CN218647095U - Insulation detection system for excitation coil of generator and exciter - Google Patents
Insulation detection system for excitation coil of generator and exciter Download PDFInfo
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- CN218647095U CN218647095U CN202222928469.4U CN202222928469U CN218647095U CN 218647095 U CN218647095 U CN 218647095U CN 202222928469 U CN202222928469 U CN 202222928469U CN 218647095 U CN218647095 U CN 218647095U
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Abstract
The utility model provides a generator and exciter excitation coil insulation detection system, including the generator interface, be provided with in the generator interface by the S1 switch, the secondary side of T2 transformer, R1 sampling resistance and the S2 switch concatenate the motor detection circuit who constitutes in proper order, S1 switch and S2 switch are connected with respectively and draw the circuit, two draw the circuit respectively with H1 excitation sliding ring and H2 main shaft sliding ring intercommunication; a power supply circuit is arranged in the generator interface and comprises a primary side of a T1 transformer, a secondary side of the T1 transformer is connected with a primary side of a T3 transformer and a primary side of a T4 transformer in parallel, an H1 excitation slip ring is electrically connected with an S2 switch, a secondary side of the T4 transformer is connected between the H1 excitation slip ring and the S2 switch in parallel, an H2 main shaft slip ring is electrically connected with the S1 switch, and a secondary side of the T3 transformer is connected between the H2 main shaft slip ring and the S2 switch in parallel. The utility model discloses can only carry out the carbon brush contact on the insulation detection time measuring messenger's sliding ring, guarantee the life of sliding ring.
Description
Technical Field
The utility model relates to an excitation coil insulation detection technical field, concretely relates to generator and exciter excitation coil insulation detecting system.
Background
The excitation system failure caused by the insulation damage to the ground of the generator excitation winding is easy to cause the risk of loss of excitation, so the insulation detection of the generator excitation winding is very necessary. In the brushless excitation system, because the excitation winding of the generator is arranged on the rotor, when the excitation winding is measured, an additional slip ring is required to be led out for testing (H1 excitation slip ring), and the other slip ring is directly connected with the main shaft (H2 main shaft slip ring) in addition to the additional slip ring directly connected with the excitation winding of the generator so as to test the insulation level between the excitation winding and the main shaft.
However, in the prior art, the slip ring is provided with the fixed carbon brush and the rotating carbon brush, so that even if the insulation detection of the excitation coil is not performed, the fixed carbon brush and the rotating carbon brush can be continuously contacted and rubbed with each other as long as the motor acts, and the long-time friction of the carbon brush can influence the service life of the carbon brush, thereby influencing the normal contact of the insulation detection system.
SUMMERY OF THE UTILITY MODEL
In view of this, the to-be-solved problem of the present invention is to provide a generator and exciter excitation coil insulation detection system, which can make the carbon brush on the slip ring contact when performing insulation detection, and the carbon brush does not contact when not in use, thereby ensuring the service life of the slip ring.
In order to solve the technical problem, the utility model adopts the technical scheme that:
a generator and exciter excitation coil insulation detection system comprises a generator interface, wherein a motor detection circuit formed by sequentially connecting an S1 switch, a secondary side of a T2 transformer, an R1 sampling resistor and an S2 switch in series is arranged in the generator interface, the S1 switch and the S2 switch are respectively connected with an outgoing circuit, and the two outgoing circuits are respectively communicated with an H1 excitation slip ring and an H2 main shaft slip ring;
the power supply circuit is arranged in the generator interface and comprises a primary side of a T1 transformer, a secondary side of the T1 transformer is connected with a primary side of a T3 transformer and a primary side of a T4 transformer in parallel, an H1 excitation slip ring is electrically connected with an S2 switch, a secondary side of the T4 transformer is connected between the H1 excitation slip ring and the S2 switch in parallel, an H2 main shaft slip ring is electrically connected with the S1 switch, and a secondary side of the T3 transformer is connected between the H2 main shaft slip ring and the S2 switch in parallel.
Further, the S1 switch and the S1 switch are double-gate switches, and an R2 preset resistor with infinite resistance is connected between the S1 switch and the S1 switch in series.
Furthermore, the secondary side of the T1 transformer is connected in parallel with the primary side of the T2 transformer.
Further, the primary side of the T3 transformer and the primary side of the T4 transformer are connected in series with a K3 switch K11 relay communicated with the control module.
Furthermore, the R1 sampling resistor is connected in parallel with an F1 operational amplifier device for collecting and amplifying voltage, and the F1 operational amplifier device is communicated with the control module.
