CN211859935U - Protection circuit of combined switch of fully mechanized coal mining face - Google Patents
Protection circuit of combined switch of fully mechanized coal mining face Download PDFInfo
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- CN211859935U CN211859935U CN202020941130.6U CN202020941130U CN211859935U CN 211859935 U CN211859935 U CN 211859935U CN 202020941130 U CN202020941130 U CN 202020941130U CN 211859935 U CN211859935 U CN 211859935U
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Abstract
The utility model discloses a protection circuit of a combined switch of a fully mechanized mining face, which comprises a protector, a transformer, a third fuse and a first capacitor, the input end of the protector is connected with a power supply, the output end of the protector is connected with the primary side of the transformer, the dotted terminal of the secondary side of the transformer is connected with one end of a third fuse, the other end of the third fuse is connected with one end of a first capacitor, the other end of the first capacitor is connected with the dotted terminal of the secondary side of the transformer and one end of a second inductor, one end of the first inductor is connected with one end of a second capacitor, the second capacitor is connected with the other end of the second inductor through the third capacitor, the joint of the second capacitor and the third capacitor is grounded, one end of the load is connected with one end of the first inductor through a first switch, and the other end of the load is connected with the other end of the second inductor through a second switch; the utility model has the advantages that: high-frequency harmonic interference is filtered, and damage to the combined switch protector of the fully mechanized coal mining face is avoided.
Description
Technical Field
The utility model relates to a colliery electromechanical field, more specifically relates to a combine and adopt protection circuit of working face combination switch.
Background
Along with the development of science and technology, the high-voltage high-power frequency converter is popularized and used on a fully mechanized mining face conveyor, the problem of high-frequency harmonic interference generated by the frequency converter is increasingly highlighted, the main performance is that a combined switch protector is often damaged, safety production is directly influenced, equipment cost investment is increased, and the fault reason is mainly caused by harmonic waves through field repeated measurement and analysis. Due to the fact that the frequency converter is additionally arranged in the power grid, when the frequency converter works, high-order harmonics are generated and enter a switch main loop through power grid coupling, then enter a control transformer T in a control loop, and are coupled to the secondary side of the control transformer T and a transformer T1 to a protector module again, and therefore electronic elements on a protector are broken down.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that prior art combines the fragile problem of adopting working face combination switch protector.
The utility model discloses a following technical means realizes solving above-mentioned technical problem: the protection circuit of the combined switch of the fully mechanized mining face comprises a protector, a transformer, a third fuse, a first capacitor, a first inductor, a second capacitor, a third capacitor and a load, wherein the input end of the protector is connected with a power supply, the output end of the protector is connected with the primary side of the transformer, the dotted terminal of the secondary side of the transformer is connected with one end of the third fuse, the other end of the third fuse is connected with one end of the first capacitor, the other end of the first capacitor is connected with the synonym end of the secondary side of the transformer and one end of the second inductor, one end of the first inductor is connected with one end of the second capacitor, the second capacitor is connected with the other end of the second inductor through the third capacitor, the joint of the second capacitor and the third capacitor is grounded, one end of the load is connected with one end of the first inductor through the first switch, and the other end of the load is connected with the other.
The utility model discloses a filter circuit is constituteed to first electric capacity, first inductance, second electric capacity and third electric capacity, and transformer secondary side connects filter circuit, combines through the filter circuit filtering to adopt the high frequency harmonic interference that the working face converter produced, avoids causing to combine to adopt working face combination switch excessive pressure and damages the electronic component of protector, improves to combine to adopt the life of working face combination switch protector.
Preferably, the load comprises a first diode, a second diode, a third diode, a fourth diode, a relay, an interference suppressor and a resistor which are numbered sequentially, the relay comprises a coil, a normally open contact and a normally closed contact, the anode of the first diode is connected with the first switch through the normally closed contact, the cathode of the second diode is connected with a connecting line of the normally closed contact and the first switch, the cathode of the third diode is connected with the cathode of the first diode, the anode of the third diode is connected with the cathode of the fourth diode, the anode of the fourth diode is connected with the anode of the second diode, one end of the second switch is connected with the other end of the second inductor, the other end of the second switch is connected with a connecting line of the third diode and the fourth diode, one end of the resistor is connected with the cathode of the third diode, the other end of the resistor is connected with one end of the coil, the normally open contact is connected in parallel with two ends of the, the interference suppressors are connected in parallel at two ends of the coil.
