CN109245041B - Leakage protection device - Google Patents

Leakage protection device Download PDF

Info

Publication number
CN109245041B
CN109245041B CN201811257482.3A CN201811257482A CN109245041B CN 109245041 B CN109245041 B CN 109245041B CN 201811257482 A CN201811257482 A CN 201811257482A CN 109245041 B CN109245041 B CN 109245041B
Authority
CN
China
Prior art keywords
resistor
diode
current
leakage
triode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201811257482.3A
Other languages
Chinese (zh)
Other versions
CN109245041A (en
Inventor
刘孟芸
周彪
罗明
赵峰
王金泉
孙红海
修成蔚
李全会
朱洪明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yankuang Donghua Heavy Industry Co ltd
Original Assignee
Yankuang Donghua Heavy Industry Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yankuang Donghua Heavy Industry Co ltd filed Critical Yankuang Donghua Heavy Industry Co ltd
Priority to CN201811257482.3A priority Critical patent/CN109245041B/en
Publication of CN109245041A publication Critical patent/CN109245041A/en
Application granted granted Critical
Publication of CN109245041B publication Critical patent/CN109245041B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
    • H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/06—Details with automatic reconnection
    • H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection

Landscapes

  • Emergency Protection Circuit Devices (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The invention discloses a leakage protection device, comprising: the acquisition module is used for acquiring the current leakage insulation value of the electric circuit; the control module is used for controlling the main switch of the electric circuit to be disconnected when the current leakage insulation value is smaller than or equal to the insulation safety value; the main switch is also used for controlling the main switch to be closed when the current leakage insulation value is larger than the insulation safety value; and the display module is used for displaying the state corresponding to the current leakage insulation value. According to the invention, the leakage state of the electric circuit is displayed in real time through the display module, when the leakage insulation value is reduced, the display module can display the state corresponding to the current leakage insulation value in real time, so that the aim of early warning is fulfilled, the safe use of the electric circuit is ensured, meanwhile, after the leakage insulation value is restored to the insulation safety value, the electric circuit can be automatically reset, the electric circuit is conducted, the early warning of the display module is released, and the reliability and the safety of the leakage protection are improved.

