描述

1762-OW16 瓦斯繼電器的引出線應采用防油線或塑料線

1?使用安全措施

長期以來，瓦斯保護正確動作率低于變壓器其他保護裝置的平均水平，為提高瓦斯保護的安全可靠性，除改進瓦斯繼電器的結構以外，需要執(zhí)行以下安全技術措施。

變壓器應有1%～1.5%的坡度。通往繼電器的油管應有２%～４%的坡度，油枕處較高，使氣體易流入瓦斯繼電器

瓦斯繼電器的引出線應采用防油線或塑料線，經(jīng)過中間接線盒，通過端子排和電纜連接，電纜和引出線應分別連接在接線盒內(nèi)端子排的兩側，引出線從端子排下方接入電纜從端子排上方引出，這樣接線是為了避免由于油的毛細管現(xiàn)象引起對電纜的腐蝕。此外還應注意，引線排列要使重瓦斯接點和直流電源正極隔開，中間端子盒不要安置在油管和油枕下面，以防油管和油枕漏油滲入端子盒。

防止瓦斯繼電器接點引出線因漏水短路，瓦斯繼電器的端蓋部分和電纜引出線的小端子箱應有密封措施，以防止雨水浸入造成誤動作。

瓦斯繼電器的出口中間繼電器應帶自保持線圈，以防止變壓器內(nèi)部嚴重故障時油速不穩(wěn)定，造成瓦斯接點時通時斷而不能可靠跳閘。

變壓器的呼吸器必須保持通暢，變壓器投入之前，必須檢查吸濕器下部的透氣孔是否開啟。運行中也應檢查吸濕器的透氣情況，以防止變壓器油溫變化時，因透氣孔閉塞造成呼吸器或油枕真空或壓力升高，使瓦斯繼電器誤動作。

瓦斯繼電器和儲油柜間的連接閥門運行時應打開，為防止檢修后遺忘開啟，造成瓦斯誤動作，閥門應加鉛封。

變壓器運行時，重瓦斯應接入跳閘，輕瓦斯投入信號。備用變壓器的瓦斯應投入信號，以便監(jiān)視油面。備用的單臺變壓器應斷開跳閘電源。當一臺斷路器控制兩臺變壓器時，若其中一臺轉為備用，應將其重瓦斯改接信號。

變壓器在運行中進行濾油、加油、換硅膠或在散熱器、潛油泵檢修后投入前，應先將重瓦斯接信號，待空氣排盡后，方可將重瓦斯投入跳閘位置。

當油位計上指示的油面有異常升高或油路系統(tǒng)有異?，F(xiàn)象時，為查明原因，需要打開各個放氣或放油塞子、閥門，檢查吸濕器，或在進行其他工作時必須先將重瓦斯改接至信號，然后才能開展工作，以防瓦斯保護誤動作跳閘。

2?瓦斯保護信號動作的主要原因

若瓦斯保護動作，變壓器開關跳閘，一般情況下，其事故過程已結束，后果比較嚴重。因此，必須在瓦斯信號動作時，認真檢查，仔細分析，正確判斷，立即采取措施。變壓器瓦斯繼電器有浮筒式、擋板式、開口杯式等不同型號，目前大多采用QJ-80型瓦斯繼電器，其信號回路接上開口杯，跳閘回路接下?lián)醢?。所謂瓦斯保護信號動作，是指因各種原因造成繼電器內(nèi)上開口杯的信號回路接點閉合，輕瓦斯動作。接點閉合的原因一般有以下幾方面。

1762-OW16 瓦斯繼電器的引出線應采用防油線或塑料線

1 Use safety measures

For a long time, the correct operation rate of gas protection is lower than the average level of other transformer protection devices, in order to improve the safety and reliability of gas protection, in addition to improving the structure of gas relays, the following safety technical measures need to be implemented.

The transformer should have a slope of 1% to 1.5%. The oil pipe leading to the relay should have a slope of 2% to 4%, and the oil pillow is high, so that the gas is easy to flow into the gas relay

The outgoing cable of the gas relay should be oil-proof or plastic, and connected to the cable through the terminal block through the intermediate terminal box. The cable and the outgoing cable should be connected to both sides of the terminal block in the terminal box, and the outgoing cable should be connected from below the terminal block to the cable from above the terminal block. This connection is to avoid the corrosion of the cable caused by the capillary phenomenon of oil. In addition, it should be noted that the lead arrangement should be separated from the heavy gas contact and the positive DC power supply, and the middle terminal box should not be placed under the oil pipe and oil pillow to prevent oil leakage into the terminal box.

To prevent short circuit of the gas relay contact outlet line due to water leakage, the end cover part of the gas relay and the small terminal box of the cable outlet line should be sealed to prevent misoperation caused by rainwater immersion.

The outlet intermediate relay of the gas relay should be equipped with a self-holding coil to prevent the oil speed from being unstable when the transformer is in serious internal fault, resulting in the gas contact being on and off and unable to reliably trip.

The transformer respirator must be kept open, and before the transformer is put in, it must be checked that the ventilation hole under the moisture absorber is open. During operation, the air permeability of the moisture absorber should also be checked to prevent the vacuum or pressure rise of the breathing apparatus or oil pillow due to the occlusion of the air vent when the oil temperature of the transformer changes, causing the gas relay to operate incorrectly.

The connecting valve between the gas relay and the oil storage tank should be opened during operation. In order to prevent the forgotten opening after maintenance, causing gas misoperation, the valve should be sealed with lead.

When the transformer is running, heavy gas should be connected to tripping and light gas input signal. The gas of the backup transformer should be put into the signal to monitor the oil level. The spare single transformer should be disconnected from the trip power supply. When a circuit breaker controls two transformers, if one of them is switched to standby, its heavy gas should be switched to signal.

Before the transformer is put into operation after oil filtering, refueling, changing silica gel or after the repair of the radiator and submersible oil pump, the heavy gas should be connected to the signal first, and the heavy gas can be put into the tripping position after the air is exhausted.

When there is an abnormal rise in the oil level indicated on the oil level gauge or an abnormal phenomenon in the oil circuit system, in order to find out the cause, it is necessary to open each gas or oil drain plug, valve, check the moisture absorber, or in other work must first change the heavy gas to the signal, and then work to prevent the gas protection from misoperation and tripping.

2 Main reasons for gas protection signal action

If the gas protection action, the transformer switch trip, under normal circumstances, the accident process has ended, the consequences are more serious. Therefore, it is necessary to carefully check, carefully analyze, correctly judge and take immediate measures when the gas signal is in action. There are different types of transformer gas relays, such as float type, baffle type and open-cup type. At present, most of them use QJ-80 type gas relays, whose signal circuit is connected to the open-cup and the tripping circuit takes over the baffle. The so-called gas protection signal action refers to the signal circuit contact of the upper open cup in the relay that is closed and the light gas action is caused by various reasons. The reasons for contact closure generally have the following aspects.

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Chengdu Sunshine Xihe Co., Ltd. specializes in one-stop procurement consulting for imported industrial spare parts, offering original equipment and professional discontinued parts services. We are committed to providing efficient and reliable automation solutions for our customers. Customer support fast responseThe network of partners spans all continentsGlobal partner networkAlways achieve more delivery, be it parts, service or speed



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