Basic Info.
Model NO.
Arc acquisition unit
Type
Diffuse Reflection Type Photoelectric Sensor
Output Signal Type
Switching Type
Production Process
Normal Wirewound
Transport Package
Wooden Box
Specification
JC-1200 ARC Microcomputer Arc Protection Device
Product Description
Microcomputer Arc Protection DeviceIntelligence Arc Protection DeviceIntroduction of Arc and its Protection System
1.1 Overview
The damage to key equipments and personal damage are mainly caused by the arc in the short circuit faults of low and medium voltage busbars. However, most of low and medium voltage busbars in China are only provided with the simple arc-suppression device and the back-up protection system for transformer without the fast protection system for busbar. Due to less intelligence and slow motion of these protection systems, the fault clearing time is often extended so as to further expand the damage degree of equipment and even cause such serious accident as "fire and burn". When the impulse transformer runs once, the safety operation of the entire power grid will be affected. The arc protection system is a new arc protection system with unique innovative technology, wide availability and high reliability, which is independently developed by our Company after absorbing the characteristics of foreign arc protection system based on the domestic actual situation according to relevant specifications for industry testing and protection configuration. It is characterized by fast protection motion and high reliability because it adopts the double criterion principle of arc detection and current detection. 1.2 Causes of arc
The arc short circuit fault of the switchgear may be caused due to many reasons, which are generally divided into the following five categories:1) Insulation fault: it is mainly caused by insufficient creepage distance of insulation materials in the switchgear, and it does not meet the requirements of reinforced insulation. This fault occurs in the dirty environment and wet weather. In addition, due to material defects of insulation material, the switchgear with a long operating period is insulated and aged under the action of strong electromagnetic field, which may also cause insulation damage and malfunction. 2) Poor current-carrying loop: Due to insufficient joint section, loose fastening bolts and loose contact of handcart switchgear, the heating and sparking may occur when the high current flows so as to cause the phase to phase and phase to earth breakdown. 3) Entry of foreign bodies: for example, small animals (such as mouse) enter the switchgear or tools are left in the switchgear after the maintenance personnel finishes his work. 4) Misoperation: such as access to wrong interval, misoperation, no earthing in the workplace and no verification of live parts in the workplace.5) System reasons: for example, increasing system capacity, change in earthing mode, increasing application of cables, improper protection and self-control devices and resonant overvoltage of system. 1.3 Harms of arc
The power when the arc short circuit happens in the switchgear is 100MW, and the energy generated by the arc combustion increases exponentially with the burning time of the arc and the variation of short circuit current (as shown in the figure below). The high temperature and the high pressure generated by the combustion will gradually destroy the components, copper bars and the switchgear in line, and highly bright arc and toxic gas also have enormous harm to human body. In order to ensure that the equipment is not structurally damaged, the clearing time must be minimized. The estimate of the damage degree of the equipment depending various arcing time introduced by foreign materials is as shown below: | Arcing time | Damage degree of the equipment |
| 35 ms | No significant damage; this product generally can be put into use after testing the insulation resistance |
| 100ms | Minor damage; cleaning or some minor repairs are required before the switchgear is put into operation again. |
| 500ms | Since the equipment is damaged seriously and the personnel on site are also seriously injured, some equipments must be replaced before putting into operation.
|
1.4 Function and application area of the arc protection system
The arc protection system functions as follows: 1) Reduce or decrease the harms of arc to human body;2) Reduce or decrease the damage of arc short circuit fault to the equipment;3) Avoid the dynamic stability damage caused by the close range busbar fault of transformer and extend the service life of the transformer; 4) Shorten the arc fault clearing time to avoid significant losses caused by the DC system in the station; 5) Reduce the equipment shutdown time caused by the arc fault and restore the power more quickly; The arc protection system is mainly applied in the following situations: 1) Power substation2) Switchgear busbar room and feeder cabinet at the electric section of thermal power plant 3) Collector line switchgear of booster station of wind farm4) Box substation 5) Large-sized DC rectifier cabinet in aluminum and magnesium industry Chapter II Composition of Arc Protection System2.1 Domestic existing protection systems that are used in low and medium voltage systems and their limitations
1) Backup over current protection system for transformer: The typical motion time of protection is 1.2s~2s. 2) Backup over current protection system for transformer that adopts feeder instantaneous trip protection and locking: The typical motion time of protection is 300ms~500ms. 3) High impedance busbar differential protection: The typical motion time of protection is 30ms~50ms. All the protection systems above have a fatal weakness--slow motion. As shown in the Arc Harm Schematic Diagram, the motion time of protection devices can't exceed 20ms, otherwise, an irreparable device damage may be caused to prolong the fault repairing time. 2.2 Technical advantages of this system
