產(chǎn)品描述
通用電氣Multilin的UR-8FH是一種CT/VT模塊，設(shè)計用于安裝在通用繼電器系列中。該繼電器配有3個1A/5A相電流互感器、1A/5A地電流互感器和4個電壓互感器端子。電流互感器和電壓互感器能夠?qū)㈦娏骱碗妷航抵量晒芾淼乃?，用于繼電器的監(jiān)測和控制，并且是為繼電器產(chǎn)生重要數(shù)據(jù)所必需的。

CT/VT模塊可以在通道1到4或通道5到8上使用電壓或觸點輸入。UR手冊提供了有關(guān)適當(dāng)繼電器連接的進一步信息，指出了重要的細(xì)節(jié)，例如通道1和5如何連接到相A，通道2和6如何連接到相B等。手冊還向用戶提供了完整的警告和注意事項，例如，在標(biāo)稱電流為1a或5a時，如何連接到繼電器端子，必須與所連接的ct的次級額定值相匹配，以免用戶希望引起系統(tǒng)損壞?？傊陂_始進行繼電器連接之前，用戶仔細(xì)閱讀通用繼電器手冊是很重要的。

關(guān)于UR-8FH的常見問題
UR-8FH是否具有保護接地故障的能力，當(dāng)納入通用繼電器的GE Multilin系統(tǒng)時?
UR-8FH的CT/VT被描述為具有標(biāo)準(zhǔn)的4CT/4VT。它不具有敏感接地特性，這使得通用繼電器可以在高阻抗接地系統(tǒng)上進行保護。具有此特性的模塊有UR-8G、UR-8J、UR-8M和UR-8R訂單碼。這些提到的是新一代的CT/VT。有兩個較舊的CT/VT模塊(UR-8B和UR-8D)也具有敏感接地故障保護能力。例如，具有4CT/4VT功能的標(biāo)準(zhǔn)型號確實具有典型的多達(dá)24個模擬電流互感器和電壓互感器容量，所有CT/VT模塊都包含在各種通用繼電器中。除了CT/VT模塊外，通用繼電器還具有換能器I/O模塊。這為UR提供了DCmA卡或rtd來監(jiān)測流量，風(fēng)速，溫度，振動或壓力。模擬輸出也可用于將UR連接到外部PLC或其他用戶界面設(shè)備。通用繼電器也有一個數(shù)字I/O模塊，包含多達(dá)96個觸點輸入和多達(dá)64個觸點輸出。

UR8FH

Product description
General Electric Multilin’s UR-8FH is a CT/VT module designed to be installed in the general purpose relay family. The relay is equipped with three 1A/5A phase current transformers, 1A/5A ground current transformers and four voltage transformer terminals. Current transformers and voltage transformers are capable of reducing current and voltage to manageable levels, are used for monitoring and control of relays, and are necessary to generate important data for relays.

CT/VT modules can use voltage or contact inputs on channels 1 to 4 or channels 5 to 8. The UR manual provides further information on proper relay connections, pointing out important details such as how channels 1 and 5 are connected to phase A, how channels 2 and 6 are connected to phase B, etc. The manual also provides the user with complete warnings and precautions, for example, how to connect to the relay terminal when the nominal current is 1a or 5a, which must match the secondary rating of the connected ct, lest the user wish to cause damage to the system. In summary, it is important for users to read the general relay manual carefully before starting to connect relays.

Frequently Asked Questions about UR-8FH
Does the UR-8FH have the ability to protect against ground faults when incorporated into GE Multilin systems with universal relays?
The UR-8FH’s CT/VT is described as having a standard 4CT/4VT. It does not have sensitive ground characteristics, which allows general purpose relays to be protected on high impedance ground systems. Modules with this feature are UR-8G, UR-8J, UR-8M, and UR-8R order codes. These refer to a new generation of CT/VT. There are two older CT/VT modules (UR-8B and UR-8D) that also have sensitive ground fault protection capabilities. For example, standard models with 4CT/4VT capabilities do have typical capacities of up to 24 analog current transformers and voltage transformers, with all CT/VT modules included in various general-purpose relays. In addition to the CT/VT module, the universal relay also has a transducer I/O module. This provides the UR with a DCmA card or rtd to monitor flow, wind speed, temperature, vibration, or pressure. The analog output can also be used to connect the UR to an external PLC or other user interface device. Universal relays also have a digital I/O module containing up to 96 contact inputs and up to 64 contact outputs.

UR8FH