CN109599831B - Low-load current automatic detection leakage protector - Google Patents
Low-load current automatic detection leakage protector Download PDFInfo
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- CN109599831B CN109599831B CN201910030706.5A CN201910030706A CN109599831B CN 109599831 B CN109599831 B CN 109599831B CN 201910030706 A CN201910030706 A CN 201910030706A CN 109599831 B CN109599831 B CN 109599831B
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- 238000001514 detection method Methods 0.000 title claims abstract description 100
- 230000001012 protector Effects 0.000 title claims abstract description 31
- 239000003990 capacitor Substances 0.000 claims description 12
- 230000000007 visual effect Effects 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000001960 triggered effect Effects 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims 1
- 230000005611 electricity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
Classifications
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a leakage protector for automatically detecting low load current, which comprises a zero sequence current transformer TA1 sleeved on a phase line and a zero line, wherein the load side of the zero sequence current transformer TA1 is sequentially connected with a phase line current transformer TA2 and a main switch KM1, the phase line of the zero sequence current transformer TA1 is connected with a current limiting resistor assembly, an automatic detection switch is connected between the current limiting resistor assembly and the zero line on the load side of the zero sequence current transformer TA1, the output end of a secondary coil of the zero sequence current transformer TA1 is sequentially connected with a zero sequence current signal processor and a controller, a timer module for timing automatic detection and timing and non-tripping timing of the main switch KM1 is arranged in or connected with the controller, and the controller is connected with a phase line current signal processor connected with the phase line current transformer TA2, an automatic detection switch driver for driving the on-off of the automatic detection switch and a switching-on-off device for driving the on-off of the main switch KM 1.
Description
[ Technical field ]
The invention relates to a leakage protector for automatically detecting low load current.
[ Background Art ]
Electrical disasters caused by improper electricity consumption or line leakage occur in daily production and life, and immeasurable casualties and property loss are caused. The installation of the leakage protector in the low-voltage distribution system is an effective measure for avoiding electric fire and electric equipment damage accidents caused by personal electric shock casualties and leakage. The electric installation regulations in most countries require periodic detection of the performance of the protector, and the electric safety regulations in China require detection of the leakage protector at least once every month to verify whether the leakage protection function is normal. But more than 90% of users do not detect regularly on demand, their risk is not underestimated.
[ Summary of the invention ]
The invention overcomes the defects of the technology and provides the leakage protector for automatically detecting the low-load current.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the leakage protector comprises a zero sequence current transformer TA1 sleeved on a phase line and a zero line, wherein a main switch KM1 for controlling the on-off of the phase line and the zero line is connected to the load side of the zero sequence current transformer TA1, a phase line current transformer TA2 for detecting load current is connected to the phase line between the load side of the zero sequence current transformer TA1 and the main switch KM1, a current limiting resistor assembly 1 is connected to the phase line on the power supply side of the zero sequence current transformer TA1, an automatic detection switch 2 is connected to the current limiting resistor assembly 1, the other end of the automatic detection switch 2 is connected with the zero line on the load side of the zero sequence current transformer TA1, a zero sequence current signal processor 4 and a controller 5 are sequentially connected to the output end of a secondary coil of the zero sequence current transformer TA1, a timer module 12 for timing automatic detection timing and main switch KM1 non-tripping timing is arranged in the controller 5, and the controller 5 is connected with an automatic detection switch TA 6 for driving the on-off of the phase line current transformer TA2, and a driver 7 for driving the automatic detection switch TA2, and a driver for driving the on-off driver for the main switch 8; each time the manual handle is operated to close the main switch KM1 to start power consumption, the timer module 12 starts timing automatic detection and timing, after timing reaches the set time, the load current detected by the phase line current transformer TA2 is greater than or equal to the load current set value, then continuous monitoring is carried out, until the load current is reduced to be smaller than the set value, the controller 5 controls the automatic detection switch driver 7 to drive the automatic detection switch 2 to be closed, at the moment, the zero sequence current transformer TA1 outputs a residual zero sequence current controller 5 to output a tripping signal, the switching-on and switching-off device 8 controls the contacts of the main switch KM1 to be opened, then the controller 5 controls the automatic detection switch driver 7 to drive the automatic detection switch 2 to be opened, then a switching-on signal is outputted to enable the switching-on and switching-off device 8 to control the contacts of the main switch KM1 to be closed, and the timer module 12 restarts timing detection and timing to continue power consumption.
