Sheng Xu provides: basic principle of microcomputer relay protection calibrator
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1. What is the function of relay protection and safety automatic devices?
When an element in the power system or the power system itself fails or threatens its safe operation, an alarm signal is sent to the monitoring personnel in time, or a trip signal is directly sent to the controlled circuit breaker to terminate the development of these events. Automation measures and equipment.
2. What is the task of relay protection in the power system?
(1) When a protected power system component fails, the relay protection device of the component should promptly and accurately issue a trip command to the circuit breaker nearest to the faulty component, so that the faulty component is disconnected from the power system to maximize Minimize the damage to the power components themselves, reduce the impact on the safe power supply of the power system, and meet certain specific requirements of the power system (such as maintaining the transient stability of the power system);
(2) React to the abnormal working condition of the electrical equipment, and send a signal according to the abnormal situation, so that the operating personnel can perform timely processing, or the device can automatically adjust. Relay protection devices that react abnormally are allowed to have a certain time delay action.
3, commonly used relay protection type:
(1) Current protection: The protection achieved when the current increases in response to a fault is generally accomplished by two-three-stage protection.
A, the current is cut off quickly: The line of the reaction is serious, remove quickly;
B. Time-limited quick disconnect: generally used in 35KV line, avoid the low-voltage side of the transformer with the fault, cut off the fault in a shorter time;
C, timing over-current: the fault at the end of the reaction line or fault through a large resistance short circuit, the provisions of the provisions of 10
(5) High-frequency protection: Inject high-frequency signals from a high-frequency signal generator (transmitter) into transmission lines, and compare the received high-frequency signals (receivers) to determine whether it is an internal fault. , If the fault inside the two sides of the switch will trip at the same time.
The injection of high-frequency signals into transmission lines will not affect the power transmission of the transmission lines and will only flow through the transmission lines and will not flow into the system. High-frequency channels need to be tested daily.
There are two ways to implement high-frequency protection:
A. Lock-up type: High-frequency blocking signals are continuously issued at both ends of the transmission line. When a fault in the area is detected, the transmission stops and the receivers on both sides cannot receive the high-frequency blocking signal and trip at the same time.
B. Permissive: The transmitter on both sides does not send a letter normally. When a fault in the area is detected, an allow signal is issued. At the same time, the export is tripped after receiving the permission signal from the other party.
4. What are the basic requirements for relay protection in the power system?
The basic performance requirements for power system relay protection are: reliability, rapidity, selectivity, and sensitivity.
Microcomputer relay protection calibrator technical parameters:
1, the current source BY660 AC amplitude: 0 ~ 40A / phase 0 ~ 120A / three-phase parallel DC amplitude: 0 ~ 30A / phase 0 ~ 90A / three-phase parallel power: 400VA / phase amplitude accuracy: ≤ 0.2% Response time <160μS, resolution: AC 1mA, DC 2mA
2. AC source voltage amplitude: 0～125V/phase DC amplitude: 0～220V/phase auxiliary power supply: VZ: 3VO0～125VAC or 0～220VDC power ≥130W
Maximum power: 50VA/phase accuracy: ≤0.2% response time <120μS
Resolution: AC 2.5mV DC: 3.5mV
3, Frequency: Range 0 ~ 1000Hz Resolution: 0.001Hz (frequency) 0.1Hz (1KHz)
4ã€Phase: Range 0～360° Resolution: 0.1° Accuracy: 0.1° 5 Time Range: 0～9999.999S±1.0ms
6, switch input: 7 pairs of empty contacts / 10 ~ 250VDC with potential contact 7, switch output: 3 pairs of empty contacts (capacity: 250VAC, 2A)
8, the supply voltage: 120V ~ 250VAC50/60Hz
9, chassis size: 450mm × 150mm × 370mm
10, weight: 11Kg
Microcomputer relay protection calibrator main features:
1, intelligent host, the host uses DSP chip control, 16-bit DAC output, the fundamental wave can produce 2,000 points per week, high-density sine wave, the highest level for the domestic tester. Greatly improved the waveform quality and improved the accuracy of the tester.
2. The stand-alone operation is independent, the device is operated by rotating the mouse through the large-screen LCD display, a full set of Chinese display, and various kinds of relays, protection and safety automatic devices on the site can be tested, and various large-scale complex transient and permanent can be simulated. Sex and conversion failures are tested in the entire group.
3, connected to the computer running, through a full set of Chinese operating software on the WindowsXP platform, can perform a variety of large-scale and more highly automated calibration work, can easily test and scan a variety of protection settings, real-time storage of test data, Display vector diagrams, draw fault waveforms, print reports, and more.
4. The liquid crystal display adopts a 320×240 dot matrix graphic module. The operation interface is displayed in Chinese and the display is intuitive and clear.
5, "fool" operation, the use of advanced "photoelectric rotary mouse" controller, eliminating the need for complex keyboard operation, no computer knowledge can be operated, easy to learn.
6, the use of switching power supply and switching amplifier technology, small size, light weight, weighing only 11 kg.
7, modular design, all plug-ins completely independent, only need to change plug-ins to achieve hardware maintenance and upgrades.
8, arbitrary configuration, such as configured into 6-phase current, 5-phase voltage + 2-phase current.
9. The user can calibrate the accuracy of the tester through the software.
10, comes with GPS global satellite receiving system to achieve the test at both ends of the transfer.
11. Playback of Comtrade format fault recording data can be performed.
12. A power factor correction circuit is designed according to international standards so that the efficiency of the device can reach 95% or more.
13, when the supply voltage drops to 120V, it still ensures the normal operation of the device.
14. The amplifier uses hardware protection to ensure the reliability of the device.
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The thickness of the film is about 0.016mm.The period of production is within 30 days after the confirmation of the order.