A411, A421, A431 corresponds to the current transformer 1, 2, 3 times the coil, the three coils in the figure for the microcomputer relay protection, measurement, standby. TAa, TAb, TAc, respectively, for the A, B, C-phase current transformer, YHa, YHb, YHc is the A, B, C-phase voltage transformer.
According to the national electrical equipment line naming standards:
1, high-voltage electrical equipment, the first power supply cabinet from the power supply, in turn, the ammeter, voltmeter, meter to start with a 4-word, belonging to the measurement equipment.
2, high-voltage electrical equipment to control the power supply begins with the word 5, belonging to the control circuit.
3, high-voltage electrical equipment, electrical cabinet and electrical cabinet signal power supply connection starts with 6 words, belongs to the control signal return circuit.
4, high-voltage electrical equipment remote control power supply begins with 7 words, belonging to the remote control circuit.
5, high-voltage electrical equipment actuator control circuit begins with 8 words, belonging to the actuator control circuit.
6, high-voltage electrical equipment actuator remote finger circuit begins with 9 words, belongs to the actuator remote circuit.
Extended information
Because of the electromagnetic current transformer saturation, non-linear and narrow bandwidth and other problems, the electronic current transformer is gradually emerging. Electronic current transformers generally have the advantages of anti-magnetic saturation, low power consumption, wide bandwidth and so on.
The representative electronic transformers in China are AnyWay inverter voltage sensors, AnyWay inverter current sensors and AnyWay inverter power sensors, of which AnyWay inverter power sensors belong to the voltage and current combined transformers.
The main features of the transformer are as follows:
1. Adopting front-end digital technology, fiber optic transmission, and good electromagnetic compatibility.
2, amplitude-frequency characteristics and phase-frequency characteristics are good, in a wide range of amplitude, frequency, phase can be obtained within a high degree of measurement accuracy.
3, belongs to the digital sensor, the secondary instrumentation will not introduce errors, sensor error is the system error.
Baidu Encyclopedia-Current Transformer