The controller 5 is connected with a load voltage detector 9 for detecting the on-off state of the main switch KM1, and an audible and visual alarm 11 for audible and visual alarm when the main switch KM1 is not broken and the load voltage detector 9 detects that the load has voltage.
The current limiting resistor assembly 1 is connected with a ground wire current switch 3 for switching off and electrifying the superior leakage protector, the other end of the ground wire current switch 3 is connected with a ground wire, and the controller 5 is connected with a ground wire current switch driver 10 for driving the ground wire current switch 3 to be switched on and off.
The controller 5 is connected with a value setting device 13 for setting the timer module 12 timing automatic detection time and the main switch KM1 non-tripping time and setting the timing automatic detection minimum load current value.
The power supply side phase line of the main switch KM1 is connected with a power supply circuit 14 for supplying power to the controller 5.
A manual detection switch SB which is triggered to generate zero sequence current by the zero sequence current transformer TA1 during manual detection is arranged between the current limiting resistor assembly 1 and the zero line at the load side of the zero sequence current transformer TA 1.
The current limiting resistor assembly 1 comprises a resistor R1 and a resistor R2, one end of the resistor R1 is connected with a power side phase line of the zero sequence current transformer TA1, the other end of the resistor R1 is respectively connected with one end of the resistor R2 and the ground wire current switch 3, and the other end of the resistor R2 is respectively connected with the automatic detection switch 2 and the manual detection switch SB.
The current limiting resistor assembly 1 comprises a resistor R1 and a resistor R2, one end of the resistor R1 and one end of the resistor R2 are respectively connected with a power supply side phase line of the zero sequence current transformer TA1, the other end of the resistor R1 is respectively connected with the automatic detection switch 2 and the manual detection switch SB, and the other end of the resistor R2 is connected with the ground wire current switch 3.
The automatic detection switch 2 is a mechanical switch KM2 driven by an automatic detection switch driver 7, and the ground current switch 3 is a mechanical switch KM3 driven by a ground current switch driver 10.
The automatic detection switch 2 is a thyristor Q1, the positive end of the thyristor Q1 is connected with a resistor R1, the negative end of the thyristor Q1 is respectively connected with a zero line on the load side of the zero sequence current transformer TA1 and one end of a capacitor C1, the other end of the capacitor C1 is respectively connected with the gate end of the thyristor Q1 and the automatic detection switch driver 7, the ground wire current switch 3 is a thyristor Q2, the positive end of the thyristor Q2 is connected with a resistor R2, the negative end of the thyristor Q2 is respectively connected with the ground wire and one end of a capacitor C2, and the other end of the capacitor C2 is respectively connected with the gate end of the thyristor Q2 and the ground wire current switch driver 10.
The beneficial effects of the invention are as follows:
1. The invention can automatically detect whether the on-off device of the leakage protector is normal or not when the load is small or zero after the set time is up, not only can realize the self-detection of the on-off with tripping, but also can prevent the main switch contact from being burnt out by heavy current when the self-detection frequently trips and closes.
2. The invention has simple structure, long service life, easy manufacture and low cost.
[ Description of the drawings ]
FIG. 1 is a schematic diagram of a structure of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a second embodiment of the present invention;
fig. 3 is a schematic diagram of a third structure of an embodiment of the present invention.
In the figure, the power line symbol illustrates: l is a phase line, N is a zero line, and PE is a ground line.
Detailed description of the preferred embodiments
The technical solutions of the embodiments of the present invention will be explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the examples in the implementation manner, other examples obtained by a person skilled in the art without making creative efforts fall within the protection scope of the present invention.
Embodiment one:
As shown in fig. 1, a leakage protector for automatically detecting low load current includes a zero sequence current transformer TA1 sleeved on a phase line and a zero line, a main switch KM1 for controlling on-off of the phase line and the zero line is connected to a load side of the zero sequence current transformer TA1, and the leakage protector is characterized in that: the zero sequence current transformer TA1 is characterized in that a phase line between the load side of the zero sequence current transformer TA1 and the main switch KM1 is connected with a phase line current transformer TA2 for detecting load current, a phase line at the power supply side of the zero sequence current transformer TA1 is connected with a current limiting resistor assembly 1, the current limiting resistor assembly 1 is connected with an automatic detection switch 2 for automatically detecting low load current, the other end of the automatic detection switch 2 is connected with a zero line at the load side of the zero sequence current transformer TA1, a zero sequence current signal processor 4 and a controller 5 are sequentially connected to the output end of a secondary coil of the zero sequence current transformer TA1, a timer module 12 for timing automatic detection and timing and non-tripping timing of the main switch KM1 is arranged in or connected to the controller 5, and the controller 5 is connected with a phase line current signal processor 6 connected with the phase line current transformer TA2, an automatic detection switch driver 7 for driving the on-off of the automatic detection switch 2 and a switching-off device 8 for driving the on-off of the main switch KM 1.
