CN219179517U

CN219179517U - Charging detection device for user field 10kV high-voltage frequency converter power unit

Info

Publication number: CN219179517U
Application number: CN202320395124.9U
Authority: CN
Inventors: 李凌飞; 刘法斌; 杜好慧; 杜振祥; 王海祖; 刘俊宝
Original assignee: Xinjiang Xinlianxin Energy Chemical Co ltd
Current assignee: Xinjiang Xinlianxin Energy Chemical Co ltd
Priority date: 2023-03-06
Filing date: 2023-03-06
Publication date: 2023-06-13
Anticipated expiration: 2033-03-06

Abstract

The utility model relates to the technical field of instrument and meter measurement, in particular to a charging detection device for a 10kV high-voltage frequency converter power unit on a user site, which comprises a main circuit and a control circuit, wherein the main circuit comprises a contactor, a voltage regulator and an isolation transformer; the control circuit comprises a start button, a stop button, a coil of the contactor and a normally open auxiliary contact of the contactor. The utility model can effectively carry out charge detection on the 10kV frequency converter power unit module, judge the integrity of the unit, periodically charge and discharge the high-power capacitor, prolong the service life of the capacitor, make up the gap that a user cannot carry out charge detection on the high-voltage frequency converter power unit on site, and have the advantages of simplicity, feasibility, safety, reliability, convenient use and easy realization.

Description

Charging detection device for user field 10kV high-voltage frequency converter power unit

Technical Field

The utility model relates to the technical field of instrument and meter measurement, in particular to a charging detection device for a user field 10kV high-voltage frequency converter power unit.

Background

The power unit is an important main loop component of the high-voltage frequency converter, the frequency conversion speed regulation function of the high-voltage frequency converter is realized through the rectifying circuit, the filtering circuit and the inverter circuit, and the power unit is the main loop component with highest fault frequency of the frequency converter. Meanwhile, for spare parts units stored for a long time, the internal high-power capacitor of the spare parts units needs to be charged and discharged every year so as to reduce the rate of capacitor performance degradation.

However, in each large chemical industry across the country, there is no device dedicated for power unit charge detection and capacitor charge/discharge, and it is necessary to install a power unit to a frequency converter and test the power unit with high voltage, and on-line detection cannot be achieved for a continuous production system, resulting in high detection cost and high maintenance difficulty of the power unit.

Therefore, in the user field, the power unit of the 10kV high-voltage frequency converter cannot realize off-line charging detection, and the high-power capacitor in the power unit stored for a long time cannot be charged and discharged periodically.

Disclosure of Invention

The utility model provides a charging detection device for a 10kV high-voltage frequency converter power unit on a user site, which overcomes the defects of the prior art, and can effectively solve the problems that the 10kV high-voltage frequency converter power unit cannot realize off-line charging detection and a large-power capacitor in the power unit stored for a long time cannot be charged and discharged periodically.

The technical scheme of the utility model is realized by the following measures: a charge detection device for a user field 10kV high-voltage frequency converter power unit comprises a main circuit and a control circuit;

the main circuit comprises a main contact of the contactor, a voltage regulator and an isolation transformer, wherein the wire inlet end of the main contact of the contactor is connected with a power supply, the wire outlet end of the main contact of the contactor is connected with the wire inlet end of the voltage regulator, the wire outlet end of the voltage regulator is connected with the wire inlet end of the isolation transformer, and the wire outlet end of the isolation transformer is connected to the power unit;

the control circuit comprises a start button, a stop button, a coil of the contactor and a normally open auxiliary contact of the contactor, wherein the normally open auxiliary contact of the start button, the normally closed auxiliary contact of the stop button and the coil of the contactor are sequentially connected in series, and the normally open auxiliary contact of the contactor is connected with the normally open auxiliary contact of the start button in parallel.

The following are further optimizations and/or improvements to the above-described inventive solution:

a fuse may also be provided, the fuse being arranged in series in the main circuit.

And a voltmeter and an ammeter can be arranged at the outlet end of the isolation transformer.

A start indicator lamp can be further arranged and connected with the normally open auxiliary contact of the contactor in series.

A stop indicator lamp can be further arranged and connected with the normally closed auxiliary contact of the contactor in series.

