CN216209706U - Auxiliary device for rotor one-point grounding protection test - Google Patents
Auxiliary device for rotor one-point grounding protection test Download PDFInfo
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- CN216209706U CN216209706U CN202121605898.7U CN202121605898U CN216209706U CN 216209706 U CN216209706 U CN 216209706U CN 202121605898 U CN202121605898 U CN 202121605898U CN 216209706 U CN216209706 U CN 216209706U
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Abstract
The utility model relates to an auxiliary device for a rotor one-point grounding protection test, which comprises a test power supply loop and a test resistance loop; the test power supply loop is used for simulating excitation voltage and rectifying an alternating current power supply into a direct current power supply; the test resistance loop is used for simulating the rotor winding and comprises a first test resistance loop, a second test resistance loop and a third test resistance loop, and the first test resistance loop, the second test resistance loop or the third test resistance loop are respectively switched to the first test resistance loop, the second test resistance loop or the third test resistance loop through a switching element; the test power supply loop is electrically connected with the test resistance loop through a switching element. This auxiliary device easily realizes, convenient to use, switches principle and simple structure, easy control, only needs to insert three test lines during the experiment, does not have other complicacies and tears the line open, improves test efficiency, reduces risks such as wrong wiring, electric shock, can carry out the debugging of rotor earth protection a little fast, accurately.
Description
Technical Field
The utility model relates to the technical field of one-point grounding protection of a generator rotor, in particular to an auxiliary device for a one-point grounding protection test of a rotor.
Background
The generator rotor is a direct current system and is connected with a generator excitation loop through a collecting ring and a carbon brush, and a rotor winding is insulated and protected and is not electrically connected with the rotor. In the long-term operation process of the generator, due to various reasons such as moisture in the rotor, leakage of cooling medium, insulation aging, mechanical vibration and the like, the ground insulation level of the rotor winding is easily reduced, and further, the ground fault of the rotor is caused. If one point is grounded, the insulation of the rotor winding is damaged, the winding is in contact with the rotor, the generator is not damaged due to the fact that the other point is grounded, however, the safety of the generator can be seriously threatened if the second point grounding fault occurs again, the rotor body is burnt due to the fact that the two points of the excitation winding are grounded through large current, air gap magnetic flux is out of balance, the generator set vibrates, the generator is locally magnetized, and the generator can be normally put into operation after being demagnetized. Therefore, a point grounding protection of the rotor is set, the rotor should be stopped for checking when the point grounding occurs, and the protection is only used for alarming and does not act on tripping. The protection adopts the principle of injecting a direct current power supply, and the direct current power supply is self-produced by a rotor grounding protection device. The protection device can monitor the insulation to ground of the excitation loop and the rotor winding of the generator when the generator runs and does not run, and has sensitive protection action and no dead zone.
In the prior art, the debugging of one-point grounding protection of a double-end injection type rotor can be divided into two conditions of no excitation voltage and excitation voltage.
(1) The rotor one-point grounding test method without exciting voltage comprises the following steps: the power switch of the rotor grounding protection device and the rotor injection power switch are closed, the voltage positive end and the voltage negative end are connected (or directly connected by a short-circuit wire) through a small-resistance slide-wire rheostat to simulate a rotor winding at a terminal row, then the device is led out to a rotor large-shaft carbon brush terminal and is in short circuit connection (or directly connected by a short-circuit wire) with the slide-wire rheostat, the simulated rotor winding is grounded through the slide-wire rheostat, the grounding position cannot be calculated by the device due to the fact that excitation voltage does not exist, the grounding position can be seen to be always 50% of the displayed position, but the rotor grounding device can measure the grounding resistance values of the voltage positive end and the voltage negative end which are simulated through the slide-wire rheostat respectively.
