CN204903702U - Send out motor insulation testing arrangement based on return voltage method - Google Patents
Send out motor insulation testing arrangement based on return voltage method Download PDFInfo
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- CN204903702U CN204903702U CN201520672549.5U CN201520672549U CN204903702U CN 204903702 U CN204903702 U CN 204903702U CN 201520672549 U CN201520672549 U CN 201520672549U CN 204903702 U CN204903702 U CN 204903702U
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Abstract
The utility model discloses a send out motor insulation testing arrangement based on return voltage method, including the experimental power of direct current, power change -over switch, first discharge switch, the damping module of discharging, second discharge switch, voltage detecting switch, voltmeter, ampere meter, first test terminal and second test terminal, the damping module of discharging comprises with the reactor of taking the air gap is parallelly connected the power resistor, the one end of the experimental power of direct current loops through power change -over switch and ampere meter connection first test terminal, other end connection second test terminal and ground connection, and the second discharge switch is parallelly connected mutually with the series branch that the first discharge switch and the damping module of discharging are formed, and this parallel branch connects between the tie point and second test terminal of power change -over switch and ampere meter, and voltage detecting switch and voltmeter series connection are between the tie point and second test terminal of power change -over switch and ampere meter. The utility model discloses a different motor insulation return voltage that fills under the discharge time can be measured, test operating safety convenience is promoted.
Description
Technical field
The utility model relates to a kind of generator insulating proving installation based on return voltage method.
Background technology
Along with economic development, power industry sustainable and healthy development, installation total amount and generated energy increase further, and according to the annual bulletin statistics of China Electricity Council 2014, national unified capacity of installed generator is 13.6 hundred million kilowatt hours, increases by 8.7% on a year-on-year basis.As the high-rating generator of power supply main equipment, to power grid security, economical operation, there is material impact, to detection and the correct status assessment of its insulating property, work out scientific and reasonable operation, maintenance and renewal plan, the utilization factor and power grid security reliability improving generator is all of great importance.
High-rating generator adopts the insulation of epoxy-mica complex solid, its insulating property are subject to the impact of the factors such as electric field, mechanical stress, temperature, moisture and occur aging, the detection method that generator insulating performance is traditional has insulation resistance, polarization index to measure, measurement of partial discharge, dielectric loss measurement, the means such as AC and DC withstand voltage test.Return voltage diagnosis (RVM, ReturnVoltageMeasurement) be the new method of low pressure Non-Destructive Testing insulating property of developed recently, ultimate principle is: insulating medium presents polarization phenomena under the DC voltage effect applied, there is bound charge in surface, internal dipole aligns, remove applied voltage and behind short circuit medium the two poles of the earth, surface charge discharges immediately, inner generation process of depolarization, after opening the two poles of the earth shorting stub, process of depolarization still continues, between medium the two poles of the earth, present electric potential difference, and this voltage is called return voltage U
r, humidified insulation, aging or dirty time, the change of insulative dielectric performance can cause U
robvious change.Utilize the change of return voltage maximal value and return voltage maximal value time of occurrence and return voltage polarized spectrum can the performance of inverting insulating medium, and its state of insulation is comparatively comprehensively assessed.Return voltage diagnosis obtains Preliminary Applications in the Insulation test of the equipment such as power transformer and cable, and due to the difference of insulating medium and insulation system, the application in generator insulating Performance Detection and state estimation lacks corresponding device and equipment.
The problem needing those skilled in the art urgently to solve is exactly: the principle detecting insulating property according to return voltage, for the insulating medium feature of generator, develop the device of a kind of low pressure Non-Destructive Testing and assessment generator insulating state, reach that test philosophy is clear, operation is simple and reliable, the object that security is high.
Utility model content
Technical problem to be solved in the utility model is: provide a kind of generator insulating proving installation based on return voltage method.
Solve the problems of the technologies described above, the technical scheme that the utility model adopts is as follows:
A kind of generator insulating proving installation based on return voltage method, it is characterized in that: described generator insulating proving installation comprises DC experiment power supply, power change-over switch, the first discharge switch, electric discharge damping module, the second discharge switch, voltage detection switch, voltage table, reometer, the first test lead and the second test lead, wherein, the damping module that discharges is composed in parallel by the reactor of power resistor and band air gap; One end of described DC experiment power supply is connected described first test lead by power change-over switch with reometer successively, the other end connects described second test lead and ground connection, the series arm that described second discharge switch forms with described first discharge switch and the damping module that discharges is in parallel, this parallel branch is connected between the tie point of described power change-over switch and reometer and described second test lead, and described voltage detection switch and voltage table are connected in series between the tie point of described power change-over switch and reometer and described second test lead.
As preferred implementation of the present utility model, described DC experiment power supply can export the DC voltage between 10V to 5000V.
Switch charging and discharging state fast for the ease of proving installation, as preferred implementation of the present utility model, described power change-over switch be possess quick-speed turning on-off function, switch is withstand voltage reaches the switch of 20kV.
Realize automatically controlling discharge and recharge time and testing process for the ease of proving installation, improve as one of the present utility model, described generator insulating proving installation also comprises control module; Described control module is connected with the control end of described DC experiment power supply, power change-over switch, the first discharge switch, the second discharge switch and voltage detection switch respectively, and described control module can control the output voltage of described DC experiment power supply and control the closed off-state of described power change-over switch, the first discharge switch, the second discharge switch and voltage detection switch respectively.
Compared with prior art, the utility model has following beneficial effect:
The utility model is provided with DC experiment power supply, power change-over switch, first discharge switch, electric discharge damping module, second discharge switch, voltage detection switch, voltage table and reometer, thus, can on the insulating medium of tested person generator, apply DC experiment power supply by using this device and control the discharge and recharge time, generator insulating return voltage under the different discharge and recharge time is measured to help user, generate polarized spectrum, the state of insulation of tested person generator is completed by inversion reckoning, effectively improve processing safety and the convenience of generator insulating test.Further, automatic control discharge and recharge time and the testing process of this proving installation can be realized by setting up control module.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:
Fig. 1 is the circuit theory diagrams of generator insulating proving installation of the present utility model;
Fig. 2 is the process control chart that return voltage measured by generator insulating proving installation of the present utility model;
Fig. 3 is the generator insulating return voltage polarized spectrum oscillogram that generator insulating proving installation of the present utility model exports.
Embodiment
As shown in Figure 1, generator insulating proving installation based on return voltage method of the present utility model, comprise DC experiment power supply DC, power change-over switch K1, first discharge switch K2, electric discharge damping module RL, second discharge switch K3, voltage detection switch K4, voltage table V, reometer A, first test lead T1 and the second test lead T2, wherein, DC experiment power supply DC can export the DC voltage between 10V to 5000V, electric discharge damping module RL is composed in parallel by the reactor of power resistor and band air gap, the parameter of the reactor of power resistor and band air gap should be determined according to the maximum output voltage of this generator insulating proving installation, be as the criterion to below 1A to limit initial drain.
One end of above-mentioned DC experiment power supply DC is connected the first test lead T1 by power change-over switch K1 with reometer A successively, the other end connects the second test lead T2 and ground connection, the series arm that second discharge switch K3 and the first discharge switch K2 and the damping module RL that discharges forms is in parallel, this parallel branch is connected between the tie point of power change-over switch K1 and reometer A and the second test lead T2, and voltage detection switch K4 and voltage table V is connected in series between the tie point of power change-over switch K1 and reometer A and the second test lead T2.Switch charging and discharging state fast for the ease of proving installation, above-mentioned power change-over switch K1 preferably possesses quick-speed turning on-off function, switch is withstand voltage reaches the switch of 20kV.
The mode that this generator insulating proving installation connects tested person generator G is: the first test lead T1 is directly connected on the stator winding of the tested phase of tested person generator G by high-tension cable, particular location is the outlet box that tested person generator G exports, second test lead T2 passes through ground connection, illustrate: three phase generator test is that each phase is carried out separately, when carrying out A phase study, proving installation high-pressure side is received on A phase stator winding by high-tension cable, particular location is the outlet box place receiving generator outlet, proving installation other end ground connection; B phase and C phase short circuit ground connection.
The core idea of this generator insulating proving installation is: apply the trial voltage being applicable to generator insulating medium feature and insulation system, by setting maximum charging voltage and discharge and recharge time, complete recovery voltage measurement flow process and generate polarized spectrum for generator insulating state estimation.Therefore, generator insulating proving installation of the present utility model can be used according to the following steps to carry out generator insulating test after being connected with this generator insulating proving installation by tested person generator G:
See Fig. 2, first, maximum charging voltage U is pre-determined
cmaxwith duration of charging t
cwith t discharge time
d, usually
Secondly, power turn-on change-over switch K1, makes the insulating medium of tested person generator G at U
cmaxlower charging t
ctime;
Again, deenergization change-over switch K1, close the first discharge switch K2, and by electric discharge damping module RL pre-arcing, observe after discharge current (i.e. initial drain) is less than setting value at reometer A, close the second discharge switch K3, and discharge t
dtime;
Then, close voltage detection switch K4, disconnects the first discharge switch K2 and the second discharge switch K3, with voltage Table V sampling reverts voltage signal U
r, elapsed time t
r, until return voltage is down to null value, off voltage detector switch K4;
Finally, close the second discharge switch K3, again discharges, and disconnects the second discharge switch K3, prepares next discharge and recharge and recovery voltage measurement circulation.
With reference to Fig. 3, show the generator insulating return voltage polarized spectrum oscillogram that this device exports, specifically comprise: take duration of charging as horizontal ordinate, maximum return voltage value under the corresponding duration of charging is ordinate, draw generator insulating polarization spectrogram, for the Condition assessment of insulation of tested person generator G.
In addition, generator insulating proving installation of the present utility model also can set up control module; Control module is connected with the control end of DC experiment power supply DC, power change-over switch K1, the first discharge switch K2, the second discharge switch K3 and voltage detection switch K4 respectively, control module can control the output voltage of DC experiment power supply DC and control the closed off-state of power change-over switch K1, the first discharge switch K2, the second discharge switch K3 and voltage detection switch K4 respectively, thus realizes automatic control discharge and recharge time and the testing process of this generator insulating proving installation.
The utility model is not limited to above-mentioned embodiment; according to foregoing; according to ordinary technical knowledge and the customary means of this area; do not departing under the utility model above-mentioned basic fundamental thought prerequisite; the utility model can also make the equivalent modifications of other various ways, replacement or change, all drops among protection domain of the present utility model.
Claims (4)
1. the generator insulating proving installation based on return voltage method, it is characterized in that: described generator insulating proving installation comprises DC experiment power supply (DC), power change-over switch (K1), the first discharge switch (K2), electric discharge damping module (RL), the second discharge switch (K3), voltage detection switch (K4), voltage table (V), reometer (A), the first test lead (T1) and the second test lead (T2), wherein, the damping module (RL) that discharges is composed in parallel by the reactor of power resistor and band air gap, one end of described DC experiment power supply (DC) is connected described first test lead (T1) by power change-over switch (K1) with reometer (A) successively, the other end connects described second test lead (T2) and ground connection, the series arm that described second discharge switch (K3) forms with described first discharge switch (K2) and the damping module (RL) that discharges is in parallel, this parallel branch is connected between the tie point of described power change-over switch (K1) and reometer (A) and described second test lead (T2), described voltage detection switch (K4) and voltage table (V) are connected in series between the tie point of described power change-over switch (K1) and reometer (A) and described second test lead (T2).
2. generator insulating proving installation according to claim 1, is characterized in that: described DC experiment power supply (DC) can export the DC voltage between 10V to 5000V.
3. generator insulating proving installation according to claim 1, is characterized in that: described power change-over switch (K1) for possessing quick-speed turning on-off function, switch is withstand voltage reaches the switch of 20kV.
4. the generator insulating proving installation according to claims 1 to 3 any one, is characterized in that: described generator insulating proving installation also comprises control module; Described control module is connected with the control end of described DC experiment power supply (DC), power change-over switch (K1), the first discharge switch (K2), the second discharge switch (K3) and voltage detection switch (K4) respectively, and described control module can control the output voltage of described DC experiment power supply (DC) and control the closed off-state of described power change-over switch (K1), the first discharge switch (K2), the second discharge switch (K3) and voltage detection switch (K4) respectively.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109073700A (en) * | 2016-05-11 | 2018-12-21 | 通快瑞士股份公司 | The method of device is provided for monitoring the monitoring device of safety offer device and for monitoring safety |
| CN109283445A (en) * | 2018-10-24 | 2019-01-29 | 中车株洲电力机车有限公司 | A kind of insulation detecting method and controller of energy storage type rail vehicle charging system |
| RU2730535C1 (en) * | 2020-01-30 | 2020-08-24 | Государственное бюджетное образовательное учреждение высшего образования Нижегородский государственный инженерно-экономический университет (НГИЭУ) | Electrical insulation quality monitoring device |
| US11073559B2 (en) * | 2017-12-19 | 2021-07-27 | Volkswagen Aktiengesellschaft | Electrical system and method for diagnosing the functionality of power relays in an electrical system |
| CN114002567A (en) * | 2021-11-09 | 2022-02-01 | 广州思泰信息技术有限公司 | Rapid one-key test system and method for insulation performance |
| CN119247138A (en) * | 2024-12-09 | 2025-01-03 | 北方魏家峁煤电有限责任公司 | Generator shaft voltage and bearing insulation online test device |
-
2015
- 2015-08-31 CN CN201520672549.5U patent/CN204903702U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109073700A (en) * | 2016-05-11 | 2018-12-21 | 通快瑞士股份公司 | The method of device is provided for monitoring the monitoring device of safety offer device and for monitoring safety |
| US11119156B2 (en) | 2016-05-11 | 2021-09-14 | Trumpf Schweiz Ag | Monitoring arrangement for monitoring a safety sensor and method for monitoring a safety sensor |
| US11073559B2 (en) * | 2017-12-19 | 2021-07-27 | Volkswagen Aktiengesellschaft | Electrical system and method for diagnosing the functionality of power relays in an electrical system |
| CN109283445A (en) * | 2018-10-24 | 2019-01-29 | 中车株洲电力机车有限公司 | A kind of insulation detecting method and controller of energy storage type rail vehicle charging system |
| CN109283445B (en) * | 2018-10-24 | 2021-05-11 | 中车株洲电力机车有限公司 | Insulation detection method and controller of energy storage type rail vehicle charging system |
| RU2730535C1 (en) * | 2020-01-30 | 2020-08-24 | Государственное бюджетное образовательное учреждение высшего образования Нижегородский государственный инженерно-экономический университет (НГИЭУ) | Electrical insulation quality monitoring device |
| CN114002567A (en) * | 2021-11-09 | 2022-02-01 | 广州思泰信息技术有限公司 | Rapid one-key test system and method for insulation performance |
| CN119247138A (en) * | 2024-12-09 | 2025-01-03 | 北方魏家峁煤电有限责任公司 | Generator shaft voltage and bearing insulation online test device |
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Effective date of registration: 20200422 Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee after: Electric Power Research Institute of Guangdong Power Grid Co.,Ltd. Address before: Guangzhou City, Guangdong province Yuexiu District 510080 Dongfeng East Road, No. 8 building water Kong Guangdong Co-patentee before: WUHAN DAYANG YITIAN TECHNOLOGY Co.,Ltd. Patentee before: Electric Power Research Institute of Guangdong Power Grid Co.,Ltd. |