7-9 hole sites are operation hole sites, and 11 hole sites are grounding hole sites.
Two layers of circuit boards are arranged inside the device, and the two layers of circuit boards are supported and separated through the vertical rods. The design of double-deck circuit board is arranged and can be reduced the device volume, and has better radiating effect.
And the main components in the device and the outer sides of the contacts are wrapped with protective materials.
The protective material is epoxy resin, and the purpose is to prevent salt mist erosion.
Still reserve the warning light through-hole on the casing for place the warning light.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (9)
1. An electric leakage monitoring device suitable for an oil field well site is characterized by comprising a power supply module, a functional module and an output module;
the input end of the functional module is connected with the circuit to be tested, the output end of the functional module is connected with the output module, and the power supply module supplies power to the device;
the function module comprises a sampling resistor connected with a tested line, the sampling resistor is connected with the input end of an amplifier, the output end of the amplifier is connected with the input end of a comparator, the input end of the comparator is also connected with an adjusting circuit, and the adjusting circuit consists of a knob switch and an alarm threshold;
the output module consists of a relay and an alarm output device, and the output end of the comparator is connected with the alarm output device through the relay.
2. An electrical leakage monitoring device suitable for use in oilfield wellsites as defined in claim 1, wherein the alarm threshold is an adjustable resistance.
3. An electrical leakage monitoring device suitable for use in oilfield wellsites as defined in claim 1, wherein the alarm output device is a warning light or a buzzer.
4. The electrical leakage monitoring device for use in an oilfield wellsite as defined by claim 1 wherein the functional module further comprises a self-test circuit comprising a switch having one input connected to the circuit under test and another input connected to a self-test loop comprising a self-test resistor, the output of the switch being connected to the sampling resistor.
5. An electrical leakage monitoring apparatus suitable for use in oilfield wellsites as defined in claim 3, wherein the power module is battery powered.
6. An electrical leakage monitoring device suitable for use in oilfield wellsites as claimed in claim 3, wherein the power supply module is connected to an ac power supply, and is connected to a rectifying circuit via a transformer, and the output terminals of the rectifying circuit are connected to the filter circuit.
7. An electrical leakage monitoring device suitable for use in oilfield wellsites as defined in claim 6, wherein the rectifying circuit comprises two bridge rectifying circuits, both bridge rectifying circuits being connected to the transformer, and two filter circuits being provided corresponding to the bridge rectifying circuits;
the first bridge rectifier circuit supplies power to the functional module, and the second bridge rectifier circuit supplies power to the rest part of the device; the output end of the first bridge rectifier circuit is connected with a voltage stabilizer, and both ends of the voltage stabilizer are respectively provided with a rectifier capacitor; and the output end of the second bridge rectifier circuit is connected with the other group of rectifier capacitors.
8. An electrical leakage monitoring apparatus suitable for use in oilfield wellsites as defined in claim 7 wherein the transformer is a three tap isolation transformer.
9. An electrical leakage monitoring apparatus suitable for use at an oilfield wellsite as defined in any one of claims 1 to 8, wherein the amplifier is a TL061 operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922265843.5U CN211478606U (en) | 2019-12-16 | 2019-12-16 | Electric leakage monitoring device suitable for oil field well site |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922265843.5U CN211478606U (en) | 2019-12-16 | 2019-12-16 | Electric leakage monitoring device suitable for oil field well site |
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| Publication Number | Publication Date |
|---|---|
| CN211478606U true CN211478606U (en) | 2020-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922265843.5U Active CN211478606U (en) | 2019-12-16 | 2019-12-16 | Electric leakage monitoring device suitable for oil field well site |
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| CN (1) | CN211478606U (en) |
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