CN214011450U - Direct current load testing device for storage battery of nuclear power station - Google Patents
Direct current load testing device for storage battery of nuclear power station Download PDFInfo
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- CN214011450U CN214011450U CN202021900279.6U CN202021900279U CN214011450U CN 214011450 U CN214011450 U CN 214011450U CN 202021900279 U CN202021900279 U CN 202021900279U CN 214011450 U CN214011450 U CN 214011450U
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Abstract
The utility model discloses a nuclear power station battery test direct current load device, the device is including signal of telecommunication collection return circuit, PLC control panel, resistance array, CPU control panel, protection return circuit, remote communication circuit. The utility model discloses a modular design both has increased the capacity of a whole set of direct current load case and has satisfied 72 hours or 24 hours load curve requirement and harsh period heavy current rush, because the convenient transport of volume of reducing the load case again can carry out the independent assortment of load case according to on-the-spot actual demand. The problems of current and voltage acquisition in the test process of the 1E-level storage battery and integration of an online monitoring system and a load box control system are solved.
Description
Technical Field
The utility model belongs to the technical field of nuclear power plant's battery debugging, in particular to storage battery performance verification technique.
Background
For AP/CAP series nuclear power plants, under the design benchmark accident of the service power (two working conditions of AC loss and LOCA loss of the whole plant), the 1E-level storage battery pack can have the load capacity of 24h and 72h load curves according to different design requirements. In addition, the 1E-grade storage battery pack of the AP/CAP series nuclear power plant needs to supply power to a 1E-grade electric valve, and the starting current of the electric valve is large (more than 1200A), so that a test device is required to simulate the starting current of the electric valve and verify the loading capacity of the storage battery pack in the harsh period.
The debugging device and related tools of the 1E-grade storage battery used in the current AP1000 third-generation nuclear power field are supplied abroad. According to AP1000, by relying on debugging experience of projects, design characteristics of a 1E-level storage battery of a CAP1400 demonstration project under construction and a subsequent AP/CAP series nuclear power plant are fully evaluated, and domestic research on a large programmable modular direct-current load box and a related auxiliary monitoring and data acquisition system of the nuclear power plant is developed, so that field debugging cost is reduced, and the influence of factors such as long transportation period of a foreign debugging device, difficulty in later maintenance in the using process and the like on field debugging progress is effectively avoided.
The running time of 1E-grade storage batteries of most of domestic nuclear power plants is generally 2 hours, the storage batteries do not need to supply power for 1E-grade electric valves, only the C10 discharge rate is generally used for carrying out a conventional capacity test in the test of the storage batteries, and the in-service test of a load curve under the condition of 24 hours or 72 hours of accidents is not carried out. Therefore, the load box for testing bears the maximum current of about 400A, has no special requirements on programmable design, and cannot meet the requirements of large impact current and programmable performance required by CAP1400 engineering.
Under two working conditions of power failure and LOCA of a whole plant, in order to verify a load curve of a 1E-level storage battery of a nuclear power plant and the impact current capability in a severe period, a large programmable modular direct current load box is used for performing performance test on the 1E-level storage battery according to a relevant load curve, monitoring the test process and acquiring data.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming current direct current load box is bulky, capacious, programmable control is poor, and AP/CAP series nuclear power plant battery room is narrow and small leads to the not enough difficulty in experimental place space, the utility model discloses a battery debugging device provides a complete set of solution, can satisfy the requirement of the field debugging of AP/CAP series nuclear power plant battery.
A direct current load testing device for a storage battery of a nuclear power station comprises an electric signal acquisition circuit, a PLC control panel, a resistor array, a CPU control panel, a protection circuit and a remote communication circuit;
the electric signal acquisition loop adopts a high-precision Hall sensor to realize current acquisition, adopts a zero flux transformer and a high-precision voltage division circuit of a fluxgate technology to acquire the bus current voltage of the battery, and adopts a high-precision and low-temperature-drift double A/D sampling scheme to perform anti-interference processing on data;
the PLC control board controls the corresponding direct current contactor to be closed to realize the loading of the corresponding gear;
the resistor array is a consumption device of electric energy in the discharging process of the storage battery, and the resistor array adopts a positive temperature coefficient ceramic resistor as a power element, so that constant current discharging can be realized;
the CPU control board ensures the safe and reliable discharge of the storage batteries of all voltage classes by controlling the discharge path;
the protection loop can monitor the running state in real time, and when corresponding faults occur, corresponding protection actions are carried out according to a protection control strategy;
and the remote communication circuit adopts an RS485 communication circuit to communicate and interact with external equipment. The load box is connected with the confluence box through an RS485 line, the confluence box is connected with the upper computer through an RJ45, and the addition and subtraction of the current of the load box are controlled by programmable control software in the upper computer.