Preferably, the interference suppressor is P-A220-16-S4T 4.
Preferably, the protector comprises a first fuse and a second fuse, one end of the first fuse is connected with one end of the power supply, one end of the second fuse is connected with the other end of the power supply, the other end of the first fuse is connected with the dotted end of the primary side of the transformer, and the other end of the second fuse is connected with the different-name end of the primary side of the transformer.
The utility model has the advantages that:
(1) the utility model discloses a filter circuit is constituteed to first electric capacity, first inductance, second electric capacity and third electric capacity, and transformer secondary side connects filter circuit, combines through the filter circuit filtering to adopt the high frequency harmonic interference that the working face converter produced, avoids causing to combine to adopt working face combination switch excessive pressure and damages the electronic component of protector, improves to combine to adopt the life of working face combination switch protector.
(2) The load circuit is added into the anti-interference suppressor, harmonic generated in operation is prevented from interfering other electronic devices, meanwhile, the input voltage plays a balance role when being changed, and a fuse in the interference suppressor is fused when short circuit or fault occurs, so that a protection effect is achieved.
Drawings
Fig. 1 is a schematic diagram of a protection circuit of a combined switch of a fully mechanized mining face according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an implementation manner of a load in a protection circuit of a combined mining face switch according to an embodiment of the present invention.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, the protection circuit of the combined switch of the fully mechanized mining face comprises a protector, a transformer T, a third fuse FS3, a first capacitor C1, a first inductor L1, a second inductor L2, a second capacitor C2, a third capacitor C3 and a load, wherein the protector comprises a first fuse FS1 and a second fuse FS 2.
One end of the first fuse FS1 is connected with one end of the power supply, one end of the second fuse FS2 is connected with the other end of the power supply, the other end of the first fuse FS1 is connected with the dotted terminal of the primary side of the transformer T, and the other end of the second fuse FS2 is connected with the different-dotted terminal of the primary side of the transformer T. The dotted terminal of the secondary side of the transformer T is connected to one end of a third fuse FS3, the other end of the third fuse FS3 is connected to one end of a first capacitor C1, the other end of the first capacitor C1 is connected to the dotted terminal of the secondary side of the transformer T and one end of a second inductor L2, one end of a first inductor L1 is connected to one end of a second capacitor C2, the second capacitor C2 is connected to the other end of a second inductor L2 through a third capacitor C3, the connection between the second capacitor C2 and the third capacitor C3 is grounded, one end of a load is connected to one end of a first inductor L1 through a first switch K1, and the other end of the load is connected to the other end of a second inductor L2 through a second switch K2.
Referring to fig. 2, the load includes a first diode D1 to a fourth diode D4, a relay, an interference suppressor U1 and a resistor R, which are numbered in sequence, the relay includes a coil KJ1, a normally open contact KJ2 and a normally closed contact KJ3, an anode of the first diode D1 is connected to a first switch K1 through the normally closed contact KJ3, a cathode of the second diode D2 is connected to a connection line of the normally closed contact KJ3 and the first switch K1, a cathode of the third diode D3 is connected to a cathode of the first diode D1, an anode of the third diode D3 is connected to a cathode of the fourth diode D4, an anode of the fourth diode 686d 4 is connected to an anode of the second diode D2, one end of the second switch K2 is connected to the other end of the second inductor L2, the other end of the second switch K2 is connected to a connection line of the third diode D3 and the fourth diode D4, one end of the resistor R3 is connected to the other end of the connection line of the third diode K1, the normally open contact KJ2 is connected in parallel at two ends of the resistor R, the other end of the coil KJ1 is connected with the anode of the fourth diode D4, and the interference suppressor U1 is connected in parallel at two ends of the coil KJ 1. The model of the interference suppressor U1 is P-A220-16-S4T 4. In this embodiment, the load is only to combine the load connected mode who adopts working face combination switch, can take other loads among the practical application, the utility model discloses the improvement point lies in to combine the high frequency interference who adopts working face combination switch through the filtering circuit filtering of design to protection circuit safety does not do special restriction to the load. Additionally, the utility model discloses an interference suppressor U1's design, harmonic that prevents to produce when the operation disturbs other electronic device, simultaneously, input voltage plays the balancing act when changing, and fuse fusing in the interference suppressor when the short circuit perhaps breaks down plays the guard action, has further protection circuit safety, duplicate protection on transformer T has connect filter circuit's basis.
