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Direct effect of lightning test system

Aircraft, missiles, rockets, reentry vehicles and other aircraft will inevitably encounter lightning environment during takeoff and landing. Any interference of electronic systems or units will cause serious flight accidents. Due to the characteristics of high lightning voltage (over 100 million volts) and large current (over 200kA), it is impossible to conduct the simulation test directly in the laboratory. According to different characteristics of lightning and test purposes, the lightning effect test is divided into two parts: direct effect of lightning and indirect effect of lightning.

The direct lightning effect test is used to simulate the effect of combustion, corrosion, blasting crack, structural distortion and intensity reduction of the aircraft when it is subjected to direct lightning action. In general, the direct lightning effect is divided into high voltage (attachment point) test and physical damage test with large current (injection).

The high voltage attachment zone test system can simulate the probability of lightning attack in different areas of the aircraft surface when the equipment such as aircraft is hit by lightning. The large current physical damage test system is used to simulate the damage effect of high temperature and strong electric power on aircraft structure when the aircraft is hit by lightning.

Standard

MIL-STD-464C Electromagnetic Environmental Effects Requirements for Systems
SAE ARP5412 Aircraft Lightning Environment And Related Test Waveforms
RTCA/DO-160F/G Environmental Conditions and Test Procedures for Airborne Equipment Section 23
Lightning Direct Effects
HB6129-1987 Lightning protection requirements and test methods for civil aircraft
GJB 3567-1999 Test method for lightning protection identification of military aircraft

Vehicular high voltage test system
Physical damage test with large current

Vehicular high voltage test system

1.Summarize

This system consists of three parts, including high voltage generator, the waveform adjustment unit measurement and control system, through the adjustment of different wave unit the voltage waveform can be realized in A, B, C, D four waveform, the output waveform can meet the MIL - STD - 464 - C, GJB1389A and DO160 S23 standards such as high voltage test on direct lightning, can also be used to other similar lightning and overvoltage withstand test research

2.Characteristic

Indoor type adopts open main loop design and h-type tower mechanism, thus achieving overall subminiature (figure 1)
Designed with iron-clad oil-immersed body, with built-in multi-stage Max discharge circuit, vehicle-mounted mobile installation (outdoor) can be realized.
Automatic intelligent control system based on touch screen control, which can display the running state of equipment graphically, with simple and convenient operation
Equipping the uniform electric field electrode and the attachment point test electrode and the floor, etc
Marx generator is adopted to realize series discharge of parallel charging
Ball gap automatic tracking voltage within the full charging voltage range automatic adjustment of ball gap distance, adjustable precision of 0.1mm
Automatic safety protection procedures, audible and visual alarm

3.Definition of waveform parameters

According to standards such as mil-std-464c and SAE ARP5412, the test waveform mainly consists of four voltage waveforms A, B, C and D, as shown in the figure below.

Main technical parameters and features

LVG3000Technical parameters：
Output waveform	A waveform	B waveform	C waveform	D waveform
Wavefront time	1000（+500）kV/μs	1.2μs±20%	2μs±20%	50-250μs
Decay time	--	50±20%	--	Is greater than 2000
Peak efficiency	More than 80%	More than 90%	More than 80%	More than 60%
The voltage level	200kV
series	15
Voltage grade	3000kV
Discharge switch	Copper ball, triple play ignition
Switch forms	Linear drive 0-100mm adjustable, accuracy 0.1 mm
Form mode	A multistage Marx generator is used
Use the power supply	AC220V 100A
Charging voltage	20～200kV
Charge polarity	Positive/negative
Voltage measurement	If the damping voltage divider

1 - 副本.png

The plane's lightning high voltage is attached to the zoning test schematic

It can be used in vehicle high voltage lightning simulator

Indoor high-voltage test equipment (reference)

The test contents can be completed

Physical damage test with large current

Description of the apparatus

DLC200 series lightning direct effect test system (high current) is mainly used to achieve direct lightning test of large current physical damage test, this system USES modular structure design, the system consists of four components of a single generator, the joining together of 4 coupling decoupling unit, and 1 set of measurement and control system is composed of six shielding Fang Cang, by lifting transportation test to the test site, directly by the vehicle can be fixed in the laboratory experiment, waveform including ABCD four components, which can realize single component output, continuous output can also be combined together to implement multiple components. This technology has reached the international advanced level, leading domestic level.
满足标准

MIL-STD-464C
RTCA-DO 160G Section22
SAE ARP5412
SAE ARP5416
GJB 1389A
GJB 8848
GJB 3567
IEC 61643-11
GB/18802.1
characteristic

4 sets of generators can be combined to achieve continuous waveform output
The charging voltage can be arbitrarily set to achieve waveform output of A, Ah, B, C, C* and D6
Optional output 8/20, 10/350, etc
Rich protection functions, abnormal charging protection, connection detection, etc
Electromagnetic self-locking safety door switch protection, automatic safety grounding, protection of personal safety

Introduction to test project

This system can meet the standards of GJB1389A and GJB8848, and also meet the direct effect tests of aircraft such as DO160, ARP 5412 and GJB3567, that is, the reliability test of lightning environment for testing military equipment, and the physical damage test of large current for direct effect of aircraft lightning. The output waveform is shown below

Continuous waveform as defined by the aircraft lightning direct effect standard

Control system general parameters
viewing screen	A 15-inch color touch screen+Industrial PC
Working power range	AC 220 V 50 / 60 Hz 32A/The generator
controlCommunication methods	Industrial fiber networking controlCC-Link
Measurement communication mode	Industrial fiber Ethernet control
Discharge interval	20-999s，Can be set up
The output polarity	Positive and negative
Instrument working status indication	Touch screen, alarm light, alarm bell
Instrument ground connection mode	The use of copper platoon+Soft connect the ground wire
size	4m measurement and control vehicle (optional including vehicle)
Instrument weight	about3tons
Temperature range	-20～+50℃
Humidity range	≤90%
The altitude	No more than1500m

Internal structure layout of single generator

Each generator can run independently in structure design, the system can use mains power and generator power supply two kinds of schemes, and configurable generator, can be in outdoor environment test, no power supply generator body parts to the warehouse, high voltage dc power supply warehouse independently of the generator, which can effectively reduce the high voltage discharge damage to the power part of the electromagnetic interference (emi) produced

The high-voltage end of the output electrode is connected to the test point of the aircraft through insulating ball and arc wire, while the low-voltage end USES coaxial connection to connect with the backflow network outside the aircraft, which can reduce the inductance of the discharge loop. It is theoretically calculated that the maximum inductance of the discharge loop of 38m passenger plane is about 4uH

Measurement control system

Split type network control is adopted in the system, including four sets of single-wave fission control system, and A set of linkage waveform total control system, which can realize the four sets of generator (A, B, C, D waveform) separately control and integration of the centralized control, need only in the parameter Settings page set up several simple waveform parameters, click the run button on all four sets of generator for automatic operation can be realized, waveform display and calculate the parameters automatically, the output test report, test A key to achieve the whole test process is complete, A person can complete all test operation.

The optical fiber Ethernet is used for networking to ensure the relative electrical independence of each control system, as well as the high stability and reliability of the control system, greatly improving the anti-interference ability of the control system in the high electromagnetic environment.