Preferably, the heat dissipation mode of the resistor array is forced air cooling, and a front air inlet and rear air outlet mode.
Preferably, air flow diversion grooves are formed among the cooling fan, the electric signal acquisition loop, the PLC control panel, the resistor array, the CPU control panel, the protection loop and the remote communication circuit.
Preferably, the radiating holes of the radiating fan adopt a net-shaped air outlet mode so as to reduce wind resistance.
Preferably, the air flow diversion groove is separated from the power consumption element by an epoxy plate.
The utility model discloses a modular design both has increased the capacity of a whole set of direct current load case and has satisfied 72 hours or 24 hours load curve requirement and harsh period heavy current rush, because the convenient transport of volume of reducing the load case again can carry out the independent assortment of load case according to on-the-spot actual demand. The problem of current, voltage acquisition and the integration of on-line monitoring system and load box control system in 1E level battery test process is solved.
The collection flow box is used as an intermediate conversion device for connecting the load box and the storage battery, plays the roles of collecting and displaying total voltage and current, displaying real-time parameters of each load box and controlling the load loading and unloading of the load box, is convenient for connecting the load box and the storage battery, is provided with abundant communication interfaces and cable sockets, and can meet the debugging requirements of AP/CAP series nuclear power plants.
The storage battery on-line monitoring system temporarily monitors the parameter change of the storage battery during the test under the condition that a field formal monitoring system is unavailable, thereby improving the control capability of the test and reducing the workload of testers. The capacity test of the storage battery in the single test stage is carried out, the test current is small, and a single load box can meet the simulation condition, so that the capacity test of the storage battery in multiple sequences can be carried out simultaneously, the labor cost and the time cost are saved, the debugging period is shortened, and the construction period of the whole project is shortened.
Drawings
FIG. 1 is a general block diagram of a DC load box;
FIG. 2 is a schematic view of the DC load box;
FIG. 3 is a schematic diagram of the DC load box control principle;
FIG. 4 is a voltage and current acquisition loop of a DC load box;
FIG. 5 is a schematic diagram of a DC loadbox resistor array;
fig. 6 is a parallel connection schematic diagram of 5 dc load boxes.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
In order to enable the 1E-grade storage battery of the AP/CAP series nuclear power plant to meet the requirements of a storage battery load curve and a 1 st minute impact load under two working conditions of power failure and LOCA of the whole plant and the characteristic that the installation position space of the 1E-grade storage battery is narrow, a programmable modular design idea is adopted to design and manufacture the direct-current load box.
1. Programmable modular dc loadbox appearance, as shown in fig. 1.
2. The header box appearance, as shown in fig. 2.
3. The programmable modular DC load box mainly comprises an electric signal acquisition loop, a PLC control panel, a resistor array, a CPU control panel, a protection loop, a remote communication circuit and a software display control and power supply part.
The PLC control panel is provided with 64 paths of I/O control switches, and the product has the characteristics of high stability, reliable control and the like. The CPU controls the PLC control panel to realize the action of weak current signals, and then controls the corresponding direct current contactor to be closed through the PLC control panel to realize the loading of corresponding gears.
The CPU control board ensures the safe and reliable discharge of the storage batteries of all voltage classes mainly by controlling the discharge path. The CPU adopts the industrial ARM processor control technology, the processing speed of the inner core reaches 72MHz, the sampling rate is 200ms, the power isolation technology is added in the internal circuit design, irregular waveforms in a power supply system are effectively filtered, interference of harmonic waves to output signals is prevented, and the accuracy of the output signals is ensured. The system adopts an ARM core 32-bit CPU to perform data processing operation, the main frequency speed is 168MHZ, and the minimum command execution time can reach 6 ns; the execution speed of each command is ensured. The DMA non-interference bus is arranged, so that the real-time performance of data acquisition and the real-time performance of reading and writing of the communication register are ensured. The flash memory with 256KB and the embedded SRAM with 64KB meet the memory requirement and the storage variable requirement of the operational data to the maximum extent. 144 rich hardware interface configuration, which satisfies the application of each control communication terminal.
The protection loop can monitor the current operation state in real time, and when corresponding faults occur, corresponding protection actions are carried out according to the protection control strategy. Is provided with: 1) controlling the over/under voltage protection of the loop; 2) over-temperature protection; 3) overvoltage protection; 4) performing undervoltage protection; 5) overcurrent, short circuit and overload protection; 5) emergency stop protection; 6) and (4) reverse connection prevention protection.
The remote communication circuit: and the RS485 communication circuit is adopted to be in communication interaction with external equipment, so that data transmission under various conditions can be met. The communication system adopts a Modbus-RTU protocol, one-to-many communication interaction data can be realized, the equipment can work as slave equipment, and the equipment address is determined by an address code coding switch on a CPU control panel. The 8-bit binary coded address code switch can program 128 unique non-repetitive device codes at most. The terminal matching resistor needs to perform actual impedance matching when the number of terminal devices is large.
The special air quantity drainage groove is adopted between the heat dissipation fan and the power consumption element, the effective heat dissipation efficiency of the heat dissipation fan can be improved by about 20%, and the heat dissipation holes adopt a net air outlet hole mode to reduce wind resistance. The drainage groove adopts the epoxy board to separate with the consumption component, can effectively keep apart the heat dissipation and the control part of consumption component.
4. A schematic diagram of the control principle of the programmable modular DC load box is shown in FIG. 3.
The load box is mainly used for testing the capacity of the storage battery, during the testing process, the storage battery is connected to the input end of the load box, the current voltage and current of the storage battery are collected in real time through an electric signal sampling loop inside the device and fed back to the CPU control board, relevant parameters and current needing to be loaded are set through software and are issued to the CPU control board, the CPU control board calculates the required resistance value through the current voltage of the storage battery collected in real time through the voltage and current sampling loop, then the PLC control board is controlled to attract the corresponding relay, the switching of the corresponding resistor in the resistor array is achieved, and the resistance value required by the CPU is achieved through series-parallel connection of the corresponding resistor in the resistor array. In the testing process, the above processes are repeated continuously, the resistance value of the resistor is adjusted according to the current storage battery voltage in real time, and the requirement of current loading is met. Meanwhile, the protection circuit can monitor the current operation condition in real time, and when corresponding faults occur, corresponding protection actions are carried out according to the protection control strategy. And the control power supply loop meets the control power supply requirement of the whole system.
5. And a voltage and current acquisition loop of the direct current load box is shown in figure 4.
This scheme adopts high accuracy hall sensor to realize that current collection, direct current voltage adopt the direct sampling mode, and current sampling precision and voltage sampling precision are superior to 0.1% FS. The voltage and current sampling method comprises two parts, namely, a zero flux transformer and a high-precision voltage division circuit of the fluxgate technology are adopted to collect the bus current and voltage of the battery, and a double A/D sampling scheme with high precision and low temperature drift is adopted to perform anti-interference processing on data. The bus current of the battery pack is collected by adopting the fluxgate technology, and the method has the advantages that the ultra-wide working temperature range is (-10 ℃ to +45 ℃), the precision in the whole temperature range is as high as 0.1% Ipn, and the temperature drift is as low as 100 ppm/DEG C (wherein the unit ppm/DEG C represents the degree of influence of temperature coefficient representation nominal value of resistance of the resistor on temperature change); the zero magnetic flux transformer has no electric energy loss by adopting a mode that a bus is directly penetrated, and the built-in shielding improves the capacity of resisting external interference, so that the accuracy of measured data is ensured to a great extent. The voltage and current strong electric signals are subjected to signal conditioning, isolated and directly transmitted to an ADC (analog to digital converter), and secondary signals are transmitted to a CPU (central processing unit) through digital to analog conversion.
6. A schematic diagram of a dc load box resistor array is shown in fig. 5.
The resistor array is a consumption device of electric energy in the discharging process of the storage battery, and the resistor array adopts a positive temperature coefficient ceramic resistor as a power element, so that constant current discharging can be realized. The heat dissipation mode is forced air cooling and front air inlet and rear air outlet.
The resistor array is composed of a direct current contactor and a resistor, the direct current contactor adopts components with large rated current-carrying capacity, the resistor adopts an iron-chromium-aluminum alloy (0Cr21Al6Nb) resistor belt, the temperature drift coefficient does not exceed +/-25 ppm +/-5 ppm, the service temperature is high, the high temperature can reach 1400 ℃ (1200 ℃ of the traditional nickel-chromium alloy material), the service life is long, the surface load is high, and the oxidation resistance is good. The requirements of long-time loading and high-power testing are met. Each set of gear design of the resistor array is divided into: 0.1A, 0.2A, 0.3A, 0.4A, 0.5A, 1A, 2A, 3A, 4A, 5A, 10A, 20A, 30A, 40A, 50A, 100A, total current total 301A.
7. The parallel machine connection schematic diagram of 5 direct current load boxes is shown in fig. 6.
5 direct current load boxes can be used in parallel, the maximum load current of each direct current load box is 300A @285VDC, and a plurality of direct current load boxes can be freely combined according to the field use requirement. The direct current load box meets the voltage range of DC 190V-285V, the current can be adjusted by 1-300A (@ DC200V), and the current below DC200V is gradually reduced according to the actual voltage. When 5 parallel machines are used, the maximum load current of the whole set of direct current load box is 1500A @285 VDC.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to encompass such modifications and variations. The above-described embodiments or implementations are merely illustrative of the present invention, which may be embodied in other specific forms or arrangements without departing from the spirit or essential characteristics thereof. The described embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. The scope of the invention should be determined by the appended claims, and any changes that are equivalent to the intent and scope of the claims are intended to be embraced therein.
Claims (5)
1. A direct current load device for testing a storage battery of a nuclear power station is characterized by comprising an electric signal acquisition circuit, a PLC control panel, a resistor array, a CPU control panel, a protection circuit and a remote communication circuit;
the electric signal acquisition loop adopts a high-precision Hall sensor to realize current acquisition, adopts a zero flux transformer and a high-precision voltage division circuit of a fluxgate technology to acquire the bus current voltage of the battery, and adopts a high-precision and low-temperature-drift double A/D sampling scheme to perform anti-interference processing on data;
the PLC control board controls the corresponding direct current contactor to be closed to realize the loading of the corresponding gear;
the resistor array is a consumption device of electric energy in the discharging process of the storage battery, and the resistor array adopts a positive temperature coefficient ceramic resistor as a power element, so that constant current discharging can be realized;
the CPU control board ensures the safe and reliable discharge of the storage batteries of all voltage classes by controlling the discharge path;
the protection loop can monitor the running state in real time, and when corresponding faults occur, corresponding protection actions are carried out according to a protection control strategy;
the remote communication circuit adopts RS485 communication circuit and external equipment communication interaction, and the load box is connected through the RS485 line with converging between the flow box, and the flow box is connected with the host computer through RJ45, controls the increase and decrease of load box current with the programmable control software in the host computer.
2. The direct-current load device for testing the storage battery of the nuclear power plant as recited in claim 1, wherein the heat dissipation mode of the resistor array is forced air cooling and front air inlet and rear air outlet.
3. The direct current load device for testing the storage battery of the nuclear power plant as claimed in claim 1, wherein an air flow diversion groove is adopted among the cooling fan, the electric signal acquisition circuit, the PLC control board, the resistor array, the CPU control board, the protection circuit and the remote communication circuit.
4. The direct current load device for testing the storage battery of the nuclear power plant as claimed in claim 3, wherein the heat dissipation holes of the heat dissipation fan adopt a mesh air outlet mode to reduce wind resistance.
5. The direct current load device for testing the storage battery of the nuclear power plant as claimed in claim 3, wherein the air flow diversion groove is separated from the power consumption element by an epoxy plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021900279.6U CN214011450U (en) | 2020-09-03 | 2020-09-03 | Direct current load testing device for storage battery of nuclear power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021900279.6U CN214011450U (en) | 2020-09-03 | 2020-09-03 | Direct current load testing device for storage battery of nuclear power station |
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| Publication Number | Publication Date |
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| CN214011450U true CN214011450U (en) | 2021-08-20 |
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| CN202021900279.6U Active CN214011450U (en) | 2020-09-03 | 2020-09-03 | Direct current load testing device for storage battery of nuclear power station |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220614 Address after: No. 29 Hong Cao Road, Xuhui District, Shanghai Patentee after: SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE Co.,Ltd. Address before: No. 29 Hong Cao Road, Xuhui District, Shanghai Patentee before: STATE NUCLEAR POWER ENGINEERING Co. Patentee before: SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| CP01 | Change in the name or title of a patent holder |
Address after: No. 29 Hong Cao Road, Xuhui District, Shanghai Patentee after: Shanghai Nuclear Engineering Research and Design Institute Co.,Ltd. Address before: No. 29 Hong Cao Road, Xuhui District, Shanghai Patentee before: SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |