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UR6TH繼電保護(hù)器
操作原理4.1概述EMHP電源每相都連接有一個(gè)SCR模塊。這些模塊與點(diǎn)火電路和反饋回路（恒壓/恒流“或”電路）一起工作。反饋回路確定SCR的點(diǎn)火角，確保向電力變壓器的一次側(cè)施加調(diào)節(jié)的交流輸入電壓。然后，通過電力變壓器將該穩(wěn)壓交流電壓調(diào)節(jié)至適當(dāng)水平。經(jīng)過全波整流和濾波后，產(chǎn)生恒定的輸出電壓或電流。4.2功率流本節(jié)討論EMHP三相電源的功率和信號(hào)流的基本理論。如果用作第五節(jié)中提供的維護(hù)數(shù)據(jù)的補(bǔ)充，它將有助于隔離機(jī)組故障。閱讀本節(jié)時(shí)，請(qǐng)參考圖11，電源和信號(hào)流框圖以及示意圖#01-459-110和#01-142-000。對(duì)功率流的解釋如下：通電后，交流電通過RFI濾波器、SCR網(wǎng)絡(luò)的斷路器CB1、K1。SCR模塊每個(gè)模塊包含兩個(gè)反向并聯(lián)連接的SCR。每個(gè)可控硅在陰極（輸入交流電）同時(shí)施加負(fù)電壓和柵極引線同時(shí)施加正電壓時(shí)傳導(dǎo)。在正半周期Q2、Q4和Q6期間進(jìn)行，在負(fù)半周期Q1、Q3和Q5期間進(jìn)行。門信號(hào)必須在1-3伏之間，SCR才能啟動(dòng)。SCR的點(diǎn)火角決定了施加到輸入變壓器的交流功率。因此，在輸入循環(huán)早期觸發(fā)的SCR的直流輸出振幅提供了比在輸入循環(huán)后期觸發(fā)的更高的輸出。
SCR與點(diǎn)火電路一起工作控制應(yīng)用于電力變壓器T1一次側(cè)的交流功率。
該變壓器將輸入交流電壓轉(zhuǎn)換為負(fù)載電壓和電流的適當(dāng)交流電平。電壓通過T1二次側(cè)的整流器轉(zhuǎn)換為DC。在高持續(xù)負(fù)載電流下，L1平均濾波器輸入處的DC電壓波形。在低負(fù)載電流下，電感無(wú)效，電容器C22改變?yōu)榉逯得}沖幅度，以進(jìn)行必要的濾波。輸入波形的相位延遲在全額定輸出時(shí)約為60度，在低輸出電壓和電流時(shí)約為180度。電阻器R10用作預(yù)負(fù)載，以確保負(fù)載與電源斷開時(shí)的穩(wěn)定性。偏置變壓器T2有兩個(gè)二次繞組。每個(gè)變壓器上的端子4和6相對(duì)于中心抽頭端子5產(chǎn)生50V RMS。這提供了兩個(gè)相隔180度的正弦波信號(hào)，用于參考SCR點(diǎn)火電路的線頻率。每個(gè)變壓器的端子7和8之間產(chǎn)生20V RMS的電壓。它們的電壓在A100控制板上進(jìn)行全波整流，為控制電路提供+和-15V DC。信號(hào)流用于調(diào)節(jié)該電源的所有控制電路位于A100控制板示意圖#01-142-000上。信號(hào)流說(shuō)明如下：來(lái)自偏置變壓器T2的18-20伏交流電為A100控制盤的偏置部分提供三相輸入。這些輸入用于電源控制過程的不同方面。大多數(shù)電路使用由IC101和IC102調(diào)節(jié)的+15伏和-15伏直流電。IC101在150毫安負(fù)載下產(chǎn)生+15伏直流電，IC102在30毫安負(fù)載時(shí)產(chǎn)生-15伏負(fù)直流電。當(dāng)使用干觸點(diǎn)控制時(shí)，未調(diào)節(jié)的直流電壓用于遠(yuǎn)程接通的電壓。
PRINCIPLES OF OPERATION
4.1 GENERAL The EMHP power supply has a SCR module connected in each phase. These modules work in conjunction with the firing circuit and a feedback loop which is the constant voltage/constant current "ored" circuit. The feedback loop determines the firing angle of the SCRs, ensuring a regulated AC input voltage is applied to the primary of the power transformer. This regulated AC voltage is then adjusted to the proper level by the power transformer. After being full-wave rectified and filtered a constant output voltage or current is produced. 4.2 THE POWER FLOW This section discusses the basic theory of power and signal flow of the EMHP three phase power supply. If used as a supplement to the maintenance data provided in Section V, it will aid in isolation of unit faults. Refer to Figure 11, block diagram of power and signal flow plus schematics #01-459-110 and #01-142-000 when reading this section. Explanation of power flow is as follows: Upon applying power the AC passes through the RFI filter, circuit breaker CB1, K1 of the SCR networks. The SCR modules contain two SCRs per module, which are connected in reverse parallel. Each SCR conducts upon the simultaneous application of a negative voltage to its cathode (input AC) and a positive voltage to its gate lead. During the positive half cycle Q2, Q4 and Q6 is conducting and during the negative half cycle Q1, Q3 and Q5 will conduct. The gate signal must be from 1-3 volts for the SCR to fire. The firing angle of the SCR determines the amount of AC power applied to the input transformer. Thus the amplitude of the DC output of a SCR that is fired at an early point of the input cycle provides a higher output than one that is fired later in the input cycle.
The SCRs operating in conjunction with the firing circuits
controls the amount of AC power applied to the primary of power transformer T1. This transformer converts the input AC voltage to the appropriate AC level for the load voltage and current. The voltage is converted to DC by rectifiers on secondary side of T1. At a high continuous load current, L1 averages the DC voltage waveform at the input of the filter. At low load currents, the inductance is ineffective and capacitor C22 changes to peak pulse amplitude for necessary filtering. The phase delay of the input waveform ranges for approximately 60 degrees at the full rated output to nearly 180 degrees at low output voltage and current. Resistor R10 acts as a pre-load to assure stability when the load is disconnected from the power supply. The bias transformers T2 have two secondary windings. Terminals 4 and 6 on each transformer produces 50V RMS with respect to the center tap, terminal 5. This provides two sine wave signals spaced 180 degrees out of phase for referencing the SCR firing circuit to the line frequency. A voltage of 20V RMS is produced between terminals 7 and 8 of each transformer. Their voltages are full wave rectified on the A100 Control Board to provide + and -15V DC for control circuitry.SIGNAL FLOW All the controlling circuitry for regulation of this supply is located on the A100 Control Board schematic #01-142-000. Explanation of signal flow is as follows: The 18-20 volts AC from bias transformer T2 provides a three-phase input to the bias section of the A100 control board. These inputs are used for different facets of the controlling process of the power supply. Most of the circuitry use the + and -15 volts DC regulated by IC101 and IC102. IC101 produces a plus 15V DC with a 150 milliampere load and IC102 a minus 15VDC with a 30 milliampere load. The unregulated DC voltage is used for voltage with the remote turn-on when dry contact control is used.
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