1). Rapid and reliable motion: By adopting the reliable fast algorithm, the arc and current change signals can be judged and rapidly sent to the outlet in a short time. The time interval from discovering the fault to tripping at the outlet is shorter than 10ms so as to ensure that the arc in the switchgear can be removed within 75ms. 2. Complete digital design: The device adopts complete digital design which is characterized by flexible configuration and high motion precision and excludes the hidden trouble of errors caused by the knob or other mechanical design. 3. Simple and rational protection principleThe device adopts the double criterion of arc and current according to the characteristics when the arc is generated. The criteria are simple and can effectively ensure the accuracy of motion. 4. Strong electrical performance: The arc probe and connecting wire are made from heat-resistant and flame-retardant polymer materials which have superior electrical isolation effect. The device completely meets the EMC standard and ensures the overall stability of the arc protection system as well as motion reliability. 5. Comprehensive record of fault information After fault arc occurs and causes tripping, the main control unit or feeder protection unit can record the location information of the fault arc detected by the arc probe accurately and record the three-phase current value at the moment of motion in details. 6. Multiple auxiliary protection functions: The main control unit is not only provided with the arc protection system but also provided with auxiliary protection systems such as the breaker failure protection system. These protection systems are allocated rationally as an effective supplement to the arc protection system.2.3 Arc protection system
The arc protection system is mainly composed of the main control unit, the arc acquisition unit and the arc sensor. In order to meet the field application requirements, it is divided into bus arc protection system and feeder arc protection system. As shown in the following figure:| Tripping outlet |
| Arc protection main control unit |
| Ethernet (access to background) |
| Sensor |
| High-speed bus |
| Arc acquisition unit |
2.4 Technical characteristics
The system has the following technical characteristics:1) It satisfies all electromagnetic compatibility (EMC) standards;2) It conforms to the requirements of China's relay protection design standards;3) It adopts the double criterion of over-current and arc, with high reliability.4) It is connected and transmits with new optical fiber, and photoelectric conversion is completed in the device, with strong electromagnetic interference resistance;5) It adopts a new type of arc sensor to filter the interference light to filter the interference light, and avoid the visible light sensor mal-operation caused by the influence of ambient light.6) Outlet tripping time is less than 10ms, which is much faster than traditional bus protection. The total removal time of internal arc faults of switch cabinet can be controlled within 75ms.7) It is displayed with full Chinese characters, and operation habits are identical with traditional digital protection.8) The logic of trip exit is programmable.2.5. Instructions of device principle
1) Arc protection function.Arc protection is grouped on the basis of current units. Arc light probe can be tuned and correlated to any group of current signals.When the arc unit transmits the light signal from the arc sensor to the main control unit, the element acts with current, and the arc protection acts; the device can choose the arc signal action criterion as the action logic judgment.| From arc sensor |
| From CT |
| Or logic |
| And logic |
| Fast relay |
| Circuit breaker |
Chapter III Appearance and Structure of Arc Protection System
3.1 Size of main control unit structure
The main control unit adopts the fully enclosed 5U 1/3 standard case, and is mounted on the screen (cabinet). The plug-in is a rear-insert guide rail with tight screws up and down. The size of the mounting holes is as follows:| Reset |
| Function |
| Alarm |
| Tripping |
| Fault |
| Spare |
| OK |
| Cancel |
| Return |
3.2 Instruction of main control unit configuration
The main control device of arc protection is the core component of arc protection system. It is responsible for collecting, measuring, calculating and judging input data, realizing the protection logic of the system, communicating with the monitoring system in the station, self-checking and other auxiliary functions. The device case adopts the original "front-mounted and post-plugged" structure, that is, the LCD display panel is front-mounted, and other plug-ins are post-plugged, easy to maintain.| Hardware configuration | Functions | Notes |
| plug-in | With 12-route AC current input, it can directly collect three phase current information of 4 incoming lines. | AC module accesses 4 incoming current sampling |
| Arc light plug-in | The arc sensor interface can be directly connected to 1~16 arc detectors, and the corresponding probe address is 1~16. | |
| Communication port plug-in | 2-route 485 communication interfaces, 1-route CAN communication interface and 1 Ethernet interface. | The MODBUS standard issued by the Ministry of Communications is supported by the communication protocol. The communication mode is flexible and can be easily accessed to the integrated self-contained system in the station. |
| Outlet plug-in | 1) 3-route signal relay (alarm, accident and fault)
2)12-route conventional relay | |
| Display module | A 160*160 wide temperature liquid crystal display is used, and its backlight is designed to save electricity; the indicator light is made of LED with high brightness. | The display module can be used for human-machine interaction of equipment, and can complete keyboard processing and liquid crystal display. The display window adopts LCD, and the man-machine interface is clear and easy to understand. |
3.5 Arc sensor
The probe in the arc sensor is installed in each interval of the cabinet, which can realize the selective protection from simple to complex. As an optical sensor, the arc probe detects the sudden increase of light intensity when an arc fault occurs, converts the light signal into 4-20mA current signal by a special module and transfers the light signal to the arc unit or the main control unit of arc protection.3.6 arc sensor
In open space, such as bus room, the installation interval of arc sensor can reach 4 meters. The sensor can be installed on the partition board or frame of switch cabinet for the parts to be protected in the switch cabinet. Arc sensor can also be installed in the protection area with mounting plate.Chapter IV Arch Protection System Applications
4.1 Typical examples of single-busbar power supply
In this scheme, one main control unit and one or multiple (determined based on monitoring points) arch acquisition units are provided. In case there is any fault with the busbar, both circuit breakers QF1 and QF2 will trip; when the circuit breakers QF1 and QF2 become failed, the circuit breakers QF3 and QF4 will trip. 4.2 Typical examples of sectioned busbar power supply
In this scheme, two main units and one or multiple arch acquisition units are provided. In case there is any fault with the busbar, both circuit breakers QF1 and QF2 will trip and the busbar tie switch K1 will be locked (or trip). When the circuit breakers QF1 and QF2 become failed, QF3 and QF4 will trip.Chapter V Operating Instructions of Arch Protection Main Control Unit
5.1 Main control unit panel layout diagram and instructions
User-friendly panel design is adopted for this device.A LCD in pure Chinese is provided. Menu pages are operated level by level. Various data and events acquired by the device may be monitored and recorded according to the prompts on the menus. Parameter modification, protective debugging and other operations can be conducted on this device. Device operation indicators are provided. With these indicators, operators may visually understand the operating status of power supply, the device and communication, etc. Also, nine light-touch keys are provided on this device.5.2 Instructions to signal lamps
a) The "Operation" lamp is green when it is on. When the unit works normally, the lamp will flash once every second. Abnormal flashing indicates abnormal operation. b) The "Warning" lamp is red when it is on. When the unit works normally, the lamp will be off. The lamp will be on when any protection function alarms or there is any fault with self-check of the device. c) The "Act" lamp is red when it is on. It will be off when working normally. The lamp will be on when any protection function trips. 5.3 Instructions to keys
There are nine keys on the keyboard, namely "Reset", "Confirm", "Cancel", ""+, "-", "Up", "Down", " Left" and "Right". Their functions are described as follows:a) "Reset": For resetting protection warning signals;b) "Confirm": For confirming a specific operation or proceed to the following menu;c) "Cancel": For cancelling the operation done or return to the previous menu;d) "+", " -": For modification, including increase and decrease in value;e) Cursor movement buttons "+", "↓", "→" and "←": For cursor movement and value step adjustment.
Address:
311121, Hangzhou, Zhejiang, China
Business Type:
Manufacturer/Factory, Trading Company
Business Range:
Auto, Motorcycle Parts & Accessories, Electrical & Electronics, Industrial Equipment & Components, Instruments & Meters, Light Industry & Daily Use, Manufacturing & Processing Machinery, Metallurgy, Mineral & Energy, Service
Management System Certification:
ISO 9000, ISO 14001, OHSAS/ OHSMS 18001
Company Introduction:
Hangzhou Jingcheng electric Equipment Co., Ltd. (Brief name: Jingcheng Electric). Was founded in 1998, registered capital is 60 million yuan. We mainly produces 110kV and below series reactor, shunt reactor, magnetic control reactor, current limiting reactor, etc After years of development, we has gradually combined with other reactive power compensation related products: Capacitor, reactive power compensation controller, discharge coil, SVG, vacuum Contactors and other related reactive power compensation equipment for unified sales and production, in the reactor and reactive power compensation industry to create a domestic leading level, and gradually step out of the country to the world. Our company has specialized in the research of reactive power compensation device for more than 20 years, and has accumulated valuable experience in the industry. We are one of the first domestic manufacturers to develop and manufacture magnetic control reactor, and is also one of the advanced manufacturers of large capacity magnetic control shunt reactor in China.
Jingcheng electric has three production bases, which are located in Cangqian science and Technology Park in Hangzhou, Sandun Industrial Zone in Hangzhou and Deqing high tech Industrial Zone in Huzhou. Jingcheng electric covers an area of more than 120 mu, with a construction area of 400000 square meters, and has nearly 240 employees;
The advantages of our company are reliable product quality, preferential price and excellent service quality. We hope you and I can work together to deliver more reliable, high-quality and clean electric energy for the power transmission and distribution system. Each kW of electricity saved by us for the world will make a huge share for environmental protection. I hope you and I can create a better future together!
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