Single-phase Relay Protection Tester

Answer:
The instrument's testing range fully covers all relay types mentioned without requiring additional specialized equipment. Specific compatibility details are as follows:
Conventional Relays: Fully supports current and voltage measurement relays, enabling precise measurement of pickup values, release values, and release coefficients. Time relays' pickup values, release values, and operating times can also be directly tested.
Intermediate relays with holding coils: Not only can it measure pickup values, dropout values, and operating times, but it can also specifically test the "minimum holding value"-by supplying constant voltage to the coil via the instrument's output, then adjusting the current to the minimum value required to maintain the relay's engagement after operation.
Differential relays: Taking the BCH-1 model as an example, it can perform required tests such as actuator parameter verification, voltage-current characteristic tests, and braking characteristic tests (requiring external voltage regulators and current boosters). It also supports core performance testing for other specialized differential relay specifications and accommodates calibration needs for various non-standard relays.

Answer:
The instrument is designed for "simple operation." Operators with basic electrical knowledge can quickly master it without professional training. Key advantages include:
Intuitive Panel: All functions are clearly zoned. Core knobs like Output Selection (T1), Constant Output Adjustment (T2), and Contact Status Selection (T3) feature clear labeling. Real-time status feedback is provided via Current/Voltage Display (X1), Millisecond Timer (X2), and Output Type Indicators (ACV/ACA, etc.), eliminating the need for specialized judgment.
Streamlined Process: All output operations follow a three-step procedure: "Select Range → Close Switch → Adjust Magnitude." When measuring critical parameters like relay trip values or timing, operators can determine status by connecting wires per the manual and monitoring the action indicator light. The correspondence between switch positions and contact states is simple and easy to remember (I/IV Range: "Close → Open"; II/III Range: "Open → Close").
Guidance Support: The manual provides specific wiring diagrams (e.g., for intermediate relays, differential relays) and operational steps for various relay types. Combined with intuitive indicator feedback, operators can complete testing by following the manual without additional technical expertise.

Answer:
The instrument incorporates targeted designs for safety protection and routine maintenance, minimizing field usage risks with extremely low maintenance costs:
Safety Protection:
Short-circuit protection: Explicitly prohibits short circuits between output power sources and between contact terminals and output power sources. Internal fuse holders are configured; in case of overload or short circuit, simply replace the fuse with the same model to restore functionality, preventing damage to core components.
Operational Safety Alerts: Power must be turned off when connecting or disconnecting wires. External power sources must not be connected to contacts during measurement of action times, eliminating safety risks through operational procedures.
Overload Warning: "Do not exceed rated current" is clearly marked during DC current adjustment to prevent instrument damage from misoperation.
Daily Maintenance:
No complex upkeep required. Simply ensure a 5–10 minute warm-up period before testing (to guarantee measurement accuracy).
If the instrument malfunctions, first inspect the fuse holder-replacement requires no specialized tools. For non-fuse issues, contact manufacturer support directly. Do not attempt disassembly or repairs yourself. Low maintenance costs and minimal difficulty.