Description

Leakage protection device
Technical Field
The present application relates to the field of leakage protection, and in particular, to a leakage protection device.
Background
When the electric circuit or the equipment is influenced by factors such as extrusion damage, biting of animals and the like due to long-term use, insulation damage can occur, once a human body contacts the insulation damaged parts, a ground short circuit can be formed, leakage occurs, and the personal safety is threatened. In addition, for electrical lines or equipment, the cause of the short circuit to ground may also be due to the release of energy from high temperatures, arcs, etc., which may cause an electrical fire if not timely expelled. The leakage protector is one important protector for preventing human body from getting electric shock by short circuit to ground and timely breaking high voltage circuit.
It can be understood that when the insulation of an electrical circuit or equipment is damaged, the leakage insulation value can be reduced, the existing leakage protection device generally directly triggers the protection function when the leakage insulation value reaches or is lower than the insulation safety value, the whole electrical circuit is cut off, and synchronous early warning cannot be realized in the process of reducing the leakage insulation value, so that workers cannot find that the circuit insulation value is reduced in advance and timely take protection measures, and the safety and reliability of the existing leakage protection device are lower.
Therefore, how to provide a solution to the above technical problem is a problem that a person skilled in the art needs to solve at present.
Disclosure of Invention
The utility model aims at providing a leakage protection device, show the electric leakage state of electric line in real time through display module to reach the purpose of early warning in advance, guaranteed electric line's safe handling, simultaneously, can automatic re-setting, control electric line switch on after the insulating safe value of electric leakage insulation value resumes, the early warning of relieving display module has improved leakage protection's reliability and security.
In order to solve the above-mentioned technical problems, the invention provides a leakage protection device, comprising:
the acquisition module is used for acquiring the current leakage insulation value of the electric circuit;
the control module is used for controlling the main switch of the electric circuit to be disconnected when the current leakage insulation value is smaller than or equal to the insulation safety value; the main switch is also used for controlling the main switch to be closed when the current leakage insulation value is larger than the insulation safety value;
and the display module is used for displaying the state corresponding to the current leakage insulation value.
Preferably, the acquiring module is specifically configured to:
acquiring the current leakage voltage of the electric circuit;
and obtaining the current leakage insulation value according to the current leakage voltage.
Preferably, the control module includes:
a setting unit for setting a safety voltage corresponding to the insulation safety value;
the amplifying unit is used for obtaining the current leakage current according to the current leakage voltage and the safety voltage, amplifying the current leakage current according to a preset rule and obtaining a state current for triggering the protection unit;
the protection unit is used for controlling the main switch to be disconnected when the state current is greater than or equal to the action current; the main switch is further used for controlling the main switch to be closed when the state current is smaller than the action current, wherein the action current is a current corresponding to the insulation safety value;
the display module is specifically configured to display a state corresponding to the state current.
Preferably, the amplifying unit includes an operational amplifier, a first resistor, a second resistor, a first capacitor, and a first triode, wherein:
the non-inverting input end of the operational amplifier is connected with the output end of the setting unit, the inverting input end of the operational amplifier is respectively connected with the output end of the acquisition module and the first end of the first resistor, the second end of the first resistor is connected with the first end of the first capacitor, the second end of the first capacitor is respectively connected with the output end of the operational amplifier and the first end of the second resistor, the second end of the second resistor is connected with the base electrode of the first triode, the emitter electrode of the first triode is grounded, and the collector electrode of the first triode is respectively connected with the second end of the first capacitor, the protection unit, the display module and the power supply.
Preferably, the amplifying unit further includes a second triode, a base electrode of the second triode is connected with a collector electrode of the first triode, an emitter electrode of the second triode is grounded, and the collector electrode of the second triode is respectively connected with the protecting unit, the display module and the power supply.
Preferably, the protection unit includes an action relay, a first end of the action relay is connected with the base electrode of the second triode, and a second end of the action relay is connected with the collector electrode of the second triode.
Preferably, the display module includes a third resistor and a light emitting diode;
the first end of the third resistor is connected with the base electrode of the second triode, the second end of the third resistor is connected with the anode of the light-emitting diode, and the cathode of the light-emitting diode is connected with the collector electrode of the second triode.
Preferably, the obtaining module includes a fourth resistor, a fifth resistor, and a first diode, where:
the first end of the fourth resistor is connected with the electric circuit, the second end of the fourth resistor is connected with the cathode of the first diode, the anode of the first diode is connected with the first end of the fifth resistor, and the second end of the fifth resistor is used as the output end of the acquisition module.
Preferably, the setting unit includes an adjustable potentiometer and a sixth resistor, wherein:
the first end of the adjustable potentiometer is connected with the control end of the adjustable potentiometer, the first end of the sixth resistor and the power supply respectively, the second end of the adjustable potentiometer is grounded, and the second end of the sixth resistor is used as the output end of the setting unit.
