The simulation device is mainly used for complete group tests of relay protection devices and to replace real high-voltage circuit breakers in projects such as standby power supply automatic switching device tests (according to needs, it can flexibly simulate the three phases of three groups of circuit breakers, with two independent three-phase closing and tripping operations). During complete group tests, it simulates the tripping and closing of high-voltage circuit breakers to avoid adverse effects caused by repeated opening and closing of high-voltage circuit breakers due to repeated complete group tests. This simulation device is a supporting product of the microcomputer relay protection test system and can also be used with relay protection calibration devices from other manufacturers. Especially in cases where the high-voltage circuit breakers of new plants or stations are not properly adjusted or DC power is not yet supplied, using this device for relay protection tests will not be affected by external factors, thereby shortening debugging time and improving test efficiency. Using this device in production manufacturers and scientific research departments is even more effective. Other similar applications can be handled according to specific conditions.
II. Principle of the Test Set
The simulation device uses a single-chip microcomputer as the control core to achieve functions such as setting the tripping and closing time of the simulated high-voltage circuit breaker, selecting three-phase/split-phase operation, and logical control of input signals, thereby simulating the tripping and closing actions of the high-voltage circuit breaker. It also provides a set of fully isolated adjustable voltage (25-250VDC) and adjustable current (0.5-10ADC) DC voltage output. The device is simple and reliable to operate.
III. Usage Method
(1) Connect the power supply and select as needed: closing time; tripping time; tripping and closing coil resistance (100 ohms or 200 ohms); whether the tripping and closing process is three-phase or single-phase operation.
(2) The panel is equipped with manual tripping and closing buttons. When operated, all three phases trip and close simultaneously.
When the simulation device is in the closing state, the closing indicator light (red) is on. At this time, the normally open contact of the simulation device is closed, and the normally closed contact is open.
When the simulation device is in the tripping state, the tripping indicator light (green) is on. At this time, the normally closed contact of the simulation device is closed, and the normally open contact is open.
For example: during a complete group test, the A, B, C detection contacts of the system host are respectively connected to the A, B, C three-phase tripping normally closed contacts (green points) of the simulation device; the R detection contact is connected to the A, B, C three-phase closing normally open contacts (red lights) of the simulation device. If a three-phase consistent reclosing test is performed, the R detection contact can be connected to any one phase of the A, B, C three-phase closing normally open contacts of the simulation device; if a three-phase inconsistent reclosing test is performed, the R detection contact must be connected to the phase that operates among the A, B, C three-phase closing normally open contacts of the simulation device. In the software settings, the "circuit breaker opening delay" and "circuit breaker opening and closing delay" are set to "0" milliseconds.
(3) The tripping and closing pulse power supply input from external sources can be DC 110V or DC 220V. When using this simulation device for complete group tests of protection, disconnect the three-phase tripping terminals and three-phase closing terminals in the operation circuit on the protection panel from the external circuit, then connect them to the tripping and closing input terminals of the simulation device, and connect the negative terminal of the power supply to the DC common terminal (one) of the simulation device.
(4) When the operation selection is "three-phase", tripping and closing pulses or manual tripping and closing will cause all three phases of the simulated circuit breaker to operate. In "split-phase" mode, tripping and closing pulses only cause the corresponding phase to operate, while the other two phases remain unchanged.
(5) If the newly installed protection device does not yet have a DC operating power supply, the isolated DC power supply provided by this machine can be used. By adjusting the knob, different voltage values (25-250VDC) can be output to test the protection action characteristics.
IV. Technical Specifications
(1) Power supply: 220V±15%AC
(2) Tripping and closing operation power supply voltage: DC 48-220V
(3) Tripping and closing coil resistance selection: 100Ω, 200Ω
(4) Closing time selection: 50ms, 100ms, 150ms, 200ms, 300ms, 400ms, 500ms
(5) Tripping time selection: 20ms, 40ms, 60ms, 80ms, 100ms
(6) Normally closed/normally open contact capacity of the simulated circuit breaker: AC 250V/8A, DC 250V/2A
(7) Isolated DC voltage output: output voltage adjustable from 25-250V, output load current adjustable from 0.5-10A
(8) Overall dimensions: 4U standard chassis, 140×440×355mm (H×W×D)
(9) Overall weight: 9kg