The controller 5 is connected with a load voltage detector 9 for detecting the on-off state of the main switch KM1, and an audible and visual alarm 11 for performing audible and visual alarm when the load voltage detector 9 detects that the load has voltage when the main switch KM1 is not jumped off.
The current limiting resistor assembly 1 is connected with a ground wire current switch 3 for switching off and electrifying the superior leakage protector, the other end of the ground wire current switch 3 is connected with a ground wire, and the controller 5 is connected with a ground wire current switch driver 10 for driving the ground wire current switch 3 to be switched on and off.
A manual detection switch SB which is triggered to generate zero sequence current by the zero sequence current transformer TA1 during manual detection is arranged between the current limiting resistor assembly 1 and the zero line at the load side of the zero sequence current transformer TA 1.
The current limiting resistor assembly 1 comprises a resistor R1 and a resistor R2, one end of the resistor R1 is connected with a power side phase line of the zero sequence current transformer TA1, the other end of the resistor R1 is respectively connected with one end of the resistor R2 and the ground wire current switch 3, and the other end of the resistor R2 is respectively connected with the automatic detection switch 2 and the manual detection switch SB.
The automatic detection switch 2 is a mechanical switch KM2 driven by an automatic detection switch driver 7, and the ground current switch 3 is a mechanical switch KM3 driven by a ground current switch driver 10.
Each time the manual handle is operated to close the main switch KM1, a user starts to use electricity, meanwhile, the timer 12 starts to time the automatic detection, after the time reaches the set time, the load current detected by the phase line current transformer TA2 is processed by the phase line current signal processor 6, the load current value output to the controller 5 is greater than or equal to the load current set value, the set value can be 0, monitoring is continued until the load current is reduced to be smaller than the set value, the controller 5 controls the automatic detection switch driver 7 to drive the mechanical switch KM2 to be closed, at the moment, the zero sequence current transformer TA1 outputs the residual zero sequence current to be processed by the zero sequence current signal processor 4 and then outputs a trigger signal to the controller 5, the controller 5 outputs a tripping signal to enable the switching-on/off device 8 to control the main switch KM1 to be opened, at the moment, the load voltage detector 9 outputs a no voltage signal to the controller 5, namely, the electric leakage protector is indicated to trip normally, then the controller 5 controls the automatic detection switch driver 7 to drive the mechanical switch KM2 to be opened, then the switching-on device 8 controls the main switch KM1 to be closed, at the moment, the load voltage detector 9 outputs a voltage signal to the controller 5 to detect the residual zero sequence current, after the zero sequence current is processed by the zero sequence current signal processor 4, the timer is reset, the automatic detection of the user can be started, or the automatic timer can be reset, and the automatic detection of the current can be realized, and the automatic timer can be continued when the timer is used for detecting current or is restarted.
If a fault occurs, the contact of the main switch KM1 is not disconnected and still is in a closing state, the load voltage detector 9 outputs a voltage signal to the controller 5 to indicate that the leakage protector works abnormally, at the moment, the controller 5 controls the audible and visual alarm 11 to send out an audible and visual alarm signal, and the timer 12 starts to count when the main switch KM1 is not tripped; after the set time is counted, the main switch KM1 still does not trip, the load voltage detector 9 still detects that a voltage signal is output, the controller 5 controls the switch driver 7 to drive the mechanical switch KM2 to be opened, and controls the ground wire current switch driver 10 to drive the mechanical switch KM3 to be closed, so that current flows from the phase line L to the ground wire PE through the current limiting resistor R1, and the upper-level leakage protector trips, thereby ensuring the electricity utilization safety.
The user can also realize manual detection through manual detection switch SB, press manual detection switch SB, electric shock switch-on, the surplus zero sequence current that zero sequence current transformer TA1 output is through zero sequence current signal processor 4 processing back, to controller 5 output trigger signal, controller 5 output trip signal makes and closes the switching-off device 8 control main switch KM1 contact disconnection, the timing detection timing of timer 12 resets, thereby realize the manual detection to earth leakage protector, loosen the button after the manual detection is accomplished, manual detection switch SB contact disconnection, operate manual handle and close main switch KM1, timer 12 begins timing detection timing, the user can continue the power consumption.