Further, the excitation detection circuit comprises an exciter interface, the exciter interface is internally provided with an excitation detection circuit, the excitation detection circuit comprises an S11 switch, a secondary side of a T22 transformer, an R11 sampling resistor and an S22 switch which are sequentially connected in series, an exciter field winding is separately connected between the S11 switch and the S22 switch in series, the R11 sampling resistor is connected with F2 operational amplifier equipment for collecting and amplifying voltage in parallel, and the F2 operational amplifier equipment is communicated with control module data.
Further, the S11 switch and the S22 switch are double-gate switches, and an R22 preset resistor with an infinite resistance value is separately connected in series between the S11 switch and the S22 switch.
Furthermore, power supply circuits with the same structure are arranged in the exciter interface and the generator interface, each power supply circuit comprises a V0 power supply, the V0 power supply is electrically connected with the primary side of a T1 transformer, and the secondary sides of the T1 transformers are respectively connected with a stabilized voltage power supply 1 and a stabilized voltage power supply 2.
Furthermore, the control module is respectively connected with a relay input, an exciter interface, a generator interface and a relay output, and the relay input is communicated with the remote control module;
the relay input and the relay output are composed of a plurality of groups of relays and relay switches which correspond to each other.
The utility model has the advantages and positive effects that:
the lead-out circuits are arranged in the motor detection circuit, each lead-out circuit is respectively connected with the secondary side of the T3 transformer and the secondary side of the T4 transformer in series, the secondary side of the T3 transformer and the secondary side of the T4 transformer are electrified, so that the carbon brushes on the slip ring are contacted, meanwhile, the primary side of the T3 transformer and the primary side of the T4 transformer are connected in series on the primary side of the T1 transformer, only after the generator interface is communicated, the carbon brushes on the slip ring can be contacted (the secondary side of the T3 transformer and the secondary side of the T4 transformer can be electrified), the carbon brushes on the slip ring can be contacted during insulation detection, the carbon brushes are not contacted when not used, and the service life of the slip ring is ensured.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is an overall structural view of a generator and exciter field coil insulation detection system of the present invention;
fig. 2 is a system circuit diagram of a generator and exciter field coil insulation detection system of the present invention including a generator interface;
fig. 3 is a system circuit diagram of a generator and exciter field coil insulation detection system of the present invention including only an exciter interface.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiment in the utility model, it is ordinary in the art
All other embodiments obtained by the skilled person without any inventive work belong to the scope of protection of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The utility model provides a generator and exciter excitation coil insulation detection system, as shown in FIG. 1, its system is including control module, and control module is connected with relay input, exciter interface, generator interface and relay output respectively, relay input and remote control module data intercommunication. The relay input and the relay output are formed by a plurality of relays and corresponding relay switches, the remote control module inputs corresponding control instructions into the control module by enabling different relay switches to act, and the control module gives corresponding feedback according to the received control instructions. The output of the relay is connected with feedback equipment, such as an indicator light, alarm equipment or feedback equipment, so that monitoring personnel can know the detection result visually.
As shown in fig. 2, a power supply circuit is included in the generator interface, the power supply circuit includes a V0 power supply, the V0 power supply is electrically connected to a primary side of a T1 transformer, a secondary side of the T1 transformer is respectively connected to a regulated power supply 1 and a regulated power supply 2, so that the V0 power supply supplies power to the regulated power supply 1 and the regulated power supply 2, and the regulated power supply 1 and the regulated power supply 2 output stable low-voltage power to the control module, the relay input and the relay output stable power.
A motor detection circuit (a circuit in a dotted line frame in a figure 2) is arranged in the generator interface, the motor detection circuit comprises an S1 switch, a secondary side of a T1 transformer, an R1 sampling resistor and an S2 switch which are sequentially connected in series, and the primary side of the T2 transformer is connected with the secondary side of the T1 transformer in parallel so as to provide detection current for the motor detection circuit. During actual detection, a motor excitation winding is serially arranged between an S1 switch and an S2 switch, a detection power supply is provided for a secondary side of a T2 transformer, meanwhile, an F operational amplifier device is arranged in a generator interface, the F operational amplifier device obtains voltages at two ends of an R1 sampling resistor, only a control module is transmitted after amplification processing, and the control module gives a feedback result of whether a ground fault exists according to received data.
