CN106531480B - Vacuum circuit breaker contact on-line monitoring method - Google Patents
Vacuum circuit breaker contact on-line monitoring method Download PDFInfo
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- CN106531480B CN106531480B CN201610997753.3A CN201610997753A CN106531480B CN 106531480 B CN106531480 B CN 106531480B CN 201610997753 A CN201610997753 A CN 201610997753A CN 106531480 B CN106531480 B CN 106531480B
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- contact
- spring
- compression amount
- set value
- circuit breaker
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/0015—Means for testing or for inspecting contacts, e.g. wear indicator
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- Keying Circuit Devices (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention discloses a vacuum circuit breaker contact on-line monitoring method which comprises a contact abrasion loss on-line monitoring method and a contact pressure on-line monitoring method. The invention indirectly obtains the abrasion loss of the contact by measuring the compression amount of the contact spring so as to judge whether the contact needs to be replaced, calculates the real-time pressure of the contact by monitoring the temperature of the movable conducting rod of the contact, and judges whether the contact spring needs to be replaced.
Description
Technical Field
The invention belongs to the field of power supply and distribution electrical equipment, and particularly relates to an online monitoring method for a contact of a vacuum circuit breaker.
Background
The circuit breaker is an important switch device in a power system, and is used for controlling the input and the exit of a power line or equipment and protecting the normal operation of the line in the operation power grid. In all grid operation accidents, accidents caused by high-voltage circuit breakers account for a considerable proportion of both times and power failure times caused by the accidents. Therefore, carry out on-line monitoring to the circuit breaker, replace traditional periodic overhaul mode, the operating condition who in time knows the circuit breaker is to improving the power supply reliability decisive meaning.
The intelligent circuit breaker integrates the modern high-voltage zero-arcing technology, the electronic technology, the electric automation technology, the network communication technology, the computer and the software technology thereof and the like. The intelligent circuit breaker is a multifunctional release integrating protection, measurement and monitoring, and mainly comprises a microprocessor unit, a signal detection and acquisition unit, a switching value input unit, a display and keyboard unit, an execution output unit, a communication interface, a power supply and the like. Because the primary circuit of the circuit breaker has the characteristics of high voltage, large current and strong magnetic field environment, the online monitoring of the circuit breaker is difficult to realize. The monitoring of present circuit breaker mechanical parameter usually realizes through the moving contact that detects the circuit breaker, however, this kind of detection mode is to the contact wearing and tearing of circuit breaker, contact compression spring's fatigue deformation can not measure, and contact wearing and tearing and spring deformation all will lead to the contact pressure of circuit breaker's contact to diminish, increase the bounce time when the contact closes a floodgate, simultaneously, cause the resistance increase in primary circuit, the long-term work temperature rise of direct influence circuit breaker.
For the vacuum circuit breaker, a butt contact method (butt contact) is generally adopted. The moving contact can not advance any more after contacting the static contact, and the contact pressure of the contact is provided by a compression spring (sometimes called a closing buffer spring) of each pole of contact. The contact compression spring is used for providing contact pressure for the butt contact under the action of pressure; secondly, the contact is ensured to still keep certain contact pressure after being worn, so that the contact is reliably contacted, and thirdly, the switch-on bounce is prevented. When the contact compression spring fails, the circuit breaker fails or malfunctions. Therefore, online monitoring of the contact compression spring is achieved, and the method has practical significance for monitoring of the circuit breaker.
Disclosure of Invention
The invention aims to provide an online monitoring method for a contact of a vacuum circuit breaker, which can monitor the abrasion condition of the contact of the circuit breaker and the fatigue state of a contact spring on line.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the on-line monitoring method for the contact of the vacuum circuit breaker comprises a contact abrasion loss on-line monitoring method, wherein the contact abrasion loss on-line monitoring method is to indirectly obtain the contact abrasion loss by measuring the compression amount of a contact spring so as to judge whether the contact needs to be replaced, the contact spring is arranged between a contact movable conducting rod and an operating mechanism insulating pull rod, and the method specifically comprises the following steps:
A. measuring the compression amount of a contact spring, when the vacuum circuit breaker is used for the first time, measuring the initial compression amount of the contact spring and setting the initial compression amount as an initial compression amount value, and measuring the compression amount of the contact spring once after the vacuum circuit breaker is switched on every time and recording the compression amount as a current compression amount value;
B. converting the compression amount of the contact spring into a contact abrasion amount, wherein the contact abrasion amount is the initial value of the compression amount and the current value of the compression amount;
C. and comparing the abrasion loss of the contact with a set value, and judging whether the contact needs to be replaced.
Further, the set value in the step C includes a set value a and a set value B, the set value a is 2.5mm, the set value B is 3mm, when the contact wear amount is greater than the set value a and less than the set value B, it is determined that the contact needs to be replaced, a warning message is sent to remind a user of the contact replacement, when the contact wear amount is greater than the set value B, it is determined that the contact needs to be replaced, and a warning message is sent to warn that the contact needs to be replaced or the circuit breaker needs to be stopped.
Preferably, the measurement of the compression of the contact spring is measured by a displacement sensor.
Furthermore, the displacement sensor is a miniature laser displacement sensor, and the laser displacement sensor detects the compression amount of the contact spring through a reflector plate fixed at the compression end of the contact spring.
The contact on-line monitoring method also comprises a contact pressure on-line monitoring method, wherein the contact pressure on-line monitoring method is used for calculating the pressure of a contact spring by monitoring the temperature of a movable conducting rod of the contact in real time and combining with the compression data of the contact spring, so that the contact pressure is obtained.
The further calculation formula of the contact pressure is as follows:
f is KX, wherein F is the contact pressure, K is the elastic coefficient, and X is the contact spring compression amount;
K＝(Gt×d4)/(8×Dm3x Nc), wherein Gt is the elastic modulus of the material at the temperature t, and is obtained by a table look-up method, and the data in the table is the contact spring at intervals within the range of 25-325 DEG C16 groups of data at 20 ℃, d is the wire diameter of the spring, Dm is the middle diameter of the spring, and Nc is the effective number of turns of the spring;
and when the F is less than the pressure set value, sending out prompt information for replacing the contact spring, wherein the pressure set value is selected according to the rated value of the contact pressure of the breaker contact, and the pressure set value is equal to 60% of the rated value.
When the measured temperature of the movable conducting rod is more than 325 ℃, a warning message is sent out, and the warning message is used for warning that the contact spring has to be replaced.
Due to the adoption of the technical scheme, the invention has the technical progress that: the invention indirectly obtains the abrasion loss of the contact by measuring the compression amount of the contact spring so as to judge whether the contact needs to be replaced, calculates the real-time pressure of the contact by monitoring the temperature of the movable conducting rod of the contact, and judges whether the contact spring needs to be replaced.
Detailed Description
The present invention will be described in further detail with reference to the following examples:
the invention relates to an online monitoring method for a vacuum circuit breaker contact, which comprises an online monitoring method for contact abrasion loss and an online monitoring method for contact pressure. The contact abrasion loss on-line monitoring method indirectly obtains the contact abrasion loss by measuring the compression amount of the contact spring so as to judge whether the contact needs to be replaced, the contact pressure on-line monitoring method calculates the real-time pressure of the contact by monitoring the temperature of the movable conducting rod of the contact, and judges whether the contact spring needs to be replaced.
For monitoring the wear condition of the contact, at present, no document or technology is available for monitoring the wear condition of the contact. In general, a vacuum circuit breaker adopts an electric energy storage spring operating mechanism, the stroke (displacement) of an insulating pull rod is not very stable, and meanwhile, the stroke (displacement) of a moving contact of a vacuum switch tube is also unstable due to abrasion of a contact, so that the online monitoring of the abrasion of the contact in the industry is blank. The on-line monitoring method of the invention indirectly measures the abrasion loss of the contact by measuring the compression amount of the contact, the measured data is stable and accurate, and a reliable basis for judging the abrasion loss of the contact is provided.
Besides the abrasion of the contact, the vacuum circuit breaker can prolong the bounce time of the contact when the contact is switched on because the pressure of the contact spring is insufficient, and simultaneously cause the increase of the resistance of a primary loop, thereby influencing the long-term working temperature rise of the vacuum circuit breaker, leading the contact of the circuit breaker to be abraded in an accelerated way, and leading the elasticity of the contact spring to be influenced because of overhigh temperature, leading the contact spring to be heated and annealed in a compressed state, generating permanent deformation and further influencing the contact pressure of the contact. Therefore, the monitoring of the contact also comprises the monitoring of the contact pressure, and the online monitoring method of the invention indirectly realizes the monitoring of the contact pressure by monitoring the temperature of the movable conducting rod of the contact. In order to facilitate monitoring, a temperature sensor is required to be installed on the contact moving conductive rod, and the temperature sensor is more precisely embedded on the outer surface of the contact moving conductive rod.
The invention relates to an online monitoring method for a vacuum circuit breaker contact, which comprises an online monitoring method for the contact abrasion loss, wherein the online monitoring method for the contact abrasion loss indirectly obtains the contact abrasion loss by measuring the compression amount of a contact spring so as to judge whether the contact needs to be replaced, the contact spring is arranged between a contact movable conducting rod and an operating mechanism insulating pull rod, and the online monitoring method specifically comprises the following steps:
A. measuring the compression amount of a contact spring, when the vacuum circuit breaker is used for the first time, measuring the initial compression amount of the contact spring and setting the initial compression amount as an initial compression amount value, and measuring the compression amount of the contact spring once after the vacuum circuit breaker is switched on every time and recording the compression amount as a current compression amount value;
B. converting the compression amount of the contact spring into a contact abrasion amount, wherein the contact abrasion amount is the initial value of the compression amount and the current value of the compression amount;
C. and comparing the abrasion loss of the contact with a set value, and judging whether the contact needs to be replaced.
And C, setting values in the step C comprise a setting value A and a setting value B, wherein the setting value A is 2.5mm, the setting value B is 3mm, when the contact abrasion loss is larger than the setting value A and smaller than the setting value B, the contact is judged to be replaced, a reminding message is sent, a user is reminded of replacing the contact, when the contact abrasion loss is larger than the setting value B, the contact is judged to be replaced, a warning message is sent, and the warning message is used for warning that the contact needs to be replaced or the circuit breaker needs to be stopped.
In order to ensure the accuracy of measurement and simultaneously consider that the installation space is not very large, the measurement of the compression amount of the contact spring is realized by a miniature laser displacement sensor, because the laser displacement sensor utilizes reflected light during measurement, and a reflector plate (a reflector plate) is required to be arranged for improving the measurement accuracy and accuracy, the laser displacement sensor detects the compression amount of the contact spring by the reflector plate fixed at the compression end of the contact spring, and because the spring can rotate in the working process, the emitter plate is made into a wafer. The reflector plate is fixed at the compression end of the spring, and can be fixed at other positions capable of detecting the compression amount of the spring to adapt to the installation space.
The contact on-line monitoring method also comprises a contact pressure on-line monitoring method, wherein the contact pressure on-line monitoring method is used for calculating the pressure of a contact spring by monitoring the temperature of a movable conducting rod of the contact in real time and combining with the compression data of the contact spring, so that the contact pressure is obtained.
The calculation formula of the contact pressure is as follows:
f is KX, wherein F is the contact pressure, K is the elastic coefficient, and X is the contact spring compression amount;
K＝(Gt×d4)/(8×Dm3xnc), where Gt is the elastic modulus of the material at temperature t, and due to the influence of temperature, the elastic modulus of the contact spring will change irregularly with time, there is no applicable theoretical calculation formula, and only a curve chart and a corresponding data table can be made by experiment and obtained by table look-up, in the table of the invention, the data is 16 groups of data of the contact spring at 20 ℃ in the range of 25 ℃ to 325 ℃, d is the wire diameter of the spring,dm is the middle diameter of the spring, and Nc is the effective number of turns of the spring;
and when the F is less than the pressure set value, sending out prompt information for replacing the contact spring, wherein the pressure set value is selected according to the rated value of the contact pressure of the breaker contact, and the pressure set value is equal to 60% of the rated value.
When the measured temperature of the movable conducting rod is higher than 325 ℃ (when the temperature is higher than 350 ℃, the spring can be annealed out of the wire, irreversible permanent deformation is generated), the failure of the spring is judged, and warning information is sent out to warn that the contact spring needs to be replaced.
Claims (4)
1. The method for monitoring the contact of the vacuum circuit breaker on line is characterized by comprising a method for monitoring the contact abrasion loss on line, wherein the method for monitoring the contact abrasion loss on line indirectly obtains the contact abrasion loss by measuring the compression amount of a contact spring so as to judge whether the contact needs to be replaced, wherein the contact spring is arranged between a movable conductive rod of the contact and an insulating pull rod of an operating mechanism, and the method specifically comprises the following steps:
A. measuring the compression amount of a contact spring, when the vacuum circuit breaker is used for the first time, measuring the initial compression amount of the contact spring and setting the initial compression amount as an initial compression amount value, and measuring the compression amount of the contact spring once after the vacuum circuit breaker is switched on every time and recording the compression amount as a current compression amount value;
B. converting the compression amount of the contact spring into a contact abrasion amount, wherein the contact abrasion amount is the initial value of the compression amount and the current value of the compression amount;
C. comparing the abrasion loss of the contact with a set value, and judging whether the contact needs to be replaced;
the compression amount of the contact spring is measured by a displacement sensor;
the on-line monitoring method of the contact pressure is characterized in that the temperature of the movable conducting rod of the contact is monitored in real time, and the pressure of the contact spring is calculated by combining the compression data of the contact spring, so that the contact pressure is obtained;
the calculation formula of the contact pressure is as follows:
f is KX, wherein F is the contact pressure, K is the elastic coefficient, and X is the contact spring compression amount;
K＝(Gt×d4)/(8×Dm3x Nc), wherein Gt is the elastic modulus of the material when the temperature is t, and the elastic modulus is obtained by a table look-up mode, the data in the table is 16 groups of data of the contact spring at 20 ℃ intervals in the range of 25-325 ℃, d is the wire diameter of the spring, Dm is the middle diameter of the spring, and Nc is the effective coil number of the spring;
and when the F is less than the pressure set value, sending out prompt information for replacing the contact spring, wherein the pressure set value is selected according to the rated value of the contact pressure of the breaker contact, and the pressure set value is equal to 60% of the rated value.
2. The method for on-line monitoring the contact of the vacuum circuit breaker according to claim 1, wherein the set value in the step C comprises a set value A and a set value B, the set value A is 2.5mm, the set value B is 3mm, when the contact abrasion loss is larger than the set value A and smaller than the set value B, the contact is judged to be replaced, a reminding message is sent to remind a user of replacing the contact, when the contact abrasion loss is larger than the set value B, the contact is judged to be replaced, a warning message is sent to warn that the contact needs to be replaced or the circuit breaker is stopped.
3. The on-line monitoring method for the contact of the vacuum circuit breaker according to claim 1, wherein the displacement sensor is a micro laser displacement sensor, and the micro laser displacement sensor detects the compression amount of the contact spring through a reflector plate fixed at the compression end of the contact spring.
4. The method for on-line monitoring the contact of the vacuum circuit breaker as claimed in claim 1, wherein when the temperature of the moving conductive rod is measured to be more than 325 ℃, a warning message is issued to warn that the contact spring must be replaced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610997753.3A CN106531480B (en) | 2016-11-14 | 2016-11-14 | Vacuum circuit breaker contact on-line monitoring method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610997753.3A CN106531480B (en) | 2016-11-14 | 2016-11-14 | Vacuum circuit breaker contact on-line monitoring method |
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| CN106531480A CN106531480A (en) | 2017-03-22 |
| CN106531480B true CN106531480B (en) | 2020-01-24 |
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| CN110702005B (en) * | 2019-09-30 | 2021-07-20 | 浙江八达电子仪表有限公司时通电气分公司 | Handcart switch cabinet |
| CN113533081A (en) * | 2020-04-15 | 2021-10-22 | Oppo（重庆）智能科技有限公司 | Intensity detection device and method and computer storage medium |
| CN111928984A (en) * | 2020-05-29 | 2020-11-13 | 廊坊研领科技有限公司 | Plum blossom contact tensioning pressure measurement ware |
| CN113161164B (en) * | 2021-04-23 | 2022-10-11 | 扬州新概念电气有限公司 | Method for measuring contact abrasion of vacuum circuit breaker |
| FR3124306A1 (en) | 2021-06-16 | 2022-12-23 | Schneider Electric Industries Sas | Device for breaking a medium voltage electrical circuit |
| CN114870202B (en) * | 2022-04-20 | 2023-08-29 | 北京理工大学 | Under-actuated double-finger rotary twisting clamp holder for operating vascular interventional surgical instrument and clamping method |
| CN116148657B (en) * | 2023-04-21 | 2023-07-07 | 浙江威利坚科技股份有限公司 | Electromagnetic leakage circuit breaker operation monitoring and diagnosing method |
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| JP2010015778A (en) * | 2008-07-02 | 2010-01-21 | Mitsubishi Electric Corp | Vacuum electromagnetic contactor |
| CN203825160U (en) * | 2014-03-19 | 2014-09-10 | 河南森海电气有限公司 | Circuit breaker over travel detection device |
| CN204905172U (en) * | 2015-09-11 | 2015-12-23 | 常熟开关制造有限公司(原常熟开关厂） | Circuit breaker with aassessment contact wear |
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