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1.3.2 ELECTRONIC RELEASES These releases are connected with current transformers (three or four according to the number of conductors to be protected), which are positioned inside the circuit-breaker and have the double functions of supplying the power necessary to the proper functioning of the release (self-supply) and of detecting the value of the current flowing inside the live conductors; therefore they are compatible with alternating current networks only. The signal coming from the transformers and from the Rogowsky coils is processed by the electronic component (microprocessor) which compares it with the set thresholds. When the signal exceeds the thresholds, the trip of the circuit-breaker is operated through an opening solenoid which directly acts on the circuit-breaker operating mechanism. In case of auxiliary power supply in addition to self-supply from the current transformers, the voltage shall be 24 Vdc ± 20%. Besides the standard protection functions, releases provide: - measuraments of currents (Ekip LSI/LSIG + Ekip COM, Ekip M LRIU + Ekip COM, PR222, PR232, PR331, PR121); - measurament of currents,voltage,frequency,power,energy,power factor (PR223,PR332,PR122) and moreover for PR333 and PR123, the measurement of harmonic distortions is available; - serial comunication with remote control for a complete management of the plant (Ekip LSI/LSIG + Ekip COM, Ekip M LRIU + Ekip COM, PR222, PR223, PR232, PR331, PR332, PR333, PR121, PR122, PR123). The following table shows the types of electronic trip units available for SACE Tmax XT, Tmax T and Emax circuit-breakers.
1.3.2電子版本
這些脫扣器與電流互感器（三個(gè)或四個(gè)）相連
要保護(hù)的導(dǎo)線數(shù)量），這些導(dǎo)線位于
斷路器和斷路器具有提供所需電源的雙重功能
確保釋放（自供）和檢測(cè)值的正常運(yùn)行
帶電導(dǎo)體內(nèi)部流動(dòng)的電流；因此它們是相容的
僅適用于交流電網(wǎng)。
來(lái)自變壓器和羅氏線圈的信號(hào)是
由比較它的電子元件（微處理器）處理
設(shè)定閾值。當(dāng)信號(hào)超過(guò)閾值時(shí)，控制器跳閘
斷路器通過(guò)直接作用于斷路器的分閘電磁閥進(jìn)行操作
斷路器操作機(jī)構(gòu)。
如果是輔助電源，除了來(lái)自電流的自供電
變壓器，電壓應(yīng)為24 Vdc±20%。
除了標(biāo)準(zhǔn)保護(hù)功能外，釋放還提供：
-電流測(cè)量（Ekip LSI/LSIG+Ekip COM、Ekip M LRIU+Ekip COM、，
PR222、PR232、PR331、PR121）；
-電流、電壓、頻率、功率、能量、功率因數(shù)的測(cè)量
（PR223、PR332、PR122）此外，對(duì)于PR333和PR123，可以測(cè)量諧波失真；
-通過(guò)遠(yuǎn)程控制進(jìn)行串行通信，實(shí)現(xiàn)對(duì)
工廠（Ekip LSI/LSIG+Ekip COM、Ekip M LRIU+Ekip COM、PR222、，
PR223、PR232、PR331、PR332、PR333、PR121、PR122、PR123）。
下表顯示了可供選擇的電子脫扣器類(lèi)型
SACE Tmax XT、Tmax T和Emax斷路器。
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