CN108288848B - Electric leakage locking device for underground coal mine motor - Google Patents
Electric leakage locking device for underground coal mine motor Download PDFInfo
- Publication number
- CN108288848B CN108288848B CN201810193485.9A CN201810193485A CN108288848B CN 108288848 B CN108288848 B CN 108288848B CN 201810193485 A CN201810193485 A CN 201810193485A CN 108288848 B CN108288848 B CN 108288848B
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- China
- Prior art keywords
- contactor
- relay
- insulation resistance
- power supply
- controller
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- 239000003245 coal Substances 0.000 title claims abstract description 28
- 238000001514 detection method Methods 0.000 claims abstract description 56
- 238000009413 insulation Methods 0.000 claims abstract description 34
- 239000003990 capacitor Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 6
- 230000005465 channeling Effects 0.000 abstract 1
- 230000000903 blocking effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements
- H02H7/0844—Fail safe control, e.g. by comparing control signal and controlled current, isolating motor on commutation error
Landscapes
- Control Of Ac Motors In General (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides a leakage locking device of a coal mine underground motor, which comprises a controller, a relay, a contactor, an inductor L and a capacitor C, wherein the controller is connected with the relay; the controller is provided with a direct-current stabilized power supply, an insulation resistance detection module and a control module; the relay has a coil and contacts; the contactor is provided with a coil, a main contact and an auxiliary contact; the relay and the contactor are controlled by a controller; one end of the auxiliary contact of the contactor is electrically connected with the positive terminal of the direct-current stabilized power supply; the main contact of the contactor is connected in series on a three-phase power supply line of the motor; the other end of the auxiliary contact of the contactor, one end of the contact of the relay and one end of the capacitor C are collinear; the other end of the contact of the relay is electrically connected with one end of the inductor L; when the contactor is used, the other end of the inductor L is electrically connected with one phase of a three-phase power supply circuit of the motor at the rear end of the main contact of the contactor. The invention has simple structure and lower cost, and effectively solves the technical problem that the device is easy to burn out due to high pressure channeling.
Description
Technical Field
The invention relates to a coal mine motor control protection device, in particular to a coal mine underground motor leakage locking device.
Background
The leakage locking device is used for detecting and protecting leakage before the underground coal mine motor is started. The existing underground coal mine motor leakage locking device is shown in fig. 1: the device mainly comprises a controller, a contactor KM and a relay K, wherein the controller comprises a direct current stabilized power supply U0, an insulation resistance detection module and a control module; the insulation resistance of the main circuit including the motor after the main contact of the contactor to ground is denoted as R. When the electric leakage blocking detection device is used, the controller judges the insulation condition of a main loop of the motor M at the rear stage of the contactor by detecting the size of the resistor R, if the detection value of the resistor R is not smaller than a preset value, the main loop is good in insulation, the controller cuts off the electric leakage blocking detection function before the motor is started by controlling the contactor KM and the relay K, and inputs the electric leakage blocking detection function after the motor M is stopped, and the electric leakage blocking detection function is circulated; if the detection value of the resistor R is smaller than the preset value, the main loop insulation is not up to standard, and at the moment, the controller controls the contactor KM to inhibit closing so as to inhibit the motor M from being started again, so that leakage locking is realized, and the underground production safety of the coal mine is ensured.
The existing underground coal mine motor leakage locking device shown in fig. 1 has a problem which puzzles the industry in the use process: the leakage lock is often burned out by high voltage ingress. In order to solve the technical problem, the industry generally adopts the method that the leakage locking device is disconnected in advance and is put into delay, namely, before the motor M is started, the leakage locking detection function is disconnected; after the motor M is disconnected, the leakage locking detection function is put into operation for a period of time, namely in fig. 1, the relay K is disconnected before the main contact of the contactor KM is closed; after the contactor KM is opened, the relay K is closed in a delay mode. However, the methods currently adopted have the following technical problems: firstly, because of inertia when the motor M is stopped, if the delay time is up when the motor M is not completely stopped, the leakage locking device is put in, and the motor M becomes a generator at the moment to form counter electromotive force, and the generated high-voltage power is blown into the leakage locking device to burn out the leakage locking device; if the input time is prolonged, under the condition that the motor starting interval is short, the motor is started again without input of the leakage locking function, and the risk of leakage accidents is increased; in addition, the method of 'advanced disconnection and delayed input' cannot solve the technical problem that high-voltage electricity is blown into a burning device when the relay K for isolating high voltage is damaged.
Disclosure of Invention
The purpose of the invention is that: aiming at the problems in the prior art, the electric leakage locking device for the underground coal mine motor is simple in structure, low in cost and capable of effectively preventing high-voltage from being burnt out when in use.
The technical scheme of the invention is as follows: the invention relates to a coal mine underground motor leakage locking device, which comprises a controller, a relay K and a contactor KM, wherein the controller is provided with a direct current stabilized voltage supply U0, an insulation resistance detection module and a control module, and the direct current stabilized voltage supply U0 is provided with an anode terminal and a cathode terminal; the insulation resistance detection module is provided with a detection end, a grounding end and a detection signal output end; the control module is provided with a detection signal input end, a first control end and a second control end; the detection end of the insulation resistance detection module is electrically connected with the negative electrode wiring terminal of the direct current stabilized power supply U0; the detection signal input end of the control module is electrically connected with the detection signal output end of the insulation resistance detection module; the relay K is provided with a coil and contacts; the contactor KM is provided with a coil, a main contact and an auxiliary contact; the coil of the relay K and the coil of the contactor KM are respectively and electrically connected with a first control end and a second control end of a control module of the controller; one end of the auxiliary contact of the contactor KM is electrically connected with the positive terminal of the direct current stabilized power supply U0 of the controller; the main contact of the contactor KM is connected in series on a three-phase power supply line of the motor M; the method is characterized in that: the inductor L and the capacitor C are also included;
The other end of the auxiliary contact of the contactor KM, one end of the contact of the relay K and one end of the capacitor C are collinear; the other end of the contact of the relay K is electrically connected with one end of the inductor L; the other end of the capacitor C is grounded, and the grounding end of the insulation resistance detection module of the controller is grounded;
when the contactor is used, the other end of the inductor L is electrically connected with one phase of a three-phase power supply circuit of the motor M at the rear end of the main contact of the contactor KM.
The invention has the positive effects that: (1) According to the electric leakage locking device for the underground coal mine motor, on the basis of the existing electric leakage locking device, the amplitude of the fleeing high-voltage alternating current can be effectively and greatly reduced by adding the inductor and the capacitor, so that the fleeing high-voltage alternating current can be effectively prevented from being burnt out when the electric leakage locking device is used, and the difficult problem puzzled in the industry is well solved. (2) The underground coal mine motor leakage locking device has the advantages of low transformation cost, convenient use and stable performance. (3) After the electric leakage locking device of the underground coal mine motor is adopted, the 'advanced disconnection and time delay input' are not needed when the device of the same type in the prior art is used, so that the underground coal mine production is greatly facilitated.
Drawings
FIG. 1 is a schematic diagram of a circuit configuration of a prior art electric leakage blocking device for a coal mine downhole motor, and further illustrates an electrical connection relationship between the device and a main loop of the coal mine downhole motor when in use;
FIG. 2 is a schematic diagram of the circuit configuration of the present invention, and further illustrates the electrical connection between the circuit configuration and the main loop of the underground coal mine motor during use;
FIG. 3 is a schematic diagram of the device for detecting the leakage blocking value of the underground coal mine motor;
fig. 4 is a schematic diagram of the device of the present invention for preventing ac high voltage from being burned out during use.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
Example 1
Referring to fig. 2, the electric leakage locking device for the underground coal mine motor of the embodiment mainly comprises a controller, a relay K, a contactor KM, an inductor L and a capacitor C.
The controller is provided with a direct-current stabilized power supply U0, an insulation resistance detection module and a control module, wherein the direct-current stabilized power supply U0 is provided with an anode terminal and a cathode terminal; the insulation resistance detection module is provided with a detection end, a grounding end and a detection signal output end; the control module is provided with a detection signal input end, a first control end and a second control end; the detection end of the insulation resistance detection module is electrically connected with the negative electrode wiring terminal of the direct current stabilized power supply U0; the detection signal input end of the control module is electrically connected with the detection signal output end of the insulation resistance detection module.
The relay K is provided with a coil and contacts; the contactor KM is provided with a coil, a main contact and an auxiliary contact; the coil of the relay K and the coil of the contactor KM are respectively and electrically connected with a first control end and a second control end of a control module of the controller, and are controlled by the control module; one end of the auxiliary contact of the contactor KM is electrically connected with the positive terminal of the direct current stabilized power supply U0 of the controller; the other end of the auxiliary contact of the contactor KM, one end of the contact of the relay K and one end of the capacitor C are collinear; the other end of the contact of the relay K is electrically connected with one end of the inductor L; the other end of the capacitor C is grounded, and the grounding end of the insulation resistance detection module of the controller is grounded. When the underground coal mine motor leakage locking device is used, the main contact of the contactor KM is connected in series to a three-phase (U, V, W) power supply circuit of the motor M; the other end of the inductor L is electrically connected with one phase of a three-phase power supply circuit of the motor M at the rear end of the main contact of the contactor KM.
Referring to fig. 3 and 2, the working principle of the electric leakage locking device of the underground coal mine motor of the embodiment is briefly described as follows:
When the motor M is stopped, the current output by the positive electrode of the dc stabilized power supply U0 of the controller flows back to the negative electrode of the dc stabilized power supply U0 through the auxiliary contact of the contactor KM, the contact of the relay K, the inductor L (direct current), the insulation resistance R of the main circuit including the motor M, and the insulation resistance detection module, at this time, the capacitor C is stopped, no current flows through the insulation resistance detection module, the value of the current flowing through the insulation resistance detection module is detected, the voltage value of the dc stabilized power supply U0 is known, so that the value of the resistor R can be converted, the insulation resistance detection module sends the detected value of the resistor R to the control module, the judgment threshold value of the resistor R is built in the control module, if the detected value of the resistor R is not less than the threshold value, the insulation of the main circuit is good, the controller cuts off the leakage locking detection function by controlling the contactor KM and the relay K before the motor M is stopped, and the leakage locking detection function is put into circulation; if the detection value of the resistor R is smaller than the threshold value, the main loop insulation is not up to standard, at the moment, the controller controls the contactor KM to disconnect the main loop, the motor M is prohibited from being started again, and leakage locking is realized, so that the underground production safety of the coal mine is ensured. The controller and the controller are both in the prior art for the coordination control of the relay K and the contactor KM, and will not be described in detail.
Referring to fig. 4 and 2, the principle of the electric leakage blocking device for the underground coal mine motor, which can prevent the ac high voltage from being blown into and burned out when in use, is briefly described as follows:
After the underground coal mine motor leakage locking device is put into operation, the high-voltage alternating current power Us is assumed to be inserted, the inductance value of the inductance L is recorded as L, the capacitance value of the capacitance C is recorded as Cc, the alternating current voltage inserted by a leakage locking detection interface (namely, between the positive electrode of the direct current stabilized power U0 and the grounding end of the insulation resistance detection module) is recorded as Uc, and the amplitude of the Uc is calculated By selection of the values of Ll and Cc, one can make/>Thereby making/>That is, the amplitude of the high-voltage alternating current can be effectively and greatly reduced, so that the leakage blocking device of the underground coal mine motor can be effectively prevented from being burnt out by the high-voltage alternating current when the leakage blocking device is used.
The above embodiments are illustrative of the specific embodiments of the present invention, and not restrictive, and various changes and modifications may be made by those skilled in the relevant art without departing from the spirit and scope of the invention, and all such equivalent technical solutions are intended to be included in the scope of the invention.
Claims (1)
1. The underground coal mine motor leakage locking device comprises a controller, a relay K and a contactor KM, wherein the controller is provided with a direct current stabilized voltage supply U0, an insulation resistance detection module and a control module, and the direct current stabilized voltage supply U0 is provided with an anode terminal and a cathode terminal; the insulation resistance detection module is provided with a detection end, a grounding end and a detection signal output end; the control module is provided with a detection signal input end, a first control end and a second control end; the detection end of the insulation resistance detection module is electrically connected with the negative electrode wiring terminal of the direct-current stabilized power supply U0; the detection signal input end of the control module is electrically connected with the detection signal output end of the insulation resistance detection module; the relay K is provided with a coil and contacts; the contactor KM is provided with a coil, a main contact and an auxiliary contact; the coil of the relay K and the coil of the contactor KM are respectively and electrically connected with a first control end and a second control end of a control module of the controller; one end of the auxiliary contact of the contactor KM is electrically connected with the positive terminal of the direct current stabilized power supply U0 of the controller; the main contact of the contactor KM is connected in series on a three-phase power supply line of the motor M; the method is characterized in that: the inductor L and the capacitor C are also included;
The other end of the auxiliary contact of the contactor KM, one end of the contact of the relay K and one end of the capacitor C are collinear; the other end of the contact of the relay K is electrically connected with one end of the inductor L; the other end of the capacitor C is grounded, and the grounding end of the insulation resistance detection module of the controller is grounded;
When the contactor is used, the other end of the inductor L is electrically connected with one phase of a three-phase power supply circuit of the motor M at the rear end of the main contact of the contactor KM; the insulation resistance detection module is used for detecting the flowing current value, and the voltage value of the direct-current stabilized power supply U0 is known, so that the value of the insulation resistance R can be converted, and the insulation resistance detection module is used for sending the detected value of the insulation resistance R to the control module;
after the underground coal mine motor leakage locking device is put into operation, a high-voltage alternating current power supply which is used for entering is set as Us, the inductance value of the inductance L is recorded as L l, the capacitance value of the capacitance C is recorded as C c, the alternating current voltage which is used for entering and entering a leakage locking detection interface formed by the positive electrode of the direct current stabilized power supply U0 and the grounding end of the insulation resistance detection module is recorded as Uc, and the amplitude of the Uc is calculated By selection of the values of L l and C c, > ω 2LlCc > >1 can be made such that |Uc| < <|us|.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810193485.9A CN108288848B (en) | 2018-03-09 | 2018-03-09 | Electric leakage locking device for underground coal mine motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810193485.9A CN108288848B (en) | 2018-03-09 | 2018-03-09 | Electric leakage locking device for underground coal mine motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108288848A CN108288848A (en) | 2018-07-17 |
| CN108288848B true CN108288848B (en) | 2024-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810193485.9A Active CN108288848B (en) | 2018-03-09 | 2018-03-09 | Electric leakage locking device for underground coal mine motor |
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| CN108288848A (en) | 2018-07-17 |
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