【正文】 Basic distance protection function is generally suitable for use in nonpensated works. A special addition to the basic functions is available optionally for use on series pensated and adjacent lines where voltage reversals might disturb the correct directional discrimination of a basic distance protection. 距離保護（ ZM） ? 距離保護段可以帶方向模式（正方向或反方向）或不帶方向模式，彼此獨立地動作，對復雜網(wǎng)絡結(jié)構(gòu)的電力線路、電纜線路的保護，如雙回線、平行線、多端線等，這種特性與不同的通信方案組合在一起使其適宜上述情形。 selection logic (PHS) ? Application The PHS is an independent measuring function. It prises both impedance and currentbased measurement criteria. Its main purpose is to augment the phase selectivity of the plete distance protection in works with long and heavily loaded lines. It is generally intended for use in directly earthed works, where correct and reliable phase selection for singlephase faults, bined with singlepole tripping and automatic reclosing, secures the stability of plete power systems. 選相邏輯（ PHS） ? PHS選相邏輯功能為一獨立的測量功能，它由阻抗測量判別與電流測量判別組成。獨立的選相與每個故障回路的方向測量組合在一起，也確保平行線近端同時故障有選擇性地動作。自動重合閘功能 AR的主要用途是在線路發(fā)生故障跳閘斷開后使電力線路自動恢復運行。 ? 尤其對高壓系統(tǒng)，大多數(shù)線路故障為單相接地故障，三相短路很少。s Relay Protection ? 電力系統(tǒng)元件保護原理 Protection Principle of Power System 39。這一點對保持有限線路聯(lián)絡的網(wǎng)狀形或平行線連接的系統(tǒng)的穩(wěn)定特別有利。某一終端內(nèi)實際 AR功能塊數(shù)量與終端的類型有關。 Autorecloser(AR) ? The majority of power line faults are transient in nature, . they do not recur when the line is reenergized following disconnection. The main purpose of the AR automatic reclosing function is to automatically return power lines to service following their disconnection for fault conditions. ? To meet the different single, double or 1 and 189。在這樣的網(wǎng)絡中，單相接地故障的正確可靠選相，與單相跳閘、自動重合閘組合在一起保證整個系統(tǒng)的穩(wěn)定。 ? 基本距離保護功能通常適用于用在非補償網(wǎng)絡中。 3. Distance protection (ZM) ? Phasetoearth distance protection serves as basic earth fault protection in works with directly or low impedance earthed works. Together with an independent phase preference logic, it also serves as selective protection function at crosscountry faults in isolated or resonantly earthed works. ? Independent reactive reach setting for phasetophase and for phasetoearth measurement secures high selectivity in works with different protective relays used for short circuit and earthfault protection. 距離保護（ ZM） ?相 — 地距離保護在直接接地或低阻抗接地網(wǎng)絡中可作為基本的接地保護功能，加上一個獨立的選相邏輯，也可作為隔離接地或諧振接地網(wǎng)絡中跨區(qū)域故障的選擇性保護功能。 3. Distance protection (ZM) Application ? The ZM distance protection function provides fast and reliable protection for overhead lines and power cables in all kinds of power works. For each independent distance protection zone, full scheme design provides continuous measurement of impedance separately in three independent phasetophase measuring loops as well as in three independent phasetoearth measuring loops. ? Phasetophase distance protection is suitable as a basic protection function against two and threephases faults in all kinds of works, regardless of the treatment of the neutral point. Independent setting of the reach in the reactive and the resistive direction for each zone separately, makes it possible to create fast and selective short circuit protection in power systems. 距離保護（ ZM） ? ZM距離保護功能對各種電網(wǎng)中的架空線路及電力電纜提供快速、可靠的保護。 2. Breaker failure protection ? An additional timer t1 for retrip mand is available. Dedicated setting allows to enable or disable the retrip or to perform it by current check or not. Retrip to the faulty circuit breaker can be issued single phase or three phases. ? Special adaptive algorithm (ASD), together with RMS measurement, allow a fast resetting time of the current me