Portable transformer substation terminal box heater fault diagnosis device

The utility model discloses a portable transformer station terminal box heater fault diagnosis device. The circuit comprises a battery (1), an operational amplifier (2), an active buzzer (3), a firstresistor R1 (4), a second resistor R2 (5), a third resistor R3 (6), a test terminal a (7), a test terminal b (8) and a heating plate (9). After the second resistor R2 (5) and the third resistor R3 (6)are connected in series, the two ends of the second resistor R2 (5) and the third resistor R3 (6) are sequentially connected to the positive and negative electrodes of the battery (1), and the jointof the second resistor R2 (5) and the third resistor R3 (6) is connected to the negative input end of the operational amplifier (2); one end of the first resistor R1 (4) is connected with the anode ofthe battery (1), and the other end is connected with the test terminal a (7) and connected to the positive input end of the operational amplifier (2); two ends of the active buzzer (3) are respectively connected with the output