產(chǎn)品細(xì)節(jié)介紹
3BHE023584R2625控制模塊
當(dāng)相電流低于CT的5%時(shí)，369檢測(cè)到停止的電機(jī)狀態(tài)，當(dāng)在停止的電機(jī)狀況后檢測(cè)到相電流時(shí)，則檢測(cè)到啟動(dòng)電機(jī)狀態(tài)。如果電機(jī)以5%的電流互感器空轉(zhuǎn)，幾次啟動(dòng)和停止如果啟動(dòng)/小時(shí)、啟動(dòng)之間的時(shí)間、重新啟動(dòng)阻止、啟動(dòng)禁止或反向旋轉(zhuǎn)，則可能會(huì)檢測(cè)到導(dǎo)致滋擾鎖定定時(shí)器已編程。此外，學(xué)習(xí)值（如學(xué)習(xí)的啟動(dòng)熱容量、學(xué)習(xí)的啟動(dòng)電流和學(xué)習(xí)的加速時(shí)間）也可能計(jì)算不正確。為了克服這一潛在問題，可以配置備用數(shù)字輸入，以讀取斷路器的狀態(tài)，并確定電機(jī)是停止運(yùn)行還是只是空轉(zhuǎn)。備用輸入配置為啟動(dòng)機(jī)狀態(tài)，斷路器輔助觸點(diǎn)連接在備用輸入端子上，369僅在相位電流低于CT的5%（或零），斷路器斷開。如果這兩個(gè)條件都不滿足，369將繼續(xù)以電機(jī)運(yùn)行且啟動(dòng)元件保持不變的方式運(yùn)行。有關(guān)的詳細(xì)信息，請(qǐng)參閱下面的流程圖
369如何檢測(cè)電機(jī)狀態(tài)以及啟動(dòng)器狀態(tài)元素如何進(jìn)一步定義電機(jī)的狀態(tài)。
當(dāng)對(duì)Starter Status（起動(dòng)機(jī)狀態(tài)）進(jìn)行編程時(shí)，必須設(shè)置用于監(jiān)控的斷路器觸點(diǎn)類型。
以下內(nèi)容是斷路器輔助觸點(diǎn)相對(duì)于斷路器的狀態(tài)：
?52a、52aa-斷路器觸點(diǎn)打開時(shí)打開，斷路器觸點(diǎn)閉合時(shí)關(guān)閉
?52b、52bb-斷路器觸點(diǎn)斷開時(shí)閉合，斷路器觸點(diǎn)閉合時(shí)斷開，冷卻時(shí)間常數(shù)選擇
熱限值不是一門黑白科學(xué)，設(shè)置保護(hù)繼電器熱模型有一些藝術(shù)。熱極限的定義對(duì)不同的制造商來說意味著不同的事情，而且通常信息不可用。因此，重要的是要記住電機(jī)保護(hù)熱建模的目標(biāo)是什么：對(duì)電機(jī)進(jìn)行熱保護(hù)（轉(zhuǎn)子和定子），而不會(huì)妨礙電機(jī)的正常和預(yù)期運(yùn)行條件。
369的熱模型提供了集成的轉(zhuǎn)子和定子加熱保護(hù)。如果提供冷卻時(shí)間常數(shù)應(yīng)使用電機(jī)數(shù)據(jù)。由于轉(zhuǎn)子和定子加熱和冷卻集成在一個(gè)模型中，使用較長的冷卻時(shí)間常數(shù)（轉(zhuǎn)子或定子）。
但是，如果沒有提供冷卻時(shí)間常數(shù)，則必須確定設(shè)置。在確定冷卻時(shí)間之前恒定設(shè)置時(shí)，應(yīng)考慮電機(jī)的占空比。如果電機(jī)通常啟動(dòng)并連續(xù)運(yùn)行很長一段時(shí)間沒有過載負(fù)載要求，冷卻時(shí)間常數(shù)可能很大。這將使熱模型保守。如果電機(jī)的正常占空比涉及頻繁啟動(dòng)和停止，且有周期性過載占空比要求，則冷卻時(shí)間常數(shù)需要更短，并接近電機(jī)的實(shí)際熱極限。
正常情況下，電機(jī)在啟動(dòng)期間受到轉(zhuǎn)子限制。
因此，定子中的RTD不能提供最佳的確定方法涼爽的時(shí)候。確定運(yùn)行和停止冷卻時(shí)間常數(shù)的合理設(shè)置可以在按優(yōu)先順序列出的下列方式之一。
1.電機(jī)數(shù)據(jù)表或制造商（如有要求）上可提供電機(jī)運(yùn)行和停止冷卻時(shí)間或常數(shù)。記住冷卻是指數(shù)的，時(shí)間常數(shù)是總時(shí)間的五分之一從100%的熱容量到0%。
2.嘗試根據(jù)電機(jī)的可用數(shù)據(jù)確定保守值。有關(guān)詳細(xì)信息，請(qǐng)參見以下示例。
3.如果沒有可用的數(shù)據(jù)，必須進(jìn)行有根據(jù)的猜測(cè)。也許電機(jī)數(shù)據(jù)可以通過其他電機(jī)進(jìn)行估算類似大小或用途的。請(qǐng)注意，在更好地理解制定了電機(jī)要求。記住，目標(biāo)是在不妨礙操作的情況下保護(hù)電機(jī)這是我們所期望的。
MOTOR STATUS DETECTION
The 369 detects a stopped motor condition when the phase current falls below 5% of CT, and detects a starting motor condition when phase current is sensed after a stopped motor condition. If the motor idles at 5% of CT, several starts and stops can be detected causing nuisance lockouts if Starts/Hour, Time Between Starts, Restart Block, Start Inhibit, or Backspin Timer are programmed. As well, the learned values, such as the Learned Starting Thermal Capacity, Learned Starting Current and Learned Acceleration time can be incorrectly calculated. To overcome this potential problem, the Spare Digital Input can be configured to read the status of the breaker and determine whether the motor is stopped or simply idling. With the spare input configured as Starter Status and the breaker auxiliary contacts wired across the spare input terminals, the 369 senses a stopped motor condition only when the phase current is below 5% of CT (or zero) AND the breaker is open. If both of these conditions are not met, the 369 will continue to operate as if the motor is running and the starting elements remain unchanged. Refer to the flowchart below for details of how the 369 detects motor status and how the starter status element further defines the condition of the motor. When the Starter Status is programmed, the type of breaker contact being used for monitoring must be set. The following are the states of the breaker auxiliary contacts in relation to the breaker: ? 52a, 52aa - open when the breaker contacts are open and closed when the breaker contacts are closed ? 52b, 52bb - closed when the breaker contacts are open and open when the breaker contacts are closed
