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這種協(xié)調(diào)是通過雙方之間的對(duì)話來實(shí)現(xiàn)的
電流測(cè)量裝置，當(dāng)其確定設(shè)置閾值時(shí)
已超過，請(qǐng)正確識(shí)別并僅斷開
受斷層影響的區(qū)域。
實(shí)際上，它可以通過兩種方式實(shí)現(xiàn)：
•脫扣器發(fā)送已設(shè)定的預(yù)設(shè)電流閾值信息
超過監(jiān)管系統(tǒng)，由監(jiān)管系統(tǒng)決定采取何種保護(hù)措施
裝置必須跳閘；
•如果電流值超過其設(shè)定閾值，每個(gè)保護(hù)
裝置通過直接連接或總線向保護(hù)裝置發(fā)送閉鎖信號(hào)
層次結(jié)構(gòu)中較高的設(shè)備（即相對(duì)于
功率流），并在跳閘之前，確保類似的閉鎖信號(hào)
未從保護(hù)裝置下游到達(dá)；這樣，只有
緊接故障上游的保護(hù)裝置跳閘。
一種模式預(yù)計(jì)跳閘時(shí)間約為1秒，主要用于
在短路電流不特別高的情況下，功率流
未定義。
二種模式使跳閘時(shí)間明顯縮短：相對(duì)于
時(shí)間歧視協(xié)調(diào)，不再需要增加
當(dāng)我們靠近電源時(shí)，故意延時(shí)會(huì)逐漸增加
供給大延遲與檢測(cè)任何
存在從保護(hù)裝置下游發(fā)送的阻塞信號(hào)。
優(yōu)勢(shì)：
•減少跳閘次數(shù)，提高安全水平；
•減少故障和干擾造成的損害
在供電網(wǎng)絡(luò)中；
•減少斷路器和斷路器上的熱應(yīng)力和動(dòng)態(tài)應(yīng)力
系統(tǒng)的組件；
•大量歧視級(jí)別；
•保護(hù)冗余：在區(qū)域識(shí)別故障的情況下
跳閘由其他保護(hù)功能的設(shè)置確保
斷路器。特別是，可以調(diào)整延時(shí)保護(hù)
隨著時(shí)間值的增加，抗短路功能越接近
網(wǎng)絡(luò)饋線。
type of coordination is implemented by means of a dialogue between current measuring devices that, when they ascertain that a setting threshold has been exceeded, give the correct identification and disconnection only of the zone affected by the fault. In practice, it can be implemented in two ways: • the releases send information on the preset current threshold that has been exceeded to the supervisor system and the latter decides which protective device has to trip; • in the event of current values exceeding its setting threshold, each protective device sends a blocking signal via a direct connection or bus to the protective device higher in the hierarchy (i.e. upstream with respect to the direction of the power flow) and, before it trips, it makes sure that a similar blocking signal has not arrived from the protective device downstream; in this way, only the protective device immediately upstream of the fault trips. The first mode foresees tripping times of about one second and is used mainly in the case of not particularly high short-circuit currents where a power flow is not uniquely defined. The second mode enables distinctly shorter tripping times: with respect to a time discrimination coordination, there is no longer any need to increase the intentional time delay progressively as we move closer to the source of the power supply. The maximum delay is in relation to the time necessary to detect any presence of a blocking signal sent from the protective device downstream. Advantages: • reduction of the tripping times and increase of the safety level; • reduction of both the damages caused by the fault as well of the disturbances in the power supply network; • reduction of the thermal and dynamic stresses on the circuit-breakers and on the components of the system; • large number of discrimination levels; • redundancy of protections: in case of malfunction of zone discrimination, the tripping is ensured by the settings of the other protection functions of the circuit-breakers. In particular, it is possible to adjust the time-delay protection functions against short-circuit at increasing time values, the closer they are to the network’s feeder.
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