CN108757420A - The device and implementation method of inspection are carried out to high-voltage electric fire pump using low tension - Google Patents
The device and implementation method of inspection are carried out to high-voltage electric fire pump using low tension Download PDFInfo
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- CN108757420A CN108757420A CN201810557049.5A CN201810557049A CN108757420A CN 108757420 A CN108757420 A CN 108757420A CN 201810557049 A CN201810557049 A CN 201810557049A CN 108757420 A CN108757420 A CN 108757420A
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- voltage
- frequency
- vacuum contactor
- pressure vacuum
- fire pump
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
Abstract
A kind of device and implementation method carrying out inspection to high-voltage electric fire pump using low tension, when high-voltage electric fire pump declared working condition is run, II major loop of high-pressure vacuum contactor is closed, I major loop of high-pressure vacuum contactor disconnects, and three-phase main-frequency high voltage power supply accesses the declared working condition operation under the conditions of high-voltage electric fire pump progress rated voltage, rated speed；When high-voltage electric fire pump low pressure low speed inspection, I major loop of high-pressure vacuum contactor is closed, II major loop of high-pressure vacuum contactor disconnects, it is 5Hz/38V that 50Hz/380V three-phase main-frequencies low-tension supply is depressured frequency reducing by frequency reducing module, 5Hz/1kV or 5Hz/0.6kV are boosted to by three-phase voltage increasing transformer again, working voltage≤1kV, the low pressure low speed inspection of the rated speed of running speed≤1/10 are carried out to high-voltage electric fire pump.While substantially reducing use cost, loine pressure when effectively reducing inspection plays the purpose of protection protection fire_fighting pipe network.
Description
Technical field
The present invention relates to a kind of high-tension motor low pressure low speed running technologies, and in particular to a kind of to use low tension to high pressure
Electric-drive fire pump carries out the device and implementation method of inspection.
Technical background
Motor fire pump is generally made of motor (prime mover), pump head and other attachmentes, is structural fire protection pipe network
It supplies water, is the heart of entire fire supply system, with the increase of the building scale of construction, the power of motor fire pump adapted motor
Constantly increase, and the high-voltage electric fire pump ratio of adapted high pressure (10kV or 6kV) motor is higher and higher.
Motor fire pump is daily to be chronically at stand-by state, only occurs just to come into operation when fire alarm, and long-term spare
Standing can lead to impeller corrosion interim card, and the accident that fire pump can not start when can lead to occur fire alarm when serious causes to be difficult to draw
The personnel that return, property loss, therefore the related mandatory code requirement motor fire pump in China will carry out inspection, and when inspection makes to disappear
Anti- impeller of pump rotation, examines the operating status of fire pump, prevents corrosion interim card, to ensure the normal operation of fire pump.
The inspection of motor fire pump generally by regular declared working condition operation (being run under rated voltage, rated speed) and
Frequency converter frequency reducing operation is automatically controlled to realize, fire-fighting pump discharge pressure is rated pressure, frequency reducing when wherein declared working condition is run
Since fire-fighting revolution speed reduces when operation, outlet pressure is much smaller than rated pressure.
For high-voltage electric fire pump, since its flow lift is larger, according to the routine inspection mode of declared working condition operation, disappear
Anti- pump discharge pressure is high, and frequent starting can cause greater impact to fire_fighting pipe network, fire supply system superpressure can be caused when serious,
Lead to pipe network explosion and fire supply system failure, causes heavy losses.
And high-voltage electric fire pump then needs to increase frequency converter input according to frequency converter frequency reducing inspection, especially high pressure is big
Power inverter involves great expense, and can greatly increase use cost.
Therefore, problem of the existing technology can restrict the execution of related specifications, and hidden fire-fighting danger can be caused when serious, dangerous
Personnel and property safety.
Invention content
In view of the problems existing in the prior art, high-voltage electric fire pump is carried out using low tension the present invention provides a kind of
The device and implementation method of inspection can not only meet the service requirement under high-voltage electric fire pump declared working condition, but also may be implemented
To high-voltage electric fire pump working voltage≤1kV, the low pressure low speed inspection of the rated speed of running speed≤1/10 is effectively reduced and is patrolled
Loine pressure when inspection.Frequency reducing module used at the same time is low-voltage accessories and facility with three-phase voltage increasing transformer, and it configures work(
Rate only need to be the 2% of adaptation high-voltage electric fire pump rated power, greatly reduce use cost.
To achieve the above object, used technical solution is the present invention：It is a kind of to use low tension to high-voltage electric fire-fighting
Pump carries out the device of inspection, it is characterised in that：Including frequency reducing module, three-phase voltage increasing transformer, high-pressure vacuum contactor I, high pressure
The reversible A.C. contactor of vacuum contactor II, mechanical interlocking；
The three-phase main-frequency high voltage power supply of 50Hz/10kV or 50Hz/6kV is connected with II major loop input terminal of high-pressure vacuum contactor；
The three-phase main-frequency low-tension supply of 50Hz/380V pass sequentially through after frequency reducing module and three-phase voltage increasing transformer with high-pressure vacuum contactor
I major loop input terminal is connected；
The major loop output end of high-pressure vacuum contactor I and high-pressure vacuum contactor II is connected with high-voltage electric fire pump；
The control circuit of high-pressure vacuum contactor I is connected with 2 foot of output of the reversible A.C. contactor of mechanical interlocking, and high pressure vacuum connects
The control circuit of tentaculum II is connected with 1 foot of output of the reversible A.C. contactor of mechanical interlocking；The reversible A.C. contactor of mechanical interlocking
Input terminal be connected with control circuit power supply；
High-pressure vacuum contactor I and high-pressure vacuum contactor II realize that high pressure vacuum connects by the reversible A.C. contactor of mechanical interlocking
When I major loop of tentaculum is closed, II major loop of high-pressure vacuum contactor disconnects；It is high when II major loop of high-pressure vacuum contactor is closed
The interlock connection for pressing I major loop of vacuum contactor to disconnect.
A kind of implementation method carrying out inspection device to high-voltage electric fire pump using low tension, steps are as follows：
It is reversible by mechanical interlocking when declared working condition of high-voltage electric fire pump under the conditions of rated voltage, rated speed is run
A.C. contactor controls II major loop of high-pressure vacuum contactor and is closed, and I major loop of high-pressure vacuum contactor disconnects, and three-phase main-frequency is high
Voltage source accesses high-voltage electric fire pump by high-pressure vacuum contactor II and carries out declared working condition operation；
When high-voltage electric fire pump low pressure low speed inspection is run, high pressure vacuum is controlled by the reversible A.C. contactor of mechanical interlocking and is connect
I major loop of tentaculum is closed, and II major loop of high-pressure vacuum contactor disconnects, and the three-phase main-frequency low-tension supply of 50Hz/380V passes through drop
Output is 5Hz/38V after frequency module is depressured frequency reducing, then it is 5Hz/1kV or 5Hz/ to be exported after being boosted by three-phase voltage increasing transformer
0.6kV accesses high-voltage electric fire pump finally by high-pressure vacuum contactor I and carries out working voltage≤1kV, running speed≤1/
The low pressure low speed inspection of 10 rated speeds；
Frequency reducing module is the frequency converter of fixed output frequency and voltage characteristic, when low pressure low speed inspection is run, in the startup of 0-t1
In the process, the starting output frequency of frequency reducing module is " 0 ", and start output voltage is 19V；In t1-t2 low pressure low speed inspection processes
In, frequency no-load voltage ratio is 10:1, voltage change ratio is also 10:1；Frequency reducing module can use universal frequency converter and vector controlled is arranged
Mode replaces；The configuration power of frequency reducing module, which is at least, is adapted to the 2% of high-voltage electric fire pump rated power；
When being adapted to the high-voltage electric fire pump of rated voltage 10kV, three-phase main-frequency high voltage power supply is 10kV, three-phase voltage increasing transformer
Boosting no-load voltage ratio be 38：1000, output is 5Hz/1kV；When being adapted to the high-voltage electric fire pump of rated voltage 6kV, three-phase work
Frequency high voltage power supply is 6kV, and the boosting no-load voltage ratio of three-phase voltage increasing transformer is 38：600, output is 5Hz/0.6kV；Three-phase voltage increasing becomes
The configuration power of depressor, which is at least, is adapted to the 2% of high-voltage electric fire pump rated power.
The beneficial effects of the invention are as follows：The present invention is actually asked for existing for fire protection sector high-voltage electric fire pump inspection
Topic provides a kind of device and implementation method carrying out inspection to high-voltage electric fire pump using low tension.Compared with prior art
There are fire-fighting pump discharge pressures when high-voltage electric fire pump declared working condition is run, and high, fire_fighting pipe network impact is patrolled with frequency converter frequency reducing greatly
The high disadvantage of inspection technology use cost, the present invention provide a kind of solution of high performance-price ratio, can meet high-voltage electric fire-fighting
The service requirement under declared working condition is pumped, and directly can carry out low pressure low speed using 50Hz/380V three-phase main-frequency low-tension supplies and patrol
Inspection, while substantially reducing use cost, loine pressure when effectively reducing inspection plays the mesh of protection protection fire_fighting pipe network
's.
Description of the drawings
Fig. 1 is the schematic block circuit diagram of the present invention；
Fig. 2 is the schematic diagram of frequency reducing module frequency/voltage-vs-time relation curve of the present invention.
Specific implementation mode
Embodiment 1：With reference to Fig. 1 and Fig. 2, to implement low pressure low speed inspection to 500kW/10kV high-voltage electric fire pumps
For, the present invention to be further elaborated.
The three-phase main-frequency high voltage power supply 1 of 50Hz/10kV is connected with II 8 major loop input terminal of high-pressure vacuum contactor；50Hz/
380V three-phase main-frequencies low-tension supply 2 passes sequentially through frequency reducing module 3 and three-phase voltage increasing transformer 5 and is led back with high-pressure vacuum contactor I 7
Road input terminal is connected；The major loop output end of high-pressure vacuum contactor II 8 and high-pressure vacuum contactor I 7 and high-voltage electric fire-fighting
Pump 9 is connected.
2 foot of output of the reversible A.C. contactor of the control circuit of high-pressure vacuum contactor I 7 and mechanical interlocking 10 is connected, high
1 foot of output of the reversible A.C. contactor of control circuit and the mechanical interlocking of vacuum contactor II 8 10 is pressed to be connected；Mechanical interlocking is reversible
The input terminal of A.C. contactor 10 is connected with control circuit power supply 11.
High-pressure vacuum contactor I 7 and high-pressure vacuum contactor II 8 realize height by the reversible A.C. contactor of mechanical interlocking 10
When I 7 major loop of vacuum contactor being pressed to be closed, II 8 major loop of high-pressure vacuum contactor disconnects；High-pressure vacuum contactor II 8 is led back
When road is closed, the interlock connection of I 7 major loop of high-pressure vacuum contactor disconnection.
Determine that each parameters of operating part process is as follows：
Rotating speed is the 10% of rated speed when setting the 9 low speed inspection of high-voltage electric fire pump, then according to Rotational Speed of Asynchronous Motor and electricity
Proportional relation between source frequency：
Wherein：fXSupply frequency, Hz,
nMXSupply frequency is fXWhen rotating speed, r/min,
p：For the p=2 of motor number of pole-pairs, such as quadrupole motor,
s：Slip of induction motor,
Determine that the frequency no-load voltage ratio of frequency reducing module (3) is 10:1.
The voltage change ratio of frequency reducing module (3) is determined according to the following equation：
A) the input power calculation formula of threephase motor：
Wherein：PlXSupply frequency is fXWhen input power, kW,
UlXSupply frequency is fXWhen line voltage, V,
IlPhase current, A,
cosΦ1Stator power factor.
(b) motor machine output power：
Wherein：PMXSupply frequency is fXWhen axis on output power, kW,
TMThe torque (balancing each other with load torque) of motor, Ngm,
nMXSupply frequency is fXWhen rotating speed, r/min.
According to formula (a), (b) it is found that in the case where other conditions are constant, supply frequency decline leads to motor speed
Decline, significantly declines so as to cause output power；
And without direct relation between the input power and supply frequency of motor, if therefore only reduce supply frequency, without reducing
Voltage can cause motor reactance capacity to substantially increase, and magnetic flux is significantly increased, and the magnetic circuit of motor will be seriously saturated, and cause to encourage
Magnetoelectricity stream increases sharply and Severe distortion occurs for waveform.
To maintain the balance of input power and output power, supply voltage is reduced while reducing supply frequency, that is, is dropped
Frequency module 3 uses 10:While 1 frequency no-load voltage ratio, using voltage change ratio and 10:1.Simultaneously according to above-mentioned conclusion, setting three
The boosting no-load voltage ratio of phase step-up transformer 5 is 38：1000, then its output is 5Hz/1kV.
In addition using 10:After 1 frequency no-load voltage ratio, the AC impedance of motor can be greatly reduced, be greatly reduced simultaneously
The torque of motor, this will cause motor start-up difficult, and in order to improve detent torque, frequency reducing module 3 has starting voltage
With the nonsynchronous output characteristics of frequency, in Fig. 2,0-t1 is that start-up course t1-t2 is low pressure low speed inspection process, in start-up course
In, the starting output frequency of frequency reducing module 3 is " 0 ", and output starting voltage is 19V, can ensure high-voltage electric fire pump in this way
There is good starting characteristic in low pressure low speed inspection；Meanwhile frequency reducing module 3 can use universal frequency converter and vector is arranged
The mode of control replaces the frequency converter of fixed output frequency and voltage characteristic.
According to the relationship between Centrifugal Pump, lift, shaft power and rotating speed, frequency reducing module 3 and three-phase voltage increasing transformation are determined
The configuration power of device (5)：
Wherein, Q, H, N, n indicate pump capacity, lift, shaft power and rotating speed respectively；
If the running speed of water pump is reduced to 10%, shaft power is rated powerI.e. 1%, but use
10:After 1 frequency no-load voltage ratio, the AC impedance of motor can be greatly reduced, but not influence its D.C. resistance, to will appear with
Lower phenomenon：
1. D.C. resistance makes the copper loss power of motor increase；
2. AC impedance reduction makes the torque of motor significantly reduce, increase so as to cause its revolutional slip；
3. revolutional slip increases, while power factor angle also increases and power factor (PF) is caused to decline, and reactive power increases；
Therefore the configuration power of frequency reducing module 3 and three-phase voltage increasing transformer 5 needs after considering high-voltage electric fire pump frequency reducing use
The increase of motor copper loss power and reactive power, cannot be by the rated power of theoretical calculationI.e. 1% conduct is matched
The foundation of power is set, motor copper loss power and reactive power loss when must increase low frequency inspection operation；
Frequency reducing module 3 and the configuration power of three-phase voltage increasing transformer 5 are at least the 2% of high-voltage electric fire pump rated power, i.e.,
Frequency reducing module 3 and the configuration power of three-phase voltage increasing transformer 5 at least should be 10kW in the present embodiment.
Steps are as follows for carrying out practically：
It is reversible by mechanical interlocking when declared working condition of the high-voltage electric fire pump 9 under the conditions of rated voltage, rated speed is run
A.C. contactor 10 controls II 8 major loop of high-pressure vacuum contactor and is closed, and I 7 major loop of high-pressure vacuum contactor disconnects, three-phase work
Frequency high voltage power supply 1 accesses high-voltage electric fire pump 9 by high-pressure vacuum contactor II 8 and carries out declared working condition operation.
When the 9 low pressure low speed inspection of high-voltage electric fire pump is run, height is controlled by the reversible A.C. contactor of mechanical interlocking 10
I 7 major loop of vacuum contactor is pressed to be closed, II 8 major loop of high-pressure vacuum contactor disconnects, the three-phase main-frequency low pressure of 50Hz/380V
Output 4 is 5Hz/38V after power supply 2 is depressured frequency reducing by frequency reducing module 3, then by exporting 6 after three-phase voltage increasing transformer 5 as 5Hz/
1kV accesses high-voltage electric fire pump 9 finally by high-pressure vacuum contactor I 7 and carries out working voltage 1kV, running speed≤1/10
The low pressure low speed inspection of rated speed.
Embodiment 2：With reference to Fig. 1 and Fig. 2, to implement low pressure low speed inspection to 300kW/6kV high-voltage electric fire pumps
For, the present invention to be further elaborated.
Embodiment 2 is identical as 1 circuit theory of embodiment, parameters of operating part determination process and operating procedure, difference lies in：
Three-phase main-frequency high voltage power supply 1 is 50Hz/6kV；The boosting no-load voltage ratio of three-phase voltage increasing transformer 5 is 38：600, exporting 6 is
5Hz/0.6kV；Frequency reducing module 3 and the configuration power of three-phase voltage increasing transformer 5 at least should be 6kW；9 low pressure of high-voltage electric fire pump
Working voltage 0.6kV when low speed inspection is run, the rated speed of running speed≤1/10.
II 8 model of high-pressure vacuum contactor I 7 and high-pressure vacuum contactor：CKG4 or JCZ5.
The model of the reversible A.C. contactor of mechanical interlocking 10：CJX2-NF.
A kind of use low tension that above-described embodiment only is used for further illustrating the present invention carries out high-voltage electric fire pump
The device and implementation method of inspection, but the invention is not limited in embodiments, it is every according to the technical essence of the invention to above
Any simple modification, equivalent change and modification made by embodiment, each fall in the protection domain of technical solution of the present invention.
Claims (2)
1. a kind of device carrying out inspection to high-voltage electric fire pump using low tension, it is characterised in that：Including frequency reducing module
（3）, three-phase voltage increasing transformer（5）, high-pressure vacuum contactor I（7）, high-pressure vacuum contactor II（8）, the reversible exchange of mechanical interlocking
Contactor（10）；
The three-phase main-frequency high voltage power supply of 50Hz/10kV or 50Hz/6kV（1）With high-pressure vacuum contactor II（8）Major loop input terminal
It is connected；The three-phase main-frequency low-tension supply of 50Hz/380V（2）Pass sequentially through frequency reducing module（3）With three-phase voltage increasing transformer（5）Afterwards with
High-pressure vacuum contactor I（7）Major loop input terminal is connected；
High-pressure vacuum contactor I（7）With high-pressure vacuum contactor II（8）Major loop output end and high-voltage electric fire pump（9）
It is connected；
High-pressure vacuum contactor I（7）Control circuit and the reversible A.C. contactor of mechanical interlocking（10）2 foot of output be connected, it is high
Press vacuum contactor II（8）Control circuit and the reversible A.C. contactor of mechanical interlocking（10）1 foot of output be connected；Mechanical interlocking
Reversible A.C. contactor（10）Input terminal and control circuit power supply（11）It is connected；
High-pressure vacuum contactor I（7）With high-pressure vacuum contactor II（8）Pass through the reversible A.C. contactor of mechanical interlocking（10）It realizes
High-pressure vacuum contactor I（7）When major loop is closed, high-pressure vacuum contactor II（8）Major loop disconnects；High-pressure vacuum contactor II
（8）When major loop is closed, high-pressure vacuum contactor I（7）The interlock connection that major loop disconnects.
2. a kind of implementation method carrying out inspection device to high-voltage electric fire pump using low tension described in claim 1, step
It is rapid as follows：
High-voltage electric fire pump（9）It, can by mechanical interlocking when declared working condition under the conditions of rated voltage, rated speed is run
Inverse A.C. contactor（10）Control high-pressure vacuum contactor II（8）Major loop is closed, high-pressure vacuum contactor I（7）Major loop is disconnected
It opens, three-phase main-frequency high voltage power supply（1）Pass through high-pressure vacuum contactor II（8）Access high-voltage electric fire pump（9）Carry out specified work
Condition is run；
High-voltage electric fire pump（9）When low pressure low speed inspection is run, pass through the reversible A.C. contactor of mechanical interlocking（10）Control is high
Press vacuum contactor I（7）Major loop is closed, high-pressure vacuum contactor II（8）Major loop disconnects, the three-phase main-frequency of 50Hz/380V
Low-tension supply（2）Pass through frequency reducing module（3）It is exported after decompression frequency reducing（4）For 5Hz/38V, then pass through three-phase voltage increasing transformer（5）
It is exported after boosting（6）For 5Hz/1kV or 5Hz/0.6kV, finally by high-pressure vacuum contactor I（7）Access high-voltage electric disappears
Anti- pump（9）Carry out working voltage≤1kV, the low pressure low speed inspection of the rated speed of running speed≤1/10；
Frequency reducing module（3）To fix the frequency converter of output frequency and voltage characteristic, when low pressure low speed inspection is run, in opening for 0-t1
During dynamic, frequency reducing module（3）Starting output frequency be " 0 ", start output voltage is 19V；It is patrolled in t1-t2 low pressure low speed
During inspection, frequency no-load voltage ratio is 10:1, voltage change ratio is also 10:1；Frequency reducing module（3）Universal frequency converter can be used and be arranged
The mode of vector controlled replaces；Frequency reducing module（3）Configuration power be at least be adapted to high-voltage electric fire pump rated power 2%；
When being adapted to the high-voltage electric fire pump of rated voltage 10kV, three-phase main-frequency high voltage power supply（1）For 10kV, three-phase voltage increasing transformation
Device（5）Boosting no-load voltage ratio be 38：1000, output（6）For 5Hz/1kV；It is adapted to the high-voltage electric fire pump of rated voltage 6kV
When, three-phase main-frequency high voltage power supply（1）For 6kV, three-phase voltage increasing transformer（5）Boosting no-load voltage ratio be 38：600, output（6）For
5Hz/0.6kV；Three-phase voltage increasing transformer（5）Configuration power be at least be adapted to high-voltage electric fire pump rated power 2%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810557049.5A CN108757420B (en) | 2018-06-01 | 2018-06-01 | The device and implementation method of inspection are carried out to high-voltage electric fire pump using low tension |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810557049.5A CN108757420B (en) | 2018-06-01 | 2018-06-01 | The device and implementation method of inspection are carried out to high-voltage electric fire pump using low tension |
Publications (2)
| Publication Number | Publication Date |
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| CN108757420A true CN108757420A (en) | 2018-11-06 |
| CN108757420B CN108757420B (en) | 2019-10-29 |
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ID=64001776
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| US6534947B2 (en) * | 2001-01-12 | 2003-03-18 | Sta-Rite Industries, Inc. | Pump controller |
| CN101860232A (en) * | 2010-03-29 | 2010-10-13 | 北京利德华福电气技术有限公司 | Resonant type pre-charging circuit for high-voltage frequency converter and control method thereof |
| CN205494764U (en) * | 2015-12-30 | 2016-08-24 | 上海邦浦实业集团有限公司 | High pressure fire pump low frequency inspection device |
| CN105952662A (en) * | 2016-06-17 | 2016-09-21 | 广州三业科技有限公司 | Testing device and method for high-power electric pump set |
| CN106422146A (en) * | 2016-03-16 | 2017-02-22 | 徐飞 | Intelligent fire control and inspection combined cabinet |
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2018
- 2018-06-01 CN CN201810557049.5A patent/CN108757420B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5248811A (en) * | 1975-08-14 | 1977-04-19 | Matsushita Electric Ind Co Ltd | Controlling equipment for an electric compressor |
| US6534947B2 (en) * | 2001-01-12 | 2003-03-18 | Sta-Rite Industries, Inc. | Pump controller |
| CN101860232A (en) * | 2010-03-29 | 2010-10-13 | 北京利德华福电气技术有限公司 | Resonant type pre-charging circuit for high-voltage frequency converter and control method thereof |
| CN101860232B (en) * | 2010-03-29 | 2012-08-08 | 北京利德华福电气技术有限公司 | Resonant type pre-charging circuit for high-voltage frequency converter and control method thereof |
| CN205494764U (en) * | 2015-12-30 | 2016-08-24 | 上海邦浦实业集团有限公司 | High pressure fire pump low frequency inspection device |
| CN106422146A (en) * | 2016-03-16 | 2017-02-22 | 徐飞 | Intelligent fire control and inspection combined cabinet |
| CN105952662A (en) * | 2016-06-17 | 2016-09-21 | 广州三业科技有限公司 | Testing device and method for high-power electric pump set |
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| Publication number | Publication date |
|---|---|
| CN108757420B (en) | 2019-10-29 |
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Address after: 300381 Nankai District Jin Wei South Road, No. 110, Tianjin Applicant after: Tianjin Institute of Fire Protection, Ministry of Emergency Management Applicant after: Sanye Science and Technology Co., Ltd., Guangzhou Address before: 300381 Nankai District Jin Wei South Road, No. 110, Tianjin Applicant before: Tianjin Fire Fighting Inst., Ministry of Public Security Applicant before: Sanye Science and Technology Co., Ltd., Guangzhou |
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