First, the conditions of use: Unless otherwise specified, the transformer must meet the following operational conditions. Second, important notes: When performing the repeated power frequency withstand voltage test on the primary winding, it should be conducted at 80% of the specified test voltage. Third, usage instructions: 1. The old standard for current transformer protection accuracy (GB1208-75) used codes "C", "D", and "B" to represent "poor," "moving," and "protection." According to GB1208-87 and GB1208-97, the accuracy level for protection current transformers refers to the maximum allowable composite error at the rated accuracy limit primary current. It is followed by the letter "P," with standard levels being 5P and 10P. For example, 10P15 means that the composite error is less than 10% at 15 times the rated primary current.
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1. Ambient temperature:
For indoor environments, the temperature range is -5°C to 40°C. For outdoor models, it ranges from -35°C to 40°C, with a daily average not exceeding 30°C.
2. Altitude:
The maximum altitude allowed is 1000 meters. If used in high-altitude areas, select a model designed for plateau conditions.
3. Current transformers can operate continuously at 1.2 times their rated current.
4. Ungrounded voltage transformers may run at 1.2 times their rated voltage for long periods. Grounded voltage transformers are allowed to operate at 1.9 times their rated voltage for up to 8 hours.
Do not perform a power frequency withstand voltage test between the two primary terminals of the voltage transformer if the voltage exceeds the rated voltage factor, as this could damage the transformer.
For semi-insulated grounded voltage transformers, inductive withstand voltage tests should only be conducted when testing insulation between the primary and secondary windings and ground.
If a grounded voltage transformer is installed on a line, it must be removed during busbar-to-ground or busbar-to-busbar power frequency withstand voltage tests to prevent damage.
Fully insulated grounded and ungrounded voltage transformers can undergo power frequency withstand voltage tests during insulation testing between the primary and secondary windings and ground, but ensure that both primary terminals are securely connected before applying high voltage.
2. The winding used for grounding protection in voltage transformers was previously known as the "zero-sequence voltage coil." The correct standard is "3B" or "6B." Here, "3" and "6" indicate the error limits, while "B" stands for "protection." GB1207-1997 specifies that the accuracy level for protection voltage transformers is based on the maximum allowable voltage error within the voltage range corresponding to the rated voltage factor of 5%. It is followed by the letter "P," with standard accuracy levels being "3P" and "6P."
3. Current transformers can have measurement accuracy grades such as 0.5S or 0.2S, and the secondary current can be either 5A or 1A. If the accuracy grade changes or the secondary current is 1A, the technical parameters such as secondary output, rated dynamic, and thermal stable current may need adjustment and should be clearly stated in the order.