(2) The rotor one-point grounding test method when the excitation voltage is applied comprises the following steps: a power switch of a rotor grounding protection device and a rotor injection power switch are closed, a voltage positive end and a voltage negative end are connected with a simulation rotor winding through a small-resistance slide wire rheostat at a terminal row, the simulation rotor winding is connected with a rotor large-shaft carbon brush end and is in short circuit with the slide wire rheostat, the simulation rotor winding is grounded through the slide wire rheostat, direct-current voltage is applied between the rotor voltage positive end and the rotor voltage negative end on a screen by using an experimental instrument, simulation excitation voltage is added into the rotor winding, the resistance value of the slide rheostat is changed, at the moment, the rotor grounding device can display the resistance values of the voltage positive end and the voltage negative end which are simulated to be grounded through the slide wire rheostat respectively, the grounding position (Ur + position is grounded) can be calculated by the device, the grounding position is considered to be 100% by the protection device, the Ur-position is grounded, and the grounding position is considered to be 0% by the protection device).
However, the above test procedure has the following problems:
(1) the protection test wiring in the experimental process is more and complicated, and need insert slide rheostat, test instrument and protection device, the wiring confusion appears easily, in case test wiring mistake short circuit will cause equipment harm and personnel to hurt. In the debugging test process, an additional experimental instrument is needed to be used for adding voltage, and the number of used experimental instruments and tools is large.
(2) The test accuracy of the slide rheostat is poor, the debugging process is not clear and intuitive enough, and the operation steps are multiple. The sliding rheostat slide is adopted in the test without adding the excitation voltage, and the resistance value Rh of a connected circuit cannot be accurately known by changing the resistance of the sliding rheostat, so that whether the measured resistance value Rg displayed in the rotor grounding device is consistent with the resistance value Rh of the sliding rheostat or not cannot be visually checked, and the correctness of the protection constant value action needs to be checked by using the resistance value Rh of the universal variable measuring sliding rheostat; similarly, the sliding rheostat slide is adopted in the excitation voltage test, and the resistance value Rh obtained by changing the resistance of the sliding rheostat cannot be visually compared with the percentage a% of the grounding position calculated by the rotor grounding device at the moment, so that the correctness of the test result is obtained.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects in the prior art, the utility model provides an auxiliary device for a rotor one-point grounding protection test, which can quickly and conveniently debug the rotor one-point grounding protection.
In order to achieve the above purpose, the technical scheme adopted by the utility model comprises the following steps:
an auxiliary device for a rotor one-point grounding protection test is characterized by comprising a test power supply loop and a test resistance loop;
the test power supply loop is used for simulating excitation voltage and rectifying an alternating current power supply into a direct current power supply;
the test resistance loop is used for simulating the rotor winding and comprises a first test resistance loop, a second test resistance loop and a third test resistance loop, and the first test resistance loop, the second test resistance loop or the third test resistance loop are respectively switched to the first test resistance loop, the second test resistance loop or the third test resistance loop through a switching element;
the test power supply loop is electrically connected with the test resistance loop through a switching element.
Further, when the test resistance loop is switched to the first test resistance loop or the second test resistance loop, the auxiliary device is used for testing the grounding resistance value of the rotor grounding protection device.
Further, when the test resistance loop is switched to the test resistance loop three, the auxiliary device is used for testing the grounding position of the rotor grounding protection device.
Further, when the test resistance loop is switched to the test resistance loop three, the test power supply loop preferably rectifies an alternating current power supply of 220V into a direct current power supply of 0-100V.
Further, the switching element is preferably a switching handle.
Further, the test power supply circuit preferably comprises 1 2P AC air switch, 1 power supply module and 2 fuses, wherein the 2P AC air switch, the power supply module and the fuses are connected through a circuit.
Further, the test resistance loop preferably comprises 2 resistance boxes and at least 2 switching handles.
Further, the model and the adjustable resistance range of the 2 resistor boxes are the same, and the 2 resistor boxes are electrically connected through the switching handle.
Further, the test resistance loop further comprises a simulation resistor, and the resistor box is electrically connected with the simulation resistor through the switching handle.
Further, the resistance value of the analog resistor is preferably 0 to 10 Ω.
The utility model has the beneficial effects that:
the auxiliary device for the rotor one-point grounding protection test has the beneficial effects that: the device is easy to realize, convenient to use, simple in switching principle and structure and easy to control, only three test lines need to be connected during testing, other complex disconnection lines are not needed, the testing efficiency is improved, and risks such as wrong connection lines and electric shock are reduced; and secondly, the resistance box is used for replacing the sliding rheostat for testing, the testing process is concise and visual, and the testing result is more accurate.
Drawings
Fig. 1 is a schematic circuit diagram of an auxiliary device for a rotor one-point ground protection test according to an embodiment of the present invention.
Detailed Description
For a clearer understanding of the contents of the present invention, reference will be made to the accompanying drawings and examples.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing and simplifying the description of the present invention, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the utility model.
The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
The auxiliary device for the rotor one-point grounding protection test is used for debugging the rotor one-point grounding protection, and comprises a test power supply loop and a test resistance loop. The present embodiment is explained by debugging the one-point rotor ground protection.
The circuit schematic diagram of the auxiliary device for the rotor one-point grounding protection test shown in fig. 1 comprises a test power supply loop and a test resistance loop, wherein the test power supply loop and the test resistance loop are electrically connected through a switching element;
the test power supply loop is used for simulating excitation voltage and rectifying an alternating current power supply into a direct current power supply;
the test resistance loop is used for simulating a rotor winding and is respectively switched to the first test resistance loop, the second test resistance loop or the third test resistance loop through a switching element;
when the test resistance loop is switched to the first test resistance loop or the second test resistance loop, the auxiliary device is used for testing the grounding resistance value of the rotor grounding protection device;
and when the test resistance loop is switched to the test resistance loop III, the auxiliary device is used for testing the grounding position of the rotor grounding protection device.
Further preferably, the test power supply circuit comprises 1 2P AC air switch ZK, 1 power supply module DY and fuse FU1And fuse FU2The 2P AC air switch ZK, the power module DY and the fuse FU1And said fuse FU2The 2P AC air switch ZK is used for preventing AC short circuit and overload and electricityThe source module DY is used for rectifying 220V alternating current voltage into 0-100V direct current voltage, and the fuse FU1And said fuse FU2Respectively connected to the positive and negative electrodes of the test resistance loop, when a direct current voltage is added, the test resistance loop has the risk of direct current short circuit, and once the short circuit occurs, the fuse FU1Or fuse FU2Will be immediately blown out preventing the power module DY and the resistor box R +, R-from being damaged by a short circuit.
Further preferably, the test resistance loop comprises a switching handle 1QK, a switching handle 2QK, 2 resistance boxes R and a simulation small resistance Rr; the switching handle is used for switching a first test mode, a second test mode or a third test mode, the types and the adjustable resistance ranges of the two resistor boxes R are the same, one resistor box is connected with the positive pole to be R +, the other resistor box is connected with the negative pole to be R-, the positive pole and the negative pole can be separately subjected to grounding tests through the switching handle, and the switching handle can be used as an integral resistor simulation rotor winding to perform grounding position tests.
Specifically, the test commissioning procedure is as follows:
test one: the test resistance loop is switched to the first test resistance loop through a switching handle, namely the test of the grounding resistance value from the anode of the rotor winding loop to the protection device is simulated when no excitation voltage is applied, and at the moment, the rotor winding is simulated by a small resistor Rr (the resistance value is 0-10 omega or is replaced by a short-circuit wire). When the switching handle 1QK is switched to the "rotor one-point grounding test mode without applying the excitation voltage", the contacts 1-2 and 5-6 of the switching handle 1QK are closed and the contacts 3-4 and 7-8 are opened in the circuit shown in fig. 1. When the switching handle 2QK is switched to a mode of simulating the grounding resistance value test of the rotor winding anode to the protection device without adding the excitation voltage, the 1-2 contact of the switching handle 2QK is closed and the 3-4 contact is opened in the loop shown in figure 1. At the moment, one end of a positive test resistance box R + of the test resistance loop is connected with a Ur + end of the rotor protection device for injecting power output, one end of the positive test resistance box R + is connected with an RGND end of the rotor protection device for leading out to a rotor large shaft carbon brush and grounding, the resistance value Rd of the resistance box R + is changed, the measured resistance value Rg displayed in a liquid crystal screen of the rotor grounding protection device is checked, and the numerical values of the two are consistent to indicate that the rotor grounding protection device is correctly measured.
The test steps include:
checking the accuracy of the grounding resistance value measured by the rotor grounding protection device:
the resistance box R + is sequentially set with 3-5 resistance values Rd with different values (the set value is 0-300K omega, the rotor which is larger than 300K omega is judged to have good insulation measurement value and not to be displayed by one-point grounding protection), the measured resistance value Rg displayed in the liquid crystal screen of the rotor grounding protection device and the resistance value Rd changed by the resistance box R + are sequentially checked, and if each value Rg is equal to Rd (the value of the second position after the decimal point is ignored), the measurement of the grounding resistance value by the rotor grounding protection device is accurate.
And the protection constant value action of the rotor grounding protection device is verified:
the protection device is provided with a sensitive segment action value Rc1And a ground operation value Rc2Time delay t of action of sensitive segment1And a ground operation value t2The control words of the sensitive segment action and the grounding action are input. Adjusting the resistance value Rd of the resistance box when Rd is larger than Rc1The protection device does not alarm; when Rd < Rc1，Rd＞Rc2Delayed by t1The protection device has a sensitive section alarm signal without a trip signal; when Rd < Rc1，Rd＜Rc2Delayed by t1、t2The rotor grounding protection device has a sensitive section alarm signal and a trip signal.
And (2) test II: the test resistance loop is switched to the second test resistance loop through a switching handle, namely the test of the grounding resistance value from the negative electrode of the rotor winding loop to the protection device is simulated when the excitation voltage is not applied, and at the moment, the rotor winding is simulated by using a small resistor Rr (the resistance value is 0-10 omega or is replaced by a short-circuit wire). The switching handle 1QK is switched to a mode of 'rotor one-point grounding test mode without exciting voltage', and the contacts 1-2 and 5-6 and the contacts 3-4 and 7-8 of the switching handle 1QK are closed and opened in a loop shown in figure 1. When the switching handle 2QK is switched to a mode II that the exciting voltage is not added to simulate the test of the grounding resistance value of the rotor winding to the protection device, the 3-4 contact of the switching handle 2QK is closed and the 1-2 contact is opened in the loop shown in figure 1. At the moment, one end of a test resistor R-of a negative pole of the test resistor loop is connected with a Ur-end of the rotor protection device for inputting power output, one end of the test resistor loop is connected with an RGND end of the rotor protection device, the RGND end is led out to a rotor large shaft carbon brush and grounded, the resistance Rd of a resistor box R-is changed, and meanwhile, a measurement resistance Rg displayed in a liquid crystal screen of the rotor grounding protection device is checked, and the numerical values of the two should be consistent to indicate that the rotor grounding protection device is correct in measurement.
The test procedure is the same as test one.
In the debugging process of the first test and the second test, the grounding position cannot be calculated by the rotor grounding protection device due to no excitation voltage, and the grounding position can be seen to be always displayed as 50%.
And (3) test III: the test resistance loop is switched to the test resistance loop III through the switching handle, namely the simulation rotor winding positive and negative poles are grounded to the grounding position test calculated by the protection device when the excitation voltage is applied, at the moment, the switching handle 1QK is switched to a mode II, namely an excitation voltage rotor one-point grounding test mode, so that the contacts 3-4 and 7-8 of the switching handle 1QK in the loop shown in figure 1 are closed, and the contacts 1-2 and 5-6 are opened. When the switching handle 2QK is switched to the third mode, the contacts 1-2 and 3-4 of the switching handle 2QK are closed in the circuit shown in fig. 1. At the moment, the resistance box R + is connected with the resistance box R-, the connection line of the resistance box R + and the resistance box R-is simultaneously connected to the RGND end which is led out of the rotor protection device to the rotor large shaft carbon brush and is grounded, and the resistance box R + and the resistance box R-are respectively set to be 50 omega during testing, namely, the resistance box R + and the resistance box R-are used as a 100 omega resistance overall simulation rotor winding grounding loop. Before voltage is added, a resistance level test resistance loop of a multimeter is used for measuring, after no short circuit is detected, the AC neutral switch ZK is switched on, and the rectifying button of the power module DY is adjusted to output DC voltage (50-100V). At this time, it can be seen that the grounding position displayed by the liquid crystal screen of the rotor grounding protection device is always 50%, the grounding position is considered by the protection device to be 100% according to the ground at Ur +, the grounding position is considered by the protection device to be 0%, the resistance values of the resistance box R + and the resistance box R-are considered as the integral resistance of 100 Ω to be adjusted, for example, the grounding position is 100%, the resistance box R + is set to be 0 Ω, and the resistance box R-is set to be 100 Ω; if the ground level is 80%, the resistor box R + is set to 20 Ω, and the resistor box R-is set to 80 Ω, i.e., the ground level a can be described by the formula a ═ 100-R +)/100, and the resistor box R + and the resistor box R-satisfy both (R +) + (R-) -100. And in the test process, whether the resistance box R +, the resistance box R-and the device position display a% meets the above disclosure is checked, and the meeting is qualified, namely the test is qualified.
Test notice:
before the test is started, an RGND end external cable from a rotor grounding device to a rotor large shaft carbon brush and grounded is disconnected, and a rotor grounding protection device is also required to be injected into a generator rotor winding connected with a voltage loop to disconnect the external connection, so that the rotor grounding protection device cannot enter the external loop when a power supply is added in the test. In the excitation voltage simulation test, the switching handle 1QK cannot be switched to the first mode.
The test device of the present embodiment is so designed for two reasons: the device is easy to realize, convenient to use, simple in switching principle and structure and easy to control, only three test lines need to be connected during testing, other complex disconnection lines are not needed, the testing efficiency is improved, and risks such as wrong connection lines and electric shock are reduced; and secondly, the resistance box is used for replacing the sliding rheostat for testing, the testing process is concise and visual, and the testing result is more accurate.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and claims of this patent does not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An auxiliary device for a rotor one-point grounding protection test is characterized by comprising a test power supply loop and a test resistance loop;
the test power supply loop is used for simulating excitation voltage and rectifying an alternating current power supply into a direct current power supply;
the test resistance loop is used for simulating the rotor winding and comprises a first test resistance loop, a second test resistance loop and a third test resistance loop, and the first test resistance loop, the second test resistance loop or the third test resistance loop are respectively switched to the first test resistance loop, the second test resistance loop or the third test resistance loop through a switching element;
the test power supply loop is electrically connected with the test resistance loop through a switching element.
2. The auxiliary device of claim 1, wherein the auxiliary device is used for testing the grounding resistance value of the rotor grounding protection device when the test resistance loop is switched to the test resistance loop one or the test resistance loop two.
3. The auxiliary device of claim 1, wherein the auxiliary device is used for testing a grounding position of the rotor grounding protection device when the test resistance loop is switched to the test resistance loop three.
4. The auxiliary device as claimed in claim 3, wherein when said test resistance loop is switched to said test resistance loop three, said test power supply loop rectifies 220V AC power to 0-100V DC power.
5. The accessory of claim 1, wherein the switching element comprises a switching handle.
6. Auxiliary device as claimed in any of the claims 1-5, characterized in that the test power supply loop comprises 1 2P AC air switch, 1 power supply module and 2 fuses, the 2P AC air switch, the power supply module and the fuses being connected by an electric circuit.
7. Auxiliary device as claimed in claim 6, characterized in that the test resistance circuit comprises 2 resistance boxes and at least 2 switching handles.
8. The auxiliary device as claimed in claim 7, wherein the 2 resistor boxes are identical in type and adjustable resistance range, and the 2 resistor boxes are electrically connected through the switching handle.
9. Auxiliary device according to any of claims 7 to 8, characterized in that said test resistance circuit further comprises a simulated resistance, said resistance box being electrically connected to said simulated resistance through said switching handle.
10. Auxiliary device according to claim 9, characterized in that the resistance of the analog resistor is 0-10 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121605898.7U CN216209706U (en) | 2021-07-15 | 2021-07-15 | Auxiliary device for rotor one-point grounding protection test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121605898.7U CN216209706U (en) | 2021-07-15 | 2021-07-15 | Auxiliary device for rotor one-point grounding protection test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216209706U true CN216209706U (en) | 2022-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121605898.7U Active CN216209706U (en) | 2021-07-15 | 2021-07-15 | Auxiliary device for rotor one-point grounding protection test |
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| Country | Link |
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| CN (1) | CN216209706U (en) |
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2021
- 2021-07-15 CN CN202121605898.7U patent/CN216209706U/en active Active
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