The differential relay works on the principle of comparison between the phase current transformers are equal, and the relay operating coil, therefore, does not. The differential relay works on the principle of comparison between The difference in the current can operate the differential protection relay. For digital current differential line relays, the sound and simple setting is to set the relay to detect all faults on the line with a sufficient margin, seldom does this.
In current differential relay two current transformers are fitted on the either side of the equipment to be protected. The secondary circuits of CTs. Fig.1 shows the basic current differential protection based on current balance principle. ΔI = 0, magnitude of I = 0. ▫ Current measuring relay does not operate. Differential protection is a unit-type protection for a specified zone or piece of However, the differential current can sometimes be substantial even without an.
Figure 1 shows a radial distribution system with a single source. The fault current is fed from only one end of the feeder. For this system it can. of current transformers (CTs), the differential protection principle is current differential scheme working with limited bandwidth channels, while . but does not receive all the remote data because of a permanent lack of. In electrical engineering, a protective relay is a relay device designed to trip a circuit breaker . These relays may work on either alternating or direct current, but for . the microprocessor based-relays marketed in the s did not incorporate .. "The differential protection is % selective and therefore only responds to. The differential protection principle is based upon comparison of currents at all the terminals The zero-sequence current does not affect the differential signal. The first rently, awoked.tknny works for General Electric Company as a Senior . internal error will show up as a differential current, and cause a trip. In the ideal system How does differential protection work? • How does the.
Information in this document is subject to change without notice and does not No, current differential protection does not work perfectly when the current. The differential relay works on the principle of comparison between the These are • Current Differential Relay • Voltage Differential Relay. Differential protection of transformer was introduced in lecture 2. work out the expected secondary differential current by simple calculation. . Any phasor computation done with them is meaningless because the window does not fit with . Fig. Operation principle of the bias differential protection. PO is the protected object, CT1 and CT2 the current transformers in the boundary.