The utility model can effectively carry out charge detection on the 10kV frequency converter power unit module, judge the integrity of the unit, periodically charge and discharge the high-power capacitor, prolong the service life of the capacitor and make up for the gap that a user cannot carry out charge detection on the high-voltage frequency converter power unit on site. The device simulates the actual voltage working condition of the power unit when the 10kV frequency converter normally operates by adjusting the input voltage of the power unit, and performs charging detection on the power unit, so that the device has obvious effects in fault detection, component performance detection and integrity detection. The high-power capacitor in the standby unit stored for a long time can be periodically charged and discharged, and the capacity performance reduction rate is reduced. The device is suitable for online detection of various 10kV frequency converter power units, is simple and feasible, is safe and reliable, is convenient to use, and is easy to realize.

Drawings

Fig. 1 is a schematic diagram of an embodiment of the present utility model.

Fig. 2 is a schematic structural diagram of a voltage regulator according to an embodiment of the present utility model.

Fig. 3 is a schematic structural diagram of the front surface of the control box according to an embodiment of the present utility model.

Fig. 4 is a schematic structural diagram of the back of the control box according to an embodiment of the present utility model.

The codes in the drawings are respectively: PV is the voltmeter, PA is the ammeter, HR is the start indicator, HG is the stop indicator, SB1 is the start button, SB2 is the stop button, TM is the isolation transformer, QF1 through QF2 are the circuit breaker, FU is the fuse, KMZ is the contactor main contact, KMXQ is the contactor coil, KMCK1 and KMCK2 are contactor normally open contacts, KMCB1 is the contactor normally closed contact, TT is the voltage regulator, PCU is the power unit, TS is the voltage regulating handle, PE is the ground terminal.

Detailed Description

The present utility model is not limited by the following examples, and specific embodiments can be determined according to the technical scheme and practical situations of the present utility model.

In the present utility model, for convenience of description, the description of the relative positional relationship of each component is described according to the layout manner of the drawings in the specification, such as: the positional relationship of the front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of the drawings of the specification.

The utility model is further described below with reference to examples and figures:

example 1: as shown in fig. 1, 2, 3 and 4, the charging detection device for the user field 10kV high-voltage frequency converter power unit PCU comprises a main circuit and a control circuit; the main circuit comprises a contactor main contact KMZ, a voltage regulator TT and an isolation transformer TM, wherein the wire inlet end of the contactor main contact KMZ is connected with a power supply, the wire outlet end of the contactor main contact KMZ is connected with the wire inlet end of the voltage regulator TT, the wire outlet end of the voltage regulator TT is connected with the wire inlet end of the isolation transformer TM, and the wire outlet end of the isolation transformer TM is connected to a power unit PCU; the control circuit comprises a start button SB1, a stop button SB2, a coil of a contactor and a normally open auxiliary contact of the contactor, wherein the normally open auxiliary contact of the start button SB1, the normally closed auxiliary contact of the stop button SB2 and the coil of the contactor are sequentially connected in series, and the normally open auxiliary contact of the contactor is connected in parallel with the normally open auxiliary contact of the start button SB 1.

In this embodiment, a fuse FU may be further provided, and the fuse FU is disposed in series in the main circuit for overcurrent protection in the operation of the device, preventing damage to the device and the unit. A voltmeter PV and an ammeter PA may be provided at the outlet end of the isolation transformer TM for detecting the input voltage and input current of the power unit PCU. A start indicator lamp HR can also be arranged, and the start indicator lamp HR is connected in series with the normally open auxiliary contact of the contactor. A stop indicator light HG can also be arranged, and the stop indicator light HG is connected in series with the normally closed auxiliary contact of the contactor.

When the device is specifically implemented, the device can comprise a control box and a voltage regulator TT, and the two boxes are electrically connected to form the whole device. In fig. 4, a1 to a3, b1 to b3, c1 to c3, and n1 to n3 are three-phase input/output terminals. In fig. 2, A, B, C is a three-phase input terminal, a, b, and c are three-phase output terminals, N is a working zero terminal, and a ground terminal PE is attached. The adjustable voltage of the voltage regulator TT can be adjusted from 0 to the rated voltage range of the power unit PCU, the operating condition of the power unit PCU can be simulated to charge and detect the power unit PCU when the frequency converter normally operates, and meanwhile, the internal capacitor can be charged and discharged as required. The control circuit uses a circuit breaker QF2 for short-circuit protection.

During operation, 380V three-phase alternating current is sent to a voltage regulator TT through a breaker QF1, a fuse FU and a contactor, wherein the contactor is connected with terminals a1, b1, c1, n1 and A, B, C, N through three-phase four-wire cables, and then the voltage regulator TT is connected with a power unit PCU through an isolation transformer TM, and the voltage regulator TT is connected with terminals a2, b2, c2 and n2 through three-phase four-wire cables. The on-off of the main loop of the contactor is realized by a secondary control loop to start self-locking and stop disconnection. Pressing start button SB1, contactor coil KMXQ gets the electricity actuation, contactor main contact KMZ is closed and makes main loop intercommunication, contactor normally open contact KMCK1 and KMCK2 action auto-lock are closed, contactor normally closed contact KMCB1 action disconnection, start-up pilot lamp HR is bright, stop pilot lamp HG is extinguished, three-phase alternating current passes through voltage regulator TT voltage regulation, isolation transformer TM electrical isolation conveys to power unit PCU, and accessible voltage regulator TT's voltage regulating handle TS carries out rising or reduces output voltage, in order to satisfy power unit PCU rated capacity's voltage demand. When the stop button SB2 is pressed, the contactor coil KMXQ is in power-off disconnection, the main circuit is disconnected by the disconnection of the contactor main contact KMZ, the normally-open contacts KMCK1 and KMCK2 of the contactor are recovered to be disconnected, the normally-closed contact KMCB1 of the contactor is recovered to be closed, the starting indicator lamp HR is extinguished, the stopping indicator lamp HG is on, the three-phase alternating current is disconnected, and the device stops working.

The utility model provides a device for a user to charge and detect a power unit PCU module of a 10kV frequency converter and charge and discharge a high-power capacitor on site, which provides an adjustable voltage within a rated voltage range for the power unit PCU by adopting a mode of safety isolation of an isolation transformer TM and voltage regulation of a voltage regulator TT, simulates the operation working condition of the power unit PCU when the frequency converter normally operates, carries out offline charge detection on the power unit PCU, judges the integrity of the unit and the failure cause, and can periodically charge and discharge the capacitor at the same time so as to prolong the service life of the capacitor. The output voltage of the device can be adjusted within the rated voltage range of the power unit PCU, and the actual operation condition of the power unit PCU is simulated when the frequency converter normally operates. The isolation transformer TM enables secondary complete electrical isolation, improves safety, and simultaneously inhibits damage to components caused by high-frequency clutter transferred into the power unit PCU. The pointer voltmeter PV and the ammeter PA are arranged at the output end of the device, so that the change of the bearing voltage of the unit can be visually observed, and the integrity and the problem of the unit can be conveniently judged according to the operation working condition. The internal capacitance of the cell can be periodically charged and discharged by adjusting the voltage according to the capacity of the cell.

The utility model can effectively carry out charge detection on the PCU module of the power unit of the 10kV frequency converter, judge the integrity of the unit, periodically charge and discharge a high-power capacitor, prolong the service life of the capacitor and make up for the gap that a user cannot carry out charge detection on the PCU of the power unit of the high-voltage frequency converter on site. The device simulates the actual voltage working condition of the power unit PCU when the 10kV frequency converter normally operates by adjusting the input voltage of the power unit PCU, and performs charging detection on the power unit, so that the device has obvious effects in fault detection, component performance detection and integrity detection. The high-power capacitor in the standby unit stored for a long time can be periodically charged and discharged, and the capacity performance reduction rate is reduced. The device is suitable for online detection of various 10kV frequency converter power units PCU, is simple and feasible, safe and reliable, is convenient to use and is easy to realize.

The technical characteristics form the embodiment of the utility model, have stronger adaptability and implementation effect, and can increase or decrease unnecessary technical characteristics according to actual needs so as to meet the requirements of different situations.

Claims

1. The charging detection device for the power unit of the user field 10kV high-voltage frequency converter is characterized by comprising a main circuit and a control circuit;

2. The charging detection apparatus for a consumer field 10kV high voltage inverter power unit of claim 1, further comprising a fuse disposed in series in the main circuit.

3. The charging detection device for a 10kV high-voltage frequency converter power unit on a consumer site according to claim 1 or 2, characterized in that a voltmeter and an ammeter are provided at the outlet end of the isolation transformer.

4. The charging detection apparatus for a user field 10kV high voltage inverter power unit according to claim 1 or 2, further characterized by a start indicator, the start indicator being connected in series with a normally open auxiliary contact of the contactor.

5. A charging detection arrangement for a consumer field 10kV high voltage converter power unit according to claim 3, characterized by further provided with a start indicator lamp connected in series with the normally open auxiliary contact of the contactor.

6. The charge detection device for a user field 10kV high voltage inverter power unit according to claim 1 or 2 or 5, characterized by further providing a stop indicator lamp, the stop indicator lamp being connected in series with the normally closed auxiliary contact of the contactor.

7. A charging detection arrangement for a consumer field 10kV high voltage inverter power unit according to claim 3, further provided with a stop indicator lamp connected in series with the normally closed auxiliary contact of the contactor.