CN219576644U - KP silicon controlled rectifier pre-detection device - Google Patents
KP silicon controlled rectifier pre-detection device Download PDFInfo
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- CN219576644U CN219576644U CN202321266383.8U CN202321266383U CN219576644U CN 219576644 U CN219576644 U CN 219576644U CN 202321266383 U CN202321266383 U CN 202321266383U CN 219576644 U CN219576644 U CN 219576644U
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Abstract
The utility model relates to a KP silicon controlled rectifier pre-detection device, which is based on an alternating current power supply and a rectifier bridge, wherein a first circuit breaker is connected in series between the output end of the alternating current power supply and the input end of the rectifier bridge; the utility model comprises a detection control unit, a current-limiting resistance circuit breaking unit and a closing control unit, wherein the first circuit breaker is controlled to be connected with the closing control unit, the current-limiting resistance circuit breaking unit is connected in parallel with two ends of the first circuit breaker, the rectifier bridge outputs KP detection result signals to the detection control unit, and the current-limiting resistance circuit breaking unit and the closing control unit are controlled to be connected with the detection control unit. The utility model has the effect of protecting the rectification system of the variable-frequency power supply.
Description
Technical Field
The utility model relates to the field of KP (Kelly programmable gate array) silicon-controlled rectifier protection devices, in particular to a KP silicon-controlled rectifier pre-detection device.
Background
The variable-frequency power supply mainly comprises a rectifying system and an inversion system. Referring to fig. 1 and 2, a conventional rectifying system includes a rectifying bridge through which alternating current is rectified into direct current, and a circuit breaker is connected in series between an alternating current power source and the rectifying bridge. In the past, because the power of the variable-frequency power supply is smaller, the power of the rectification system is also smaller, and most of the variable-frequency power supply is a conventional 380V input voltage, and the rectification current is about tens of amperes. If the two-phase or three-phase short circuit is caused by the breakdown fault of the silicon controlled rectifier during power transmission, the protection can be realized by tripping a breaker at the front end of the input of the rectifier bridge.
Along with the continuous increase of the power of the variable-frequency power supply, the voltage born by part of the rectifier bridge of the rectifier system and the current passing through the part of the rectifier bridge are also larger and larger, if the KP (key point) silicon controlled rectifier on the rectifier bridge arm has breakdown fault, two-phase or three-phase short circuit is caused at the same time, and very large short circuit current is caused at the moment of closing. The circuit breaker at the front end of the rectifier bridge cannot realize effective instant protection, the circuit breaker is burnt out lightly, and the incoming bus at the front end of the circuit breaker is burnt out heavily, so that the power supply transformer is burnt out, and even the personal casualties are caused. Therefore, the pre-detection of the lead-in wire of the KP of the rectifier bridge becomes an inevitable measure for protecting the rectifier bridge of the variable frequency power supply before the rectifier bridge is switched on.
Disclosure of Invention
In order to protect a rectifying system of a variable frequency power supply, the utility model provides a KP (key point) silicon controlled rectifier pre-detection device.
The utility model provides a KP silicon-controlled rectifier pre-detection device, which adopts the following technical scheme:
the utility model provides a KP silicon controlled rectifier pre-examination device, is based on alternating current power supply and rectifier bridge, establish ties between alternating current power supply's the output and the input of rectifier bridge and have first circuit breaker, including detection control unit, current-limiting resistance circuit breaker unit and closing control unit, first circuit breaker controlled connect in closing control unit, current-limiting resistance circuit breaker unit connects in parallel the both ends of first circuit breaker, the rectifier bridge to detection control unit output KP testing result signal, current-limiting resistance circuit breaker unit with closing control unit all controlled connect in detection control unit.
According to the technical scheme, the first breaker is firstly opened, and the current-limiting resistance breaking unit is controlled to work through the detection control unit, so that alternating current of an alternating current power supply is output to the rectifier bridge through the current-limiting resistance breaking unit; and then the rectifier bridge outputs a KP detection result signal to the detection control unit through the existing KP thyristor state signal detection system, when the KP detection result signal shows that the thyristor is not broken down, the detection control unit controls the first circuit breaker to normally close through the closing control unit, when the KP detection result signal shows that the thyristor is broken down, the detection control unit does not output a signal for enabling the first circuit breaker to close to the closing control unit, and at the moment, the first circuit breaker is still in a non-opening state, so that the variable-frequency power supply rectifier system is protected.
