Relay Protection Test Box

KEJBY-C Type Relay Protection Test Kit

Product Name: Relay Protection Test Kit
Product Model: KEJBY-C
Alternative Names: 1. Single-Phase Relay Protection Test Kit
2. Relay Protection Tester
3. Single-Phase Relay Protection Calibrator
4. Relay Protection Test Device

I. Purpose and Features
      The KEJBY-C Type Relay Protection Test Kit is another new type of relay protection test equipment developed by our company in recent years. While the main body remains unchanged, it features a stainless steel or aluminum-plastic specialized shockproof casing, which is both aesthetically pleasing and sturdy, with excellent shock absorption performance.
       This tester uses a dual-carbon brush voltage regulator (i.e., a dual-sided voltage regulator). The large knob adjusts AC/DC voltage and current for heavier loads, while the small knob adjusts AC/DC voltage and current for lighter loads, allowing simultaneous output from both channels. Equipped with a 0.5-grade digital meter, high-precision sensors, and accurate measurement capabilities, it also includes a six-digit digital stopwatch for time measurement, making it an excellent tool for relay protection personnel working in the field.

II. Main Technical Specifications:
      1. Input Power: AC220V±10％   50Hz
      2. Rated Capacity: 1.0KVA (can be increased or decreased as required)
      3. Output:
          Main Circuit:    AC  0～250V（3A） (adjusted by large knob) 0～500mA（20V）

0～10A（20V）  0～100A（15V）  DC  0～350V（3A） 0～10A （20V）

0～500mA（15V）

           Auxiliary Circuit:(adjusted by small knob) AC  0～250V（1A） AC   0～20V（1A）

DC   0～350V （1A） 
      4. Measurement Range:Voltage Measurement Range:    0～250.0V (direct measurement)
                            AC Current Measurement Range: 0～500mA (direct measurement) 0～10.00A (shunt input)
                            Time Measurement Range:    0～999.999S (resolution 1ms)
      5. Accuracy: Measurement accuracy 0.5 grade
      6. Weight: 18.0Kg
      7. Dimensions: 470×320×230mm
      8. Operating Environment Temperature: -20℃～45℃

III. Working Principle
       3.1 Principle Description
       This tester is divided into two circuits: the main circuit and the auxiliary circuit. The main circuit is adjusted by the large knob, and the auxiliary circuit is adjusted by the small knob. The main circuit's various outputs are controlled by the "Output Selection" button switch on the panel. Each time the output is switched, the digital voltage/current meter on the instrument automatically monitors the output value. The auxiliary circuit is directly adjusted via the output switch, and measurements can be taken using an external multimeter.
       The common terminal for AC is “＊”, and the common terminal for DC is “⊥”.
      3.1.1 Main Circuit Principle
       The input AC220V power passes through a fuse and enters the dual-carbon brush voltage regulator T1 via the output control relay K1. The electrical quantity adjusted by the large knob of T1 enters the isolation transformer T2 (which also functions as a current booster). The current booster has three tap outputs: one tap outputs AC 0～250V with a rated current of 3A; this tap's output voltage can be rectified and filtered to output DC 0～350V. The second tap outputs 20V (10A); one path from this tap passes through a sensor and is controlled by a relay to output 0-10A AC current, another path outputs 0～500mA AC current through a resistor, and another path can output 0～10A or 0～500mA DC current via relay switching. The third tap is a 15V (100A) high-current terminal; this tap passes through the sensor once and directly outputs 100A current. This circuit has strong load capacity but should not be operated at high current for extended periods as it may overload slightly.
       3.1.2 Auxiliary Circuit
      Similar to the main circuit, the AC220V power passes through a fuse and enters the dual-carbon brush voltage regulator T1. The voltage adjusted by the small knob is directly output as AC 0～20V or 0～250V or DC 0～350V through the isolation transformer T4. This circuit has a rated current of 1A. Press the auxiliary circuit "Output Control" switch and adjust the small knob to output.
       3.1.3 Measurement Circuit
       The main circuit outputs adjusted by the large knob include AC "0～250V", "0～500mA", "0～10A", "0～100A", and DC "0～350V", "0～500mA", "0～10A". These are switched via relays on the internal circuit board. Each time a range is selected, the corresponding output can be monitored. The "0～500mA" range is included in the "0～10A" range; when using the "0～10A" range, pressing it twice will monitor "0～500mA".
       3.1.4 Time Measurement
      The device has a built-in six-digit digital stopwatch. The stopwatch can be started internally or externally. For internal start, press the "Output Control" switch to start the stopwatch. Shorting the stop terminals on the panel will stop the stopwatch. The stopwatch has a separate power switch and can be turned off when not in use.
       3.1.5 Audible and Visual Alerts
       The circuit device has built-in audible and visual alert circuits. When the contacts of the tested relay operate, the contacts can be connected to the test kit's alert jack, and the test kit will emit an alarm sound or light up to indicate the relay contact operation status.

Note: The product is continuously updated and improved during production. The product appearance images are for reference only (subject to the actual product). Changes may be made without prior notice.