SELECTION OF COOL TIME CONSTANTS
Thermal limits are not a black and white science and there is some art to setting a protective relay thermal model. The definition of thermal limits mean different things to different manufacturers and quite often, information is not available. Therefore, it is important to remember what the goal of the motor protection thermal modeling is: to thermally protect the motor (rotor and stator) without impeding the normal and expected operating conditions that the motor will be subject to. The thermal model of the 369 provides integrated rotor and stator heating protection. If cooling time constants are supplied with the motor data they should be used. Since the rotor and stator heating and cooling is integrated into a single model, use the longer of the cooling time constants (rotor or stator). If however, no cooling time constants are provided, settings will have to be determined. Before determining the cool time constant settings, the duty cycle of the motor should be considered. If the motor is typically started and run continuously for very long periods of time with no overload duty requirements, the cooling time constants can be large. This would make the thermal model conservative. If the normal duty cycle of the motor involves frequent starts and stops with a periodic overload duty requirement, the cooling time constants will need to be shorter and closer to the actual thermal limit of the motor. Normally motors are rotor limited during starting. Thus RTDs in the stator do not provide the best method of determining cool times. Determination of reasonable settings for the running and stopped cool time constants can be accomplished in one of the following manners listed in order of preference. 1. The motor running and stopped cool times or constants may be provided on the motor data sheets or by the manufacturer if requested. Remember that the cooling is exponential and the time constants are one fifth the total time to go from 100% thermal capacity used to 0%. 2. Attempt to determine a conservative value from available data on the motor. See the following example for details. 3. If no data is available an educated guess must be made. Perhaps the motor data could be estimated from other motors of a similar size or use. Note that conservative protection is better as a first choice until a better understanding of the motor requirements is developed. Remember that the goal is to protect the motor without impeding the operating duty that is desired.
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PLC可編程控制器模塊，DCS卡件，ESD系統(tǒng)卡件，振動(dòng)監(jiān)測(cè)系統(tǒng)卡件，汽輪機(jī)控制系統(tǒng)模塊，燃?xì)獍l(fā)電機(jī)備件等，優(yōu)勢(shì)品牌：Allen Bradley、BentlyNevada、ABB、Emerson Ovation、Honeywell DCS、Rockwell ICS Triplex、FOXBORO、Schneider PLC、GE Fanuc、Motorola、HIMA、TRICONEX、Prosoft等各種進(jìn)口工業(yè)零部件、歐美進(jìn)口模塊。
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