CN211505796U - Low-voltage circuit breaker joint fault detection device - Google Patents
Low-voltage circuit breaker joint fault detection device Download PDFInfo
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- CN211505796U CN211505796U CN201921885915.XU CN201921885915U CN211505796U CN 211505796 U CN211505796 U CN 211505796U CN 201921885915 U CN201921885915 U CN 201921885915U CN 211505796 U CN211505796 U CN 211505796U
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Abstract
The utility model relates to a low-voltage circuit breaker connects fault detection device. A low-voltage circuit breaker connector fault detection device comprising: the device comprises a connector, a connector temperature sensor, an environment temperature sensor, a current transformer, a current collector and a controller; the joint temperature sensor is arranged at the joint and is connected with the controller; the environment temperature sensor is arranged in the circuit breaker at a preset distance from the joint and is connected with the controller; the current transformer is arranged on a primary bus at the outlet connected with the joint and is connected with the current collector; the current collector is connected with the controller. The utility model provides a pair of low voltage circuit breaker connects fault detection method carries out the detection to the joint trouble according to the temperature rise of measured line current value and joint, reaches the effect of early warning in advance.
Description
Technical Field
The utility model relates to a circuit breaker fault detection area especially relates to a low voltage circuit breaker connects fault detection device.
Background
The low-voltage circuit breaker connects the position that breaks down easily in the field operation, and its reason leads to contact resistance increase because the long-term operation of joint is not hard up to cause the joint to generate heat, high temperature destroys the insulation along with time, leads to the circuit breaker to appear interphase short circuit trouble or high temperature burns out the accident.
Most of the existing methods are based on that a temperature measuring probe is directly installed at a cable joint outside a circuit breaker, aiming at the temperature detected by the probe, if the temperature exceeds a set threshold value, an alarm is given or a shunt excitation operating mechanism of the circuit breaker is triggered to carry out trip protection, the method cannot well protect the circuit breaker, the phenomenon in the early stage of the fault cannot be discovered, the early-stage temperature cannot reach the overtemperature threshold value, the alarm and the protection can be carried out only when the fault is damaged to a certain degree, and early warning and maintenance cannot be achieved.
Application number 201710740860.2 discloses a method to circuit breaker inner joint discernment that generates heat, and the joint target of detection is open, must consider influence radiating weather variation such as external sunshine, wind speed, has increased the computational variable of response, is not suitable for the fault diagnosis of closed cabinet nipple moreover, therefore still exists not enoughly in the field, needs the utility model people to study and innovate urgently.
SUMMERY OF THE UTILITY MODEL
In view of the foregoing prior art's weak point, an object of the utility model is to provide a low voltage circuit breaker connects fault detection device can realize judging the circuit breaker through the temperature accuracy that detects the circuit breaker and connect whether there is the trouble.
In order to achieve the purpose, the utility model adopts the following technical proposal:
a low-voltage circuit breaker connector fault detection device comprising: the device comprises a connector, a connector temperature sensor, an environment temperature sensor, a current transformer, a current collector and a controller;
the joint temperature sensor is arranged at the joint and is connected with the controller;
the environment temperature sensor is arranged in the circuit breaker at a preset distance from the joint and is connected with the controller;
the current transformer is arranged on a primary bus at the outlet connected with the joint and is connected with the current collector;
the current collector is connected with the controller.
Preferably, the low-voltage circuit breaker joint fault detection device further comprises a tripping mechanism which is arranged on the primary bus and connected with the controller.
The preferred low-voltage circuit breaker joint fault detection device also comprises an alarm device which is connected with the controller; the alarm device comprises an LED and a loudspeaker.
Preferably, the low-voltage circuit breaker joint fault detection device comprises a controller and a storage device.
Preferably, the controller receives the detection data of the joint temperature sensor, the environment temperature sensor and the current collector once at preset time intervals.
Compared with the prior art, the utility model provides a pair of low voltage circuit breaker connects fault detection device, this method carries out the detection to the joint trouble according to the temperature rise of measured line current value and joint, takes corresponding security measure simultaneously, reaches the effect of early warning in advance, has splendid measurement accuracy to joint in the closed cabinet.
Drawings
Fig. 1 is a flow chart of a low-voltage circuit breaker joint fault detection method provided by the present invention;
fig. 2 is a block diagram of a low-voltage circuit breaker connector fault detection system provided by the present invention;
fig. 3 is data of experiments performed in the examples provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the following description of the present invention will refer to the accompanying drawings and illustrate embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
The utility model provides a low-voltage circuit breaker connects fault detection method, including the step:
s1, detecting the joint temperature and the environment temperature of the circuit breaker joint respectively by the joint temperature sensor and the environment temperature sensor, and transmitting the joint temperature data and the environment temperature data to a controller to calculate the current temperature rise;
s2, detecting the current of the line by a current transformer and transmitting the current to the controller, comparing the current and the current temperature rise with the standard temperature rise under the current condition by the controller, and if the difference value between the current temperature rise and the standard temperature rise exceeds a preset value, determining that a fault exists in a connector of the circuit breaker; otherwise, the circuit breaker connector is normal.
Correspondingly, the utility model also provides a low voltage circuit breaker joint fault detection device that is used for detection method, include: the device comprises a connector 1, a connector temperature sensor 2, an environment temperature sensor 3, a current transformer 4, a current collector 5 and a controller 6;
the joint temperature sensor 2 is arranged at the joint 1 and is connected with the controller 6;
the environment temperature sensor 3 is arranged in the circuit breaker at a preset distance from the joint 1 and is connected with the controller 6;
the current transformer 4 is arranged on a primary bus at an outlet connected with the joint 1 and is connected with the current collector 5;
the current collector 5 is connected with the controller 6.
In particular, the method comprises the following steps of,the environment temperature to be considered by the circuit breaker in the closed cabinet is single, and the joint 1 of the circuit breaker is the joint of an incoming and outgoing line in the circuit breaker and a cable and a copper bar; the joint temperature sensor 2 is arranged at the joint 1 and used for detecting the joint temperature and transmitting the joint temperature data to the controller 6; the ambient temperature sensor 3 is installed in the circuit breaker at a predetermined distance from the terminal 1 (the predetermined distance is set specifically according to the type of the circuit breaker) for detecting the ambient temperature around the terminal 1. The primary bus penetrates through the current transformer 4, the current transformer 4 detects that a current signal flows through the primary bus, and the current signal detected by the current transformer 4 is converted into a current value through the current collector 5 and is transmitted to the controller 6. The controller 6 receives the joint temperature TjtThe ambient temperature ThjAnd calculating the temperature rise, and then comparing the temperature rise and the current value with a standard temperature rise to judge whether the circuit breaker has a fault.
As a preferable scheme, in this embodiment, the calculation formula of the current temperature rise is:
ΔT＝Tjt-Thj；
wherein, the delta T is the current temperature rise; t isjtIs the joint temperature; t ishjIs ambient temperature.
The controller 6 receives the detection data of the joint temperature sensor 2, the ambient temperature sensor 3 and the current collector 5 once at preset time intervals.
Specifically, when a primary bus of the circuit breaker has current passing through, heat is generated under the influence of the internal resistance of the primary bus of the circuit breaker. When the circuit breaker is installed in the field, the contact resistance at the joint of the circuit breaker is larger than that at other positions, and thus heat generation may be significant. At this time, the controller 6 can detect the temperature T of the connector of the circuit breaker through the temperature sensorjtWhile the controller 6 detects the ambient temperature T through the ambient temperature sensor 3hj. When the current flowing through the primary bus is constant, if the contact resistance of the breaker connector 1 is constant. At this time, the heating power of the circuit breaker connector 1 is constant, the heating value is constant, and if the application environment is not changed, the heating value is scatteredThe heating power is also unchanged if the ambient temperature ThjIf not, then the temperature T is measuredjtAnd is not changed. If the ambient temperature ThjChange, then TjtThe temperature rise delta T of the joint 1 is equal to T because the heating power and the heat dissipation power are not changed along with the change of the temperature rise delta Tjt-ThjRemain substantially stable.
As a preferable scheme, in this embodiment, the step of obtaining the standard temperature rise includes:
the circuit breaker and the circuit breaker connector 1 with the same specification are used, under the condition that constant current passes through, the ambient temperature and the connector temperature are collected, and single temperature rise under the condition of constant current is calculated;
obtaining a plurality of groups of single temperature rise data under different constant currents, and performing data fitting to obtain a standard temperature rise table curve;
and inquiring the curve of the standard temperature rise table according to the current value to obtain the standard temperature rise.
The standard temperature rise data is as follows:
| current value | Standard temperature rise |
| I1 | ΔT1 |
| I2 | ΔT2 |
| …… | …… |
| In | ΔTn |
And obtaining a standard temperature rise curve by using a data fitting mode.
In general, the standard temperature rise curve satisfies the following formula, that is, the formula for calculating the standard temperature rise at different current values is:
wherein, Delta TIStandard temperature rise with current I; i is a current measurement; i isedIs a rated current value; delta TedIs the standard temperature rise under rated current; a and b are constants.
Preferably, in this embodiment, the step S2 further includes:
and when the circuit breaker connector 1 has a fault, controlling a circuit breaker opening mechanism to open the brake, reporting to a server, and sending out warning information.
Correspondingly, the circuit breaker further comprises a brake separating mechanism 7 which is arranged on the primary bus and connected with the controller 6.
Preferably, in this embodiment, the circuit breaker further includes an alarm device, which is connected to the controller 6; the alarm device comprises an LED and a loudspeaker.
Specifically, the opening mechanism 7 is used for realizing the opening and breaking functions of the primary bus, and when protection tripping is needed, the controller 6 can obtain the breaker opening mechanism 7 to realize bus breaking for tripping protection. The general failure is due to increased contact resistance of the connector, either due to lack of tightening of the mounting screws, or due to aging of the cable, surface oxidation, and only a quick response to repair is required if a warning is given.
It can thus be seen that the temperature rise AT of the contact 1 is normally constant when the current is constant, and increases as the current increases.
When the contact resistance of the connector 1 is increased due to aging or other reasons, under the condition that the current is not changed, the internal resistance is increased, the heating power is increased, the temperature of the connector is increased, the temperature rise delta T is visually shown to be increased, and therefore the temperature rise is higher than that of the normal internal resistance.
Therefore, the internal resistance condition of the connector 1 can be obtained by detecting the current value, the connector temperature and the environment temperature, when the internal resistance is abnormal, the temperature rise is abnormal, the controller 6 can control the breaker opening mechanism 7 to perform tripping protection, the primary bus is disconnected in time, and accidents are avoided.
Preferably, in this embodiment, the controller 6 includes a storage device, and is configured to store the standard temperature rise data table.
Preferably, in this embodiment, the controller 6 receives the detection data of the joint temperature sensor 2, the ambient temperature sensor 3, and the current collector 5 once at predetermined time intervals.
The rated current is 400A, under the current condition of 400A, the standard temperature rise of the connector of the circuit breaker of the model is 80K, and detection data as shown in figure 3 are obtained, wherein lines No. 5 and No. 6 are lines with increased internal resistance (namely faults); the No. 7 circuit is the temperature in the cabinet, namely the environmental temperature of the joint; no. 8 is the temperature outside the cabinet, namely the temperature outside. Under normal conditions, the change of the external temperature and the current temperature rise are within 80K and in a normal range; the faulty line will exceed 80K and fall into the category of faulty lines. Generally, under the condition of 400A current, the standard temperature rise is 80K, and if the current temperature rise does not exceed the standard temperature rise by 10-20K, the normal temperature rise is normal. That is, the current temperature rise of 90-100K belongs to the normal range. At this time, the predetermined value is 10 to 20K.
It should be understood that equivalent alterations and modifications can be made by those skilled in the art according to the technical solution of the present invention and the inventive concept thereof, and all such alterations and modifications should fall within the scope of the appended claims.
Claims (5)
1. A low-voltage circuit breaker connects fault detection device which characterized in that includes: the device comprises a connector, a connector temperature sensor, an environment temperature sensor, a current transformer, a current collector and a controller;
the joint temperature sensor is arranged at the joint and is connected with the controller;
the environment temperature sensor is arranged in the circuit breaker at a preset distance from the joint and is connected with the controller;
the current transformer is arranged on a primary bus at the outlet connected with the joint and is connected with the current collector;
the current collector is connected with the controller.
2. The apparatus as claimed in claim 1, further comprising a tripping mechanism mounted on the primary bus and connected to the controller.
3. The low voltage circuit breaker joint fault detection device of claim 1, further comprising an alarm device connected to the controller; the alarm device comprises an LED and a loudspeaker.
4. The low voltage circuit breaker joint fault detection apparatus of claim 1 wherein the controller includes a memory device.
5. The low voltage circuit breaker joint fault detection device of claim 1, wherein the controller receives the detection data of the joint temperature sensor, the ambient temperature sensor and the current collector once at predetermined time intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921885915.XU CN211505796U (en) | 2019-11-04 | 2019-11-04 | Low-voltage circuit breaker joint fault detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921885915.XU CN211505796U (en) | 2019-11-04 | 2019-11-04 | Low-voltage circuit breaker joint fault detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211505796U true CN211505796U (en) | 2020-09-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921885915.XU Active CN211505796U (en) | 2019-11-04 | 2019-11-04 | Low-voltage circuit breaker joint fault detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211505796U (en) |
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2019
- 2019-11-04 CN CN201921885915.XU patent/CN211505796U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 411201 28 Bai Shi Road, Jing Kai District, Xiangtan, Hunan Patentee after: Weisheng Energy Technology Co.,Ltd. Address before: 411201 28 Bai Shi Road, Jing Kai District, Xiangtan, Hunan Patentee before: WASION ELECTRIC Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |