CN210629347U - Power-on test protection device for unit body of high-voltage frequency converter - Google Patents
Power-on test protection device for unit body of high-voltage frequency converter Download PDFInfo
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- CN210629347U CN210629347U CN201921508800.9U CN201921508800U CN210629347U CN 210629347 U CN210629347 U CN 210629347U CN 201921508800 U CN201921508800 U CN 201921508800U CN 210629347 U CN210629347 U CN 210629347U
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Abstract
The utility model relates to a high-voltage frequency converter unit body power-on test protection device, which comprises a circuit breaker, a contactor, three current-limiting resistors and three indicator lamps; the circuit breaker at least comprises three parallel circuit breaker switches, and the contactor at least comprises three parallel contactor main contacts; each current-limiting resistor is connected with a main contact of the contactor and an indicator lamp in parallel, one end of each current-limiting resistor is connected with a breaker switch, the other end of each current-limiting resistor is connected with the high-frequency transformer unit body, and the other end of each breaker switch is connected with a power supply. The utility model discloses for high-voltage inverter cell cube charging process is through entering current-limiting resistor in the charging circuit cluster, with the charging current restriction in certain within range, makes the last electric voltage of high-voltage inverter cell cube slowly rise, prevents that voltage from rising to cause the impact to the high-voltage inverter cell cube too fast, plays voltage surge protection.
Description
Technical Field
The utility model relates to a high-voltage inverter field especially relates to a high-voltage inverter is electric test protection device on cell cube.
Background
With the wide popularization of energy-saving technology, the application of high-voltage frequency converters in industrial and mining enterprises is more and more common. Due to the influence of factors such as operation time and environmental conditions, the fault rate of the high-voltage frequency converter is improved year by year, 80% of faults of the high-voltage frequency converter are concentrated on a key component, namely a power unit, of the high-voltage frequency converter, and the high-voltage frequency converter plays an important role in the process flow of modern industrial and mining enterprises, so that the requirement on the timeliness of fault recovery of the high-voltage frequency converter is higher and higher, the faults are further expanded due to blind electrification, and the timeliness is difficult to guarantee. The power-on test protection device for the high-voltage frequency converter unit body is developed for preventing the high-voltage frequency converter power unit from working under the conditions that a driving circuit is in fault, an IGBT is in fault, an external short circuit or an overcurrent state to further enlarge the fault, and simultaneously preventing personal injury and further damage of the power unit caused by the enlargement of the fault.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve the above-mentioned weak point that exists among the prior art.
In order to achieve the above object, an embodiment of the present invention provides a power-on test protection device for a high-voltage inverter unit, which includes a circuit breaker, a contactor, three current-limiting resistors, and three indicator lights; the circuit breaker at least comprises three parallel circuit breaker switches, and the contactor at least comprises three parallel contactor main contacts; each current-limiting resistor is connected with a main contact of the contactor and an indicator lamp in parallel, one end of each current-limiting resistor is connected with a breaker switch, the other end of each current-limiting resistor is connected with the high-frequency transformer unit body, and the other end of each breaker switch is connected with a power supply.
In one possible embodiment, the voltage of the power supply has a magnitude of 690V.
In one possible embodiment, the circuit breaker is model NM 1-63S/50A.
In one possible embodiment, the contactor is model number CJX 2-65.
The utility model discloses for high-voltage inverter cell cube charging process is through entering current-limiting resistor in the charging circuit cluster, with the charging current restriction in certain within range, makes the last electric voltage of high-voltage inverter cell cube slowly rise, prevents that voltage from rising to cause the impact to the high-voltage inverter cell cube too fast, plays voltage surge protection.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of the working principle of a power-on test protection device for a unit body of a high-voltage frequency converter;
description of reference numerals:
the device comprises a 1-circuit breaker, a 2-contactor, a 3-current limiting resistor module, a 4-indicator lamp module and a 5-high-frequency transformer unit body.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to the accompanying drawings and embodiments.
Referring to fig. 1, an embodiment of the present invention provides a power-on test protection device for a high-voltage inverter unit, which includes a circuit breaker 1, a contactor 2, a current-limiting resistance module 3, an indicator light module 4,
the breaker QF comprises at least three parallel breaker switches, namely a first breaker switch K1, a second breaker switch K2 and a third breaker switch K3.
The contactor KM at least comprises three parallel contactor main contacts, namely a first contactor main contact K4, a second contactor main contact K5 and a third contactor main contact K6.
The first current limiting resistor R1 is connected with the first contactor main contact K4 and the first indicator lamp HR1 in parallel, one end of the first current limiting resistor R1 is connected with the first breaker switch K1, the other end of the first current limiting resistor R1 is connected with the high-frequency transformer unit, and the other end of the first breaker switch K1 is connected with a power supply.
The second current limiting resistor R2 is connected in parallel with the second contactor main contact K5 and the second indicator light HR2, one end of the second current limiting resistor R2 is connected with the second breaker switch K2, the other end of the second current limiting resistor R2 is connected with the high-frequency transformer unit, and the other end of the second breaker switch K2 is connected with a power supply.
The third current limiting resistor R3 is connected in parallel with the third contactor main contact K6 and the third indicator light HR3, one end of the third current limiting resistor R3 is connected with the third breaker switch K3, the other end of the third current limiting resistor R3 is connected with the high-frequency transformer unit, and the other end of the third breaker switch K3 is connected with the power supply.
In one example, the voltage of the power supply is 690V in magnitude.
In one example, the model number of the circuit breaker is NM 1-63S/50A.
In one example, the contactor is model number CJX 2-65.
The working principle is as follows:
1) before the high-voltage frequency converter unit body is electrified and tested, the contactor 2 is ensured to be uncharged, namely a normally open contact of the contactor is in a disconnected state.
2) The circuit breaker 1 is closed, the high-voltage frequency converter unit body 5 starts to be charged, and the voltage of the high-voltage frequency converter unit body 5 gradually rises along with the lapse of time.
3) In the charging process of the high-voltage frequency converter unit body 5, the charging loop is charged through the current-limiting resistance module and indicated by the indicator lamp module 4, and the indicator lamp module 4 gradually turns on or off along with the charging time.
4) When the voltage of the high-voltage frequency converter unit body reaches the amplitude of the input voltage, the voltage between two end points of the current-limiting resistor is zero, the charging current is also zero, the indicator lamp is turned off, and the charging process of the high-voltage frequency converter unit body is completed.
5) When the unit body of the high-voltage frequency converter formally starts to test, the contactor is electrified, namely a normally open contact of the contactor is in a conducting state, and the current-limiting resistor and the indicator lamp of the bypass are in short circuit.
Implementation of protection functions
(1) The charging process of the high-voltage frequency converter unit body is realized by connecting a current-limiting resistor in a charging loop in series, so that the charging current is limited within a certain range, the upper voltage of the high-voltage frequency converter unit body slowly rises, the voltage is prevented from rising too fast to cause impact on the high-voltage frequency converter unit body, and voltage impact protection is realized.
(2) High-voltage inverter cell cube fault state, when the rectifier bridge component damaged, probably cause arbitrary two-phase short circuit between the high-voltage inverter cell cube input three-phase, at this moment if directly charge for the converter, the electric current that can cause the input power is very big, when influential to the input power, probably cause high-voltage inverter cell cube fault to enlarge, when adopting the current-limiting resistor of joining in marriage in series, the electric current that has guaranteed the charging circuit is in certain limit value within range, voltage is whole to be added on current-limiting resistor, thereby reach the protection power supply, prevent that high-voltage inverter cell cube fault from enlarging.
(3) High-voltage inverter cell cube fault state, when the inverter bridge component damaged, probably cause arbitrary two-phase short circuit between the high-voltage inverter cell cube output three-phase, at this moment if directly charge for the converter, the electric current that can cause input power is very big, when having an effect to input power, probably cause high-voltage inverter cell cube fault to enlarge, when adopting the current-limiting resistor of joining in marriage in series, the electric current that has guaranteed the charging circuit is in certain limit value within range, voltage is whole to be added on current-limiting resistor, thereby reach the protection power supply, prevent that high-voltage inverter cell cube fault from enlarging.
The above embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above embodiments are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. A high-voltage frequency converter unit body power-on test protection device is characterized by comprising a circuit breaker, a contactor, three current-limiting resistors and three indicator lamps;
the circuit breaker at least comprises three parallel circuit breaker switches, and the contactor at least comprises three parallel contactor main contacts;
each current-limiting resistor is connected with a main contact of the contactor and an indicator lamp in parallel, one end of each current-limiting resistor is connected with a breaker switch, the other end of each current-limiting resistor is connected with the high-frequency transformer unit body, and the other end of each breaker switch is connected with a power supply.
2. The unit body electricity test protection device of high-voltage frequency converter according to claim 1, characterized in that the amplitude of the voltage of the power supply is 690V.
3. The unit body power-on test protection device of the high-voltage frequency converter according to claim 1, wherein the model of the circuit breaker is NM 1-63S/50A.
4. The power-on test protection device for the high-voltage frequency converter unit body as claimed in claim 1, wherein the contactor has a model number of CJX 2-65.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921508800.9U CN210629347U (en) | 2019-09-09 | 2019-09-09 | Power-on test protection device for unit body of high-voltage frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921508800.9U CN210629347U (en) | 2019-09-09 | 2019-09-09 | Power-on test protection device for unit body of high-voltage frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210629347U true CN210629347U (en) | 2020-05-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921508800.9U Active CN210629347U (en) | 2019-09-09 | 2019-09-09 | Power-on test protection device for unit body of high-voltage frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210629347U (en) |
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2019
- 2019-09-09 CN CN201921508800.9U patent/CN210629347U/en active Active
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