The aggregate schematic wiring diagram (referred to as schematic diagram) represents relays and various electrical appliances in the form of an integrated whole, using straight lines to show their interconnections, which can clearly and vividly illustrate the wiring and operating principles of relay protection, signal systems, and operation control.
The characteristics of the aggregate schematic wiring diagram are as follows:
(1) Thick lines are used to represent the equipment of the primary system and their connections, while DC circuits are drawn with thin lines for distinction.
(2) If the specifications of the main equipment in the primary circuit are known, such as transformers should be noted with concise specifications, busbars should be noted with rated voltage, and current transformers should be noted with transformation ratio, polarity, and group codes. The wiring method of the primary equipment is drawn according to the normal energized operating state.
(3) Relays in the secondary circuit are represented in the form of an integrated whole, that is, the coil and contacts of a relay are drawn together. The aggregate schematic wiring diagram also includes test terminals, connecting pieces, additional resistors, buttons, control switches, red and green indicator lights, and all trip and close wiring circuits of the operating mechanism.
(4) Control switches and complex relays should be marked with internal terminal numbers. Special relays and relays that need modification should be explained in the remarks column.
(5) The positive pole of the DC operating power supply is connected to the relay contacts, and the negative pole is connected to the circuit breaker or signal relay operating coil. The neutral wire of the current test terminal should be grounded. For the convenience of calibration, it is grounded on the relay protection panel.
(6) All relays and other electrical appliances in the secondary circuit should be numbered for easy reference.