The utility model discloses the working process does: the first capacitor C1, the first inductor L1 and the second capacitor C2 form a pi-type filter circuit, the first capacitor C1, the second inductor L2 and the third capacitor C3 form a pi-type filter circuit, the two pi-type filter circuits form a filter circuit for filtering the transformer T, the secondary side of the transformer T is connected with the filter circuit, high-frequency harmonic interference generated by a frequency converter of the fully mechanized mining face is filtered through the filter circuit, the electronic element of the protector is prevented from being damaged due to overvoltage of a fully mechanized mining face combined switch, and the service life of the fully mechanized mining face combined switch protector is prolonged.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (4)
1. A protection circuit of a combined switch of a fully mechanized mining face is characterized by comprising a protector, a transformer, a third fuse, a first capacitor, a first inductor, a second capacitor, a third capacitor and a load, the input end of the protector is connected with a power supply, the output end of the protector is connected with the primary side of the transformer, the homonymy end of the secondary side of the transformer is connected with one end of a third fuse, the other end of the third fuse is connected with one end of a first capacitor, the other end of the first capacitor is connected with the synonym end of the secondary side of the transformer and one end of a second inductor, one end of the first inductor is connected with one end of a second capacitor, the second capacitor is connected with the other end of a second inductor through the third capacitor, the joint of the second capacitor and the third capacitor is grounded, one end of a load is connected with one end of the first inductor through a first switch, and the other end of the load is connected with the other end of.
2. The protection circuit of the combined switch of the fully mechanized mining face of claim 1, wherein the load comprises a first diode, a second diode, a relay, an interference suppressor and a resistor which are sequentially numbered, the relay comprises a coil, a normally open contact and a normally closed contact, an anode of the first diode is connected with the first switch through the normally closed contact, a cathode of the second diode is connected with a connecting line of the normally closed contact and the first switch, a cathode of the third diode is connected with a cathode of the first diode, an anode of the third diode is connected with a cathode of the fourth diode, an anode of the fourth diode is connected with an anode of the second diode, one end of the second switch is connected with the other end of the second inductor, the other end of the second switch is connected with a connecting line of the third diode and the fourth diode, one end of the resistor is connected with a cathode of the third diode, and the other end of the resistor is connected with one end of the coil, the normally open contact is connected in parallel at two ends of the resistor, the other end of the coil is connected with the anode of the fourth diode, and the interference suppressor is connected in parallel at two ends of the coil.
3. The protection circuit of the combined switch of the fully mechanized mining face of claim 2, wherein the interference suppressor is of a type P-a220-16-S4T 4.
4. The protection circuit of the combined switch of the fully mechanized mining face of claim 1, wherein the protector comprises a first fuse and a second fuse, one end of the first fuse is connected to one end of the power supply, one end of the second fuse is connected to the other end of the power supply, the other end of the first fuse is connected to a homonymous end of the primary side of the transformer, and the other end of the second fuse is connected to a synonym end of the primary side of the transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020941130.6U CN211859935U (en) | 2020-05-28 | 2020-05-28 | Protection circuit of combined switch of fully mechanized coal mining face |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020941130.6U CN211859935U (en) | 2020-05-28 | 2020-05-28 | Protection circuit of combined switch of fully mechanized coal mining face |
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| Publication Number | Publication Date |
|---|---|
| CN211859935U true CN211859935U (en) | 2020-11-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020941130.6U Active CN211859935U (en) | 2020-05-28 | 2020-05-28 | Protection circuit of combined switch of fully mechanized coal mining face |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211859935U (en) |
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2020
- 2020-05-28 CN CN202020941130.6U patent/CN211859935U/en active Active
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