Preferably, the leakage protection device further includes a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a second capacitor, a third capacitor, a second diode, a third diode, a fourth diode, and a fifth diode, wherein:
the first end of the seventh resistor is respectively connected with the first end of the eighth resistor, the first end of the ninth resistor, the first end of the tenth resistor, the cathode of the fifth diode and the power supply, the second end of the seventh resistor is respectively connected with the anode of the first diode and the cathode of the second diode, the second end of the eighth resistor is connected with the first end of the adjustable potentiometer, the anode of the second diode is respectively connected with the first end of the second capacitor and the ground, the first end of the second capacitor is connected with the anode of the first diode, the cathode of the third diode is respectively connected with the second end of the fifth resistor and the anode of the fourth diode, the anode of the third diode is respectively connected with the cathode of the fourth diode and the second end of the sixth resistor, the second end of the ninth resistor is connected with the second end of the first capacitor, the first end of the second resistor is connected with the second base of the third diode is connected with the second end of the third diode, and the third resistor is connected with the third base of the third diode.
The invention provides a leakage protection device, comprising: the acquisition module is used for acquiring the current leakage insulation value of the electric circuit; the control module is used for controlling the main switch of the electric circuit to be disconnected when the current leakage insulation value is smaller than or equal to the insulation safety value; the main switch is also used for controlling the main switch to be closed when the current leakage insulation value is larger than the insulation safety value; and the display module is used for displaying the state corresponding to the current leakage insulation value. Therefore, in practical application, the scheme of the invention is adopted, the leakage state of the electric circuit is displayed in real time through the display module, when the leakage insulation value is reduced, the display module can display the state corresponding to the current leakage insulation value in real time, so that the aim of early warning in advance is fulfilled, the safe use of the electric circuit is ensured, meanwhile, after the leakage insulation value is restored to the insulation safety value, the electric circuit can be automatically reset, the electric circuit is conducted, the early warning of the display module is relieved, and the reliability and the safety of the leakage protection are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the prior art and the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a leakage protection device according to the present invention;
FIG. 2 is a schematic diagram of another leakage protection device according to the present invention;
FIG. 3 is another embodiment of the present invention a structural schematic diagram of the leakage protection device;
FIG. 4 shows another embodiment of the present invention the structure of the leakage protection device is schematically shown.
Detailed Description
The core of the application is to provide a leakage protection device, the leakage state of an electric circuit is displayed in real time through a display module, so that the purpose of early warning in advance is achieved, the safe use of the electric circuit is guaranteed, meanwhile, the leakage protection device can be automatically reset, the electric circuit is controlled to be conducted after the leakage insulation value is restored to the insulation safety value, the early warning of the display module is relieved, and the reliability and the safety of the leakage protection are improved.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a leakage protection device according to the present invention, including:
the acquisition module 1 is used for acquiring the current leakage insulation value of the electric circuit;
the control module 2 is used for controlling the main switch of the electric circuit to be disconnected when the current leakage insulation value is smaller than or equal to the insulation safety value; the main switch is also used for controlling the main switch to be closed when the current leakage insulation value is larger than the insulation safety value;
and a display module 3 for displaying a state corresponding to the current leakage insulation value.
Specifically, when the electric circuit or the equipment is used for a long time or is affected by factors such as extrusion damage or biting of animals, the leakage insulation value of the electric circuit can be reduced, the acquisition module 1 is used for acquiring the current leakage insulation value of the electric circuit, when the current leakage insulation value is smaller than or equal to an insulation safety value, the protection function of the leakage protection device is triggered, namely the control module 2 controls the main switch of the electric circuit to be disconnected so as to realize leakage protection, wherein the insulation safety value refers to the leakage blocking value of the electric circuit, the current leakage insulation value of the electric circuit is not larger than the insulation safety value, the electric circuit is indicated to be in a leakage state, and the electric circuit is indicated to be in a safe state when the current leakage insulation value is larger than the insulation safety value. When the leakage insulation value starts to decrease, the electric circuit or the equipment can generate leakage at any time, and in order to realize the purpose of early warning, the invention is also provided with the display module 3, the state corresponding to the current leakage insulation value one by one is displayed in real time in the process of decreasing the leakage insulation value, and a worker can process the electric circuit or the equipment in advance according to the state displayed by the display module 3, so that the safety and the reliability of the leakage protection device are improved.
Specifically, when the leakage insulation value is recovered to be above the insulation safety value (namely, the electric circuit fault is removed), the leakage protection device provided by the invention can realize automatic reset, namely, the control module 2 controls the main switch of the electric circuit to be closed, so that the electric circuit or equipment is recovered to normally work, the efficiency is high, and meanwhile, the early warning of the display module 3 is released, so that the reliability and the safety of the leakage protection device provided by the invention are further improved.
