What are the main tests when using the relay protection tester?

Instructions

1. Correct steps

It is divided into two circuits, the main circuit and the auxiliary circuit. The main circuit is adjusted by a large knob, and the auxiliary circuit is adjusted by a small knob. The main circuit controls various output quantities through the "output selection" button switch on the panel, and each time an output is switched, the digital voltage/current meter on the instrument can automatically monitor its output value. The auxiliary circuit directly adjusts the output through the output switch control, and the measurement can be measured with an external multimeter.

2. Circuit Principle

1. The input AC220V power enters the input end of the double-brush voltage regulator T1 through the output control relay K1 through the insurance, and the power adjusted by the large knob of T1 enters the isolation transformer T2 (part-time current booster). The current booster has three tap outputs, one tap is AC0-250V output, and the rated current is 3A; the output voltage of this tap can output 0-350V DC voltage after rectification and filtering; the second tap is 15V (10A), one tap outputs 0-10A AC current through the sensor through the relay control, one tap outputs 0-500mA AC current through the resistor, and one tap outputs 0-10A or 0-500mA DC current through the relay conversion; the second tap is the 10V (100A) high current end, which directly outputs 100A current through the primary side of the sensor. The circuit has a strong load capacity, but the output is slightly overloaded and cannot be in a high current state for a long time. The auxiliary circuit of the thermal relay tester is the same as the main circuit. The AC220V power supply enters the voltage of the double carbon brush voltage regulator T1 through the insurance. The voltage can be adjusted by the small knob. The output can be directly adjusted to 0-20V or 0-250V AC voltage or 0-350V DC voltage through the isolation transformer T4. The rated current of this circuit is 1A. Press the "output control" switch of the auxiliary circuit and adjust the small knob to output.

2. Measurement circuit

The output of the main circuit adjusted by the large knob is AC "0-250V", "0-500mA", "0-10A", "0-100A", and DC "0-350V", "0-500mA", "0-10A" are switched through the relay on the circuit board inside the device. Each time a gear is switched, the corresponding output can be monitored. Among them, the "0-500mA" gear is included in the "0-10A" gear. When in use, "0-500mA" monitoring is performed when "0-10A" is pressed twice.

3. Time measurement

The device has a built-in 6-digit stopwatch, which can be started internally or externally. When started internally, press the "output control" switch to start the stopwatch, and stop the stopwatch by short-circuiting the stopwatch terminal on the device panel. The stopwatch has a separate power switch, which can be turned off when not in use.

4. Sound and light prompts

The circuit equipment has a built-in sound and light prompt circuit. When the contact of the tested circuit breaker is actuated, the contact can be connected to the sound and light prompt jack of the test box, and an alarm sound or light will be emitted in the test box to indicate the actuation of the circuit breaker contact.

3. Specifications and Features

1. The industry's first true color touch screen + key control, making operation easier

This machine uses an 8-inch true color touch screen, with a self-designed keyboard, making the operation faster and more handy. At the same time, when the program starts the test, the touch screen is automatically turned off to prevent any misoperation.

2. The industry's first built-in single-circuit embedded analog circuit breaker

The simulated circuit breaker is mainly used to replace the real high-voltage circuit breaker in the whole group test of relay protection devices and in the test of standby power supply automatic switching device. The built-in simulation device of this machine is a supporting product of the microcomputer relay protection test system. Especially when the high-voltage circuit breaker of the newly built power plant or substation is not adjusted or the DC power supply is not switched, the relay protection test using the built-in simulated circuit breaker will not be affected by external factors, thereby shortening the debugging time and improving the test efficiency.

3. Embedded host, equipped with ultra-large-scale programmable logic device (CPLD)

The host adopts a high-speed, high-performance embedded microcomputer system equipped with CPLD, which has fast response speed and wide transmission bandwidth. It can generate a high-density fitted sine wave with 500 points per cycle for the fundamental wave, and the output waveform is smooth without harmonic components. Due to the large number of output points and the precise filtering circuit, the waveform distortion is extremely small. When the harmonic output is performed, even for the 9th harmonic and 450Hz, a high density of 55 points per cycle can be achieved.

4. Single machine 12-channel D/A simultaneous output

The 16-bit high-precision DAC chip is used to ensure high accuracy and good linearity of the fitted waveform. It can output 12 analog signals at the same time to meet all-round tests such as transformer protection and automatic switching of backup power supplies.

5. High-precision linear power amplifier, output 6-phase voltage and 6-phase current at the same time

The carefully designed voltage and current amplifiers realize AC/DC sharing, and the output stage adopts a unique high-precision ultra-linear amplification technology. It has high precision and good reliability, and outputs 6-phase AC voltage and 6-phase AC current at the same time. Each phase AC voltage output is up to 130V, 70VA, and the AC current output is up to 180A. The DC voltage output can reach 300V, 130VA.

6. Complete interfaces, integrated host single chassis structure

The system operation interface and test results are displayed in full Chinese. All operation processes are set on the display screen, and the display is intuitive and clear. The device can be operated with its own touch screen and keyboard, and also provides an external keyboard/mouse port. It also provides 2 USB ports and 2 RS232 ports for communication with external computers and other devices. It only needs an AC 220V power supply and can work after turning it on. It is easy to carry and very suitable for mobile tests and field work.

7. Auxiliary DC source (optional)

The machine can be equipped with two independent DC power supplies, one set is 110VDC/1.0A, and the other set is 220VDC/0.6A. They will output power automatically at the same time when the machine is turned on, and can be used as a protective power supply without the need for software settings and adjustments.

8. Intelligent self-protection

The latest heat dissipation structure is adopted to ensure the best ventilation. It can also judge overcurrent, overvoltage, overload, short circuit, overtemperature, data anomaly and other phenomena that endanger the safety of the device itself, so that even if there is an operation error, the device will not be damaged. In addition, when a dangerous signal such as external voltage enters the tester through the terminal, the device alarm indicator turns red and automatically cuts off the power amplifier.

9. Rich contact points and strong test applicability

The device has eight switch inputs (ABCR abcr) and four switch outputs. The input contacts are compatible with empty contacts and 0-250V potential contacts, and can be intelligently identified.

10. Flexible placement and powerful software functions

The device can be placed vertically or horizontally, can be operated offline, or connected to an external PC. The test results can be automatically organized and recorded into a test report for reference. It can also be directly saved using a USB flash drive and conveniently transferred to an external PC for editing, printing, and other processing. The software upgrade is simple and fast, and can be directly upgraded through a USB flash drive or downloaded from an external PC without changing any hardware. The software-assisted calculation function is powerful and can automatically calculate positive, negative, and zero-sequence voltage and current, primary and secondary active, reactive, and power factors. An optional built-in GPS module is available, and synchronous joint adjustment can be performed by simply connecting an external antenna.

11. It can be used for automatic switching test of 6-phase voltage and 6-phase current output. It can carry out automatic switching double-group test of standby power supply and three-phase differential test of transformer. The wiring is very simple.

12. Specially designed differential test menu for electric railways. According to the working principle of transformer differential protection in railway traction transmission and transformation system, the proportional braking characteristics of electric railway transformers are automatically tested.

experiment

The relay protection tester is mainly used for preventive tests on relays, microcomputer protection, and other protection devices. The recommended test modules for relay tests are: DC test, AC/DC test, AC test, differential test, differential harmonic test, power impedance, power direction and impedance test, and synchronization test; the microcomputer protection test mainly performs line protection, generator-transformer group protection related tests, as well as automatic quasi-synchronous devices, standby automatic switching devices, and bus differential protection related tests!