The controller 5 is connected to a value setting unit 13 for setting the timer 12 timing automatic detection time and the main switch KM1 no-trip time, and setting the timing automatic detection minimum load current value, and the timing automatic detection time of the timer 12, the main switch KM1 no-trip time and the timing automatic detection minimum load current value can be set to 0 by the value setting unit 13, respectively.
The power supply side phase line of the main switch KM1 is connected with a power supply circuit 14 for supplying power to the controller 5.
Embodiment two:
As shown in fig. 2, the current limiting resistor assembly 1 includes a resistor R1 and a resistor R2, one end of the resistor R1 and one end of the resistor R2 are respectively connected with a power supply side phase line of the zero sequence current transformer TA1, the other end of the resistor R1 is respectively connected with an automatic detection switch 2 and a manual detection switch SB, and the other end of the resistor R2 is connected with a ground wire current switch 3.
The automatic detection switch 2 is a mechanical switch KM2 driven by an automatic detection switch driver 7, and the ground current switch 3 is a mechanical switch KM3 driven by a ground current switch driver 10.
The difference between the second embodiment and the first embodiment is that the connection modes of the resistors R1 and R2 in the current limiting resistor assembly 1 are different, and the fault of the resistor R1 in the second embodiment does not influence the tripping function of the upper-level leakage protector, so that the electricity safety is further ensured.
Embodiment III:
as shown in fig. 3, the current limiting resistor assembly 1 includes a resistor R1 and a resistor R2, one end of the resistor R1 and one end of the resistor R2 are respectively connected with a power supply side phase line of the zero sequence current transformer TA1, the other end of the resistor R1 is respectively connected with an automatic detection switch 2 and a manual detection switch SB, and the other end of the resistor R2 is connected with a ground wire current switch 3.
The automatic detection switch 2 is a thyristor Q1, the positive end of the thyristor Q1 is connected with a resistor R1, the negative end of the thyristor Q1 is respectively connected with a zero line on the load side of the zero sequence current transformer TA1 and one end of a capacitor C1, the other end of the capacitor C1 is respectively connected with the gate end of the thyristor Q1 and the automatic detection switch driver 7, the ground wire current switch 3 is a thyristor Q2, the positive end of the thyristor Q2 is connected with a resistor R2, the negative end of the thyristor Q2 is respectively connected with the ground wire and one end of a capacitor C2, and the other end of the capacitor C2 is respectively connected with the gate end of the thyristor Q2 and the ground wire current switch driver 10.
The difference between the third embodiment and the second embodiment is that the triggering conduction of the thyristor Q1 and the thyristor Q2 is used for respectively replacing the closed conduction of the contacts of the relay mechanical switch KM2 and the relay mechanical switch KM3, so that the influence of the frequent on-off of the mechanical contacts on the service life can be prevented.
The invention can be applied to equipment related to single-phase and three-phase power supplies, such as a track-type leakage protector, a power socket or power strip with leakage protection, a mobile power socket or power strip with leakage protection, a power plug socket or power strip converter with leakage protection and the like, and is not only limited in this description, but also the invention is applied to the leakage protection of related power supplies.
Claims (10)
1. The utility model provides a low load current automated inspection's earth leakage protector, establishes the zero sequence current transformer TA1 on phase line and zero line including the cover, zero sequence current transformer TA1 load side is connected with the main switch KM1 of control phase line and zero line break-make, its characterized in that: the zero sequence current transformer TA1 load side and the phase line between the main switch KM1 are connected with a phase line current transformer TA2 for detecting load current, the phase line at the power supply side of the zero sequence current transformer TA1 is connected with a current limiting resistor assembly (1), the current limiting resistor assembly (1) is connected with an automatic detection switch (2), the other end of the automatic detection switch (2) is connected with the zero line at the load side of the zero sequence current transformer TA1, the secondary coil output end of the zero sequence current transformer TA1 is sequentially connected with a zero sequence current signal processor (4) and a controller (5), the controller (5) is internally provided with or connected with a timer module (12) for timing automatic detection timing and main switch KM1 trip-free timing, and the controller (5) is connected with a phase line current signal processor (6) connected with the phase line current transformer TA2, an automatic detection switch driver (7) for driving the on-off of the automatic detection switch KM 2 and a switching-on-off switching-off device (8) for driving the main switch KM 1; the automatic detection device is characterized in that each time the manual handle is operated to close the main switch KM1 to start power consumption, the timer module (12) starts timing automatic detection and timing, after timing reaches a set time, load current detected by the phase line current transformer TA2 is larger than or equal to a load current set value, monitoring is continued until the load current is reduced to be smaller than the set value, the controller (5) controls the automatic detection switch driver (7) to drive the automatic detection switch (2) to be closed, at the moment, the zero sequence current transformer TA1 outputs a residual zero sequence current controller (5) to output a tripping signal, the switching-on and switching-off device (8) controls the main switch KM1 to be opened, then the controller (5) controls the automatic detection switch driver (7) to drive the automatic detection switch (2) to be opened, and then a switching-on signal is outputted to enable the switching-off and switching-off device (8) to control the main switch KM1 to be closed, and the timer module (12) restarts timing detection and timing to continue power consumption.
2. The automatic low load current detection leakage protector according to claim 1, wherein: the controller (5) is connected with a load voltage detector (9) for detecting the on-off state of the main switch KM1, and an audible and visual alarm (11) for audible and visual alarm when the main switch KM1 is not jumped off and the load voltage detector (9) detects that the load has voltage.
3. The automatic low load current detection leakage protector according to claim 1, wherein: the current limiting resistor assembly (1) is connected with a ground wire current switch (3) for switching off and electrifying the superior leakage protector, the other end of the ground wire current switch (3) is connected with a ground wire, and the controller (5) is connected with a ground wire current switch driver (10) for driving the ground wire current switch (3) to be switched on and off.
4. A low load current auto-detecting leakage protector according to claim 3 wherein: the controller (5) is connected with a numerical value setting device (13) for setting the timing automatic detection time of the timer module (12) and the tripping time of the main switch KM1 and setting the timing automatic detection minimum load current value.
5. The automatic low load current detection leakage protector according to claim 1, wherein: the main switch KM1 is connected with a power supply circuit (14) for supplying power to the controller (5) through a power supply side phase line.
6. The automatic low load current detection leakage protector according to claim 1, wherein: a manual detection switch SB which is triggered to enable the zero sequence current transformer TA1 to generate zero sequence current during manual detection is arranged between the current limiting resistor assembly (1) and a zero line at the load side of the zero sequence current transformer TA 1.
7. The automatic low load current detection leakage protector according to claim 6, wherein: the current limiting resistor assembly (1) comprises a resistor R1 and a resistor R2, one end of the resistor R1 is connected with a power supply side phase line of the zero sequence current transformer TA1, the other end of the resistor R1 is respectively connected with one end of the resistor R2 and the ground wire current switch (3), and the other end of the resistor R2 is respectively connected with the automatic detection switch (2) and the manual detection switch SB.
8. The automatic low load current detection leakage protector according to claim 6, wherein: the current limiting resistor assembly (1) comprises a resistor R1 and a resistor R2, one end of the resistor R1 is connected with a power side phase line of the zero sequence current transformer TA1 respectively, the other end of the resistor R1 is connected with the automatic detection switch (2) and the manual detection switch SB respectively, and the other end of the resistor R2 is connected with the ground wire current switch (3).
9. A low load current auto-detecting leakage protector according to claim 7 or 8, characterized in that: the automatic detection switch (2) is a mechanical switch KM2 driven by an automatic detection switch driver (7), and the ground wire current switch (3) is a mechanical switch KM3 driven by a ground wire current switch driver (10).
10. The automatic low load current detection leakage protector according to claim 8, wherein: the automatic detection switch (2) is a thyristor Q1, the positive end of the thyristor Q1 is connected with a resistor R1, the negative end of the thyristor Q1 is respectively connected with a zero line on the load side of a zero sequence current transformer TA1 and one end of a capacitor C1, the other end of the capacitor C1 is respectively connected with the gate end of the thyristor Q1 and an automatic detection switch driver (7), the ground wire current switch (3) is a thyristor Q2, the positive end of the thyristor Q2 is connected with a resistor R2, the negative end of the thyristor Q2 is respectively connected with a ground wire and one end of a capacitor C2, and the other end of the capacitor C2 is respectively connected with the gate end of the thyristor Q2 and a ground wire current switch driver (10).
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| CN118174240B (en) * | 2024-04-08 | 2024-07-19 | 国网湖北省电力有限公司 | Emergency protection device for leakage of switch cabinet |
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| KR101247208B1 (en) * | 2012-08-07 | 2013-03-26 | 엠티엔시 (주) | Earth leakage breaker |
| CN107147072B (en) * | 2017-05-27 | 2019-06-04 | 东莞市兆南电子电器科技有限公司 | Electric leakage over current high-temperature protection circuit |
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