The invention provides a leakage protection device, comprising: the acquisition module is used for acquiring the current leakage insulation value of the electric circuit; the control module is used for controlling the main switch of the electric circuit to be disconnected when the current leakage insulation value is smaller than or equal to the insulation safety value; the main switch is also used for controlling the main switch to be closed when the current leakage insulation value is larger than the insulation safety value; and the display module is used for displaying the state corresponding to the current leakage insulation value. Therefore, in practical application, the scheme of the invention is adopted, the leakage state of the electric circuit is displayed in real time through the display module, when the leakage insulation value is reduced, the display module can display the state corresponding to the current leakage insulation value in real time, so that the aim of early warning in advance is fulfilled, the safe use of the electric circuit is ensured, meanwhile, after the leakage insulation value is restored to the insulation safety value, the electric circuit can be automatically reset, the electric circuit is conducted, the early warning of the display module is relieved, and the reliability and the safety of the leakage protection are improved.
Referring to fig. 2, fig. 2 is a schematic structural diagram of another leakage protection device according to the present invention, wherein the leakage protection device is based on the above embodiment:
as a preferred embodiment, the control module 2 comprises: a setting unit 21 for setting a safety voltage corresponding to the insulation safety value;
an amplifying unit 22, configured to obtain a current leakage current according to the current leakage voltage and the safety voltage, and amplify the current leakage current according to a preset rule, so as to obtain a state current for triggering the protection unit 23;
a protection unit 23, configured to control the main switch to be turned off when the state current is greater than or equal to the action current; the main switch is also used for controlling the main switch to be closed when the state current is smaller than the action current, wherein the action current is a current corresponding to the insulation safety value;
the display module 3 is specifically configured to display a state corresponding to the state current.
It will be understood that the insulation safety value refers to a resistance value, and the safety voltage is a voltage value corresponding to the insulation safety value, where the safety voltage can be set by the setting unit 21, and in the process of decreasing the current leakage insulation value of the electrical circuit, the current leakage voltage will relatively increase, when the current leakage voltage increases to the safety voltage, that is, when the state current output by the amplifying unit 22 reaches the action current, it indicates that the current leakage insulation value has decreased to the insulation safety value or below, at this time, the protection unit 23 in the control module 2 controls the main switch to be opened, and correspondingly, when the current leakage insulation value increases, the current leakage voltage and the state current thereof will both decrease correspondingly, and when the current leakage insulation value decreases to below the safety value, the protection unit 23 controls the main switch to be closed, so as to realize automatic reset.
Referring to fig. 3, fig. 3 is a schematic structural diagram of another leakage protection device according to the present invention, wherein the leakage protection device is based on the above embodiment:
as a preferred embodiment, the amplifying unit 22 includes an operational amplifier OPA, a first resistor R1, a second resistor R2, a first capacitor C1, and a first transistor T1, wherein:
the in-phase input end of the operational amplifier OPA is connected with the output end of the setting unit 21, the inverting input end of the operational amplifier OPA is respectively connected with the output end of the acquisition module 1 and the first end of the first resistor R1, the second end of the first resistor R1 is connected with the first end of the first capacitor C1, the second end of the first capacitor C1 is respectively connected with the output end of the operational amplifier OPA and the first end of the second resistor R2, the second end of the second resistor R2 is connected with the base electrode of the first triode T1, the emitter electrode of the first triode T1 is grounded, and the collector electrode of the first triode T1 is respectively connected with the second end of the first capacitor C1, the protection unit 23, the display module 3 and the power supply.
As a preferred embodiment, the amplifying unit 22 further includes a second triode T2, a base electrode of the second triode T2 is connected to a collector electrode of the first triode T1, an emitter electrode of the second triode T2 is grounded, and the collector electrode of the second triode T2 is connected to the protection unit 23, the display module 3 and the power supply, respectively.
Specifically, the amplifying unit 22 provided by the present invention is an operational amplifying circuit with a compensation feedback function, and specifically includes an operational amplifier OPA, a first triode T1, a second triode T2, a first capacitor C1 (nonpolar capacitor), a first resistor R1, and a second resistor R2. The output end of the operational amplifier OPA is connected to the inverting input end thereof through a first capacitor C1 and a first resistor R1 to form a compensation feedback signal. The non-inverting input end of the operational amplifier OPA is connected with the safety voltage, the inverting input end of the operational amplifier OPA is connected with the current leakage voltage, the operational amplifier OPA is used for comparing the safety voltage with the current leakage voltage, and outputting corresponding current leakage current according to a comparison result, the current leakage current is converted into state current which is enough to trigger the protection unit 23 after being amplified by the two-stage triode, so that the conversion process from dangerous high voltage in an electric circuit to weak leakage current is realized, and finally, the current leakage current signal is amplified by the two-stage triode, so that the signal intensity can be increased, and the early warning effect and the safety performance of the invention are further enhanced.
The operational amplifier OPA can be a bipolar operational amplifier OP07 with low noise and non-chopping and zero stabilization, so that the reliability of the leakage protection device is further improved.
As a preferred embodiment, the protection unit 23 includes an action relay J1, a first end of the action relay J1 is connected to the base of the second triode T2, and a second end of the action relay J1 is connected to the collector of the second triode T2.
As a preferred embodiment, the display module 3 includes a third resistor R3 and a light emitting diode D0;
the first end of the third resistor R3 is connected with the base electrode of the second triode T2, the second end of the third resistor R3 is connected with the anode of the light emitting diode D0, and the cathode of the light emitting diode D0 is connected with the collector electrode of the second triode T2.
Specifically, the protection unit 23 mainly includes an action relay J1, where the action relay J1 is a current-type relay, and the display module 3 mainly includes a third resistor R3 and a light emitting diode D0. The LED D0 is connected with the third resistor R3 in series and then connected with the action relay J1 in parallel to the collector electrode of the second triode T2, the base electrode of the second triode T2 is gradually triggered along with the reduction of the current leakage insulation value, the LED D0 is gradually lightened, the action relay J1 is triggered after the current leakage insulation value is smaller than or equal to the insulation safety value, the main switch is disconnected through a pair of connected on points and a connected off point, so that the leakage protection is realized, and meanwhile, a worker can determine the reduction degree of the current leakage insulation value of an electric circuit according to the brightness change of the LED D0.
As a preferred embodiment, the acquisition module 1 is specifically configured to:
acquiring the current leakage voltage of an electric circuit;
and obtaining the current leakage insulation value according to the current leakage voltage.
As a preferred embodiment, the acquisition module 1 comprises a fourth resistor R4, a fifth resistor R5 and a first diode D1, wherein:
the first end of the fourth resistor R4 is connected with the electric circuit, the second end of the fourth resistor R4 is connected with the cathode of the first diode D1, the anode of the first diode D1 is connected with the first end of the fifth resistor R5, and the second end of the fifth resistor R5 is used as the output end of the acquisition module 1.
Specifically, considering that in practical application, the leakage protection device is directly connected to an electrical circuit, which is easy to cause circuit burnout, the acquisition module 1 acquires weak leakage current in the electrical circuit, and then the current leakage voltage is obtained through internal conversion of the acquisition module 1.
The acquisition module 1 comprises a high-power energy consumption resistor (namely a fourth resistor R4), a fifth resistor R5 and a first diode D1, wherein the cathode of the first diode D1 is connected into an electric circuit through the fourth resistor R4, and the anode of the first diode D1 is connected into the inverting input end of the operational amplifier OPA through the fifth resistor R5 to output a leakage sampling value, namely the current leakage voltage.
As a preferred embodiment, the setting unit 21 comprises an adjustable potentiometer W and a sixth resistor R6, wherein:
the first end of the adjustable potentiometer W is connected to the control end of the adjustable potentiometer W, the first end of the sixth resistor R6 and the power supply, the second end of the adjustable potentiometer W is grounded, and the second end of the sixth resistor R6 is used as the output end of the setting unit 21.
Specifically, the setting unit 21 is configured to set a safety voltage corresponding to an insulation safety value, and includes an adjustable potentiometer W and a sixth resistor R6, where after the adjustable potentiometer W and the sixth resistor R6 are connected in series, one end of the adjustable potentiometer W is connected to the in-phase input end of the operational amplifier OPA, and outputs the safety voltage, and the other end of the adjustable potentiometer W is connected to the equipment housing and the ground to form a common reference value.
Referring to fig. 4, fig. 4 is a schematic structural diagram of another leakage protection device according to the present invention, wherein the leakage protection device is based on the above embodiment:
as a preferred embodiment, the leakage protection device further comprises a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a second capacitor C2, a third capacitor C3, a second diode D2, a third diode D3, a fourth diode D4 and a fifth diode D5, wherein:
the first end of the seventh resistor R7 is respectively connected with the first end of the eighth resistor R8, the first end of the ninth resistor R9, the first end of the tenth resistor R10, the cathode of the fifth diode D5 and the power supply, the second end of the seventh resistor R7 is respectively connected with the anode of the first diode D1 and the cathode of the second diode D2, the second end of the eighth resistor R8 is connected with the first end of the adjustable potentiometer W, the anode of the second diode D2 is respectively connected with the first end of the second capacitor C2 and the ground, the first end of the second capacitor C2 is connected with the anode of the first diode D1, the cathode of the third diode D3 is respectively connected with the second end of the fifth resistor R5 and the anode of the fourth diode D4, the anode of the third diode D3 is respectively connected with the cathode of the fourth diode D4 and the second end of the sixth resistor R6, the second end of the ninth resistor R9 is connected with the second end of the first capacitor C1, the first end of the second resistor R10 is connected with the second end of the third diode D2, and the third base of the third resistor C2 is connected with the third end of the third diode D2.
Specifically, the leakage protection device provided by the invention further comprises a seventh resistor R7 and an eighth resistor R8 for voltage division, and the second capacitor C2, the third capacitor C3, the ninth resistor R9, the tenth resistor R10, the second diode D2, the third diode D3, the fourth diode D4 and the fifth diode D5 for realizing anti-interference and bypass protection are used for further enhancing the safety of the leakage protection device.
In summary, according to the leakage protection device provided by the invention, the safety voltage is set through the adjustable potentiometer W, the safety voltage value corresponds to the insulation safety value of the electric circuit, weak leakage current is gradually formed in the process of gradually reducing the leakage insulation value of the electric circuit, the weak leakage current is gradually amplified through the two-stage triode to form a state current value, the current state current value is gradually increased along with the gradual reduction of the current leakage insulation value, the light emitting diode D0 is gradually lightened, and when the current leakage insulation value of the electric circuit is reduced to the insulation safety value, the state current value triggers the action relay J1 to turn off the main switch. When the current leakage insulation value of the electric circuit is recovered to be higher than the insulation safety value, the action relay J1 is automatically reset, and the light emitting diode D0 is extinguished.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. An earth leakage protection device, comprising:
the acquisition module is used for acquiring the current leakage insulation value of the electric circuit;
the control module is used for controlling the main switch of the electric circuit to be disconnected when the current leakage insulation value is smaller than or equal to the insulation safety value; the main switch is also used for controlling the main switch to be closed when the current leakage insulation value is larger than the insulation safety value;
the display module is used for displaying the state corresponding to the current leakage insulation value;
the acquisition module is specifically configured to:
acquiring the current leakage voltage of the electric circuit;
obtaining a current leakage insulation value according to the current leakage voltage;
the control module includes:
a setting unit for setting a safety voltage corresponding to the insulation safety value;
the amplifying unit is used for obtaining the current leakage current according to the current leakage voltage and the safety voltage, amplifying the current leakage current according to a preset rule and obtaining a state current for triggering the protection unit;
the protection unit is used for controlling the main switch to be disconnected when the state current is greater than or equal to the action current; the main switch is further used for controlling the main switch to be closed when the state current is smaller than the action current, wherein the action current is a current corresponding to the insulation safety value;
the display module is specifically configured to display a state corresponding to the state current;
the amplifying unit comprises an operational amplifier, a first resistor, a second resistor, a first capacitor and a first triode, wherein:
the non-inverting input end of the operational amplifier is connected with the output end of the setting unit, the inverting input end of the operational amplifier is respectively connected with the output end of the acquisition module and the first end of the first resistor, the second end of the first resistor is connected with the first end of the first capacitor, the second end of the first capacitor is respectively connected with the output end of the operational amplifier and the first end of the second resistor, the second end of the second resistor is connected with the base electrode of the first triode, the emitter electrode of the first triode is grounded, and the collector electrode of the first triode is respectively connected with the second end of the first capacitor, the protection unit, the display module and the power supply;
the amplifying unit further comprises a second triode, wherein the base electrode of the second triode is connected with the collector electrode of the first triode, the emitting electrode of the second triode is grounded, and the collector electrode of the second triode is respectively connected with the protecting unit, the display module and the power supply.
2. The leakage protection device of claim 1, wherein the protection unit comprises an action relay having a first end connected to the base of the second transistor and a second end connected to the collector of the second transistor.
3. The leakage protection device of claim 1, wherein the display module comprises a third resistor and a light emitting diode;
the first end of the third resistor is connected with the base electrode of the second triode, the second end of the third resistor is connected with the anode of the light-emitting diode, and the cathode of the light-emitting diode is connected with the collector electrode of the second triode.
4. A leakage protection device according to any one of claims 1-3, wherein the acquisition module comprises a fourth resistor, a fifth resistor and a first diode, wherein:
the first end of the fourth resistor is connected with the electric circuit, the second end of the fourth resistor is connected with the cathode of the first diode, the anode of the first diode is connected with the first end of the fifth resistor, and the second end of the fifth resistor is used as the output end of the acquisition module.
5. The earth leakage protection device of claim 4, wherein the setting unit comprises an adjustable potentiometer and a sixth resistor, wherein:
the first end of the adjustable potentiometer is connected with the control end of the adjustable potentiometer, the first end of the sixth resistor and the power supply respectively, the second end of the adjustable potentiometer is grounded, and the second end of the sixth resistor is used as the output end of the setting unit.
6. The leakage protection device of claim 5, further comprising a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a second capacitor, a third capacitor, a second diode, a third diode, a fourth diode and a fifth diode, wherein:
the first end of the seventh resistor is respectively connected with the first end of the eighth resistor, the first end of the ninth resistor, the first end of the tenth resistor, the cathode of the fifth diode and the power supply, the second end of the seventh resistor is respectively connected with the anode of the first diode and the cathode of the second diode, the second end of the eighth resistor is connected with the first end of the adjustable potentiometer, the anode of the second diode is respectively connected with the first end of the second capacitor and the ground, the first end of the second capacitor is connected with the anode of the first diode, the cathode of the third diode is respectively connected with the second end of the fifth resistor and the anode of the fourth diode, the anode of the third diode is respectively connected with the cathode of the fourth diode and the second end of the sixth resistor, the second end of the ninth resistor is connected with the second end of the first capacitor, the first end of the second resistor is connected with the second base of the third diode is connected with the second end of the third diode, and the third resistor is connected with the third base of the third diode.
CN201811257482.3A 2018-10-26 2018-10-26 Leakage protection device Active CN109245041B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811257482.3A CN109245041B (en) 2018-10-26 2018-10-26 Leakage protection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811257482.3A CN109245041B (en) 2018-10-26 2018-10-26 Leakage protection device

