I. Main Features of DRJB861 Relay Protection Tester:
1. The main and auxiliary AC/DC outputs do not interfere with each other.
2. Comprehensive monitoring of DCV, DCA, ACV, ACA.
3. Equipped with contact closure light and buzzer indication.
4. All digital display, convenient for night use.
5. Aluminum alloy shell, compact and portable.
II. Working Principle of DRJB861 Relay Protection Tester:
1. The working principle and performance are described as follows.
2. Principle description: The whole machine consists of a main circuit and an auxiliary circuit, with different measurement and control functions.
(1) Main circuit:
LDJB-702 Three-Phase Relay Protection Tester The input AC220V is adjusted by the main voltage regulator, then through the isolation transformer (also serving as a current booster), the high voltage output is AC0~250V, and after rectification and filtering, DC0~300V is output. For low voltage and high current, one output is 100A, and the other is 20A. The 20A output has strong load capacity and can run at full load for a long time.
AC/DC current measurement uses a new type of current sensor with accuracy better than 0.5%. The current sensor samples, and after differential amplification, it is displayed on the digital meter. The decimal point automatically switches for 100A and 20A.
For voltage measurement, there is a digital meter at the top of the instrument. The output voltage to be monitored can be selected via the monitor selector switch, basically meeting testing requirements.
(2) Auxiliary circuit
AC220V is adjusted by the auxiliary voltage regulator to output AC0~250V, and after rectification and filtering, DC0~300V is output (can be monitored via the monitor selector switch). It cooperates with the main circuit to complete various relay calibrations requiring two circuits (such as reclosing relays). There is also a DC5V output for the internal electric stopwatch and digital meter.
III. Main Technical Specifications of DRJB861 Relay Protection Tester:
1. AC current output accuracy: 0.5 class
Phase current output (RMS): 0~40A
Three-phase parallel current output (RMS): 0~120A
Phase current long-term allowable working value (RMS): 10A
Maximum output power of phase current: 420VA
Maximum output power when three-phase parallel current is at maximum: 900VA
Allowable working time when three-phase parallel current is at maximum: 10s
Frequency range (fundamental): 20~1000Hz
Harmonic order: 1~20 times
2. DC current output accuracy: 0.5 class
Current output: 0~±10A / per phase, 0~±30A / three-phase parallel
Maximum output load voltage: 20V
3. AC voltage output accuracy: 0.5 class
Phase voltage output (RMS): 0~120V
Line voltage output (RMS): 0~240V
Maximum output power of phase voltage: 80VA
Maximum output power of line voltage: 160VA
Frequency range (fundamental): 20~1000Hz
Harmonic order: 1~20 times
4. DC voltage output accuracy: 0.5 class
Voltage output: 0~±160V
Maximum output power: 80VA
5. AC/DC auxiliary voltage output: 0~250V AC, 0~300V DC
6. Time measurement: 0.001~999.999s, accuracy: ±0.001s
7. Working power supply: AC220V±10%, 50Hz
8. Dimensions: 420mm×220mm×320mm
9. Weight: 20kg
IV. Working Environment:
1. Ambient temperature: -10°C~+50°C
2. Relative humidity: ≤85%
3. No conductive dust, corrosive gases, or explosive media around.
4. No strong electromagnetic interference.
V. Product Features:
1. The instrument adopts a new generation of high-performance microprocessors and high-precision A/D converters, with high measurement accuracy and stable performance.
2. The instrument has a large-screen LCD display, Chinese menu operation, and is simple and convenient to use.
3. The instrument has a built-in high-precision real-time clock, which can automatically record the test time.
4. The instrument has a built-in thermal printer, which can print test reports on site.
5. The instrument has a USB interface, which can easily transfer test data to a computer for analysis and management.
6. The instrument has a compact structure, small size, light weight, and is easy to carry.
VI. Scope of Application:
DRJB861 relay protection tester is widely used in electric power systems, railway systems, petrochemical industry, metallurgy, mining, and other fields. It is suitable for testing various types of relay protection devices, such as overcurrent relays, voltage relays, differential relays, distance relays, etc. It can also be used for testing current transformers, voltage transformers, and other electrical equipment.
VII. Precautions:
1. Before use, carefully read the user manual and understand the performance and operation methods of the instrument.
2. The instrument must be reliably grounded before use.
3. When connecting the test line, ensure that the connection is correct and firm to avoid poor contact.
4. During the test, it is strictly forbidden to touch the test terminal to avoid electric shock.
5. After the test, turn off the power switch and disconnect the test line.
6. The instrument should be stored in a dry, ventilated, and non-corrosive gas environment.
7. If the instrument malfunctions, please contact the manufacturer for repair and do not disassemble it without authorization.
VIII. Ordering Information:
When ordering, please specify the model, quantity, and any special requirements. We will provide the best products and services according to your needs.
Contact us:
Yangzhou Darui Electric Co., Ltd.
Address: No. 88, Development Road, Yangzhou City, Jiangsu Province, China
Tel: +86-514-87912345
Fax: +86-514-87912346
Website: www.yzdr.com
Email: yzdr@yzdr.com