Preferably, the current limiting resistor breaking unit comprises second circuit breakers, two ends of each second circuit breaker are connected in parallel with two ends of the first circuit breaker, and a current limiting resistor is connected in series between the end of each second circuit breaker and the end of the first circuit breaker electrically connected with the end.
By adopting the technical scheme, when the first circuit breaker is opened and the second circuit breaker is closed, the alternating current power supply voltage is fully loaded on the plurality of current limiting resistors, so that the front end of the rectifier bridge only generates weak currents, and the weak currents can be consumed on the plurality of current limiting resistors in the form of heat energy, and the possibility of safety accidents is reduced; and no matter the silicon controlled rectifier is in a breakdown or non-breakdown state, the current-limiting resistor breaking unit only works for a few seconds, so that the potential safety hazard caused by excessive heating of the current-limiting resistor can be avoided to the greatest extent while the rectifying bridge normally outputs KP detection result signals.
Preferably, the current limiting resistor breaking unit further comprises a first switch and a second relay, the first switch is controlled by the detection control unit, the first switch is used for controlling the second relay, and the second relay is used for controlling the opening and closing state of the second breaker.
Through adopting above-mentioned technical scheme, utilize first switch and second relay to make relevant staff can be through the open and shut floodgate state of detection control unit control second circuit breaker, the operation of being convenient for improves KP silicon controlled rectifier's preliminary examination efficiency.
Preferably, the closing control unit comprises a second switch and a first relay, the second switch is controlled by the detection control unit, the second switch is used for controlling the first relay, and the first relay is used for controlling the opening and closing state of the first circuit breaker.
Through adopting above-mentioned technical scheme, utilize second switch and first relay to make relevant staff can be through the switch state of detecting the first circuit breaker of control unit control, the operation of being convenient for improves KP silicon controlled rectifier's preliminary examination efficiency.
Preferably, the detection control unit comprises a detection control board, and a first signal input end and a first signal output end are arranged on the detection control board; the first signal input end is used for outputting a throw-in signal of the current-limiting resistance circuit-breaking unit, and the first signal output end is used for receiving the throw-in signal and controlling the current-limiting resistance circuit-breaking unit.
By adopting the technical scheme, the detection control board is utilized to control the input or the non-input of the current-limiting resistance circuit-breaking unit, so that the starting of the KP thyristor pre-detection is controlled, and the current-limiting resistance circuit-breaking unit can be controlled more conveniently.
Preferably, the detection control board is further provided with a second signal input end and a second signal output end, the second signal input end is used for receiving the KP detection result signal, and the second signal output end controls the closing control unit according to the KP detection result signal.
Through adopting above-mentioned technical scheme, after the second signal input terminal reaches KP testing result signal, can in time pass through the second signal output terminal and pass through the switch-on state of closing control unit control first circuit breaker, can more conveniently control first circuit breaker according to KP testing result signal.
Preferably, the detection control board is provided with a third signal output terminal for outputting a fault signal.
Through adopting above-mentioned technical scheme, when the silicon controlled rectifier is in breakdown state, utilize the output of third signal output end to export fault signal to in time inform relevant staff to carry out maintenance work.
Preferably, a test switch is connected in series between the first signal input end and the second signal output end.
By adopting the technical scheme, when the detection switch is closed, the first signal input end receives the input signal of the current-limiting resistance circuit breaking unit, and then the first circuit breaker is directly controlled to be closed through the second signal output end, so that the detection pre-detection device can work normally.
In summary, the present utility model includes at least one of the following beneficial technical effects: firstly, opening a gate by using a first breaker, and then throwing a current-limiting resistor short-circuit unit into the gate by related personnel through a detection control board, so that alternating current output by an alternating current power supply is output to the input end of a finishing bridge through a plurality of current-limiting resistors; then the rectifier bridge outputs a KP detection result signal to the detection control board through the existing KP thyristor state signal detection system, when the KP detection result signal shows that the thyristor is not broken down, the detection control board enables the first circuit breaker to be switched on through the switching-on control unit, and therefore alternating current energy output by the alternating current power supply can be output to the rectifier bridge; when the KP detection result signal shows that the silicon controlled rectifier breaks down, the detection control board controls the closing control unit to be not operated, so that the first circuit breaker is still in a switching-on state, the silicon controlled rectifier causes a short circuit phenomenon to occur in the rectifier bridge, the voltage of the alternating current power supply is loaded on the current limiting resistor, electric energy can be consumed on the current limiting resistor in a heat energy mode, personal safety accidents are not easy to cause, and the fact that whether the KP silicon controlled rectifier breaks down or not before the rectifier bridge closes the first circuit breaker is achieved through the structure, so that the protection of a variable frequency power supply rectifying system is achieved;
in addition, the detection control board can also output a fault signal when the silicon controlled rectifier breaks down, so that related personnel can overhaul the rectifier bridge in time.
Drawings
FIG. 1 is a schematic block diagram of a conventional rectifying system;
FIG. 2 is a circuit diagram of a conventional rectifying system;
FIG. 3 is a functional block diagram of an embodiment of the present utility model;
fig. 4 is a circuit diagram mainly used for showing a current-limiting resistor breaking unit and a closing control unit in the embodiment of the utility model;
fig. 5 is a circuit diagram of the detection control board in the embodiment of the present utility model.
Reference numerals: 1. a rectifier bridge; 2. a current limiting resistor breaking unit; 3. a closing control unit; 4. and detecting a control board.
Detailed Description
The utility model is described in further detail below with reference to fig. 1-4.
Referring to fig. 1 and 2, the conventional rectifying system includes a rectifying bridge 1 and a control unit connected in series between an output end of an ac power source and an input end of the rectifying bridge 1 unit, for controlling and protecting the conventional rectifying system, and ac power of the ac power source can be converted into dc power through the rectifying bridge 1 unit.
The control unit comprises a first circuit breaker K1 and a first relay VBR, and when the first relay VBR works normally, the first circuit breaker K1 is controlled to be closed, so that the output end of the alternating current power supply can be electrically connected to the input end of the rectifier bridge 1; when the first relay VBR is powered down, the first breaker K1 is controlled to be opened, so that the alternating current power supply and the rectifier bridge 1 are disconnected electrically. And when the current value of the first breaker K1 flowing through the circuit breaker is too large, the breaker K1 can be caused to trip, and the function of protecting the rectifier bridge 1 is achieved.
However, as the power of the variable-frequency power supply is continuously increased, the voltage born by the rectifying bridge 1 and the current passing through the rectifying bridge 1 of the rectifying system are also increased, if the KP on the rectifying bridge arm has breakdown fault, two-phase or three-phase short circuit is caused at the same time, and a very large short circuit current is caused at the moment of closing. The first breaker K1 cannot realize effective instantaneous protection, the first breaker K1 is burnt out lightly, and the front-end incoming bus of the first breaker K1 is burnt out heavily, so that the power supply transformer is burnt out, and even the personal casualties are caused. Therefore, the pre-detection of the thyristor inlet wire of the rectifier bridge 1KP of the rectifier bridge 1 before the switching-on of the rectifier bridge 1 becomes a necessary measure for protecting the rectifier bridge 1 of the variable frequency power supply.
The embodiment of the utility model discloses a KP silicon controlled rectifier pre-detection device.
Referring to fig. 3, a KP thyristor pre-inspection device includes a current-limiting resistor breaking unit 2, a detection control unit and a closing control unit 3, where the current-limiting resistor breaking unit 2 is connected in parallel to two ends of the closing control unit 3, the closing control unit 3 is used to control a first breaker K1, and the closing control unit 3 and the current-limiting resistor breaking unit 2 are both controlled and connected to the detection control unit. When the rectifier bridge 1KP silicon controlled rectifier needs to be pre-checked, a switching-on trigger signal is input to the detection control unit, so that the current-limiting resistor breaking unit 2 starts to work, and an alternating current power supply AC is input to the rectifier bridge 1 through the current-limiting resistor breaking unit 2. If the silicon controlled rectifier breaks down, the rectifying bridge 1 will generate a short circuit phenomenon at this time, the rectifying bridge 1 inputs a closing signal to the detection control unit, the detection control unit outputs the closing signal to the closing control unit 3, so that the short circuit device starts to work, and the alternating current power supply and the rectifying bridge 1 are in an open circuit state, thereby protecting the rectifying system of the variable frequency power supply.
Referring to fig. 3 and 4, the current limiting resistor breaking unit 2 includes a second circuit breaker K2, a second relay K2, a first switch jd_1 and a plurality of current limiting resistors, in this embodiment, the second circuit breaker K2 is a three-stage circuit breaker, and ends of each stage of switch in the second circuit breaker K2 are respectively connected in parallel with two ends of each stage of switch in the first circuit breaker K1. The first switch jd_1 is controlled by the detection control unit, one end of the first switch jd_1 is electrically connected to one end of the second relay VZJ, and the second relay VZJ is capable of changing the switching state of the second circuit breaker K2. A current limiting resistor is connected in series between the end of each stage of switch in the second circuit breaker K2 and the end of each stage of switch of the first circuit breaker VBR electrically connected with the end of each stage of switch. When the second circuit breaker K2 is switched on and the first circuit breaker K1 is switched off, at the moment, three phase line power supply voltages are all loaded on the plurality of current limiting resistors, at the moment, weak currents of a few milliamperes can be generated at the front end of the rectifier bridge 1, and the weak currents can be consumed on the plurality of current limiting resistors in a heat energy mode, so that personal safety accidents are not easy to cause. In order to realize the function of the current-limiting resistor breaking unit 2, the resistance value and the power of the current-limiting resistor have certain design requirements, and the resistance power on the resistor plate can meet the heating use requirement of the resistor and can be normally used in a time period when three phase lines are all short-circuited. The accident of severe short circuit is not caused, and the personal safety problem is caused.
Referring to fig. 3 and 4, the closing control unit 3 includes a second switch jd_2 and a first relay VBR, the second switch jd_2 is controlled by the detection control unit, one end of the second switch jd_2 is electrically connected to one end of the first relay VBR, and the first relay VBR can control the opening and closing state of the first circuit breaker K1. When the second switch jd_2 is closed, the first relay VBR is triggered, so that the first breaker K1 is closed, and the AC power output by the AC power supply AC can be normally input to the rectifier bridge 1.
Referring to fig. 4 and 5, the detection control unit includes a detection control board 4, and a power supply terminal DC, a first signal input terminal IN1, a second signal input terminal IN2, a first signal output terminal OU1, a second signal output terminal OU2, and a third signal output terminal OU3 are provided on the detection control board 4. The related staff inputs the input signal of the current-limiting circuit breaking unit through the first signal input end IN1, and the first signal output end OUT1 receives the input signal and controls the first switch JD_1 to be closed, so that the second relay VZJ is triggered to enable the second breaker K2 to be closed, and the current-limiting circuit breaking unit is enabled to be effective.
When the current-limiting circuit breaking unit is put into operation, the rectifier bridge 1 unit outputs a KP detection result signal to the second signal input end IN2 through the KP thyristor state signal detection system, and the second signal output end OUT2 receives the KP detection result signal and controls the closing control unit 3. If the KP detection result signal is normal and has no breakdown, the second signal output end OUT2 controls the second switch JD_2 to be closed, so that the first relay K1 is triggered to enable the first breaker K1 to be switched on, and the input end of the rectifier bridge 1 unit can be electrically connected with the output end of the alternating current power supply; if the KP detection result signal is breakdown, the second signal output end OUT2 does not output a signal for controlling the second switch K2, and at this time, the first relay K1 is opened to protect the rectifying system. And when the KP detection result signal is breakdown, the detection control board 4 outputs a fault signal through the third signal output end OU3, so as to prompt related staff to overhaul. Whether the KP thyristor state on the rectifying bridge arm is in a breakdown state or a normal state, the signal of the current-limiting resistor breaking unit 2 is only maintained for a few seconds through a timing module in the detection control unit, and the current-limiting resistor breaking unit automatically exits after the time is up, so that potential safety hazards caused by excessive heating of the current-limiting resistor are prevented as much as possible.
Referring to fig. 5, a detection switch test_pos is connected IN series between the first signal input terminal IN1 and the second signal output terminal OU 2. When the detection switch test_pos is closed, the first signal input end IN1 receives the input signal and directly controls the first circuit breaker to be closed through the second signal output end OU2, so that the detection pre-detection device can work normally.
The implementation principle of the KP silicon controlled rectifier pre-detection device in the embodiment of the utility model is as follows: before the first breaker K1 is switched on, a current-limiting resistance circuit-breaking unit 2 is firstly put into operation through a detection control unit, and alternating current of a three-phase alternating current power supply is led into a rectifier bridge 1 through the current-limiting resistance circuit-breaking unit 2; when the silicon controlled rectifier is in a breakdown state, the three-phase short circuit phenomenon occurs in the rectifier bridge 1, and due to the existence of the current-limiting resistor breaking unit 2, the three-phase incoming line power supply is fully loaded on the current-limiting resistor, and at the moment, the electric energy at the front end of the rectifier bridge 1 is consumed in the form of heat energy on the current-limiting resistor, so that personal safety accidents are not easy to cause; when the silicon controlled rectifier is in an undeployed state, the first circuit breaker K1 is normally switched on, and at the moment, the alternating current power supply can normally transmit power to the rectifier bridge 1; through the structure, the break down of the KP thyristor can be checked before the rectifier bridge 1 is switched on by the first breaker K1, and the malignant short-circuit accident caused by direct power transmission is avoided.
The above embodiments are not intended to limit the scope of the present utility model, so: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.
Claims (8)
1. KP silicon controlled rectifier pre-examination device is based on alternating current power supply and rectifier bridge (1), establish ties between alternating current power supply's the output and rectifier bridge (1) input has a circuit breaker, its characterized in that: the switching-on control device comprises a detection control unit, a current-limiting resistor switching-off unit (2) and a switching-on control unit (3), wherein the first circuit breaker is controlled to be connected with the switching-on control unit (3), the current-limiting resistor switching-off unit (2) is connected in parallel with two ends of the first circuit breaker, the rectifier bridge (1) outputs KP detection result signals to the detection control unit, and the current-limiting resistor switching-off unit (2) and the switching-on control unit (3) are controlled to be connected with the detection control unit.
2. A KP thyristor pre-test device according to claim 1, wherein: the current limiting resistor breaking unit (2) comprises second circuit breakers, two ends of each second circuit breaker are connected in parallel with two ends of the first circuit breaker, and a current limiting resistor is connected in series between the end part of each second circuit breaker and the end part of the first circuit breaker electrically connected with the end part.
3. A KP thyristor pre-test device according to claim 2, wherein: the current-limiting resistor breaking unit (2) further comprises a first switch and a second relay, the first switch is controlled by the detection control unit, the first switch is used for controlling the second relay, and the second relay is used for controlling the opening and closing state of the second breaker.
4. A KP thyristor pre-test device according to claim 3, wherein: the switching-on control unit (3) comprises a second switch and a first relay, the second switch is controlled by the detection control unit, the second switch is used for controlling the first relay, and the first relay is used for controlling the switching-on and switching-off state of the first circuit breaker.
5. A KP thyristor pre-test device according to claim 1, wherein: the detection control unit comprises a detection control board (4), and a first signal input end and a first signal output end are arranged on the detection control board (4); the first signal input end is used for outputting a throwing signal of the current-limiting resistance circuit-breaking unit (2), and the first signal output end is used for receiving the throwing signal and controlling the current-limiting resistance circuit-breaking unit (2).
6. The KP thyristor pre-test device according to claim 5, wherein: the detection control board (4) is further provided with a second signal input end and a second signal output end, the second signal input end is used for receiving the KP detection result signal, and the second signal output end controls the closing control unit (3) according to the KP detection result signal.
7. The KP thyristor pre-test device according to claim 6, wherein: the detection control board (4) is provided with a third signal output end for outputting fault signals.
8. A KP thyristor pre-test device according to claim 6 or 7, wherein: and a test switch is connected in series between the first signal input end and the second signal output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321266383.8U CN219576644U (en) | 2023-05-23 | 2023-05-23 | KP silicon controlled rectifier pre-detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321266383.8U CN219576644U (en) | 2023-05-23 | 2023-05-23 | KP silicon controlled rectifier pre-detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219576644U true CN219576644U (en) | 2023-08-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321266383.8U Active CN219576644U (en) | 2023-05-23 | 2023-05-23 | KP silicon controlled rectifier pre-detection device |
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| CN (1) | CN219576644U (en) |
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2023
- 2023-05-23 CN CN202321266383.8U patent/CN219576644U/en active Active
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