Publications (2)

Publication Number Publication Date
CN109245041A CN109245041A (en) 2019-01-18
CN109245041B true CN109245041B (en) 2024-02-02

Family

ID=65082325

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811257482.3A Active CN109245041B (en) 2018-10-26 2018-10-26 Leakage protection device

Country Status (1)

Country Link
CN (1) CN109245041B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112242690A (en) * 2020-10-30 2021-01-19 山东乾立光电科技有限公司 Electric shock prevention device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105486923A (en) * 2014-10-02 2016-04-13 福特全球技术公司 Bus leakage resistance estimation for electrical isolation testing and diagnostics
CN205691645U (en) * 2016-05-26 2016-11-16 上海之立信息技术有限公司 A kind of signal detection system
CN209072045U (en) * 2018-10-26 2019-07-05 兖矿东华重工有限公司 A kind of earth leakage protective device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105486923A (en) * 2014-10-02 2016-04-13 福特全球技术公司 Bus leakage resistance estimation for electrical isolation testing and diagnostics
CN205691645U (en) * 2016-05-26 2016-11-16 上海之立信息技术有限公司 A kind of signal detection system
CN209072045U (en) * 2018-10-26 2019-07-05 兖矿东华重工有限公司 A kind of earth leakage protective device

Also Published As

Publication number Publication date
CN109245041A (en) 2019-01-18

Similar Documents

Publication Publication Date Title
CN107294058A (en) A kind of overvoltage undervoltage detection circuit applied to solar energy power accumulating power supply
CN104218558B (en) Anti-surging high tension protection circuit
CN109245041B (en) Leakage protection device
CN205752844U (en) There is the insert row of load priority management function
CN101877475B (en) Power supply short-circuit protection circuit
CN201604575U (en) Flasher circuit with current-limiting and voltage-limiting functions
CN204205568U (en) Switching Power Supply and short-circuit protection circuit thereof
CN209072045U (en) A kind of earth leakage protective device
US9312678B2 (en) Surge protection device
CN101566871B (en) USB protection device
CN204013413U (en) A kind of amplifier current foldback circuit
CN208386969U (en) A kind of LED car lamp constant-current circuit based on metal-oxide-semiconductor
CN203218857U (en) Overvoltage protection circuit
CN204992522U (en) Circuit protector
CN201733059U (en) Power supply short-circuit protection circuit
CN110071399A (en) A kind of intelligent socket with lightning protection function
CN220692815U (en) Overvoltage protection circuit
CN109066615B (en) Broken wire protector for two-core power line
CN113991601B (en) Output voltage short circuit protection circuit structure
CN203039337U (en) Low-power intrinsic safety grating
CN219937947U (en) Overcurrent protection circuit
CN102723692A (en) Overcurrent protection circuit with feedback
CN215647505U (en) Circuit for realizing short-circuit protection
CN203522174U (en) Lightning protection device for single-phase leakage switch
CN217282186U (en) Arc leakage overvoltage flashing lamp circuit

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant