CN210199212U - Load unit protection device in load box - Google Patents
Load unit protection device in load box Download PDFInfo
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- CN210199212U CN210199212U CN201920403515.4U CN201920403515U CN210199212U CN 210199212 U CN210199212 U CN 210199212U CN 201920403515 U CN201920403515 U CN 201920403515U CN 210199212 U CN210199212 U CN 210199212U
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Abstract
The utility model relates to an inside load unit protection device of load box, including the controller with connect in parallel a plurality of resistance subregion's that set up difference in the resistance box resistance cooling fan respectively on three-phase major loop. And a normally open alternating current contactor is connected between each resistance heat radiation fan and the three-phase main loop, and the controller is also electrically connected with a wind pressure detector arranged on each resistance heat radiation fan. The wind pressure detector feeds back to the controller after detecting that the resistance heat radiation fan has an abnormal wind pressure value, and the controller controls the branch where the resistance heat radiation fan is located to be disconnected, so that the disconnected state of the branch is confirmed. The load unit protection device in the load box can cut off the failed branch without completely disconnecting all fan branches, so that the working reliability of the load box is improved.
Description
Technical Field
The utility model relates to an inside load cell protection device of load box.
Background
When the load box works, continuous loading operation is often needed, and the continuous operation time is more than hundreds of hours and less than tens of hours. Because the load box is a device that generates heat (mainly is internal resistance tube), it is inevitable that gears break down due to reasons such as too high temperature rise in use. Usually, when a fault occurs, the whole load box system is manually shut down and then fault removal is carried out, however, the load box can not be continuously loaded, and production is not changed. And may even result in failure of the entire testing process. Sometimes, in order to ensure that the test process is continuously carried out, an override function has to be started, an alarm signal which can cause damage to a load box is ignored, and forced loading is carried out, so that great trouble is caused to production.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a load cell protection device's of load incasement portion hardware architecture treats that the software personnel can improve load case operational reliability to the back of wherein controller programming.
For this reason, provide a load cell protection device of load incasement portion, including controller and a plurality of resistance cooling fan of parallelly connected on the three-phase major loop, the load case includes a plurality of resistance subregion, and each resistance cooling fan sets up the different resistance subregion in the resistance case respectively, all is connected with normally open ac contactor between each resistance cooling fan and the three-phase major loop, and each ac contactor's normally open contact is connected to the controller respectively.
And the three-phase main loop is connected with a phase sequence protection relay in series and then is connected to each resistance heat radiation fan.
And the three-phase main circuit is connected with a phase sequence switching contactor in series behind the phase sequence protection relay and then connected to each resistance heat radiation fan.
And thermal relays are connected in series between each normally-open alternating current contactor and the corresponding resistance heat dissipation fans, and normally-closed contacts of the thermal relays are respectively and electrically connected with the controller.
The three-phase.
The main circuit breaker control circuit comprises a closing circuit, a shunt circuit and an energy storage circuit which are connected in parallel.
Wherein the alternating current contactor is a contactor with the model number LC1D 18.
The controller is also electrically connected with voltage and current detectors arranged on the resistance heat radiation fans.
Wherein the thermal relay is a thermal relay with the model number FR-LRD 14C.
Has the advantages that:
the utility model discloses an inside load unit protection device of load box includes the controller and connects in parallel a plurality of resistance cooling fan on the three-phase major loop, the load box includes a plurality of resistance subregion, each resistance cooling fan sets up the resistance subregion of difference in the resistance box respectively, all be connected with normally open ac contactor between each resistance cooling fan and the three-phase major loop, each ac contactor's normally open contact is connected to the controller respectively, the controller still electricity is connected with the wind pressure detector of setting on each resistance cooling fan. After a software worker programs the controller, the wind pressure detector feeds back to the controller after detecting that the resistance heat radiation fan has an abnormal wind pressure value (judged according to a preset threshold value), the controller controls the branch where the resistance heat radiation fan is located to be disconnected, and obtains the working state of a normally open contact corresponding to a normally open alternating current contactor on the branch, so that the working state of the normally open alternating current contactor on the branch is judged, and the state of the branch in disconnection is confirmed. The load unit protection device in the load box can cut off the failed branch without completely disconnecting all fan branches, so that the working reliability of the load box is improved.
Drawings
The present invention is further explained by using the drawings, but the embodiments in the drawings do not constitute any limitation to the present invention, and for those skilled in the art, other drawings can be obtained according to the following drawings without any inventive work.
Fig. 1 is a main control circuit diagram of the load cell protection device inside the load box of the present invention.
Fig. 2 is a single-phase wiring diagram of the load cell protection device inside the load box of the present invention.
Fig. 3 is a circuit diagram of a normally open contact of the normally open ac contactor of the load cell protection device inside the load box of the present invention.
Fig. 4 is a circuit diagram of the normally closed contacts of the thermal relay of the load cell protection device in the load box according to the present invention.
Fig. 5 is a circuit diagram of a main circuit breaker control circuit of the load cell protection device in the load box of the present invention.
Detailed Description
The invention will be further described with reference to the following examples.
As shown in fig. 1, the load unit protection device inside the load box comprises a controller and a plurality of resistance cooling fans F1-F6 connected in parallel to a three-phase main loop, the load box comprises a plurality of resistance partitions, the six resistance cooling fans F1-F6 are respectively arranged in six different resistance partitions in the load box, and a normally open ac contactor 3 with the model of LC1D18 and a thermal relay 4 with the model of FR-LRD14C are sequentially connected between each resistance cooling fan and the three-phase main loop. A normally open contact 8 (shown in figure 3) of each normally open alternating current contactor 3 and a normally closed contact 9 (shown in figure 4) of each thermal relay 4 are respectively connected to the controller, and the normally open contact 8 and the normally closed contact 9 are respectively connected to a switching power supply 7 (shown in figure 2) to take power. The controller is also electrically connected with wind pressure detectors arranged on the resistance cooling fans and voltage and current detectors (not shown in the figure).
The wind pressure detector detects that there is the unusual wind pressure value (according to the threshold value judgement of predetermineeing) in resistance cooling fan, perhaps voltage, current detector feeds back to the controller after detecting voltage current abnormity, the controller control this resistance cooling fan place branch road disconnection to obtain the operating condition of the normally open contact 8 that normally open ac contactor 3 on this branch road corresponds, judge the operating condition of normally open ac contactor 3 on this branch road with this, thereby confirm the state of this branch road at the disconnection. The load unit protection device in the load box can cut off the failed branch without completely disconnecting all fan branches, so that the load connection is disconnected, and the working reliability of the load box is improved.
The thermal relay 4 is disconnected under the condition of overload, an overload signal is fed back to the controller through the working state of the normally closed contact 9 of the thermal relay, and the controller disconnects the branch where the thermal relay 4 is located after receiving the overload signal.
As shown in fig. 1, a phase sequence protection relay 1 and a phase sequence switching contactor 2 are sequentially connected in series on the three-phase main circuit, and then are connected to the resistance cooling fans F1-F6.
As shown in fig. 2, the load unit protection device inside the load box is further provided with a single-wire working state indicator lamp 5 and a medium-voltage contactor 6 which are connected between the single phase and the neutral line of the three-phase main loop. The medium voltage contactor 6 is connected in parallel with a main breaker control circuit 10 as shown in fig. 5, and the main breaker control circuit 10 includes a closing circuit 101, a shunt circuit 102 and an energy storage circuit 103 which are connected in parallel. The medium voltage contactor 6 obtains the control signal of the controller through the main breaker control circuit 10, thereby disconnecting the single-phase circuit control brake where the medium voltage contactor is located (the specific control mode of the medium voltage contactor and the main breaker control circuit is a conventional control means, and is not described again).
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the protection scope of the present application, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.
Claims (9)
1. The utility model provides an inside load cell protection device of load box, characterized by, includes controller and a plurality of resistance cooling fan of parallelly connected on the three-phase major loop, the load box includes a plurality of resistance subregion, and each resistance cooling fan sets up the resistance subregion of difference in the resistance box respectively, all is connected with normally open ac contactor between each resistance cooling fan and the three-phase major loop, and each ac contactor's normally open contact is connected to the controller respectively, the controller still electricity is connected with the wind pressure detector that sets up on each resistance cooling fan.
2. The load cell protection device inside a load box according to claim 1, wherein a phase sequence protection relay is connected in series to the three-phase main circuit and then connected to each resistance cooling fan.
3. The load cell protection device inside a load box according to claim 2, wherein the three-phase main circuit is connected in series with a phase sequence switching contactor after the phase sequence protection relay and then connected to each resistance cooling fan.
4. The load cell protection device inside a load box according to claim 1, wherein a thermal relay is connected in series between each normally open ac contactor and its corresponding resistance cooling fan, and a normally closed contact of the thermal relay is electrically connected to the controller, respectively.
5. The load cell protection device of claim 1, comprising a medium voltage contactor connected between a single phase and neutral of a three phase main circuit, said medium voltage contactor connected in parallel with a main breaker control circuit.
6. The load cell protection device of claim 5, wherein said main breaker control loop comprises a closing loop, a shunt loop and a tank loop in parallel.
7. The load cell protection device of claim 1, wherein said ac contactor is a model LC1D18 contactor.
8. The load cell protection device of claim 1, wherein said controller is further electrically connected to voltage and current detectors disposed on each of said resistive heat sinks.
9. The load cell protection device of claim 4, wherein said thermal relay is a model FR-LRD14C thermal relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920403515.4U CN210199212U (en) | 2019-03-27 | 2019-03-27 | Load unit protection device in load box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920403515.4U CN210199212U (en) | 2019-03-27 | 2019-03-27 | Load unit protection device in load box |
Publications (1)
| Publication Number | Publication Date |
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| CN210199212U true CN210199212U (en) | 2020-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920403515.4U Active CN210199212U (en) | 2019-03-27 | 2019-03-27 | Load unit protection device in load box |
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| CN (1) | CN210199212U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114152876A (en) * | 2021-11-19 | 2022-03-08 | 广东福德电子有限公司 | Dummy load box, storage medium thereof and loading control method |
-
2019
- 2019-03-27 CN CN201920403515.4U patent/CN210199212U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114152876A (en) * | 2021-11-19 | 2022-03-08 | 广东福德电子有限公司 | Dummy load box, storage medium thereof and loading control method |
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