Since the field winding of the generator is on the rotor, the field winding must be tapped by an additional slip ring for testing purposes. Besides the H1 excitation slip ring directly connected with the excitation winding of the generator, the generator also comprises an H2 main shaft slip ring connected with the main shaft, a carbon brush group is arranged on the two slip rings, and in order to prolong the service life of the carbon brush and the slip ring, the carbon brush is not contacted at ordinary times only when in test. Therefore, two groups of lead-out circuits are arranged in the motor detection circuit and used for enabling the H1 excitation slip ring and the H2 spindle slip ring to be conducted and respectively electrically connected with the S2 switch and the S1 switch, and the generator excitation winding is connected into the motor detection circuit.
Taking the corresponding lead-out circuit of the H2 spindle slip ring as an example, the H2 spindle slip ring includes a fixed carbon brush and a rotating carbon brush, and the rotating carbon brush is fixedly arranged on the spindle. The leading-out circuit comprises a secondary side of a T3 transformer, a fixed carbon brush of the H2 spindle slip ring is electrically connected with the S1 switch, and the secondary side of the T3 transformer is connected between the fixed carbon brush and the S1 switch in parallel. And supplying power to the fixed carbon brush through a T3 transformer to enable the fixed carbon brush to be in contact with the rotating carbon brush. The H1 excitation slip ring is correspondingly led out of the secondary side of the T4 transformer in the circuit and is connected with the S2 switch.
The secondary side of the T1 transformer is connected with the primary side of the T3 transformer and the primary side of the T4 transformer in parallel, and the primary side of the T3 transformer and the primary side of the T4 transformer are connected with the K3 switch and the K11 relay in series. The K3 switch is controlled by the control module, the control module enables the corresponding K3 relay to be electrified, the K3 switch is closed, the primary side of the T3 transformer and the primary side of the T4 transformer are electrified, and the H1 excitation slip ring and the H2 main shaft slip ring are connected.
After the K3 switch is closed, if the carbon brushes on the slip rings are in good contact, the secondary sides of the T3 and T4 transformers are in short circuit through the slip rings, the primary windings of the T3 and T4 transformers are low in impedance, the K11 relay normally acts, the K11 switch corresponding to the K11 relay is closed, the contact is good, and the control module starts an insulation detection control program after receiving a signal. If any carbon brush of the slip ring is in poor contact, the secondary side of the T3 and T4 transformers are in a high impedance state or are in an open circuit state, the primary side windings of the T3 and T4 transformers are in a high impedance state, the K11 relay cannot normally act, and the control module does not receive a good contact signal, so that feedback for stopping insulation detection is given.
The motor detection circuit is internally provided with an R2 preset resistor, wherein the R2 preset resistor is a ground resistor with infinite resistance value and is used for simulating ground faults, and whether the detection system can normally operate or not is detected. Preferably, the S1 switch and the S2 switch are double-gate switches, and the R2 preset resistor is separately connected in series between the S1 switch and the S2 switch. And the R2 preset resistor or the motor excitation winding is connected into the detection circuit respectively by controlling the positions of the switch blades of the S1 switch and the S2 switch.
As shown in fig. 3, the exciter interface is adapted to communicate with the exciter field winding, and since the exciter field winding is disposed on the stator, the excitation detection circuit in the exciter interface can communicate directly with the exciter field winding. The excitation detection circuit comprises an S11 switch, a secondary side of a T22 transformer, an R11 sampling resistor and an S22 switch which are sequentially connected in series, wherein an exciter field winding and an R22 preset resistor with infinite resistance are respectively connected between the S11 switch and the S22 switch in series. And a power supply circuit with the same structure as that in the generator interface is arranged in the exciter interface so as to electrify the secondary side of the T22 transformer.
When the exciter field winding has a ground fault, the RS ground resistance in fig. 2 and 3 (forming a loop through the ground, there is no resistance between the two grounds in fig. 2) is added to change the current on the excitation detection circuit. The exciter interface is also provided with F2 operational amplifier equipment, the F2 operational amplifier equipment acquires voltage at two ends of the R11 sampling resistor, only the control module is transmitted after amplification processing, and the control module gives a feedback result of whether the ground fault exists according to received data.
The utility model discloses a theory of operation and working process as follows:
taking the working process in fig. 2 as an example, the remote control module gives a grounding simulation detection instruction, the relay corresponding to the input of the K1 relay acts, the instruction is input to the control module, the control module simultaneously makes the S1 switch and the S2 switch act, the R2 preset resistor is connected into the motor detection circuit, the R2 preset resistor, the R1 sampling resistor and the secondary side of the T2 transformer form a loop, the F1 operational amplifier device obtains the voltage of the R1 sampling resistor, amplifies the voltage and transmits the amplified voltage to the control module, and the control module receives a signal and gives feedback.
The remote control module gives a grounding fault detection instruction, the control module enables the S1 switch and the S2 switch to act simultaneously, the S1 switch and the S2 switch are respectively communicated with the H2 main shaft slip ring and the H1 excitation slip ring, the control module controls the K3 switch to be closed, the secondary sides of the T3 and T4 transformers are electrified, the H2 main shaft slip ring is in contact with the electric brush of the H1 excitation slip ring, and the motor excitation winding is serially arranged between the S1 switch and the S2 switch. Meanwhile, the control module receives a signal of the action of the K11 relay, the F1 operational amplifier device obtains R1 sampling resistance voltage, amplifies the voltage and transmits the amplified voltage to the control module, and the control module receives the signal and gives feedback.
The above detailed description of the embodiments of the present invention is only for the purpose of describing the preferred embodiments of the present invention, and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be covered by the present patent.
Claims (9)
1. A generator and exciter excitation coil insulation detection system is characterized by comprising a generator interface, wherein a motor detection circuit formed by sequentially connecting an S1 switch, a secondary side of a T2 transformer, an R1 sampling resistor and an S2 switch in series is arranged in the generator interface, the S1 switch and the S2 switch are respectively connected with an outgoing circuit, and the two outgoing circuits are respectively communicated with an H1 excitation slip ring and an H2 main shaft slip ring;
the power supply circuit is arranged in the generator interface and comprises a primary side of a T1 transformer, a secondary side of the T1 transformer is connected with a primary side of a T3 transformer and a primary side of a T4 transformer in parallel, an H1 excitation slip ring is electrically connected with an S2 switch, a secondary side of the T4 transformer is connected between the H1 excitation slip ring and the S2 switch in parallel, an H2 main shaft slip ring is electrically connected with the S1 switch, and a secondary side of the T3 transformer is connected between the H2 main shaft slip ring and the S2 switch in parallel.
2. The system of claim 1, wherein the S1 switch and the S1 switch are double-gate switches, and a R2 pre-set resistor of infinite resistance is connected in series between the S1 switch and the S1 switch.
3. A generator and exciter field coil insulation detection system as claimed in claim 1, wherein the secondary side of the T1 transformer is connected in parallel with the primary side of the T2 transformer.
4. The system of claim 1, wherein the primary side of the T3 transformer and the primary side of the T4 transformer are coupled in series with a K3 switch and a K11 relay in communication with the control module.
5. The system of claim 1, wherein the R1 sampling resistor is coupled in parallel with an F1 op-amp device that collects and amplifies voltage, the F1 op-amp device communicating with the control module.
6. The system of claim 1, comprising an exciter interface, wherein an exciter detection circuit is disposed in the exciter interface, the exciter detection circuit is formed by sequentially connecting an S11 switch, a secondary side of a T22 transformer, an R11 sampling resistor, and an S22 switch in series, an exciter field winding is separately connected between the S11 switch and the S22 switch in series, the R11 sampling resistor is connected in parallel with an F2 operational amplifier device for collecting and amplifying voltage, and the F2 operational amplifier device is connected with the control module in series.
7. A generator and exciter field coil insulation detection system as claimed in claim 6, wherein the S11 switch and the S22 switch are double-gate switches, and an R22 pre-set resistor with infinite resistance is connected in series between the S11 switch and the S22 switch.
8. The system of claim 6, wherein a power supply circuit with the same structure is arranged in each of the exciter interface and the generator interface, the power supply circuit comprises a V0 power supply, the V0 power supply is electrically connected with a primary side of a T1 transformer, and a secondary side of the T1 transformer is respectively connected with a regulated power supply 1 and a regulated power supply 2.
9. A generator and exciter field coil insulation detection system as claimed in claim 6, wherein the control module has a relay input, an exciter interface, a generator interface and a relay output connected thereto, respectively, the relay input communicating with the remote control module;
the relay input and the relay output are both composed of a plurality of groups of relays and corresponding relay switches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222928469.4U CN218647095U (en) | 2022-10-31 | 2022-10-31 | Insulation detection system for excitation coil of generator and exciter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222928469.4U CN218647095U (en) | 2022-10-31 | 2022-10-31 | Insulation detection system for excitation coil of generator and exciter |
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| Publication Number | Publication Date |
|---|---|
| CN218647095U true CN218647095U (en) | 2023-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222928469.4U Active CN218647095U (en) | 2022-10-31 | 2022-10-31 | Insulation detection system for excitation coil of generator and exciter |
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| Country | Link |
|---|---|
| CN (1) | CN218647095U (en) |
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2022
- 2022-10-31 CN CN202222928469.4U patent/CN218647095U/en active Active
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